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@ -2,7 +2,7 @@ |
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* jdcolor.c |
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* jdcolor.c |
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* |
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* |
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* Copyright (C) 1991-1997, Thomas G. Lane. |
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* Copyright (C) 1991-1997, Thomas G. Lane. |
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* Modified 2011-2017 by Guido Vollbeding. |
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* Modified 2011-2019 by Guido Vollbeding. |
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* This file is part of the Independent JPEG Group's software. |
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* This file is part of the Independent JPEG Group's software. |
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* For conditions of distribution and use, see the accompanying README file. |
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* For conditions of distribution and use, see the accompanying README file. |
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* |
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* |
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@ -124,28 +124,22 @@ build_ycc_rgb_table (j_decompress_ptr cinfo) |
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INT32 x; |
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INT32 x; |
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SHIFT_TEMPS |
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SHIFT_TEMPS |
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cconvert->Cr_r_tab = (int *) |
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cconvert->Cr_r_tab = (int *) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(int)); |
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(MAXJSAMPLE+1) * SIZEOF(int)); |
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cconvert->Cb_b_tab = (int *) (*cinfo->mem->alloc_small) |
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cconvert->Cb_b_tab = (int *) |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(int)); |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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cconvert->Cr_g_tab = (INT32 *) (*cinfo->mem->alloc_small) |
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(MAXJSAMPLE+1) * SIZEOF(int)); |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); |
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cconvert->Cr_g_tab = (INT32 *) |
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cconvert->Cb_g_tab = (INT32 *) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); |
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(MAXJSAMPLE+1) * SIZEOF(INT32)); |
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cconvert->Cb_g_tab = (INT32 *) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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(MAXJSAMPLE+1) * SIZEOF(INT32)); |
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for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
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for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
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/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
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/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
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/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
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/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
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/* Cr=>R value is nearest int to 1.402 * x */ |
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/* Cr=>R value is nearest int to 1.402 * x */ |
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cconvert->Cr_r_tab[i] = (int) |
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cconvert->Cr_r_tab[i] = (int) DESCALE(FIX(1.402) * x, SCALEBITS); |
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RIGHT_SHIFT(FIX(1.402) * x + ONE_HALF, SCALEBITS); |
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/* Cb=>B value is nearest int to 1.772 * x */ |
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/* Cb=>B value is nearest int to 1.772 * x */ |
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cconvert->Cb_b_tab[i] = (int) |
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cconvert->Cb_b_tab[i] = (int) DESCALE(FIX(1.772) * x, SCALEBITS); |
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RIGHT_SHIFT(FIX(1.772) * x + ONE_HALF, SCALEBITS); |
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/* Cr=>G value is scaled-up -0.714136286 * x */ |
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/* Cr=>G value is scaled-up -0.714136286 * x */ |
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cconvert->Cr_g_tab[i] = (- FIX(0.714136286)) * x; |
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cconvert->Cr_g_tab[i] = (- FIX(0.714136286)) * x; |
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/* Cb=>G value is scaled-up -0.344136286 * x */ |
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/* Cb=>G value is scaled-up -0.344136286 * x */ |
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@ -164,28 +158,22 @@ build_bg_ycc_rgb_table (j_decompress_ptr cinfo) |
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INT32 x; |
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INT32 x; |
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SHIFT_TEMPS |
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SHIFT_TEMPS |
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cconvert->Cr_r_tab = (int *) |
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cconvert->Cr_r_tab = (int *) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(int)); |
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(MAXJSAMPLE+1) * SIZEOF(int)); |
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cconvert->Cb_b_tab = (int *) (*cinfo->mem->alloc_small) |
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cconvert->Cb_b_tab = (int *) |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(int)); |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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cconvert->Cr_g_tab = (INT32 *) (*cinfo->mem->alloc_small) |
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(MAXJSAMPLE+1) * SIZEOF(int)); |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); |
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cconvert->Cr_g_tab = (INT32 *) |
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cconvert->Cb_g_tab = (INT32 *) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); |
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(MAXJSAMPLE+1) * SIZEOF(INT32)); |
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cconvert->Cb_g_tab = (INT32 *) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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(MAXJSAMPLE+1) * SIZEOF(INT32)); |
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for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
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for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) { |
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/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
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/* i is the actual input pixel value, in the range 0..MAXJSAMPLE */ |
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/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
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/* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */ |
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/* Cr=>R value is nearest int to 2.804 * x */ |
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/* Cr=>R value is nearest int to 2.804 * x */ |
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cconvert->Cr_r_tab[i] = (int) |
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cconvert->Cr_r_tab[i] = (int) DESCALE(FIX(2.804) * x, SCALEBITS); |
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RIGHT_SHIFT(FIX(2.804) * x + ONE_HALF, SCALEBITS); |
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/* Cb=>B value is nearest int to 3.544 * x */ |
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/* Cb=>B value is nearest int to 3.544 * x */ |
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cconvert->Cb_b_tab[i] = (int) |
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cconvert->Cb_b_tab[i] = (int) DESCALE(FIX(3.544) * x, SCALEBITS); |
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RIGHT_SHIFT(FIX(3.544) * x + ONE_HALF, SCALEBITS); |
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/* Cr=>G value is scaled-up -1.428272572 * x */ |
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/* Cr=>G value is scaled-up -1.428272572 * x */ |
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cconvert->Cr_g_tab[i] = (- FIX(1.428272572)) * x; |
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cconvert->Cr_g_tab[i] = (- FIX(1.428272572)) * x; |
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/* Cb=>G value is scaled-up -0.688272572 * x */ |
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/* Cb=>G value is scaled-up -0.688272572 * x */ |
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@ -201,6 +189,7 @@ build_bg_ycc_rgb_table (j_decompress_ptr cinfo) |
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* Note that we change from noninterleaved, one-plane-per-component format |
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* Note that we change from noninterleaved, one-plane-per-component format |
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* to interleaved-pixel format. The output buffer is therefore three times |
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* to interleaved-pixel format. The output buffer is therefore three times |
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* as wide as the input buffer. |
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* as wide as the input buffer. |
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* |
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* A starting row offset is provided only for the input buffer. The caller |
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* A starting row offset is provided only for the input buffer. The caller |
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* can easily adjust the passed output_buf value to accommodate any row |
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* can easily adjust the passed output_buf value to accommodate any row |
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* offset required on that side. |
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* offset required on that side. |
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@ -264,9 +253,8 @@ build_rgb_y_table (j_decompress_ptr cinfo) |
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INT32 i; |
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INT32 i; |
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/* Allocate and fill in the conversion tables. */ |
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/* Allocate and fill in the conversion tables. */ |
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cconvert->rgb_y_tab = rgb_y_tab = (INT32 *) |
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cconvert->rgb_y_tab = rgb_y_tab = (INT32 *) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, TABLE_SIZE * SIZEOF(INT32)); |
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(TABLE_SIZE * SIZEOF(INT32))); |
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for (i = 0; i <= MAXJSAMPLE; i++) { |
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for (i = 0; i <= MAXJSAMPLE; i++) { |
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rgb_y_tab[i+R_Y_OFF] = FIX(0.299) * i; |
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rgb_y_tab[i+R_Y_OFF] = FIX(0.299) * i; |
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@ -286,8 +274,8 @@ rgb_gray_convert (j_decompress_ptr cinfo, |
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JSAMPARRAY output_buf, int num_rows) |
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JSAMPARRAY output_buf, int num_rows) |
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{ |
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{ |
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my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
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my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
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register INT32 * ctab = cconvert->rgb_y_tab; |
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register int r, g, b; |
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register int r, g, b; |
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register INT32 * ctab = cconvert->rgb_y_tab; |
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register JSAMPROW outptr; |
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register JSAMPROW outptr; |
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register JSAMPROW inptr0, inptr1, inptr2; |
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register JSAMPROW inptr0, inptr1, inptr2; |
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register JDIMENSION col; |
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register JDIMENSION col; |
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@ -313,6 +301,7 @@ rgb_gray_convert (j_decompress_ptr cinfo, |
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/*
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/*
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* Convert some rows of samples to the output colorspace. |
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* [R-G,G,B-G] to [R,G,B] conversion with modulo calculation |
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* [R-G,G,B-G] to [R,G,B] conversion with modulo calculation |
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* (inverse color transform). |
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* (inverse color transform). |
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* This can be seen as an adaption of the general YCbCr->RGB |
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* This can be seen as an adaption of the general YCbCr->RGB |
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@ -364,8 +353,8 @@ rgb1_gray_convert (j_decompress_ptr cinfo, |
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JSAMPARRAY output_buf, int num_rows) |
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JSAMPARRAY output_buf, int num_rows) |
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{ |
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{ |
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my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
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my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert; |
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register INT32 * ctab = cconvert->rgb_y_tab; |
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register int r, g, b; |
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register int r, g, b; |
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register INT32 * ctab = cconvert->rgb_y_tab; |
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register JSAMPROW outptr; |
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register JSAMPROW outptr; |
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register JSAMPROW inptr0, inptr1, inptr2; |
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register JSAMPROW inptr0, inptr1, inptr2; |
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register JDIMENSION col; |
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register JDIMENSION col; |
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@ -396,6 +385,7 @@ rgb1_gray_convert (j_decompress_ptr cinfo, |
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/*
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/*
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* Convert some rows of samples to the output colorspace. |
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* No colorspace change, but conversion from separate-planes |
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* No colorspace change, but conversion from separate-planes |
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* to interleaved representation. |
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* to interleaved representation. |
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*/ |
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*/ |
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@ -430,6 +420,7 @@ rgb_convert (j_decompress_ptr cinfo, |
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/*
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/*
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* Color conversion for no colorspace change: just copy the data, |
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* Color conversion for no colorspace change: just copy the data, |
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* converting from separate-planes to interleaved representation. |
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* converting from separate-planes to interleaved representation. |
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* We assume out_color_components == num_components. |
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*/ |
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*/ |
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METHODDEF(void) |
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METHODDEF(void) |
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@ -437,20 +428,21 @@ null_convert (j_decompress_ptr cinfo, |
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JSAMPIMAGE input_buf, JDIMENSION input_row, |
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JSAMPIMAGE input_buf, JDIMENSION input_row, |
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JSAMPARRAY output_buf, int num_rows) |
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JSAMPARRAY output_buf, int num_rows) |
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{ |
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{ |
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int ci; |
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register int nc = cinfo->num_components; |
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register JSAMPROW outptr; |
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register JSAMPROW outptr; |
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register JSAMPROW inptr; |
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register JSAMPROW inptr; |
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register JDIMENSION col; |
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register JDIMENSION count; |
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register int num_comps = cinfo->num_components; |
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JDIMENSION num_cols = cinfo->output_width; |
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JDIMENSION num_cols = cinfo->output_width; |
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int ci; |
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while (--num_rows >= 0) { |
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while (--num_rows >= 0) { |
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for (ci = 0; ci < nc; ci++) { |
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/* It seems fastest to make a separate pass for each component. */ |
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for (ci = 0; ci < num_comps; ci++) { |
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inptr = input_buf[ci][input_row]; |
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inptr = input_buf[ci][input_row]; |
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outptr = output_buf[0] + ci; |
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outptr = output_buf[0] + ci; |
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for (col = 0; col < num_cols; col++) { |
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for (count = num_cols; count > 0; count--) { |
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*outptr = *inptr++; /* needn't bother with GETJSAMPLE() here */ |
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*outptr = *inptr++; /* don't need GETJSAMPLE() here */ |
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outptr += nc; |
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outptr += num_comps; |
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} |
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} |
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} |
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} |
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input_row++; |
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input_row++; |
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@ -504,9 +496,10 @@ gray_rgb_convert (j_decompress_ptr cinfo, |
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/*
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/*
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* Adobe-style YCCK->CMYK conversion. |
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* Convert some rows of samples to the output colorspace. |
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* We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same |
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* This version handles Adobe-style YCCK->CMYK conversion, |
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* conversion as above, while passing K (black) unchanged. |
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* where we convert YCbCr to R=1-C, G=1-M, and B=1-Y using the |
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* same conversion as above, while passing K (black) unchanged. |
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* We assume build_ycc_rgb_table has been called. |
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* We assume build_ycc_rgb_table has been called. |
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*/ |
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*/ |
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@ -577,9 +570,8 @@ jinit_color_deconverter (j_decompress_ptr cinfo) |
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my_cconvert_ptr cconvert; |
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my_cconvert_ptr cconvert; |
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int ci; |
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int ci; |
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cconvert = (my_cconvert_ptr) |
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cconvert = (my_cconvert_ptr) (*cinfo->mem->alloc_small) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_color_deconverter)); |
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SIZEOF(my_color_deconverter)); |
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cinfo->cconvert = &cconvert->pub; |
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cinfo->cconvert = &cconvert->pub; |
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cconvert->pub.start_pass = start_pass_dcolor; |
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cconvert->pub.start_pass = start_pass_dcolor; |
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@ -607,7 +599,6 @@ jinit_color_deconverter (j_decompress_ptr cinfo) |
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default: /* JCS_UNKNOWN can be anything */ |
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default: /* JCS_UNKNOWN can be anything */ |
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if (cinfo->num_components < 1) |
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if (cinfo->num_components < 1) |
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ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
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ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
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break; |
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} |
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} |
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/* Support color transform only for RGB colorspaces */ |
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/* Support color transform only for RGB colorspaces */ |
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@ -684,7 +675,8 @@ jinit_color_deconverter (j_decompress_ptr cinfo) |
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case JCS_BG_RGB: |
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case JCS_BG_RGB: |
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cinfo->out_color_components = RGB_PIXELSIZE; |
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cinfo->out_color_components = RGB_PIXELSIZE; |
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if (cinfo->jpeg_color_space == JCS_BG_RGB) { |
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if (cinfo->jpeg_color_space != JCS_BG_RGB) |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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switch (cinfo->color_transform) { |
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switch (cinfo->color_transform) { |
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case JCT_NONE: |
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case JCT_NONE: |
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cconvert->pub.color_convert = rgb_convert; |
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cconvert->pub.color_convert = rgb_convert; |
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@ -695,8 +687,6 @@ jinit_color_deconverter (j_decompress_ptr cinfo) |
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default: |
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default: |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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} |
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} |
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} else |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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break; |
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break; |
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case JCS_CMYK: |
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case JCS_CMYK: |
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@ -714,14 +704,12 @@ jinit_color_deconverter (j_decompress_ptr cinfo) |
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} |
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} |
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break; |
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break; |
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default: |
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default: /* permit null conversion to same output space */ |
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/* Permit null conversion to same output space */ |
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if (cinfo->out_color_space != cinfo->jpeg_color_space) |
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if (cinfo->out_color_space == cinfo->jpeg_color_space) { |
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/* unsupported non-null conversion */ |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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cinfo->out_color_components = cinfo->num_components; |
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cinfo->out_color_components = cinfo->num_components; |
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cconvert->pub.color_convert = null_convert; |
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cconvert->pub.color_convert = null_convert; |
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} else /* unsupported non-null conversion */ |
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ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL); |
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break; |
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} |
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} |
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if (cinfo->quantize_colors) |
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if (cinfo->quantize_colors) |
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Alexander Alekhin
5 years ago