/* pngrtran.c - transforms the data in a row for PNG readers
*
* Last changed in libpng 1.6.4 [August 21, 2013]
* Copyright (c) 1998-2013 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.)
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* This file contains functions optionally called by an application
* in order to tell libpng how to handle data when reading a PNG.
* Transformations that are used in both reading and writing are
* in pngtrans.c.
*/
#include "pngpriv.h"
#ifdef PNG_READ_SUPPORTED
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
void PNGAPI
png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action)
{
png_debug(1, "in png_set_crc_action");
if (png_ptr == NULL)
return;
/* Tell libpng how we react to CRC errors in critical chunks */
switch (crit_action)
{
case PNG_CRC_NO_CHANGE: /* Leave setting as is */
break;
case PNG_CRC_WARN_USE: /* Warn/use data */
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
break;
case PNG_CRC_QUIET_USE: /* Quiet/use data */
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
PNG_FLAG_CRC_CRITICAL_IGNORE;
break;
case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */
png_warning(png_ptr,
"Can't discard critical data on CRC error");
case PNG_CRC_ERROR_QUIT: /* Error/quit */
case PNG_CRC_DEFAULT:
default:
png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
break;
}
/* Tell libpng how we react to CRC errors in ancillary chunks */
switch (ancil_action)
{
case PNG_CRC_NO_CHANGE: /* Leave setting as is */
break;
case PNG_CRC_WARN_USE: /* Warn/use data */
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
break;
case PNG_CRC_QUIET_USE: /* Quiet/use data */
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
PNG_FLAG_CRC_ANCILLARY_NOWARN;
break;
case PNG_CRC_ERROR_QUIT: /* Error/quit */
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
break;
case PNG_CRC_WARN_DISCARD: /* Warn/discard data */
case PNG_CRC_DEFAULT:
default:
png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
break;
}
}
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
/* Is it OK to set a transformation now? Only if png_start_read_image or
* png_read_update_info have not been called. It is not necessary for the IHDR
* to have been read in all cases, the parameter allows for this check too.
*/
static int
png_rtran_ok(png_structrp png_ptr, int need_IHDR)
{
if (png_ptr != NULL)
{
if (png_ptr->flags & PNG_FLAG_ROW_INIT)
png_app_error(png_ptr,
"invalid after png_start_read_image or png_read_update_info");
else if (need_IHDR && (png_ptr->mode & PNG_HAVE_IHDR) == 0)
png_app_error(png_ptr, "invalid before the PNG header has been read");
else
{
/* Turn on failure to initialize correctly for all transforms. */
png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED;
return 1; /* Ok */
}
}
return 0; /* no png_error possible! */
}
#endif
#ifdef PNG_READ_BACKGROUND_SUPPORTED
/* Handle alpha and tRNS via a background color */
void PNGFAPI
png_set_background_fixed(png_structrp png_ptr,
png_const_color_16p background_color, int background_gamma_code,
int need_expand, png_fixed_point background_gamma)
{
png_debug(1, "in png_set_background_fixed");
if (!png_rtran_ok(png_ptr, 0) || background_color == NULL)
return;
if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
{
png_warning(png_ptr, "Application must supply a known background gamma");
return;
}
png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA;
png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
png_ptr->background = *background_color;
png_ptr->background_gamma = background_gamma;
png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
if (need_expand)
png_ptr->transformations |= PNG_BACKGROUND_EXPAND;
else
png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND;
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
void PNGAPI
png_set_background(png_structrp png_ptr,
png_const_color_16p background_color, int background_gamma_code,
int need_expand, double background_gamma)
{
png_set_background_fixed(png_ptr, background_color, background_gamma_code,
need_expand, png_fixed(png_ptr, background_gamma, "png_set_background"));
}
# endif /* FLOATING_POINT */
#endif /* READ_BACKGROUND */
/* Scale 16-bit depth files to 8-bit depth. If both of these are set then the
* one that pngrtran does first (scale) happens. This is necessary to allow the
* TRANSFORM and API behavior to be somewhat consistent, and it's simpler.
*/
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
void PNGAPI
png_set_scale_16(png_structrp png_ptr)
{
png_debug(1, "in png_set_scale_16");
if (!png_rtran_ok(png_ptr, 0))
return;
png_ptr->transformations |= PNG_SCALE_16_TO_8;
}
#endif
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
/* Chop 16-bit depth files to 8-bit depth */
void PNGAPI
png_set_strip_16(png_structrp png_ptr)
{
png_debug(1, "in png_set_strip_16");
if (!png_rtran_ok(png_ptr, 0))
return;
png_ptr->transformations |= PNG_16_TO_8;
}
#endif
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
void PNGAPI
png_set_strip_alpha(png_structrp png_ptr)
{
png_debug(1, "in png_set_strip_alpha");
if (!png_rtran_ok(png_ptr, 0))
return;
png_ptr->transformations |= PNG_STRIP_ALPHA;
}
#endif
#if defined(PNG_READ_ALPHA_MODE_SUPPORTED) || defined(PNG_READ_GAMMA_SUPPORTED)
static png_fixed_point
translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
int is_screen)
{
/* Check for flag values. The main reason for having the old Mac value as a
* flag is that it is pretty near impossible to work out what the correct
* value is from Apple documentation - a working Mac system is needed to
* discover the value!
*/
if (output_gamma == PNG_DEFAULT_sRGB ||
output_gamma == PNG_FP_1 / PNG_DEFAULT_sRGB)
{
/* If there is no sRGB support this just sets the gamma to the standard
* sRGB value. (This is a side effect of using this function!)
*/
# ifdef PNG_READ_sRGB_SUPPORTED
png_ptr->flags |= PNG_FLAG_ASSUME_sRGB;
# else
PNG_UNUSED(png_ptr)
# endif
if (is_screen)
output_gamma = PNG_GAMMA_sRGB;
else
output_gamma = PNG_GAMMA_sRGB_INVERSE;
}
else if (output_gamma == PNG_GAMMA_MAC_18 ||
output_gamma == PNG_FP_1 / PNG_GAMMA_MAC_18)
{
if (is_screen)
output_gamma = PNG_GAMMA_MAC_OLD;
else
output_gamma = PNG_GAMMA_MAC_INVERSE;
}
return output_gamma;
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
static png_fixed_point
convert_gamma_value(png_structrp png_ptr, double output_gamma)
{
/* The following silently ignores cases where fixed point (times 100,000)
* gamma values are passed to the floating point API. This is safe and it
* means the fix
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头发模拟演示_C++_C_下载.zip (2783个子文件)
add_python_module 4KB
compile_dlib_python_module.bat 102B
.buildinfo 230B
pngrtran.c 167KB
png.c 145KB
pngrutil.c 138KB
pngread.c 130KB
pngwutil.c 87KB
pngwrite.c 72KB
deflate.c 70KB
inflate.c 52KB
pngset.c 46KB
trees.c 43KB
pngpread.c 35KB
pngget.c 32KB
pngerror.c 28KB
pngtrans.c 24KB
infback.c 22KB
gzread.c 18KB
pngwtran.c 17KB
gzlib.c 16KB
gzwrite.c 16KB
inffast.c 13KB
crc32.c 13KB
inftrees.c 13KB
pngmem.c 8KB
zutil.c 7KB
pngwio.c 5KB
adler32.c 5KB
pngrio.c 4KB
compress.c 2KB
uncompr.c 2KB
gzclose.c 678B
cassert 45B
cassert 42B
cmake 3KB
CMLConfig.cmake 2KB
FindOpenCL.cmake 1KB
FindDLIB.cmake 798B
FindCML.cmake 790B
UseCML.cmake 612B
widgets.cpp 200KB
base_widgets.cpp 94KB
gui_core_kernel_1.cpp 77KB
gui_core_kernel_2.cpp 73KB
to_xml.cpp 56KB
image.cpp 54KB
bigint_kernel_2.cpp 52KB
jquant2.cpp 47KB
fhog.cpp 47KB
bigint_kernel_1.cpp 45KB
optimization.cpp 41KB
matrix.cpp 41KB
object_detector.cpp 41KB
jdmarker.cpp 40KB
jmemmgr.cpp 40KB
graph_cuts.cpp 37KB
bayes_net_gui_ex.cpp 36KB
matrix2.cpp 34KB
matrix3.cpp 34KB
matrix4.cpp 34KB
sequence_segmenter.cpp 31KB
style.cpp 31KB
jquant1.cpp 31KB
sockets_kernel_2.cpp 30KB
serialize.cpp 29KB
ElasticRod2.cpp 29KB
svm.cpp 28KB
sockets_kernel_1.cpp 27KB
ElasticRod.cpp 27KB
scan_image.cpp 25KB
fonts.cpp 25KB
jdcoefct.cpp 25KB
statistics.cpp 24KB
http_client.cpp 24KB
geometry.cpp 23KB
simple.cpp 23KB
kcentroid.cpp 22KB
svm_struct.cpp 22KB
find_max_factor_graph_nmplp.cpp 22KB
object_detection.cpp 21KB
htmlify.cpp 21KB
svm_struct_ex.cpp 21KB
main.cpp 21KB
empirical_kernel_map.cpp 21KB
jdhuff.cpp 20KB
jdphuff.cpp 20KB
jdmainct.cpp 20KB
main.cpp 20KB
jdmaster.cpp 19KB
pipe.cpp 19KB
md5_kernel_1.cpp 19KB
hash_table.cpp 19KB
lz77_buffer.cpp 18KB
train_object_detector.cpp 18KB
directed_graph.cpp 18KB
array.cpp 18KB
bsp.cpp 18KB
matrix_expressions_ex.cpp 17KB
array2d.cpp 17KB
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