| /* |
| * jpegdata.h |
| * |
| * Copyright (C) 1991, 1992, Thomas G. Lane. |
| * This file is part of the Independent JPEG Group's software. |
| * For conditions of distribution and use, see the accompanying README file. |
| * |
| * This file defines shared data structures for the various JPEG modules. |
| */ |
| |
| |
| /* |
| * You might need to change some of the following declarations if you are |
| * using the JPEG software within a surrounding application program |
| * or porting it to an unusual system. |
| */ |
| |
| |
| /* If the source or destination of image data is not to be stdio streams, |
| * these types may need work. You can replace them with some kind of |
| * pointer or indicator that is useful to you, or just ignore 'em. |
| * Note that the user interface and the various jrdxxx/jwrxxx modules |
| * will also need work for non-stdio input/output. |
| */ |
| |
| typedef FILE * JFILEREF; /* source or dest of JPEG-compressed data */ |
| |
| typedef FILE * IFILEREF; /* source or dest of non-JPEG image data */ |
| |
| |
| /* These defines are used in all function definitions and extern declarations. |
| * You could modify them if you need to change function linkage conventions, |
| * as is shown below for use with C++. Another application would be to make |
| * all functions global for use with code profilers that require it. |
| * NOTE: the C++ test does the right thing if you are reading this include |
| * file in a C++ application to link to JPEG code that's been compiled with a |
| * regular C compiler. I'm not sure it works if you try to compile the JPEG |
| * code with C++. |
| */ |
| |
| #define METHODDEF static /* a function called through method pointers */ |
| #define LOCAL static /* a function used only in its module */ |
| #define GLOBAL /* a function referenced thru EXTERNs */ |
| #ifdef __cplusplus |
| #define EXTERN extern "C" /* a reference to a GLOBAL function */ |
| #else |
| #define EXTERN extern /* a reference to a GLOBAL function */ |
| #endif |
| |
| |
| /* Here is the pseudo-keyword for declaring pointers that must be "far" |
| * on 80x86 machines. Most of the specialized coding for 80x86 is handled |
| * by just saying "FAR *" where such a pointer is needed. In a few places |
| * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol. |
| */ |
| |
| #ifdef NEED_FAR_POINTERS |
| #define FAR far |
| #else |
| #define FAR |
| #endif |
| |
| |
| |
| /* The remaining declarations are not system-dependent, we hope. */ |
| |
| |
| /* |
| * NOTE: if you have an ancient, strict-K&R C compiler, it may choke on the |
| * similarly-named fields in compress_info_struct and decompress_info_struct. |
| * If this happens, you can get around it by rearranging the two structs so |
| * that the similarly-named fields appear first and in the same order in |
| * each struct. Since such compilers are now pretty rare, we haven't done |
| * this in the portable code, preferring to maintain a logical ordering. |
| */ |
| |
| |
| |
| /* This macro is used to declare a "method", that is, a function pointer. */ |
| /* We want to supply prototype parameters if the compiler can cope. */ |
| /* Note that the arglist parameter must be parenthesized! */ |
| |
| #ifdef PROTO |
| #define METHOD(type,methodname,arglist) type (*methodname) arglist |
| #else |
| #define METHOD(type,methodname,arglist) type (*methodname) () |
| #endif |
| |
| /* Forward references to lists of method pointers */ |
| typedef struct external_methods_struct * external_methods_ptr; |
| typedef struct compress_methods_struct * compress_methods_ptr; |
| typedef struct decompress_methods_struct * decompress_methods_ptr; |
| |
| |
| /* Data structures for images containing either samples or coefficients. */ |
| /* Note that the topmost (leftmost) index is always color component. */ |
| /* On 80x86 machines, the image arrays are too big for near pointers, */ |
| /* but the pointer arrays can fit in near memory. */ |
| |
| typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ |
| typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ |
| typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ |
| |
| |
| #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ |
| #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ |
| |
| typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ |
| typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ |
| typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ |
| typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ |
| |
| typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ |
| |
| |
| /* The input and output data of the DCT transform subroutines are of |
| * the following type, which need not be the same as JCOEF. |
| * For example, on a machine with fast floating point, it might make sense |
| * to recode the DCT routines to use floating point; then DCTELEM would be |
| * 'float' or 'double'. |
| */ |
| |
| typedef JCOEF DCTELEM; |
| typedef DCTELEM DCTBLOCK[DCTSIZE2]; |
| |
| |
| /* Types for JPEG compression parameters and working tables. */ |
| |
| |
| typedef enum { /* defines known color spaces */ |
| CS_UNKNOWN, /* error/unspecified */ |
| CS_GRAYSCALE, /* monochrome (only 1 component) */ |
| CS_RGB, /* red/green/blue */ |
| CS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ |
| CS_YIQ, /* Y/I/Q */ |
| CS_CMYK /* C/M/Y/K */ |
| } COLOR_SPACE; |
| |
| |
| typedef struct { /* Basic info about one component */ |
| /* These values are fixed over the whole image */ |
| /* For compression, they must be supplied by the user interface; */ |
| /* for decompression, they are read from the SOF marker. */ |
| short component_id; /* identifier for this component (0..255) */ |
| short component_index; /* its index in SOF or cinfo->comp_info[] */ |
| short h_samp_factor; /* horizontal sampling factor (1..4) */ |
| short v_samp_factor; /* vertical sampling factor (1..4) */ |
| short quant_tbl_no; /* quantization table selector (0..3) */ |
| /* These values may vary between scans */ |
| /* For compression, they must be supplied by the user interface; */ |
| /* for decompression, they are read from the SOS marker. */ |
| short dc_tbl_no; /* DC entropy table selector (0..3) */ |
| short ac_tbl_no; /* AC entropy table selector (0..3) */ |
| /* These values are computed during compression or decompression startup */ |
| long true_comp_width; /* component's image width in samples */ |
| long true_comp_height; /* component's image height in samples */ |
| /* the above are the logical dimensions of the subsampled image */ |
| /* These values are computed before starting a scan of the component */ |
| short MCU_width; /* number of blocks per MCU, horizontally */ |
| short MCU_height; /* number of blocks per MCU, vertically */ |
| short MCU_blocks; /* MCU_width * MCU_height */ |
| long subsampled_width; /* image width in samples, after expansion */ |
| long subsampled_height; /* image height in samples, after expansion */ |
| /* the above are the true_comp_xxx values rounded up to multiples of */ |
| /* the MCU dimensions; these are the working dimensions of the array */ |
| /* as it is passed through the DCT or IDCT step. NOTE: these values */ |
| /* differ depending on whether the component is interleaved or not!! */ |
| } jpeg_component_info; |
| |
| |
| /* DCT coefficient quantization tables. |
| * For 8-bit precision, 'INT16' should be good enough for quantization values; |
| * for more precision, we go for the full 16 bits. 'INT16' provides a useful |
| * speedup on many machines (multiplication & division of JCOEFs by |
| * quantization values is a significant chunk of the runtime). |
| * Note: the values in a QUANT_TBL are always given in zigzag order. |
| */ |
| #ifdef EIGHT_BIT_SAMPLES |
| typedef INT16 QUANT_VAL; /* element of a quantization table */ |
| #else |
| typedef UINT16 QUANT_VAL; /* element of a quantization table */ |
| #endif |
| typedef QUANT_VAL QUANT_TBL[DCTSIZE2]; /* A quantization table */ |
| typedef QUANT_VAL * QUANT_TBL_PTR; /* pointer to same */ |
| |
| |
| typedef struct { /* A Huffman coding table */ |
| /* These two fields directly represent the contents of a JPEG DHT marker */ |
| UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ |
| /* length k bits; bits[0] is unused */ |
| UINT8 huffval[256]; /* The symbols, in order of incr code length */ |
| /* This field is used only during compression. It's initialized FALSE when |
| * the table is created, and set TRUE when it's been output to the file. |
| */ |
| boolean sent_table; /* TRUE when table has been output */ |
| /* The remaining fields are computed from the above to allow more efficient |
| * coding and decoding. These fields should be considered private to the |
| * Huffman compression & decompression modules. |
| */ |
| /* encoding tables: */ |
| UINT16 ehufco[256]; /* code for each symbol */ |
| char ehufsi[256]; /* length of code for each symbol */ |
| /* decoding tables: (element [0] of each array is unused) */ |
| UINT16 mincode[17]; /* smallest code of length k */ |
| INT32 maxcode[18]; /* largest code of length k (-1 if none) */ |
| /* (maxcode[17] is a sentinel to ensure huff_DECODE terminates) */ |
| short valptr[17]; /* huffval[] index of 1st symbol of length k */ |
| } HUFF_TBL; |
| |
| |
| #define NUM_QUANT_TBLS 4 /* quantization tables are numbered 0..3 */ |
| #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ |
| #define NUM_ARITH_TBLS 16 /* arith-coding tables are numbered 0..15 */ |
| #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ |
| #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ |
| #define MAX_BLOCKS_IN_MCU 10 /* JPEG limit on # of blocks in an MCU */ |
| |
| |
| /* Working data for compression */ |
| |
| struct compress_info_struct { |
| /* |
| * All of these fields shall be established by the user interface before |
| * calling jpeg_compress, or by the input_init or c_ui_method_selection |
| * methods. |
| * Most parameters can be set to reasonable defaults by j_c_defaults. |
| * Note that the UI must supply the storage for the main methods struct, |
| * though it sets only a few of the methods there. |
| */ |
| compress_methods_ptr methods; /* Points to list of methods to use */ |
| |
| external_methods_ptr emethods; /* Points to list of methods to use */ |
| |
| IFILEREF input_file; /* tells input routines where to read image */ |
| JFILEREF output_file; /* tells output routines where to write JPEG */ |
| |
| long image_width; /* input image width */ |
| long image_height; /* input image height */ |
| short input_components; /* # of color components in input image */ |
| |
| short data_precision; /* bits of precision in image data */ |
| |
| COLOR_SPACE in_color_space; /* colorspace of input file */ |
| COLOR_SPACE jpeg_color_space; /* colorspace of JPEG file */ |
| |
| double input_gamma; /* image gamma of input file */ |
| |
| boolean write_JFIF_header; /* should a JFIF marker be written? */ |
| /* These three values are not used by the JPEG code, only copied */ |
| /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ |
| /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ |
| /* ratio is defined by X_density/Y_density even when density_unit=0. */ |
| UINT8 density_unit; /* JFIF code for pixel size units */ |
| UINT16 X_density; /* Horizontal pixel density */ |
| UINT16 Y_density; /* Vertical pixel density */ |
| |
| short num_components; /* # of color components in JPEG image */ |
| jpeg_component_info * comp_info; |
| /* comp_info[i] describes component that appears i'th in SOF */ |
| |
| QUANT_TBL_PTR quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| |
| HUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| HUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| /* ptrs to Huffman coding tables, or NULL if not defined */ |
| |
| UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arithmetic-coding tables */ |
| UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arithmetic-coding tables */ |
| UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arithmetic-coding tables */ |
| |
| boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| boolean interleave; /* TRUE=interleaved output, FALSE=not */ |
| boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ |
| boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| |
| UINT16 restart_interval;/* MDUs per restart interval, or 0 for no restart */ |
| |
| /* |
| * These fields are computed during jpeg_compress startup |
| */ |
| short max_h_samp_factor; /* largest h_samp_factor */ |
| short max_v_samp_factor; /* largest v_samp_factor */ |
| |
| /* |
| * These fields may be useful for progress monitoring |
| */ |
| |
| int total_passes; /* number of passes expected */ |
| int completed_passes; /* number of passes completed so far */ |
| |
| /* |
| * These fields are valid during any one scan |
| */ |
| short comps_in_scan; /* # of JPEG components output this time */ |
| jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| |
| long MCUs_per_row; /* # of MCUs across the image */ |
| long MCU_rows_in_scan; /* # of MCU rows in the image */ |
| |
| short blocks_in_MCU; /* # of DCT blocks per MCU */ |
| short MCU_membership[MAX_BLOCKS_IN_MCU]; |
| /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| /* i'th block in an MCU */ |
| |
| /* these fields are private data for the entropy encoder */ |
| JCOEF last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each comp */ |
| JCOEF last_dc_diff[MAX_COMPS_IN_SCAN]; /* last DC diff for each comp */ |
| UINT16 restarts_to_go; /* MDUs left in this restart interval */ |
| short next_restart_num; /* # of next RSTn marker (0..7) */ |
| }; |
| |
| typedef struct compress_info_struct * compress_info_ptr; |
| |
| |
| /* Working data for decompression */ |
| |
| struct decompress_info_struct { |
| /* |
| * These fields shall be established by the user interface before |
| * calling jpeg_decompress. |
| * Most parameters can be set to reasonable defaults by j_d_defaults. |
| * Note that the UI must supply the storage for the main methods struct, |
| * though it sets only a few of the methods there. |
| */ |
| decompress_methods_ptr methods; /* Points to list of methods to use */ |
| |
| external_methods_ptr emethods; /* Points to list of methods to use */ |
| |
| JFILEREF input_file; /* tells input routines where to read JPEG */ |
| IFILEREF output_file; /* tells output routines where to write image */ |
| |
| /* these can be set at d_ui_method_selection time: */ |
| |
| COLOR_SPACE out_color_space; /* colorspace of output */ |
| |
| double output_gamma; /* image gamma wanted in output */ |
| |
| boolean quantize_colors; /* T if output is a colormapped format */ |
| /* the following are ignored if not quantize_colors: */ |
| boolean two_pass_quantize; /* use two-pass color quantization? */ |
| boolean use_dithering; /* want color dithering? */ |
| int desired_number_of_colors; /* max number of colors to use */ |
| |
| boolean do_block_smoothing; /* T = apply cross-block smoothing */ |
| boolean do_pixel_smoothing; /* T = apply post-subsampling smoothing */ |
| |
| /* |
| * These fields are used for efficient buffering of data between read_jpeg_data |
| * and the entropy decoding object. By using a shared buffer, we avoid copying |
| * data and eliminate the need for an "unget" operation at the end of a scan. |
| * The actual source of the data is known only to read_jpeg_data; see the |
| * JGETC macro, below. |
| * Note: the user interface is expected to allocate the input_buffer and |
| * initialize bytes_in_buffer to 0. Also, for JFIF/raw-JPEG input, the UI |
| * actually supplies the read_jpeg_data method. This is all handled by |
| * j_d_defaults in a typical implementation. |
| */ |
| char * input_buffer; /* start of buffer (private to input code) */ |
| char * next_input_byte; /* => next byte to read from buffer */ |
| int bytes_in_buffer; /* # of bytes remaining in buffer */ |
| |
| /* |
| * These fields are set by read_file_header or read_scan_header |
| */ |
| long image_width; /* overall image width */ |
| long image_height; /* overall image height */ |
| |
| short data_precision; /* bits of precision in image data */ |
| |
| COLOR_SPACE jpeg_color_space; /* colorspace of JPEG file */ |
| |
| /* These three values are not used by the JPEG code, merely copied */ |
| /* from the JFIF APP0 marker (if any). */ |
| UINT8 density_unit; /* JFIF code for pixel size units */ |
| UINT16 X_density; /* Horizontal pixel density */ |
| UINT16 Y_density; /* Vertical pixel density */ |
| |
| short num_components; /* # of color components in JPEG image */ |
| jpeg_component_info * comp_info; |
| /* comp_info[i] describes component that appears i'th in SOF */ |
| |
| QUANT_TBL_PTR quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| |
| HUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| HUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| /* ptrs to Huffman coding tables, or NULL if not defined */ |
| |
| UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| |
| boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| |
| UINT16 restart_interval;/* MDUs per restart interval, or 0 for no restart */ |
| |
| /* |
| * These fields are computed during jpeg_decompress startup |
| */ |
| short max_h_samp_factor; /* largest h_samp_factor */ |
| short max_v_samp_factor; /* largest v_samp_factor */ |
| |
| short color_out_comps; /* # of color components output by color_convert */ |
| /* (need not match num_components) */ |
| short final_out_comps; /* # of color components sent to put_pixel_rows */ |
| /* (1 when quantizing colors, else same as color_out_comps) */ |
| |
| /* |
| * When quantizing colors, the color quantizer leaves a pointer to the output |
| * colormap in these fields. The colormap is valid from the time put_color_map |
| * is called (must be before any put_pixel_rows calls) until shutdown (more |
| * specifically, until free_all is called to release memory). |
| */ |
| int actual_number_of_colors; /* actual number of entries */ |
| JSAMPARRAY colormap; /* NULL if not valid */ |
| /* map has color_out_comps rows * actual_number_of_colors columns */ |
| |
| /* |
| * These fields may be useful for progress monitoring |
| */ |
| |
| int total_passes; /* number of passes expected */ |
| int completed_passes; /* number of passes completed so far */ |
| |
| /* |
| * These fields are valid during any one scan |
| */ |
| short comps_in_scan; /* # of JPEG components input this time */ |
| jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| |
| long MCUs_per_row; /* # of MCUs across the image */ |
| long MCU_rows_in_scan; /* # of MCU rows in the image */ |
| |
| short blocks_in_MCU; /* # of DCT blocks per MCU */ |
| short MCU_membership[MAX_BLOCKS_IN_MCU]; |
| /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| /* i'th block in an MCU */ |
| |
| /* these fields are private data for the entropy encoder */ |
| JCOEF last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each comp */ |
| JCOEF last_dc_diff[MAX_COMPS_IN_SCAN]; /* last DC diff for each comp */ |
| UINT16 restarts_to_go; /* MDUs left in this restart interval */ |
| short next_restart_num; /* # of next RSTn marker (0..7) */ |
| }; |
| |
| typedef struct decompress_info_struct * decompress_info_ptr; |
| |
| |
| /* Macros for reading data from the decompression input buffer */ |
| |
| #ifdef CHAR_IS_UNSIGNED |
| #define JGETC(cinfo) ( --(cinfo)->bytes_in_buffer < 0 ? \ |
| (*(cinfo)->methods->read_jpeg_data) (cinfo) : \ |
| (int) (*(cinfo)->next_input_byte++) ) |
| #else |
| #define JGETC(cinfo) ( --(cinfo)->bytes_in_buffer < 0 ? \ |
| (*(cinfo)->methods->read_jpeg_data) (cinfo) : \ |
| (int) (*(cinfo)->next_input_byte++) & 0xFF ) |
| #endif |
| |
| #define JUNGETC(ch,cinfo) ((cinfo)->bytes_in_buffer++, \ |
| *(--((cinfo)->next_input_byte)) = (ch)) |
| |
| #define MIN_UNGET 4 /* may always do at least 4 JUNGETCs */ |
| |
| |
| /* A virtual image has a control block whose contents are private to the |
| * memory manager module (and may differ between managers). The rest of the |
| * code only refers to virtual images by these pointer types, and never |
| * dereferences the pointer. |
| */ |
| |
| typedef struct big_sarray_control * big_sarray_ptr; |
| typedef struct big_barray_control * big_barray_ptr; |
| |
| /* Although a real ANSI C compiler can deal perfectly well with pointers to |
| * unspecified structures (see "incomplete types" in the spec), a few pre-ANSI |
| * and pseudo-ANSI compilers get confused. To keep one of these bozos happy, |
| * add -DINCOMPLETE_TYPES_BROKEN to CFLAGS in your Makefile. Then we will |
| * pseudo-define the structs as containing a single "dummy" field. |
| * The memory managers #define AM_MEMORY_MANAGER before including this file, |
| * so that they can make their own definitions of the structs. |
| */ |
| |
| #ifdef INCOMPLETE_TYPES_BROKEN |
| #ifndef AM_MEMORY_MANAGER |
| struct big_sarray_control { long dummy; }; |
| struct big_barray_control { long dummy; }; |
| #endif |
| #endif |
| |
| |
| /* Method types that need typedefs */ |
| |
| typedef METHOD(void, MCU_output_method_ptr, (compress_info_ptr cinfo, |
| JBLOCK *MCU_data)); |
| typedef METHOD(void, MCU_output_caller_ptr, (compress_info_ptr cinfo, |
| MCU_output_method_ptr output_method)); |
| typedef METHOD(void, subsample_ptr, (compress_info_ptr cinfo, |
| int which_component, |
| long input_cols, int input_rows, |
| long output_cols, int output_rows, |
| JSAMPARRAY above, |
| JSAMPARRAY input_data, |
| JSAMPARRAY below, |
| JSAMPARRAY output_data)); |
| typedef METHOD(void, unsubsample_ptr, (decompress_info_ptr cinfo, |
| int which_component, |
| long input_cols, int input_rows, |
| long output_cols, int output_rows, |
| JSAMPARRAY above, |
| JSAMPARRAY input_data, |
| JSAMPARRAY below, |
| JSAMPARRAY output_data)); |
| typedef METHOD(void, quantize_method_ptr, (decompress_info_ptr cinfo, |
| int num_rows, |
| JSAMPIMAGE input_data, |
| JSAMPARRAY output_workspace)); |
| typedef METHOD(void, quantize_caller_ptr, (decompress_info_ptr cinfo, |
| quantize_method_ptr quantize_method)); |
| |
| |
| /* These structs contain function pointers for the various JPEG methods. */ |
| |
| /* Routines to be provided by the surrounding application, rather than the |
| * portable JPEG code proper. These are the same for compression and |
| * decompression. |
| */ |
| |
| struct external_methods_struct { |
| /* User interface: error exit and trace message routines */ |
| /* NOTE: the string msgtext parameters will eventually be replaced */ |
| /* by an enumerated-type code so that non-English error messages */ |
| /* can be substituted easily. This will not be done until all the */ |
| /* code is in place, so that we know what messages are needed. */ |
| METHOD(void, error_exit, (const char *msgtext)); |
| METHOD(void, trace_message, (const char *msgtext)); |
| |
| /* Working data for error/trace facility */ |
| /* See macros below for the usage of these variables */ |
| int trace_level; /* level of detail of tracing messages */ |
| /* Use level 0 for unsuppressable messages (nonfatal errors) */ |
| /* Use levels 1, 2, 3 for successively more detailed trace options */ |
| |
| int message_parm[8]; /* store numeric parms for messages here */ |
| |
| /* Memory management */ |
| /* NB: alloc routines never return NULL. They exit to */ |
| /* error_exit if not successful. */ |
| METHOD(void *, alloc_small, (size_t sizeofobject)); |
| METHOD(void, free_small, (void *ptr)); |
| METHOD(void FAR *, alloc_medium, (size_t sizeofobject)); |
| METHOD(void, free_medium, (void FAR *ptr)); |
| METHOD(JSAMPARRAY, alloc_small_sarray, (long samplesperrow, |
| long numrows)); |
| METHOD(void, free_small_sarray, (JSAMPARRAY ptr)); |
| METHOD(JBLOCKARRAY, alloc_small_barray, (long blocksperrow, |
| long numrows)); |
| METHOD(void, free_small_barray, (JBLOCKARRAY ptr)); |
| METHOD(big_sarray_ptr, request_big_sarray, (long samplesperrow, |
| long numrows, |
| long unitheight)); |
| METHOD(big_barray_ptr, request_big_barray, (long blocksperrow, |
| long numrows, |
| long unitheight)); |
| METHOD(void, alloc_big_arrays, (long extra_small_samples, |
| long extra_small_blocks, |
| long extra_medium_space)); |
| METHOD(JSAMPARRAY, access_big_sarray, (big_sarray_ptr ptr, |
| long start_row, |
| boolean writable)); |
| METHOD(JBLOCKARRAY, access_big_barray, (big_barray_ptr ptr, |
| long start_row, |
| boolean writable)); |
| METHOD(void, free_big_sarray, (big_sarray_ptr ptr)); |
| METHOD(void, free_big_barray, (big_barray_ptr ptr)); |
| METHOD(void, free_all, (void)); |
| |
| long max_memory_to_use; /* maximum amount of memory to use */ |
| }; |
| |
| /* Macros to simplify using the error and trace message stuff */ |
| /* The first parameter is generally cinfo->emethods */ |
| |
| #define ERREXIT(emeth,msg) ((*(emeth)->error_exit) (msg)) |
| #define ERREXIT1(emeth,msg,p1) ((emeth)->message_parm[0] = (p1), \ |
| (*(emeth)->error_exit) (msg)) |
| #define ERREXIT2(emeth,msg,p1,p2) ((emeth)->message_parm[0] = (p1), \ |
| (emeth)->message_parm[1] = (p2), \ |
| (*(emeth)->error_exit) (msg)) |
| #define ERREXIT3(emeth,msg,p1,p2,p3) ((emeth)->message_parm[0] = (p1), \ |
| (emeth)->message_parm[1] = (p2), \ |
| (emeth)->message_parm[2] = (p3), \ |
| (*(emeth)->error_exit) (msg)) |
| #define ERREXIT4(emeth,msg,p1,p2,p3,p4) ((emeth)->message_parm[0] = (p1), \ |
| (emeth)->message_parm[1] = (p2), \ |
| (emeth)->message_parm[2] = (p3), \ |
| (emeth)->message_parm[3] = (p4), \ |
| (*(emeth)->error_exit) (msg)) |
| |
| #define MAKESTMT(stuff) do { stuff } while (0) |
| |
| #define TRACEMS(emeth,lvl,msg) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| (*(emeth)->trace_message) (msg); } ) |
| #define TRACEMS1(emeth,lvl,msg,p1) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| (emeth)->message_parm[0] = (p1); \ |
| (*(emeth)->trace_message) (msg); } ) |
| #define TRACEMS2(emeth,lvl,msg,p1,p2) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| (emeth)->message_parm[0] = (p1); \ |
| (emeth)->message_parm[1] = (p2); \ |
| (*(emeth)->trace_message) (msg); } ) |
| #define TRACEMS3(emeth,lvl,msg,p1,p2,p3) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| int * _mp = (emeth)->message_parm; \ |
| *_mp++ = (p1); *_mp++ = (p2); *_mp = (p3); \ |
| (*(emeth)->trace_message) (msg); } ) |
| #define TRACEMS4(emeth,lvl,msg,p1,p2,p3,p4) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| int * _mp = (emeth)->message_parm; \ |
| *_mp++ = (p1); *_mp++ = (p2); *_mp++ = (p3); *_mp = (p4); \ |
| (*(emeth)->trace_message) (msg); } ) |
| #define TRACEMS8(emeth,lvl,msg,p1,p2,p3,p4,p5,p6,p7,p8) \ |
| MAKESTMT( if ((emeth)->trace_level >= (lvl)) { \ |
| int * _mp = (emeth)->message_parm; \ |
| *_mp++ = (p1); *_mp++ = (p2); *_mp++ = (p3); *_mp++ = (p4); \ |
| *_mp++ = (p5); *_mp++ = (p6); *_mp++ = (p7); *_mp = (p8); \ |
| (*(emeth)->trace_message) (msg); } ) |
| |
| |
| /* Methods used during JPEG compression. */ |
| |
| struct compress_methods_struct { |
| /* Hook for user interface to get control after input_init */ |
| METHOD(void, c_ui_method_selection, (compress_info_ptr cinfo)); |
| /* Hook for user interface to do progress monitoring */ |
| METHOD(void, progress_monitor, (compress_info_ptr cinfo, |
| long loopcounter, long looplimit)); |
| /* Input image reading & conversion to standard form */ |
| METHOD(void, input_init, (compress_info_ptr cinfo)); |
| METHOD(void, get_input_row, (compress_info_ptr cinfo, |
| JSAMPARRAY pixel_row)); |
| METHOD(void, input_term, (compress_info_ptr cinfo)); |
| /* Color space and gamma conversion */ |
| METHOD(void, colorin_init, (compress_info_ptr cinfo)); |
| METHOD(void, get_sample_rows, (compress_info_ptr cinfo, |
| int rows_to_read, |
| JSAMPIMAGE image_data)); |
| METHOD(void, colorin_term, (compress_info_ptr cinfo)); |
| /* Expand picture data at edges */ |
| METHOD(void, edge_expand, (compress_info_ptr cinfo, |
| long input_cols, int input_rows, |
| long output_cols, int output_rows, |
| JSAMPIMAGE image_data)); |
| /* Subsample pixel values of a single component */ |
| /* There can be a different subsample method for each component */ |
| METHOD(void, subsample_init, (compress_info_ptr cinfo)); |
| subsample_ptr subsample[MAX_COMPS_IN_SCAN]; |
| METHOD(void, subsample_term, (compress_info_ptr cinfo)); |
| /* Extract samples in MCU order, process & hand off to output_method */ |
| /* The input is always exactly N MCU rows worth of data */ |
| METHOD(void, extract_init, (compress_info_ptr cinfo)); |
| METHOD(void, extract_MCUs, (compress_info_ptr cinfo, |
| JSAMPIMAGE image_data, |
| int num_mcu_rows, |
| MCU_output_method_ptr output_method)); |
| METHOD(void, extract_term, (compress_info_ptr cinfo)); |
| /* Entropy encoding parameter optimization */ |
| METHOD(void, entropy_optimize, (compress_info_ptr cinfo, |
| MCU_output_caller_ptr source_method)); |
| /* Entropy encoding */ |
| METHOD(void, entropy_encoder_init, (compress_info_ptr cinfo)); |
| METHOD(void, entropy_encode, (compress_info_ptr cinfo, |
| JBLOCK *MCU_data)); |
| METHOD(void, entropy_encoder_term, (compress_info_ptr cinfo)); |
| /* JPEG file header construction */ |
| METHOD(void, write_file_header, (compress_info_ptr cinfo)); |
| METHOD(void, write_scan_header, (compress_info_ptr cinfo)); |
| METHOD(void, write_jpeg_data, (compress_info_ptr cinfo, |
| char *dataptr, |
| int datacount)); |
| METHOD(void, write_scan_trailer, (compress_info_ptr cinfo)); |
| METHOD(void, write_file_trailer, (compress_info_ptr cinfo)); |
| /* Pipeline control */ |
| METHOD(void, c_pipeline_controller, (compress_info_ptr cinfo)); |
| METHOD(void, entropy_output, (compress_info_ptr cinfo, |
| char *dataptr, |
| int datacount)); |
| /* Overall control */ |
| METHOD(void, c_per_scan_method_selection, (compress_info_ptr cinfo)); |
| }; |
| |
| /* Methods used during JPEG decompression. */ |
| |
| struct decompress_methods_struct { |
| /* Hook for user interface to get control after reading file header */ |
| METHOD(void, d_ui_method_selection, (decompress_info_ptr cinfo)); |
| /* Hook for user interface to do progress monitoring */ |
| METHOD(void, progress_monitor, (decompress_info_ptr cinfo, |
| long loopcounter, long looplimit)); |
| /* JPEG file scanning */ |
| METHOD(void, read_file_header, (decompress_info_ptr cinfo)); |
| METHOD(boolean, read_scan_header, (decompress_info_ptr cinfo)); |
| METHOD(int, read_jpeg_data, (decompress_info_ptr cinfo)); |
| METHOD(void, read_scan_trailer, (decompress_info_ptr cinfo)); |
| METHOD(void, read_file_trailer, (decompress_info_ptr cinfo)); |
| /* Entropy decoding */ |
| METHOD(void, entropy_decoder_init, (decompress_info_ptr cinfo)); |
| METHOD(void, entropy_decode, (decompress_info_ptr cinfo, |
| JBLOCK *MCU_data)); |
| METHOD(void, entropy_decoder_term, (decompress_info_ptr cinfo)); |
| /* MCU disassembly: fetch MCUs from entropy_decode, build coef array */ |
| /* The reverse_DCT step is in the same module for symmetry reasons */ |
| METHOD(void, disassemble_init, (decompress_info_ptr cinfo)); |
| METHOD(void, disassemble_MCU, (decompress_info_ptr cinfo, |
| JBLOCKIMAGE image_data)); |
| METHOD(void, reverse_DCT, (decompress_info_ptr cinfo, |
| JBLOCKIMAGE coeff_data, |
| JSAMPIMAGE output_data, int start_row)); |
| METHOD(void, disassemble_term, (decompress_info_ptr cinfo)); |
| /* Cross-block smoothing */ |
| METHOD(void, smooth_coefficients, (decompress_info_ptr cinfo, |
| jpeg_component_info *compptr, |
| JBLOCKROW above, |
| JBLOCKROW currow, |
| JBLOCKROW below, |
| JBLOCKROW output)); |
| /* Un-subsample pixel values of a single component */ |
| /* There can be a different unsubsample method for each component */ |
| METHOD(void, unsubsample_init, (decompress_info_ptr cinfo)); |
| unsubsample_ptr unsubsample[MAX_COMPS_IN_SCAN]; |
| METHOD(void, unsubsample_term, (decompress_info_ptr cinfo)); |
| /* Color space and gamma conversion */ |
| METHOD(void, colorout_init, (decompress_info_ptr cinfo)); |
| METHOD(void, color_convert, (decompress_info_ptr cinfo, |
| int num_rows, long num_cols, |
| JSAMPIMAGE input_data, |
| JSAMPIMAGE output_data)); |
| METHOD(void, colorout_term, (decompress_info_ptr cinfo)); |
| /* Color quantization */ |
| METHOD(void, color_quant_init, (decompress_info_ptr cinfo)); |
| METHOD(void, color_quantize, (decompress_info_ptr cinfo, |
| int num_rows, |
| JSAMPIMAGE input_data, |
| JSAMPARRAY output_data)); |
| METHOD(void, color_quant_prescan, (decompress_info_ptr cinfo, |
| int num_rows, |
| JSAMPIMAGE image_data, |
| JSAMPARRAY workspace)); |
| METHOD(void, color_quant_doit, (decompress_info_ptr cinfo, |
| quantize_caller_ptr source_method)); |
| METHOD(void, color_quant_term, (decompress_info_ptr cinfo)); |
| /* Output image writing */ |
| METHOD(void, output_init, (decompress_info_ptr cinfo)); |
| METHOD(void, put_color_map, (decompress_info_ptr cinfo, |
| int num_colors, JSAMPARRAY colormap)); |
| METHOD(void, put_pixel_rows, (decompress_info_ptr cinfo, |
| int num_rows, |
| JSAMPIMAGE pixel_data)); |
| METHOD(void, output_term, (decompress_info_ptr cinfo)); |
| /* Pipeline control */ |
| METHOD(void, d_pipeline_controller, (decompress_info_ptr cinfo)); |
| /* Overall control */ |
| METHOD(void, d_per_scan_method_selection, (decompress_info_ptr cinfo)); |
| }; |
| |
| |
| /* External declarations for routines that aren't called via method ptrs. */ |
| /* Note: use "j" as first char of names to minimize namespace pollution. */ |
| /* The PP macro hides prototype parameters from compilers that can't cope. */ |
| |
| #ifdef PROTO |
| #define PP(arglist) arglist |
| #else |
| #define PP(arglist) () |
| #endif |
| |
| |
| /* main entry for compression */ |
| EXTERN void jpeg_compress PP((compress_info_ptr cinfo)); |
| |
| /* default parameter setup for compression */ |
| EXTERN void j_c_defaults PP((compress_info_ptr cinfo, int quality, |
| boolean force_baseline)); |
| EXTERN void j_monochrome_default PP((compress_info_ptr cinfo)); |
| EXTERN void j_set_quality PP((compress_info_ptr cinfo, int quality, |
| boolean force_baseline)); |
| |
| /* main entry for decompression */ |
| EXTERN void jpeg_decompress PP((decompress_info_ptr cinfo)); |
| |
| /* default parameter setup for decompression */ |
| EXTERN void j_d_defaults PP((decompress_info_ptr cinfo, |
| boolean standard_buffering)); |
| |
| /* forward DCT */ |
| EXTERN void j_fwd_dct PP((DCTBLOCK data)); |
| /* inverse DCT */ |
| EXTERN void j_rev_dct PP((DCTBLOCK data)); |
| |
| /* utility routines in jutils.c */ |
| EXTERN long jround_up PP((long a, long b)); |
| EXTERN void jcopy_sample_rows PP((JSAMPARRAY input_array, int source_row, |
| JSAMPARRAY output_array, int dest_row, |
| int num_rows, long num_cols)); |
| EXTERN void jcopy_block_row PP((JBLOCKROW input_row, JBLOCKROW output_row, |
| long num_blocks)); |
| EXTERN void jzero_far PP((void FAR * target, size_t bytestozero)); |
| |
| /* method selection routines for compression modules */ |
| EXTERN void jselcpipeline PP((compress_info_ptr cinfo)); /* jcpipe.c */ |
| EXTERN void jselchuffman PP((compress_info_ptr cinfo)); /* jchuff.c */ |
| EXTERN void jselcarithmetic PP((compress_info_ptr cinfo)); /* jcarith.c */ |
| EXTERN void jselexpand PP((compress_info_ptr cinfo)); /* jcexpand.c */ |
| EXTERN void jselsubsample PP((compress_info_ptr cinfo)); /* jcsample.c */ |
| EXTERN void jselcmcu PP((compress_info_ptr cinfo)); /* jcmcu.c */ |
| EXTERN void jselccolor PP((compress_info_ptr cinfo)); /* jccolor.c */ |
| /* The user interface should call one of these to select input format: */ |
| EXTERN void jselrgif PP((compress_info_ptr cinfo)); /* jrdgif.c */ |
| EXTERN void jselrppm PP((compress_info_ptr cinfo)); /* jrdppm.c */ |
| EXTERN void jselrrle PP((compress_info_ptr cinfo)); /* jrdrle.c */ |
| EXTERN void jselrtarga PP((compress_info_ptr cinfo)); /* jrdtarga.c */ |
| /* and one of these to select output header format: */ |
| EXTERN void jselwjfif PP((compress_info_ptr cinfo)); /* jwrjfif.c */ |
| |
| /* method selection routines for decompression modules */ |
| EXTERN void jseldpipeline PP((decompress_info_ptr cinfo)); /* jdpipe.c */ |
| EXTERN void jseldhuffman PP((decompress_info_ptr cinfo)); /* jdhuff.c */ |
| EXTERN void jseldarithmetic PP((decompress_info_ptr cinfo)); /* jdarith.c */ |
| EXTERN void jseldmcu PP((decompress_info_ptr cinfo)); /* jdmcu.c */ |
| EXTERN void jselbsmooth PP((decompress_info_ptr cinfo)); /* jbsmooth.c */ |
| EXTERN void jselunsubsample PP((decompress_info_ptr cinfo)); /* jdsample.c */ |
| EXTERN void jseldcolor PP((decompress_info_ptr cinfo)); /* jdcolor.c */ |
| EXTERN void jsel1quantize PP((decompress_info_ptr cinfo)); /* jquant1.c */ |
| EXTERN void jsel2quantize PP((decompress_info_ptr cinfo)); /* jquant2.c */ |
| /* The user interface should call one of these to select input format: */ |
| EXTERN void jselrjfif PP((decompress_info_ptr cinfo)); /* jrdjfif.c */ |
| /* and one of these to select output image format: */ |
| EXTERN void jselwgif PP((decompress_info_ptr cinfo)); /* jwrgif.c */ |
| EXTERN void jselwppm PP((decompress_info_ptr cinfo)); /* jwrppm.c */ |
| EXTERN void jselwrle PP((decompress_info_ptr cinfo)); /* jwrrle.c */ |
| EXTERN void jselwtarga PP((decompress_info_ptr cinfo)); /* jwrtarga.c */ |
| |
| /* method selection routines for system-dependent modules */ |
| EXTERN void jselerror PP((external_methods_ptr emethods)); /* jerror.c */ |
| EXTERN void jselmemmgr PP((external_methods_ptr emethods)); /* jmemmgr.c */ |
| |
| |
| /* We assume that right shift corresponds to signed division by 2 with |
| * rounding towards minus infinity. This is correct for typical "arithmetic |
| * shift" instructions that shift in copies of the sign bit. But some |
| * C compilers implement >> with an unsigned shift. For these machines you |
| * must define RIGHT_SHIFT_IS_UNSIGNED. |
| * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity. |
| * It is only applied with constant shift counts. SHIFT_TEMPS must be |
| * included in the variables of any routine using RIGHT_SHIFT. |
| */ |
| |
| #ifdef RIGHT_SHIFT_IS_UNSIGNED |
| #define SHIFT_TEMPS INT32 shift_temp; |
| #define RIGHT_SHIFT(x,shft) \ |
| ((shift_temp = (x)) < 0 ? \ |
| (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \ |
| (shift_temp >> (shft))) |
| #else |
| #define SHIFT_TEMPS |
| #define RIGHT_SHIFT(x,shft) ((x) >> (shft)) |
| #endif |
| |
| |
| /* Miscellaneous useful macros */ |
| |
| #undef MAX |
| #define MAX(a,b) ((a) > (b) ? (a) : (b)) |
| #undef MIN |
| #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
| |
| |
| #define RST0 0xD0 /* RST0 marker code */ |
