| /* |
| * jdcolor.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1997, Thomas G. Lane. |
| * Modified 2011 by Guido Vollbeding. |
| * libjpeg-turbo Modifications: |
| * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
| * Copyright (C) 2009, 2011-2012, 2014-2015, D. R. Commander. |
| * Copyright (C) 2013, Linaro Limited. |
| * For conditions of distribution and use, see the accompanying README file. |
| * |
| * This file contains output colorspace conversion routines. |
| */ |
| |
| #define JPEG_INTERNALS |
| #include "jinclude.h" |
| #include "jpeglib.h" |
| #include "jsimd.h" |
| #include "jconfigint.h" |
| |
| |
| /* Private subobject */ |
| |
| typedef struct { |
| struct jpeg_color_deconverter pub; /* public fields */ |
| |
| /* Private state for YCC->RGB conversion */ |
| int * Cr_r_tab; /* => table for Cr to R conversion */ |
| int * Cb_b_tab; /* => table for Cb to B conversion */ |
| INT32 * Cr_g_tab; /* => table for Cr to G conversion */ |
| INT32 * Cb_g_tab; /* => table for Cb to G conversion */ |
| |
| /* Private state for RGB->Y conversion */ |
| INT32 * rgb_y_tab; /* => table for RGB to Y conversion */ |
| } my_color_deconverter; |
| |
| typedef my_color_deconverter * my_cconvert_ptr; |
| |
| |
| /**************** YCbCr -> RGB conversion: most common case **************/ |
| /**************** RGB -> Y conversion: less common case **************/ |
| |
| /* |
| * YCbCr is defined per CCIR 601-1, except that Cb and Cr are |
| * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. |
| * The conversion equations to be implemented are therefore |
| * |
| * R = Y + 1.40200 * Cr |
| * G = Y - 0.34414 * Cb - 0.71414 * Cr |
| * B = Y + 1.77200 * Cb |
| * |
| * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B |
| * |
| * where Cb and Cr represent the incoming values less CENTERJSAMPLE. |
| * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.) |
| * |
| * To avoid floating-point arithmetic, we represent the fractional constants |
| * as integers scaled up by 2^16 (about 4 digits precision); we have to divide |
| * the products by 2^16, with appropriate rounding, to get the correct answer. |
| * Notice that Y, being an integral input, does not contribute any fraction |
| * so it need not participate in the rounding. |
| * |
| * For even more speed, we avoid doing any multiplications in the inner loop |
| * by precalculating the constants times Cb and Cr for all possible values. |
| * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table); |
| * for 12-bit samples it is still acceptable. It's not very reasonable for |
| * 16-bit samples, but if you want lossless storage you shouldn't be changing |
| * colorspace anyway. |
| * The Cr=>R and Cb=>B values can be rounded to integers in advance; the |
| * values for the G calculation are left scaled up, since we must add them |
| * together before rounding. |
| */ |
| |
| #define SCALEBITS 16 /* speediest right-shift on some machines */ |
| #define ONE_HALF ((INT32) 1 << (SCALEBITS-1)) |
| #define FIX(x) ((INT32) ((x) * (1L<<SCALEBITS) + 0.5)) |
| |
| /* We allocate one big table for RGB->Y conversion and divide it up into |
| * three parts, instead of doing three alloc_small requests. This lets us |
| * use a single table base address, which can be held in a register in the |
| * inner loops on many machines (more than can hold all three addresses, |
| * anyway). |
| */ |
| |
| #define R_Y_OFF 0 /* offset to R => Y section */ |
| #define G_Y_OFF (1*(MAXJSAMPLE+1)) /* offset to G => Y section */ |
| #define B_Y_OFF (2*(MAXJSAMPLE+1)) /* etc. */ |
| #define TABLE_SIZE (3*(MAXJSAMPLE+1)) |
| |
| |
| /* Include inline routines for colorspace extensions */ |
| |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_PIXELSIZE |
| |
| #define RGB_RED EXT_RGB_RED |
| #define RGB_GREEN EXT_RGB_GREEN |
| #define RGB_BLUE EXT_RGB_BLUE |
| #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extrgb_convert_internal |
| #define gray_rgb_convert_internal gray_extrgb_convert_internal |
| #define rgb_rgb_convert_internal rgb_extrgb_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| #define RGB_RED EXT_RGBX_RED |
| #define RGB_GREEN EXT_RGBX_GREEN |
| #define RGB_BLUE EXT_RGBX_BLUE |
| #define RGB_ALPHA 3 |
| #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extrgbx_convert_internal |
| #define gray_rgb_convert_internal gray_extrgbx_convert_internal |
| #define rgb_rgb_convert_internal rgb_extrgbx_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_ALPHA |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| #define RGB_RED EXT_BGR_RED |
| #define RGB_GREEN EXT_BGR_GREEN |
| #define RGB_BLUE EXT_BGR_BLUE |
| #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extbgr_convert_internal |
| #define gray_rgb_convert_internal gray_extbgr_convert_internal |
| #define rgb_rgb_convert_internal rgb_extbgr_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| #define RGB_RED EXT_BGRX_RED |
| #define RGB_GREEN EXT_BGRX_GREEN |
| #define RGB_BLUE EXT_BGRX_BLUE |
| #define RGB_ALPHA 3 |
| #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extbgrx_convert_internal |
| #define gray_rgb_convert_internal gray_extbgrx_convert_internal |
| #define rgb_rgb_convert_internal rgb_extbgrx_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_ALPHA |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| #define RGB_RED EXT_XBGR_RED |
| #define RGB_GREEN EXT_XBGR_GREEN |
| #define RGB_BLUE EXT_XBGR_BLUE |
| #define RGB_ALPHA 0 |
| #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extxbgr_convert_internal |
| #define gray_rgb_convert_internal gray_extxbgr_convert_internal |
| #define rgb_rgb_convert_internal rgb_extxbgr_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_ALPHA |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| #define RGB_RED EXT_XRGB_RED |
| #define RGB_GREEN EXT_XRGB_GREEN |
| #define RGB_BLUE EXT_XRGB_BLUE |
| #define RGB_ALPHA 0 |
| #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE |
| #define ycc_rgb_convert_internal ycc_extxrgb_convert_internal |
| #define gray_rgb_convert_internal gray_extxrgb_convert_internal |
| #define rgb_rgb_convert_internal rgb_extxrgb_convert_internal |
| #include "jdcolext.c" |
| #undef RGB_RED |
| #undef RGB_GREEN |
| #undef RGB_BLUE |
| #undef RGB_ALPHA |
| #undef RGB_PIXELSIZE |
| #undef ycc_rgb_convert_internal |
| #undef gray_rgb_convert_internal |
| #undef rgb_rgb_convert_internal |
| |
| |
| /* |
| * Initialize tables for YCC->RGB colorspace conversion. |
| */ |
| |
| LOCAL(void) |
| build_ycc_rgb_table (j_decompress_ptr cinfo) |
| { |
| my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| int i; |
| INT32 x; |
| SHIFT_TEMPS |
| |
| cconvert->Cr_r_tab = (int *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| (MAXJSAMPLE+1) * sizeof(int)); |
| cconvert->Cb_b_tab = (int *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| (MAXJSAMPLE+1) * sizeof(int)); |
| cconvert->Cr_g_tab = (INT32 *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| (MAXJSAMPLE+1) * sizeof(INT32)); |
| cconvert->Cb_g_tab = (INT32 *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| (MAXJSAMPLE+1) * sizeof(INT32)); |
| |
| for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
| /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
| /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
| /* Cr=>R value is nearest int to 1.40200 * x */ |
| cconvert->Cr_r_tab[i] = (int) |
| RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS); |
| /* Cb=>B value is nearest int to 1.77200 * x */ |
| cconvert->Cb_b_tab[i] = (int) |
| RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS); |
| /* Cr=>G value is scaled-up -0.71414 * x */ |
| cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x; |
| /* Cb=>G value is scaled-up -0.34414 * x */ |
| /* We also add in ONE_HALF so that need not do it in inner loop */ |
| cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF; |
| } |
| } |
| |
| |
| /* |
| * Convert some rows of samples to the output colorspace. |
| */ |
| |
| METHODDEF(void) |
| ycc_rgb_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| switch (cinfo->out_color_space) { |
| case JCS_EXT_RGB: |
| ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_RGBX: |
| case JCS_EXT_RGBA: |
| ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGR: |
| ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGRX: |
| case JCS_EXT_BGRA: |
| ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XBGR: |
| case JCS_EXT_ABGR: |
| ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XRGB: |
| case JCS_EXT_ARGB: |
| ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| default: |
| ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| } |
| } |
| |
| |
| /**************** Cases other than YCbCr -> RGB **************/ |
| |
| |
| /* |
| * Initialize for RGB->grayscale colorspace conversion. |
| */ |
| |
| LOCAL(void) |
| build_rgb_y_table (j_decompress_ptr cinfo) |
| { |
| my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| INT32 * rgb_y_tab; |
| INT32 i; |
| |
| /* Allocate and fill in the conversion tables. */ |
| cconvert->rgb_y_tab = rgb_y_tab = (INT32 *) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| (TABLE_SIZE * sizeof(INT32))); |
| |
| for (i = 0; i <= MAXJSAMPLE; i++) { |
| rgb_y_tab[i+R_Y_OFF] = FIX(0.29900) * i; |
| rgb_y_tab[i+G_Y_OFF] = FIX(0.58700) * i; |
| rgb_y_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF; |
| } |
| } |
| |
| |
| /* |
| * Convert RGB to grayscale. |
| */ |
| |
| METHODDEF(void) |
| rgb_gray_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| register int r, g, b; |
| register INT32 * ctab = cconvert->rgb_y_tab; |
| register JSAMPROW outptr; |
| register JSAMPROW inptr0, inptr1, inptr2; |
| register JDIMENSION col; |
| JDIMENSION num_cols = cinfo->output_width; |
| |
| while (--num_rows >= 0) { |
| inptr0 = input_buf[0][input_row]; |
| inptr1 = input_buf[1][input_row]; |
| inptr2 = input_buf[2][input_row]; |
| input_row++; |
| outptr = *output_buf++; |
| for (col = 0; col < num_cols; col++) { |
| r = GETJSAMPLE(inptr0[col]); |
| g = GETJSAMPLE(inptr1[col]); |
| b = GETJSAMPLE(inptr2[col]); |
| /* Y */ |
| outptr[col] = (JSAMPLE) |
| ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF]) |
| >> SCALEBITS); |
| } |
| } |
| } |
| |
| |
| /* |
| * Color conversion for no colorspace change: just copy the data, |
| * converting from separate-planes to interleaved representation. |
| */ |
| |
| METHODDEF(void) |
| null_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| register JSAMPROW inptr, inptr0, inptr1, inptr2, inptr3, outptr; |
| register JDIMENSION col; |
| register int num_components = cinfo->num_components; |
| JDIMENSION num_cols = cinfo->output_width; |
| int ci; |
| |
| if (num_components == 3) { |
| while (--num_rows >= 0) { |
| inptr0 = input_buf[0][input_row]; |
| inptr1 = input_buf[1][input_row]; |
| inptr2 = input_buf[2][input_row]; |
| input_row++; |
| outptr = *output_buf++; |
| for (col = 0; col < num_cols; col++) { |
| *outptr++ = inptr0[col]; |
| *outptr++ = inptr1[col]; |
| *outptr++ = inptr2[col]; |
| } |
| } |
| } else if (num_components == 4) { |
| while (--num_rows >= 0) { |
| inptr0 = input_buf[0][input_row]; |
| inptr1 = input_buf[1][input_row]; |
| inptr2 = input_buf[2][input_row]; |
| inptr3 = input_buf[3][input_row]; |
| input_row++; |
| outptr = *output_buf++; |
| for (col = 0; col < num_cols; col++) { |
| *outptr++ = inptr0[col]; |
| *outptr++ = inptr1[col]; |
| *outptr++ = inptr2[col]; |
| *outptr++ = inptr3[col]; |
| } |
| } |
| } else { |
| while (--num_rows >= 0) { |
| for (ci = 0; ci < num_components; ci++) { |
| inptr = input_buf[ci][input_row]; |
| outptr = *output_buf; |
| for (col = 0; col < num_cols; col++) { |
| outptr[ci] = inptr[col]; |
| outptr += num_components; |
| } |
| } |
| output_buf++; |
| input_row++; |
| } |
| } |
| } |
| |
| |
| /* |
| * Color conversion for grayscale: just copy the data. |
| * This also works for YCbCr -> grayscale conversion, in which |
| * we just copy the Y (luminance) component and ignore chrominance. |
| */ |
| |
| METHODDEF(void) |
| grayscale_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0, |
| num_rows, cinfo->output_width); |
| } |
| |
| |
| /* |
| * Convert grayscale to RGB |
| */ |
| |
| METHODDEF(void) |
| gray_rgb_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| switch (cinfo->out_color_space) { |
| case JCS_EXT_RGB: |
| gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_RGBX: |
| case JCS_EXT_RGBA: |
| gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGR: |
| gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGRX: |
| case JCS_EXT_BGRA: |
| gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XBGR: |
| case JCS_EXT_ABGR: |
| gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XRGB: |
| case JCS_EXT_ARGB: |
| gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| default: |
| gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| } |
| } |
| |
| |
| /* |
| * Convert plain RGB to extended RGB |
| */ |
| |
| METHODDEF(void) |
| rgb_rgb_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| switch (cinfo->out_color_space) { |
| case JCS_EXT_RGB: |
| rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_RGBX: |
| case JCS_EXT_RGBA: |
| rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGR: |
| rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_BGRX: |
| case JCS_EXT_BGRA: |
| rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XBGR: |
| case JCS_EXT_ABGR: |
| rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| case JCS_EXT_XRGB: |
| case JCS_EXT_ARGB: |
| rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| default: |
| rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf, |
| num_rows); |
| break; |
| } |
| } |
| |
| |
| /* |
| * Adobe-style YCCK->CMYK conversion. |
| * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same |
| * conversion as above, while passing K (black) unchanged. |
| * We assume build_ycc_rgb_table has been called. |
| */ |
| |
| METHODDEF(void) |
| ycck_cmyk_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
| register int y, cb, cr; |
| register JSAMPROW outptr; |
| register JSAMPROW inptr0, inptr1, inptr2, inptr3; |
| register JDIMENSION col; |
| JDIMENSION num_cols = cinfo->output_width; |
| /* copy these pointers into registers if possible */ |
| register JSAMPLE * range_limit = cinfo->sample_range_limit; |
| register int * Crrtab = cconvert->Cr_r_tab; |
| register int * Cbbtab = cconvert->Cb_b_tab; |
| register INT32 * Crgtab = cconvert->Cr_g_tab; |
| register INT32 * Cbgtab = cconvert->Cb_g_tab; |
| SHIFT_TEMPS |
| |
| while (--num_rows >= 0) { |
| inptr0 = input_buf[0][input_row]; |
| inptr1 = input_buf[1][input_row]; |
| inptr2 = input_buf[2][input_row]; |
| inptr3 = input_buf[3][input_row]; |
| input_row++; |
| outptr = *output_buf++; |
| for (col = 0; col < num_cols; col++) { |
| y = GETJSAMPLE(inptr0[col]); |
| cb = GETJSAMPLE(inptr1[col]); |
| cr = GETJSAMPLE(inptr2[col]); |
| /* Range-limiting is essential due to noise introduced by DCT losses. */ |
| outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])]; /* red */ |
| outptr[1] = range_limit[MAXJSAMPLE - (y + /* green */ |
| ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr], |
| SCALEBITS)))]; |
| outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])]; /* blue */ |
| /* K passes through unchanged */ |
| outptr[3] = inptr3[col]; /* don't need GETJSAMPLE here */ |
| outptr += 4; |
| } |
| } |
| } |
| |
| |
| /* |
| * RGB565 conversion |
| */ |
| |
| #define PACK_SHORT_565_LE(r, g, b) ((((r) << 8) & 0xF800) | \ |
| (((g) << 3) & 0x7E0) | ((b) >> 3)) |
| #define PACK_SHORT_565_BE(r, g, b) (((r) & 0xF8) | ((g) >> 5) | \ |
| (((g) << 11) & 0xE000) | \ |
| (((b) << 5) & 0x1F00)) |
| |
| #define PACK_TWO_PIXELS_LE(l, r) ((r << 16) | l) |
| #define PACK_TWO_PIXELS_BE(l, r) ((l << 16) | r) |
| |
| #define PACK_NEED_ALIGNMENT(ptr) (((size_t)(ptr)) & 3) |
| |
| #define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(int *)(addr)) = pixels) |
| |
| #define DITHER_565_R(r, dither) ((r) + ((dither) & 0xFF)) |
| #define DITHER_565_G(g, dither) ((g) + (((dither) & 0xFF) >> 1)) |
| #define DITHER_565_B(b, dither) ((b) + ((dither) & 0xFF)) |
| |
| |
| /* Declarations for ordered dithering |
| * |
| * We use a 4x4 ordered dither array packed into 32 bits. This array is |
| * sufficent for dithering RGB888 to RGB565. |
| */ |
| |
| #define DITHER_MASK 0x3 |
| #define DITHER_ROTATE(x) (((x) << 24) | (((x) >> 8) & 0x00FFFFFF)) |
| static const INT32 dither_matrix[4] = { |
| 0x0008020A, |
| 0x0C040E06, |
| 0x030B0109, |
| 0x0F070D05 |
| }; |
| |
| |
| static INLINE boolean is_big_endian(void) |
| { |
| int test_value = 1; |
| if(*(char *)&test_value != 1) |
| return TRUE; |
| return FALSE; |
| } |
| |
| |
| /* Include inline routines for RGB565 conversion */ |
| |
| #define PACK_SHORT_565 PACK_SHORT_565_LE |
| #define PACK_TWO_PIXELS PACK_TWO_PIXELS_LE |
| #define ycc_rgb565_convert_internal ycc_rgb565_convert_le |
| #define ycc_rgb565D_convert_internal ycc_rgb565D_convert_le |
| #define rgb_rgb565_convert_internal rgb_rgb565_convert_le |
| #define rgb_rgb565D_convert_internal rgb_rgb565D_convert_le |
| #define gray_rgb565_convert_internal gray_rgb565_convert_le |
| #define gray_rgb565D_convert_internal gray_rgb565D_convert_le |
| #include "jdcol565.c" |
| #undef PACK_SHORT_565 |
| #undef PACK_TWO_PIXELS |
| #undef ycc_rgb565_convert_internal |
| #undef ycc_rgb565D_convert_internal |
| #undef rgb_rgb565_convert_internal |
| #undef rgb_rgb565D_convert_internal |
| #undef gray_rgb565_convert_internal |
| #undef gray_rgb565D_convert_internal |
| |
| #define PACK_SHORT_565 PACK_SHORT_565_BE |
| #define PACK_TWO_PIXELS PACK_TWO_PIXELS_BE |
| #define ycc_rgb565_convert_internal ycc_rgb565_convert_be |
| #define ycc_rgb565D_convert_internal ycc_rgb565D_convert_be |
| #define rgb_rgb565_convert_internal rgb_rgb565_convert_be |
| #define rgb_rgb565D_convert_internal rgb_rgb565D_convert_be |
| #define gray_rgb565_convert_internal gray_rgb565_convert_be |
| #define gray_rgb565D_convert_internal gray_rgb565D_convert_be |
| #include "jdcol565.c" |
| #undef PACK_SHORT_565 |
| #undef PACK_TWO_PIXELS |
| #undef ycc_rgb565_convert_internal |
| #undef ycc_rgb565D_convert_internal |
| #undef rgb_rgb565_convert_internal |
| #undef rgb_rgb565D_convert_internal |
| #undef gray_rgb565_convert_internal |
| #undef gray_rgb565D_convert_internal |
| |
| |
| METHODDEF(void) |
| ycc_rgb565_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| ycc_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| ycc_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| METHODDEF(void) |
| ycc_rgb565D_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| ycc_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| ycc_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| METHODDEF(void) |
| rgb_rgb565_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| rgb_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| rgb_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| METHODDEF(void) |
| rgb_rgb565D_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| rgb_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| rgb_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| METHODDEF(void) |
| gray_rgb565_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| gray_rgb565_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| gray_rgb565_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| METHODDEF(void) |
| gray_rgb565D_convert (j_decompress_ptr cinfo, |
| JSAMPIMAGE input_buf, JDIMENSION input_row, |
| JSAMPARRAY output_buf, int num_rows) |
| { |
| if (is_big_endian()) |
| gray_rgb565D_convert_be(cinfo, input_buf, input_row, output_buf, num_rows); |
| else |
| gray_rgb565D_convert_le(cinfo, input_buf, input_row, output_buf, num_rows); |
| } |
| |
| |
| /* |
| * Empty method for start_pass. |
| */ |
| |
| METHODDEF(void) |
| start_pass_dcolor (j_decompress_ptr cinfo) |
| { |
| /* no work needed */ |
| } |
| |
| |
| /* |
| * Module initialization routine for output colorspace conversion. |
| */ |
| |
| GLOBAL(void) |
| jinit_color_deconverter (j_decompress_ptr cinfo) |
| { |
| my_cconvert_ptr cconvert; |
| int ci; |
| |
| cconvert = (my_cconvert_ptr) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| sizeof(my_color_deconverter)); |
| cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert; |
| cconvert->pub.start_pass = start_pass_dcolor; |
| |
| /* Make sure num_components agrees with jpeg_color_space */ |
| switch (cinfo->jpeg_color_space) { |
| case JCS_GRAYSCALE: |
| if (cinfo->num_components != 1) |
| ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| break; |
| |
| case JCS_RGB: |
| case JCS_YCbCr: |
| if (cinfo->num_components != 3) |
| ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| break; |
| |
| case JCS_CMYK: |
| case JCS_YCCK: |
| if (cinfo->num_components != 4) |
| ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| break; |
| |
| default: /* JCS_UNKNOWN can be anything */ |
| if (cinfo->num_components < 1) |
| ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| break; |
| } |
| |
| /* Set out_color_components and conversion method based on requested space. |
| * Also clear the component_needed flags for any unused components, |
| * so that earlier pipeline stages can avoid useless computation. |
| */ |
| |
| switch (cinfo->out_color_space) { |
| case JCS_GRAYSCALE: |
| cinfo->out_color_components = 1; |
| if (cinfo->jpeg_color_space == JCS_GRAYSCALE || |
| cinfo->jpeg_color_space == JCS_YCbCr) { |
| cconvert->pub.color_convert = grayscale_convert; |
| /* For color->grayscale conversion, only the Y (0) component is needed */ |
| for (ci = 1; ci < cinfo->num_components; ci++) |
| cinfo->comp_info[ci].component_needed = FALSE; |
| } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| cconvert->pub.color_convert = rgb_gray_convert; |
| build_rgb_y_table(cinfo); |
| } else |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| break; |
| |
| case JCS_RGB: |
| case JCS_EXT_RGB: |
| case JCS_EXT_RGBX: |
| case JCS_EXT_BGR: |
| case JCS_EXT_BGRX: |
| case JCS_EXT_XBGR: |
| case JCS_EXT_XRGB: |
| case JCS_EXT_RGBA: |
| case JCS_EXT_BGRA: |
| case JCS_EXT_ABGR: |
| case JCS_EXT_ARGB: |
| cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space]; |
| if (cinfo->jpeg_color_space == JCS_YCbCr) { |
| if (jsimd_can_ycc_rgb()) |
| cconvert->pub.color_convert = jsimd_ycc_rgb_convert; |
| else { |
| cconvert->pub.color_convert = ycc_rgb_convert; |
| build_ycc_rgb_table(cinfo); |
| } |
| } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| cconvert->pub.color_convert = gray_rgb_convert; |
| } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| if (rgb_red[cinfo->out_color_space] == 0 && |
| rgb_green[cinfo->out_color_space] == 1 && |
| rgb_blue[cinfo->out_color_space] == 2 && |
| rgb_pixelsize[cinfo->out_color_space] == 3) |
| cconvert->pub.color_convert = null_convert; |
| else |
| cconvert->pub.color_convert = rgb_rgb_convert; |
| } else |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| break; |
| |
| case JCS_RGB565: |
| cinfo->out_color_components = 3; |
| if (cinfo->dither_mode == JDITHER_NONE) { |
| if (cinfo->jpeg_color_space == JCS_YCbCr) { |
| if (jsimd_can_ycc_rgb565()) |
| cconvert->pub.color_convert = jsimd_ycc_rgb565_convert; |
| else { |
| cconvert->pub.color_convert = ycc_rgb565_convert; |
| build_ycc_rgb_table(cinfo); |
| } |
| } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| cconvert->pub.color_convert = gray_rgb565_convert; |
| } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| cconvert->pub.color_convert = rgb_rgb565_convert; |
| } else |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| } else { |
| /* only ordered dithering is supported */ |
| if (cinfo->jpeg_color_space == JCS_YCbCr) { |
| cconvert->pub.color_convert = ycc_rgb565D_convert; |
| build_ycc_rgb_table(cinfo); |
| } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) { |
| cconvert->pub.color_convert = gray_rgb565D_convert; |
| } else if (cinfo->jpeg_color_space == JCS_RGB) { |
| cconvert->pub.color_convert = rgb_rgb565D_convert; |
| } else |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| } |
| break; |
| |
| case JCS_CMYK: |
| cinfo->out_color_components = 4; |
| if (cinfo->jpeg_color_space == JCS_YCCK) { |
| cconvert->pub.color_convert = ycck_cmyk_convert; |
| build_ycc_rgb_table(cinfo); |
| } else if (cinfo->jpeg_color_space == JCS_CMYK) { |
| cconvert->pub.color_convert = null_convert; |
| } else |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| break; |
| |
| default: |
| /* Permit null conversion to same output space */ |
| if (cinfo->out_color_space == cinfo->jpeg_color_space) { |
| cinfo->out_color_components = cinfo->num_components; |
| cconvert->pub.color_convert = null_convert; |
| } else /* unsupported non-null conversion */ |
| ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
| break; |
| } |
| |
| if (cinfo->quantize_colors) |
| cinfo->output_components = 1; /* single colormapped output component */ |
| else |
| cinfo->output_components = cinfo->out_color_components; |
| } |
