Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2 | /* pngwutil.c - utilities to write a PNG file |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
John Bowler | 9c04f57 | 2016-06-19 18:01:33 -0500 | [diff] [blame] | 4 | * Last changed in libpng 1.6.24 [(PENDING RELEASE)] |
Glenn Randers-Pehrson | ac43a87 | 2016-05-25 22:41:46 -0500 | [diff] [blame] | 5 | * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 9 | * This code is released under the libpng license. |
Glenn Randers-Pehrson | c332bbc | 2009-06-25 13:43:50 -0500 | [diff] [blame] | 10 | * For conditions of distribution and use, see the disclaimer |
Glenn Randers-Pehrson | 037023b | 2009-06-24 10:27:36 -0500 | [diff] [blame] | 11 | * and license in png.h |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 12 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 13 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 14 | #include "pngpriv.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 15 | |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 16 | #ifdef PNG_WRITE_SUPPORTED |
| 17 | |
Glenn Randers-Pehrson | 34713ce | 2010-04-28 07:49:28 -0500 | [diff] [blame] | 18 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 19 | /* Place a 32-bit number into a buffer in PNG byte order. We work |
| 20 | * with unsigned numbers for convenience, although one supported |
| 21 | * ancillary chunk uses signed (two's complement) numbers. |
| 22 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 23 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 24 | png_save_uint_32(png_bytep buf, png_uint_32 i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 25 | { |
Glenn Randers-Pehrson | baf301d | 2016-02-13 12:01:35 -0600 | [diff] [blame] | 26 | buf[0] = (png_byte)((i >> 24) & 0xffU); |
| 27 | buf[1] = (png_byte)((i >> 16) & 0xffU); |
| 28 | buf[2] = (png_byte)((i >> 8) & 0xffU); |
| 29 | buf[3] = (png_byte)( i & 0xffU); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 30 | } |
| 31 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 32 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 33 | * The parameter is declared unsigned int, not png_uint_16, |
| 34 | * just to avoid potential problems on pre-ANSI C compilers. |
| 35 | */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 36 | void PNGAPI |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 37 | png_save_uint_16(png_bytep buf, unsigned int i) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 38 | { |
Glenn Randers-Pehrson | baf301d | 2016-02-13 12:01:35 -0600 | [diff] [blame] | 39 | buf[0] = (png_byte)((i >> 8) & 0xffU); |
| 40 | buf[1] = (png_byte)( i & 0xffU); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 41 | } |
Glenn Randers-Pehrson | 34713ce | 2010-04-28 07:49:28 -0500 | [diff] [blame] | 42 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 43 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 44 | /* Simple function to write the signature. If we have already written |
| 45 | * the magic bytes of the signature, or more likely, the PNG stream is |
| 46 | * being embedded into another stream and doesn't need its own signature, |
| 47 | * we should call png_set_sig_bytes() to tell libpng how many of the |
| 48 | * bytes have already been written. |
| 49 | */ |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 50 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 51 | png_write_sig(png_structrp png_ptr) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 52 | { |
| 53 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 54 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 55 | #ifdef PNG_IO_STATE_SUPPORTED |
| 56 | /* Inform the I/O callback that the signature is being written */ |
| 57 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE; |
| 58 | #endif |
| 59 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 60 | /* Write the rest of the 8 byte signature */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 61 | png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 62 | (png_size_t)(8 - png_ptr->sig_bytes)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 63 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 64 | if (png_ptr->sig_bytes < 3) |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 65 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 66 | } |
| 67 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 68 | /* Write the start of a PNG chunk. The type is the chunk type. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 69 | * The total_length is the sum of the lengths of all the data you will be |
| 70 | * passing in png_write_chunk_data(). |
| 71 | */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 72 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 73 | png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 74 | png_uint_32 length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 75 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 76 | png_byte buf[8]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 77 | |
Glenn Randers-Pehrson | 5b3b54e | 2011-10-12 06:36:56 -0500 | [diff] [blame] | 78 | #if defined(PNG_DEBUG) && (PNG_DEBUG > 0) |
Glenn Randers-Pehrson | ba55c07 | 2011-10-11 21:21:37 -0500 | [diff] [blame] | 79 | PNG_CSTRING_FROM_CHUNK(buf, chunk_name); |
| 80 | png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length); |
| 81 | #endif |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 82 | |
| 83 | if (png_ptr == NULL) |
| 84 | return; |
| 85 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 86 | #ifdef PNG_IO_STATE_SUPPORTED |
| 87 | /* Inform the I/O callback that the chunk header is being written. |
| 88 | * PNG_IO_CHUNK_HDR requires a single I/O call. |
| 89 | */ |
| 90 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR; |
| 91 | #endif |
| 92 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 93 | /* Write the length and the chunk name */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 94 | png_save_uint_32(buf, length); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 95 | png_save_uint_32(buf + 4, chunk_name); |
| 96 | png_write_data(png_ptr, buf, 8); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 97 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 98 | /* Put the chunk name into png_ptr->chunk_name */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 99 | png_ptr->chunk_name = chunk_name; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 100 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 101 | /* Reset the crc and run it over the chunk name */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 102 | png_reset_crc(png_ptr); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 103 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 104 | png_calculate_crc(png_ptr, buf + 4, 4); |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 105 | |
| 106 | #ifdef PNG_IO_STATE_SUPPORTED |
| 107 | /* Inform the I/O callback that chunk data will (possibly) be written. |
| 108 | * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. |
| 109 | */ |
| 110 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA; |
| 111 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 112 | } |
| 113 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 114 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 115 | png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 116 | png_uint_32 length) |
| 117 | { |
| 118 | png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length); |
| 119 | } |
| 120 | |
| 121 | /* Write the data of a PNG chunk started with png_write_chunk_header(). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 122 | * Note that multiple calls to this function are allowed, and that the |
| 123 | * sum of the lengths from these calls *must* add up to the total_length |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 124 | * given to png_write_chunk_header(). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 125 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 126 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 127 | png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 128 | png_size_t length) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 129 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 130 | /* Write the data, and run the CRC over it */ |
| 131 | if (png_ptr == NULL) |
| 132 | return; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 133 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 134 | if (data != NULL && length > 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 135 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 136 | png_write_data(png_ptr, data, length); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 137 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 138 | /* Update the CRC after writing the data, |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 139 | * in case the user I/O routine alters it. |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 140 | */ |
| 141 | png_calculate_crc(png_ptr, data, length); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 142 | } |
| 143 | } |
| 144 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 145 | /* Finish a chunk started with png_write_chunk_header(). */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 146 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 147 | png_write_chunk_end(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 148 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 149 | png_byte buf[4]; |
| 150 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 151 | if (png_ptr == NULL) return; |
| 152 | |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 153 | #ifdef PNG_IO_STATE_SUPPORTED |
| 154 | /* Inform the I/O callback that the chunk CRC is being written. |
| 155 | * PNG_IO_CHUNK_CRC requires a single I/O function call. |
| 156 | */ |
| 157 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC; |
| 158 | #endif |
| 159 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 160 | /* Write the crc in a single operation */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 161 | png_save_uint_32(buf, png_ptr->crc); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 162 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 163 | png_write_data(png_ptr, buf, (png_size_t)4); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 164 | } |
| 165 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 166 | /* Write a PNG chunk all at once. The type is an array of ASCII characters |
| 167 | * representing the chunk name. The array must be at least 4 bytes in |
| 168 | * length, and does not need to be null terminated. To be safe, pass the |
| 169 | * pre-defined chunk names here, and if you need a new one, define it |
| 170 | * where the others are defined. The length is the length of the data. |
| 171 | * All the data must be present. If that is not possible, use the |
| 172 | * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
| 173 | * functions instead. |
| 174 | */ |
| 175 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 176 | png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 177 | png_const_bytep data, png_size_t length) |
| 178 | { |
| 179 | if (png_ptr == NULL) |
| 180 | return; |
| 181 | |
Glenn Randers-Pehrson | 8b83ff3 | 2015-08-13 20:57:18 -0500 | [diff] [blame] | 182 | /* On 64-bit architectures 'length' may not fit in a png_uint_32. */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 183 | if (length > PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 184 | png_error(png_ptr, "length exceeds PNG maximum"); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 185 | |
| 186 | png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length); |
| 187 | png_write_chunk_data(png_ptr, data, length); |
| 188 | png_write_chunk_end(png_ptr); |
| 189 | } |
| 190 | |
| 191 | /* This is the API that calls the internal function above. */ |
| 192 | void PNGAPI |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 193 | png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 194 | png_const_bytep data, png_size_t length) |
| 195 | { |
| 196 | png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data, |
| 197 | length); |
| 198 | } |
| 199 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 200 | /* This is used below to find the size of an image to pass to png_deflate_claim, |
| 201 | * so it only needs to be accurate if the size is less than 16384 bytes (the |
| 202 | * point at which a lower LZ window size can be used.) |
| 203 | */ |
| 204 | static png_alloc_size_t |
| 205 | png_image_size(png_structrp png_ptr) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 206 | { |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 207 | /* Only return sizes up to the maximum of a png_uint_32; do this by limiting |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 208 | * the width and height used to 15 bits. |
| 209 | */ |
| 210 | png_uint_32 h = png_ptr->height; |
| 211 | |
| 212 | if (png_ptr->rowbytes < 32768 && h < 32768) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 213 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 214 | if (png_ptr->interlaced != 0) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 215 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 216 | /* Interlacing makes the image larger because of the replication of |
| 217 | * both the filter byte and the padding to a byte boundary. |
| 218 | */ |
| 219 | png_uint_32 w = png_ptr->width; |
| 220 | unsigned int pd = png_ptr->pixel_depth; |
| 221 | png_alloc_size_t cb_base; |
| 222 | int pass; |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 223 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 224 | for (cb_base=0, pass=0; pass<=6; ++pass) |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 225 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 226 | png_uint_32 pw = PNG_PASS_COLS(w, pass); |
| 227 | |
| 228 | if (pw > 0) |
| 229 | cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 230 | } |
| 231 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 232 | return cb_base; |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 233 | } |
| 234 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 235 | else |
| 236 | return (png_ptr->rowbytes+1) * h; |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | else |
Glenn Randers-Pehrson | a8242fe | 2015-08-17 20:46:27 -0500 | [diff] [blame] | 240 | return 0xffffffffU; |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 241 | } |
| 242 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 243 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 244 | /* This is the code to hack the first two bytes of the deflate stream (the |
| 245 | * deflate header) to correct the windowBits value to match the actual data |
| 246 | * size. Note that the second argument is the *uncompressed* size but the |
| 247 | * first argument is the *compressed* data (and it must be deflate |
| 248 | * compressed.) |
| 249 | */ |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 250 | static void |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 251 | optimize_cmf(png_bytep data, png_alloc_size_t data_size) |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 252 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 253 | /* Optimize the CMF field in the zlib stream. The resultant zlib stream is |
| 254 | * still compliant to the stream specification. |
| 255 | */ |
| 256 | if (data_size <= 16384) /* else windowBits must be 15 */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 257 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 258 | unsigned int z_cmf = data[0]; /* zlib compression method and flags */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 259 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 260 | if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 261 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 262 | unsigned int z_cinfo; |
| 263 | unsigned int half_z_window_size; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 264 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 265 | z_cinfo = z_cmf >> 4; |
| 266 | half_z_window_size = 1U << (z_cinfo + 7); |
| 267 | |
| 268 | if (data_size <= half_z_window_size) /* else no change */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 269 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 270 | unsigned int tmp; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 271 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 272 | do |
| 273 | { |
| 274 | half_z_window_size >>= 1; |
| 275 | --z_cinfo; |
| 276 | } |
| 277 | while (z_cinfo > 0 && data_size <= half_z_window_size); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 278 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 279 | z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 280 | |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 281 | data[0] = (png_byte)z_cmf; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 282 | tmp = data[1] & 0xe0; |
| 283 | tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 284 | data[1] = (png_byte)tmp; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 285 | } |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 286 | } |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 287 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 288 | } |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 289 | #endif /* WRITE_OPTIMIZE_CMF */ |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 290 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 291 | /* Initialize the compressor for the appropriate type of compression. */ |
| 292 | static int |
| 293 | png_deflate_claim(png_structrp png_ptr, png_uint_32 owner, |
| 294 | png_alloc_size_t data_size) |
| 295 | { |
| 296 | if (png_ptr->zowner != 0) |
| 297 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 298 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 299 | char msg[64]; |
| 300 | |
| 301 | PNG_STRING_FROM_CHUNK(msg, owner); |
| 302 | msg[4] = ':'; |
| 303 | msg[5] = ' '; |
| 304 | PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner); |
| 305 | /* So the message that results is "<chunk> using zstream"; this is an |
| 306 | * internal error, but is very useful for debugging. i18n requirements |
| 307 | * are minimal. |
| 308 | */ |
| 309 | (void)png_safecat(msg, (sizeof msg), 10, " using zstream"); |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 310 | #endif |
John Bowler | 8ee821e | 2015-05-06 20:03:14 -0500 | [diff] [blame] | 311 | #if PNG_RELEASE_BUILD |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 312 | png_warning(png_ptr, msg); |
| 313 | |
| 314 | /* Attempt sane error recovery */ |
| 315 | if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */ |
| 316 | { |
| 317 | png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT"); |
| 318 | return Z_STREAM_ERROR; |
| 319 | } |
| 320 | |
| 321 | png_ptr->zowner = 0; |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 322 | #else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 323 | png_error(png_ptr, msg); |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 324 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | { |
| 328 | int level = png_ptr->zlib_level; |
| 329 | int method = png_ptr->zlib_method; |
| 330 | int windowBits = png_ptr->zlib_window_bits; |
| 331 | int memLevel = png_ptr->zlib_mem_level; |
| 332 | int strategy; /* set below */ |
| 333 | int ret; /* zlib return code */ |
| 334 | |
| 335 | if (owner == png_IDAT) |
| 336 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 337 | if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 338 | strategy = png_ptr->zlib_strategy; |
| 339 | |
| 340 | else if (png_ptr->do_filter != PNG_FILTER_NONE) |
| 341 | strategy = PNG_Z_DEFAULT_STRATEGY; |
| 342 | |
| 343 | else |
| 344 | strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY; |
| 345 | } |
| 346 | |
| 347 | else |
| 348 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 349 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 350 | level = png_ptr->zlib_text_level; |
| 351 | method = png_ptr->zlib_text_method; |
| 352 | windowBits = png_ptr->zlib_text_window_bits; |
| 353 | memLevel = png_ptr->zlib_text_mem_level; |
| 354 | strategy = png_ptr->zlib_text_strategy; |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 355 | #else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 356 | /* If customization is not supported the values all come from the |
| 357 | * IDAT values except for the strategy, which is fixed to the |
| 358 | * default. (This is the pre-1.6.0 behavior too, although it was |
| 359 | * implemented in a very different way.) |
| 360 | */ |
| 361 | strategy = Z_DEFAULT_STRATEGY; |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 362 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | /* Adjust 'windowBits' down if larger than 'data_size'; to stop this |
| 366 | * happening just pass 32768 as the data_size parameter. Notice that zlib |
| 367 | * requires an extra 262 bytes in the window in addition to the data to be |
| 368 | * able to see the whole of the data, so if data_size+262 takes us to the |
| 369 | * next windowBits size we need to fix up the value later. (Because even |
| 370 | * though deflate needs the extra window, inflate does not!) |
| 371 | */ |
| 372 | if (data_size <= 16384) |
| 373 | { |
| 374 | /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to |
| 375 | * work round a Microsoft Visual C misbehavior which, contrary to C-90, |
| 376 | * widens the result of the following shift to 64-bits if (and, |
| 377 | * apparently, only if) it is used in a test. |
| 378 | */ |
| 379 | unsigned int half_window_size = 1U << (windowBits-1); |
| 380 | |
| 381 | while (data_size + 262 <= half_window_size) |
| 382 | { |
| 383 | half_window_size >>= 1; |
| 384 | --windowBits; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* Check against the previous initialized values, if any. */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 389 | if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0 && |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 390 | (png_ptr->zlib_set_level != level || |
| 391 | png_ptr->zlib_set_method != method || |
| 392 | png_ptr->zlib_set_window_bits != windowBits || |
| 393 | png_ptr->zlib_set_mem_level != memLevel || |
| 394 | png_ptr->zlib_set_strategy != strategy)) |
| 395 | { |
| 396 | if (deflateEnd(&png_ptr->zstream) != Z_OK) |
| 397 | png_warning(png_ptr, "deflateEnd failed (ignored)"); |
| 398 | |
| 399 | png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED; |
| 400 | } |
| 401 | |
| 402 | /* For safety clear out the input and output pointers (currently zlib |
| 403 | * doesn't use them on Init, but it might in the future). |
| 404 | */ |
| 405 | png_ptr->zstream.next_in = NULL; |
| 406 | png_ptr->zstream.avail_in = 0; |
| 407 | png_ptr->zstream.next_out = NULL; |
| 408 | png_ptr->zstream.avail_out = 0; |
| 409 | |
| 410 | /* Now initialize if required, setting the new parameters, otherwise just |
| 411 | * to a simple reset to the previous parameters. |
| 412 | */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 413 | if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 414 | ret = deflateReset(&png_ptr->zstream); |
| 415 | |
| 416 | else |
| 417 | { |
| 418 | ret = deflateInit2(&png_ptr->zstream, level, method, windowBits, |
| 419 | memLevel, strategy); |
| 420 | |
| 421 | if (ret == Z_OK) |
| 422 | png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; |
| 423 | } |
| 424 | |
| 425 | /* The return code is from either deflateReset or deflateInit2; they have |
| 426 | * pretty much the same set of error codes. |
| 427 | */ |
| 428 | if (ret == Z_OK) |
| 429 | png_ptr->zowner = owner; |
| 430 | |
| 431 | else |
| 432 | png_zstream_error(png_ptr, ret); |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | /* Clean up (or trim) a linked list of compression buffers. */ |
| 439 | void /* PRIVATE */ |
| 440 | png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp) |
| 441 | { |
| 442 | png_compression_bufferp list = *listp; |
| 443 | |
| 444 | if (list != NULL) |
| 445 | { |
| 446 | *listp = NULL; |
| 447 | |
| 448 | do |
| 449 | { |
| 450 | png_compression_bufferp next = list->next; |
| 451 | |
| 452 | png_free(png_ptr, list); |
| 453 | list = next; |
| 454 | } |
| 455 | while (list != NULL); |
| 456 | } |
John Bowler | 134c576 | 2012-08-10 10:46:45 -0500 | [diff] [blame] | 457 | } |
| 458 | |
Glenn Randers-Pehrson | 205483d | 2011-04-01 12:33:42 -0500 | [diff] [blame] | 459 | #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 460 | /* This pair of functions encapsulates the operation of (a) compressing a |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 461 | * text string, and (b) issuing it later as a series of chunk data writes. |
| 462 | * The compression_state structure is shared context for these functions |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 463 | * set up by the caller to allow access to the relevant local variables. |
| 464 | * |
| 465 | * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size |
| 466 | * temporary buffers. From 1.6.0 it is retained in png_struct so that it will |
| 467 | * be correctly freed in the event of a write error (previous implementations |
| 468 | * just leaked memory.) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 469 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 470 | typedef struct |
| 471 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 472 | png_const_bytep input; /* The uncompressed input data */ |
| 473 | png_alloc_size_t input_len; /* Its length */ |
| 474 | png_uint_32 output_len; /* Final compressed length */ |
| 475 | png_byte output[1024]; /* First block of output */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 476 | } compression_state; |
| 477 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 478 | static void |
| 479 | png_text_compress_init(compression_state *comp, png_const_bytep input, |
| 480 | png_alloc_size_t input_len) |
| 481 | { |
| 482 | comp->input = input; |
| 483 | comp->input_len = input_len; |
| 484 | comp->output_len = 0; |
| 485 | } |
| 486 | |
| 487 | /* Compress the data in the compression state input */ |
| 488 | static int |
| 489 | png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name, |
| 490 | compression_state *comp, png_uint_32 prefix_len) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 491 | { |
| 492 | int ret; |
| 493 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 494 | /* To find the length of the output it is necessary to first compress the |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 495 | * input. The result is buffered rather than using the two-pass algorithm |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 496 | * that is used on the inflate side; deflate is assumed to be slower and a |
| 497 | * PNG writer is assumed to have more memory available than a PNG reader. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 498 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 499 | * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an |
| 500 | * upper limit on the output size, but it is always bigger than the input |
| 501 | * size so it is likely to be more efficient to use this linked-list |
| 502 | * approach. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 503 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 504 | ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 505 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 506 | if (ret != Z_OK) |
| 507 | return ret; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 508 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 509 | /* Set up the compression buffers, we need a loop here to avoid overflowing a |
| 510 | * uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited |
| 511 | * by the output buffer size, so there is no need to check that. Since this |
| 512 | * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits |
| 513 | * in size. |
| 514 | */ |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 515 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 516 | png_compression_bufferp *end = &png_ptr->zbuffer_list; |
| 517 | png_alloc_size_t input_len = comp->input_len; /* may be zero! */ |
| 518 | png_uint_32 output_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 519 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 520 | /* zlib updates these for us: */ |
| 521 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input); |
| 522 | png_ptr->zstream.avail_in = 0; /* Set below */ |
| 523 | png_ptr->zstream.next_out = comp->output; |
| 524 | png_ptr->zstream.avail_out = (sizeof comp->output); |
| 525 | |
| 526 | output_len = png_ptr->zstream.avail_out; |
| 527 | |
| 528 | do |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 529 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 530 | uInt avail_in = ZLIB_IO_MAX; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 531 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 532 | if (avail_in > input_len) |
| 533 | avail_in = (uInt)input_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 534 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 535 | input_len -= avail_in; |
| 536 | |
| 537 | png_ptr->zstream.avail_in = avail_in; |
| 538 | |
| 539 | if (png_ptr->zstream.avail_out == 0) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 540 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 541 | png_compression_buffer *next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 542 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 543 | /* Chunk data is limited to 2^31 bytes in length, so the prefix |
| 544 | * length must be counted here. |
| 545 | */ |
| 546 | if (output_len + prefix_len > PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 547 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 548 | ret = Z_MEM_ERROR; |
| 549 | break; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 550 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 551 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 552 | /* Need a new (malloc'ed) buffer, but there may be one present |
| 553 | * already. |
| 554 | */ |
| 555 | next = *end; |
| 556 | if (next == NULL) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 557 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 558 | next = png_voidcast(png_compression_bufferp, png_malloc_base |
| 559 | (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 560 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 561 | if (next == NULL) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 562 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 563 | ret = Z_MEM_ERROR; |
| 564 | break; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 565 | } |
| 566 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 567 | /* Link in this buffer (so that it will be freed later) */ |
| 568 | next->next = NULL; |
| 569 | *end = next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 570 | } |
| 571 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 572 | png_ptr->zstream.next_out = next->output; |
| 573 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
| 574 | output_len += png_ptr->zstream.avail_out; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 575 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 576 | /* Move 'end' to the next buffer pointer. */ |
| 577 | end = &next->next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 578 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 579 | |
| 580 | /* Compress the data */ |
| 581 | ret = deflate(&png_ptr->zstream, |
| 582 | input_len > 0 ? Z_NO_FLUSH : Z_FINISH); |
| 583 | |
| 584 | /* Claw back input data that was not consumed (because avail_in is |
| 585 | * reset above every time round the loop). |
| 586 | */ |
| 587 | input_len += png_ptr->zstream.avail_in; |
| 588 | png_ptr->zstream.avail_in = 0; /* safety */ |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 589 | } |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 590 | while (ret == Z_OK); |
| 591 | |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 592 | /* There may be some space left in the last output buffer. This needs to |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 593 | * be subtracted from output_len. |
| 594 | */ |
| 595 | output_len -= png_ptr->zstream.avail_out; |
| 596 | png_ptr->zstream.avail_out = 0; /* safety */ |
| 597 | comp->output_len = output_len; |
| 598 | |
| 599 | /* Now double check the output length, put in a custom message if it is |
| 600 | * too long. Otherwise ensure the z_stream::msg pointer is set to |
| 601 | * something. |
| 602 | */ |
| 603 | if (output_len + prefix_len >= PNG_UINT_31_MAX) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 604 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 605 | png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long"); |
| 606 | ret = Z_MEM_ERROR; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 607 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 608 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 609 | else |
| 610 | png_zstream_error(png_ptr, ret); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 611 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 612 | /* Reset zlib for another zTXt/iTXt or image data */ |
| 613 | png_ptr->zowner = 0; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 614 | |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 615 | /* The only success case is Z_STREAM_END, input_len must be 0; if not this |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 616 | * is an internal error. |
| 617 | */ |
| 618 | if (ret == Z_STREAM_END && input_len == 0) |
| 619 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 620 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 621 | /* Fix up the deflate header, if required */ |
| 622 | optimize_cmf(comp->output, comp->input_len); |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 623 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 624 | /* But Z_OK is returned, not Z_STREAM_END; this allows the claim |
| 625 | * function above to return Z_STREAM_END on an error (though it never |
| 626 | * does in the current versions of zlib.) |
| 627 | */ |
| 628 | return Z_OK; |
| 629 | } |
| 630 | |
| 631 | else |
| 632 | return ret; |
| 633 | } |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 634 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 635 | |
| 636 | /* Ship the compressed text out via chunk writes */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 637 | static void |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 638 | png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp) |
| 639 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 640 | png_uint_32 output_len = comp->output_len; |
| 641 | png_const_bytep output = comp->output; |
| 642 | png_uint_32 avail = (sizeof comp->output); |
| 643 | png_compression_buffer *next = png_ptr->zbuffer_list; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 644 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 645 | for (;;) |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 646 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 647 | if (avail > output_len) |
| 648 | avail = output_len; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 649 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 650 | png_write_chunk_data(png_ptr, output, avail); |
| 651 | |
| 652 | output_len -= avail; |
| 653 | |
| 654 | if (output_len == 0 || next == NULL) |
| 655 | break; |
| 656 | |
| 657 | avail = png_ptr->zbuffer_size; |
| 658 | output = next->output; |
| 659 | next = next->next; |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 660 | } |
| 661 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 662 | /* This is an internal error; 'next' must have been NULL! */ |
| 663 | if (output_len > 0) |
| 664 | png_error(png_ptr, "error writing ancillary chunked compressed data"); |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 665 | } |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 666 | #endif /* WRITE_COMPRESSED_TEXT */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 667 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 668 | /* Write the IHDR chunk, and update the png_struct with the necessary |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 669 | * information. Note that the rest of this code depends upon this |
| 670 | * information being correct. |
| 671 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 672 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 673 | png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 674 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 675 | int interlace_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 676 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 677 | png_byte buf[13]; /* Buffer to store the IHDR info */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 678 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 679 | png_debug(1, "in png_write_IHDR"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 680 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 681 | /* Check that we have valid input data from the application info */ |
| 682 | switch (color_type) |
| 683 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 684 | case PNG_COLOR_TYPE_GRAY: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 685 | switch (bit_depth) |
| 686 | { |
| 687 | case 1: |
| 688 | case 2: |
| 689 | case 4: |
| 690 | case 8: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 691 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 692 | case 16: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 693 | #endif |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 694 | png_ptr->channels = 1; break; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 695 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 696 | default: |
| 697 | png_error(png_ptr, |
| 698 | "Invalid bit depth for grayscale image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 699 | } |
| 700 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 701 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 702 | case PNG_COLOR_TYPE_RGB: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 703 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 704 | if (bit_depth != 8 && bit_depth != 16) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 705 | #else |
| 706 | if (bit_depth != 8) |
| 707 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 708 | png_error(png_ptr, "Invalid bit depth for RGB image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 709 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 710 | png_ptr->channels = 3; |
| 711 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 712 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 713 | case PNG_COLOR_TYPE_PALETTE: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 714 | switch (bit_depth) |
| 715 | { |
| 716 | case 1: |
| 717 | case 2: |
| 718 | case 4: |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 719 | case 8: |
| 720 | png_ptr->channels = 1; |
| 721 | break; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 722 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 723 | default: |
| 724 | png_error(png_ptr, "Invalid bit depth for paletted image"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 725 | } |
| 726 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 727 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 728 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 729 | if (bit_depth != 8 && bit_depth != 16) |
| 730 | png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 731 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 732 | png_ptr->channels = 2; |
| 733 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 734 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 735 | case PNG_COLOR_TYPE_RGB_ALPHA: |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 736 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 737 | if (bit_depth != 8 && bit_depth != 16) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 738 | #else |
| 739 | if (bit_depth != 8) |
| 740 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 741 | png_error(png_ptr, "Invalid bit depth for RGBA image"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 742 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 743 | png_ptr->channels = 4; |
| 744 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 745 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 746 | default: |
| 747 | png_error(png_ptr, "Invalid image color type specified"); |
| 748 | } |
| 749 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 750 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 751 | { |
| 752 | png_warning(png_ptr, "Invalid compression type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 753 | compression_type = PNG_COMPRESSION_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 754 | } |
| 755 | |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 756 | /* Write filter_method 64 (intrapixel differencing) only if |
| 757 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| 758 | * 2. Libpng did not write a PNG signature (this filter_method is only |
| 759 | * used in PNG datastreams that are embedded in MNG datastreams) and |
| 760 | * 3. The application called png_permit_mng_features with a mask that |
| 761 | * included PNG_FLAG_MNG_FILTER_64 and |
| 762 | * 4. The filter_method is 64 and |
| 763 | * 5. The color_type is RGB or RGBA |
| 764 | */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 765 | if ( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 766 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | b963fee | 2014-11-01 13:18:36 -0500 | [diff] [blame] | 767 | !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 && |
| 768 | ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 769 | (color_type == PNG_COLOR_TYPE_RGB || |
| 770 | color_type == PNG_COLOR_TYPE_RGB_ALPHA) && |
| 771 | (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 772 | #endif |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 773 | filter_type != PNG_FILTER_TYPE_BASE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 774 | { |
| 775 | png_warning(png_ptr, "Invalid filter type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 776 | filter_type = PNG_FILTER_TYPE_BASE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 777 | } |
| 778 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 779 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 780 | if (interlace_type != PNG_INTERLACE_NONE && |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 781 | interlace_type != PNG_INTERLACE_ADAM7) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 782 | { |
| 783 | png_warning(png_ptr, "Invalid interlace type specified"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 784 | interlace_type = PNG_INTERLACE_ADAM7; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 785 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 786 | #else |
| 787 | interlace_type=PNG_INTERLACE_NONE; |
| 788 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 789 | |
Glenn Randers-Pehrson | 7011a8c | 2015-02-27 18:53:44 -0600 | [diff] [blame] | 790 | /* Save the relevant information */ |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 791 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 792 | png_ptr->color_type = (png_byte)color_type; |
| 793 | png_ptr->interlaced = (png_byte)interlace_type; |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 794 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 795 | png_ptr->filter_type = (png_byte)filter_type; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 796 | #endif |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 797 | png_ptr->compression_type = (png_byte)compression_type; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 798 | png_ptr->width = width; |
| 799 | png_ptr->height = height; |
| 800 | |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 801 | png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 802 | png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width); |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 803 | /* Set the usr info, so any transformations can modify it */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 804 | png_ptr->usr_width = png_ptr->width; |
| 805 | png_ptr->usr_bit_depth = png_ptr->bit_depth; |
| 806 | png_ptr->usr_channels = png_ptr->channels; |
| 807 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 808 | /* Pack the header information into the buffer */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 809 | png_save_uint_32(buf, width); |
| 810 | png_save_uint_32(buf + 4, height); |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 811 | buf[8] = (png_byte)bit_depth; |
| 812 | buf[9] = (png_byte)color_type; |
| 813 | buf[10] = (png_byte)compression_type; |
| 814 | buf[11] = (png_byte)filter_type; |
| 815 | buf[12] = (png_byte)interlace_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 816 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 817 | /* Write the chunk */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 818 | png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 819 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 820 | if ((png_ptr->do_filter) == PNG_NO_FILTERS) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 821 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 822 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 823 | png_ptr->bit_depth < 8) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 824 | png_ptr->do_filter = PNG_FILTER_NONE; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 825 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 826 | else |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 827 | png_ptr->do_filter = PNG_ALL_FILTERS; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 828 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 829 | |
Glenn Randers-Pehrson | f837831 | 2011-03-31 22:06:04 -0500 | [diff] [blame] | 830 | png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 831 | } |
| 832 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 833 | /* Write the palette. We are careful not to trust png_color to be in the |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 834 | * correct order for PNG, so people can redefine it to any convenient |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 835 | * structure. |
| 836 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 837 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 838 | png_write_PLTE(png_structrp png_ptr, png_const_colorp palette, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 839 | png_uint_32 num_pal) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 840 | { |
Glenn Randers-Pehrson | a901eb3 | 2015-10-30 07:57:49 -0500 | [diff] [blame] | 841 | png_uint_32 max_palette_length, i; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 842 | png_const_colorp pal_ptr; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 843 | png_byte buf[3]; |
| 844 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 845 | png_debug(1, "in png_write_PLTE"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 846 | |
Glenn Randers-Pehrson | a901eb3 | 2015-10-30 07:57:49 -0500 | [diff] [blame] | 847 | max_palette_length = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? |
Glenn Randers-Pehrson | 81f4466 | 2015-10-29 09:26:41 -0500 | [diff] [blame] | 848 | (1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; |
| 849 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 850 | if (( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 851 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 852 | (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 853 | #endif |
Glenn Randers-Pehrson | a901eb3 | 2015-10-30 07:57:49 -0500 | [diff] [blame] | 854 | num_pal == 0) || num_pal > max_palette_length) |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 855 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 856 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 857 | { |
| 858 | png_error(png_ptr, "Invalid number of colors in palette"); |
| 859 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 860 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 861 | else |
| 862 | { |
| 863 | png_warning(png_ptr, "Invalid number of colors in palette"); |
| 864 | return; |
| 865 | } |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 866 | } |
| 867 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 868 | if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0) |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 869 | { |
| 870 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 871 | "Ignoring request to write a PLTE chunk in grayscale PNG"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 872 | |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 873 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 874 | } |
| 875 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 876 | png_ptr->num_palette = (png_uint_16)num_pal; |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 877 | png_debug1(3, "num_palette = %d", png_ptr->num_palette); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 878 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 879 | png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3)); |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 880 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 881 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 882 | for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 883 | { |
| 884 | buf[0] = pal_ptr->red; |
| 885 | buf[1] = pal_ptr->green; |
| 886 | buf[2] = pal_ptr->blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 887 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 888 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 889 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 890 | #else |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 891 | /* This is a little slower but some buggy compilers need to do this |
| 892 | * instead |
| 893 | */ |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 894 | pal_ptr=palette; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 895 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 896 | for (i = 0; i < num_pal; i++) |
| 897 | { |
| 898 | buf[0] = pal_ptr[i].red; |
| 899 | buf[1] = pal_ptr[i].green; |
| 900 | buf[2] = pal_ptr[i].blue; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 901 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 902 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 903 | |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 904 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 905 | png_write_chunk_end(png_ptr); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 906 | png_ptr->mode |= PNG_HAVE_PLTE; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 907 | } |
| 908 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 909 | /* This is similar to png_text_compress, above, except that it does not require |
| 910 | * all of the data at once and, instead of buffering the compressed result, |
| 911 | * writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out |
| 912 | * because it calls the write interface. As a result it does its own error |
| 913 | * reporting and does not return an error code. In the event of error it will |
| 914 | * just call png_error. The input data length may exceed 32-bits. The 'flush' |
| 915 | * parameter is exactly the same as that to deflate, with the following |
| 916 | * meanings: |
| 917 | * |
| 918 | * Z_NO_FLUSH: normal incremental output of compressed data |
| 919 | * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush |
| 920 | * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up |
| 921 | * |
| 922 | * The routine manages the acquire and release of the png_ptr->zstream by |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 923 | * checking and (at the end) clearing png_ptr->zowner; it does some sanity |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 924 | * checks on the 'mode' flags while doing this. |
| 925 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 926 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 927 | png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, |
| 928 | png_alloc_size_t input_len, int flush) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 929 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 930 | if (png_ptr->zowner != png_IDAT) |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 931 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 932 | /* First time. Ensure we have a temporary buffer for compression and |
| 933 | * trim the buffer list if it has more than one entry to free memory. |
| 934 | * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been |
| 935 | * created at this point, but the check here is quick and safe. |
Glenn Randers-Pehrson | ec8296a | 2011-04-01 15:09:05 -0500 | [diff] [blame] | 936 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 937 | if (png_ptr->zbuffer_list == NULL) |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 938 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 939 | png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp, |
| 940 | png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
| 941 | png_ptr->zbuffer_list->next = NULL; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 942 | } |
| 943 | |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 944 | else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 945 | png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next); |
| 946 | |
| 947 | /* It is a terminal error if we can't claim the zstream. */ |
| 948 | if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK) |
| 949 | png_error(png_ptr, png_ptr->zstream.msg); |
| 950 | |
| 951 | /* The output state is maintained in png_ptr->zstream, so it must be |
| 952 | * initialized here after the claim. |
| 953 | */ |
| 954 | png_ptr->zstream.next_out = png_ptr->zbuffer_list->output; |
| 955 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 956 | } |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 957 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 958 | /* Now loop reading and writing until all the input is consumed or an error |
| 959 | * terminates the operation. The _out values are maintained across calls to |
| 960 | * this function, but the input must be reset each time. |
Glenn Randers-Pehrson | f3af706 | 2012-02-02 23:11:45 -0600 | [diff] [blame] | 961 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 962 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); |
| 963 | png_ptr->zstream.avail_in = 0; /* set below */ |
| 964 | for (;;) |
| 965 | { |
| 966 | int ret; |
| 967 | |
| 968 | /* INPUT: from the row data */ |
| 969 | uInt avail = ZLIB_IO_MAX; |
| 970 | |
| 971 | if (avail > input_len) |
| 972 | avail = (uInt)input_len; /* safe because of the check */ |
| 973 | |
| 974 | png_ptr->zstream.avail_in = avail; |
| 975 | input_len -= avail; |
| 976 | |
| 977 | ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush); |
| 978 | |
| 979 | /* Include as-yet unconsumed input */ |
| 980 | input_len += png_ptr->zstream.avail_in; |
| 981 | png_ptr->zstream.avail_in = 0; |
| 982 | |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 983 | /* OUTPUT: write complete IDAT chunks when avail_out drops to zero. Note |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 984 | * that these two zstream fields are preserved across the calls, therefore |
| 985 | * there is no need to set these up on entry to the loop. |
| 986 | */ |
| 987 | if (png_ptr->zstream.avail_out == 0) |
| 988 | { |
| 989 | png_bytep data = png_ptr->zbuffer_list->output; |
| 990 | uInt size = png_ptr->zbuffer_size; |
| 991 | |
| 992 | /* Write an IDAT containing the data then reset the buffer. The |
| 993 | * first IDAT may need deflate header optimization. |
| 994 | */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 995 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 996 | if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 && |
| 997 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 998 | optimize_cmf(data, png_image_size(png_ptr)); |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 999 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1000 | |
| 1001 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1002 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 1003 | |
| 1004 | png_ptr->zstream.next_out = data; |
| 1005 | png_ptr->zstream.avail_out = size; |
| 1006 | |
| 1007 | /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with |
| 1008 | * the same flush parameter until it has finished output, for NO_FLUSH |
| 1009 | * it doesn't matter. |
| 1010 | */ |
| 1011 | if (ret == Z_OK && flush != Z_NO_FLUSH) |
| 1012 | continue; |
| 1013 | } |
| 1014 | |
Glenn Randers-Pehrson | 91e3a7d | 2014-10-03 17:16:00 -0500 | [diff] [blame] | 1015 | /* The order of these checks doesn't matter much; it just affects which |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1016 | * possible error might be detected if multiple things go wrong at once. |
| 1017 | */ |
| 1018 | if (ret == Z_OK) /* most likely return code! */ |
| 1019 | { |
| 1020 | /* If all the input has been consumed then just return. If Z_FINISH |
| 1021 | * was used as the flush parameter something has gone wrong if we get |
| 1022 | * here. |
| 1023 | */ |
| 1024 | if (input_len == 0) |
| 1025 | { |
| 1026 | if (flush == Z_FINISH) |
| 1027 | png_error(png_ptr, "Z_OK on Z_FINISH with output space"); |
| 1028 | |
| 1029 | return; |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | else if (ret == Z_STREAM_END && flush == Z_FINISH) |
| 1034 | { |
| 1035 | /* This is the end of the IDAT data; any pending output must be |
| 1036 | * flushed. For small PNG files we may still be at the beginning. |
| 1037 | */ |
| 1038 | png_bytep data = png_ptr->zbuffer_list->output; |
| 1039 | uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out; |
| 1040 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1041 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 1042 | if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 && |
| 1043 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
| 1044 | optimize_cmf(data, png_image_size(png_ptr)); |
| 1045 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1046 | |
| 1047 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1048 | png_ptr->zstream.avail_out = 0; |
| 1049 | png_ptr->zstream.next_out = NULL; |
| 1050 | png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; |
| 1051 | |
| 1052 | png_ptr->zowner = 0; /* Release the stream */ |
| 1053 | return; |
| 1054 | } |
| 1055 | |
| 1056 | else |
| 1057 | { |
| 1058 | /* This is an error condition. */ |
| 1059 | png_zstream_error(png_ptr, ret); |
| 1060 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1061 | } |
| 1062 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1063 | } |
| 1064 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1065 | /* Write an IEND chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1066 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1067 | png_write_IEND(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1068 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1069 | png_debug(1, "in png_write_IEND"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1070 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1071 | png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1072 | png_ptr->mode |= PNG_HAVE_IEND; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1073 | } |
| 1074 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1075 | #ifdef PNG_WRITE_gAMA_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1076 | /* Write a gAMA chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1077 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1078 | png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1079 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1080 | png_byte buf[4]; |
| 1081 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1082 | png_debug(1, "in png_write_gAMA"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1083 | |
Glenn Randers-Pehrson | 626afd6 | 2009-08-20 22:52:51 -0500 | [diff] [blame] | 1084 | /* file_gamma is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1085 | png_save_uint_32(buf, (png_uint_32)file_gamma); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1086 | png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1087 | } |
| 1088 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1089 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1090 | #ifdef PNG_WRITE_sRGB_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1091 | /* Write a sRGB chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1092 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1093 | png_write_sRGB(png_structrp png_ptr, int srgb_intent) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1094 | { |
| 1095 | png_byte buf[1]; |
| 1096 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1097 | png_debug(1, "in png_write_sRGB"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1098 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1099 | if (srgb_intent >= PNG_sRGB_INTENT_LAST) |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1100 | png_warning(png_ptr, |
| 1101 | "Invalid sRGB rendering intent specified"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1102 | |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1103 | buf[0]=(png_byte)srgb_intent; |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1104 | png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1105 | } |
| 1106 | #endif |
| 1107 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1108 | #ifdef PNG_WRITE_iCCP_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1109 | /* Write an iCCP chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1110 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1111 | png_write_iCCP(png_structrp png_ptr, png_const_charp name, |
| 1112 | png_const_bytep profile) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1113 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1114 | png_uint_32 name_len; |
| 1115 | png_uint_32 profile_len; |
| 1116 | png_byte new_name[81]; /* 1 byte for the compression byte */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1117 | compression_state comp; |
Glenn Randers-Pehrson | ab9736a | 2014-04-25 06:14:50 -0500 | [diff] [blame] | 1118 | png_uint_32 temp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1119 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1120 | png_debug(1, "in png_write_iCCP"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1121 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1122 | /* These are all internal problems: the profile should have been checked |
| 1123 | * before when it was stored. |
| 1124 | */ |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1125 | if (profile == NULL) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1126 | png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1127 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1128 | profile_len = png_get_uint_32(profile); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1129 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1130 | if (profile_len < 132) |
| 1131 | png_error(png_ptr, "ICC profile too short"); |
| 1132 | |
Glenn Randers-Pehrson | ab9736a | 2014-04-25 06:14:50 -0500 | [diff] [blame] | 1133 | temp = (png_uint_32) (*(profile+8)); |
| 1134 | if (temp > 3 && (profile_len & 0x03)) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1135 | png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); |
| 1136 | |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1137 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1138 | png_uint_32 embedded_profile_len = png_get_uint_32(profile); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1139 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1140 | if (profile_len != embedded_profile_len) |
| 1141 | png_error(png_ptr, "Profile length does not match profile"); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1142 | } |
| 1143 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1144 | name_len = png_check_keyword(png_ptr, name, new_name); |
John Bowler | cf49919 | 2012-03-01 21:54:07 -0600 | [diff] [blame] | 1145 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1146 | if (name_len == 0) |
| 1147 | png_error(png_ptr, "iCCP: invalid keyword"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1148 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1149 | new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE; |
Glenn Randers-Pehrson | 3a054e1 | 2009-08-01 08:53:23 -0500 | [diff] [blame] | 1150 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1151 | /* Make sure we include the NULL after the name and the compression type */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1152 | ++name_len; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1153 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1154 | png_text_compress_init(&comp, profile, profile_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1155 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1156 | /* Allow for keyword terminator and compression byte */ |
| 1157 | if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) |
| 1158 | png_error(png_ptr, png_ptr->zstream.msg); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1159 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1160 | png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len); |
| 1161 | |
| 1162 | png_write_chunk_data(png_ptr, new_name, name_len); |
| 1163 | |
| 1164 | png_write_compressed_data_out(png_ptr, &comp); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1165 | |
| 1166 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1167 | } |
| 1168 | #endif |
| 1169 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1170 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1171 | /* Write a sPLT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1172 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1173 | png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1174 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1175 | png_uint_32 name_len; |
| 1176 | png_byte new_name[80]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1177 | png_byte entrybuf[10]; |
Glenn Randers-Pehrson | 9c90d7f | 2009-07-19 13:11:25 -0500 | [diff] [blame] | 1178 | png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); |
| 1179 | png_size_t palette_size = entry_size * spalette->nentries; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1180 | png_sPLT_entryp ep; |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1181 | #ifndef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1182 | int i; |
| 1183 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1184 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1185 | png_debug(1, "in png_write_sPLT"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1186 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1187 | name_len = png_check_keyword(png_ptr, spalette->name, new_name); |
| 1188 | |
| 1189 | if (name_len == 0) |
| 1190 | png_error(png_ptr, "sPLT: invalid keyword"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1191 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1192 | /* Make sure we include the NULL after the name */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1193 | png_write_chunk_header(png_ptr, png_sPLT, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1194 | (png_uint_32)(name_len + 2 + palette_size)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1195 | |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1196 | png_write_chunk_data(png_ptr, (png_bytep)new_name, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1197 | (png_size_t)(name_len + 1)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1198 | |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1199 | png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1200 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1201 | /* Loop through each palette entry, writing appropriately */ |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1202 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1203 | for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1204 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1205 | if (spalette->depth == 8) |
| 1206 | { |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1207 | entrybuf[0] = (png_byte)ep->red; |
| 1208 | entrybuf[1] = (png_byte)ep->green; |
| 1209 | entrybuf[2] = (png_byte)ep->blue; |
| 1210 | entrybuf[3] = (png_byte)ep->alpha; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1211 | png_save_uint_16(entrybuf + 4, ep->frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1212 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1213 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1214 | else |
| 1215 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1216 | png_save_uint_16(entrybuf + 0, ep->red); |
| 1217 | png_save_uint_16(entrybuf + 2, ep->green); |
| 1218 | png_save_uint_16(entrybuf + 4, ep->blue); |
| 1219 | png_save_uint_16(entrybuf + 6, ep->alpha); |
| 1220 | png_save_uint_16(entrybuf + 8, ep->frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1221 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1222 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1223 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1224 | } |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1225 | #else |
| 1226 | ep=spalette->entries; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1227 | for (i = 0; i>spalette->nentries; i++) |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1228 | { |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1229 | if (spalette->depth == 8) |
| 1230 | { |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1231 | entrybuf[0] = (png_byte)ep[i].red; |
| 1232 | entrybuf[1] = (png_byte)ep[i].green; |
| 1233 | entrybuf[2] = (png_byte)ep[i].blue; |
| 1234 | entrybuf[3] = (png_byte)ep[i].alpha; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1235 | png_save_uint_16(entrybuf + 4, ep[i].frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1236 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1237 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1238 | else |
| 1239 | { |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1240 | png_save_uint_16(entrybuf + 0, ep[i].red); |
| 1241 | png_save_uint_16(entrybuf + 2, ep[i].green); |
| 1242 | png_save_uint_16(entrybuf + 4, ep[i].blue); |
| 1243 | png_save_uint_16(entrybuf + 6, ep[i].alpha); |
| 1244 | png_save_uint_16(entrybuf + 8, ep[i].frequency); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1245 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1246 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1247 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 1248 | } |
| 1249 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1250 | |
| 1251 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1252 | } |
| 1253 | #endif |
| 1254 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1255 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1256 | /* Write the sBIT chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1257 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1258 | png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1259 | { |
| 1260 | png_byte buf[4]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1261 | png_size_t size; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1262 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1263 | png_debug(1, "in png_write_sBIT"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1264 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1265 | /* Make sure we don't depend upon the order of PNG_COLOR_8 */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1266 | if ((color_type & PNG_COLOR_MASK_COLOR) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1267 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1268 | png_byte maxbits; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1269 | |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1270 | maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : |
| 1271 | png_ptr->usr_bit_depth); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1272 | |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1273 | if (sbit->red == 0 || sbit->red > maxbits || |
| 1274 | sbit->green == 0 || sbit->green > maxbits || |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1275 | sbit->blue == 0 || sbit->blue > maxbits) |
| 1276 | { |
| 1277 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1278 | return; |
| 1279 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1280 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1281 | buf[0] = sbit->red; |
| 1282 | buf[1] = sbit->green; |
| 1283 | buf[2] = sbit->blue; |
| 1284 | size = 3; |
| 1285 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1286 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1287 | else |
| 1288 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1289 | if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
| 1290 | { |
| 1291 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1292 | return; |
| 1293 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1294 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1295 | buf[0] = sbit->gray; |
| 1296 | size = 1; |
| 1297 | } |
| 1298 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1299 | if ((color_type & PNG_COLOR_MASK_ALPHA) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1300 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1301 | if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
| 1302 | { |
| 1303 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1304 | return; |
| 1305 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1306 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1307 | buf[size++] = sbit->alpha; |
| 1308 | } |
| 1309 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1310 | png_write_complete_chunk(png_ptr, png_sBIT, buf, size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1311 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1312 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1313 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1314 | #ifdef PNG_WRITE_cHRM_SUPPORTED |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1315 | /* Write the cHRM chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1316 | void /* PRIVATE */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1317 | png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1318 | { |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1319 | png_byte buf[32]; |
| 1320 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1321 | png_debug(1, "in png_write_cHRM"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1322 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1323 | /* Each value is saved in 1/100,000ths */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1324 | png_save_int_32(buf, xy->whitex); |
| 1325 | png_save_int_32(buf + 4, xy->whitey); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1326 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1327 | png_save_int_32(buf + 8, xy->redx); |
| 1328 | png_save_int_32(buf + 12, xy->redy); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1329 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1330 | png_save_int_32(buf + 16, xy->greenx); |
| 1331 | png_save_int_32(buf + 20, xy->greeny); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1332 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1333 | png_save_int_32(buf + 24, xy->bluex); |
| 1334 | png_save_int_32(buf + 28, xy->bluey); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1335 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1336 | png_write_complete_chunk(png_ptr, png_cHRM, buf, 32); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1337 | } |
| 1338 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1339 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1340 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1341 | /* Write the tRNS chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1342 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1343 | png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1344 | png_const_color_16p tran, int num_trans, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1345 | { |
| 1346 | png_byte buf[6]; |
| 1347 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1348 | png_debug(1, "in png_write_tRNS"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1349 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1350 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1351 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1352 | if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1353 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1354 | png_app_warning(png_ptr, |
| 1355 | "Invalid number of transparent colors specified"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1356 | return; |
| 1357 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1358 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1359 | /* Write the chunk out as it is */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1360 | png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha, |
| 1361 | (png_size_t)num_trans); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1362 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1363 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1364 | else if (color_type == PNG_COLOR_TYPE_GRAY) |
| 1365 | { |
Glenn Randers-Pehrson | 8b83ff3 | 2015-08-13 20:57:18 -0500 | [diff] [blame] | 1366 | /* One 16-bit value */ |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1367 | if (tran->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1368 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1369 | png_app_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1370 | "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1371 | |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1372 | return; |
| 1373 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1374 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1375 | png_save_uint_16(buf, tran->gray); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1376 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1377 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1378 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1379 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 1380 | { |
Glenn Randers-Pehrson | 8b83ff3 | 2015-08-13 20:57:18 -0500 | [diff] [blame] | 1381 | /* Three 16-bit values */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1382 | png_save_uint_16(buf, tran->red); |
| 1383 | png_save_uint_16(buf + 2, tran->green); |
| 1384 | png_save_uint_16(buf + 4, tran->blue); |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1385 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1386 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1387 | #else |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1388 | if ((buf[0] | buf[2] | buf[4]) != 0) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1389 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1390 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1391 | png_app_warning(png_ptr, |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1392 | "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8"); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1393 | return; |
| 1394 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1395 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1396 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1397 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1398 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1399 | else |
| 1400 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1401 | png_app_warning(png_ptr, "Can't write tRNS with an alpha channel"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1402 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1403 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1404 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1405 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1406 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1407 | /* Write the background chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1408 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1409 | png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1410 | { |
| 1411 | png_byte buf[6]; |
| 1412 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1413 | png_debug(1, "in png_write_bKGD"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1414 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1415 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1416 | { |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1417 | if ( |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1418 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1419 | (png_ptr->num_palette != 0 || |
| 1420 | (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0) && |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1421 | #endif |
Glenn Randers-Pehrson | d6d8075 | 2008-12-02 09:49:43 -0600 | [diff] [blame] | 1422 | back->index >= png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1423 | { |
| 1424 | png_warning(png_ptr, "Invalid background palette index"); |
| 1425 | return; |
| 1426 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1427 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1428 | buf[0] = back->index; |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1429 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1430 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1431 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1432 | else if ((color_type & PNG_COLOR_MASK_COLOR) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1433 | { |
| 1434 | png_save_uint_16(buf, back->red); |
| 1435 | png_save_uint_16(buf + 2, back->green); |
| 1436 | png_save_uint_16(buf + 4, back->blue); |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1437 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1438 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1439 | #else |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1440 | if ((buf[0] | buf[2] | buf[4]) != 0) |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 1441 | #endif |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1442 | { |
| 1443 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1444 | "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1445 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1446 | return; |
| 1447 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1448 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1449 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1450 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1451 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1452 | else |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1453 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1454 | if (back->gray >= (1 << png_ptr->bit_depth)) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1455 | { |
| 1456 | png_warning(png_ptr, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1457 | "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1458 | |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 1459 | return; |
| 1460 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1461 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1462 | png_save_uint_16(buf, back->gray); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1463 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1464 | } |
| 1465 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1466 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1467 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1468 | #ifdef PNG_WRITE_hIST_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1469 | /* Write the histogram */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1470 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1471 | png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1472 | { |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1473 | int i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1474 | png_byte buf[3]; |
| 1475 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1476 | png_debug(1, "in png_write_hIST"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1477 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1478 | if (num_hist > (int)png_ptr->num_palette) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1479 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1480 | png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1481 | png_ptr->num_palette); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1482 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1483 | png_warning(png_ptr, "Invalid number of histogram entries specified"); |
| 1484 | return; |
| 1485 | } |
| 1486 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1487 | png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2)); |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1488 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1489 | for (i = 0; i < num_hist; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1490 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1491 | png_save_uint_16(buf, hist[i]); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1492 | png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1493 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1494 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1495 | png_write_chunk_end(png_ptr); |
| 1496 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1497 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1498 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1499 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1500 | /* Write a tEXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1501 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1502 | png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1503 | png_size_t text_len) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1504 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1505 | png_uint_32 key_len; |
| 1506 | png_byte new_key[80]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1507 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1508 | png_debug(1, "in png_write_tEXt"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1509 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1510 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1511 | |
| 1512 | if (key_len == 0) |
| 1513 | png_error(png_ptr, "tEXt: invalid keyword"); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1514 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1515 | if (text == NULL || *text == '\0') |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1516 | text_len = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1517 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1518 | else |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1519 | text_len = strlen(text); |
| 1520 | |
| 1521 | if (text_len > PNG_UINT_31_MAX - (key_len+1)) |
| 1522 | png_error(png_ptr, "tEXt: text too long"); |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1523 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1524 | /* Make sure we include the 0 after the key */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1525 | png_write_chunk_header(png_ptr, png_tEXt, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1526 | (png_uint_32)/*checked above*/(key_len + text_len + 1)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1527 | /* |
| 1528 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1529 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1530 | * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1531 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1532 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1533 | png_write_chunk_data(png_ptr, new_key, key_len + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1534 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1535 | if (text_len != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1536 | png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1537 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1538 | png_write_chunk_end(png_ptr); |
| 1539 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1540 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1541 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1542 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1543 | /* Write a compressed text chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1544 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1545 | png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
Glenn Randers-Pehrson | d752225 | 2014-10-03 17:00:38 -0500 | [diff] [blame] | 1546 | int compression) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1547 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1548 | png_uint_32 key_len; |
| 1549 | png_byte new_key[81]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1550 | compression_state comp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1551 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1552 | png_debug(1, "in png_write_zTXt"); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1553 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1554 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1555 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1556 | png_write_tEXt(png_ptr, key, text, 0); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1557 | return; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1558 | } |
| 1559 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1560 | if (compression != PNG_TEXT_COMPRESSION_zTXt) |
| 1561 | png_error(png_ptr, "zTXt: invalid compression type"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1562 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1563 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1564 | |
| 1565 | if (key_len == 0) |
| 1566 | png_error(png_ptr, "zTXt: invalid keyword"); |
| 1567 | |
| 1568 | /* Add the compression method and 1 for the keyword separator. */ |
| 1569 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1570 | ++key_len; |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1571 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1572 | /* Compute the compressed data; do it now for the length */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1573 | png_text_compress_init(&comp, (png_const_bytep)text, |
| 1574 | text == NULL ? 0 : strlen(text)); |
| 1575 | |
| 1576 | if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK) |
| 1577 | png_error(png_ptr, png_ptr->zstream.msg); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1578 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1579 | /* Write start of chunk */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1580 | png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1581 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1582 | /* Write key */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1583 | png_write_chunk_data(png_ptr, new_key, key_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1584 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1585 | /* Write the compressed data */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1586 | png_write_compressed_data_out(png_ptr, &comp); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1587 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1588 | /* Close the chunk */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1589 | png_write_chunk_end(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1590 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1591 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1592 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1593 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1594 | /* Write an iTXt chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1595 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1596 | png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1597 | png_const_charp lang, png_const_charp lang_key, png_const_charp text) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1598 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1599 | png_uint_32 key_len, prefix_len; |
| 1600 | png_size_t lang_len, lang_key_len; |
| 1601 | png_byte new_key[82]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1602 | compression_state comp; |
| 1603 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1604 | png_debug(1, "in png_write_iTXt"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1605 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1606 | key_len = png_check_keyword(png_ptr, key, new_key); |
Glenn Randers-Pehrson | 3744f94 | 2012-08-10 19:22:53 -0500 | [diff] [blame] | 1607 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1608 | if (key_len == 0) |
| 1609 | png_error(png_ptr, "iTXt: invalid keyword"); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 1610 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1611 | /* Set the compression flag */ |
| 1612 | switch (compression) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1613 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1614 | case PNG_ITXT_COMPRESSION_NONE: |
| 1615 | case PNG_TEXT_COMPRESSION_NONE: |
| 1616 | compression = new_key[++key_len] = 0; /* no compression */ |
| 1617 | break; |
| 1618 | |
| 1619 | case PNG_TEXT_COMPRESSION_zTXt: |
| 1620 | case PNG_ITXT_COMPRESSION_zTXt: |
| 1621 | compression = new_key[++key_len] = 1; /* compressed */ |
| 1622 | break; |
| 1623 | |
| 1624 | default: |
| 1625 | png_error(png_ptr, "iTXt: invalid compression"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1626 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1627 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1628 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1629 | ++key_len; /* for the keywod separator */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1630 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1631 | /* We leave it to the application to meet PNG-1.0 requirements on the |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1632 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1633 | * any non-Latin-1 characters except for NEWLINE. ISO PNG, however, |
| 1634 | * specifies that the text is UTF-8 and this really doesn't require any |
| 1635 | * checking. |
| 1636 | * |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1637 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1638 | * |
| 1639 | * TODO: validate the language tag correctly (see the spec.) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1640 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1641 | if (lang == NULL) lang = ""; /* empty language is valid */ |
| 1642 | lang_len = strlen(lang)+1; |
| 1643 | if (lang_key == NULL) lang_key = ""; /* may be empty */ |
| 1644 | lang_key_len = strlen(lang_key)+1; |
| 1645 | if (text == NULL) text = ""; /* may be empty */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1646 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1647 | prefix_len = key_len; |
| 1648 | if (lang_len > PNG_UINT_31_MAX-prefix_len) |
| 1649 | prefix_len = PNG_UINT_31_MAX; |
| 1650 | else |
| 1651 | prefix_len = (png_uint_32)(prefix_len + lang_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1652 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1653 | if (lang_key_len > PNG_UINT_31_MAX-prefix_len) |
| 1654 | prefix_len = PNG_UINT_31_MAX; |
| 1655 | else |
| 1656 | prefix_len = (png_uint_32)(prefix_len + lang_key_len); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1657 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1658 | png_text_compress_init(&comp, (png_const_bytep)text, strlen(text)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1659 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1660 | if (compression != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1661 | { |
| 1662 | if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) |
| 1663 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1664 | } |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1665 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1666 | else |
| 1667 | { |
| 1668 | if (comp.input_len > PNG_UINT_31_MAX-prefix_len) |
| 1669 | png_error(png_ptr, "iTXt: uncompressed text too long"); |
John Bowler | 70eb072 | 2013-04-13 16:52:09 -0500 | [diff] [blame] | 1670 | |
| 1671 | /* So the string will fit in a chunk: */ |
| 1672 | comp.output_len = (png_uint_32)/*SAFE*/comp.input_len; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1673 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1674 | |
John Bowler | 70eb072 | 2013-04-13 16:52:09 -0500 | [diff] [blame] | 1675 | png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len); |
| 1676 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1677 | png_write_chunk_data(png_ptr, new_key, key_len); |
| 1678 | |
| 1679 | png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len); |
| 1680 | |
| 1681 | png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len); |
| 1682 | |
Glenn Randers-Pehrson | 0567015 | 2014-03-08 12:39:52 -0600 | [diff] [blame] | 1683 | if (compression != 0) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1684 | png_write_compressed_data_out(png_ptr, &comp); |
| 1685 | |
| 1686 | else |
Glenn Randers-Pehrson | 6ef579d | 2015-01-27 07:02:46 -0600 | [diff] [blame] | 1687 | png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.output_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1688 | |
| 1689 | png_write_chunk_end(png_ptr); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1690 | } |
| 1691 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1692 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1693 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1694 | /* Write the oFFs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1695 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1696 | png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1697 | int unit_type) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1698 | { |
| 1699 | png_byte buf[9]; |
| 1700 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1701 | png_debug(1, "in png_write_oFFs"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1702 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1703 | if (unit_type >= PNG_OFFSET_LAST) |
| 1704 | png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); |
| 1705 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1706 | png_save_int_32(buf, x_offset); |
| 1707 | png_save_int_32(buf + 4, y_offset); |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1708 | buf[8] = (png_byte)unit_type; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1709 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1710 | png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1711 | } |
| 1712 | #endif |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1713 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1714 | /* Write the pCAL chunk (described in the PNG extensions document) */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1715 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1716 | png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0, |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 1717 | png_int_32 X1, int type, int nparams, png_const_charp units, |
| 1718 | png_charpp params) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1719 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1720 | png_uint_32 purpose_len; |
| 1721 | png_size_t units_len, total_len; |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1722 | png_size_tp params_len; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1723 | png_byte buf[10]; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1724 | png_byte new_purpose[80]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1725 | int i; |
| 1726 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1727 | png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1728 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1729 | if (type >= PNG_EQUATION_LAST) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1730 | png_error(png_ptr, "Unrecognized equation type for pCAL chunk"); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1731 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1732 | purpose_len = png_check_keyword(png_ptr, purpose, new_purpose); |
| 1733 | |
| 1734 | if (purpose_len == 0) |
| 1735 | png_error(png_ptr, "pCAL: invalid keyword"); |
| 1736 | |
| 1737 | ++purpose_len; /* terminator */ |
| 1738 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1739 | png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1740 | units_len = strlen(units) + (nparams == 0 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1741 | png_debug1(3, "pCAL units length = %d", (int)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1742 | total_len = purpose_len + units_len + 10; |
| 1743 | |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1744 | params_len = (png_size_tp)png_malloc(png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1745 | (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1746 | |
| 1747 | /* Find the length of each parameter, making sure we don't count the |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1748 | * null terminator for the last parameter. |
| 1749 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1750 | for (i = 0; i < nparams; i++) |
| 1751 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1752 | params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1753 | png_debug2(3, "pCAL parameter %d length = %lu", i, |
Glenn Randers-Pehrson | d233287 | 2010-10-12 19:19:28 -0500 | [diff] [blame] | 1754 | (unsigned long)params_len[i]); |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1755 | total_len += params_len[i]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1756 | } |
| 1757 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1758 | png_debug1(3, "pCAL total length = %d", (int)total_len); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1759 | png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1760 | png_write_chunk_data(png_ptr, new_purpose, purpose_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1761 | png_save_int_32(buf, X0); |
| 1762 | png_save_int_32(buf + 4, X1); |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1763 | buf[8] = (png_byte)type; |
| 1764 | buf[9] = (png_byte)nparams; |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1765 | png_write_chunk_data(png_ptr, buf, (png_size_t)10); |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1766 | png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1767 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1768 | for (i = 0; i < nparams; i++) |
| 1769 | { |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 1770 | png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1771 | } |
| 1772 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1773 | png_free(png_ptr, params_len); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1774 | png_write_chunk_end(png_ptr); |
| 1775 | } |
| 1776 | #endif |
| 1777 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1778 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1779 | /* Write the sCAL chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1780 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1781 | png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1782 | png_const_charp height) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1783 | { |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1784 | png_byte buf[64]; |
| 1785 | png_size_t wlen, hlen, total_len; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1786 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1787 | png_debug(1, "in png_write_sCAL_s"); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1788 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1789 | wlen = strlen(width); |
| 1790 | hlen = strlen(height); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1791 | total_len = wlen + hlen + 2; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1792 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1793 | if (total_len > 64) |
| 1794 | { |
| 1795 | png_warning(png_ptr, "Can't write sCAL (buffer too small)"); |
| 1796 | return; |
| 1797 | } |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1798 | |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1799 | buf[0] = (png_byte)unit; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1800 | memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ |
| 1801 | memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1802 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1803 | png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1804 | png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1805 | } |
| 1806 | #endif |
| 1807 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1808 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1809 | /* Write the pHYs chunk */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1810 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1811 | png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1812 | png_uint_32 y_pixels_per_unit, |
| 1813 | int unit_type) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1814 | { |
| 1815 | png_byte buf[9]; |
| 1816 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1817 | png_debug(1, "in png_write_pHYs"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1818 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1819 | if (unit_type >= PNG_RESOLUTION_LAST) |
| 1820 | png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); |
| 1821 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1822 | png_save_uint_32(buf, x_pixels_per_unit); |
| 1823 | png_save_uint_32(buf + 4, y_pixels_per_unit); |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1824 | buf[8] = (png_byte)unit_type; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1825 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1826 | png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1827 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1828 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1829 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 1830 | #ifdef PNG_WRITE_tIME_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1831 | /* Write the tIME chunk. Use either png_convert_from_struct_tm() |
| 1832 | * or png_convert_from_time_t(), or fill in the structure yourself. |
| 1833 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1834 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1835 | png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1836 | { |
| 1837 | png_byte buf[7]; |
| 1838 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1839 | png_debug(1, "in png_write_tIME"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1840 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1841 | if (mod_time->month > 12 || mod_time->month < 1 || |
| 1842 | mod_time->day > 31 || mod_time->day < 1 || |
| 1843 | mod_time->hour > 23 || mod_time->second > 60) |
| 1844 | { |
| 1845 | png_warning(png_ptr, "Invalid time specified for tIME chunk"); |
| 1846 | return; |
| 1847 | } |
| 1848 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1849 | png_save_uint_16(buf, mod_time->year); |
| 1850 | buf[2] = mod_time->month; |
| 1851 | buf[3] = mod_time->day; |
| 1852 | buf[4] = mod_time->hour; |
| 1853 | buf[5] = mod_time->minute; |
| 1854 | buf[6] = mod_time->second; |
| 1855 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1856 | png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1857 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1858 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1859 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1860 | /* Initializes the row writing capability of libpng */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1861 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1862 | png_write_start_row(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1863 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1864 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1865 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1866 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1867 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1868 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1869 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1870 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1871 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1872 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1873 | /* Start of interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1874 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1875 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1876 | /* Offset to next interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1877 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1878 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1879 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1880 | png_alloc_size_t buf_size; |
| 1881 | int usr_pixel_depth; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1882 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1883 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
John Bowler | 2dfcf65 | 2015-06-03 14:58:18 -0500 | [diff] [blame] | 1884 | png_byte filters; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1885 | #endif |
| 1886 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1887 | png_debug(1, "in png_write_start_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1888 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1889 | usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth; |
| 1890 | buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1; |
| 1891 | |
| 1892 | /* 1.5.6: added to allow checking in the row write code. */ |
| 1893 | png_ptr->transformed_pixel_depth = png_ptr->pixel_depth; |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 1894 | png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1895 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1896 | /* Set up row buffer */ |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1897 | png_ptr->row_buf = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size)); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1898 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1899 | png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1900 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1901 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1902 | filters = png_ptr->do_filter; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1903 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1904 | if (png_ptr->height == 1) |
John Bowler | 2dfcf65 | 2015-06-03 14:58:18 -0500 | [diff] [blame] | 1905 | filters &= 0xff & ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1906 | |
| 1907 | if (png_ptr->width == 1) |
John Bowler | 2dfcf65 | 2015-06-03 14:58:18 -0500 | [diff] [blame] | 1908 | filters &= 0xff & ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1909 | |
| 1910 | if (filters == 0) |
| 1911 | filters = PNG_FILTER_NONE; |
| 1912 | |
| 1913 | png_ptr->do_filter = filters; |
| 1914 | |
| 1915 | if (((filters & (PNG_FILTER_SUB | PNG_FILTER_UP | PNG_FILTER_AVG | |
| 1916 | PNG_FILTER_PAETH)) != 0) && png_ptr->try_row == NULL) |
| 1917 | { |
| 1918 | int num_filters = 0; |
| 1919 | |
| 1920 | png_ptr->try_row = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size)); |
| 1921 | |
| 1922 | if (filters & PNG_FILTER_SUB) |
| 1923 | num_filters++; |
| 1924 | |
| 1925 | if (filters & PNG_FILTER_UP) |
| 1926 | num_filters++; |
| 1927 | |
| 1928 | if (filters & PNG_FILTER_AVG) |
| 1929 | num_filters++; |
| 1930 | |
| 1931 | if (filters & PNG_FILTER_PAETH) |
| 1932 | num_filters++; |
| 1933 | |
| 1934 | if (num_filters > 1) |
| 1935 | png_ptr->tst_row = png_voidcast(png_bytep, png_malloc(png_ptr, |
| 1936 | buf_size)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1937 | } |
| 1938 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 1939 | /* We only need to keep the previous row if we are using one of the following |
| 1940 | * filters. |
| 1941 | */ |
| 1942 | if ((filters & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) != 0) |
John Bowler | 7023d87 | 2015-06-03 15:04:03 -0500 | [diff] [blame] | 1943 | png_ptr->prev_row = png_voidcast(png_bytep, |
| 1944 | png_calloc(png_ptr, buf_size)); |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 1945 | #endif /* WRITE_FILTER */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1946 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1947 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1948 | /* If interlaced, we need to set up width and height of pass */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1949 | if (png_ptr->interlaced != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1950 | { |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 1951 | if ((png_ptr->transformations & PNG_INTERLACE) == 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1952 | { |
| 1953 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1954 | png_pass_ystart[0]) / png_pass_yinc[0]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1955 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1956 | png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 1957 | png_pass_start[0]) / png_pass_inc[0]; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1958 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1959 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1960 | else |
| 1961 | { |
| 1962 | png_ptr->num_rows = png_ptr->height; |
| 1963 | png_ptr->usr_width = png_ptr->width; |
| 1964 | } |
| 1965 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 1966 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1967 | else |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1968 | #endif |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 1969 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1970 | png_ptr->num_rows = png_ptr->height; |
| 1971 | png_ptr->usr_width = png_ptr->width; |
| 1972 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1973 | } |
| 1974 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1975 | /* Internal use only. Called when finished processing a row of data. */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 1976 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1977 | png_write_finish_row(png_structrp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1978 | { |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 1979 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1980 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1981 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1982 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1983 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1984 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1985 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1986 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1987 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1988 | /* Start of interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1989 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1990 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 1991 | /* Offset to next interlace block in the y direction */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1992 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 1993 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1994 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 1995 | png_debug(1, "in png_write_finish_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 1996 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 1997 | /* Next row */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1998 | png_ptr->row_number++; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 1999 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2000 | /* See if we are done */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2001 | if (png_ptr->row_number < png_ptr->num_rows) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2002 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2003 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2004 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2005 | /* If interlaced, go to next pass */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2006 | if (png_ptr->interlaced != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2007 | { |
| 2008 | png_ptr->row_number = 0; |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2009 | if ((png_ptr->transformations & PNG_INTERLACE) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2010 | { |
| 2011 | png_ptr->pass++; |
| 2012 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2013 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2014 | else |
| 2015 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2016 | /* Loop until we find a non-zero width or height pass */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2017 | do |
| 2018 | { |
| 2019 | png_ptr->pass++; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2020 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2021 | if (png_ptr->pass >= 7) |
| 2022 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2023 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2024 | png_ptr->usr_width = (png_ptr->width + |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2025 | png_pass_inc[png_ptr->pass] - 1 - |
| 2026 | png_pass_start[png_ptr->pass]) / |
| 2027 | png_pass_inc[png_ptr->pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2028 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2029 | png_ptr->num_rows = (png_ptr->height + |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2030 | png_pass_yinc[png_ptr->pass] - 1 - |
| 2031 | png_pass_ystart[png_ptr->pass]) / |
| 2032 | png_pass_yinc[png_ptr->pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2033 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2034 | if ((png_ptr->transformations & PNG_INTERLACE) != 0) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2035 | break; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2036 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2037 | } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); |
| 2038 | |
| 2039 | } |
| 2040 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2041 | /* Reset the row above the image for the next pass */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2042 | if (png_ptr->pass < 7) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2043 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2044 | if (png_ptr->prev_row != NULL) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2045 | memset(png_ptr->prev_row, 0, |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2046 | (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* |
| 2047 | png_ptr->usr_bit_depth, png_ptr->width)) + 1); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2048 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2049 | return; |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2050 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2051 | } |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2052 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2053 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2054 | /* If we get here, we've just written the last row, so we need |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2055 | to flush the compressor */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2056 | png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2057 | } |
| 2058 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2059 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2060 | /* Pick out the correct pixels for the interlace pass. |
| 2061 | * The basic idea here is to go through the row with a source |
| 2062 | * pointer and a destination pointer (sp and dp), and copy the |
| 2063 | * correct pixels for the pass. As the row gets compacted, |
| 2064 | * sp will always be >= dp, so we should never overwrite anything. |
| 2065 | * See the default: case for the easiest code to understand. |
| 2066 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2067 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2068 | png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2069 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2070 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2071 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2072 | /* Start of interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2073 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2074 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2075 | /* Offset to next interlace block */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2076 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2077 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2078 | png_debug(1, "in png_do_write_interlace"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 2079 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2080 | /* We don't have to do anything on the last pass (6) */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2081 | if (pass < 6) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2082 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2083 | /* Each pixel depth is handled separately */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2084 | switch (row_info->pixel_depth) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2085 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2086 | case 1: |
| 2087 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2088 | png_bytep sp; |
| 2089 | png_bytep dp; |
John Bowler | b780eba | 2015-06-03 14:46:34 -0500 | [diff] [blame] | 2090 | unsigned int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2091 | int d; |
| 2092 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2093 | png_uint_32 i; |
| 2094 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2095 | |
| 2096 | dp = row; |
| 2097 | d = 0; |
| 2098 | shift = 7; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2099 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2100 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2101 | i += png_pass_inc[pass]) |
| 2102 | { |
| 2103 | sp = row + (png_size_t)(i >> 3); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2104 | value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2105 | d |= (value << shift); |
| 2106 | |
| 2107 | if (shift == 0) |
| 2108 | { |
| 2109 | shift = 7; |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2110 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2111 | d = 0; |
| 2112 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2113 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2114 | else |
| 2115 | shift--; |
| 2116 | |
| 2117 | } |
| 2118 | if (shift != 7) |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2119 | *dp = (png_byte)d; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2120 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2121 | break; |
| 2122 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2123 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2124 | case 2: |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2125 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2126 | png_bytep sp; |
| 2127 | png_bytep dp; |
John Bowler | b780eba | 2015-06-03 14:46:34 -0500 | [diff] [blame] | 2128 | unsigned int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2129 | int d; |
| 2130 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2131 | png_uint_32 i; |
| 2132 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2133 | |
| 2134 | dp = row; |
| 2135 | shift = 6; |
| 2136 | d = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2137 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2138 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2139 | i += png_pass_inc[pass]) |
| 2140 | { |
| 2141 | sp = row + (png_size_t)(i >> 2); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2142 | value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2143 | d |= (value << shift); |
| 2144 | |
| 2145 | if (shift == 0) |
| 2146 | { |
| 2147 | shift = 6; |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2148 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2149 | d = 0; |
| 2150 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2151 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2152 | else |
| 2153 | shift -= 2; |
| 2154 | } |
| 2155 | if (shift != 6) |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2156 | *dp = (png_byte)d; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2157 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2158 | break; |
| 2159 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2160 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2161 | case 4: |
| 2162 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2163 | png_bytep sp; |
| 2164 | png_bytep dp; |
John Bowler | b780eba | 2015-06-03 14:46:34 -0500 | [diff] [blame] | 2165 | unsigned int shift; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2166 | int d; |
| 2167 | int value; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2168 | png_uint_32 i; |
| 2169 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2170 | |
| 2171 | dp = row; |
| 2172 | shift = 4; |
| 2173 | d = 0; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2174 | for (i = png_pass_start[pass]; i < row_width; |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2175 | i += png_pass_inc[pass]) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2176 | { |
| 2177 | sp = row + (png_size_t)(i >> 1); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2178 | value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2179 | d |= (value << shift); |
| 2180 | |
| 2181 | if (shift == 0) |
| 2182 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2183 | shift = 4; |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2184 | *dp++ = (png_byte)d; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2185 | d = 0; |
| 2186 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2187 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2188 | else |
| 2189 | shift -= 4; |
| 2190 | } |
| 2191 | if (shift != 4) |
Glenn Randers-Pehrson | c5370ed | 2015-03-21 11:54:32 -0500 | [diff] [blame] | 2192 | *dp = (png_byte)d; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2193 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2194 | break; |
| 2195 | } |
Glenn Randers-Pehrson | 67439c4 | 2010-08-19 07:01:09 -0500 | [diff] [blame] | 2196 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2197 | default: |
| 2198 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2199 | png_bytep sp; |
| 2200 | png_bytep dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2201 | png_uint_32 i; |
| 2202 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2203 | png_size_t pixel_bytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2204 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2205 | /* Start at the beginning */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2206 | dp = row; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2207 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2208 | /* Find out how many bytes each pixel takes up */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2209 | pixel_bytes = (row_info->pixel_depth >> 3); |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2210 | |
| 2211 | /* Loop through the row, only looking at the pixels that matter */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2212 | for (i = png_pass_start[pass]; i < row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2213 | i += png_pass_inc[pass]) |
| 2214 | { |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2215 | /* Find out where the original pixel is */ |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 2216 | sp = row + (png_size_t)i * pixel_bytes; |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2217 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2218 | /* Move the pixel */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2219 | if (dp != sp) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2220 | memcpy(dp, sp, pixel_bytes); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2221 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2222 | /* Next pixel */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2223 | dp += pixel_bytes; |
| 2224 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 2225 | break; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2226 | } |
| 2227 | } |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2228 | /* Set new row width */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2229 | row_info->width = (row_info->width + |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2230 | png_pass_inc[pass] - 1 - |
| 2231 | png_pass_start[pass]) / |
| 2232 | png_pass_inc[pass]; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 2233 | |
Glenn Randers-Pehrson | 16908a1 | 2010-03-06 07:34:28 -0600 | [diff] [blame] | 2234 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
| 2235 | row_info->width); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2236 | } |
| 2237 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2238 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2239 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2240 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2241 | /* This filters the row, chooses which filter to use, if it has not already |
| 2242 | * been specified by the application, and then writes the row out with the |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2243 | * chosen filter. |
| 2244 | */ |
Glenn Randers-Pehrson | 6ef579d | 2015-01-27 07:02:46 -0600 | [diff] [blame] | 2245 | static void /* PRIVATE */ |
Glenn Randers-Pehrson | 24afd07 | 2014-03-05 16:55:19 -0600 | [diff] [blame] | 2246 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2247 | png_size_t row_bytes); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 2248 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2249 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
| 2250 | static png_size_t /* PRIVATE */ |
| 2251 | png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2252 | const png_size_t row_bytes, const png_size_t lmins) |
| 2253 | { |
| 2254 | png_bytep rp, dp, lp; |
| 2255 | png_size_t i; |
| 2256 | png_size_t sum = 0; |
| 2257 | int v; |
| 2258 | |
| 2259 | png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB; |
| 2260 | |
| 2261 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1; i < bpp; |
| 2262 | i++, rp++, dp++) |
| 2263 | { |
| 2264 | v = *dp = *rp; |
| 2265 | sum += (v < 128) ? v : 256 - v; |
| 2266 | } |
| 2267 | |
| 2268 | for (lp = png_ptr->row_buf + 1; i < row_bytes; |
| 2269 | i++, rp++, lp++, dp++) |
| 2270 | { |
| 2271 | v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
| 2272 | sum += (v < 128) ? v : 256 - v; |
| 2273 | |
| 2274 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2275 | break; |
| 2276 | } |
| 2277 | |
| 2278 | return (sum); |
| 2279 | } |
| 2280 | |
| 2281 | static png_size_t /* PRIVATE */ |
| 2282 | png_setup_up_row(png_structrp png_ptr, const png_size_t row_bytes, |
| 2283 | const png_size_t lmins) |
| 2284 | { |
| 2285 | png_bytep rp, dp, pp; |
| 2286 | png_size_t i; |
| 2287 | png_size_t sum = 0; |
| 2288 | int v; |
| 2289 | |
| 2290 | png_ptr->try_row[0] = PNG_FILTER_VALUE_UP; |
| 2291 | |
| 2292 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2293 | pp = png_ptr->prev_row + 1; i < row_bytes; |
| 2294 | i++, rp++, pp++, dp++) |
| 2295 | { |
| 2296 | v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); |
| 2297 | sum += (v < 128) ? v : 256 - v; |
| 2298 | |
| 2299 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2300 | break; |
| 2301 | } |
| 2302 | |
| 2303 | return (sum); |
| 2304 | } |
| 2305 | |
| 2306 | static png_size_t /* PRIVATE */ |
| 2307 | png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2308 | const png_size_t row_bytes, const png_size_t lmins) |
| 2309 | { |
| 2310 | png_bytep rp, dp, pp, lp; |
| 2311 | png_uint_32 i; |
| 2312 | png_size_t sum = 0; |
| 2313 | int v; |
| 2314 | |
| 2315 | png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG; |
| 2316 | |
| 2317 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2318 | pp = png_ptr->prev_row + 1; i < bpp; i++) |
| 2319 | { |
| 2320 | v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
| 2321 | |
| 2322 | sum += (v < 128) ? v : 256 - v; |
| 2323 | } |
| 2324 | |
| 2325 | for (lp = png_ptr->row_buf + 1; i < row_bytes; i++) |
| 2326 | { |
| 2327 | v = *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) |
| 2328 | & 0xff); |
| 2329 | |
| 2330 | sum += (v < 128) ? v : 256 - v; |
| 2331 | |
| 2332 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2333 | break; |
| 2334 | } |
| 2335 | |
| 2336 | return (sum); |
| 2337 | } |
| 2338 | |
| 2339 | static png_size_t /* PRIVATE */ |
| 2340 | png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2341 | const png_size_t row_bytes, const png_size_t lmins) |
| 2342 | { |
| 2343 | png_bytep rp, dp, pp, cp, lp; |
| 2344 | png_size_t i; |
| 2345 | png_size_t sum = 0; |
| 2346 | int v; |
| 2347 | |
| 2348 | png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH; |
| 2349 | |
| 2350 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2351 | pp = png_ptr->prev_row + 1; i < bpp; i++) |
| 2352 | { |
| 2353 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
| 2354 | |
| 2355 | sum += (v < 128) ? v : 256 - v; |
| 2356 | } |
| 2357 | |
| 2358 | for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes; |
| 2359 | i++) |
| 2360 | { |
| 2361 | int a, b, c, pa, pb, pc, p; |
| 2362 | |
| 2363 | b = *pp++; |
| 2364 | c = *cp++; |
| 2365 | a = *lp++; |
| 2366 | |
| 2367 | p = b - c; |
| 2368 | pc = a - c; |
| 2369 | |
| 2370 | #ifdef PNG_USE_ABS |
| 2371 | pa = abs(p); |
| 2372 | pb = abs(pc); |
| 2373 | pc = abs(p + pc); |
| 2374 | #else |
| 2375 | pa = p < 0 ? -p : p; |
| 2376 | pb = pc < 0 ? -pc : pc; |
| 2377 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
| 2378 | #endif |
| 2379 | |
| 2380 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2381 | |
| 2382 | v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
| 2383 | |
| 2384 | sum += (v < 128) ? v : 256 - v; |
| 2385 | |
| 2386 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2387 | break; |
| 2388 | } |
| 2389 | |
| 2390 | return (sum); |
| 2391 | } |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2392 | #endif /* WRITE_FILTER */ |
| 2393 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2394 | void /* PRIVATE */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2395 | png_write_find_filter(png_structrp png_ptr, png_row_infop row_info) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2396 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2397 | #ifndef PNG_WRITE_FILTER_SUPPORTED |
| 2398 | png_write_filtered_row(png_ptr, png_ptr->row_buf, row_info->rowbytes+1); |
| 2399 | #else |
John Bowler | 9c04f57 | 2016-06-19 18:01:33 -0500 | [diff] [blame] | 2400 | unsigned int filter_to_do = png_ptr->do_filter; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2401 | png_bytep row_buf; |
| 2402 | png_bytep best_row; |
| 2403 | png_uint_32 bpp; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2404 | png_size_t mins; |
| 2405 | png_size_t row_bytes = row_info->rowbytes; |
Glenn Randers-Pehrson | 9d8b41e | 2009-07-19 14:45:43 -0500 | [diff] [blame] | 2406 | |
| 2407 | png_debug(1, "in png_write_find_filter"); |
| 2408 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 2409 | /* Find out how many bytes offset each pixel is */ |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2410 | bpp = (row_info->pixel_depth + 7) >> 3; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2411 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2412 | row_buf = png_ptr->row_buf; |
| 2413 | mins = PNG_SIZE_MAX - 256/* so we can detect potential overflow of the |
| 2414 | running sum */; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2415 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2416 | /* The prediction method we use is to find which method provides the |
| 2417 | * smallest value when summing the absolute values of the distances |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2418 | * from zero, using anything >= 128 as negative numbers. This is known |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2419 | * as the "minimum sum of absolute differences" heuristic. Other |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2420 | * heuristics are the "weighted minimum sum of absolute differences" |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2421 | * (experimental and can in theory improve compression), and the "zlib |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2422 | * predictive" method (not implemented yet), which does test compressions |
| 2423 | * of lines using different filter methods, and then chooses the |
| 2424 | * (series of) filter(s) that give minimum compressed data size (VERY |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2425 | * computationally expensive). |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2426 | * |
| 2427 | * GRR 980525: consider also |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2428 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2429 | * (1) minimum sum of absolute differences from running average (i.e., |
| 2430 | * keep running sum of non-absolute differences & count of bytes) |
| 2431 | * [track dispersion, too? restart average if dispersion too large?] |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2432 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2433 | * (1b) minimum sum of absolute differences from sliding average, probably |
| 2434 | * with window size <= deflate window (usually 32K) |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame] | 2435 | * |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2436 | * (2) minimum sum of squared differences from zero or running average |
| 2437 | * (i.e., ~ root-mean-square approach) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2438 | */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2439 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2440 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2441 | /* We don't need to test the 'no filter' case if this is the only filter |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2442 | * that has been chosen, as it doesn't actually do anything to the data. |
| 2443 | */ |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2444 | best_row = png_ptr->row_buf; |
| 2445 | |
John Bowler | 9c04f57 | 2016-06-19 18:01:33 -0500 | [diff] [blame] | 2446 | if (PNG_SIZE_MAX/128 <= row_bytes) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2447 | { |
John Bowler | 9c04f57 | 2016-06-19 18:01:33 -0500 | [diff] [blame] | 2448 | /* Overflow can occur in the calculation, just select the lowest set |
| 2449 | * filter. |
| 2450 | */ |
Glenn Randers-Pehrson | 4b4a958 | 2016-06-23 10:58:24 -0500 | [diff] [blame] | 2451 | filter_to_do &= -filter_to_do; |
John Bowler | 9c04f57 | 2016-06-19 18:01:33 -0500 | [diff] [blame] | 2452 | } |
| 2453 | else if ((filter_to_do & PNG_FILTER_NONE) != 0 && |
| 2454 | filter_to_do != PNG_FILTER_NONE) |
| 2455 | { |
| 2456 | /* Overflow not possible and multiple filters in the list, including the |
| 2457 | * 'none' filter. |
| 2458 | */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2459 | png_bytep rp; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2460 | png_size_t sum = 0; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 2461 | png_size_t i; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2462 | int v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2463 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2464 | { |
| 2465 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
| 2466 | { |
| 2467 | v = *rp; |
| 2468 | sum += (v < 128) ? v : 256 - v; |
| 2469 | } |
| 2470 | } |
| 2471 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2472 | mins = sum; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2473 | } |
| 2474 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2475 | /* Sub filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2476 | if (filter_to_do == PNG_FILTER_SUB) |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2477 | /* It's the only filter so no testing is needed */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2478 | { |
Glenn Randers-Pehrson | 147dc56 | 2016-06-19 22:20:52 -0500 | [diff] [blame] | 2479 | /* Passing PNG_SIZE_MAX here and below prevents the 'setup' function |
Glenn Randers-Pehrson | 4b4a958 | 2016-06-23 10:58:24 -0500 | [diff] [blame] | 2480 | * breaking out of the loop when lmins is exceeded. Optimizing |
| 2481 | * compilers should notice that we don't use the returned sum, and |
| 2482 | * therefore 'setup' should refrain from calculating and returning "sum". |
Glenn Randers-Pehrson | 147dc56 | 2016-06-19 22:20:52 -0500 | [diff] [blame] | 2483 | */ |
| 2484 | (void) png_setup_sub_row(png_ptr, bpp, row_bytes, PNG_SIZE_MAX); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2485 | best_row = png_ptr->try_row; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2486 | } |
| 2487 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2488 | else if ((filter_to_do & PNG_FILTER_SUB) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2489 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2490 | png_size_t sum; |
| 2491 | png_size_t lmins = mins; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2492 | |
Glenn Randers-Pehrson | 92ec30a | 2015-11-24 07:34:37 -0600 | [diff] [blame] | 2493 | sum = png_setup_sub_row(png_ptr, bpp, row_bytes, lmins); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2494 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2495 | if (sum < mins) |
| 2496 | { |
| 2497 | mins = sum; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2498 | best_row = png_ptr->try_row; |
| 2499 | if (png_ptr->tst_row != NULL) |
| 2500 | { |
| 2501 | png_ptr->try_row = png_ptr->tst_row; |
| 2502 | png_ptr->tst_row = best_row; |
| 2503 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2504 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2505 | } |
| 2506 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2507 | /* Up filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2508 | if (filter_to_do == PNG_FILTER_UP) |
| 2509 | { |
Glenn Randers-Pehrson | 147dc56 | 2016-06-19 22:20:52 -0500 | [diff] [blame] | 2510 | (void) png_setup_up_row(png_ptr, row_bytes, PNG_SIZE_MAX); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2511 | best_row = png_ptr->try_row; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2512 | } |
| 2513 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2514 | else if ((filter_to_do & PNG_FILTER_UP) != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2515 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2516 | png_size_t sum; |
| 2517 | png_size_t lmins = mins; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2518 | |
Glenn Randers-Pehrson | 92ec30a | 2015-11-24 07:34:37 -0600 | [diff] [blame] | 2519 | sum = png_setup_up_row(png_ptr, row_bytes, lmins); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2520 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2521 | if (sum < mins) |
| 2522 | { |
| 2523 | mins = sum; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2524 | best_row = png_ptr->try_row; |
| 2525 | if (png_ptr->tst_row != NULL) |
| 2526 | { |
| 2527 | png_ptr->try_row = png_ptr->tst_row; |
| 2528 | png_ptr->tst_row = best_row; |
| 2529 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2530 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2531 | } |
| 2532 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2533 | /* Avg filter */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2534 | if (filter_to_do == PNG_FILTER_AVG) |
| 2535 | { |
Glenn Randers-Pehrson | 147dc56 | 2016-06-19 22:20:52 -0500 | [diff] [blame] | 2536 | (void) png_setup_avg_row(png_ptr, bpp, row_bytes, PNG_SIZE_MAX); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2537 | best_row = png_ptr->try_row; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2538 | } |
| 2539 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2540 | else if ((filter_to_do & PNG_FILTER_AVG) != 0) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2541 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2542 | png_size_t sum; |
| 2543 | png_size_t lmins = mins; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2544 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2545 | sum= png_setup_avg_row(png_ptr, bpp, row_bytes, lmins); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2546 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2547 | if (sum < mins) |
| 2548 | { |
| 2549 | mins = sum; |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2550 | best_row = png_ptr->try_row; |
| 2551 | if (png_ptr->tst_row != NULL) |
| 2552 | { |
| 2553 | png_ptr->try_row = png_ptr->tst_row; |
| 2554 | png_ptr->tst_row = best_row; |
| 2555 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2556 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2557 | } |
| 2558 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2559 | /* Paeth filter */ |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2560 | if ((filter_to_do == PNG_FILTER_PAETH) != 0) |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2561 | { |
Glenn Randers-Pehrson | 147dc56 | 2016-06-19 22:20:52 -0500 | [diff] [blame] | 2562 | (void) png_setup_paeth_row(png_ptr, bpp, row_bytes, PNG_SIZE_MAX); |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2563 | best_row = png_ptr->try_row; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2564 | } |
| 2565 | |
Glenn Randers-Pehrson | 5d713fe | 2014-10-31 20:48:55 -0500 | [diff] [blame] | 2566 | else if ((filter_to_do & PNG_FILTER_PAETH) != 0) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2567 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2568 | png_size_t sum; |
| 2569 | png_size_t lmins = mins; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2570 | |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2571 | sum = png_setup_paeth_row(png_ptr, bpp, row_bytes, lmins); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2572 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2573 | if (sum < mins) |
| 2574 | { |
Glenn Randers-Pehrson | e687767 | 2015-05-30 11:54:45 -0500 | [diff] [blame] | 2575 | best_row = png_ptr->try_row; |
| 2576 | if (png_ptr->tst_row != NULL) |
| 2577 | { |
| 2578 | png_ptr->try_row = png_ptr->tst_row; |
| 2579 | png_ptr->tst_row = best_row; |
| 2580 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2581 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2582 | } |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 2583 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2584 | /* Do the actual writing of the filtered row data from the chosen filter. */ |
| 2585 | png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2586 | |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 2587 | #endif /* WRITE_FILTER */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2591 | /* Do the actual writing of a previously filtered row. */ |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 2592 | static void |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2593 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2594 | png_size_t full_row_length/*includes filter byte*/) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2595 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2596 | png_debug(1, "in png_write_filtered_row"); |
Glenn Randers-Pehrson | 3358a98 | 2009-08-13 18:04:26 -0500 | [diff] [blame] | 2597 | |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 2598 | png_debug1(2, "filter = %d", filtered_row[0]); |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2599 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2600 | png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2601 | |
Glenn Randers-Pehrson | 6ef579d | 2015-01-27 07:02:46 -0600 | [diff] [blame] | 2602 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2603 | /* Swap the current and previous rows */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2604 | if (png_ptr->prev_row != NULL) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2605 | { |
| 2606 | png_bytep tptr; |
| 2607 | |
| 2608 | tptr = png_ptr->prev_row; |
| 2609 | png_ptr->prev_row = png_ptr->row_buf; |
| 2610 | png_ptr->row_buf = tptr; |
| 2611 | } |
Glenn Randers-Pehrson | 6ef579d | 2015-01-27 07:02:46 -0600 | [diff] [blame] | 2612 | #endif /* WRITE_FILTER */ |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 2613 | |
Glenn Randers-Pehrson glennrp@comcast.net | b1c0d33 | 2009-05-15 20:39:34 -0500 | [diff] [blame] | 2614 | /* Finish row - updates counters and flushes zlib if last row */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2615 | png_write_finish_row(png_ptr); |
| 2616 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 2617 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2618 | png_ptr->flush_rows++; |
| 2619 | |
| 2620 | if (png_ptr->flush_dist > 0 && |
| 2621 | png_ptr->flush_rows >= png_ptr->flush_dist) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2622 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2623 | png_write_flush(png_ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2624 | } |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 2625 | #endif /* WRITE_FLUSH */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2626 | } |
Glenn Randers-Pehrson | cda68df | 2014-11-06 22:11:39 -0600 | [diff] [blame] | 2627 | #endif /* WRITE */ |