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/* pngrtran.c - transforms the data in a row for PNG readers
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*
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* Last changed in libpng 1.2.38 [July 16, 2009]
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* This file contains functions optionally called by an application
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* in order to tell libpng how to handle data when reading a PNG.
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* Transformations that are used in both reading and writing are
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* in pngtrans.c.
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*/
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#define PNG_INTERNAL
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#include "png.h"
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#if defined(PNG_READ_SUPPORTED)
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/* Set the action on getting a CRC error for an ancillary or critical chunk. */
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void PNGAPI
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png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
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{
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png_debug(1, "in png_set_crc_action");
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/* Tell libpng how we react to CRC errors in critical chunks */
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if (png_ptr == NULL)
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return;
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switch (crit_action)
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{
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case PNG_CRC_NO_CHANGE: /* Leave setting as is */
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break;
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case PNG_CRC_WARN_USE: /* Warn/use data */
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png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
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png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
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break;
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case PNG_CRC_QUIET_USE: /* Quiet/use data */
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png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
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png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
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PNG_FLAG_CRC_CRITICAL_IGNORE;
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break;
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case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */
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png_warning(png_ptr,
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"Can't discard critical data on CRC error.");
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case PNG_CRC_ERROR_QUIT: /* Error/quit */
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case PNG_CRC_DEFAULT:
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default:
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png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
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break;
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}
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switch (ancil_action)
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{
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case PNG_CRC_NO_CHANGE: /* Leave setting as is */
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break;
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case PNG_CRC_WARN_USE: /* Warn/use data */
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png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
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png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
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break;
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case PNG_CRC_QUIET_USE: /* Quiet/use data */
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png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
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png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
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PNG_FLAG_CRC_ANCILLARY_NOWARN;
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break;
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case PNG_CRC_ERROR_QUIT: /* Error/quit */
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png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
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png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
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break;
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case PNG_CRC_WARN_DISCARD: /* Warn/discard data */
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case PNG_CRC_DEFAULT:
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default:
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png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
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break;
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}
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}
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#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
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defined(PNG_FLOATING_POINT_SUPPORTED)
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/* Handle alpha and tRNS via a background color */
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void PNGAPI
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png_set_background(png_structp png_ptr,
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png_color_16p background_color, int background_gamma_code,
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int need_expand, double background_gamma)
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{
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png_debug(1, "in png_set_background");
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if (png_ptr == NULL)
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return;
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if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
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{
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png_warning(png_ptr, "Application must supply a known background gamma");
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return;
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}
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png_ptr->transformations |= PNG_BACKGROUND;
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png_memcpy(&(png_ptr->background), background_color,
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png_sizeof(png_color_16));
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png_ptr->background_gamma = (float)background_gamma;
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png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
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png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0);
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}
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#endif
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#if defined(PNG_READ_16_TO_8_SUPPORTED)
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/* Strip 16 bit depth files to 8 bit depth */
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void PNGAPI
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png_set_strip_16(png_structp png_ptr)
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{
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png_debug(1, "in png_set_strip_16");
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if (png_ptr == NULL)
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return;
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png_ptr->transformations |= PNG_16_TO_8;
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}
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#endif
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#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
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void PNGAPI
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png_set_strip_alpha(png_structp png_ptr)
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{
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png_debug(1, "in png_set_strip_alpha");
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if (png_ptr == NULL)
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return;
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png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
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}
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#endif
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#if defined(PNG_READ_DITHER_SUPPORTED)
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/* Dither file to 8 bit. Supply a palette, the current number
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* of elements in the palette, the maximum number of elements
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* allowed, and a histogram if possible. If the current number
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* of colors is greater then the maximum number, the palette will be
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* modified to fit in the maximum number. "full_dither" indicates
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* whether we need a dithering cube set up for RGB images, or if we
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* simply are reducing the number of colors in a paletted image.
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*/
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typedef struct png_dsort_struct
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{
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struct png_dsort_struct FAR * next;
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png_byte left;
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png_byte right;
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} png_dsort;
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typedef png_dsort FAR * png_dsortp;
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typedef png_dsort FAR * FAR * png_dsortpp;
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void PNGAPI
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png_set_dither(png_structp png_ptr, png_colorp palette,
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int num_palette, int maximum_colors, png_uint_16p histogram,
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int full_dither)
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{
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png_debug(1, "in png_set_dither");
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if (png_ptr == NULL)
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return;
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png_ptr->transformations |= PNG_DITHER;
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if (!full_dither)
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{
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int i;
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png_ptr->dither_index = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)(num_palette * png_sizeof(png_byte)));
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for (i = 0; i < num_palette; i++)
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png_ptr->dither_index[i] = (png_byte)i;
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}
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if (num_palette > maximum_colors)
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{
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if (histogram != NULL)
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{
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/* This is easy enough, just throw out the least used colors.
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* Perhaps not the best solution, but good enough.
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*/
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int i;
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/* Initialize an array to sort colors */
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png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)(num_palette * png_sizeof(png_byte)));
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/* Initialize the dither_sort array */
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for (i = 0; i < num_palette; i++)
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png_ptr->dither_sort[i] = (png_byte)i;
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/* Find the least used palette entries by starting a
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* bubble sort, and running it until we have sorted
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* out enough colors. Note that we don't care about
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* sorting all the colors, just finding which are
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* least used.
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*/
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for (i = num_palette - 1; i >= maximum_colors; i--)
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{
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int done; /* To stop early if the list is pre-sorted */
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int j;
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done = 1;
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for (j = 0; j < i; j++)
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{
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if (histogram[png_ptr->dither_sort[j]]
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< histogram[png_ptr->dither_sort[j + 1]])
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{
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png_byte t;
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t = png_ptr->dither_sort[j];
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png_ptr->dither_sort[j] = png_ptr->dither_sort[j + 1];
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png_ptr->dither_sort[j + 1] = t;
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done = 0;
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}
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}
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if (done)
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break;
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}
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/* Swap the palette around, and set up a table, if necessary */
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if (full_dither)
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{
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int j = num_palette;
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/* Put all the useful colors within the max, but don't
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* move the others.
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*/
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for (i = 0; i < maximum_colors; i++)
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{
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if ((int)png_ptr->dither_sort[i] >= maximum_colors)
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{
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do
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j--;
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while ((int)png_ptr->dither_sort[j] >= maximum_colors);
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palette[i] = palette[j];
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}
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}
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}
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else
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{
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int j = num_palette;
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/* Move all the used colors inside the max limit, and
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* develop a translation table.
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*/
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for (i = 0; i < maximum_colors; i++)
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{
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/* Only move the colors we need to */
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if ((int)png_ptr->dither_sort[i] >= maximum_colors)
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{
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png_color tmp_color;
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do
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j--;
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while ((int)png_ptr->dither_sort[j] >= maximum_colors);
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tmp_color = palette[j];
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palette[j] = palette[i];
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palette[i] = tmp_color;
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/* Indicate where the color went */
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png_ptr->dither_index[j] = (png_byte)i;
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png_ptr->dither_index[i] = (png_byte)j;
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}
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}
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/* Find closest color for those colors we are not using */
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for (i = 0; i < num_palette; i++)
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{
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if ((int)png_ptr->dither_index[i] >= maximum_colors)
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{
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int min_d, k, min_k, d_index;
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/* Find the closest color to one we threw out */
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d_index = png_ptr->dither_index[i];
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min_d = PNG_COLOR_DIST(palette[d_index], palette[0]);
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for (k = 1, min_k = 0; k < maximum_colors; k++)
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{
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int d;
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d = PNG_COLOR_DIST(palette[d_index], palette[k]);
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if (d < min_d)
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{
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min_d = d;
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min_k = k;
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}
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}
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/* Point to closest color */
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png_ptr->dither_index[i] = (png_byte)min_k;
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}
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}
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}
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png_free(png_ptr, png_ptr->dither_sort);
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png_ptr->dither_sort = NULL;
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}
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else
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{
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/* This is much harder to do simply (and quickly). Perhaps
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* we need to go through a median cut routine, but those
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* don't always behave themselves with only a few colors
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* as input. So we will just find the closest two colors,
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* and throw out one of them (chosen somewhat randomly).
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* [We don't understand this at all, so if someone wants to
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* work on improving it, be our guest - AED, GRP]
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*/
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310 |
int i;
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311 |
int max_d;
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int num_new_palette;
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313 |
png_dsortp t;
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png_dsortpp hash;
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t = NULL;
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317 |
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/* Initialize palette index arrays */
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png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)(num_palette * png_sizeof(png_byte)));
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png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
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(png_uint_32)(num_palette * png_sizeof(png_byte)));
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/* Initialize the sort array */
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for (i = 0; i < num_palette; i++)
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{
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png_ptr->index_to_palette[i] = (png_byte)i;
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png_ptr->palette_to_index[i] = (png_byte)i;
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}
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330 |
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hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 *
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png_sizeof(png_dsortp)));
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png_memset(hash, 0, 769 * png_sizeof(png_dsortp));
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num_new_palette = num_palette;
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336 |
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337 |
/* Initial wild guess at how far apart the farthest pixel
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338 |
* pair we will be eliminating will be. Larger
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339 |
* numbers mean more areas will be allocated, Smaller
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340 |
* numbers run the risk of not saving enough data, and
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341 |
* having to do this all over again.
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342 |
*
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343 |
* I have not done extensive checking on this number.
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344 |
*/
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345 |
max_d = 96;
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346 |
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347 |
while (num_new_palette > maximum_colors)
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348 |
{
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349 |
for (i = 0; i < num_new_palette - 1; i++)
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350 |
{
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351 |
int j;
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352 |
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353 |
for (j = i + 1; j < num_new_palette; j++)
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354 |
{
|
|
|
355 |
int d;
|
|
|
356 |
|
|
|
357 |
d = PNG_COLOR_DIST(palette[i], palette[j]);
|
|
|
358 |
|
|
|
359 |
if (d <= max_d)
|
|
|
360 |
{
|
|
|
361 |
|
|
|
362 |
t = (png_dsortp)png_malloc_warn(png_ptr,
|
|
|
363 |
(png_uint_32)(png_sizeof(png_dsort)));
|
|
|
364 |
if (t == NULL)
|
|
|
365 |
break;
|
|
|
366 |
t->next = hash[d];
|
|
|
367 |
t->left = (png_byte)i;
|
|
|
368 |
t->right = (png_byte)j;
|
|
|
369 |
hash[d] = t;
|
|
|
370 |
}
|
|
|
371 |
}
|
|
|
372 |
if (t == NULL)
|
|
|
373 |
break;
|
|
|
374 |
}
|
|
|
375 |
|
|
|
376 |
if (t != NULL)
|
|
|
377 |
for (i = 0; i <= max_d; i++)
|
|
|
378 |
{
|
|
|
379 |
if (hash[i] != NULL)
|
|
|
380 |
{
|
|
|
381 |
png_dsortp p;
|
|
|
382 |
|
|
|
383 |
for (p = hash[i]; p; p = p->next)
|
|
|
384 |
{
|
|
|
385 |
if ((int)png_ptr->index_to_palette[p->left]
|
|
|
386 |
< num_new_palette &&
|
|
|
387 |
(int)png_ptr->index_to_palette[p->right]
|
|
|
388 |
< num_new_palette)
|
|
|
389 |
{
|
|
|
390 |
int j, next_j;
|
|
|
391 |
|
|
|
392 |
if (num_new_palette & 0x01)
|
|
|
393 |
{
|
|
|
394 |
j = p->left;
|
|
|
395 |
next_j = p->right;
|
|
|
396 |
}
|
|
|
397 |
else
|
|
|
398 |
{
|
|
|
399 |
j = p->right;
|
|
|
400 |
next_j = p->left;
|
|
|
401 |
}
|
|
|
402 |
|
|
|
403 |
num_new_palette--;
|
|
|
404 |
palette[png_ptr->index_to_palette[j]]
|
|
|
405 |
= palette[num_new_palette];
|
|
|
406 |
if (!full_dither)
|
|
|
407 |
{
|
|
|
408 |
int k;
|
|
|
409 |
|
|
|
410 |
for (k = 0; k < num_palette; k++)
|
|
|
411 |
{
|
|
|
412 |
if (png_ptr->dither_index[k] ==
|
|
|
413 |
png_ptr->index_to_palette[j])
|
|
|
414 |
png_ptr->dither_index[k] =
|
|
|
415 |
png_ptr->index_to_palette[next_j];
|
|
|
416 |
if ((int)png_ptr->dither_index[k] ==
|
|
|
417 |
num_new_palette)
|
|
|
418 |
png_ptr->dither_index[k] =
|
|
|
419 |
png_ptr->index_to_palette[j];
|
|
|
420 |
}
|
|
|
421 |
}
|
|
|
422 |
|
|
|
423 |
png_ptr->index_to_palette[png_ptr->palette_to_index
|
|
|
424 |
[num_new_palette]] = png_ptr->index_to_palette[j];
|
|
|
425 |
png_ptr->palette_to_index[png_ptr->index_to_palette[j]]
|
|
|
426 |
= png_ptr->palette_to_index[num_new_palette];
|
|
|
427 |
|
|
|
428 |
png_ptr->index_to_palette[j] = (png_byte)num_new_palette;
|
|
|
429 |
png_ptr->palette_to_index[num_new_palette] = (png_byte)j;
|
|
|
430 |
}
|
|
|
431 |
if (num_new_palette <= maximum_colors)
|
|
|
432 |
break;
|
|
|
433 |
}
|
|
|
434 |
if (num_new_palette <= maximum_colors)
|
|
|
435 |
break;
|
|
|
436 |
}
|
|
|
437 |
}
|
|
|
438 |
|
|
|
439 |
for (i = 0; i < 769; i++)
|
|
|
440 |
{
|
|
|
441 |
if (hash[i] != NULL)
|
|
|
442 |
{
|
|
|
443 |
png_dsortp p = hash[i];
|
|
|
444 |
while (p)
|
|
|
445 |
{
|
|
|
446 |
t = p->next;
|
|
|
447 |
png_free(png_ptr, p);
|
|
|
448 |
p = t;
|
|
|
449 |
}
|
|
|
450 |
}
|
|
|
451 |
hash[i] = 0;
|
|
|
452 |
}
|
|
|
453 |
max_d += 96;
|
|
|
454 |
}
|
|
|
455 |
png_free(png_ptr, hash);
|
|
|
456 |
png_free(png_ptr, png_ptr->palette_to_index);
|
|
|
457 |
png_free(png_ptr, png_ptr->index_to_palette);
|
|
|
458 |
png_ptr->palette_to_index = NULL;
|
|
|
459 |
png_ptr->index_to_palette = NULL;
|
|
|
460 |
}
|
|
|
461 |
num_palette = maximum_colors;
|
|
|
462 |
}
|
|
|
463 |
if (png_ptr->palette == NULL)
|
|
|
464 |
{
|
|
|
465 |
png_ptr->palette = palette;
|
|
|
466 |
}
|
|
|
467 |
png_ptr->num_palette = (png_uint_16)num_palette;
|
|
|
468 |
|
|
|
469 |
if (full_dither)
|
|
|
470 |
{
|
|
|
471 |
int i;
|
|
|
472 |
png_bytep distance;
|
|
|
473 |
int total_bits = PNG_DITHER_RED_BITS + PNG_DITHER_GREEN_BITS +
|
|
|
474 |
PNG_DITHER_BLUE_BITS;
|
|
|
475 |
int num_red = (1 << PNG_DITHER_RED_BITS);
|
|
|
476 |
int num_green = (1 << PNG_DITHER_GREEN_BITS);
|
|
|
477 |
int num_blue = (1 << PNG_DITHER_BLUE_BITS);
|
|
|
478 |
png_size_t num_entries = ((png_size_t)1 << total_bits);
|
|
|
479 |
png_ptr->palette_lookup = (png_bytep )png_malloc(png_ptr,
|
|
|
480 |
(png_uint_32)(num_entries * png_sizeof(png_byte)));
|
|
|
481 |
png_memset(png_ptr->palette_lookup, 0, num_entries *
|
|
|
482 |
png_sizeof(png_byte));
|
|
|
483 |
|
|
|
484 |
distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries *
|
|
|
485 |
png_sizeof(png_byte)));
|
|
|
486 |
|
|
|
487 |
png_memset(distance, 0xff, num_entries * png_sizeof(png_byte));
|
|
|
488 |
|
|
|
489 |
for (i = 0; i < num_palette; i++)
|
|
|
490 |
{
|
|
|
491 |
int ir, ig, ib;
|
|
|
492 |
int r = (palette[i].red >> (8 - PNG_DITHER_RED_BITS));
|
|
|
493 |
int g = (palette[i].green >> (8 - PNG_DITHER_GREEN_BITS));
|
|
|
494 |
int b = (palette[i].blue >> (8 - PNG_DITHER_BLUE_BITS));
|
|
|
495 |
|
|
|
496 |
for (ir = 0; ir < num_red; ir++)
|
|
|
497 |
{
|
|
|
498 |
/* int dr = abs(ir - r); */
|
|
|
499 |
int dr = ((ir > r) ? ir - r : r - ir);
|
|
|
500 |
int index_r = (ir << (PNG_DITHER_BLUE_BITS + PNG_DITHER_GREEN_BITS));
|
|
|
501 |
|
|
|
502 |
for (ig = 0; ig < num_green; ig++)
|
|
|
503 |
{
|
|
|
504 |
/* int dg = abs(ig - g); */
|
|
|
505 |
int dg = ((ig > g) ? ig - g : g - ig);
|
|
|
506 |
int dt = dr + dg;
|
|
|
507 |
int dm = ((dr > dg) ? dr : dg);
|
|
|
508 |
int index_g = index_r | (ig << PNG_DITHER_BLUE_BITS);
|
|
|
509 |
|
|
|
510 |
for (ib = 0; ib < num_blue; ib++)
|
|
|
511 |
{
|
|
|
512 |
int d_index = index_g | ib;
|
|
|
513 |
/* int db = abs(ib - b); */
|
|
|
514 |
int db = ((ib > b) ? ib - b : b - ib);
|
|
|
515 |
int dmax = ((dm > db) ? dm : db);
|
|
|
516 |
int d = dmax + dt + db;
|
|
|
517 |
|
|
|
518 |
if (d < (int)distance[d_index])
|
|
|
519 |
{
|
|
|
520 |
distance[d_index] = (png_byte)d;
|
|
|
521 |
png_ptr->palette_lookup[d_index] = (png_byte)i;
|
|
|
522 |
}
|
|
|
523 |
}
|
|
|
524 |
}
|
|
|
525 |
}
|
|
|
526 |
}
|
|
|
527 |
|
|
|
528 |
png_free(png_ptr, distance);
|
|
|
529 |
}
|
|
|
530 |
}
|
|
|
531 |
#endif
|
|
|
532 |
|
|
|
533 |
#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
534 |
/* Transform the image from the file_gamma to the screen_gamma. We
|
|
|
535 |
* only do transformations on images where the file_gamma and screen_gamma
|
|
|
536 |
* are not close reciprocals, otherwise it slows things down slightly, and
|
|
|
537 |
* also needlessly introduces small errors.
|
|
|
538 |
*
|
|
|
539 |
* We will turn off gamma transformation later if no semitransparent entries
|
|
|
540 |
* are present in the tRNS array for palette images. We can't do it here
|
|
|
541 |
* because we don't necessarily have the tRNS chunk yet.
|
|
|
542 |
*/
|
|
|
543 |
void PNGAPI
|
|
|
544 |
png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
|
|
|
545 |
{
|
|
|
546 |
png_debug(1, "in png_set_gamma");
|
|
|
547 |
if (png_ptr == NULL)
|
|
|
548 |
return;
|
|
|
549 |
if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) ||
|
|
|
550 |
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ||
|
|
|
551 |
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
|
|
|
552 |
png_ptr->transformations |= PNG_GAMMA;
|
|
|
553 |
png_ptr->gamma = (float)file_gamma;
|
|
|
554 |
png_ptr->screen_gamma = (float)scrn_gamma;
|
|
|
555 |
}
|
|
|
556 |
#endif
|
|
|
557 |
|
|
|
558 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
559 |
/* Expand paletted images to RGB, expand grayscale images of
|
|
|
560 |
* less than 8-bit depth to 8-bit depth, and expand tRNS chunks
|
|
|
561 |
* to alpha channels.
|
|
|
562 |
*/
|
|
|
563 |
void PNGAPI
|
|
|
564 |
png_set_expand(png_structp png_ptr)
|
|
|
565 |
{
|
|
|
566 |
png_debug(1, "in png_set_expand");
|
|
|
567 |
if (png_ptr == NULL)
|
|
|
568 |
return;
|
|
|
569 |
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
|
|
|
570 |
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
|
|
|
571 |
}
|
|
|
572 |
|
|
|
573 |
/* GRR 19990627: the following three functions currently are identical
|
|
|
574 |
* to png_set_expand(). However, it is entirely reasonable that someone
|
|
|
575 |
* might wish to expand an indexed image to RGB but *not* expand a single,
|
|
|
576 |
* fully transparent palette entry to a full alpha channel--perhaps instead
|
|
|
577 |
* convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace
|
|
|
578 |
* the transparent color with a particular RGB value, or drop tRNS entirely.
|
|
|
579 |
* IOW, a future version of the library may make the transformations flag
|
|
|
580 |
* a bit more fine-grained, with separate bits for each of these three
|
|
|
581 |
* functions.
|
|
|
582 |
*
|
|
|
583 |
* More to the point, these functions make it obvious what libpng will be
|
|
|
584 |
* doing, whereas "expand" can (and does) mean any number of things.
|
|
|
585 |
*
|
|
|
586 |
* GRP 20060307: In libpng-1.4.0, png_set_gray_1_2_4_to_8() was modified
|
|
|
587 |
* to expand only the sample depth but not to expand the tRNS to alpha.
|
|
|
588 |
*/
|
|
|
589 |
|
|
|
590 |
/* Expand paletted images to RGB. */
|
|
|
591 |
void PNGAPI
|
|
|
592 |
png_set_palette_to_rgb(png_structp png_ptr)
|
|
|
593 |
{
|
|
|
594 |
png_debug(1, "in png_set_palette_to_rgb");
|
|
|
595 |
if (png_ptr == NULL)
|
|
|
596 |
return;
|
|
|
597 |
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
|
|
|
598 |
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
|
|
|
599 |
}
|
|
|
600 |
|
|
|
601 |
#if !defined(PNG_1_0_X)
|
|
|
602 |
/* Expand grayscale images of less than 8-bit depth to 8 bits. */
|
|
|
603 |
void PNGAPI
|
|
|
604 |
png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
|
|
|
605 |
{
|
|
|
606 |
png_debug(1, "in png_set_expand_gray_1_2_4_to_8");
|
|
|
607 |
if (png_ptr == NULL)
|
|
|
608 |
return;
|
|
|
609 |
png_ptr->transformations |= PNG_EXPAND;
|
|
|
610 |
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
|
|
|
611 |
}
|
|
|
612 |
#endif
|
|
|
613 |
|
|
|
614 |
#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
|
|
|
615 |
/* Expand grayscale images of less than 8-bit depth to 8 bits. */
|
|
|
616 |
/* Deprecated as of libpng-1.2.9 */
|
|
|
617 |
void PNGAPI
|
|
|
618 |
png_set_gray_1_2_4_to_8(png_structp png_ptr)
|
|
|
619 |
{
|
|
|
620 |
png_debug(1, "in png_set_gray_1_2_4_to_8");
|
|
|
621 |
if (png_ptr == NULL)
|
|
|
622 |
return;
|
|
|
623 |
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
|
|
|
624 |
}
|
|
|
625 |
#endif
|
|
|
626 |
|
|
|
627 |
|
|
|
628 |
/* Expand tRNS chunks to alpha channels. */
|
|
|
629 |
void PNGAPI
|
|
|
630 |
png_set_tRNS_to_alpha(png_structp png_ptr)
|
|
|
631 |
{
|
|
|
632 |
png_debug(1, "in png_set_tRNS_to_alpha");
|
|
|
633 |
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
|
|
|
634 |
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
|
|
|
635 |
}
|
|
|
636 |
#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
|
|
|
637 |
|
|
|
638 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
639 |
void PNGAPI
|
|
|
640 |
png_set_gray_to_rgb(png_structp png_ptr)
|
|
|
641 |
{
|
|
|
642 |
png_debug(1, "in png_set_gray_to_rgb");
|
|
|
643 |
png_ptr->transformations |= PNG_GRAY_TO_RGB;
|
|
|
644 |
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
|
|
|
645 |
}
|
|
|
646 |
#endif
|
|
|
647 |
|
|
|
648 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
649 |
#if defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
650 |
/* Convert a RGB image to a grayscale of the same width. This allows us,
|
|
|
651 |
* for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
|
|
|
652 |
*/
|
|
|
653 |
|
|
|
654 |
void PNGAPI
|
|
|
655 |
png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
|
|
|
656 |
double green)
|
|
|
657 |
{
|
|
|
658 |
int red_fixed = (int)((float)red*100000.0 + 0.5);
|
|
|
659 |
int green_fixed = (int)((float)green*100000.0 + 0.5);
|
|
|
660 |
if (png_ptr == NULL)
|
|
|
661 |
return;
|
|
|
662 |
png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
|
|
|
663 |
}
|
|
|
664 |
#endif
|
|
|
665 |
|
|
|
666 |
void PNGAPI
|
|
|
667 |
png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
|
|
|
668 |
png_fixed_point red, png_fixed_point green)
|
|
|
669 |
{
|
|
|
670 |
png_debug(1, "in png_set_rgb_to_gray");
|
|
|
671 |
if (png_ptr == NULL)
|
|
|
672 |
return;
|
|
|
673 |
switch(error_action)
|
|
|
674 |
{
|
|
|
675 |
case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY;
|
|
|
676 |
break;
|
|
|
677 |
|
|
|
678 |
case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN;
|
|
|
679 |
break;
|
|
|
680 |
|
|
|
681 |
case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR;
|
|
|
682 |
}
|
|
|
683 |
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
684 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
685 |
png_ptr->transformations |= PNG_EXPAND;
|
|
|
686 |
#else
|
|
|
687 |
{
|
|
|
688 |
png_warning(png_ptr,
|
|
|
689 |
"Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
|
|
|
690 |
png_ptr->transformations &= ~PNG_RGB_TO_GRAY;
|
|
|
691 |
}
|
|
|
692 |
#endif
|
|
|
693 |
{
|
|
|
694 |
png_uint_16 red_int, green_int;
|
|
|
695 |
if (red < 0 || green < 0)
|
|
|
696 |
{
|
|
|
697 |
red_int = 6968; /* .212671 * 32768 + .5 */
|
|
|
698 |
green_int = 23434; /* .715160 * 32768 + .5 */
|
|
|
699 |
}
|
|
|
700 |
else if (red + green < 100000L)
|
|
|
701 |
{
|
|
|
702 |
red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
|
|
|
703 |
green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
|
|
|
704 |
}
|
|
|
705 |
else
|
|
|
706 |
{
|
|
|
707 |
png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
|
|
|
708 |
red_int = 6968;
|
|
|
709 |
green_int = 23434;
|
|
|
710 |
}
|
|
|
711 |
png_ptr->rgb_to_gray_red_coeff = red_int;
|
|
|
712 |
png_ptr->rgb_to_gray_green_coeff = green_int;
|
|
|
713 |
png_ptr->rgb_to_gray_blue_coeff =
|
|
|
714 |
(png_uint_16)(32768 - red_int - green_int);
|
|
|
715 |
}
|
|
|
716 |
}
|
|
|
717 |
#endif
|
|
|
718 |
|
|
|
719 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
720 |
defined(PNG_LEGACY_SUPPORTED) || \
|
|
|
721 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
|
722 |
void PNGAPI
|
|
|
723 |
png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
|
|
|
724 |
read_user_transform_fn)
|
|
|
725 |
{
|
|
|
726 |
png_debug(1, "in png_set_read_user_transform_fn");
|
|
|
727 |
if (png_ptr == NULL)
|
|
|
728 |
return;
|
|
|
729 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
|
|
|
730 |
png_ptr->transformations |= PNG_USER_TRANSFORM;
|
|
|
731 |
png_ptr->read_user_transform_fn = read_user_transform_fn;
|
|
|
732 |
#endif
|
|
|
733 |
#ifdef PNG_LEGACY_SUPPORTED
|
|
|
734 |
if (read_user_transform_fn)
|
|
|
735 |
png_warning(png_ptr,
|
|
|
736 |
"This version of libpng does not support user transforms");
|
|
|
737 |
#endif
|
|
|
738 |
}
|
|
|
739 |
#endif
|
|
|
740 |
|
|
|
741 |
/* Initialize everything needed for the read. This includes modifying
|
|
|
742 |
* the palette.
|
|
|
743 |
*/
|
|
|
744 |
void /* PRIVATE */
|
|
|
745 |
png_init_read_transformations(png_structp png_ptr)
|
|
|
746 |
{
|
|
|
747 |
png_debug(1, "in png_init_read_transformations");
|
|
|
748 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
749 |
if (png_ptr != NULL)
|
|
|
750 |
#endif
|
|
|
751 |
{
|
|
|
752 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \
|
|
|
753 |
|| defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
754 |
int color_type = png_ptr->color_type;
|
|
|
755 |
#endif
|
|
|
756 |
|
|
|
757 |
#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
758 |
|
|
|
759 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
760 |
/* Detect gray background and attempt to enable optimization
|
|
|
761 |
* for gray --> RGB case
|
|
|
762 |
*
|
|
|
763 |
* Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or
|
|
|
764 |
* RGB_ALPHA (in which case need_expand is superfluous anyway), the
|
|
|
765 |
* background color might actually be gray yet not be flagged as such.
|
|
|
766 |
* This is not a problem for the current code, which uses
|
|
|
767 |
* PNG_BACKGROUND_IS_GRAY only to decide when to do the
|
|
|
768 |
* png_do_gray_to_rgb() transformation.
|
|
|
769 |
*/
|
|
|
770 |
if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
|
|
|
771 |
!(color_type & PNG_COLOR_MASK_COLOR))
|
|
|
772 |
{
|
|
|
773 |
png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
|
|
|
774 |
} else if ((png_ptr->transformations & PNG_BACKGROUND) &&
|
|
|
775 |
!(png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
|
|
|
776 |
(png_ptr->transformations & PNG_GRAY_TO_RGB) &&
|
|
|
777 |
png_ptr->background.red == png_ptr->background.green &&
|
|
|
778 |
png_ptr->background.red == png_ptr->background.blue)
|
|
|
779 |
{
|
|
|
780 |
png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
|
|
|
781 |
png_ptr->background.gray = png_ptr->background.red;
|
|
|
782 |
}
|
|
|
783 |
#endif
|
|
|
784 |
|
|
|
785 |
if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
|
|
|
786 |
(png_ptr->transformations & PNG_EXPAND))
|
|
|
787 |
{
|
|
|
788 |
if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */
|
|
|
789 |
{
|
|
|
790 |
/* Expand background and tRNS chunks */
|
|
|
791 |
switch (png_ptr->bit_depth)
|
|
|
792 |
{
|
|
|
793 |
case 1:
|
|
|
794 |
png_ptr->background.gray *= (png_uint_16)0xff;
|
|
|
795 |
png_ptr->background.red = png_ptr->background.green
|
|
|
796 |
= png_ptr->background.blue = png_ptr->background.gray;
|
|
|
797 |
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
798 |
{
|
|
|
799 |
png_ptr->trans_values.gray *= (png_uint_16)0xff;
|
|
|
800 |
png_ptr->trans_values.red = png_ptr->trans_values.green
|
|
|
801 |
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
|
|
|
802 |
}
|
|
|
803 |
break;
|
|
|
804 |
|
|
|
805 |
case 2:
|
|
|
806 |
png_ptr->background.gray *= (png_uint_16)0x55;
|
|
|
807 |
png_ptr->background.red = png_ptr->background.green
|
|
|
808 |
= png_ptr->background.blue = png_ptr->background.gray;
|
|
|
809 |
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
810 |
{
|
|
|
811 |
png_ptr->trans_values.gray *= (png_uint_16)0x55;
|
|
|
812 |
png_ptr->trans_values.red = png_ptr->trans_values.green
|
|
|
813 |
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
|
|
|
814 |
}
|
|
|
815 |
break;
|
|
|
816 |
|
|
|
817 |
case 4:
|
|
|
818 |
png_ptr->background.gray *= (png_uint_16)0x11;
|
|
|
819 |
png_ptr->background.red = png_ptr->background.green
|
|
|
820 |
= png_ptr->background.blue = png_ptr->background.gray;
|
|
|
821 |
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
822 |
{
|
|
|
823 |
png_ptr->trans_values.gray *= (png_uint_16)0x11;
|
|
|
824 |
png_ptr->trans_values.red = png_ptr->trans_values.green
|
|
|
825 |
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
|
|
|
826 |
}
|
|
|
827 |
break;
|
|
|
828 |
|
|
|
829 |
case 8:
|
|
|
830 |
|
|
|
831 |
case 16:
|
|
|
832 |
png_ptr->background.red = png_ptr->background.green
|
|
|
833 |
= png_ptr->background.blue = png_ptr->background.gray;
|
|
|
834 |
break;
|
|
|
835 |
}
|
|
|
836 |
}
|
|
|
837 |
else if (color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
838 |
{
|
|
|
839 |
png_ptr->background.red =
|
|
|
840 |
png_ptr->palette[png_ptr->background.index].red;
|
|
|
841 |
png_ptr->background.green =
|
|
|
842 |
png_ptr->palette[png_ptr->background.index].green;
|
|
|
843 |
png_ptr->background.blue =
|
|
|
844 |
png_ptr->palette[png_ptr->background.index].blue;
|
|
|
845 |
|
|
|
846 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
|
|
|
847 |
if (png_ptr->transformations & PNG_INVERT_ALPHA)
|
|
|
848 |
{
|
|
|
849 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
850 |
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
851 |
#endif
|
|
|
852 |
{
|
|
|
853 |
/* Invert the alpha channel (in tRNS) unless the pixels are
|
|
|
854 |
* going to be expanded, in which case leave it for later
|
|
|
855 |
*/
|
|
|
856 |
int i, istop;
|
|
|
857 |
istop=(int)png_ptr->num_trans;
|
|
|
858 |
for (i=0; i<istop; i++)
|
|
|
859 |
png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]);
|
|
|
860 |
}
|
|
|
861 |
}
|
|
|
862 |
#endif
|
|
|
863 |
|
|
|
864 |
}
|
|
|
865 |
}
|
|
|
866 |
#endif
|
|
|
867 |
|
|
|
868 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
869 |
png_ptr->background_1 = png_ptr->background;
|
|
|
870 |
#endif
|
|
|
871 |
#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
872 |
|
|
|
873 |
if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0)
|
|
|
874 |
&& (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0)
|
|
|
875 |
< PNG_GAMMA_THRESHOLD))
|
|
|
876 |
{
|
|
|
877 |
int i, k;
|
|
|
878 |
k=0;
|
|
|
879 |
for (i=0; i<png_ptr->num_trans; i++)
|
|
|
880 |
{
|
|
|
881 |
if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff)
|
|
|
882 |
k=1; /* Partial transparency is present */
|
|
|
883 |
}
|
|
|
884 |
if (k == 0)
|
|
|
885 |
png_ptr->transformations &= ~PNG_GAMMA;
|
|
|
886 |
}
|
|
|
887 |
|
|
|
888 |
if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) &&
|
|
|
889 |
png_ptr->gamma != 0.0)
|
|
|
890 |
{
|
|
|
891 |
png_build_gamma_table(png_ptr);
|
|
|
892 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
893 |
if (png_ptr->transformations & PNG_BACKGROUND)
|
|
|
894 |
{
|
|
|
895 |
if (color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
896 |
{
|
|
|
897 |
/* Could skip if no transparency */
|
|
|
898 |
png_color back, back_1;
|
|
|
899 |
png_colorp palette = png_ptr->palette;
|
|
|
900 |
int num_palette = png_ptr->num_palette;
|
|
|
901 |
int i;
|
|
|
902 |
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
|
|
|
903 |
{
|
|
|
904 |
back.red = png_ptr->gamma_table[png_ptr->background.red];
|
|
|
905 |
back.green = png_ptr->gamma_table[png_ptr->background.green];
|
|
|
906 |
back.blue = png_ptr->gamma_table[png_ptr->background.blue];
|
|
|
907 |
|
|
|
908 |
back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
|
|
|
909 |
back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
|
|
|
910 |
back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
|
|
|
911 |
}
|
|
|
912 |
else
|
|
|
913 |
{
|
|
|
914 |
double g, gs;
|
|
|
915 |
|
|
|
916 |
switch (png_ptr->background_gamma_type)
|
|
|
917 |
{
|
|
|
918 |
case PNG_BACKGROUND_GAMMA_SCREEN:
|
|
|
919 |
g = (png_ptr->screen_gamma);
|
|
|
920 |
gs = 1.0;
|
|
|
921 |
break;
|
|
|
922 |
|
|
|
923 |
case PNG_BACKGROUND_GAMMA_FILE:
|
|
|
924 |
g = 1.0 / (png_ptr->gamma);
|
|
|
925 |
gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
|
|
|
926 |
break;
|
|
|
927 |
|
|
|
928 |
case PNG_BACKGROUND_GAMMA_UNIQUE:
|
|
|
929 |
g = 1.0 / (png_ptr->background_gamma);
|
|
|
930 |
gs = 1.0 / (png_ptr->background_gamma *
|
|
|
931 |
png_ptr->screen_gamma);
|
|
|
932 |
break;
|
|
|
933 |
default:
|
|
|
934 |
g = 1.0; /* back_1 */
|
|
|
935 |
gs = 1.0; /* back */
|
|
|
936 |
}
|
|
|
937 |
|
|
|
938 |
if ( fabs(gs - 1.0) < PNG_GAMMA_THRESHOLD)
|
|
|
939 |
{
|
|
|
940 |
back.red = (png_byte)png_ptr->background.red;
|
|
|
941 |
back.green = (png_byte)png_ptr->background.green;
|
|
|
942 |
back.blue = (png_byte)png_ptr->background.blue;
|
|
|
943 |
}
|
|
|
944 |
else
|
|
|
945 |
{
|
|
|
946 |
back.red = (png_byte)(pow(
|
|
|
947 |
(double)png_ptr->background.red/255, gs) * 255.0 + .5);
|
|
|
948 |
back.green = (png_byte)(pow(
|
|
|
949 |
(double)png_ptr->background.green/255, gs) * 255.0 + .5);
|
|
|
950 |
back.blue = (png_byte)(pow(
|
|
|
951 |
(double)png_ptr->background.blue/255, gs) * 255.0 + .5);
|
|
|
952 |
}
|
|
|
953 |
|
|
|
954 |
back_1.red = (png_byte)(pow(
|
|
|
955 |
(double)png_ptr->background.red/255, g) * 255.0 + .5);
|
|
|
956 |
back_1.green = (png_byte)(pow(
|
|
|
957 |
(double)png_ptr->background.green/255, g) * 255.0 + .5);
|
|
|
958 |
back_1.blue = (png_byte)(pow(
|
|
|
959 |
(double)png_ptr->background.blue/255, g) * 255.0 + .5);
|
|
|
960 |
}
|
|
|
961 |
for (i = 0; i < num_palette; i++)
|
|
|
962 |
{
|
|
|
963 |
if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff)
|
|
|
964 |
{
|
|
|
965 |
if (png_ptr->trans[i] == 0)
|
|
|
966 |
{
|
|
|
967 |
palette[i] = back;
|
|
|
968 |
}
|
|
|
969 |
else /* if (png_ptr->trans[i] != 0xff) */
|
|
|
970 |
{
|
|
|
971 |
png_byte v, w;
|
|
|
972 |
|
|
|
973 |
v = png_ptr->gamma_to_1[palette[i].red];
|
|
|
974 |
png_composite(w, v, png_ptr->trans[i], back_1.red);
|
|
|
975 |
palette[i].red = png_ptr->gamma_from_1[w];
|
|
|
976 |
|
|
|
977 |
v = png_ptr->gamma_to_1[palette[i].green];
|
|
|
978 |
png_composite(w, v, png_ptr->trans[i], back_1.green);
|
|
|
979 |
palette[i].green = png_ptr->gamma_from_1[w];
|
|
|
980 |
|
|
|
981 |
v = png_ptr->gamma_to_1[palette[i].blue];
|
|
|
982 |
png_composite(w, v, png_ptr->trans[i], back_1.blue);
|
|
|
983 |
palette[i].blue = png_ptr->gamma_from_1[w];
|
|
|
984 |
}
|
|
|
985 |
}
|
|
|
986 |
else
|
|
|
987 |
{
|
|
|
988 |
palette[i].red = png_ptr->gamma_table[palette[i].red];
|
|
|
989 |
palette[i].green = png_ptr->gamma_table[palette[i].green];
|
|
|
990 |
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
|
|
|
991 |
}
|
|
|
992 |
}
|
|
|
993 |
/* Prevent the transformations being done again, and make sure
|
|
|
994 |
* that the now spurious alpha channel is stripped - the code
|
|
|
995 |
* has just reduced background composition and gamma correction
|
|
|
996 |
* to a simple alpha channel strip.
|
|
|
997 |
*/
|
|
|
998 |
png_ptr->transformations &= ~PNG_BACKGROUND;
|
|
|
999 |
png_ptr->transformations &= ~PNG_GAMMA;
|
|
|
1000 |
png_ptr->transformations |= PNG_STRIP_ALPHA;
|
|
|
1001 |
}
|
|
|
1002 |
/* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
|
|
|
1003 |
else
|
|
|
1004 |
/* color_type != PNG_COLOR_TYPE_PALETTE */
|
|
|
1005 |
{
|
|
|
1006 |
double m = (double)(((png_uint_32)1 << png_ptr->bit_depth) - 1);
|
|
|
1007 |
double g = 1.0;
|
|
|
1008 |
double gs = 1.0;
|
|
|
1009 |
|
|
|
1010 |
switch (png_ptr->background_gamma_type)
|
|
|
1011 |
{
|
|
|
1012 |
case PNG_BACKGROUND_GAMMA_SCREEN:
|
|
|
1013 |
g = (png_ptr->screen_gamma);
|
|
|
1014 |
gs = 1.0;
|
|
|
1015 |
break;
|
|
|
1016 |
|
|
|
1017 |
case PNG_BACKGROUND_GAMMA_FILE:
|
|
|
1018 |
g = 1.0 / (png_ptr->gamma);
|
|
|
1019 |
gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
|
|
|
1020 |
break;
|
|
|
1021 |
|
|
|
1022 |
case PNG_BACKGROUND_GAMMA_UNIQUE:
|
|
|
1023 |
g = 1.0 / (png_ptr->background_gamma);
|
|
|
1024 |
gs = 1.0 / (png_ptr->background_gamma *
|
|
|
1025 |
png_ptr->screen_gamma);
|
|
|
1026 |
break;
|
|
|
1027 |
}
|
|
|
1028 |
|
|
|
1029 |
png_ptr->background_1.gray = (png_uint_16)(pow(
|
|
|
1030 |
(double)png_ptr->background.gray / m, g) * m + .5);
|
|
|
1031 |
png_ptr->background.gray = (png_uint_16)(pow(
|
|
|
1032 |
(double)png_ptr->background.gray / m, gs) * m + .5);
|
|
|
1033 |
|
|
|
1034 |
if ((png_ptr->background.red != png_ptr->background.green) ||
|
|
|
1035 |
(png_ptr->background.red != png_ptr->background.blue) ||
|
|
|
1036 |
(png_ptr->background.red != png_ptr->background.gray))
|
|
|
1037 |
{
|
|
|
1038 |
/* RGB or RGBA with color background */
|
|
|
1039 |
png_ptr->background_1.red = (png_uint_16)(pow(
|
|
|
1040 |
(double)png_ptr->background.red / m, g) * m + .5);
|
|
|
1041 |
png_ptr->background_1.green = (png_uint_16)(pow(
|
|
|
1042 |
(double)png_ptr->background.green / m, g) * m + .5);
|
|
|
1043 |
png_ptr->background_1.blue = (png_uint_16)(pow(
|
|
|
1044 |
(double)png_ptr->background.blue / m, g) * m + .5);
|
|
|
1045 |
png_ptr->background.red = (png_uint_16)(pow(
|
|
|
1046 |
(double)png_ptr->background.red / m, gs) * m + .5);
|
|
|
1047 |
png_ptr->background.green = (png_uint_16)(pow(
|
|
|
1048 |
(double)png_ptr->background.green / m, gs) * m + .5);
|
|
|
1049 |
png_ptr->background.blue = (png_uint_16)(pow(
|
|
|
1050 |
(double)png_ptr->background.blue / m, gs) * m + .5);
|
|
|
1051 |
}
|
|
|
1052 |
else
|
|
|
1053 |
{
|
|
|
1054 |
/* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */
|
|
|
1055 |
png_ptr->background_1.red = png_ptr->background_1.green
|
|
|
1056 |
= png_ptr->background_1.blue = png_ptr->background_1.gray;
|
|
|
1057 |
png_ptr->background.red = png_ptr->background.green
|
|
|
1058 |
= png_ptr->background.blue = png_ptr->background.gray;
|
|
|
1059 |
}
|
|
|
1060 |
}
|
|
|
1061 |
}
|
|
|
1062 |
else
|
|
|
1063 |
/* Transformation does not include PNG_BACKGROUND */
|
|
|
1064 |
#endif /* PNG_READ_BACKGROUND_SUPPORTED */
|
|
|
1065 |
if (color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
1066 |
{
|
|
|
1067 |
png_colorp palette = png_ptr->palette;
|
|
|
1068 |
int num_palette = png_ptr->num_palette;
|
|
|
1069 |
int i;
|
|
|
1070 |
|
|
|
1071 |
for (i = 0; i < num_palette; i++)
|
|
|
1072 |
{
|
|
|
1073 |
palette[i].red = png_ptr->gamma_table[palette[i].red];
|
|
|
1074 |
palette[i].green = png_ptr->gamma_table[palette[i].green];
|
|
|
1075 |
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
|
|
|
1076 |
}
|
|
|
1077 |
|
|
|
1078 |
/* Done the gamma correction. */
|
|
|
1079 |
png_ptr->transformations &= ~PNG_GAMMA;
|
|
|
1080 |
}
|
|
|
1081 |
}
|
|
|
1082 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1083 |
else
|
|
|
1084 |
#endif
|
|
|
1085 |
#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */
|
|
|
1086 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1087 |
/* No GAMMA transformation */
|
|
|
1088 |
if ((png_ptr->transformations & PNG_BACKGROUND) &&
|
|
|
1089 |
(color_type == PNG_COLOR_TYPE_PALETTE))
|
|
|
1090 |
{
|
|
|
1091 |
int i;
|
|
|
1092 |
int istop = (int)png_ptr->num_trans;
|
|
|
1093 |
png_color back;
|
|
|
1094 |
png_colorp palette = png_ptr->palette;
|
|
|
1095 |
|
|
|
1096 |
back.red = (png_byte)png_ptr->background.red;
|
|
|
1097 |
back.green = (png_byte)png_ptr->background.green;
|
|
|
1098 |
back.blue = (png_byte)png_ptr->background.blue;
|
|
|
1099 |
|
|
|
1100 |
for (i = 0; i < istop; i++)
|
|
|
1101 |
{
|
|
|
1102 |
if (png_ptr->trans[i] == 0)
|
|
|
1103 |
{
|
|
|
1104 |
palette[i] = back;
|
|
|
1105 |
}
|
|
|
1106 |
else if (png_ptr->trans[i] != 0xff)
|
|
|
1107 |
{
|
|
|
1108 |
/* The png_composite() macro is defined in png.h */
|
|
|
1109 |
png_composite(palette[i].red, palette[i].red,
|
|
|
1110 |
png_ptr->trans[i], back.red);
|
|
|
1111 |
png_composite(palette[i].green, palette[i].green,
|
|
|
1112 |
png_ptr->trans[i], back.green);
|
|
|
1113 |
png_composite(palette[i].blue, palette[i].blue,
|
|
|
1114 |
png_ptr->trans[i], back.blue);
|
|
|
1115 |
}
|
|
|
1116 |
}
|
|
|
1117 |
|
|
|
1118 |
/* Handled alpha, still need to strip the channel. */
|
|
|
1119 |
png_ptr->transformations &= ~PNG_BACKGROUND;
|
|
|
1120 |
png_ptr->transformations |= PNG_STRIP_ALPHA;
|
|
|
1121 |
}
|
|
|
1122 |
#endif /* PNG_READ_BACKGROUND_SUPPORTED */
|
|
|
1123 |
|
|
|
1124 |
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
|
1125 |
if ((png_ptr->transformations & PNG_SHIFT) &&
|
|
|
1126 |
(color_type == PNG_COLOR_TYPE_PALETTE))
|
|
|
1127 |
{
|
|
|
1128 |
png_uint_16 i;
|
|
|
1129 |
png_uint_16 istop = png_ptr->num_palette;
|
|
|
1130 |
int sr = 8 - png_ptr->sig_bit.red;
|
|
|
1131 |
int sg = 8 - png_ptr->sig_bit.green;
|
|
|
1132 |
int sb = 8 - png_ptr->sig_bit.blue;
|
|
|
1133 |
|
|
|
1134 |
if (sr < 0 || sr > 8)
|
|
|
1135 |
sr = 0;
|
|
|
1136 |
if (sg < 0 || sg > 8)
|
|
|
1137 |
sg = 0;
|
|
|
1138 |
if (sb < 0 || sb > 8)
|
|
|
1139 |
sb = 0;
|
|
|
1140 |
for (i = 0; i < istop; i++)
|
|
|
1141 |
{
|
|
|
1142 |
png_ptr->palette[i].red >>= sr;
|
|
|
1143 |
png_ptr->palette[i].green >>= sg;
|
|
|
1144 |
png_ptr->palette[i].blue >>= sb;
|
|
|
1145 |
}
|
|
|
1146 |
}
|
|
|
1147 |
#endif /* PNG_READ_SHIFT_SUPPORTED */
|
|
|
1148 |
}
|
|
|
1149 |
#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
|
|
|
1150 |
&& !defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1151 |
if (png_ptr)
|
|
|
1152 |
return;
|
|
|
1153 |
#endif
|
|
|
1154 |
}
|
|
|
1155 |
|
|
|
1156 |
/* Modify the info structure to reflect the transformations. The
|
|
|
1157 |
* info should be updated so a PNG file could be written with it,
|
|
|
1158 |
* assuming the transformations result in valid PNG data.
|
|
|
1159 |
*/
|
|
|
1160 |
void /* PRIVATE */
|
|
|
1161 |
png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
|
|
|
1162 |
{
|
|
|
1163 |
png_debug(1, "in png_read_transform_info");
|
|
|
1164 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
1165 |
if (png_ptr->transformations & PNG_EXPAND)
|
|
|
1166 |
{
|
|
|
1167 |
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
1168 |
{
|
|
|
1169 |
if (png_ptr->num_trans &&
|
|
|
1170 |
(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
1171 |
info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
|
1172 |
else
|
|
|
1173 |
info_ptr->color_type = PNG_COLOR_TYPE_RGB;
|
|
|
1174 |
info_ptr->bit_depth = 8;
|
|
|
1175 |
info_ptr->num_trans = 0;
|
|
|
1176 |
}
|
|
|
1177 |
else
|
|
|
1178 |
{
|
|
|
1179 |
if (png_ptr->num_trans)
|
|
|
1180 |
{
|
|
|
1181 |
if (png_ptr->transformations & PNG_EXPAND_tRNS)
|
|
|
1182 |
info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
|
|
|
1183 |
}
|
|
|
1184 |
if (info_ptr->bit_depth < 8)
|
|
|
1185 |
info_ptr->bit_depth = 8;
|
|
|
1186 |
info_ptr->num_trans = 0;
|
|
|
1187 |
}
|
|
|
1188 |
}
|
|
|
1189 |
#endif
|
|
|
1190 |
|
|
|
1191 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1192 |
if (png_ptr->transformations & PNG_BACKGROUND)
|
|
|
1193 |
{
|
|
|
1194 |
info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
|
|
|
1195 |
info_ptr->num_trans = 0;
|
|
|
1196 |
info_ptr->background = png_ptr->background;
|
|
|
1197 |
}
|
|
|
1198 |
#endif
|
|
|
1199 |
|
|
|
1200 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
1201 |
if (png_ptr->transformations & PNG_GAMMA)
|
|
|
1202 |
{
|
|
|
1203 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1204 |
info_ptr->gamma = png_ptr->gamma;
|
|
|
1205 |
#endif
|
|
|
1206 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
1207 |
info_ptr->int_gamma = png_ptr->int_gamma;
|
|
|
1208 |
#endif
|
|
|
1209 |
}
|
|
|
1210 |
#endif
|
|
|
1211 |
|
|
|
1212 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
1213 |
if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
|
|
|
1214 |
info_ptr->bit_depth = 8;
|
|
|
1215 |
#endif
|
|
|
1216 |
|
|
|
1217 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
1218 |
if (png_ptr->transformations & PNG_GRAY_TO_RGB)
|
|
|
1219 |
info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
|
|
|
1220 |
#endif
|
|
|
1221 |
|
|
|
1222 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
1223 |
if (png_ptr->transformations & PNG_RGB_TO_GRAY)
|
|
|
1224 |
info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR;
|
|
|
1225 |
#endif
|
|
|
1226 |
|
|
|
1227 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
1228 |
if (png_ptr->transformations & PNG_DITHER)
|
|
|
1229 |
{
|
|
|
1230 |
if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
|
|
|
1231 |
(info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) &&
|
|
|
1232 |
png_ptr->palette_lookup && info_ptr->bit_depth == 8)
|
|
|
1233 |
{
|
|
|
1234 |
info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
|
|
|
1235 |
}
|
|
|
1236 |
}
|
|
|
1237 |
#endif
|
|
|
1238 |
|
|
|
1239 |
#if defined(PNG_READ_PACK_SUPPORTED)
|
|
|
1240 |
if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
|
|
|
1241 |
info_ptr->bit_depth = 8;
|
|
|
1242 |
#endif
|
|
|
1243 |
|
|
|
1244 |
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
1245 |
info_ptr->channels = 1;
|
|
|
1246 |
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
|
|
|
1247 |
info_ptr->channels = 3;
|
|
|
1248 |
else
|
|
|
1249 |
info_ptr->channels = 1;
|
|
|
1250 |
|
|
|
1251 |
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
|
1252 |
if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
|
|
|
1253 |
info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
|
|
|
1254 |
#endif
|
|
|
1255 |
|
|
|
1256 |
if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
|
|
|
1257 |
info_ptr->channels++;
|
|
|
1258 |
|
|
|
1259 |
#if defined(PNG_READ_FILLER_SUPPORTED)
|
|
|
1260 |
/* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */
|
|
|
1261 |
if ((png_ptr->transformations & PNG_FILLER) &&
|
|
|
1262 |
((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
|
|
|
1263 |
(info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
|
|
|
1264 |
{
|
|
|
1265 |
info_ptr->channels++;
|
|
|
1266 |
/* If adding a true alpha channel not just filler */
|
|
|
1267 |
#if !defined(PNG_1_0_X)
|
|
|
1268 |
if (png_ptr->transformations & PNG_ADD_ALPHA)
|
|
|
1269 |
info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
|
|
|
1270 |
#endif
|
|
|
1271 |
}
|
|
|
1272 |
#endif
|
|
|
1273 |
|
|
|
1274 |
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
|
|
|
1275 |
defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
|
|
|
1276 |
if (png_ptr->transformations & PNG_USER_TRANSFORM)
|
|
|
1277 |
{
|
|
|
1278 |
if (info_ptr->bit_depth < png_ptr->user_transform_depth)
|
|
|
1279 |
info_ptr->bit_depth = png_ptr->user_transform_depth;
|
|
|
1280 |
if (info_ptr->channels < png_ptr->user_transform_channels)
|
|
|
1281 |
info_ptr->channels = png_ptr->user_transform_channels;
|
|
|
1282 |
}
|
|
|
1283 |
#endif
|
|
|
1284 |
|
|
|
1285 |
info_ptr->pixel_depth = (png_byte)(info_ptr->channels *
|
|
|
1286 |
info_ptr->bit_depth);
|
|
|
1287 |
|
|
|
1288 |
info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width);
|
|
|
1289 |
|
|
|
1290 |
#if !defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
1291 |
if (png_ptr)
|
|
|
1292 |
return;
|
|
|
1293 |
#endif
|
|
|
1294 |
}
|
|
|
1295 |
|
|
|
1296 |
/* Transform the row. The order of transformations is significant,
|
|
|
1297 |
* and is very touchy. If you add a transformation, take care to
|
|
|
1298 |
* decide how it fits in with the other transformations here.
|
|
|
1299 |
*/
|
|
|
1300 |
void /* PRIVATE */
|
|
|
1301 |
png_do_read_transformations(png_structp png_ptr)
|
|
|
1302 |
{
|
|
|
1303 |
png_debug(1, "in png_do_read_transformations");
|
|
|
1304 |
if (png_ptr->row_buf == NULL)
|
|
|
1305 |
{
|
|
|
1306 |
#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
|
|
|
1307 |
char msg[50];
|
|
|
1308 |
|
|
|
1309 |
png_snprintf2(msg, 50,
|
|
|
1310 |
"NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number,
|
|
|
1311 |
png_ptr->pass);
|
|
|
1312 |
png_error(png_ptr, msg);
|
|
|
1313 |
#else
|
|
|
1314 |
png_error(png_ptr, "NULL row buffer");
|
|
|
1315 |
#endif
|
|
|
1316 |
}
|
|
|
1317 |
#ifdef PNG_WARN_UNINITIALIZED_ROW
|
|
|
1318 |
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
|
|
|
1319 |
/* Application has failed to call either png_read_start_image()
|
|
|
1320 |
* or png_read_update_info() after setting transforms that expand
|
|
|
1321 |
* pixels. This check added to libpng-1.2.19
|
|
|
1322 |
*/
|
|
|
1323 |
#if (PNG_WARN_UNINITIALIZED_ROW==1)
|
|
|
1324 |
png_error(png_ptr, "Uninitialized row");
|
|
|
1325 |
#else
|
|
|
1326 |
png_warning(png_ptr, "Uninitialized row");
|
|
|
1327 |
#endif
|
|
|
1328 |
#endif
|
|
|
1329 |
|
|
|
1330 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
1331 |
if (png_ptr->transformations & PNG_EXPAND)
|
|
|
1332 |
{
|
|
|
1333 |
if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
1334 |
{
|
|
|
1335 |
png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1336 |
png_ptr->palette, png_ptr->trans, png_ptr->num_trans);
|
|
|
1337 |
}
|
|
|
1338 |
else
|
|
|
1339 |
{
|
|
|
1340 |
if (png_ptr->num_trans &&
|
|
|
1341 |
(png_ptr->transformations & PNG_EXPAND_tRNS))
|
|
|
1342 |
png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1343 |
&(png_ptr->trans_values));
|
|
|
1344 |
else
|
|
|
1345 |
png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1346 |
NULL);
|
|
|
1347 |
}
|
|
|
1348 |
}
|
|
|
1349 |
#endif
|
|
|
1350 |
|
|
|
1351 |
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
|
1352 |
if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
|
|
|
1353 |
png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1354 |
PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA));
|
|
|
1355 |
#endif
|
|
|
1356 |
|
|
|
1357 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
1358 |
if (png_ptr->transformations & PNG_RGB_TO_GRAY)
|
|
|
1359 |
{
|
|
|
1360 |
int rgb_error =
|
|
|
1361 |
png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1362 |
if (rgb_error)
|
|
|
1363 |
{
|
|
|
1364 |
png_ptr->rgb_to_gray_status=1;
|
|
|
1365 |
if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
|
|
|
1366 |
PNG_RGB_TO_GRAY_WARN)
|
|
|
1367 |
png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
|
|
|
1368 |
if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
|
|
|
1369 |
PNG_RGB_TO_GRAY_ERR)
|
|
|
1370 |
png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
|
|
|
1371 |
}
|
|
|
1372 |
}
|
|
|
1373 |
#endif
|
|
|
1374 |
|
|
|
1375 |
/* From Andreas Dilger e-mail to png-implement, 26 March 1998:
|
|
|
1376 |
*
|
|
|
1377 |
* In most cases, the "simple transparency" should be done prior to doing
|
|
|
1378 |
* gray-to-RGB, or you will have to test 3x as many bytes to check if a
|
|
|
1379 |
* pixel is transparent. You would also need to make sure that the
|
|
|
1380 |
* transparency information is upgraded to RGB.
|
|
|
1381 |
*
|
|
|
1382 |
* To summarize, the current flow is:
|
|
|
1383 |
* - Gray + simple transparency -> compare 1 or 2 gray bytes and composite
|
|
|
1384 |
* with background "in place" if transparent,
|
|
|
1385 |
* convert to RGB if necessary
|
|
|
1386 |
* - Gray + alpha -> composite with gray background and remove alpha bytes,
|
|
|
1387 |
* convert to RGB if necessary
|
|
|
1388 |
*
|
|
|
1389 |
* To support RGB backgrounds for gray images we need:
|
|
|
1390 |
* - Gray + simple transparency -> convert to RGB + simple transparency,
|
|
|
1391 |
* compare 3 or 6 bytes and composite with
|
|
|
1392 |
* background "in place" if transparent
|
|
|
1393 |
* (3x compare/pixel compared to doing
|
|
|
1394 |
* composite with gray bkgrnd)
|
|
|
1395 |
* - Gray + alpha -> convert to RGB + alpha, composite with background and
|
|
|
1396 |
* remove alpha bytes (3x float
|
|
|
1397 |
* operations/pixel compared with composite
|
|
|
1398 |
* on gray background)
|
|
|
1399 |
*
|
|
|
1400 |
* Greg's change will do this. The reason it wasn't done before is for
|
|
|
1401 |
* performance, as this increases the per-pixel operations. If we would check
|
|
|
1402 |
* in advance if the background was gray or RGB, and position the gray-to-RGB
|
|
|
1403 |
* transform appropriately, then it would save a lot of work/time.
|
|
|
1404 |
*/
|
|
|
1405 |
|
|
|
1406 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
1407 |
/* If gray -> RGB, do so now only if background is non-gray; else do later
|
|
|
1408 |
* for performance reasons
|
|
|
1409 |
*/
|
|
|
1410 |
if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
|
|
|
1411 |
!(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
|
|
|
1412 |
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1413 |
#endif
|
|
|
1414 |
|
|
|
1415 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1416 |
if ((png_ptr->transformations & PNG_BACKGROUND) &&
|
|
|
1417 |
((png_ptr->num_trans != 0 ) ||
|
|
|
1418 |
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
|
|
|
1419 |
png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1420 |
&(png_ptr->trans_values), &(png_ptr->background)
|
|
|
1421 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
1422 |
, &(png_ptr->background_1),
|
|
|
1423 |
png_ptr->gamma_table, png_ptr->gamma_from_1,
|
|
|
1424 |
png_ptr->gamma_to_1, png_ptr->gamma_16_table,
|
|
|
1425 |
png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1,
|
|
|
1426 |
png_ptr->gamma_shift
|
|
|
1427 |
#endif
|
|
|
1428 |
);
|
|
|
1429 |
#endif
|
|
|
1430 |
|
|
|
1431 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
1432 |
if ((png_ptr->transformations & PNG_GAMMA) &&
|
|
|
1433 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1434 |
!((png_ptr->transformations & PNG_BACKGROUND) &&
|
|
|
1435 |
((png_ptr->num_trans != 0) ||
|
|
|
1436 |
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) &&
|
|
|
1437 |
#endif
|
|
|
1438 |
(png_ptr->color_type != PNG_COLOR_TYPE_PALETTE))
|
|
|
1439 |
png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1440 |
png_ptr->gamma_table, png_ptr->gamma_16_table,
|
|
|
1441 |
png_ptr->gamma_shift);
|
|
|
1442 |
#endif
|
|
|
1443 |
|
|
|
1444 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
1445 |
if (png_ptr->transformations & PNG_16_TO_8)
|
|
|
1446 |
png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1447 |
#endif
|
|
|
1448 |
|
|
|
1449 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
1450 |
if (png_ptr->transformations & PNG_DITHER)
|
|
|
1451 |
{
|
|
|
1452 |
png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1453 |
png_ptr->palette_lookup, png_ptr->dither_index);
|
|
|
1454 |
if (png_ptr->row_info.rowbytes == (png_uint_32)0)
|
|
|
1455 |
png_error(png_ptr, "png_do_dither returned rowbytes=0");
|
|
|
1456 |
}
|
|
|
1457 |
#endif
|
|
|
1458 |
|
|
|
1459 |
#if defined(PNG_READ_INVERT_SUPPORTED)
|
|
|
1460 |
if (png_ptr->transformations & PNG_INVERT_MONO)
|
|
|
1461 |
png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1462 |
#endif
|
|
|
1463 |
|
|
|
1464 |
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
|
1465 |
if (png_ptr->transformations & PNG_SHIFT)
|
|
|
1466 |
png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1467 |
&(png_ptr->shift));
|
|
|
1468 |
#endif
|
|
|
1469 |
|
|
|
1470 |
#if defined(PNG_READ_PACK_SUPPORTED)
|
|
|
1471 |
if (png_ptr->transformations & PNG_PACK)
|
|
|
1472 |
png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1473 |
#endif
|
|
|
1474 |
|
|
|
1475 |
#if defined(PNG_READ_BGR_SUPPORTED)
|
|
|
1476 |
if (png_ptr->transformations & PNG_BGR)
|
|
|
1477 |
png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1478 |
#endif
|
|
|
1479 |
|
|
|
1480 |
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
|
|
|
1481 |
if (png_ptr->transformations & PNG_PACKSWAP)
|
|
|
1482 |
png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1483 |
#endif
|
|
|
1484 |
|
|
|
1485 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
1486 |
/* If gray -> RGB, do so now only if we did not do so above */
|
|
|
1487 |
if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
|
|
|
1488 |
(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
|
|
|
1489 |
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1490 |
#endif
|
|
|
1491 |
|
|
|
1492 |
#if defined(PNG_READ_FILLER_SUPPORTED)
|
|
|
1493 |
if (png_ptr->transformations & PNG_FILLER)
|
|
|
1494 |
png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
|
|
|
1495 |
(png_uint_32)png_ptr->filler, png_ptr->flags);
|
|
|
1496 |
#endif
|
|
|
1497 |
|
|
|
1498 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
|
|
|
1499 |
if (png_ptr->transformations & PNG_INVERT_ALPHA)
|
|
|
1500 |
png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1501 |
#endif
|
|
|
1502 |
|
|
|
1503 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
|
|
|
1504 |
if (png_ptr->transformations & PNG_SWAP_ALPHA)
|
|
|
1505 |
png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1506 |
#endif
|
|
|
1507 |
|
|
|
1508 |
#if defined(PNG_READ_SWAP_SUPPORTED)
|
|
|
1509 |
if (png_ptr->transformations & PNG_SWAP_BYTES)
|
|
|
1510 |
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
|
|
|
1511 |
#endif
|
|
|
1512 |
|
|
|
1513 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
|
|
|
1514 |
if (png_ptr->transformations & PNG_USER_TRANSFORM)
|
|
|
1515 |
{
|
|
|
1516 |
if (png_ptr->read_user_transform_fn != NULL)
|
|
|
1517 |
(*(png_ptr->read_user_transform_fn)) /* User read transform function */
|
|
|
1518 |
(png_ptr, /* png_ptr */
|
|
|
1519 |
&(png_ptr->row_info), /* row_info: */
|
|
|
1520 |
/* png_uint_32 width; width of row */
|
|
|
1521 |
/* png_uint_32 rowbytes; number of bytes in row */
|
|
|
1522 |
/* png_byte color_type; color type of pixels */
|
|
|
1523 |
/* png_byte bit_depth; bit depth of samples */
|
|
|
1524 |
/* png_byte channels; number of channels (1-4) */
|
|
|
1525 |
/* png_byte pixel_depth; bits per pixel (depth*channels) */
|
|
|
1526 |
png_ptr->row_buf + 1); /* start of pixel data for row */
|
|
|
1527 |
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
|
|
1528 |
if (png_ptr->user_transform_depth)
|
|
|
1529 |
png_ptr->row_info.bit_depth = png_ptr->user_transform_depth;
|
|
|
1530 |
if (png_ptr->user_transform_channels)
|
|
|
1531 |
png_ptr->row_info.channels = png_ptr->user_transform_channels;
|
|
|
1532 |
#endif
|
|
|
1533 |
png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
|
|
|
1534 |
png_ptr->row_info.channels);
|
|
|
1535 |
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
|
|
|
1536 |
png_ptr->row_info.width);
|
|
|
1537 |
}
|
|
|
1538 |
#endif
|
|
|
1539 |
|
|
|
1540 |
}
|
|
|
1541 |
|
|
|
1542 |
#if defined(PNG_READ_PACK_SUPPORTED)
|
|
|
1543 |
/* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel,
|
|
|
1544 |
* without changing the actual values. Thus, if you had a row with
|
|
|
1545 |
* a bit depth of 1, you would end up with bytes that only contained
|
|
|
1546 |
* the numbers 0 or 1. If you would rather they contain 0 and 255, use
|
|
|
1547 |
* png_do_shift() after this.
|
|
|
1548 |
*/
|
|
|
1549 |
void /* PRIVATE */
|
|
|
1550 |
png_do_unpack(png_row_infop row_info, png_bytep row)
|
|
|
1551 |
{
|
|
|
1552 |
png_debug(1, "in png_do_unpack");
|
|
|
1553 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
1554 |
if (row != NULL && row_info != NULL && row_info->bit_depth < 8)
|
|
|
1555 |
#else
|
|
|
1556 |
if (row_info->bit_depth < 8)
|
|
|
1557 |
#endif
|
|
|
1558 |
{
|
|
|
1559 |
png_uint_32 i;
|
|
|
1560 |
png_uint_32 row_width=row_info->width;
|
|
|
1561 |
|
|
|
1562 |
switch (row_info->bit_depth)
|
|
|
1563 |
{
|
|
|
1564 |
case 1:
|
|
|
1565 |
{
|
|
|
1566 |
png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
|
|
|
1567 |
png_bytep dp = row + (png_size_t)row_width - 1;
|
|
|
1568 |
png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
|
|
|
1569 |
for (i = 0; i < row_width; i++)
|
|
|
1570 |
{
|
|
|
1571 |
*dp = (png_byte)((*sp >> shift) & 0x01);
|
|
|
1572 |
if (shift == 7)
|
|
|
1573 |
{
|
|
|
1574 |
shift = 0;
|
|
|
1575 |
sp--;
|
|
|
1576 |
}
|
|
|
1577 |
else
|
|
|
1578 |
shift++;
|
|
|
1579 |
|
|
|
1580 |
dp--;
|
|
|
1581 |
}
|
|
|
1582 |
break;
|
|
|
1583 |
}
|
|
|
1584 |
|
|
|
1585 |
case 2:
|
|
|
1586 |
{
|
|
|
1587 |
|
|
|
1588 |
png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
|
|
|
1589 |
png_bytep dp = row + (png_size_t)row_width - 1;
|
|
|
1590 |
png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
|
|
|
1591 |
for (i = 0; i < row_width; i++)
|
|
|
1592 |
{
|
|
|
1593 |
*dp = (png_byte)((*sp >> shift) & 0x03);
|
|
|
1594 |
if (shift == 6)
|
|
|
1595 |
{
|
|
|
1596 |
shift = 0;
|
|
|
1597 |
sp--;
|
|
|
1598 |
}
|
|
|
1599 |
else
|
|
|
1600 |
shift += 2;
|
|
|
1601 |
|
|
|
1602 |
dp--;
|
|
|
1603 |
}
|
|
|
1604 |
break;
|
|
|
1605 |
}
|
|
|
1606 |
|
|
|
1607 |
case 4:
|
|
|
1608 |
{
|
|
|
1609 |
png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
|
|
|
1610 |
png_bytep dp = row + (png_size_t)row_width - 1;
|
|
|
1611 |
png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
|
|
|
1612 |
for (i = 0; i < row_width; i++)
|
|
|
1613 |
{
|
|
|
1614 |
*dp = (png_byte)((*sp >> shift) & 0x0f);
|
|
|
1615 |
if (shift == 4)
|
|
|
1616 |
{
|
|
|
1617 |
shift = 0;
|
|
|
1618 |
sp--;
|
|
|
1619 |
}
|
|
|
1620 |
else
|
|
|
1621 |
shift = 4;
|
|
|
1622 |
|
|
|
1623 |
dp--;
|
|
|
1624 |
}
|
|
|
1625 |
break;
|
|
|
1626 |
}
|
|
|
1627 |
}
|
|
|
1628 |
row_info->bit_depth = 8;
|
|
|
1629 |
row_info->pixel_depth = (png_byte)(8 * row_info->channels);
|
|
|
1630 |
row_info->rowbytes = row_width * row_info->channels;
|
|
|
1631 |
}
|
|
|
1632 |
}
|
|
|
1633 |
#endif
|
|
|
1634 |
|
|
|
1635 |
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
|
1636 |
/* Reverse the effects of png_do_shift. This routine merely shifts the
|
|
|
1637 |
* pixels back to their significant bits values. Thus, if you have
|
|
|
1638 |
* a row of bit depth 8, but only 5 are significant, this will shift
|
|
|
1639 |
* the values back to 0 through 31.
|
|
|
1640 |
*/
|
|
|
1641 |
void /* PRIVATE */
|
|
|
1642 |
png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
|
|
|
1643 |
{
|
|
|
1644 |
png_debug(1, "in png_do_unshift");
|
|
|
1645 |
if (
|
|
|
1646 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
1647 |
row != NULL && row_info != NULL && sig_bits != NULL &&
|
|
|
1648 |
#endif
|
|
|
1649 |
row_info->color_type != PNG_COLOR_TYPE_PALETTE)
|
|
|
1650 |
{
|
|
|
1651 |
int shift[4];
|
|
|
1652 |
int channels = 0;
|
|
|
1653 |
int c;
|
|
|
1654 |
png_uint_16 value = 0;
|
|
|
1655 |
png_uint_32 row_width = row_info->width;
|
|
|
1656 |
|
|
|
1657 |
if (row_info->color_type & PNG_COLOR_MASK_COLOR)
|
|
|
1658 |
{
|
|
|
1659 |
shift[channels++] = row_info->bit_depth - sig_bits->red;
|
|
|
1660 |
shift[channels++] = row_info->bit_depth - sig_bits->green;
|
|
|
1661 |
shift[channels++] = row_info->bit_depth - sig_bits->blue;
|
|
|
1662 |
}
|
|
|
1663 |
else
|
|
|
1664 |
{
|
|
|
1665 |
shift[channels++] = row_info->bit_depth - sig_bits->gray;
|
|
|
1666 |
}
|
|
|
1667 |
if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
|
|
|
1668 |
{
|
|
|
1669 |
shift[channels++] = row_info->bit_depth - sig_bits->alpha;
|
|
|
1670 |
}
|
|
|
1671 |
|
|
|
1672 |
for (c = 0; c < channels; c++)
|
|
|
1673 |
{
|
|
|
1674 |
if (shift[c] <= 0)
|
|
|
1675 |
shift[c] = 0;
|
|
|
1676 |
else
|
|
|
1677 |
value = 1;
|
|
|
1678 |
}
|
|
|
1679 |
|
|
|
1680 |
if (!value)
|
|
|
1681 |
return;
|
|
|
1682 |
|
|
|
1683 |
switch (row_info->bit_depth)
|
|
|
1684 |
{
|
|
|
1685 |
case 2:
|
|
|
1686 |
{
|
|
|
1687 |
png_bytep bp;
|
|
|
1688 |
png_uint_32 i;
|
|
|
1689 |
png_uint_32 istop = row_info->rowbytes;
|
|
|
1690 |
|
|
|
1691 |
for (bp = row, i = 0; i < istop; i++)
|
|
|
1692 |
{
|
|
|
1693 |
*bp >>= 1;
|
|
|
1694 |
*bp++ &= 0x55;
|
|
|
1695 |
}
|
|
|
1696 |
break;
|
|
|
1697 |
}
|
|
|
1698 |
|
|
|
1699 |
case 4:
|
|
|
1700 |
{
|
|
|
1701 |
png_bytep bp = row;
|
|
|
1702 |
png_uint_32 i;
|
|
|
1703 |
png_uint_32 istop = row_info->rowbytes;
|
|
|
1704 |
png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) |
|
|
|
1705 |
(png_byte)((int)0xf >> shift[0]));
|
|
|
1706 |
|
|
|
1707 |
for (i = 0; i < istop; i++)
|
|
|
1708 |
{
|
|
|
1709 |
*bp >>= shift[0];
|
|
|
1710 |
*bp++ &= mask;
|
|
|
1711 |
}
|
|
|
1712 |
break;
|
|
|
1713 |
}
|
|
|
1714 |
|
|
|
1715 |
case 8:
|
|
|
1716 |
{
|
|
|
1717 |
png_bytep bp = row;
|
|
|
1718 |
png_uint_32 i;
|
|
|
1719 |
png_uint_32 istop = row_width * channels;
|
|
|
1720 |
|
|
|
1721 |
for (i = 0; i < istop; i++)
|
|
|
1722 |
{
|
|
|
1723 |
*bp++ >>= shift[i%channels];
|
|
|
1724 |
}
|
|
|
1725 |
break;
|
|
|
1726 |
}
|
|
|
1727 |
|
|
|
1728 |
case 16:
|
|
|
1729 |
{
|
|
|
1730 |
png_bytep bp = row;
|
|
|
1731 |
png_uint_32 i;
|
|
|
1732 |
png_uint_32 istop = channels * row_width;
|
|
|
1733 |
|
|
|
1734 |
for (i = 0; i < istop; i++)
|
|
|
1735 |
{
|
|
|
1736 |
value = (png_uint_16)((*bp << 8) + *(bp + 1));
|
|
|
1737 |
value >>= shift[i%channels];
|
|
|
1738 |
*bp++ = (png_byte)(value >> 8);
|
|
|
1739 |
*bp++ = (png_byte)(value & 0xff);
|
|
|
1740 |
}
|
|
|
1741 |
break;
|
|
|
1742 |
}
|
|
|
1743 |
}
|
|
|
1744 |
}
|
|
|
1745 |
}
|
|
|
1746 |
#endif
|
|
|
1747 |
|
|
|
1748 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
1749 |
/* Chop rows of bit depth 16 down to 8 */
|
|
|
1750 |
void /* PRIVATE */
|
|
|
1751 |
png_do_chop(png_row_infop row_info, png_bytep row)
|
|
|
1752 |
{
|
|
|
1753 |
png_debug(1, "in png_do_chop");
|
|
|
1754 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
1755 |
if (row != NULL && row_info != NULL && row_info->bit_depth == 16)
|
|
|
1756 |
#else
|
|
|
1757 |
if (row_info->bit_depth == 16)
|
|
|
1758 |
#endif
|
|
|
1759 |
{
|
|
|
1760 |
png_bytep sp = row;
|
|
|
1761 |
png_bytep dp = row;
|
|
|
1762 |
png_uint_32 i;
|
|
|
1763 |
png_uint_32 istop = row_info->width * row_info->channels;
|
|
|
1764 |
|
|
|
1765 |
for (i = 0; i<istop; i++, sp += 2, dp++)
|
|
|
1766 |
{
|
|
|
1767 |
#if defined(PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED)
|
|
|
1768 |
/* This does a more accurate scaling of the 16-bit color
|
|
|
1769 |
* value, rather than a simple low-byte truncation.
|
|
|
1770 |
*
|
|
|
1771 |
* What the ideal calculation should be:
|
|
|
1772 |
* *dp = (((((png_uint_32)(*sp) << 8) |
|
|
|
1773 |
* (png_uint_32)(*(sp + 1))) * 255 + 127)
|
|
|
1774 |
* / (png_uint_32)65535L;
|
|
|
1775 |
*
|
|
|
1776 |
* GRR: no, I think this is what it really should be:
|
|
|
1777 |
* *dp = (((((png_uint_32)(*sp) << 8) |
|
|
|
1778 |
* (png_uint_32)(*(sp + 1))) + 128L)
|
|
|
1779 |
* / (png_uint_32)257L;
|
|
|
1780 |
*
|
|
|
1781 |
* GRR: here's the exact calculation with shifts:
|
|
|
1782 |
* temp = (((png_uint_32)(*sp) << 8) |
|
|
|
1783 |
* (png_uint_32)(*(sp + 1))) + 128L;
|
|
|
1784 |
* *dp = (temp - (temp >> 8)) >> 8;
|
|
|
1785 |
*
|
|
|
1786 |
* Approximate calculation with shift/add instead of multiply/divide:
|
|
|
1787 |
* *dp = ((((png_uint_32)(*sp) << 8) |
|
|
|
1788 |
* (png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8;
|
|
|
1789 |
*
|
|
|
1790 |
* What we actually do to avoid extra shifting and conversion:
|
|
|
1791 |
*/
|
|
|
1792 |
|
|
|
1793 |
*dp = *sp + ((((int)(*(sp + 1)) - *sp) > 128) ? 1 : 0);
|
|
|
1794 |
#else
|
|
|
1795 |
/* Simply discard the low order byte */
|
|
|
1796 |
*dp = *sp;
|
|
|
1797 |
#endif
|
|
|
1798 |
}
|
|
|
1799 |
row_info->bit_depth = 8;
|
|
|
1800 |
row_info->pixel_depth = (png_byte)(8 * row_info->channels);
|
|
|
1801 |
row_info->rowbytes = row_info->width * row_info->channels;
|
|
|
1802 |
}
|
|
|
1803 |
}
|
|
|
1804 |
#endif
|
|
|
1805 |
|
|
|
1806 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
|
|
|
1807 |
void /* PRIVATE */
|
|
|
1808 |
png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
|
|
|
1809 |
{
|
|
|
1810 |
png_debug(1, "in png_do_read_swap_alpha");
|
|
|
1811 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
1812 |
if (row != NULL && row_info != NULL)
|
|
|
1813 |
#endif
|
|
|
1814 |
{
|
|
|
1815 |
png_uint_32 row_width = row_info->width;
|
|
|
1816 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
|
1817 |
{
|
|
|
1818 |
/* This converts from RGBA to ARGB */
|
|
|
1819 |
if (row_info->bit_depth == 8)
|
|
|
1820 |
{
|
|
|
1821 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1822 |
png_bytep dp = sp;
|
|
|
1823 |
png_byte save;
|
|
|
1824 |
png_uint_32 i;
|
|
|
1825 |
|
|
|
1826 |
for (i = 0; i < row_width; i++)
|
|
|
1827 |
{
|
|
|
1828 |
save = *(--sp);
|
|
|
1829 |
*(--dp) = *(--sp);
|
|
|
1830 |
*(--dp) = *(--sp);
|
|
|
1831 |
*(--dp) = *(--sp);
|
|
|
1832 |
*(--dp) = save;
|
|
|
1833 |
}
|
|
|
1834 |
}
|
|
|
1835 |
/* This converts from RRGGBBAA to AARRGGBB */
|
|
|
1836 |
else
|
|
|
1837 |
{
|
|
|
1838 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1839 |
png_bytep dp = sp;
|
|
|
1840 |
png_byte save[2];
|
|
|
1841 |
png_uint_32 i;
|
|
|
1842 |
|
|
|
1843 |
for (i = 0; i < row_width; i++)
|
|
|
1844 |
{
|
|
|
1845 |
save[0] = *(--sp);
|
|
|
1846 |
save[1] = *(--sp);
|
|
|
1847 |
*(--dp) = *(--sp);
|
|
|
1848 |
*(--dp) = *(--sp);
|
|
|
1849 |
*(--dp) = *(--sp);
|
|
|
1850 |
*(--dp) = *(--sp);
|
|
|
1851 |
*(--dp) = *(--sp);
|
|
|
1852 |
*(--dp) = *(--sp);
|
|
|
1853 |
*(--dp) = save[0];
|
|
|
1854 |
*(--dp) = save[1];
|
|
|
1855 |
}
|
|
|
1856 |
}
|
|
|
1857 |
}
|
|
|
1858 |
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
|
|
|
1859 |
{
|
|
|
1860 |
/* This converts from GA to AG */
|
|
|
1861 |
if (row_info->bit_depth == 8)
|
|
|
1862 |
{
|
|
|
1863 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1864 |
png_bytep dp = sp;
|
|
|
1865 |
png_byte save;
|
|
|
1866 |
png_uint_32 i;
|
|
|
1867 |
|
|
|
1868 |
for (i = 0; i < row_width; i++)
|
|
|
1869 |
{
|
|
|
1870 |
save = *(--sp);
|
|
|
1871 |
*(--dp) = *(--sp);
|
|
|
1872 |
*(--dp) = save;
|
|
|
1873 |
}
|
|
|
1874 |
}
|
|
|
1875 |
/* This converts from GGAA to AAGG */
|
|
|
1876 |
else
|
|
|
1877 |
{
|
|
|
1878 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1879 |
png_bytep dp = sp;
|
|
|
1880 |
png_byte save[2];
|
|
|
1881 |
png_uint_32 i;
|
|
|
1882 |
|
|
|
1883 |
for (i = 0; i < row_width; i++)
|
|
|
1884 |
{
|
|
|
1885 |
save[0] = *(--sp);
|
|
|
1886 |
save[1] = *(--sp);
|
|
|
1887 |
*(--dp) = *(--sp);
|
|
|
1888 |
*(--dp) = *(--sp);
|
|
|
1889 |
*(--dp) = save[0];
|
|
|
1890 |
*(--dp) = save[1];
|
|
|
1891 |
}
|
|
|
1892 |
}
|
|
|
1893 |
}
|
|
|
1894 |
}
|
|
|
1895 |
}
|
|
|
1896 |
#endif
|
|
|
1897 |
|
|
|
1898 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
|
|
|
1899 |
void /* PRIVATE */
|
|
|
1900 |
png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
|
|
|
1901 |
{
|
|
|
1902 |
png_debug(1, "in png_do_read_invert_alpha");
|
|
|
1903 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
1904 |
if (row != NULL && row_info != NULL)
|
|
|
1905 |
#endif
|
|
|
1906 |
{
|
|
|
1907 |
png_uint_32 row_width = row_info->width;
|
|
|
1908 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
|
1909 |
{
|
|
|
1910 |
/* This inverts the alpha channel in RGBA */
|
|
|
1911 |
if (row_info->bit_depth == 8)
|
|
|
1912 |
{
|
|
|
1913 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1914 |
png_bytep dp = sp;
|
|
|
1915 |
png_uint_32 i;
|
|
|
1916 |
|
|
|
1917 |
for (i = 0; i < row_width; i++)
|
|
|
1918 |
{
|
|
|
1919 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1920 |
|
|
|
1921 |
/* This does nothing:
|
|
|
1922 |
*(--dp) = *(--sp);
|
|
|
1923 |
*(--dp) = *(--sp);
|
|
|
1924 |
*(--dp) = *(--sp);
|
|
|
1925 |
We can replace it with:
|
|
|
1926 |
*/
|
|
|
1927 |
sp-=3;
|
|
|
1928 |
dp=sp;
|
|
|
1929 |
}
|
|
|
1930 |
}
|
|
|
1931 |
/* This inverts the alpha channel in RRGGBBAA */
|
|
|
1932 |
else
|
|
|
1933 |
{
|
|
|
1934 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1935 |
png_bytep dp = sp;
|
|
|
1936 |
png_uint_32 i;
|
|
|
1937 |
|
|
|
1938 |
for (i = 0; i < row_width; i++)
|
|
|
1939 |
{
|
|
|
1940 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1941 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1942 |
|
|
|
1943 |
/* This does nothing:
|
|
|
1944 |
*(--dp) = *(--sp);
|
|
|
1945 |
*(--dp) = *(--sp);
|
|
|
1946 |
*(--dp) = *(--sp);
|
|
|
1947 |
*(--dp) = *(--sp);
|
|
|
1948 |
*(--dp) = *(--sp);
|
|
|
1949 |
*(--dp) = *(--sp);
|
|
|
1950 |
We can replace it with:
|
|
|
1951 |
*/
|
|
|
1952 |
sp-=6;
|
|
|
1953 |
dp=sp;
|
|
|
1954 |
}
|
|
|
1955 |
}
|
|
|
1956 |
}
|
|
|
1957 |
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
|
|
|
1958 |
{
|
|
|
1959 |
/* This inverts the alpha channel in GA */
|
|
|
1960 |
if (row_info->bit_depth == 8)
|
|
|
1961 |
{
|
|
|
1962 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1963 |
png_bytep dp = sp;
|
|
|
1964 |
png_uint_32 i;
|
|
|
1965 |
|
|
|
1966 |
for (i = 0; i < row_width; i++)
|
|
|
1967 |
{
|
|
|
1968 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1969 |
*(--dp) = *(--sp);
|
|
|
1970 |
}
|
|
|
1971 |
}
|
|
|
1972 |
/* This inverts the alpha channel in GGAA */
|
|
|
1973 |
else
|
|
|
1974 |
{
|
|
|
1975 |
png_bytep sp = row + row_info->rowbytes;
|
|
|
1976 |
png_bytep dp = sp;
|
|
|
1977 |
png_uint_32 i;
|
|
|
1978 |
|
|
|
1979 |
for (i = 0; i < row_width; i++)
|
|
|
1980 |
{
|
|
|
1981 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1982 |
*(--dp) = (png_byte)(255 - *(--sp));
|
|
|
1983 |
/*
|
|
|
1984 |
*(--dp) = *(--sp);
|
|
|
1985 |
*(--dp) = *(--sp);
|
|
|
1986 |
*/
|
|
|
1987 |
sp-=2;
|
|
|
1988 |
dp=sp;
|
|
|
1989 |
}
|
|
|
1990 |
}
|
|
|
1991 |
}
|
|
|
1992 |
}
|
|
|
1993 |
}
|
|
|
1994 |
#endif
|
|
|
1995 |
|
|
|
1996 |
#if defined(PNG_READ_FILLER_SUPPORTED)
|
|
|
1997 |
/* Add filler channel if we have RGB color */
|
|
|
1998 |
void /* PRIVATE */
|
|
|
1999 |
png_do_read_filler(png_row_infop row_info, png_bytep row,
|
|
|
2000 |
png_uint_32 filler, png_uint_32 flags)
|
|
|
2001 |
{
|
|
|
2002 |
png_uint_32 i;
|
|
|
2003 |
png_uint_32 row_width = row_info->width;
|
|
|
2004 |
|
|
|
2005 |
png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
|
|
|
2006 |
png_byte lo_filler = (png_byte)(filler & 0xff);
|
|
|
2007 |
|
|
|
2008 |
png_debug(1, "in png_do_read_filler");
|
|
|
2009 |
if (
|
|
|
2010 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
2011 |
row != NULL && row_info != NULL &&
|
|
|
2012 |
#endif
|
|
|
2013 |
row_info->color_type == PNG_COLOR_TYPE_GRAY)
|
|
|
2014 |
{
|
|
|
2015 |
if (row_info->bit_depth == 8)
|
|
|
2016 |
{
|
|
|
2017 |
/* This changes the data from G to GX */
|
|
|
2018 |
if (flags & PNG_FLAG_FILLER_AFTER)
|
|
|
2019 |
{
|
|
|
2020 |
png_bytep sp = row + (png_size_t)row_width;
|
|
|
2021 |
png_bytep dp = sp + (png_size_t)row_width;
|
|
|
2022 |
for (i = 1; i < row_width; i++)
|
|
|
2023 |
{
|
|
|
2024 |
*(--dp) = lo_filler;
|
|
|
2025 |
*(--dp) = *(--sp);
|
|
|
2026 |
}
|
|
|
2027 |
*(--dp) = lo_filler;
|
|
|
2028 |
row_info->channels = 2;
|
|
|
2029 |
row_info->pixel_depth = 16;
|
|
|
2030 |
row_info->rowbytes = row_width * 2;
|
|
|
2031 |
}
|
|
|
2032 |
/* This changes the data from G to XG */
|
|
|
2033 |
else
|
|
|
2034 |
{
|
|
|
2035 |
png_bytep sp = row + (png_size_t)row_width;
|
|
|
2036 |
png_bytep dp = sp + (png_size_t)row_width;
|
|
|
2037 |
for (i = 0; i < row_width; i++)
|
|
|
2038 |
{
|
|
|
2039 |
*(--dp) = *(--sp);
|
|
|
2040 |
*(--dp) = lo_filler;
|
|
|
2041 |
}
|
|
|
2042 |
row_info->channels = 2;
|
|
|
2043 |
row_info->pixel_depth = 16;
|
|
|
2044 |
row_info->rowbytes = row_width * 2;
|
|
|
2045 |
}
|
|
|
2046 |
}
|
|
|
2047 |
else if (row_info->bit_depth == 16)
|
|
|
2048 |
{
|
|
|
2049 |
/* This changes the data from GG to GGXX */
|
|
|
2050 |
if (flags & PNG_FLAG_FILLER_AFTER)
|
|
|
2051 |
{
|
|
|
2052 |
png_bytep sp = row + (png_size_t)row_width * 2;
|
|
|
2053 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2054 |
for (i = 1; i < row_width; i++)
|
|
|
2055 |
{
|
|
|
2056 |
*(--dp) = hi_filler;
|
|
|
2057 |
*(--dp) = lo_filler;
|
|
|
2058 |
*(--dp) = *(--sp);
|
|
|
2059 |
*(--dp) = *(--sp);
|
|
|
2060 |
}
|
|
|
2061 |
*(--dp) = hi_filler;
|
|
|
2062 |
*(--dp) = lo_filler;
|
|
|
2063 |
row_info->channels = 2;
|
|
|
2064 |
row_info->pixel_depth = 32;
|
|
|
2065 |
row_info->rowbytes = row_width * 4;
|
|
|
2066 |
}
|
|
|
2067 |
/* This changes the data from GG to XXGG */
|
|
|
2068 |
else
|
|
|
2069 |
{
|
|
|
2070 |
png_bytep sp = row + (png_size_t)row_width * 2;
|
|
|
2071 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2072 |
for (i = 0; i < row_width; i++)
|
|
|
2073 |
{
|
|
|
2074 |
*(--dp) = *(--sp);
|
|
|
2075 |
*(--dp) = *(--sp);
|
|
|
2076 |
*(--dp) = hi_filler;
|
|
|
2077 |
*(--dp) = lo_filler;
|
|
|
2078 |
}
|
|
|
2079 |
row_info->channels = 2;
|
|
|
2080 |
row_info->pixel_depth = 32;
|
|
|
2081 |
row_info->rowbytes = row_width * 4;
|
|
|
2082 |
}
|
|
|
2083 |
}
|
|
|
2084 |
} /* COLOR_TYPE == GRAY */
|
|
|
2085 |
else if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
|
|
2086 |
{
|
|
|
2087 |
if (row_info->bit_depth == 8)
|
|
|
2088 |
{
|
|
|
2089 |
/* This changes the data from RGB to RGBX */
|
|
|
2090 |
if (flags & PNG_FLAG_FILLER_AFTER)
|
|
|
2091 |
{
|
|
|
2092 |
png_bytep sp = row + (png_size_t)row_width * 3;
|
|
|
2093 |
png_bytep dp = sp + (png_size_t)row_width;
|
|
|
2094 |
for (i = 1; i < row_width; i++)
|
|
|
2095 |
{
|
|
|
2096 |
*(--dp) = lo_filler;
|
|
|
2097 |
*(--dp) = *(--sp);
|
|
|
2098 |
*(--dp) = *(--sp);
|
|
|
2099 |
*(--dp) = *(--sp);
|
|
|
2100 |
}
|
|
|
2101 |
*(--dp) = lo_filler;
|
|
|
2102 |
row_info->channels = 4;
|
|
|
2103 |
row_info->pixel_depth = 32;
|
|
|
2104 |
row_info->rowbytes = row_width * 4;
|
|
|
2105 |
}
|
|
|
2106 |
/* This changes the data from RGB to XRGB */
|
|
|
2107 |
else
|
|
|
2108 |
{
|
|
|
2109 |
png_bytep sp = row + (png_size_t)row_width * 3;
|
|
|
2110 |
png_bytep dp = sp + (png_size_t)row_width;
|
|
|
2111 |
for (i = 0; i < row_width; i++)
|
|
|
2112 |
{
|
|
|
2113 |
*(--dp) = *(--sp);
|
|
|
2114 |
*(--dp) = *(--sp);
|
|
|
2115 |
*(--dp) = *(--sp);
|
|
|
2116 |
*(--dp) = lo_filler;
|
|
|
2117 |
}
|
|
|
2118 |
row_info->channels = 4;
|
|
|
2119 |
row_info->pixel_depth = 32;
|
|
|
2120 |
row_info->rowbytes = row_width * 4;
|
|
|
2121 |
}
|
|
|
2122 |
}
|
|
|
2123 |
else if (row_info->bit_depth == 16)
|
|
|
2124 |
{
|
|
|
2125 |
/* This changes the data from RRGGBB to RRGGBBXX */
|
|
|
2126 |
if (flags & PNG_FLAG_FILLER_AFTER)
|
|
|
2127 |
{
|
|
|
2128 |
png_bytep sp = row + (png_size_t)row_width * 6;
|
|
|
2129 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2130 |
for (i = 1; i < row_width; i++)
|
|
|
2131 |
{
|
|
|
2132 |
*(--dp) = hi_filler;
|
|
|
2133 |
*(--dp) = lo_filler;
|
|
|
2134 |
*(--dp) = *(--sp);
|
|
|
2135 |
*(--dp) = *(--sp);
|
|
|
2136 |
*(--dp) = *(--sp);
|
|
|
2137 |
*(--dp) = *(--sp);
|
|
|
2138 |
*(--dp) = *(--sp);
|
|
|
2139 |
*(--dp) = *(--sp);
|
|
|
2140 |
}
|
|
|
2141 |
*(--dp) = hi_filler;
|
|
|
2142 |
*(--dp) = lo_filler;
|
|
|
2143 |
row_info->channels = 4;
|
|
|
2144 |
row_info->pixel_depth = 64;
|
|
|
2145 |
row_info->rowbytes = row_width * 8;
|
|
|
2146 |
}
|
|
|
2147 |
/* This changes the data from RRGGBB to XXRRGGBB */
|
|
|
2148 |
else
|
|
|
2149 |
{
|
|
|
2150 |
png_bytep sp = row + (png_size_t)row_width * 6;
|
|
|
2151 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2152 |
for (i = 0; i < row_width; i++)
|
|
|
2153 |
{
|
|
|
2154 |
*(--dp) = *(--sp);
|
|
|
2155 |
*(--dp) = *(--sp);
|
|
|
2156 |
*(--dp) = *(--sp);
|
|
|
2157 |
*(--dp) = *(--sp);
|
|
|
2158 |
*(--dp) = *(--sp);
|
|
|
2159 |
*(--dp) = *(--sp);
|
|
|
2160 |
*(--dp) = hi_filler;
|
|
|
2161 |
*(--dp) = lo_filler;
|
|
|
2162 |
}
|
|
|
2163 |
row_info->channels = 4;
|
|
|
2164 |
row_info->pixel_depth = 64;
|
|
|
2165 |
row_info->rowbytes = row_width * 8;
|
|
|
2166 |
}
|
|
|
2167 |
}
|
|
|
2168 |
} /* COLOR_TYPE == RGB */
|
|
|
2169 |
}
|
|
|
2170 |
#endif
|
|
|
2171 |
|
|
|
2172 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
2173 |
/* Expand grayscale files to RGB, with or without alpha */
|
|
|
2174 |
void /* PRIVATE */
|
|
|
2175 |
png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
|
|
|
2176 |
{
|
|
|
2177 |
png_uint_32 i;
|
|
|
2178 |
png_uint_32 row_width = row_info->width;
|
|
|
2179 |
|
|
|
2180 |
png_debug(1, "in png_do_gray_to_rgb");
|
|
|
2181 |
if (row_info->bit_depth >= 8 &&
|
|
|
2182 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
2183 |
row != NULL && row_info != NULL &&
|
|
|
2184 |
#endif
|
|
|
2185 |
!(row_info->color_type & PNG_COLOR_MASK_COLOR))
|
|
|
2186 |
{
|
|
|
2187 |
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
|
|
|
2188 |
{
|
|
|
2189 |
if (row_info->bit_depth == 8)
|
|
|
2190 |
{
|
|
|
2191 |
png_bytep sp = row + (png_size_t)row_width - 1;
|
|
|
2192 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2193 |
for (i = 0; i < row_width; i++)
|
|
|
2194 |
{
|
|
|
2195 |
*(dp--) = *sp;
|
|
|
2196 |
*(dp--) = *sp;
|
|
|
2197 |
*(dp--) = *(sp--);
|
|
|
2198 |
}
|
|
|
2199 |
}
|
|
|
2200 |
else
|
|
|
2201 |
{
|
|
|
2202 |
png_bytep sp = row + (png_size_t)row_width * 2 - 1;
|
|
|
2203 |
png_bytep dp = sp + (png_size_t)row_width * 4;
|
|
|
2204 |
for (i = 0; i < row_width; i++)
|
|
|
2205 |
{
|
|
|
2206 |
*(dp--) = *sp;
|
|
|
2207 |
*(dp--) = *(sp - 1);
|
|
|
2208 |
*(dp--) = *sp;
|
|
|
2209 |
*(dp--) = *(sp - 1);
|
|
|
2210 |
*(dp--) = *(sp--);
|
|
|
2211 |
*(dp--) = *(sp--);
|
|
|
2212 |
}
|
|
|
2213 |
}
|
|
|
2214 |
}
|
|
|
2215 |
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
|
|
|
2216 |
{
|
|
|
2217 |
if (row_info->bit_depth == 8)
|
|
|
2218 |
{
|
|
|
2219 |
png_bytep sp = row + (png_size_t)row_width * 2 - 1;
|
|
|
2220 |
png_bytep dp = sp + (png_size_t)row_width * 2;
|
|
|
2221 |
for (i = 0; i < row_width; i++)
|
|
|
2222 |
{
|
|
|
2223 |
*(dp--) = *(sp--);
|
|
|
2224 |
*(dp--) = *sp;
|
|
|
2225 |
*(dp--) = *sp;
|
|
|
2226 |
*(dp--) = *(sp--);
|
|
|
2227 |
}
|
|
|
2228 |
}
|
|
|
2229 |
else
|
|
|
2230 |
{
|
|
|
2231 |
png_bytep sp = row + (png_size_t)row_width * 4 - 1;
|
|
|
2232 |
png_bytep dp = sp + (png_size_t)row_width * 4;
|
|
|
2233 |
for (i = 0; i < row_width; i++)
|
|
|
2234 |
{
|
|
|
2235 |
*(dp--) = *(sp--);
|
|
|
2236 |
*(dp--) = *(sp--);
|
|
|
2237 |
*(dp--) = *sp;
|
|
|
2238 |
*(dp--) = *(sp - 1);
|
|
|
2239 |
*(dp--) = *sp;
|
|
|
2240 |
*(dp--) = *(sp - 1);
|
|
|
2241 |
*(dp--) = *(sp--);
|
|
|
2242 |
*(dp--) = *(sp--);
|
|
|
2243 |
}
|
|
|
2244 |
}
|
|
|
2245 |
}
|
|
|
2246 |
row_info->channels += (png_byte)2;
|
|
|
2247 |
row_info->color_type |= PNG_COLOR_MASK_COLOR;
|
|
|
2248 |
row_info->pixel_depth = (png_byte)(row_info->channels *
|
|
|
2249 |
row_info->bit_depth);
|
|
|
2250 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
2251 |
}
|
|
|
2252 |
}
|
|
|
2253 |
#endif
|
|
|
2254 |
|
|
|
2255 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
2256 |
/* Reduce RGB files to grayscale, with or without alpha
|
|
|
2257 |
* using the equation given in Poynton's ColorFAQ at
|
|
|
2258 |
* <http://www.inforamp.net/~poynton/> (THIS LINK IS DEAD June 2008)
|
|
|
2259 |
* New link:
|
|
|
2260 |
* <http://www.poynton.com/notes/colour_and_gamma/>
|
|
|
2261 |
* Charles Poynton poynton at poynton.com
|
|
|
2262 |
*
|
|
|
2263 |
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
|
|
|
2264 |
*
|
|
|
2265 |
* We approximate this with
|
|
|
2266 |
*
|
|
|
2267 |
* Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
|
|
|
2268 |
*
|
|
|
2269 |
* which can be expressed with integers as
|
|
|
2270 |
*
|
|
|
2271 |
* Y = (6969 * R + 23434 * G + 2365 * B)/32768
|
|
|
2272 |
*
|
|
|
2273 |
* The calculation is to be done in a linear colorspace.
|
|
|
2274 |
*
|
|
|
2275 |
* Other integer coefficents can be used via png_set_rgb_to_gray().
|
|
|
2276 |
*/
|
|
|
2277 |
int /* PRIVATE */
|
|
|
2278 |
png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
|
|
|
2279 |
|
|
|
2280 |
{
|
|
|
2281 |
png_uint_32 i;
|
|
|
2282 |
|
|
|
2283 |
png_uint_32 row_width = row_info->width;
|
|
|
2284 |
int rgb_error = 0;
|
|
|
2285 |
|
|
|
2286 |
png_debug(1, "in png_do_rgb_to_gray");
|
|
|
2287 |
if (
|
|
|
2288 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
2289 |
row != NULL && row_info != NULL &&
|
|
|
2290 |
#endif
|
|
|
2291 |
(row_info->color_type & PNG_COLOR_MASK_COLOR))
|
|
|
2292 |
{
|
|
|
2293 |
png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
|
|
|
2294 |
png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
|
|
|
2295 |
png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;
|
|
|
2296 |
|
|
|
2297 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
|
|
2298 |
{
|
|
|
2299 |
if (row_info->bit_depth == 8)
|
|
|
2300 |
{
|
|
|
2301 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2302 |
if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
|
|
|
2303 |
{
|
|
|
2304 |
png_bytep sp = row;
|
|
|
2305 |
png_bytep dp = row;
|
|
|
2306 |
|
|
|
2307 |
for (i = 0; i < row_width; i++)
|
|
|
2308 |
{
|
|
|
2309 |
png_byte red = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2310 |
png_byte green = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2311 |
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2312 |
if (red != green || red != blue)
|
|
|
2313 |
{
|
|
|
2314 |
rgb_error |= 1;
|
|
|
2315 |
*(dp++) = png_ptr->gamma_from_1[
|
|
|
2316 |
(rc*red + gc*green + bc*blue)>>15];
|
|
|
2317 |
}
|
|
|
2318 |
else
|
|
|
2319 |
*(dp++) = *(sp - 1);
|
|
|
2320 |
}
|
|
|
2321 |
}
|
|
|
2322 |
else
|
|
|
2323 |
#endif
|
|
|
2324 |
{
|
|
|
2325 |
png_bytep sp = row;
|
|
|
2326 |
png_bytep dp = row;
|
|
|
2327 |
for (i = 0; i < row_width; i++)
|
|
|
2328 |
{
|
|
|
2329 |
png_byte red = *(sp++);
|
|
|
2330 |
png_byte green = *(sp++);
|
|
|
2331 |
png_byte blue = *(sp++);
|
|
|
2332 |
if (red != green || red != blue)
|
|
|
2333 |
{
|
|
|
2334 |
rgb_error |= 1;
|
|
|
2335 |
*(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
|
|
|
2336 |
}
|
|
|
2337 |
else
|
|
|
2338 |
*(dp++) = *(sp - 1);
|
|
|
2339 |
}
|
|
|
2340 |
}
|
|
|
2341 |
}
|
|
|
2342 |
|
|
|
2343 |
else /* RGB bit_depth == 16 */
|
|
|
2344 |
{
|
|
|
2345 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2346 |
if (png_ptr->gamma_16_to_1 != NULL &&
|
|
|
2347 |
png_ptr->gamma_16_from_1 != NULL)
|
|
|
2348 |
{
|
|
|
2349 |
png_bytep sp = row;
|
|
|
2350 |
png_bytep dp = row;
|
|
|
2351 |
for (i = 0; i < row_width; i++)
|
|
|
2352 |
{
|
|
|
2353 |
png_uint_16 red, green, blue, w;
|
|
|
2354 |
|
|
|
2355 |
red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2356 |
green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2357 |
blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2358 |
|
|
|
2359 |
if (red == green && red == blue)
|
|
|
2360 |
w = red;
|
|
|
2361 |
else
|
|
|
2362 |
{
|
|
|
2363 |
png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >>
|
|
|
2364 |
png_ptr->gamma_shift][red>>8];
|
|
|
2365 |
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
|
|
|
2366 |
png_ptr->gamma_shift][green>>8];
|
|
|
2367 |
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
|
|
|
2368 |
png_ptr->gamma_shift][blue>>8];
|
|
|
2369 |
png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1
|
|
|
2370 |
+ bc*blue_1)>>15);
|
|
|
2371 |
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
|
|
|
2372 |
png_ptr->gamma_shift][gray16 >> 8];
|
|
|
2373 |
rgb_error |= 1;
|
|
|
2374 |
}
|
|
|
2375 |
|
|
|
2376 |
*(dp++) = (png_byte)((w>>8) & 0xff);
|
|
|
2377 |
*(dp++) = (png_byte)(w & 0xff);
|
|
|
2378 |
}
|
|
|
2379 |
}
|
|
|
2380 |
else
|
|
|
2381 |
#endif
|
|
|
2382 |
{
|
|
|
2383 |
png_bytep sp = row;
|
|
|
2384 |
png_bytep dp = row;
|
|
|
2385 |
for (i = 0; i < row_width; i++)
|
|
|
2386 |
{
|
|
|
2387 |
png_uint_16 red, green, blue, gray16;
|
|
|
2388 |
|
|
|
2389 |
red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2390 |
green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2391 |
blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2392 |
|
|
|
2393 |
if (red != green || red != blue)
|
|
|
2394 |
rgb_error |= 1;
|
|
|
2395 |
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
|
|
|
2396 |
*(dp++) = (png_byte)((gray16>>8) & 0xff);
|
|
|
2397 |
*(dp++) = (png_byte)(gray16 & 0xff);
|
|
|
2398 |
}
|
|
|
2399 |
}
|
|
|
2400 |
}
|
|
|
2401 |
}
|
|
|
2402 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
|
2403 |
{
|
|
|
2404 |
if (row_info->bit_depth == 8)
|
|
|
2405 |
{
|
|
|
2406 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2407 |
if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
|
|
|
2408 |
{
|
|
|
2409 |
png_bytep sp = row;
|
|
|
2410 |
png_bytep dp = row;
|
|
|
2411 |
for (i = 0; i < row_width; i++)
|
|
|
2412 |
{
|
|
|
2413 |
png_byte red = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2414 |
png_byte green = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2415 |
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
|
|
|
2416 |
if (red != green || red != blue)
|
|
|
2417 |
rgb_error |= 1;
|
|
|
2418 |
*(dp++) = png_ptr->gamma_from_1
|
|
|
2419 |
[(rc*red + gc*green + bc*blue)>>15];
|
|
|
2420 |
*(dp++) = *(sp++); /* alpha */
|
|
|
2421 |
}
|
|
|
2422 |
}
|
|
|
2423 |
else
|
|
|
2424 |
#endif
|
|
|
2425 |
{
|
|
|
2426 |
png_bytep sp = row;
|
|
|
2427 |
png_bytep dp = row;
|
|
|
2428 |
for (i = 0; i < row_width; i++)
|
|
|
2429 |
{
|
|
|
2430 |
png_byte red = *(sp++);
|
|
|
2431 |
png_byte green = *(sp++);
|
|
|
2432 |
png_byte blue = *(sp++);
|
|
|
2433 |
if (red != green || red != blue)
|
|
|
2434 |
rgb_error |= 1;
|
|
|
2435 |
*(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
|
|
|
2436 |
*(dp++) = *(sp++); /* alpha */
|
|
|
2437 |
}
|
|
|
2438 |
}
|
|
|
2439 |
}
|
|
|
2440 |
else /* RGBA bit_depth == 16 */
|
|
|
2441 |
{
|
|
|
2442 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2443 |
if (png_ptr->gamma_16_to_1 != NULL &&
|
|
|
2444 |
png_ptr->gamma_16_from_1 != NULL)
|
|
|
2445 |
{
|
|
|
2446 |
png_bytep sp = row;
|
|
|
2447 |
png_bytep dp = row;
|
|
|
2448 |
for (i = 0; i < row_width; i++)
|
|
|
2449 |
{
|
|
|
2450 |
png_uint_16 red, green, blue, w;
|
|
|
2451 |
|
|
|
2452 |
red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2453 |
green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2454 |
blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
|
|
|
2455 |
|
|
|
2456 |
if (red == green && red == blue)
|
|
|
2457 |
w = red;
|
|
|
2458 |
else
|
|
|
2459 |
{
|
|
|
2460 |
png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >>
|
|
|
2461 |
png_ptr->gamma_shift][red>>8];
|
|
|
2462 |
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
|
|
|
2463 |
png_ptr->gamma_shift][green>>8];
|
|
|
2464 |
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
|
|
|
2465 |
png_ptr->gamma_shift][blue>>8];
|
|
|
2466 |
png_uint_16 gray16 = (png_uint_16)((rc * red_1
|
|
|
2467 |
+ gc * green_1 + bc * blue_1)>>15);
|
|
|
2468 |
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
|
|
|
2469 |
png_ptr->gamma_shift][gray16 >> 8];
|
|
|
2470 |
rgb_error |= 1;
|
|
|
2471 |
}
|
|
|
2472 |
|
|
|
2473 |
*(dp++) = (png_byte)((w>>8) & 0xff);
|
|
|
2474 |
*(dp++) = (png_byte)(w & 0xff);
|
|
|
2475 |
*(dp++) = *(sp++); /* alpha */
|
|
|
2476 |
*(dp++) = *(sp++);
|
|
|
2477 |
}
|
|
|
2478 |
}
|
|
|
2479 |
else
|
|
|
2480 |
#endif
|
|
|
2481 |
{
|
|
|
2482 |
png_bytep sp = row;
|
|
|
2483 |
png_bytep dp = row;
|
|
|
2484 |
for (i = 0; i < row_width; i++)
|
|
|
2485 |
{
|
|
|
2486 |
png_uint_16 red, green, blue, gray16;
|
|
|
2487 |
red = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
|
|
|
2488 |
green = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
|
|
|
2489 |
blue = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
|
|
|
2490 |
if (red != green || red != blue)
|
|
|
2491 |
rgb_error |= 1;
|
|
|
2492 |
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
|
|
|
2493 |
*(dp++) = (png_byte)((gray16>>8) & 0xff);
|
|
|
2494 |
*(dp++) = (png_byte)(gray16 & 0xff);
|
|
|
2495 |
*(dp++) = *(sp++); /* alpha */
|
|
|
2496 |
*(dp++) = *(sp++);
|
|
|
2497 |
}
|
|
|
2498 |
}
|
|
|
2499 |
}
|
|
|
2500 |
}
|
|
|
2501 |
row_info->channels -= (png_byte)2;
|
|
|
2502 |
row_info->color_type &= ~PNG_COLOR_MASK_COLOR;
|
|
|
2503 |
row_info->pixel_depth = (png_byte)(row_info->channels *
|
|
|
2504 |
row_info->bit_depth);
|
|
|
2505 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
2506 |
}
|
|
|
2507 |
return rgb_error;
|
|
|
2508 |
}
|
|
|
2509 |
#endif
|
|
|
2510 |
|
|
|
2511 |
/* Build a grayscale palette. Palette is assumed to be 1 << bit_depth
|
|
|
2512 |
* large of png_color. This lets grayscale images be treated as
|
|
|
2513 |
* paletted. Most useful for gamma correction and simplification
|
|
|
2514 |
* of code.
|
|
|
2515 |
*/
|
|
|
2516 |
void PNGAPI
|
|
|
2517 |
png_build_grayscale_palette(int bit_depth, png_colorp palette)
|
|
|
2518 |
{
|
|
|
2519 |
int num_palette;
|
|
|
2520 |
int color_inc;
|
|
|
2521 |
int i;
|
|
|
2522 |
int v;
|
|
|
2523 |
|
|
|
2524 |
png_debug(1, "in png_do_build_grayscale_palette");
|
|
|
2525 |
if (palette == NULL)
|
|
|
2526 |
return;
|
|
|
2527 |
|
|
|
2528 |
switch (bit_depth)
|
|
|
2529 |
{
|
|
|
2530 |
case 1:
|
|
|
2531 |
num_palette = 2;
|
|
|
2532 |
color_inc = 0xff;
|
|
|
2533 |
break;
|
|
|
2534 |
|
|
|
2535 |
case 2:
|
|
|
2536 |
num_palette = 4;
|
|
|
2537 |
color_inc = 0x55;
|
|
|
2538 |
break;
|
|
|
2539 |
|
|
|
2540 |
case 4:
|
|
|
2541 |
num_palette = 16;
|
|
|
2542 |
color_inc = 0x11;
|
|
|
2543 |
break;
|
|
|
2544 |
|
|
|
2545 |
case 8:
|
|
|
2546 |
num_palette = 256;
|
|
|
2547 |
color_inc = 1;
|
|
|
2548 |
break;
|
|
|
2549 |
|
|
|
2550 |
default:
|
|
|
2551 |
num_palette = 0;
|
|
|
2552 |
color_inc = 0;
|
|
|
2553 |
break;
|
|
|
2554 |
}
|
|
|
2555 |
|
|
|
2556 |
for (i = 0, v = 0; i < num_palette; i++, v += color_inc)
|
|
|
2557 |
{
|
|
|
2558 |
palette[i].red = (png_byte)v;
|
|
|
2559 |
palette[i].green = (png_byte)v;
|
|
|
2560 |
palette[i].blue = (png_byte)v;
|
|
|
2561 |
}
|
|
|
2562 |
}
|
|
|
2563 |
|
|
|
2564 |
/* This function is currently unused. Do we really need it? */
|
|
|
2565 |
#if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED)
|
|
|
2566 |
void /* PRIVATE */
|
|
|
2567 |
png_correct_palette(png_structp png_ptr, png_colorp palette,
|
|
|
2568 |
int num_palette)
|
|
|
2569 |
{
|
|
|
2570 |
png_debug(1, "in png_correct_palette");
|
|
|
2571 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
|
|
|
2572 |
defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
2573 |
if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
|
|
|
2574 |
{
|
|
|
2575 |
png_color back, back_1;
|
|
|
2576 |
|
|
|
2577 |
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
|
|
|
2578 |
{
|
|
|
2579 |
back.red = png_ptr->gamma_table[png_ptr->background.red];
|
|
|
2580 |
back.green = png_ptr->gamma_table[png_ptr->background.green];
|
|
|
2581 |
back.blue = png_ptr->gamma_table[png_ptr->background.blue];
|
|
|
2582 |
|
|
|
2583 |
back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
|
|
|
2584 |
back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
|
|
|
2585 |
back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
|
|
|
2586 |
}
|
|
|
2587 |
else
|
|
|
2588 |
{
|
|
|
2589 |
double g;
|
|
|
2590 |
|
|
|
2591 |
g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma);
|
|
|
2592 |
|
|
|
2593 |
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN ||
|
|
|
2594 |
fabs(g - 1.0) < PNG_GAMMA_THRESHOLD)
|
|
|
2595 |
{
|
|
|
2596 |
back.red = png_ptr->background.red;
|
|
|
2597 |
back.green = png_ptr->background.green;
|
|
|
2598 |
back.blue = png_ptr->background.blue;
|
|
|
2599 |
}
|
|
|
2600 |
else
|
|
|
2601 |
{
|
|
|
2602 |
back.red =
|
|
|
2603 |
(png_byte)(pow((double)png_ptr->background.red/255, g) *
|
|
|
2604 |
255.0 + 0.5);
|
|
|
2605 |
back.green =
|
|
|
2606 |
(png_byte)(pow((double)png_ptr->background.green/255, g) *
|
|
|
2607 |
255.0 + 0.5);
|
|
|
2608 |
back.blue =
|
|
|
2609 |
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
|
|
|
2610 |
255.0 + 0.5);
|
|
|
2611 |
}
|
|
|
2612 |
|
|
|
2613 |
g = 1.0 / png_ptr->background_gamma;
|
|
|
2614 |
|
|
|
2615 |
back_1.red =
|
|
|
2616 |
(png_byte)(pow((double)png_ptr->background.red/255, g) *
|
|
|
2617 |
255.0 + 0.5);
|
|
|
2618 |
back_1.green =
|
|
|
2619 |
(png_byte)(pow((double)png_ptr->background.green/255, g) *
|
|
|
2620 |
255.0 + 0.5);
|
|
|
2621 |
back_1.blue =
|
|
|
2622 |
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
|
|
|
2623 |
255.0 + 0.5);
|
|
|
2624 |
}
|
|
|
2625 |
|
|
|
2626 |
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
2627 |
{
|
|
|
2628 |
png_uint_32 i;
|
|
|
2629 |
|
|
|
2630 |
for (i = 0; i < (png_uint_32)num_palette; i++)
|
|
|
2631 |
{
|
|
|
2632 |
if (i < png_ptr->num_trans && png_ptr->trans[i] == 0)
|
|
|
2633 |
{
|
|
|
2634 |
palette[i] = back;
|
|
|
2635 |
}
|
|
|
2636 |
else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff)
|
|
|
2637 |
{
|
|
|
2638 |
png_byte v, w;
|
|
|
2639 |
|
|
|
2640 |
v = png_ptr->gamma_to_1[png_ptr->palette[i].red];
|
|
|
2641 |
png_composite(w, v, png_ptr->trans[i], back_1.red);
|
|
|
2642 |
palette[i].red = png_ptr->gamma_from_1[w];
|
|
|
2643 |
|
|
|
2644 |
v = png_ptr->gamma_to_1[png_ptr->palette[i].green];
|
|
|
2645 |
png_composite(w, v, png_ptr->trans[i], back_1.green);
|
|
|
2646 |
palette[i].green = png_ptr->gamma_from_1[w];
|
|
|
2647 |
|
|
|
2648 |
v = png_ptr->gamma_to_1[png_ptr->palette[i].blue];
|
|
|
2649 |
png_composite(w, v, png_ptr->trans[i], back_1.blue);
|
|
|
2650 |
palette[i].blue = png_ptr->gamma_from_1[w];
|
|
|
2651 |
}
|
|
|
2652 |
else
|
|
|
2653 |
{
|
|
|
2654 |
palette[i].red = png_ptr->gamma_table[palette[i].red];
|
|
|
2655 |
palette[i].green = png_ptr->gamma_table[palette[i].green];
|
|
|
2656 |
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
|
|
|
2657 |
}
|
|
|
2658 |
}
|
|
|
2659 |
}
|
|
|
2660 |
else
|
|
|
2661 |
{
|
|
|
2662 |
int i;
|
|
|
2663 |
|
|
|
2664 |
for (i = 0; i < num_palette; i++)
|
|
|
2665 |
{
|
|
|
2666 |
if (palette[i].red == (png_byte)png_ptr->trans_values.gray)
|
|
|
2667 |
{
|
|
|
2668 |
palette[i] = back;
|
|
|
2669 |
}
|
|
|
2670 |
else
|
|
|
2671 |
{
|
|
|
2672 |
palette[i].red = png_ptr->gamma_table[palette[i].red];
|
|
|
2673 |
palette[i].green = png_ptr->gamma_table[palette[i].green];
|
|
|
2674 |
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
|
|
|
2675 |
}
|
|
|
2676 |
}
|
|
|
2677 |
}
|
|
|
2678 |
}
|
|
|
2679 |
else
|
|
|
2680 |
#endif
|
|
|
2681 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2682 |
if (png_ptr->transformations & PNG_GAMMA)
|
|
|
2683 |
{
|
|
|
2684 |
int i;
|
|
|
2685 |
|
|
|
2686 |
for (i = 0; i < num_palette; i++)
|
|
|
2687 |
{
|
|
|
2688 |
palette[i].red = png_ptr->gamma_table[palette[i].red];
|
|
|
2689 |
palette[i].green = png_ptr->gamma_table[palette[i].green];
|
|
|
2690 |
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
|
|
|
2691 |
}
|
|
|
2692 |
}
|
|
|
2693 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2694 |
else
|
|
|
2695 |
#endif
|
|
|
2696 |
#endif
|
|
|
2697 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2698 |
if (png_ptr->transformations & PNG_BACKGROUND)
|
|
|
2699 |
{
|
|
|
2700 |
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
2701 |
{
|
|
|
2702 |
png_color back;
|
|
|
2703 |
|
|
|
2704 |
back.red = (png_byte)png_ptr->background.red;
|
|
|
2705 |
back.green = (png_byte)png_ptr->background.green;
|
|
|
2706 |
back.blue = (png_byte)png_ptr->background.blue;
|
|
|
2707 |
|
|
|
2708 |
for (i = 0; i < (int)png_ptr->num_trans; i++)
|
|
|
2709 |
{
|
|
|
2710 |
if (png_ptr->trans[i] == 0)
|
|
|
2711 |
{
|
|
|
2712 |
palette[i].red = back.red;
|
|
|
2713 |
palette[i].green = back.green;
|
|
|
2714 |
palette[i].blue = back.blue;
|
|
|
2715 |
}
|
|
|
2716 |
else if (png_ptr->trans[i] != 0xff)
|
|
|
2717 |
{
|
|
|
2718 |
png_composite(palette[i].red, png_ptr->palette[i].red,
|
|
|
2719 |
png_ptr->trans[i], back.red);
|
|
|
2720 |
png_composite(palette[i].green, png_ptr->palette[i].green,
|
|
|
2721 |
png_ptr->trans[i], back.green);
|
|
|
2722 |
png_composite(palette[i].blue, png_ptr->palette[i].blue,
|
|
|
2723 |
png_ptr->trans[i], back.blue);
|
|
|
2724 |
}
|
|
|
2725 |
}
|
|
|
2726 |
}
|
|
|
2727 |
else /* Assume grayscale palette (what else could it be?) */
|
|
|
2728 |
{
|
|
|
2729 |
int i;
|
|
|
2730 |
|
|
|
2731 |
for (i = 0; i < num_palette; i++)
|
|
|
2732 |
{
|
|
|
2733 |
if (i == (png_byte)png_ptr->trans_values.gray)
|
|
|
2734 |
{
|
|
|
2735 |
palette[i].red = (png_byte)png_ptr->background.red;
|
|
|
2736 |
palette[i].green = (png_byte)png_ptr->background.green;
|
|
|
2737 |
palette[i].blue = (png_byte)png_ptr->background.blue;
|
|
|
2738 |
}
|
|
|
2739 |
}
|
|
|
2740 |
}
|
|
|
2741 |
}
|
|
|
2742 |
#endif
|
|
|
2743 |
}
|
|
|
2744 |
#endif
|
|
|
2745 |
|
|
|
2746 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
2747 |
/* Replace any alpha or transparency with the supplied background color.
|
|
|
2748 |
* "background" is already in the screen gamma, while "background_1" is
|
|
|
2749 |
* at a gamma of 1.0. Paletted files have already been taken care of.
|
|
|
2750 |
*/
|
|
|
2751 |
void /* PRIVATE */
|
|
|
2752 |
png_do_background(png_row_infop row_info, png_bytep row,
|
|
|
2753 |
png_color_16p trans_values, png_color_16p background
|
|
|
2754 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2755 |
, png_color_16p background_1,
|
|
|
2756 |
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
|
|
|
2757 |
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
|
|
|
2758 |
png_uint_16pp gamma_16_to_1, int gamma_shift
|
|
|
2759 |
#endif
|
|
|
2760 |
)
|
|
|
2761 |
{
|
|
|
2762 |
png_bytep sp, dp;
|
|
|
2763 |
png_uint_32 i;
|
|
|
2764 |
png_uint_32 row_width=row_info->width;
|
|
|
2765 |
int shift;
|
|
|
2766 |
|
|
|
2767 |
png_debug(1, "in png_do_background");
|
|
|
2768 |
if (background != NULL &&
|
|
|
2769 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
2770 |
row != NULL && row_info != NULL &&
|
|
|
2771 |
#endif
|
|
|
2772 |
(!(row_info->color_type & PNG_COLOR_MASK_ALPHA) ||
|
|
|
2773 |
(row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_values)))
|
|
|
2774 |
{
|
|
|
2775 |
switch (row_info->color_type)
|
|
|
2776 |
{
|
|
|
2777 |
case PNG_COLOR_TYPE_GRAY:
|
|
|
2778 |
{
|
|
|
2779 |
switch (row_info->bit_depth)
|
|
|
2780 |
{
|
|
|
2781 |
case 1:
|
|
|
2782 |
{
|
|
|
2783 |
sp = row;
|
|
|
2784 |
shift = 7;
|
|
|
2785 |
for (i = 0; i < row_width; i++)
|
|
|
2786 |
{
|
|
|
2787 |
if ((png_uint_16)((*sp >> shift) & 0x01)
|
|
|
2788 |
== trans_values->gray)
|
|
|
2789 |
{
|
|
|
2790 |
*sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
|
|
|
2791 |
*sp |= (png_byte)(background->gray << shift);
|
|
|
2792 |
}
|
|
|
2793 |
if (!shift)
|
|
|
2794 |
{
|
|
|
2795 |
shift = 7;
|
|
|
2796 |
sp++;
|
|
|
2797 |
}
|
|
|
2798 |
else
|
|
|
2799 |
shift--;
|
|
|
2800 |
}
|
|
|
2801 |
break;
|
|
|
2802 |
}
|
|
|
2803 |
|
|
|
2804 |
case 2:
|
|
|
2805 |
{
|
|
|
2806 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2807 |
if (gamma_table != NULL)
|
|
|
2808 |
{
|
|
|
2809 |
sp = row;
|
|
|
2810 |
shift = 6;
|
|
|
2811 |
for (i = 0; i < row_width; i++)
|
|
|
2812 |
{
|
|
|
2813 |
if ((png_uint_16)((*sp >> shift) & 0x03)
|
|
|
2814 |
== trans_values->gray)
|
|
|
2815 |
{
|
|
|
2816 |
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
|
|
|
2817 |
*sp |= (png_byte)(background->gray << shift);
|
|
|
2818 |
}
|
|
|
2819 |
else
|
|
|
2820 |
{
|
|
|
2821 |
png_byte p = (png_byte)((*sp >> shift) & 0x03);
|
|
|
2822 |
png_byte g = (png_byte)((gamma_table [p | (p << 2) |
|
|
|
2823 |
(p << 4) | (p << 6)] >> 6) & 0x03);
|
|
|
2824 |
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
|
|
|
2825 |
*sp |= (png_byte)(g << shift);
|
|
|
2826 |
}
|
|
|
2827 |
if (!shift)
|
|
|
2828 |
{
|
|
|
2829 |
shift = 6;
|
|
|
2830 |
sp++;
|
|
|
2831 |
}
|
|
|
2832 |
else
|
|
|
2833 |
shift -= 2;
|
|
|
2834 |
}
|
|
|
2835 |
}
|
|
|
2836 |
else
|
|
|
2837 |
#endif
|
|
|
2838 |
{
|
|
|
2839 |
sp = row;
|
|
|
2840 |
shift = 6;
|
|
|
2841 |
for (i = 0; i < row_width; i++)
|
|
|
2842 |
{
|
|
|
2843 |
if ((png_uint_16)((*sp >> shift) & 0x03)
|
|
|
2844 |
== trans_values->gray)
|
|
|
2845 |
{
|
|
|
2846 |
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
|
|
|
2847 |
*sp |= (png_byte)(background->gray << shift);
|
|
|
2848 |
}
|
|
|
2849 |
if (!shift)
|
|
|
2850 |
{
|
|
|
2851 |
shift = 6;
|
|
|
2852 |
sp++;
|
|
|
2853 |
}
|
|
|
2854 |
else
|
|
|
2855 |
shift -= 2;
|
|
|
2856 |
}
|
|
|
2857 |
}
|
|
|
2858 |
break;
|
|
|
2859 |
}
|
|
|
2860 |
|
|
|
2861 |
case 4:
|
|
|
2862 |
{
|
|
|
2863 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2864 |
if (gamma_table != NULL)
|
|
|
2865 |
{
|
|
|
2866 |
sp = row;
|
|
|
2867 |
shift = 4;
|
|
|
2868 |
for (i = 0; i < row_width; i++)
|
|
|
2869 |
{
|
|
|
2870 |
if ((png_uint_16)((*sp >> shift) & 0x0f)
|
|
|
2871 |
== trans_values->gray)
|
|
|
2872 |
{
|
|
|
2873 |
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
|
|
|
2874 |
*sp |= (png_byte)(background->gray << shift);
|
|
|
2875 |
}
|
|
|
2876 |
else
|
|
|
2877 |
{
|
|
|
2878 |
png_byte p = (png_byte)((*sp >> shift) & 0x0f);
|
|
|
2879 |
png_byte g = (png_byte)((gamma_table[p |
|
|
|
2880 |
(p << 4)] >> 4) & 0x0f);
|
|
|
2881 |
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
|
|
|
2882 |
*sp |= (png_byte)(g << shift);
|
|
|
2883 |
}
|
|
|
2884 |
if (!shift)
|
|
|
2885 |
{
|
|
|
2886 |
shift = 4;
|
|
|
2887 |
sp++;
|
|
|
2888 |
}
|
|
|
2889 |
else
|
|
|
2890 |
shift -= 4;
|
|
|
2891 |
}
|
|
|
2892 |
}
|
|
|
2893 |
else
|
|
|
2894 |
#endif
|
|
|
2895 |
{
|
|
|
2896 |
sp = row;
|
|
|
2897 |
shift = 4;
|
|
|
2898 |
for (i = 0; i < row_width; i++)
|
|
|
2899 |
{
|
|
|
2900 |
if ((png_uint_16)((*sp >> shift) & 0x0f)
|
|
|
2901 |
== trans_values->gray)
|
|
|
2902 |
{
|
|
|
2903 |
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
|
|
|
2904 |
*sp |= (png_byte)(background->gray << shift);
|
|
|
2905 |
}
|
|
|
2906 |
if (!shift)
|
|
|
2907 |
{
|
|
|
2908 |
shift = 4;
|
|
|
2909 |
sp++;
|
|
|
2910 |
}
|
|
|
2911 |
else
|
|
|
2912 |
shift -= 4;
|
|
|
2913 |
}
|
|
|
2914 |
}
|
|
|
2915 |
break;
|
|
|
2916 |
}
|
|
|
2917 |
|
|
|
2918 |
case 8:
|
|
|
2919 |
{
|
|
|
2920 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2921 |
if (gamma_table != NULL)
|
|
|
2922 |
{
|
|
|
2923 |
sp = row;
|
|
|
2924 |
for (i = 0; i < row_width; i++, sp++)
|
|
|
2925 |
{
|
|
|
2926 |
if (*sp == trans_values->gray)
|
|
|
2927 |
{
|
|
|
2928 |
*sp = (png_byte)background->gray;
|
|
|
2929 |
}
|
|
|
2930 |
else
|
|
|
2931 |
{
|
|
|
2932 |
*sp = gamma_table[*sp];
|
|
|
2933 |
}
|
|
|
2934 |
}
|
|
|
2935 |
}
|
|
|
2936 |
else
|
|
|
2937 |
#endif
|
|
|
2938 |
{
|
|
|
2939 |
sp = row;
|
|
|
2940 |
for (i = 0; i < row_width; i++, sp++)
|
|
|
2941 |
{
|
|
|
2942 |
if (*sp == trans_values->gray)
|
|
|
2943 |
{
|
|
|
2944 |
*sp = (png_byte)background->gray;
|
|
|
2945 |
}
|
|
|
2946 |
}
|
|
|
2947 |
}
|
|
|
2948 |
break;
|
|
|
2949 |
}
|
|
|
2950 |
|
|
|
2951 |
case 16:
|
|
|
2952 |
{
|
|
|
2953 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
2954 |
if (gamma_16 != NULL)
|
|
|
2955 |
{
|
|
|
2956 |
sp = row;
|
|
|
2957 |
for (i = 0; i < row_width; i++, sp += 2)
|
|
|
2958 |
{
|
|
|
2959 |
png_uint_16 v;
|
|
|
2960 |
|
|
|
2961 |
v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
|
|
|
2962 |
if (v == trans_values->gray)
|
|
|
2963 |
{
|
|
|
2964 |
/* Background is already in screen gamma */
|
|
|
2965 |
*sp = (png_byte)((background->gray >> 8) & 0xff);
|
|
|
2966 |
*(sp + 1) = (png_byte)(background->gray & 0xff);
|
|
|
2967 |
}
|
|
|
2968 |
else
|
|
|
2969 |
{
|
|
|
2970 |
v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
|
|
|
2971 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
2972 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
2973 |
}
|
|
|
2974 |
}
|
|
|
2975 |
}
|
|
|
2976 |
else
|
|
|
2977 |
#endif
|
|
|
2978 |
{
|
|
|
2979 |
sp = row;
|
|
|
2980 |
for (i = 0; i < row_width; i++, sp += 2)
|
|
|
2981 |
{
|
|
|
2982 |
png_uint_16 v;
|
|
|
2983 |
|
|
|
2984 |
v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
|
|
|
2985 |
if (v == trans_values->gray)
|
|
|
2986 |
{
|
|
|
2987 |
*sp = (png_byte)((background->gray >> 8) & 0xff);
|
|
|
2988 |
*(sp + 1) = (png_byte)(background->gray & 0xff);
|
|
|
2989 |
}
|
|
|
2990 |
}
|
|
|
2991 |
}
|
|
|
2992 |
break;
|
|
|
2993 |
}
|
|
|
2994 |
}
|
|
|
2995 |
break;
|
|
|
2996 |
}
|
|
|
2997 |
|
|
|
2998 |
case PNG_COLOR_TYPE_RGB:
|
|
|
2999 |
{
|
|
|
3000 |
if (row_info->bit_depth == 8)
|
|
|
3001 |
{
|
|
|
3002 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3003 |
if (gamma_table != NULL)
|
|
|
3004 |
{
|
|
|
3005 |
sp = row;
|
|
|
3006 |
for (i = 0; i < row_width; i++, sp += 3)
|
|
|
3007 |
{
|
|
|
3008 |
if (*sp == trans_values->red &&
|
|
|
3009 |
*(sp + 1) == trans_values->green &&
|
|
|
3010 |
*(sp + 2) == trans_values->blue)
|
|
|
3011 |
{
|
|
|
3012 |
*sp = (png_byte)background->red;
|
|
|
3013 |
*(sp + 1) = (png_byte)background->green;
|
|
|
3014 |
*(sp + 2) = (png_byte)background->blue;
|
|
|
3015 |
}
|
|
|
3016 |
else
|
|
|
3017 |
{
|
|
|
3018 |
*sp = gamma_table[*sp];
|
|
|
3019 |
*(sp + 1) = gamma_table[*(sp + 1)];
|
|
|
3020 |
*(sp + 2) = gamma_table[*(sp + 2)];
|
|
|
3021 |
}
|
|
|
3022 |
}
|
|
|
3023 |
}
|
|
|
3024 |
else
|
|
|
3025 |
#endif
|
|
|
3026 |
{
|
|
|
3027 |
sp = row;
|
|
|
3028 |
for (i = 0; i < row_width; i++, sp += 3)
|
|
|
3029 |
{
|
|
|
3030 |
if (*sp == trans_values->red &&
|
|
|
3031 |
*(sp + 1) == trans_values->green &&
|
|
|
3032 |
*(sp + 2) == trans_values->blue)
|
|
|
3033 |
{
|
|
|
3034 |
*sp = (png_byte)background->red;
|
|
|
3035 |
*(sp + 1) = (png_byte)background->green;
|
|
|
3036 |
*(sp + 2) = (png_byte)background->blue;
|
|
|
3037 |
}
|
|
|
3038 |
}
|
|
|
3039 |
}
|
|
|
3040 |
}
|
|
|
3041 |
else /* if (row_info->bit_depth == 16) */
|
|
|
3042 |
{
|
|
|
3043 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3044 |
if (gamma_16 != NULL)
|
|
|
3045 |
{
|
|
|
3046 |
sp = row;
|
|
|
3047 |
for (i = 0; i < row_width; i++, sp += 6)
|
|
|
3048 |
{
|
|
|
3049 |
png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
|
|
|
3050 |
png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
|
|
|
3051 |
png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
|
|
|
3052 |
if (r == trans_values->red && g == trans_values->green &&
|
|
|
3053 |
b == trans_values->blue)
|
|
|
3054 |
{
|
|
|
3055 |
/* Background is already in screen gamma */
|
|
|
3056 |
*sp = (png_byte)((background->red >> 8) & 0xff);
|
|
|
3057 |
*(sp + 1) = (png_byte)(background->red & 0xff);
|
|
|
3058 |
*(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
|
|
|
3059 |
*(sp + 3) = (png_byte)(background->green & 0xff);
|
|
|
3060 |
*(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
|
|
|
3061 |
*(sp + 5) = (png_byte)(background->blue & 0xff);
|
|
|
3062 |
}
|
|
|
3063 |
else
|
|
|
3064 |
{
|
|
|
3065 |
png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3066 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3067 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3068 |
v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
|
|
|
3069 |
*(sp + 2) = (png_byte)((v >> 8) & 0xff);
|
|
|
3070 |
*(sp + 3) = (png_byte)(v & 0xff);
|
|
|
3071 |
v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
|
|
|
3072 |
*(sp + 4) = (png_byte)((v >> 8) & 0xff);
|
|
|
3073 |
*(sp + 5) = (png_byte)(v & 0xff);
|
|
|
3074 |
}
|
|
|
3075 |
}
|
|
|
3076 |
}
|
|
|
3077 |
else
|
|
|
3078 |
#endif
|
|
|
3079 |
{
|
|
|
3080 |
sp = row;
|
|
|
3081 |
for (i = 0; i < row_width; i++, sp += 6)
|
|
|
3082 |
{
|
|
|
3083 |
png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp+1));
|
|
|
3084 |
png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
|
|
|
3085 |
png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
|
|
|
3086 |
|
|
|
3087 |
if (r == trans_values->red && g == trans_values->green &&
|
|
|
3088 |
b == trans_values->blue)
|
|
|
3089 |
{
|
|
|
3090 |
*sp = (png_byte)((background->red >> 8) & 0xff);
|
|
|
3091 |
*(sp + 1) = (png_byte)(background->red & 0xff);
|
|
|
3092 |
*(sp + 2) = (png_byte)((background->green >> 8) & 0xff);
|
|
|
3093 |
*(sp + 3) = (png_byte)(background->green & 0xff);
|
|
|
3094 |
*(sp + 4) = (png_byte)((background->blue >> 8) & 0xff);
|
|
|
3095 |
*(sp + 5) = (png_byte)(background->blue & 0xff);
|
|
|
3096 |
}
|
|
|
3097 |
}
|
|
|
3098 |
}
|
|
|
3099 |
}
|
|
|
3100 |
break;
|
|
|
3101 |
}
|
|
|
3102 |
|
|
|
3103 |
case PNG_COLOR_TYPE_GRAY_ALPHA:
|
|
|
3104 |
{
|
|
|
3105 |
if (row_info->bit_depth == 8)
|
|
|
3106 |
{
|
|
|
3107 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3108 |
if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
|
|
|
3109 |
gamma_table != NULL)
|
|
|
3110 |
{
|
|
|
3111 |
sp = row;
|
|
|
3112 |
dp = row;
|
|
|
3113 |
for (i = 0; i < row_width; i++, sp += 2, dp++)
|
|
|
3114 |
{
|
|
|
3115 |
png_uint_16 a = *(sp + 1);
|
|
|
3116 |
|
|
|
3117 |
if (a == 0xff)
|
|
|
3118 |
{
|
|
|
3119 |
*dp = gamma_table[*sp];
|
|
|
3120 |
}
|
|
|
3121 |
else if (a == 0)
|
|
|
3122 |
{
|
|
|
3123 |
/* Background is already in screen gamma */
|
|
|
3124 |
*dp = (png_byte)background->gray;
|
|
|
3125 |
}
|
|
|
3126 |
else
|
|
|
3127 |
{
|
|
|
3128 |
png_byte v, w;
|
|
|
3129 |
|
|
|
3130 |
v = gamma_to_1[*sp];
|
|
|
3131 |
png_composite(w, v, a, background_1->gray);
|
|
|
3132 |
*dp = gamma_from_1[w];
|
|
|
3133 |
}
|
|
|
3134 |
}
|
|
|
3135 |
}
|
|
|
3136 |
else
|
|
|
3137 |
#endif
|
|
|
3138 |
{
|
|
|
3139 |
sp = row;
|
|
|
3140 |
dp = row;
|
|
|
3141 |
for (i = 0; i < row_width; i++, sp += 2, dp++)
|
|
|
3142 |
{
|
|
|
3143 |
png_byte a = *(sp + 1);
|
|
|
3144 |
|
|
|
3145 |
if (a == 0xff)
|
|
|
3146 |
{
|
|
|
3147 |
*dp = *sp;
|
|
|
3148 |
}
|
|
|
3149 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3150 |
else if (a == 0)
|
|
|
3151 |
{
|
|
|
3152 |
*dp = (png_byte)background->gray;
|
|
|
3153 |
}
|
|
|
3154 |
else
|
|
|
3155 |
{
|
|
|
3156 |
png_composite(*dp, *sp, a, background_1->gray);
|
|
|
3157 |
}
|
|
|
3158 |
#else
|
|
|
3159 |
*dp = (png_byte)background->gray;
|
|
|
3160 |
#endif
|
|
|
3161 |
}
|
|
|
3162 |
}
|
|
|
3163 |
}
|
|
|
3164 |
else /* if (png_ptr->bit_depth == 16) */
|
|
|
3165 |
{
|
|
|
3166 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3167 |
if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
|
|
|
3168 |
gamma_16_to_1 != NULL)
|
|
|
3169 |
{
|
|
|
3170 |
sp = row;
|
|
|
3171 |
dp = row;
|
|
|
3172 |
for (i = 0; i < row_width; i++, sp += 4, dp += 2)
|
|
|
3173 |
{
|
|
|
3174 |
png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
|
|
|
3175 |
|
|
|
3176 |
if (a == (png_uint_16)0xffff)
|
|
|
3177 |
{
|
|
|
3178 |
png_uint_16 v;
|
|
|
3179 |
|
|
|
3180 |
v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3181 |
*dp = (png_byte)((v >> 8) & 0xff);
|
|
|
3182 |
*(dp + 1) = (png_byte)(v & 0xff);
|
|
|
3183 |
}
|
|
|
3184 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3185 |
else if (a == 0)
|
|
|
3186 |
#else
|
|
|
3187 |
else
|
|
|
3188 |
#endif
|
|
|
3189 |
{
|
|
|
3190 |
/* Background is already in screen gamma */
|
|
|
3191 |
*dp = (png_byte)((background->gray >> 8) & 0xff);
|
|
|
3192 |
*(dp + 1) = (png_byte)(background->gray & 0xff);
|
|
|
3193 |
}
|
|
|
3194 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3195 |
else
|
|
|
3196 |
{
|
|
|
3197 |
png_uint_16 g, v, w;
|
|
|
3198 |
|
|
|
3199 |
g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3200 |
png_composite_16(v, g, a, background_1->gray);
|
|
|
3201 |
w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8];
|
|
|
3202 |
*dp = (png_byte)((w >> 8) & 0xff);
|
|
|
3203 |
*(dp + 1) = (png_byte)(w & 0xff);
|
|
|
3204 |
}
|
|
|
3205 |
#endif
|
|
|
3206 |
}
|
|
|
3207 |
}
|
|
|
3208 |
else
|
|
|
3209 |
#endif
|
|
|
3210 |
{
|
|
|
3211 |
sp = row;
|
|
|
3212 |
dp = row;
|
|
|
3213 |
for (i = 0; i < row_width; i++, sp += 4, dp += 2)
|
|
|
3214 |
{
|
|
|
3215 |
png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
|
|
|
3216 |
if (a == (png_uint_16)0xffff)
|
|
|
3217 |
{
|
|
|
3218 |
png_memcpy(dp, sp, 2);
|
|
|
3219 |
}
|
|
|
3220 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3221 |
else if (a == 0)
|
|
|
3222 |
#else
|
|
|
3223 |
else
|
|
|
3224 |
#endif
|
|
|
3225 |
{
|
|
|
3226 |
*dp = (png_byte)((background->gray >> 8) & 0xff);
|
|
|
3227 |
*(dp + 1) = (png_byte)(background->gray & 0xff);
|
|
|
3228 |
}
|
|
|
3229 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3230 |
else
|
|
|
3231 |
{
|
|
|
3232 |
png_uint_16 g, v;
|
|
|
3233 |
|
|
|
3234 |
g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
|
|
|
3235 |
png_composite_16(v, g, a, background_1->gray);
|
|
|
3236 |
*dp = (png_byte)((v >> 8) & 0xff);
|
|
|
3237 |
*(dp + 1) = (png_byte)(v & 0xff);
|
|
|
3238 |
}
|
|
|
3239 |
#endif
|
|
|
3240 |
}
|
|
|
3241 |
}
|
|
|
3242 |
}
|
|
|
3243 |
break;
|
|
|
3244 |
}
|
|
|
3245 |
|
|
|
3246 |
case PNG_COLOR_TYPE_RGB_ALPHA:
|
|
|
3247 |
{
|
|
|
3248 |
if (row_info->bit_depth == 8)
|
|
|
3249 |
{
|
|
|
3250 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3251 |
if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
|
|
|
3252 |
gamma_table != NULL)
|
|
|
3253 |
{
|
|
|
3254 |
sp = row;
|
|
|
3255 |
dp = row;
|
|
|
3256 |
for (i = 0; i < row_width; i++, sp += 4, dp += 3)
|
|
|
3257 |
{
|
|
|
3258 |
png_byte a = *(sp + 3);
|
|
|
3259 |
|
|
|
3260 |
if (a == 0xff)
|
|
|
3261 |
{
|
|
|
3262 |
*dp = gamma_table[*sp];
|
|
|
3263 |
*(dp + 1) = gamma_table[*(sp + 1)];
|
|
|
3264 |
*(dp + 2) = gamma_table[*(sp + 2)];
|
|
|
3265 |
}
|
|
|
3266 |
else if (a == 0)
|
|
|
3267 |
{
|
|
|
3268 |
/* Background is already in screen gamma */
|
|
|
3269 |
*dp = (png_byte)background->red;
|
|
|
3270 |
*(dp + 1) = (png_byte)background->green;
|
|
|
3271 |
*(dp + 2) = (png_byte)background->blue;
|
|
|
3272 |
}
|
|
|
3273 |
else
|
|
|
3274 |
{
|
|
|
3275 |
png_byte v, w;
|
|
|
3276 |
|
|
|
3277 |
v = gamma_to_1[*sp];
|
|
|
3278 |
png_composite(w, v, a, background_1->red);
|
|
|
3279 |
*dp = gamma_from_1[w];
|
|
|
3280 |
v = gamma_to_1[*(sp + 1)];
|
|
|
3281 |
png_composite(w, v, a, background_1->green);
|
|
|
3282 |
*(dp + 1) = gamma_from_1[w];
|
|
|
3283 |
v = gamma_to_1[*(sp + 2)];
|
|
|
3284 |
png_composite(w, v, a, background_1->blue);
|
|
|
3285 |
*(dp + 2) = gamma_from_1[w];
|
|
|
3286 |
}
|
|
|
3287 |
}
|
|
|
3288 |
}
|
|
|
3289 |
else
|
|
|
3290 |
#endif
|
|
|
3291 |
{
|
|
|
3292 |
sp = row;
|
|
|
3293 |
dp = row;
|
|
|
3294 |
for (i = 0; i < row_width; i++, sp += 4, dp += 3)
|
|
|
3295 |
{
|
|
|
3296 |
png_byte a = *(sp + 3);
|
|
|
3297 |
|
|
|
3298 |
if (a == 0xff)
|
|
|
3299 |
{
|
|
|
3300 |
*dp = *sp;
|
|
|
3301 |
*(dp + 1) = *(sp + 1);
|
|
|
3302 |
*(dp + 2) = *(sp + 2);
|
|
|
3303 |
}
|
|
|
3304 |
else if (a == 0)
|
|
|
3305 |
{
|
|
|
3306 |
*dp = (png_byte)background->red;
|
|
|
3307 |
*(dp + 1) = (png_byte)background->green;
|
|
|
3308 |
*(dp + 2) = (png_byte)background->blue;
|
|
|
3309 |
}
|
|
|
3310 |
else
|
|
|
3311 |
{
|
|
|
3312 |
png_composite(*dp, *sp, a, background->red);
|
|
|
3313 |
png_composite(*(dp + 1), *(sp + 1), a,
|
|
|
3314 |
background->green);
|
|
|
3315 |
png_composite(*(dp + 2), *(sp + 2), a,
|
|
|
3316 |
background->blue);
|
|
|
3317 |
}
|
|
|
3318 |
}
|
|
|
3319 |
}
|
|
|
3320 |
}
|
|
|
3321 |
else /* if (row_info->bit_depth == 16) */
|
|
|
3322 |
{
|
|
|
3323 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3324 |
if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
|
|
|
3325 |
gamma_16_to_1 != NULL)
|
|
|
3326 |
{
|
|
|
3327 |
sp = row;
|
|
|
3328 |
dp = row;
|
|
|
3329 |
for (i = 0; i < row_width; i++, sp += 8, dp += 6)
|
|
|
3330 |
{
|
|
|
3331 |
png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
|
|
|
3332 |
<< 8) + (png_uint_16)(*(sp + 7)));
|
|
|
3333 |
if (a == (png_uint_16)0xffff)
|
|
|
3334 |
{
|
|
|
3335 |
png_uint_16 v;
|
|
|
3336 |
|
|
|
3337 |
v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3338 |
*dp = (png_byte)((v >> 8) & 0xff);
|
|
|
3339 |
*(dp + 1) = (png_byte)(v & 0xff);
|
|
|
3340 |
v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
|
|
|
3341 |
*(dp + 2) = (png_byte)((v >> 8) & 0xff);
|
|
|
3342 |
*(dp + 3) = (png_byte)(v & 0xff);
|
|
|
3343 |
v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
|
|
|
3344 |
*(dp + 4) = (png_byte)((v >> 8) & 0xff);
|
|
|
3345 |
*(dp + 5) = (png_byte)(v & 0xff);
|
|
|
3346 |
}
|
|
|
3347 |
else if (a == 0)
|
|
|
3348 |
{
|
|
|
3349 |
/* Background is already in screen gamma */
|
|
|
3350 |
*dp = (png_byte)((background->red >> 8) & 0xff);
|
|
|
3351 |
*(dp + 1) = (png_byte)(background->red & 0xff);
|
|
|
3352 |
*(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
|
|
|
3353 |
*(dp + 3) = (png_byte)(background->green & 0xff);
|
|
|
3354 |
*(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
|
|
|
3355 |
*(dp + 5) = (png_byte)(background->blue & 0xff);
|
|
|
3356 |
}
|
|
|
3357 |
else
|
|
|
3358 |
{
|
|
|
3359 |
png_uint_16 v, w, x;
|
|
|
3360 |
|
|
|
3361 |
v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3362 |
png_composite_16(w, v, a, background_1->red);
|
|
|
3363 |
x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
|
|
|
3364 |
*dp = (png_byte)((x >> 8) & 0xff);
|
|
|
3365 |
*(dp + 1) = (png_byte)(x & 0xff);
|
|
|
3366 |
v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
|
|
|
3367 |
png_composite_16(w, v, a, background_1->green);
|
|
|
3368 |
x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
|
|
|
3369 |
*(dp + 2) = (png_byte)((x >> 8) & 0xff);
|
|
|
3370 |
*(dp + 3) = (png_byte)(x & 0xff);
|
|
|
3371 |
v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
|
|
|
3372 |
png_composite_16(w, v, a, background_1->blue);
|
|
|
3373 |
x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8];
|
|
|
3374 |
*(dp + 4) = (png_byte)((x >> 8) & 0xff);
|
|
|
3375 |
*(dp + 5) = (png_byte)(x & 0xff);
|
|
|
3376 |
}
|
|
|
3377 |
}
|
|
|
3378 |
}
|
|
|
3379 |
else
|
|
|
3380 |
#endif
|
|
|
3381 |
{
|
|
|
3382 |
sp = row;
|
|
|
3383 |
dp = row;
|
|
|
3384 |
for (i = 0; i < row_width; i++, sp += 8, dp += 6)
|
|
|
3385 |
{
|
|
|
3386 |
png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
|
|
|
3387 |
<< 8) + (png_uint_16)(*(sp + 7)));
|
|
|
3388 |
if (a == (png_uint_16)0xffff)
|
|
|
3389 |
{
|
|
|
3390 |
png_memcpy(dp, sp, 6);
|
|
|
3391 |
}
|
|
|
3392 |
else if (a == 0)
|
|
|
3393 |
{
|
|
|
3394 |
*dp = (png_byte)((background->red >> 8) & 0xff);
|
|
|
3395 |
*(dp + 1) = (png_byte)(background->red & 0xff);
|
|
|
3396 |
*(dp + 2) = (png_byte)((background->green >> 8) & 0xff);
|
|
|
3397 |
*(dp + 3) = (png_byte)(background->green & 0xff);
|
|
|
3398 |
*(dp + 4) = (png_byte)((background->blue >> 8) & 0xff);
|
|
|
3399 |
*(dp + 5) = (png_byte)(background->blue & 0xff);
|
|
|
3400 |
}
|
|
|
3401 |
else
|
|
|
3402 |
{
|
|
|
3403 |
png_uint_16 v;
|
|
|
3404 |
|
|
|
3405 |
png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
|
|
|
3406 |
png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
|
|
|
3407 |
+ *(sp + 3));
|
|
|
3408 |
png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
|
|
|
3409 |
+ *(sp + 5));
|
|
|
3410 |
|
|
|
3411 |
png_composite_16(v, r, a, background->red);
|
|
|
3412 |
*dp = (png_byte)((v >> 8) & 0xff);
|
|
|
3413 |
*(dp + 1) = (png_byte)(v & 0xff);
|
|
|
3414 |
png_composite_16(v, g, a, background->green);
|
|
|
3415 |
*(dp + 2) = (png_byte)((v >> 8) & 0xff);
|
|
|
3416 |
*(dp + 3) = (png_byte)(v & 0xff);
|
|
|
3417 |
png_composite_16(v, b, a, background->blue);
|
|
|
3418 |
*(dp + 4) = (png_byte)((v >> 8) & 0xff);
|
|
|
3419 |
*(dp + 5) = (png_byte)(v & 0xff);
|
|
|
3420 |
}
|
|
|
3421 |
}
|
|
|
3422 |
}
|
|
|
3423 |
}
|
|
|
3424 |
break;
|
|
|
3425 |
}
|
|
|
3426 |
}
|
|
|
3427 |
|
|
|
3428 |
if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
|
|
|
3429 |
{
|
|
|
3430 |
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
|
|
|
3431 |
row_info->channels--;
|
|
|
3432 |
row_info->pixel_depth = (png_byte)(row_info->channels *
|
|
|
3433 |
row_info->bit_depth);
|
|
|
3434 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
3435 |
}
|
|
|
3436 |
}
|
|
|
3437 |
}
|
|
|
3438 |
#endif
|
|
|
3439 |
|
|
|
3440 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3441 |
/* Gamma correct the image, avoiding the alpha channel. Make sure
|
|
|
3442 |
* you do this after you deal with the transparency issue on grayscale
|
|
|
3443 |
* or RGB images. If your bit depth is 8, use gamma_table, if it
|
|
|
3444 |
* is 16, use gamma_16_table and gamma_shift. Build these with
|
|
|
3445 |
* build_gamma_table().
|
|
|
3446 |
*/
|
|
|
3447 |
void /* PRIVATE */
|
|
|
3448 |
png_do_gamma(png_row_infop row_info, png_bytep row,
|
|
|
3449 |
png_bytep gamma_table, png_uint_16pp gamma_16_table,
|
|
|
3450 |
int gamma_shift)
|
|
|
3451 |
{
|
|
|
3452 |
png_bytep sp;
|
|
|
3453 |
png_uint_32 i;
|
|
|
3454 |
png_uint_32 row_width=row_info->width;
|
|
|
3455 |
|
|
|
3456 |
png_debug(1, "in png_do_gamma");
|
|
|
3457 |
if (
|
|
|
3458 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
3459 |
row != NULL && row_info != NULL &&
|
|
|
3460 |
#endif
|
|
|
3461 |
((row_info->bit_depth <= 8 && gamma_table != NULL) ||
|
|
|
3462 |
(row_info->bit_depth == 16 && gamma_16_table != NULL)))
|
|
|
3463 |
{
|
|
|
3464 |
switch (row_info->color_type)
|
|
|
3465 |
{
|
|
|
3466 |
case PNG_COLOR_TYPE_RGB:
|
|
|
3467 |
{
|
|
|
3468 |
if (row_info->bit_depth == 8)
|
|
|
3469 |
{
|
|
|
3470 |
sp = row;
|
|
|
3471 |
for (i = 0; i < row_width; i++)
|
|
|
3472 |
{
|
|
|
3473 |
*sp = gamma_table[*sp];
|
|
|
3474 |
sp++;
|
|
|
3475 |
*sp = gamma_table[*sp];
|
|
|
3476 |
sp++;
|
|
|
3477 |
*sp = gamma_table[*sp];
|
|
|
3478 |
sp++;
|
|
|
3479 |
}
|
|
|
3480 |
}
|
|
|
3481 |
else /* if (row_info->bit_depth == 16) */
|
|
|
3482 |
{
|
|
|
3483 |
sp = row;
|
|
|
3484 |
for (i = 0; i < row_width; i++)
|
|
|
3485 |
{
|
|
|
3486 |
png_uint_16 v;
|
|
|
3487 |
|
|
|
3488 |
v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3489 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3490 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3491 |
sp += 2;
|
|
|
3492 |
v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3493 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3494 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3495 |
sp += 2;
|
|
|
3496 |
v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3497 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3498 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3499 |
sp += 2;
|
|
|
3500 |
}
|
|
|
3501 |
}
|
|
|
3502 |
break;
|
|
|
3503 |
}
|
|
|
3504 |
|
|
|
3505 |
case PNG_COLOR_TYPE_RGB_ALPHA:
|
|
|
3506 |
{
|
|
|
3507 |
if (row_info->bit_depth == 8)
|
|
|
3508 |
{
|
|
|
3509 |
sp = row;
|
|
|
3510 |
for (i = 0; i < row_width; i++)
|
|
|
3511 |
{
|
|
|
3512 |
*sp = gamma_table[*sp];
|
|
|
3513 |
sp++;
|
|
|
3514 |
*sp = gamma_table[*sp];
|
|
|
3515 |
sp++;
|
|
|
3516 |
*sp = gamma_table[*sp];
|
|
|
3517 |
sp++;
|
|
|
3518 |
sp++;
|
|
|
3519 |
}
|
|
|
3520 |
}
|
|
|
3521 |
else /* if (row_info->bit_depth == 16) */
|
|
|
3522 |
{
|
|
|
3523 |
sp = row;
|
|
|
3524 |
for (i = 0; i < row_width; i++)
|
|
|
3525 |
{
|
|
|
3526 |
png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3527 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3528 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3529 |
sp += 2;
|
|
|
3530 |
v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3531 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3532 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3533 |
sp += 2;
|
|
|
3534 |
v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3535 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3536 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3537 |
sp += 4;
|
|
|
3538 |
}
|
|
|
3539 |
}
|
|
|
3540 |
break;
|
|
|
3541 |
}
|
|
|
3542 |
|
|
|
3543 |
case PNG_COLOR_TYPE_GRAY_ALPHA:
|
|
|
3544 |
{
|
|
|
3545 |
if (row_info->bit_depth == 8)
|
|
|
3546 |
{
|
|
|
3547 |
sp = row;
|
|
|
3548 |
for (i = 0; i < row_width; i++)
|
|
|
3549 |
{
|
|
|
3550 |
*sp = gamma_table[*sp];
|
|
|
3551 |
sp += 2;
|
|
|
3552 |
}
|
|
|
3553 |
}
|
|
|
3554 |
else /* if (row_info->bit_depth == 16) */
|
|
|
3555 |
{
|
|
|
3556 |
sp = row;
|
|
|
3557 |
for (i = 0; i < row_width; i++)
|
|
|
3558 |
{
|
|
|
3559 |
png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3560 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3561 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3562 |
sp += 4;
|
|
|
3563 |
}
|
|
|
3564 |
}
|
|
|
3565 |
break;
|
|
|
3566 |
}
|
|
|
3567 |
|
|
|
3568 |
case PNG_COLOR_TYPE_GRAY:
|
|
|
3569 |
{
|
|
|
3570 |
if (row_info->bit_depth == 2)
|
|
|
3571 |
{
|
|
|
3572 |
sp = row;
|
|
|
3573 |
for (i = 0; i < row_width; i += 4)
|
|
|
3574 |
{
|
|
|
3575 |
int a = *sp & 0xc0;
|
|
|
3576 |
int b = *sp & 0x30;
|
|
|
3577 |
int c = *sp & 0x0c;
|
|
|
3578 |
int d = *sp & 0x03;
|
|
|
3579 |
|
|
|
3580 |
*sp = (png_byte)(
|
|
|
3581 |
((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)|
|
|
|
3582 |
((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
|
|
|
3583 |
((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)|
|
|
|
3584 |
((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ));
|
|
|
3585 |
sp++;
|
|
|
3586 |
}
|
|
|
3587 |
}
|
|
|
3588 |
|
|
|
3589 |
if (row_info->bit_depth == 4)
|
|
|
3590 |
{
|
|
|
3591 |
sp = row;
|
|
|
3592 |
for (i = 0; i < row_width; i += 2)
|
|
|
3593 |
{
|
|
|
3594 |
int msb = *sp & 0xf0;
|
|
|
3595 |
int lsb = *sp & 0x0f;
|
|
|
3596 |
|
|
|
3597 |
*sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0)
|
|
|
3598 |
| (((int)gamma_table[(lsb << 4) | lsb]) >> 4));
|
|
|
3599 |
sp++;
|
|
|
3600 |
}
|
|
|
3601 |
}
|
|
|
3602 |
|
|
|
3603 |
else if (row_info->bit_depth == 8)
|
|
|
3604 |
{
|
|
|
3605 |
sp = row;
|
|
|
3606 |
for (i = 0; i < row_width; i++)
|
|
|
3607 |
{
|
|
|
3608 |
*sp = gamma_table[*sp];
|
|
|
3609 |
sp++;
|
|
|
3610 |
}
|
|
|
3611 |
}
|
|
|
3612 |
|
|
|
3613 |
else if (row_info->bit_depth == 16)
|
|
|
3614 |
{
|
|
|
3615 |
sp = row;
|
|
|
3616 |
for (i = 0; i < row_width; i++)
|
|
|
3617 |
{
|
|
|
3618 |
png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
|
|
|
3619 |
*sp = (png_byte)((v >> 8) & 0xff);
|
|
|
3620 |
*(sp + 1) = (png_byte)(v & 0xff);
|
|
|
3621 |
sp += 2;
|
|
|
3622 |
}
|
|
|
3623 |
}
|
|
|
3624 |
break;
|
|
|
3625 |
}
|
|
|
3626 |
}
|
|
|
3627 |
}
|
|
|
3628 |
}
|
|
|
3629 |
#endif
|
|
|
3630 |
|
|
|
3631 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
3632 |
/* Expands a palette row to an RGB or RGBA row depending
|
|
|
3633 |
* upon whether you supply trans and num_trans.
|
|
|
3634 |
*/
|
|
|
3635 |
void /* PRIVATE */
|
|
|
3636 |
png_do_expand_palette(png_row_infop row_info, png_bytep row,
|
|
|
3637 |
png_colorp palette, png_bytep trans, int num_trans)
|
|
|
3638 |
{
|
|
|
3639 |
int shift, value;
|
|
|
3640 |
png_bytep sp, dp;
|
|
|
3641 |
png_uint_32 i;
|
|
|
3642 |
png_uint_32 row_width=row_info->width;
|
|
|
3643 |
|
|
|
3644 |
png_debug(1, "in png_do_expand_palette");
|
|
|
3645 |
if (
|
|
|
3646 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
3647 |
row != NULL && row_info != NULL &&
|
|
|
3648 |
#endif
|
|
|
3649 |
row_info->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
|
3650 |
{
|
|
|
3651 |
if (row_info->bit_depth < 8)
|
|
|
3652 |
{
|
|
|
3653 |
switch (row_info->bit_depth)
|
|
|
3654 |
{
|
|
|
3655 |
case 1:
|
|
|
3656 |
{
|
|
|
3657 |
sp = row + (png_size_t)((row_width - 1) >> 3);
|
|
|
3658 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3659 |
shift = 7 - (int)((row_width + 7) & 0x07);
|
|
|
3660 |
for (i = 0; i < row_width; i++)
|
|
|
3661 |
{
|
|
|
3662 |
if ((*sp >> shift) & 0x01)
|
|
|
3663 |
*dp = 1;
|
|
|
3664 |
else
|
|
|
3665 |
*dp = 0;
|
|
|
3666 |
if (shift == 7)
|
|
|
3667 |
{
|
|
|
3668 |
shift = 0;
|
|
|
3669 |
sp--;
|
|
|
3670 |
}
|
|
|
3671 |
else
|
|
|
3672 |
shift++;
|
|
|
3673 |
|
|
|
3674 |
dp--;
|
|
|
3675 |
}
|
|
|
3676 |
break;
|
|
|
3677 |
}
|
|
|
3678 |
|
|
|
3679 |
case 2:
|
|
|
3680 |
{
|
|
|
3681 |
sp = row + (png_size_t)((row_width - 1) >> 2);
|
|
|
3682 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3683 |
shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
|
|
|
3684 |
for (i = 0; i < row_width; i++)
|
|
|
3685 |
{
|
|
|
3686 |
value = (*sp >> shift) & 0x03;
|
|
|
3687 |
*dp = (png_byte)value;
|
|
|
3688 |
if (shift == 6)
|
|
|
3689 |
{
|
|
|
3690 |
shift = 0;
|
|
|
3691 |
sp--;
|
|
|
3692 |
}
|
|
|
3693 |
else
|
|
|
3694 |
shift += 2;
|
|
|
3695 |
|
|
|
3696 |
dp--;
|
|
|
3697 |
}
|
|
|
3698 |
break;
|
|
|
3699 |
}
|
|
|
3700 |
|
|
|
3701 |
case 4:
|
|
|
3702 |
{
|
|
|
3703 |
sp = row + (png_size_t)((row_width - 1) >> 1);
|
|
|
3704 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3705 |
shift = (int)((row_width & 0x01) << 2);
|
|
|
3706 |
for (i = 0; i < row_width; i++)
|
|
|
3707 |
{
|
|
|
3708 |
value = (*sp >> shift) & 0x0f;
|
|
|
3709 |
*dp = (png_byte)value;
|
|
|
3710 |
if (shift == 4)
|
|
|
3711 |
{
|
|
|
3712 |
shift = 0;
|
|
|
3713 |
sp--;
|
|
|
3714 |
}
|
|
|
3715 |
else
|
|
|
3716 |
shift += 4;
|
|
|
3717 |
|
|
|
3718 |
dp--;
|
|
|
3719 |
}
|
|
|
3720 |
break;
|
|
|
3721 |
}
|
|
|
3722 |
}
|
|
|
3723 |
row_info->bit_depth = 8;
|
|
|
3724 |
row_info->pixel_depth = 8;
|
|
|
3725 |
row_info->rowbytes = row_width;
|
|
|
3726 |
}
|
|
|
3727 |
switch (row_info->bit_depth)
|
|
|
3728 |
{
|
|
|
3729 |
case 8:
|
|
|
3730 |
{
|
|
|
3731 |
if (trans != NULL)
|
|
|
3732 |
{
|
|
|
3733 |
sp = row + (png_size_t)row_width - 1;
|
|
|
3734 |
dp = row + (png_size_t)(row_width << 2) - 1;
|
|
|
3735 |
|
|
|
3736 |
for (i = 0; i < row_width; i++)
|
|
|
3737 |
{
|
|
|
3738 |
if ((int)(*sp) >= num_trans)
|
|
|
3739 |
*dp-- = 0xff;
|
|
|
3740 |
else
|
|
|
3741 |
*dp-- = trans[*sp];
|
|
|
3742 |
*dp-- = palette[*sp].blue;
|
|
|
3743 |
*dp-- = palette[*sp].green;
|
|
|
3744 |
*dp-- = palette[*sp].red;
|
|
|
3745 |
sp--;
|
|
|
3746 |
}
|
|
|
3747 |
row_info->bit_depth = 8;
|
|
|
3748 |
row_info->pixel_depth = 32;
|
|
|
3749 |
row_info->rowbytes = row_width * 4;
|
|
|
3750 |
row_info->color_type = 6;
|
|
|
3751 |
row_info->channels = 4;
|
|
|
3752 |
}
|
|
|
3753 |
else
|
|
|
3754 |
{
|
|
|
3755 |
sp = row + (png_size_t)row_width - 1;
|
|
|
3756 |
dp = row + (png_size_t)(row_width * 3) - 1;
|
|
|
3757 |
|
|
|
3758 |
for (i = 0; i < row_width; i++)
|
|
|
3759 |
{
|
|
|
3760 |
*dp-- = palette[*sp].blue;
|
|
|
3761 |
*dp-- = palette[*sp].green;
|
|
|
3762 |
*dp-- = palette[*sp].red;
|
|
|
3763 |
sp--;
|
|
|
3764 |
}
|
|
|
3765 |
|
|
|
3766 |
row_info->bit_depth = 8;
|
|
|
3767 |
row_info->pixel_depth = 24;
|
|
|
3768 |
row_info->rowbytes = row_width * 3;
|
|
|
3769 |
row_info->color_type = 2;
|
|
|
3770 |
row_info->channels = 3;
|
|
|
3771 |
}
|
|
|
3772 |
break;
|
|
|
3773 |
}
|
|
|
3774 |
}
|
|
|
3775 |
}
|
|
|
3776 |
}
|
|
|
3777 |
|
|
|
3778 |
/* If the bit depth < 8, it is expanded to 8. Also, if the already
|
|
|
3779 |
* expanded transparency value is supplied, an alpha channel is built.
|
|
|
3780 |
*/
|
|
|
3781 |
void /* PRIVATE */
|
|
|
3782 |
png_do_expand(png_row_infop row_info, png_bytep row,
|
|
|
3783 |
png_color_16p trans_value)
|
|
|
3784 |
{
|
|
|
3785 |
int shift, value;
|
|
|
3786 |
png_bytep sp, dp;
|
|
|
3787 |
png_uint_32 i;
|
|
|
3788 |
png_uint_32 row_width=row_info->width;
|
|
|
3789 |
|
|
|
3790 |
png_debug(1, "in png_do_expand");
|
|
|
3791 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
3792 |
if (row != NULL && row_info != NULL)
|
|
|
3793 |
#endif
|
|
|
3794 |
{
|
|
|
3795 |
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
|
|
|
3796 |
{
|
|
|
3797 |
png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0);
|
|
|
3798 |
|
|
|
3799 |
if (row_info->bit_depth < 8)
|
|
|
3800 |
{
|
|
|
3801 |
switch (row_info->bit_depth)
|
|
|
3802 |
{
|
|
|
3803 |
case 1:
|
|
|
3804 |
{
|
|
|
3805 |
gray = (png_uint_16)((gray&0x01)*0xff);
|
|
|
3806 |
sp = row + (png_size_t)((row_width - 1) >> 3);
|
|
|
3807 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3808 |
shift = 7 - (int)((row_width + 7) & 0x07);
|
|
|
3809 |
for (i = 0; i < row_width; i++)
|
|
|
3810 |
{
|
|
|
3811 |
if ((*sp >> shift) & 0x01)
|
|
|
3812 |
*dp = 0xff;
|
|
|
3813 |
else
|
|
|
3814 |
*dp = 0;
|
|
|
3815 |
if (shift == 7)
|
|
|
3816 |
{
|
|
|
3817 |
shift = 0;
|
|
|
3818 |
sp--;
|
|
|
3819 |
}
|
|
|
3820 |
else
|
|
|
3821 |
shift++;
|
|
|
3822 |
|
|
|
3823 |
dp--;
|
|
|
3824 |
}
|
|
|
3825 |
break;
|
|
|
3826 |
}
|
|
|
3827 |
|
|
|
3828 |
case 2:
|
|
|
3829 |
{
|
|
|
3830 |
gray = (png_uint_16)((gray&0x03)*0x55);
|
|
|
3831 |
sp = row + (png_size_t)((row_width - 1) >> 2);
|
|
|
3832 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3833 |
shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
|
|
|
3834 |
for (i = 0; i < row_width; i++)
|
|
|
3835 |
{
|
|
|
3836 |
value = (*sp >> shift) & 0x03;
|
|
|
3837 |
*dp = (png_byte)(value | (value << 2) | (value << 4) |
|
|
|
3838 |
(value << 6));
|
|
|
3839 |
if (shift == 6)
|
|
|
3840 |
{
|
|
|
3841 |
shift = 0;
|
|
|
3842 |
sp--;
|
|
|
3843 |
}
|
|
|
3844 |
else
|
|
|
3845 |
shift += 2;
|
|
|
3846 |
|
|
|
3847 |
dp--;
|
|
|
3848 |
}
|
|
|
3849 |
break;
|
|
|
3850 |
}
|
|
|
3851 |
|
|
|
3852 |
case 4:
|
|
|
3853 |
{
|
|
|
3854 |
gray = (png_uint_16)((gray&0x0f)*0x11);
|
|
|
3855 |
sp = row + (png_size_t)((row_width - 1) >> 1);
|
|
|
3856 |
dp = row + (png_size_t)row_width - 1;
|
|
|
3857 |
shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
|
|
|
3858 |
for (i = 0; i < row_width; i++)
|
|
|
3859 |
{
|
|
|
3860 |
value = (*sp >> shift) & 0x0f;
|
|
|
3861 |
*dp = (png_byte)(value | (value << 4));
|
|
|
3862 |
if (shift == 4)
|
|
|
3863 |
{
|
|
|
3864 |
shift = 0;
|
|
|
3865 |
sp--;
|
|
|
3866 |
}
|
|
|
3867 |
else
|
|
|
3868 |
shift = 4;
|
|
|
3869 |
|
|
|
3870 |
dp--;
|
|
|
3871 |
}
|
|
|
3872 |
break;
|
|
|
3873 |
}
|
|
|
3874 |
}
|
|
|
3875 |
|
|
|
3876 |
row_info->bit_depth = 8;
|
|
|
3877 |
row_info->pixel_depth = 8;
|
|
|
3878 |
row_info->rowbytes = row_width;
|
|
|
3879 |
}
|
|
|
3880 |
|
|
|
3881 |
if (trans_value != NULL)
|
|
|
3882 |
{
|
|
|
3883 |
if (row_info->bit_depth == 8)
|
|
|
3884 |
{
|
|
|
3885 |
gray = gray & 0xff;
|
|
|
3886 |
sp = row + (png_size_t)row_width - 1;
|
|
|
3887 |
dp = row + (png_size_t)(row_width << 1) - 1;
|
|
|
3888 |
for (i = 0; i < row_width; i++)
|
|
|
3889 |
{
|
|
|
3890 |
if (*sp == gray)
|
|
|
3891 |
*dp-- = 0;
|
|
|
3892 |
else
|
|
|
3893 |
*dp-- = 0xff;
|
|
|
3894 |
*dp-- = *sp--;
|
|
|
3895 |
}
|
|
|
3896 |
}
|
|
|
3897 |
|
|
|
3898 |
else if (row_info->bit_depth == 16)
|
|
|
3899 |
{
|
|
|
3900 |
png_byte gray_high = (gray >> 8) & 0xff;
|
|
|
3901 |
png_byte gray_low = gray & 0xff;
|
|
|
3902 |
sp = row + row_info->rowbytes - 1;
|
|
|
3903 |
dp = row + (row_info->rowbytes << 1) - 1;
|
|
|
3904 |
for (i = 0; i < row_width; i++)
|
|
|
3905 |
{
|
|
|
3906 |
if (*(sp - 1) == gray_high && *(sp) == gray_low)
|
|
|
3907 |
{
|
|
|
3908 |
*dp-- = 0;
|
|
|
3909 |
*dp-- = 0;
|
|
|
3910 |
}
|
|
|
3911 |
else
|
|
|
3912 |
{
|
|
|
3913 |
*dp-- = 0xff;
|
|
|
3914 |
*dp-- = 0xff;
|
|
|
3915 |
}
|
|
|
3916 |
*dp-- = *sp--;
|
|
|
3917 |
*dp-- = *sp--;
|
|
|
3918 |
}
|
|
|
3919 |
}
|
|
|
3920 |
|
|
|
3921 |
row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
|
|
|
3922 |
row_info->channels = 2;
|
|
|
3923 |
row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
|
|
|
3924 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
|
|
|
3925 |
row_width);
|
|
|
3926 |
}
|
|
|
3927 |
}
|
|
|
3928 |
else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value)
|
|
|
3929 |
{
|
|
|
3930 |
if (row_info->bit_depth == 8)
|
|
|
3931 |
{
|
|
|
3932 |
png_byte red = trans_value->red & 0xff;
|
|
|
3933 |
png_byte green = trans_value->green & 0xff;
|
|
|
3934 |
png_byte blue = trans_value->blue & 0xff;
|
|
|
3935 |
sp = row + (png_size_t)row_info->rowbytes - 1;
|
|
|
3936 |
dp = row + (png_size_t)(row_width << 2) - 1;
|
|
|
3937 |
for (i = 0; i < row_width; i++)
|
|
|
3938 |
{
|
|
|
3939 |
if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
|
|
|
3940 |
*dp-- = 0;
|
|
|
3941 |
else
|
|
|
3942 |
*dp-- = 0xff;
|
|
|
3943 |
*dp-- = *sp--;
|
|
|
3944 |
*dp-- = *sp--;
|
|
|
3945 |
*dp-- = *sp--;
|
|
|
3946 |
}
|
|
|
3947 |
}
|
|
|
3948 |
else if (row_info->bit_depth == 16)
|
|
|
3949 |
{
|
|
|
3950 |
png_byte red_high = (trans_value->red >> 8) & 0xff;
|
|
|
3951 |
png_byte green_high = (trans_value->green >> 8) & 0xff;
|
|
|
3952 |
png_byte blue_high = (trans_value->blue >> 8) & 0xff;
|
|
|
3953 |
png_byte red_low = trans_value->red & 0xff;
|
|
|
3954 |
png_byte green_low = trans_value->green & 0xff;
|
|
|
3955 |
png_byte blue_low = trans_value->blue & 0xff;
|
|
|
3956 |
sp = row + row_info->rowbytes - 1;
|
|
|
3957 |
dp = row + (png_size_t)(row_width << 3) - 1;
|
|
|
3958 |
for (i = 0; i < row_width; i++)
|
|
|
3959 |
{
|
|
|
3960 |
if (*(sp - 5) == red_high &&
|
|
|
3961 |
*(sp - 4) == red_low &&
|
|
|
3962 |
*(sp - 3) == green_high &&
|
|
|
3963 |
*(sp - 2) == green_low &&
|
|
|
3964 |
*(sp - 1) == blue_high &&
|
|
|
3965 |
*(sp ) == blue_low)
|
|
|
3966 |
{
|
|
|
3967 |
*dp-- = 0;
|
|
|
3968 |
*dp-- = 0;
|
|
|
3969 |
}
|
|
|
3970 |
else
|
|
|
3971 |
{
|
|
|
3972 |
*dp-- = 0xff;
|
|
|
3973 |
*dp-- = 0xff;
|
|
|
3974 |
}
|
|
|
3975 |
*dp-- = *sp--;
|
|
|
3976 |
*dp-- = *sp--;
|
|
|
3977 |
*dp-- = *sp--;
|
|
|
3978 |
*dp-- = *sp--;
|
|
|
3979 |
*dp-- = *sp--;
|
|
|
3980 |
*dp-- = *sp--;
|
|
|
3981 |
}
|
|
|
3982 |
}
|
|
|
3983 |
row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
|
3984 |
row_info->channels = 4;
|
|
|
3985 |
row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
|
|
|
3986 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
3987 |
}
|
|
|
3988 |
}
|
|
|
3989 |
}
|
|
|
3990 |
#endif
|
|
|
3991 |
|
|
|
3992 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
3993 |
void /* PRIVATE */
|
|
|
3994 |
png_do_dither(png_row_infop row_info, png_bytep row,
|
|
|
3995 |
png_bytep palette_lookup, png_bytep dither_lookup)
|
|
|
3996 |
{
|
|
|
3997 |
png_bytep sp, dp;
|
|
|
3998 |
png_uint_32 i;
|
|
|
3999 |
png_uint_32 row_width=row_info->width;
|
|
|
4000 |
|
|
|
4001 |
png_debug(1, "in png_do_dither");
|
|
|
4002 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
4003 |
if (row != NULL && row_info != NULL)
|
|
|
4004 |
#endif
|
|
|
4005 |
{
|
|
|
4006 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
|
|
|
4007 |
palette_lookup && row_info->bit_depth == 8)
|
|
|
4008 |
{
|
|
|
4009 |
int r, g, b, p;
|
|
|
4010 |
sp = row;
|
|
|
4011 |
dp = row;
|
|
|
4012 |
for (i = 0; i < row_width; i++)
|
|
|
4013 |
{
|
|
|
4014 |
r = *sp++;
|
|
|
4015 |
g = *sp++;
|
|
|
4016 |
b = *sp++;
|
|
|
4017 |
|
|
|
4018 |
/* This looks real messy, but the compiler will reduce
|
|
|
4019 |
* it down to a reasonable formula. For example, with
|
|
|
4020 |
* 5 bits per color, we get:
|
|
|
4021 |
* p = (((r >> 3) & 0x1f) << 10) |
|
|
|
4022 |
* (((g >> 3) & 0x1f) << 5) |
|
|
|
4023 |
* ((b >> 3) & 0x1f);
|
|
|
4024 |
*/
|
|
|
4025 |
p = (((r >> (8 - PNG_DITHER_RED_BITS)) &
|
|
|
4026 |
((1 << PNG_DITHER_RED_BITS) - 1)) <<
|
|
|
4027 |
(PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) |
|
|
|
4028 |
(((g >> (8 - PNG_DITHER_GREEN_BITS)) &
|
|
|
4029 |
((1 << PNG_DITHER_GREEN_BITS) - 1)) <<
|
|
|
4030 |
(PNG_DITHER_BLUE_BITS)) |
|
|
|
4031 |
((b >> (8 - PNG_DITHER_BLUE_BITS)) &
|
|
|
4032 |
((1 << PNG_DITHER_BLUE_BITS) - 1));
|
|
|
4033 |
|
|
|
4034 |
*dp++ = palette_lookup[p];
|
|
|
4035 |
}
|
|
|
4036 |
row_info->color_type = PNG_COLOR_TYPE_PALETTE;
|
|
|
4037 |
row_info->channels = 1;
|
|
|
4038 |
row_info->pixel_depth = row_info->bit_depth;
|
|
|
4039 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
4040 |
}
|
|
|
4041 |
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
|
|
|
4042 |
palette_lookup != NULL && row_info->bit_depth == 8)
|
|
|
4043 |
{
|
|
|
4044 |
int r, g, b, p;
|
|
|
4045 |
sp = row;
|
|
|
4046 |
dp = row;
|
|
|
4047 |
for (i = 0; i < row_width; i++)
|
|
|
4048 |
{
|
|
|
4049 |
r = *sp++;
|
|
|
4050 |
g = *sp++;
|
|
|
4051 |
b = *sp++;
|
|
|
4052 |
sp++;
|
|
|
4053 |
|
|
|
4054 |
p = (((r >> (8 - PNG_DITHER_RED_BITS)) &
|
|
|
4055 |
((1 << PNG_DITHER_RED_BITS) - 1)) <<
|
|
|
4056 |
(PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) |
|
|
|
4057 |
(((g >> (8 - PNG_DITHER_GREEN_BITS)) &
|
|
|
4058 |
((1 << PNG_DITHER_GREEN_BITS) - 1)) <<
|
|
|
4059 |
(PNG_DITHER_BLUE_BITS)) |
|
|
|
4060 |
((b >> (8 - PNG_DITHER_BLUE_BITS)) &
|
|
|
4061 |
((1 << PNG_DITHER_BLUE_BITS) - 1));
|
|
|
4062 |
|
|
|
4063 |
*dp++ = palette_lookup[p];
|
|
|
4064 |
}
|
|
|
4065 |
row_info->color_type = PNG_COLOR_TYPE_PALETTE;
|
|
|
4066 |
row_info->channels = 1;
|
|
|
4067 |
row_info->pixel_depth = row_info->bit_depth;
|
|
|
4068 |
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
|
|
|
4069 |
}
|
|
|
4070 |
else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
|
|
|
4071 |
dither_lookup && row_info->bit_depth == 8)
|
|
|
4072 |
{
|
|
|
4073 |
sp = row;
|
|
|
4074 |
for (i = 0; i < row_width; i++, sp++)
|
|
|
4075 |
{
|
|
|
4076 |
*sp = dither_lookup[*sp];
|
|
|
4077 |
}
|
|
|
4078 |
}
|
|
|
4079 |
}
|
|
|
4080 |
}
|
|
|
4081 |
#endif
|
|
|
4082 |
|
|
|
4083 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
4084 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
4085 |
static PNG_CONST int png_gamma_shift[] =
|
|
|
4086 |
{0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0, 0x00};
|
|
|
4087 |
|
|
|
4088 |
/* We build the 8- or 16-bit gamma tables here. Note that for 16-bit
|
|
|
4089 |
* tables, we don't make a full table if we are reducing to 8-bit in
|
|
|
4090 |
* the future. Note also how the gamma_16 tables are segmented so that
|
|
|
4091 |
* we don't need to allocate > 64K chunks for a full 16-bit table.
|
|
|
4092 |
*/
|
|
|
4093 |
void /* PRIVATE */
|
|
|
4094 |
png_build_gamma_table(png_structp png_ptr)
|
|
|
4095 |
{
|
|
|
4096 |
png_debug(1, "in png_build_gamma_table");
|
|
|
4097 |
|
|
|
4098 |
if (png_ptr->bit_depth <= 8)
|
|
|
4099 |
{
|
|
|
4100 |
int i;
|
|
|
4101 |
double g;
|
|
|
4102 |
|
|
|
4103 |
if (png_ptr->screen_gamma > .000001)
|
|
|
4104 |
g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
|
|
|
4105 |
|
|
|
4106 |
else
|
|
|
4107 |
g = 1.0;
|
|
|
4108 |
|
|
|
4109 |
png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr,
|
|
|
4110 |
(png_uint_32)256);
|
|
|
4111 |
|
|
|
4112 |
for (i = 0; i < 256; i++)
|
|
|
4113 |
{
|
|
|
4114 |
png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0,
|
|
|
4115 |
g) * 255.0 + .5);
|
|
|
4116 |
}
|
|
|
4117 |
|
|
|
4118 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|
|
4119 |
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
4120 |
if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
|
|
|
4121 |
{
|
|
|
4122 |
|
|
|
4123 |
g = 1.0 / (png_ptr->gamma);
|
|
|
4124 |
|
|
|
4125 |
png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr,
|
|
|
4126 |
(png_uint_32)256);
|
|
|
4127 |
|
|
|
4128 |
for (i = 0; i < 256; i++)
|
|
|
4129 |
{
|
|
|
4130 |
png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0,
|
|
|
4131 |
g) * 255.0 + .5);
|
|
|
4132 |
}
|
|
|
4133 |
|
|
|
4134 |
|
|
|
4135 |
png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
|
|
|
4136 |
(png_uint_32)256);
|
|
|
4137 |
|
|
|
4138 |
if (png_ptr->screen_gamma > 0.000001)
|
|
|
4139 |
g = 1.0 / png_ptr->screen_gamma;
|
|
|
4140 |
|
|
|
4141 |
else
|
|
|
4142 |
g = png_ptr->gamma; /* Probably doing rgb_to_gray */
|
|
|
4143 |
|
|
|
4144 |
for (i = 0; i < 256; i++)
|
|
|
4145 |
{
|
|
|
4146 |
png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0,
|
|
|
4147 |
g) * 255.0 + .5);
|
|
|
4148 |
|
|
|
4149 |
}
|
|
|
4150 |
}
|
|
|
4151 |
#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
|
|
|
4152 |
}
|
|
|
4153 |
else
|
|
|
4154 |
{
|
|
|
4155 |
double g;
|
|
|
4156 |
int i, j, shift, num;
|
|
|
4157 |
int sig_bit;
|
|
|
4158 |
png_uint_32 ig;
|
|
|
4159 |
|
|
|
4160 |
if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
|
|
|
4161 |
{
|
|
|
4162 |
sig_bit = (int)png_ptr->sig_bit.red;
|
|
|
4163 |
|
|
|
4164 |
if ((int)png_ptr->sig_bit.green > sig_bit)
|
|
|
4165 |
sig_bit = png_ptr->sig_bit.green;
|
|
|
4166 |
|
|
|
4167 |
if ((int)png_ptr->sig_bit.blue > sig_bit)
|
|
|
4168 |
sig_bit = png_ptr->sig_bit.blue;
|
|
|
4169 |
}
|
|
|
4170 |
else
|
|
|
4171 |
{
|
|
|
4172 |
sig_bit = (int)png_ptr->sig_bit.gray;
|
|
|
4173 |
}
|
|
|
4174 |
|
|
|
4175 |
if (sig_bit > 0)
|
|
|
4176 |
shift = 16 - sig_bit;
|
|
|
4177 |
|
|
|
4178 |
else
|
|
|
4179 |
shift = 0;
|
|
|
4180 |
|
|
|
4181 |
if (png_ptr->transformations & PNG_16_TO_8)
|
|
|
4182 |
{
|
|
|
4183 |
if (shift < (16 - PNG_MAX_GAMMA_8))
|
|
|
4184 |
shift = (16 - PNG_MAX_GAMMA_8);
|
|
|
4185 |
}
|
|
|
4186 |
|
|
|
4187 |
if (shift > 8)
|
|
|
4188 |
shift = 8;
|
|
|
4189 |
|
|
|
4190 |
if (shift < 0)
|
|
|
4191 |
shift = 0;
|
|
|
4192 |
|
|
|
4193 |
png_ptr->gamma_shift = (png_byte)shift;
|
|
|
4194 |
|
|
|
4195 |
num = (1 << (8 - shift));
|
|
|
4196 |
|
|
|
4197 |
if (png_ptr->screen_gamma > .000001)
|
|
|
4198 |
g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
|
|
|
4199 |
else
|
|
|
4200 |
g = 1.0;
|
|
|
4201 |
|
|
|
4202 |
png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
|
|
|
4203 |
(png_uint_32)(num * png_sizeof(png_uint_16p)));
|
|
|
4204 |
png_memset(png_ptr->gamma_16_table, 0, num * png_sizeof(png_uint_16p));
|
|
|
4205 |
|
|
|
4206 |
if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
|
|
|
4207 |
{
|
|
|
4208 |
double fin, fout;
|
|
|
4209 |
png_uint_32 last, max;
|
|
|
4210 |
|
|
|
4211 |
for (i = 0; i < num; i++)
|
|
|
4212 |
{
|
|
|
4213 |
png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
|
|
|
4214 |
(png_uint_32)(256 * png_sizeof(png_uint_16)));
|
|
|
4215 |
}
|
|
|
4216 |
|
|
|
4217 |
g = 1.0 / g;
|
|
|
4218 |
last = 0;
|
|
|
4219 |
for (i = 0; i < 256; i++)
|
|
|
4220 |
{
|
|
|
4221 |
fout = ((double)i + 0.5) / 256.0;
|
|
|
4222 |
fin = pow(fout, g);
|
|
|
4223 |
max = (png_uint_32)(fin * (double)((png_uint_32)num << 8));
|
|
|
4224 |
while (last <= max)
|
|
|
4225 |
{
|
|
|
4226 |
png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
|
|
|
4227 |
[(int)(last >> (8 - shift))] = (png_uint_16)(
|
|
|
4228 |
(png_uint_16)i | ((png_uint_16)i << 8));
|
|
|
4229 |
last++;
|
|
|
4230 |
}
|
|
|
4231 |
}
|
|
|
4232 |
while (last < ((png_uint_32)num << 8))
|
|
|
4233 |
{
|
|
|
4234 |
png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
|
|
|
4235 |
[(int)(last >> (8 - shift))] = (png_uint_16)65535L;
|
|
|
4236 |
last++;
|
|
|
4237 |
}
|
|
|
4238 |
}
|
|
|
4239 |
else
|
|
|
4240 |
{
|
|
|
4241 |
for (i = 0; i < num; i++)
|
|
|
4242 |
{
|
|
|
4243 |
png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
|
|
|
4244 |
(png_uint_32)(256 * png_sizeof(png_uint_16)));
|
|
|
4245 |
|
|
|
4246 |
ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
|
|
|
4247 |
|
|
|
4248 |
for (j = 0; j < 256; j++)
|
|
|
4249 |
{
|
|
|
4250 |
png_ptr->gamma_16_table[i][j] =
|
|
|
4251 |
(png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
|
|
|
4252 |
65535.0, g) * 65535.0 + .5);
|
|
|
4253 |
}
|
|
|
4254 |
}
|
|
|
4255 |
}
|
|
|
4256 |
|
|
|
4257 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|
|
4258 |
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
4259 |
if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
|
|
|
4260 |
{
|
|
|
4261 |
|
|
|
4262 |
g = 1.0 / (png_ptr->gamma);
|
|
|
4263 |
|
|
|
4264 |
png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
|
|
|
4265 |
(png_uint_32)(num * png_sizeof(png_uint_16p )));
|
|
|
4266 |
png_memset(png_ptr->gamma_16_to_1, 0, num * png_sizeof(png_uint_16p));
|
|
|
4267 |
|
|
|
4268 |
for (i = 0; i < num; i++)
|
|
|
4269 |
{
|
|
|
4270 |
png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
|
|
|
4271 |
(png_uint_32)(256 * png_sizeof(png_uint_16)));
|
|
|
4272 |
|
|
|
4273 |
ig = (((png_uint_32)i *
|
|
|
4274 |
(png_uint_32)png_gamma_shift[shift]) >> 4);
|
|
|
4275 |
for (j = 0; j < 256; j++)
|
|
|
4276 |
{
|
|
|
4277 |
png_ptr->gamma_16_to_1[i][j] =
|
|
|
4278 |
(png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
|
|
|
4279 |
65535.0, g) * 65535.0 + .5);
|
|
|
4280 |
}
|
|
|
4281 |
}
|
|
|
4282 |
|
|
|
4283 |
if (png_ptr->screen_gamma > 0.000001)
|
|
|
4284 |
g = 1.0 / png_ptr->screen_gamma;
|
|
|
4285 |
|
|
|
4286 |
else
|
|
|
4287 |
g = png_ptr->gamma; /* Probably doing rgb_to_gray */
|
|
|
4288 |
|
|
|
4289 |
png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
|
|
|
4290 |
(png_uint_32)(num * png_sizeof(png_uint_16p)));
|
|
|
4291 |
png_memset(png_ptr->gamma_16_from_1, 0,
|
|
|
4292 |
num * png_sizeof(png_uint_16p));
|
|
|
4293 |
|
|
|
4294 |
for (i = 0; i < num; i++)
|
|
|
4295 |
{
|
|
|
4296 |
png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
|
|
|
4297 |
(png_uint_32)(256 * png_sizeof(png_uint_16)));
|
|
|
4298 |
|
|
|
4299 |
ig = (((png_uint_32)i *
|
|
|
4300 |
(png_uint_32)png_gamma_shift[shift]) >> 4);
|
|
|
4301 |
|
|
|
4302 |
for (j = 0; j < 256; j++)
|
|
|
4303 |
{
|
|
|
4304 |
png_ptr->gamma_16_from_1[i][j] =
|
|
|
4305 |
(png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
|
|
|
4306 |
65535.0, g) * 65535.0 + .5);
|
|
|
4307 |
}
|
|
|
4308 |
}
|
|
|
4309 |
}
|
|
|
4310 |
#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
|
|
|
4311 |
}
|
|
|
4312 |
}
|
|
|
4313 |
#endif
|
|
|
4314 |
/* To do: install integer version of png_build_gamma_table here */
|
|
|
4315 |
#endif
|
|
|
4316 |
|
|
|
4317 |
#if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|
|
4318 |
/* Undoes intrapixel differencing */
|
|
|
4319 |
void /* PRIVATE */
|
|
|
4320 |
png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
|
|
|
4321 |
{
|
|
|
4322 |
png_debug(1, "in png_do_read_intrapixel");
|
|
|
4323 |
if (
|
|
|
4324 |
#if defined(PNG_USELESS_TESTS_SUPPORTED)
|
|
|
4325 |
row != NULL && row_info != NULL &&
|
|
|
4326 |
#endif
|
|
|
4327 |
(row_info->color_type & PNG_COLOR_MASK_COLOR))
|
|
|
4328 |
{
|
|
|
4329 |
int bytes_per_pixel;
|
|
|
4330 |
png_uint_32 row_width = row_info->width;
|
|
|
4331 |
if (row_info->bit_depth == 8)
|
|
|
4332 |
{
|
|
|
4333 |
png_bytep rp;
|
|
|
4334 |
png_uint_32 i;
|
|
|
4335 |
|
|
|
4336 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
|
|
4337 |
bytes_per_pixel = 3;
|
|
|
4338 |
|
|
|
4339 |
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
|
4340 |
bytes_per_pixel = 4;
|
|
|
4341 |
|
|
|
4342 |
else
|
|
|
4343 |
return;
|
|
|
4344 |
|
|
|
4345 |
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
|
|
|
4346 |
{
|
|
|
4347 |
*(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
|
|
|
4348 |
*(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
|
|
|
4349 |
}
|
|
|
4350 |
}
|
|
|
4351 |
else if (row_info->bit_depth == 16)
|
|
|
4352 |
{
|
|
|
4353 |
png_bytep rp;
|
|
|
4354 |
png_uint_32 i;
|
|
|
4355 |
|
|
|
4356 |
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
|
|
4357 |
bytes_per_pixel = 6;
|
|
|
4358 |
|
|
|
4359 |
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
|
|
4360 |
bytes_per_pixel = 8;
|
|
|
4361 |
|
|
|
4362 |
else
|
|
|
4363 |
return;
|
|
|
4364 |
|
|
|
4365 |
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
|
|
|
4366 |
{
|
|
|
4367 |
png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
|
|
|
4368 |
png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
|
|
|
4369 |
png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
|
|
|
4370 |
png_uint_32 red = (png_uint_32)((s0 + s1 + 65536L) & 0xffffL);
|
|
|
4371 |
png_uint_32 blue = (png_uint_32)((s2 + s1 + 65536L) & 0xffffL);
|
|
|
4372 |
*(rp ) = (png_byte)((red >> 8) & 0xff);
|
|
|
4373 |
*(rp+1) = (png_byte)(red & 0xff);
|
|
|
4374 |
*(rp+4) = (png_byte)((blue >> 8) & 0xff);
|
|
|
4375 |
*(rp+5) = (png_byte)(blue & 0xff);
|
|
|
4376 |
}
|
|
|
4377 |
}
|
|
|
4378 |
}
|
|
|
4379 |
}
|
|
|
4380 |
#endif /* PNG_MNG_FEATURES_SUPPORTED */
|
|
|
4381 |
#endif /* PNG_READ_SUPPORTED */
|