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[master] Imported from libpng-1.4.0beta97.tar

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This commit is contained in:
Glenn Randers-Pehrson
2009-11-12 18:07:00 -06:00
parent 6099e57b07
commit dcdc92c80c
127 changed files with 4985 additions and 6915 deletions
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463
pngrtran.c
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@@ -1,7 +1,7 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
* Last changed in libpng 1.2.41 [November 11, 2009]
* Last changed in libpng 1.4.0 [November 13, 2009]
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -16,9 +16,9 @@
* in pngtrans.c.
*/
#define PNG_INTERNAL
#include "png.h"
#ifdef PNG_READ_SUPPORTED
#include "pngpriv.h"
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
void PNGAPI
@@ -48,7 +48,7 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */
png_warning(png_ptr,
"Can't discard critical data on CRC error.");
"Can't discard critical data on CRC error");
case PNG_CRC_ERROR_QUIT: /* Error/quit */
case PNG_CRC_DEFAULT:
@@ -140,6 +140,22 @@ png_set_strip_alpha(png_structp png_ptr)
}
#endif
#ifdef PNG_READ_PREMULTIPLY_ALPHA_SUPPORTED
void PNGAPI
png_set_premultiply_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_premultiply_alpha");
if(png_ptr == NULL)
return;
png_ptr->transformations |=
(PNG_PREMULTIPLY_ALPHA | PNG_EXPAND_tRNS);
png_ptr->transformations |=
PNG_EXPAND; /* This shouldn't be necessary */
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#endif
#ifdef PNG_READ_DITHER_SUPPORTED
/* Dither file to 8 bit. Supply a palette, the current number
* of elements in the palette, the maximum number of elements
@@ -609,7 +625,6 @@ png_set_palette_to_rgb(png_structp png_ptr)
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#ifndef PNG_1_0_X
/* Expand grayscale images of less than 8-bit depth to 8 bits. */
void PNGAPI
png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
@@ -622,22 +637,7 @@ png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
png_ptr->transformations |= PNG_EXPAND;
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
}
#endif
#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
/* Expand grayscale images of less than 8-bit depth to 8 bits. */
/* Deprecated as of libpng-1.2.9 */
void PNGAPI
png_set_gray_1_2_4_to_8(png_structp png_ptr)
{
png_debug(1, "in png_set_gray_1_2_4_to_8");
if (png_ptr == NULL)
return;
png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
}
#endif
/* Expand tRNS chunks to alpha channels. */
@@ -705,7 +705,7 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
#else
{
png_warning(png_ptr,
"Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
"Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED");
png_ptr->transformations &= ~PNG_RGB_TO_GRAY;
}
#endif
@@ -736,7 +736,6 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
defined(PNG_LEGACY_SUPPORTED) || \
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
void PNGAPI
png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
@@ -751,11 +750,6 @@ png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
png_ptr->transformations |= PNG_USER_TRANSFORM;
png_ptr->read_user_transform_fn = read_user_transform_fn;
#endif
#ifdef PNG_LEGACY_SUPPORTED
if (read_user_transform_fn)
png_warning(png_ptr,
"This version of libpng does not support user transforms");
#endif
}
#endif
@@ -767,9 +761,6 @@ png_init_read_transformations(png_structp png_ptr)
{
png_debug(1, "in png_init_read_transformations");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (png_ptr != NULL)
#endif
{
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \
|| defined(PNG_READ_GAMMA_SUPPORTED)
@@ -818,9 +809,9 @@ png_init_read_transformations(png_structp png_ptr)
= png_ptr->background.blue = png_ptr->background.gray;
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
{
png_ptr->trans_values.gray *= (png_uint_16)0xff;
png_ptr->trans_values.red = png_ptr->trans_values.green
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
png_ptr->trans_color.gray *= (png_uint_16)0xff;
png_ptr->trans_color.red = png_ptr->trans_color.green
= png_ptr->trans_color.blue = png_ptr->trans_color.gray;
}
break;
@@ -830,9 +821,9 @@ png_init_read_transformations(png_structp png_ptr)
= png_ptr->background.blue = png_ptr->background.gray;
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
{
png_ptr->trans_values.gray *= (png_uint_16)0x55;
png_ptr->trans_values.red = png_ptr->trans_values.green
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
png_ptr->trans_color.gray *= (png_uint_16)0x55;
png_ptr->trans_color.red = png_ptr->trans_color.green
= png_ptr->trans_color.blue = png_ptr->trans_color.gray;
}
break;
@@ -842,9 +833,9 @@ png_init_read_transformations(png_structp png_ptr)
= png_ptr->background.blue = png_ptr->background.gray;
if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
{
png_ptr->trans_values.gray *= (png_uint_16)0x11;
png_ptr->trans_values.red = png_ptr->trans_values.green
= png_ptr->trans_values.blue = png_ptr->trans_values.gray;
png_ptr->trans_color.gray *= (png_uint_16)0x11;
png_ptr->trans_color.red = png_ptr->trans_color.green
= png_ptr->trans_color.blue = png_ptr->trans_color.gray;
}
break;
@@ -878,7 +869,7 @@ png_init_read_transformations(png_structp png_ptr)
int i, istop;
istop=(int)png_ptr->num_trans;
for (i=0; i<istop; i++)
png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]);
png_ptr->trans_alpha[i] = (png_byte)(255 - png_ptr->trans_alpha[i]);
}
}
#endif
@@ -900,7 +891,7 @@ png_init_read_transformations(png_structp png_ptr)
k=0;
for (i=0; i<png_ptr->num_trans; i++)
{
if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff)
if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff)
k=1; /* Partial transparency is present */
}
if (k == 0)
@@ -982,26 +973,26 @@ png_init_read_transformations(png_structp png_ptr)
}
for (i = 0; i < num_palette; i++)
{
if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff)
if (i < (int)png_ptr->num_trans && png_ptr->trans_alpha[i] != 0xff)
{
if (png_ptr->trans[i] == 0)
if (png_ptr->trans_alpha[i] == 0)
{
palette[i] = back;
}
else /* if (png_ptr->trans[i] != 0xff) */
else /* if (png_ptr->trans_alpha[i] != 0xff) */
{
png_byte v, w;
v = png_ptr->gamma_to_1[palette[i].red];
png_composite(w, v, png_ptr->trans[i], back_1.red);
png_composite(w, v, png_ptr->trans_alpha[i], back_1.red);
palette[i].red = png_ptr->gamma_from_1[w];
v = png_ptr->gamma_to_1[palette[i].green];
png_composite(w, v, png_ptr->trans[i], back_1.green);
png_composite(w, v, png_ptr->trans_alpha[i], back_1.green);
palette[i].green = png_ptr->gamma_from_1[w];
v = png_ptr->gamma_to_1[palette[i].blue];
png_composite(w, v, png_ptr->trans[i], back_1.blue);
png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue);
palette[i].blue = png_ptr->gamma_from_1[w];
}
}
@@ -1121,19 +1112,19 @@ png_init_read_transformations(png_structp png_ptr)
for (i = 0; i < istop; i++)
{
if (png_ptr->trans[i] == 0)
if (png_ptr->trans_alpha[i] == 0)
{
palette[i] = back;
}
else if (png_ptr->trans[i] != 0xff)
else if (png_ptr->trans_alpha[i] != 0xff)
{
/* The png_composite() macro is defined in png.h */
png_composite(palette[i].red, palette[i].red,
png_ptr->trans[i], back.red);
png_ptr->trans_alpha[i], back.red);
png_composite(palette[i].green, palette[i].green,
png_ptr->trans[i], back.green);
png_ptr->trans_alpha[i], back.green);
png_composite(palette[i].blue, palette[i].blue,
png_ptr->trans[i], back.blue);
png_ptr->trans_alpha[i], back.blue);
}
}
@@ -1287,10 +1278,8 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
{
info_ptr->channels++;
/* If adding a true alpha channel not just filler */
#ifndef PNG_1_0_X
if (png_ptr->transformations & PNG_ADD_ALPHA)
info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
#endif
}
#endif
@@ -1327,7 +1316,7 @@ png_do_read_transformations(png_structp png_ptr)
if (png_ptr->row_buf == NULL)
{
#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
#ifdef PNG_STDIO_SUPPORTED
char msg[50];
png_snprintf2(msg, 50,
@@ -1357,14 +1346,14 @@ png_do_read_transformations(png_structp png_ptr)
if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE)
{
png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1,
png_ptr->palette, png_ptr->trans, png_ptr->num_trans);
png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
}
else
{
if (png_ptr->num_trans &&
(png_ptr->transformations & PNG_EXPAND_tRNS))
png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
&(png_ptr->trans_values));
&(png_ptr->trans_color));
else
png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
NULL);
@@ -1446,7 +1435,7 @@ png_do_read_transformations(png_structp png_ptr)
((png_ptr->num_trans != 0 ) ||
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
&(png_ptr->trans_values), &(png_ptr->background)
&(png_ptr->trans_color), &(png_ptr->background)
#ifdef PNG_READ_GAMMA_SUPPORTED
, &(png_ptr->background_1),
png_ptr->gamma_table, png_ptr->gamma_from_1,
@@ -1519,6 +1508,12 @@ png_do_read_transformations(png_structp png_ptr)
(png_uint_32)png_ptr->filler, png_ptr->flags);
#endif
#ifdef PNG_READ_PREMULTIPLY_ALPHA_SUPPORTED
if (png_ptr->transformations & PNG_PREMULTIPLY_ALPHA)
png_do_read_premultiply_alpha(&(png_ptr->row_info),
png_ptr->row_buf + 1);
#endif
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
if (png_ptr->transformations & PNG_INVERT_ALPHA)
png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -1575,11 +1570,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_unpack");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL && row_info->bit_depth < 8)
#else
if (row_info->bit_depth < 8)
#endif
{
png_uint_32 i;
png_uint_32 row_width=row_info->width;
@@ -1669,9 +1660,6 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
png_debug(1, "in png_do_unshift");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL && sig_bits != NULL &&
#endif
row_info->color_type != PNG_COLOR_TYPE_PALETTE)
{
int shift[4];
@@ -1778,11 +1766,7 @@ png_do_chop(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_chop");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL && row_info->bit_depth == 16)
#else
if (row_info->bit_depth == 16)
#endif
{
png_bytep sp = row;
png_bytep dp = row;
@@ -1836,9 +1820,6 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_read_swap_alpha");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL)
#endif
{
png_uint_32 row_width = row_info->width;
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
@@ -1929,9 +1910,6 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_read_invert_alpha");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL)
#endif
{
png_uint_32 row_width = row_info->width;
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
@@ -2022,6 +2000,85 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
}
#endif
#ifdef PNG_READ_PREMULTIPLY_ALPHA_SUPPORTED
void /* PRIVATE */
png_do_read_premultiply_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_read_premultiply_alpha");
{
png_uint_32 row_width = row_info->width;
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
/* This premultiplies the pixels with the alpha channel in RGBA */
if (row_info->bit_depth == 8)
{
png_bytep sp = row + row_info->rowbytes;
png_bytep dp = sp;
png_uint_16 a = 0;
png_uint_32 i;
for (i = 0; i < row_width; i++)
{
a = *(--sp); --dp;
*(--dp) = (*(--sp) * a) / 255;
*(--dp) = (*(--sp) * a) / 255;
*(--dp) = (*(--sp) * a) / 255;
}
}
/* This premultiplies the pixels with the alpha channel in RRGGBBAA */
else
{
png_uint_16p sp = (png_uint_16p)(row + row_info->rowbytes);
png_uint_16p dp = sp;
png_uint_32 a = 0;
png_uint_32 i;
for (i = 0; i < row_width; i++)
{
a = *(--sp); --dp;
*(--dp) = (png_uint_16) ((*(--sp) * a) / 65535);
*(--dp) = (png_uint_16) ((*(--sp) * a) / 65535);
*(--dp) = (png_uint_16) ((*(--sp) * a) / 65535);
}
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
/* This premultiplies the pixels with the alpha channel in GA */
if (row_info->bit_depth == 8)
{
png_bytep sp = row + row_info->rowbytes;
png_bytep dp = sp;
png_uint_16 a = 0;
png_uint_32 i;
for (i = 0; i < row_width; i++)
{
a = *(--sp); --dp;
*(--dp) = (*(--sp) * a) / 255;
}
}
/* This premultiplies the pixels with the alpha channel in GGAA */
else
{
png_uint_16p sp = (png_uint_16p) (row + row_info->rowbytes);
png_uint_16p dp = sp;
png_uint_32 a = 0;
png_uint_32 i;
for (i = 0; i < row_width; i++)
{
a = *(--sp); --dp;
*(--dp) = (png_uint_16) ((*(--sp) * a) / 65535);
}
}
}
}
}
#endif
#ifdef PNG_READ_FILLER_SUPPORTED
/* Add filler channel if we have RGB color */
void /* PRIVATE */
@@ -2037,9 +2094,6 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_read_filler");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
if (row_info->bit_depth == 8)
@@ -2210,9 +2264,6 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
png_debug(1, "in png_do_gray_to_rgb");
if (row_info->bit_depth >= 8 &&
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
!(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
@@ -2317,9 +2368,6 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
png_debug(1, "in png_do_rgb_to_gray");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
@@ -2594,188 +2642,6 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette)
}
}
/* This function is currently unused. Do we really need it? */
#if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED)
void /* PRIVATE */
png_correct_palette(png_structp png_ptr, png_colorp palette,
int num_palette)
{
png_debug(1, "in png_correct_palette");
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
{
png_color back, back_1;
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
{
back.red = png_ptr->gamma_table[png_ptr->background.red];
back.green = png_ptr->gamma_table[png_ptr->background.green];
back.blue = png_ptr->gamma_table[png_ptr->background.blue];
back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
}
else
{
double g;
g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma);
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN ||
fabs(g - 1.0) < PNG_GAMMA_THRESHOLD)
{
back.red = png_ptr->background.red;
back.green = png_ptr->background.green;
back.blue = png_ptr->background.blue;
}
else
{
back.red =
(png_byte)(pow((double)png_ptr->background.red/255, g) *
255.0 + 0.5);
back.green =
(png_byte)(pow((double)png_ptr->background.green/255, g) *
255.0 + 0.5);
back.blue =
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
255.0 + 0.5);
}
g = 1.0 / png_ptr->background_gamma;
back_1.red =
(png_byte)(pow((double)png_ptr->background.red/255, g) *
255.0 + 0.5);
back_1.green =
(png_byte)(pow((double)png_ptr->background.green/255, g) *
255.0 + 0.5);
back_1.blue =
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
255.0 + 0.5);
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_uint_32 i;
for (i = 0; i < (png_uint_32)num_palette; i++)
{
if (i < png_ptr->num_trans && png_ptr->trans[i] == 0)
{
palette[i] = back;
}
else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff)
{
png_byte v, w;
v = png_ptr->gamma_to_1[png_ptr->palette[i].red];
png_composite(w, v, png_ptr->trans[i], back_1.red);
palette[i].red = png_ptr->gamma_from_1[w];
v = png_ptr->gamma_to_1[png_ptr->palette[i].green];
png_composite(w, v, png_ptr->trans[i], back_1.green);
palette[i].green = png_ptr->gamma_from_1[w];
v = png_ptr->gamma_to_1[png_ptr->palette[i].blue];
png_composite(w, v, png_ptr->trans[i], back_1.blue);
palette[i].blue = png_ptr->gamma_from_1[w];
}
else
{
palette[i].red = png_ptr->gamma_table[palette[i].red];
palette[i].green = png_ptr->gamma_table[palette[i].green];
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
}
}
}
else
{
int i;
for (i = 0; i < num_palette; i++)
{
if (palette[i].red == (png_byte)png_ptr->trans_values.gray)
{
palette[i] = back;
}
else
{
palette[i].red = png_ptr->gamma_table[palette[i].red];
palette[i].green = png_ptr->gamma_table[palette[i].green];
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
}
}
}
}
else
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
if (png_ptr->transformations & PNG_GAMMA)
{
int i;
for (i = 0; i < num_palette; i++)
{
palette[i].red = png_ptr->gamma_table[palette[i].red];
palette[i].green = png_ptr->gamma_table[palette[i].green];
palette[i].blue = png_ptr->gamma_table[palette[i].blue];
}
}
#ifdef PNG_READ_BACKGROUND_SUPPORTED
else
#endif
#endif
#ifdef PNG_READ_BACKGROUND_SUPPORTED
if (png_ptr->transformations & PNG_BACKGROUND)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_color back;
back.red = (png_byte)png_ptr->background.red;
back.green = (png_byte)png_ptr->background.green;
back.blue = (png_byte)png_ptr->background.blue;
for (i = 0; i < (int)png_ptr->num_trans; i++)
{
if (png_ptr->trans[i] == 0)
{
palette[i].red = back.red;
palette[i].green = back.green;
palette[i].blue = back.blue;
}
else if (png_ptr->trans[i] != 0xff)
{
png_composite(palette[i].red, png_ptr->palette[i].red,
png_ptr->trans[i], back.red);
png_composite(palette[i].green, png_ptr->palette[i].green,
png_ptr->trans[i], back.green);
png_composite(palette[i].blue, png_ptr->palette[i].blue,
png_ptr->trans[i], back.blue);
}
}
}
else /* Assume grayscale palette (what else could it be?) */
{
int i;
for (i = 0; i < num_palette; i++)
{
if (i == (png_byte)png_ptr->trans_values.gray)
{
palette[i].red = (png_byte)png_ptr->background.red;
palette[i].green = (png_byte)png_ptr->background.green;
palette[i].blue = (png_byte)png_ptr->background.blue;
}
}
}
}
#endif
}
#endif
#ifdef PNG_READ_BACKGROUND_SUPPORTED
/* Replace any alpha or transparency with the supplied background color.
@@ -2784,7 +2650,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette,
*/
void /* PRIVATE */
png_do_background(png_row_infop row_info, png_bytep row,
png_color_16p trans_values, png_color_16p background
png_color_16p trans_color, png_color_16p background
#ifdef PNG_READ_GAMMA_SUPPORTED
, png_color_16p background_1,
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
@@ -2801,11 +2667,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_background");
if (background != NULL &&
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
(!(row_info->color_type & PNG_COLOR_MASK_ALPHA) ||
(row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_values)))
(row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color)))
{
switch (row_info->color_type)
{
@@ -2820,7 +2683,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x01)
== trans_values->gray)
== trans_color->gray)
{
*sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
*sp |= (png_byte)(background->gray << shift);
@@ -2846,7 +2709,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
== trans_color->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*sp |= (png_byte)(background->gray << shift);
@@ -2876,7 +2739,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
== trans_color->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*sp |= (png_byte)(background->gray << shift);
@@ -2903,7 +2766,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
== trans_color->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
*sp |= (png_byte)(background->gray << shift);
@@ -2933,7 +2796,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
== trans_color->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
*sp |= (png_byte)(background->gray << shift);
@@ -2958,7 +2821,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
sp = row;
for (i = 0; i < row_width; i++, sp++)
{
if (*sp == trans_values->gray)
if (*sp == trans_color->gray)
{
*sp = (png_byte)background->gray;
}
@@ -2974,7 +2837,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
sp = row;
for (i = 0; i < row_width; i++, sp++)
{
if (*sp == trans_values->gray)
if (*sp == trans_color->gray)
{
*sp = (png_byte)background->gray;
}
@@ -2994,7 +2857,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
png_uint_16 v;
v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
if (v == trans_values->gray)
if (v == trans_color->gray)
{
/* Background is already in screen gamma */
*sp = (png_byte)((background->gray >> 8) & 0xff);
@@ -3017,7 +2880,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
png_uint_16 v;
v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
if (v == trans_values->gray)
if (v == trans_color->gray)
{
*sp = (png_byte)((background->gray >> 8) & 0xff);
*(sp + 1) = (png_byte)(background->gray & 0xff);
@@ -3040,9 +2903,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
sp = row;
for (i = 0; i < row_width; i++, sp += 3)
{
if (*sp == trans_values->red &&
*(sp + 1) == trans_values->green &&
*(sp + 2) == trans_values->blue)
if (*sp == trans_color->red &&
*(sp + 1) == trans_color->green &&
*(sp + 2) == trans_color->blue)
{
*sp = (png_byte)background->red;
*(sp + 1) = (png_byte)background->green;
@@ -3062,9 +2925,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
sp = row;
for (i = 0; i < row_width; i++, sp += 3)
{
if (*sp == trans_values->red &&
*(sp + 1) == trans_values->green &&
*(sp + 2) == trans_values->blue)
if (*sp == trans_color->red &&
*(sp + 1) == trans_color->green &&
*(sp + 2) == trans_color->blue)
{
*sp = (png_byte)background->red;
*(sp + 1) = (png_byte)background->green;
@@ -3084,8 +2947,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
if (r == trans_values->red && g == trans_values->green &&
b == trans_values->blue)
if (r == trans_color->red && g == trans_color->green &&
b == trans_color->blue)
{
/* Background is already in screen gamma */
*sp = (png_byte)((background->red >> 8) & 0xff);
@@ -3119,8 +2982,8 @@ png_do_background(png_row_infop row_info, png_bytep row,
png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
if (r == trans_values->red && g == trans_values->green &&
b == trans_values->blue)
if (r == trans_color->red && g == trans_color->green &&
b == trans_color->blue)
{
*sp = (png_byte)((background->red >> 8) & 0xff);
*(sp + 1) = (png_byte)(background->red & 0xff);
@@ -3491,9 +3354,6 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_gamma");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
((row_info->bit_depth <= 8 && gamma_table != NULL) ||
(row_info->bit_depth == 16 && gamma_16_table != NULL)))
{
@@ -3670,7 +3530,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
*/
void /* PRIVATE */
png_do_expand_palette(png_row_infop row_info, png_bytep row,
png_colorp palette, png_bytep trans, int num_trans)
png_colorp palette, png_bytep trans_alpha, int num_trans)
{
int shift, value;
png_bytep sp, dp;
@@ -3680,9 +3540,6 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_expand_palette");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
row_info->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (row_info->bit_depth < 8)
@@ -3765,7 +3622,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
{
case 8:
{
if (trans != NULL)
if (trans_alpha != NULL)
{
sp = row + (png_size_t)row_width - 1;
dp = row + (png_size_t)(row_width << 2) - 1;
@@ -3775,7 +3632,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
if ((int)(*sp) >= num_trans)
*dp-- = 0xff;
else
*dp-- = trans[*sp];
*dp-- = trans_alpha[*sp];
*dp-- = palette[*sp].blue;
*dp-- = palette[*sp].green;
*dp-- = palette[*sp].red;
@@ -3826,9 +3683,6 @@ png_do_expand(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_expand");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL)
#endif
{
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
@@ -4038,9 +3892,6 @@ png_do_dither(png_row_infop row_info, png_bytep row,
png_debug(1, "in png_do_dither");
#ifdef PNG_USELESS_TESTS_SUPPORTED
if (row != NULL && row_info != NULL)
#endif
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
palette_lookup && row_info->bit_depth == 8)
@@ -4140,6 +3991,7 @@ static PNG_CONST int png_gamma_shift[] =
* AND
* {
* the screen_gamma is known
*
* OR
*
* RGB_to_gray transformation is being performed
@@ -4385,9 +4237,6 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
png_debug(1, "in png_do_read_intrapixel");
if (
#ifdef PNG_USELESS_TESTS_SUPPORTED
row != NULL && row_info != NULL &&
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
int bytes_per_pixel;