/* * 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 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.ijg * 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 */ JLONG *Cr_g_tab; /* => table for Cr to G conversion */ JLONG *Cb_g_tab; /* => table for Cb to G conversion */ /* Private state for RGB->Y conversion */ JLONG *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 ((JLONG) 1 << (SCALEBITS-1)) #define FIX(x) ((JLONG) ((x) * (1L<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; JLONG 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 = (JLONG *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * sizeof(JLONG)); cconvert->Cb_g_tab = (JLONG *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * sizeof(JLONG)); 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; JLONG *rgb_y_tab; JLONG i; /* Allocate and fill in the conversion tables. */ cconvert->rgb_y_tab = rgb_y_tab = (JLONG *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (TABLE_SIZE * sizeof(JLONG))); 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 JLONG *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 JLONG *Crgtab = cconvert->Cr_g_tab; register JLONG *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) & 0xFF) << 24) | (((x) >> 8) & 0x00FFFFFF)) static const JLONG 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; }