diff options
Diffstat (limited to 'jpeg/jdcolor.c')
| -rw-r--r-- | jpeg/jdcolor.c | 33 |
1 files changed, 8 insertions, 25 deletions
diff --git a/jpeg/jdcolor.c b/jpeg/jdcolor.c index a31c28615..0316354da 100644 --- a/jpeg/jdcolor.c +++ b/jpeg/jdcolor.c @@ -2,7 +2,7 @@ * jdcolor.c * * Copyright (C) 1991-1997, Thomas G. Lane. - * Modified 2011-2013 by Guido Vollbeding. + * Modified 2011-2017 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -14,6 +14,12 @@ #include "jpeglib.h" +#if RANGE_BITS < 2 + /* Deliberate syntax err */ + Sorry, this code requires 2 or more range extension bits. +#endif + + /* Private subobject */ typedef struct { @@ -25,9 +31,6 @@ typedef struct { INT32 * Cr_g_tab; /* => table for Cr to G conversion */ INT32 * Cb_g_tab; /* => table for Cb to G conversion */ - JSAMPLE * range_limit; /* pointer to normal sample range limit table, */ - /* or extended sample range limit table for BG_YCC */ - /* Private state for RGB->Y conversion */ INT32 * rgb_y_tab; /* => table for RGB to Y conversion */ } my_color_deconverter; @@ -134,8 +137,6 @@ build_ycc_rgb_table (j_decompress_ptr cinfo) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); - cconvert->range_limit = cinfo->sample_range_limit; - 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 */ @@ -176,10 +177,6 @@ build_bg_ycc_rgb_table (j_decompress_ptr cinfo) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE+1) * SIZEOF(INT32)); - cconvert->range_limit = (JSAMPLE *) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - 5 * (MAXJSAMPLE+1) * SIZEOF(JSAMPLE)); - 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 */ @@ -195,20 +192,6 @@ build_bg_ycc_rgb_table (j_decompress_ptr cinfo) /* We also add in ONE_HALF so that need not do it in inner loop */ cconvert->Cb_g_tab[i] = (- FIX(0.688272572)) * x + ONE_HALF; } - - /* Cb and Cr portions can extend to double range in wide gamut case, - * so we prepare an appropriate extended range limit table. - */ - - /* First segment of range limit table: limit[x] = 0 for x < 0 */ - MEMZERO(cconvert->range_limit, 2 * (MAXJSAMPLE+1) * SIZEOF(JSAMPLE)); - cconvert->range_limit += 2 * (MAXJSAMPLE+1); - /* Main part of range limit table: limit[x] = x */ - for (i = 0; i <= MAXJSAMPLE; i++) - cconvert->range_limit[i] = (JSAMPLE) i; - /* End of range limit table: limit[x] = MAXJSAMPLE for x > MAXJSAMPLE */ - for (; i < 3 * (MAXJSAMPLE+1); i++) - cconvert->range_limit[i] = MAXJSAMPLE; } @@ -235,7 +218,7 @@ ycc_rgb_convert (j_decompress_ptr cinfo, register JDIMENSION col; JDIMENSION num_cols = cinfo->output_width; /* copy these pointers into registers if possible */ - register JSAMPLE * range_limit = cconvert->range_limit; + 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; |