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Bug 1918554 - Apply mozilla patches for libpng r=tnikkel

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Differential Revision: https://phabricator.services.mozilla.com/D222057
This commit is contained in:
Updatebot 2024-09-13 23:22:50 +00:00
parent 9e242a993a
commit b714fddf2c
13 changed files with 1234 additions and 1 deletions
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2
media/libpng/arm/arm_init.c
View File

@ -41,7 +41,7 @@
/* ARM Neon is expected to be available on the target CPU architecture. */
# error "PNG_ARM_NEON_CHECK_SUPPORTED must not be defined on this CPU arch"
# elif defined(__linux__)
# define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c"
# define PNG_ARM_NEON_FILE "linux.c"
# else
# error "No support for run-time ARM Neon checking; use compile-time options"
# endif

6
media/libpng/arm/filter_neon.S
View File

@ -27,6 +27,12 @@
* will be raised otherwise.
*/
/* These are required because Mozilla's moz.build system doesn't pass
* -DDefined macros to the assembler.
*/
#define PNG_READ_SUPPORTED
#define MOZ_PNG_HAVE_ARM_NEON
/* This is required to get the symbol renames, which are #defines, and the
* definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
*/

96
media/libpng/png.h
View File

@ -329,6 +329,10 @@
# include "pnglibconf.h"
#endif
#define PNG_APNG_SUPPORTED
#define PNG_READ_APNG_SUPPORTED
#define PNG_WRITE_APNG_SUPPORTED
#ifndef PNG_VERSION_INFO_ONLY
/* Machine specific configuration. */
# include "pngconf.h"
@ -424,6 +428,17 @@ extern "C" {
* See pngconf.h for base types that vary by machine/system
*/
#ifdef PNG_APNG_SUPPORTED
/* dispose_op flags from inside fcTL */
#define PNG_DISPOSE_OP_NONE 0x00
#define PNG_DISPOSE_OP_BACKGROUND 0x01
#define PNG_DISPOSE_OP_PREVIOUS 0x02
/* blend_op flags from inside fcTL */
#define PNG_BLEND_OP_SOURCE 0x00
#define PNG_BLEND_OP_OVER 0x01
#endif /* APNG */
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
@ -745,6 +760,10 @@ typedef png_unknown_chunk * * png_unknown_chunkpp;
#define PNG_INFO_sCAL 0x4000U /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000U /* ESR, 1.0.6 */
#define PNG_INFO_eXIf 0x10000U /* GR-P, 1.6.31 */
#ifdef PNG_APNG_SUPPORTED
#define PNG_INFO_acTL 0x20000U
#define PNG_INFO_fcTL 0x40000U
#endif
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@ -782,6 +801,10 @@ typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
#ifdef PNG_APNG_SUPPORTED
typedef PNG_CALLBACK(void, *png_progressive_frame_ptr, (png_structp,
png_uint_32));
#endif
/* The following callback receives png_uint_32 row_number, int pass for the
* png_bytep data of the row. When transforming an interlaced image the
@ -3230,6 +3253,75 @@ PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
* END OF HARDWARE AND SOFTWARE OPTIONS
******************************************************************************/
#ifdef PNG_APNG_SUPPORTED
PNG_EXPORT(248, png_uint_32, png_get_acTL, (png_structp png_ptr,
png_infop info_ptr, png_uint_32 *num_frames, png_uint_32 *num_plays));
PNG_EXPORT(249, png_uint_32, png_set_acTL, (png_structp png_ptr,
png_infop info_ptr, png_uint_32 num_frames, png_uint_32 num_plays));
PNG_EXPORT(250, png_uint_32, png_get_num_frames, (png_structp png_ptr,
png_infop info_ptr));
PNG_EXPORT(251, png_uint_32, png_get_num_plays, (png_structp png_ptr,
png_infop info_ptr));
PNG_EXPORT(252, png_uint_32, png_get_next_frame_fcTL,
(png_structp png_ptr, png_infop info_ptr, png_uint_32 *width,
png_uint_32 *height, png_uint_32 *x_offset, png_uint_32 *y_offset,
png_uint_16 *delay_num, png_uint_16 *delay_den, png_byte *dispose_op,
png_byte *blend_op));
PNG_EXPORT(253, png_uint_32, png_set_next_frame_fcTL,
(png_structp png_ptr, png_infop info_ptr, png_uint_32 width,
png_uint_32 height, png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
png_byte blend_op));
PNG_EXPORT(254, png_uint_32, png_get_next_frame_width,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(255, png_uint_32, png_get_next_frame_height,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(256, png_uint_32, png_get_next_frame_x_offset,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(257, png_uint_32, png_get_next_frame_y_offset,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(258, png_uint_16, png_get_next_frame_delay_num,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(259, png_uint_16, png_get_next_frame_delay_den,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(260, png_byte, png_get_next_frame_dispose_op,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(261, png_byte, png_get_next_frame_blend_op,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(262, png_byte, png_get_first_frame_is_hidden,
(png_structp png_ptr, png_infop info_ptr));
PNG_EXPORT(263, png_uint_32, png_set_first_frame_is_hidden,
(png_structp png_ptr, png_infop info_ptr, png_byte is_hidden));
#ifdef PNG_READ_APNG_SUPPORTED
PNG_EXPORT(264, void, png_read_frame_head, (png_structp png_ptr,
png_infop info_ptr));
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
PNG_EXPORT(265, void, png_set_progressive_frame_fn, (png_structp png_ptr,
png_progressive_frame_ptr frame_info_fn,
png_progressive_frame_ptr frame_end_fn));
#endif /* PROGRESSIVE_READ */
#endif /* READ_APNG */
#ifdef PNG_WRITE_APNG_SUPPORTED
PNG_EXPORT(266, void, png_write_frame_head, (png_structp png_ptr,
png_infop info_ptr, png_bytepp row_pointers,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
png_byte blend_op));
PNG_EXPORT(267, void, png_write_frame_tail, (png_structp png_ptr,
png_infop info_ptr));
#endif /* WRITE_APNG */
#endif /* APNG */
/* Maintainer: Put new public prototypes here ^, in libpng.3, in project
* defs, and in scripts/symbols.def.
*/
@ -3238,7 +3330,11 @@ PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
* one to use is one more than this.)
*/
#ifdef PNG_EXPORT_LAST_ORDINAL
#ifdef PNG_APNG_SUPPORTED
PNG_EXPORT_LAST_ORDINAL(269);
#else
PNG_EXPORT_LAST_ORDINAL(249);
#endif /* APNG */
#endif
#ifdef __cplusplus

162
media/libpng/pngget.c
View File

@ -1264,4 +1264,166 @@ png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
# endif
#endif
#ifdef PNG_APNG_SUPPORTED
png_uint_32 PNGAPI
png_get_acTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *num_frames, png_uint_32 *num_plays)
{
png_debug1(1, "in %s retrieval function", "acTL");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_acTL) != 0 &&
num_frames != NULL && num_plays != NULL)
{
*num_frames = info_ptr->num_frames;
*num_plays = info_ptr->num_plays;
return (1);
}
return (0);
}
png_uint_32 PNGAPI
png_get_num_frames(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_num_frames()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->num_frames);
return (0);
}
png_uint_32 PNGAPI
png_get_num_plays(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_num_plays()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->num_plays);
return (0);
}
png_uint_32 PNGAPI
png_get_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *width, png_uint_32 *height,
png_uint_32 *x_offset, png_uint_32 *y_offset,
png_uint_16 *delay_num, png_uint_16 *delay_den,
png_byte *dispose_op, png_byte *blend_op)
{
png_debug1(1, "in %s retrieval function", "fcTL");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_fcTL) != 0 &&
width != NULL && height != NULL &&
x_offset != NULL && y_offset != NULL &&
delay_num != NULL && delay_den != NULL &&
dispose_op != NULL && blend_op != NULL)
{
*width = info_ptr->next_frame_width;
*height = info_ptr->next_frame_height;
*x_offset = info_ptr->next_frame_x_offset;
*y_offset = info_ptr->next_frame_y_offset;
*delay_num = info_ptr->next_frame_delay_num;
*delay_den = info_ptr->next_frame_delay_den;
*dispose_op = info_ptr->next_frame_dispose_op;
*blend_op = info_ptr->next_frame_blend_op;
return (1);
}
return (0);
}
png_uint_32 PNGAPI
png_get_next_frame_width(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_width()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_width);
return (0);
}
png_uint_32 PNGAPI
png_get_next_frame_height(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_height()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_height);
return (0);
}
png_uint_32 PNGAPI
png_get_next_frame_x_offset(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_x_offset()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_x_offset);
return (0);
}
png_uint_32 PNGAPI
png_get_next_frame_y_offset(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_y_offset()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_y_offset);
return (0);
}
png_uint_16 PNGAPI
png_get_next_frame_delay_num(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_delay_num()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_delay_num);
return (0);
}
png_uint_16 PNGAPI
png_get_next_frame_delay_den(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_delay_den()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_delay_den);
return (0);
}
png_byte PNGAPI
png_get_next_frame_dispose_op(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_dispose_op()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_dispose_op);
return (0);
}
png_byte PNGAPI
png_get_next_frame_blend_op(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_get_next_frame_blend_op()");
if (png_ptr != NULL && info_ptr != NULL)
return (info_ptr->next_frame_blend_op);
return (0);
}
png_byte PNGAPI
png_get_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_first_frame_is_hidden()");
if (png_ptr != NULL)
return (png_byte)(png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN);
PNG_UNUSED(info_ptr)
return 0;
}
#endif /* APNG */
#endif /* READ || WRITE */

13
media/libpng/pnginfo.h
View File

@ -263,5 +263,18 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
png_bytepp row_pointers; /* the image bits */
#endif
#ifdef PNG_APNG_SUPPORTED
png_uint_32 num_frames; /* including default image */
png_uint_32 num_plays;
png_uint_32 next_frame_width;
png_uint_32 next_frame_height;
png_uint_32 next_frame_x_offset;
png_uint_32 next_frame_y_offset;
png_uint_16 next_frame_delay_num;
png_uint_16 next_frame_delay_den;
png_byte next_frame_dispose_op;
png_byte next_frame_blend_op;
#endif
};
#endif /* PNGINFO_H */

169
media/libpng/pngpread.c
View File

@ -195,6 +195,89 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
chunk_name = png_ptr->chunk_name;
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->num_frames_read > 0 &&
png_ptr->num_frames_read < info_ptr->num_frames)
{
if (chunk_name == png_IDAT)
{
/* Discard trailing IDATs for the first frame */
if ((png_ptr->mode & PNG_HAVE_fcTL) != 0 ||
png_ptr->num_frames_read > 1)
png_error(png_ptr, "out of place IDAT");
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_crc_finish(png_ptr, png_ptr->push_length);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
else if (chunk_name == png_fdAT)
{
PNG_PUSH_SAVE_BUFFER_IF_LT(4)
png_ensure_sequence_number(png_ptr, 4);
if ((png_ptr->mode & PNG_HAVE_fcTL) == 0)
{
/* Discard trailing fdATs for frames other than the first */
if (png_ptr->num_frames_read < 2)
png_error(png_ptr, "out of place fdAT");
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_crc_finish(png_ptr, png_ptr->push_length);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
else
{
/* frame data follows */
png_ptr->idat_size = png_ptr->push_length - 4;
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
}
}
else if (chunk_name == png_fcTL)
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_read_reset(png_ptr);
png_ptr->mode &= ~PNG_HAVE_fcTL;
png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length);
if ((png_ptr->mode & PNG_HAVE_fcTL) == 0)
png_error(png_ptr, "missing required fcTL chunk");
png_read_reinit(png_ptr, info_ptr);
png_progressive_read_reset(png_ptr);
if (png_ptr->frame_info_fn != NULL)
(*(png_ptr->frame_info_fn))(png_ptr, png_ptr->num_frames_read);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
else if (chunk_name == png_IEND)
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_warning(png_ptr, "Number of actual frames fewer than expected");
png_crc_finish(png_ptr, png_ptr->push_length);
png_ptr->process_mode = PNG_READ_DONE_MODE;
png_push_have_end(png_ptr, info_ptr);
}
else
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_warning(png_ptr, "Skipped (ignored) a chunk "
"between APNG chunks");
png_crc_finish(png_ptr, png_ptr->push_length);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
return;
}
#endif /* READ_APNG */
if (chunk_name == png_IDAT)
{
if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
@ -261,6 +344,9 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
else if (chunk_name == png_IDAT)
{
#ifdef PNG_READ_APNG_SUPPORTED
png_have_info(png_ptr, info_ptr);
#endif
png_ptr->idat_size = png_ptr->push_length;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
png_push_have_info(png_ptr, info_ptr);
@ -415,6 +501,20 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
}
#endif
#ifdef PNG_READ_APNG_SUPPORTED
else if (chunk_name == png_acTL)
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_handle_acTL(png_ptr, info_ptr, png_ptr->push_length);
}
else if (chunk_name == png_fcTL)
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif /* READ_APNG */
else
{
PNG_PUSH_SAVE_BUFFER_IF_FULL
@ -547,7 +647,11 @@ png_push_read_IDAT(png_structrp png_ptr)
png_byte chunk_tag[4];
/* TODO: this code can be commoned up with the same code in push_read */
#ifdef PNG_READ_APNG_SUPPORTED
PNG_PUSH_SAVE_BUFFER_IF_LT(12)
#else
PNG_PUSH_SAVE_BUFFER_IF_LT(8)
#endif
png_push_fill_buffer(png_ptr, chunk_length, 4);
png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
png_reset_crc(png_ptr);
@ -555,17 +659,60 @@ png_push_read_IDAT(png_structrp png_ptr)
png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->chunk_name != png_fdAT && png_ptr->num_frames_read > 0)
{
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) != 0)
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
if (png_ptr->frame_end_fn != NULL)
(*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read);
png_ptr->num_frames_read++;
return;
}
else
{
if (png_ptr->chunk_name == png_IEND)
png_error(png_ptr, "Not enough image data");
PNG_PUSH_SAVE_BUFFER_IF_FULL
png_warning(png_ptr, "Skipping (ignoring) a chunk between "
"APNG chunks");
png_crc_finish(png_ptr, png_ptr->push_length);
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
return;
}
}
else
#endif
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->chunk_name != png_IDAT && png_ptr->num_frames_read == 0)
#else
if (png_ptr->chunk_name != png_IDAT)
#endif
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
png_error(png_ptr, "Not enough compressed data");
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->frame_end_fn != NULL)
(*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read);
png_ptr->num_frames_read++;
#endif
return;
}
png_ptr->idat_size = png_ptr->push_length;
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->num_frames_read > 0)
{
png_ensure_sequence_number(png_ptr, 4);
png_ptr->idat_size -= 4;
}
#endif
}
if (png_ptr->idat_size != 0 && png_ptr->save_buffer_size != 0)
@ -639,6 +786,16 @@ png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer,
if (!(buffer_length > 0) || buffer == NULL)
png_error(png_ptr, "No IDAT data (internal error)");
#ifdef PNG_READ_APNG_SUPPORTED
/* If the app is not APNG-aware, decode only the first frame */
if ((png_ptr->apng_flags & PNG_APNG_APP) == 0 &&
png_ptr->num_frames_read > 0)
{
png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
return;
}
#endif
/* This routine must process all the data it has been given
* before returning, calling the row callback as required to
* handle the uncompressed results.
@ -1093,6 +1250,18 @@ png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr,
png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
}
#ifdef PNG_READ_APNG_SUPPORTED
void PNGAPI
png_set_progressive_frame_fn(png_structp png_ptr,
png_progressive_frame_ptr frame_info_fn,
png_progressive_frame_ptr frame_end_fn)
{
png_ptr->frame_info_fn = frame_info_fn;
png_ptr->frame_end_fn = frame_end_fn;
png_ptr->apng_flags |= PNG_APNG_APP;
}
#endif
png_voidp PNGAPI
png_get_progressive_ptr(png_const_structrp png_ptr)
{

57
media/libpng/pngpriv.h
View File

@ -621,6 +621,10 @@
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
#define PNG_WROTE_eXIf 0x4000U
#define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
#ifdef PNG_APNG_SUPPORTED
#define PNG_HAVE_acTL 0x10000U
#define PNG_HAVE_fcTL 0x20000U
#endif
/* Flags for the transformations the PNG library does on the image data */
#define PNG_BGR 0x0001U
@ -857,6 +861,16 @@
#define png_tRNS PNG_U32(116, 82, 78, 83)
#define png_zTXt PNG_U32(122, 84, 88, 116)
#ifdef PNG_APNG_SUPPORTED
#define png_acTL PNG_U32( 97, 99, 84, 76)
#define png_fcTL PNG_U32(102, 99, 84, 76)
#define png_fdAT PNG_U32(102, 100, 65, 84)
/* For png_struct.apng_flags: */
#define PNG_FIRST_FRAME_HIDDEN 0x0001U
#define PNG_APNG_APP 0x0002U
#endif
/* The following will work on (signed char*) strings, whereas the get_uint_32
* macro will fail on top-bit-set values because of the sign extension.
*/
@ -1642,6 +1656,49 @@ PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
#endif /* PROGRESSIVE_READ */
#ifdef PNG_APNG_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_ensure_fcTL_is_valid,(png_structp png_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op),PNG_EMPTY);
#ifdef PNG_READ_APNG_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_handle_acTL,(png_structp png_ptr,
png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_handle_fcTL,(png_structp png_ptr,
png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_handle_fdAT,(png_structp png_ptr,
png_infop info_ptr, png_uint_32 length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_have_info,(png_structp png_ptr,
png_infop info_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_ensure_sequence_number,(png_structp png_ptr,
png_uint_32 length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_reset,(png_structp png_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_read_reinit,(png_structp png_ptr,
png_infop info_ptr),PNG_EMPTY);
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_progressive_read_reset,(png_structp png_ptr),
PNG_EMPTY);
#endif /* PROGRESSIVE_READ */
#endif /* READ_APNG */
#ifdef PNG_WRITE_APNG_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_write_acTL,(png_structp png_ptr,
png_uint_32 num_frames, png_uint_32 num_plays),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_write_fcTL,(png_structp png_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_write_fdAT,(png_structp png_ptr,
png_const_bytep data, png_size_t length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_write_reset,(png_structp png_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_write_reinit,(png_structp png_ptr,
png_infop info_ptr, png_uint_32 width, png_uint_32 height),PNG_EMPTY);
#endif /* WRITE_APNG */
#endif /* APNG */
/* Added at libpng version 1.6.0 */
#ifdef PNG_GAMMA_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,

80
media/libpng/pngread.c
View File

@ -161,6 +161,9 @@ png_read_info(png_structrp png_ptr, png_inforp info_ptr)
else if (chunk_name == png_IDAT)
{
#ifdef PNG_READ_APNG_SUPPORTED
png_have_info(png_ptr, info_ptr);
#endif
png_ptr->idat_size = length;
break;
}
@ -255,6 +258,17 @@ png_read_info(png_structrp png_ptr, png_inforp info_ptr)
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
#ifdef PNG_READ_APNG_SUPPORTED
else if (chunk_name == png_acTL)
png_handle_acTL(png_ptr, info_ptr, length);
else if (chunk_name == png_fcTL)
png_handle_fcTL(png_ptr, info_ptr, length);
else if (chunk_name == png_fdAT)
png_handle_fdAT(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length,
PNG_HANDLE_CHUNK_AS_DEFAULT);
@ -262,6 +276,72 @@ png_read_info(png_structrp png_ptr, png_inforp info_ptr)
}
#endif /* SEQUENTIAL_READ */
#ifdef PNG_READ_APNG_SUPPORTED
void PNGAPI
png_read_frame_head(png_structp png_ptr, png_infop info_ptr)
{
png_byte have_chunk_after_DAT; /* after IDAT or after fdAT */
png_debug(0, "Reading frame head");
if ((png_ptr->mode & PNG_HAVE_acTL) == 0)
png_error(png_ptr, "attempt to png_read_frame_head() but "
"no acTL present");
/* do nothing for the main IDAT */
if (png_ptr->num_frames_read == 0)
return;
png_read_reset(png_ptr);
png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
png_ptr->mode &= ~PNG_HAVE_fcTL;
have_chunk_after_DAT = 0;
for (;;)
{
png_uint_32 length = png_read_chunk_header(png_ptr);
if (png_ptr->chunk_name == png_IDAT)
{
/* discard trailing IDATs for the first frame */
if (have_chunk_after_DAT != 0 || png_ptr->num_frames_read > 1)
png_error(png_ptr, "png_read_frame_head(): out of place IDAT");
png_crc_finish(png_ptr, length);
}
else if (png_ptr->chunk_name == png_fcTL)
{
png_handle_fcTL(png_ptr, info_ptr, length);
have_chunk_after_DAT = 1;
}
else if (png_ptr->chunk_name == png_fdAT)
{
png_ensure_sequence_number(png_ptr, length);
/* discard trailing fdATs for frames other than the first */
if (have_chunk_after_DAT == 0 && png_ptr->num_frames_read > 1)
png_crc_finish(png_ptr, length - 4);
else if (png_ptr->mode & PNG_HAVE_fcTL)
{
png_ptr->idat_size = length - 4;
png_ptr->mode |= PNG_HAVE_IDAT;
break;
}
else
png_error(png_ptr, "png_read_frame_head(): out of place fdAT");
}
else
{
png_warning(png_ptr, "Skipped (ignored) a chunk "
"between APNG chunks");
png_crc_finish(png_ptr, length);
}
}
}
#endif /* READ_APNG */
/* Optional call to update the users info_ptr structure */
void PNGAPI
png_read_update_info(png_structrp png_ptr, png_inforp info_ptr)

295
media/libpng/pngrutil.c
View File

@ -863,6 +863,11 @@ png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
filter_type = buf[11];
interlace_type = buf[12];
#ifdef PNG_READ_APNG_SUPPORTED
png_ptr->first_frame_width = width;
png_ptr->first_frame_height = height;
#endif
/* Set internal variables */
png_ptr->width = width;
png_ptr->height = height;
@ -2857,6 +2862,180 @@ png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
}
#endif
#ifdef PNG_READ_APNG_SUPPORTED
void /* PRIVATE */
png_handle_acTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte data[8];
png_uint_32 num_frames;
png_uint_32 num_plays;
png_uint_32 didSet;
png_debug(1, "in png_handle_acTL");
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
{
png_error(png_ptr, "Missing IHDR before acTL");
}
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
png_warning(png_ptr, "Invalid acTL after IDAT skipped");
png_crc_finish(png_ptr, length);
return;
}
else if ((png_ptr->mode & PNG_HAVE_acTL) != 0)
{
png_warning(png_ptr, "Duplicate acTL skipped");
png_crc_finish(png_ptr, length);
return;
}
else if (length != 8)
{
png_warning(png_ptr, "acTL with invalid length skipped");
png_crc_finish(png_ptr, length);
return;
}
png_crc_read(png_ptr, data, 8);
png_crc_finish(png_ptr, 0);
num_frames = png_get_uint_31(png_ptr, data);
num_plays = png_get_uint_31(png_ptr, data + 4);
/* the set function will do error checking on num_frames */
didSet = png_set_acTL(png_ptr, info_ptr, num_frames, num_plays);
if (didSet != 0)
png_ptr->mode |= PNG_HAVE_acTL;
}
void /* PRIVATE */
png_handle_fcTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte data[22];
png_uint_32 width;
png_uint_32 height;
png_uint_32 x_offset;
png_uint_32 y_offset;
png_uint_16 delay_num;
png_uint_16 delay_den;
png_byte dispose_op;
png_byte blend_op;
png_debug(1, "in png_handle_fcTL");
png_ensure_sequence_number(png_ptr, length);
if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
{
png_error(png_ptr, "Missing IHDR before fcTL");
}
else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
{
/* for any frames other then the first this message may be misleading,
* but correct. PNG_HAVE_IDAT is unset before the frame head is read
* i can't think of a better message */
png_warning(png_ptr, "Invalid fcTL after IDAT skipped");
png_crc_finish(png_ptr, length-4);
return;
}
else if ((png_ptr->mode & PNG_HAVE_fcTL) != 0)
{
png_warning(png_ptr, "Duplicate fcTL within one frame skipped");
png_crc_finish(png_ptr, length-4);
return;
}
else if (length != 26)
{
png_warning(png_ptr, "fcTL with invalid length skipped");
png_crc_finish(png_ptr, length-4);
return;
}
png_crc_read(png_ptr, data, 22);
png_crc_finish(png_ptr, 0);
width = png_get_uint_31(png_ptr, data);
height = png_get_uint_31(png_ptr, data + 4);
x_offset = png_get_uint_31(png_ptr, data + 8);
y_offset = png_get_uint_31(png_ptr, data + 12);
delay_num = png_get_uint_16(data + 16);
delay_den = png_get_uint_16(data + 18);
dispose_op = data[20];
blend_op = data[21];
if (png_ptr->num_frames_read == 0 && (x_offset != 0 || y_offset != 0))
{
png_warning(png_ptr, "fcTL for the first frame must have zero offset");
return;
}
if (info_ptr != NULL)
{
if (png_ptr->num_frames_read == 0 &&
(width != info_ptr->width || height != info_ptr->height))
{
png_warning(png_ptr, "size in first frame's fcTL must match "
"the size in IHDR");
return;
}
/* The set function will do more error checking */
png_set_next_frame_fcTL(png_ptr, info_ptr, width, height,
x_offset, y_offset, delay_num, delay_den,
dispose_op, blend_op);
png_read_reinit(png_ptr, info_ptr);
png_ptr->mode |= PNG_HAVE_fcTL;
}
}
void /* PRIVATE */
png_have_info(png_structp png_ptr, png_infop info_ptr)
{
if ((info_ptr->valid & PNG_INFO_acTL) != 0 &&
(info_ptr->valid & PNG_INFO_fcTL) == 0)
{
png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
info_ptr->num_frames++;
}
}
void /* PRIVATE */
png_handle_fdAT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_ensure_sequence_number(png_ptr, length);
/* This function is only called from png_read_end(), png_read_info(),
* and png_push_read_chunk() which means that:
* - the user doesn't want to read this frame
* - or this is an out-of-place fdAT
* in either case it is safe to ignore the chunk with a warning */
png_warning(png_ptr, "ignoring fdAT chunk");
png_crc_finish(png_ptr, length - 4);
PNG_UNUSED(info_ptr)
}
void /* PRIVATE */
png_ensure_sequence_number(png_structp png_ptr, png_uint_32 length)
{
png_byte data[4];
png_uint_32 sequence_number;
if (length < 4)
png_error(png_ptr, "invalid fcTL or fdAT chunk found");
png_crc_read(png_ptr, data, 4);
sequence_number = png_get_uint_31(png_ptr, data);
if (sequence_number != png_ptr->next_seq_num)
png_error(png_ptr, "fcTL or fdAT chunk with out-of-order sequence "
"number found");
png_ptr->next_seq_num++;
}
#endif /* READ_APNG */
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
/* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */
static int
@ -3162,7 +3341,11 @@ png_check_chunk_length(png_const_structrp png_ptr, png_uint_32 length)
if (PNG_USER_CHUNK_MALLOC_MAX < limit)
limit = PNG_USER_CHUNK_MALLOC_MAX;
# endif
#ifdef PNG_READ_APNG_SUPPORTED
if (png_ptr->chunk_name == png_IDAT || png_ptr->chunk_name == png_fdAT)
#else
if (png_ptr->chunk_name == png_IDAT)
#endif
{
png_alloc_size_t idat_limit = PNG_UINT_31_MAX;
size_t row_factor =
@ -4166,6 +4349,38 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
uInt avail_in;
png_bytep buffer;
#ifdef PNG_READ_APNG_SUPPORTED
png_uint_32 bytes_to_skip = 0;
while (png_ptr->idat_size == 0 || bytes_to_skip != 0)
{
png_crc_finish(png_ptr, bytes_to_skip);
bytes_to_skip = 0;
png_ptr->idat_size = png_read_chunk_header(png_ptr);
if (png_ptr->num_frames_read == 0)
{
if (png_ptr->chunk_name != png_IDAT)
png_error(png_ptr, "Not enough image data");
}
else
{
if (png_ptr->chunk_name == png_IEND)
png_error(png_ptr, "Not enough image data");
if (png_ptr->chunk_name != png_fdAT)
{
png_warning(png_ptr, "Skipped (ignored) a chunk "
"between APNG chunks");
bytes_to_skip = png_ptr->idat_size;
continue;
}
png_ensure_sequence_number(png_ptr, png_ptr->idat_size);
png_ptr->idat_size -= 4;
}
}
#else
while (png_ptr->idat_size == 0)
{
png_crc_finish(png_ptr, 0);
@ -4177,6 +4392,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
if (png_ptr->chunk_name != png_IDAT)
png_error(png_ptr, "Not enough image data");
}
#endif /* READ_APNG */
avail_in = png_ptr->IDAT_read_size;
@ -4240,6 +4456,9 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
#ifdef PNG_READ_APNG_SUPPORTED
png_ptr->num_frames_read++;
#endif
if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0)
png_chunk_benign_error(png_ptr, "Extra compressed data");
@ -4677,4 +4896,80 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
#ifdef PNG_READ_APNG_SUPPORTED
/* This function is to be called after the main IDAT set has been read and
* before a new IDAT is read. It resets some parts of png_ptr
* to make them usable by the read functions again */
void /* PRIVATE */
png_read_reset(png_structp png_ptr)
{
png_ptr->mode &= ~PNG_HAVE_IDAT;
png_ptr->mode &= ~PNG_AFTER_IDAT;
png_ptr->row_number = 0;
png_ptr->pass = 0;
}
void /* PRIVATE */
png_read_reinit(png_structp png_ptr, png_infop info_ptr)
{
png_ptr->width = info_ptr->next_frame_width;
png_ptr->height = info_ptr->next_frame_height;
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,png_ptr->width);
png_ptr->info_rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,
png_ptr->width);
if (png_ptr->prev_row != NULL)
memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
}
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
/* same as png_read_reset() but for the progressive reader */
void /* PRIVATE */
png_progressive_read_reset(png_structp png_ptr)
{
#ifdef PNG_READ_INTERLACING_SUPPORTED
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
if (png_ptr->interlaced != 0)
{
if ((png_ptr->transformations & PNG_INTERLACE) == 0)
png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
png_pass_ystart[0]) / png_pass_yinc[0];
else
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
}
else
#endif /* READ_INTERLACING */
{
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = png_ptr->width;
}
png_ptr->flags &= ~PNG_FLAG_ZSTREAM_ENDED;
if (inflateReset(&(png_ptr->zstream)) != Z_OK)
png_error(png_ptr, "inflateReset failed");
png_ptr->zstream.avail_in = 0;
png_ptr->zstream.next_in = 0;
png_ptr->zstream.next_out = png_ptr->row_buf;
png_ptr->zstream.avail_out = (uInt)PNG_ROWBYTES(png_ptr->pixel_depth,
png_ptr->iwidth) + 1;
}
#endif /* PROGRESSIVE_READ */
#endif /* READ_APNG */
#endif /* READ */

145
media/libpng/pngset.c
View File

@ -280,6 +280,11 @@ png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
#ifdef PNG_APNG_SUPPORTED
/* for non-animated png. this may be overwritten from an acTL chunk later */
info_ptr->num_frames = 1;
#endif
}
#ifdef PNG_oFFs_SUPPORTED
@ -1151,6 +1156,146 @@ png_set_sPLT(png_const_structrp png_ptr,
}
#endif /* sPLT */
#ifdef PNG_APNG_SUPPORTED
png_uint_32 PNGAPI
png_set_acTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 num_frames, png_uint_32 num_plays)
{
png_debug1(1, "in %s storage function", "acTL");
if (png_ptr == NULL || info_ptr == NULL)
{
png_warning(png_ptr,
"Call to png_set_acTL() with NULL png_ptr "
"or info_ptr ignored");
return (0);
}
if (num_frames == 0)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_frames zero");
return (0);
}
if (num_frames > PNG_UINT_31_MAX)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_frames > 2^31-1");
return (0);
}
if (num_plays > PNG_UINT_31_MAX)
{
png_warning(png_ptr,
"Ignoring attempt to set acTL with num_plays > 2^31-1");
return (0);
}
info_ptr->num_frames = num_frames;
info_ptr->num_plays = num_plays;
info_ptr->valid |= PNG_INFO_acTL;
return (1);
}
/* delay_num and delay_den can hold any 16-bit values including zero */
png_uint_32 PNGAPI
png_set_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op)
{
png_debug1(1, "in %s storage function", "fcTL");
if (png_ptr == NULL || info_ptr == NULL)
{
png_warning(png_ptr,
"Call to png_set_fcTL() with NULL png_ptr or info_ptr "
"ignored");
return (0);
}
png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
delay_num, delay_den, dispose_op, blend_op);
if (blend_op == PNG_BLEND_OP_OVER)
{
if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0 &&
png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) == 0)
{
png_warning(png_ptr, "PNG_BLEND_OP_OVER is meaningless "
"and wasteful for opaque images, ignored");
blend_op = PNG_BLEND_OP_SOURCE;
}
}
info_ptr->next_frame_width = width;
info_ptr->next_frame_height = height;
info_ptr->next_frame_x_offset = x_offset;
info_ptr->next_frame_y_offset = y_offset;
info_ptr->next_frame_delay_num = delay_num;
info_ptr->next_frame_delay_den = delay_den;
info_ptr->next_frame_dispose_op = dispose_op;
info_ptr->next_frame_blend_op = blend_op;
info_ptr->valid |= PNG_INFO_fcTL;
return (1);
}
void /* PRIVATE */
png_ensure_fcTL_is_valid(png_structp png_ptr,
png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den,
png_byte dispose_op, png_byte blend_op)
{
if (width == 0 || width > PNG_UINT_31_MAX)
png_error(png_ptr, "invalid width in fcTL (0 or > 2^31-1)");
if (height == 0 || height > PNG_UINT_31_MAX)
png_error(png_ptr, "invalid height in fcTL (0 or > 2^31-1)");
if (x_offset > PNG_UINT_31_MAX)
png_error(png_ptr, "invalid x_offset in fcTL (> 2^31-1)");
if (y_offset > PNG_UINT_31_MAX)
png_error(png_ptr, "invalid y_offset in fcTL (> 2^31-1)");
if (width + x_offset > png_ptr->first_frame_width ||
height + y_offset > png_ptr->first_frame_height)
png_error(png_ptr, "dimensions of a frame are greater than "
"the ones in IHDR");
if (dispose_op != PNG_DISPOSE_OP_NONE &&
dispose_op != PNG_DISPOSE_OP_BACKGROUND &&
dispose_op != PNG_DISPOSE_OP_PREVIOUS)
png_error(png_ptr, "invalid dispose_op in fcTL");
if (blend_op != PNG_BLEND_OP_SOURCE &&
blend_op != PNG_BLEND_OP_OVER)
png_error(png_ptr, "invalid blend_op in fcTL");
PNG_UNUSED(delay_num)
PNG_UNUSED(delay_den)
}
png_uint_32 PNGAPI
png_set_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr,
png_byte is_hidden)
{
png_debug(1, "in png_first_frame_is_hidden()");
if (png_ptr == NULL)
return 0;
if (is_hidden != 0)
png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
else
png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
PNG_UNUSED(info_ptr)
return 1;
}
#endif /* APNG */
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
static png_byte
check_location(png_const_structrp png_ptr, int location)

21
media/libpng/pngstruct.h
View File

@ -399,6 +399,27 @@ struct png_struct_def
png_byte filter_type;
#endif
#ifdef PNG_APNG_SUPPORTED
png_uint_32 apng_flags;
png_uint_32 next_seq_num; /* next fcTL/fdAT chunk sequence number */
png_uint_32 first_frame_width;
png_uint_32 first_frame_height;
#ifdef PNG_READ_APNG_SUPPORTED
png_uint_32 num_frames_read; /* incremented after all image data of */
/* a frame is read */
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
png_progressive_frame_ptr frame_info_fn; /* frame info read callback */
png_progressive_frame_ptr frame_end_fn; /* frame data read callback */
#endif
#endif
#ifdef PNG_WRITE_APNG_SUPPORTED
png_uint_32 num_frames_to_write;
png_uint_32 num_frames_written;
#endif
#endif /* APNG */
/* New members added in libpng-1.2.0 */
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */

47
media/libpng/pngwrite.c
View File

@ -128,6 +128,10 @@ png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
* the application continues writing the PNG. So check the 'invalid'
* flag here too.
*/
#ifdef PNG_WRITE_APNG_SUPPORTED
if ((info_ptr->valid & PNG_INFO_acTL) != 0)
png_write_acTL(png_ptr, info_ptr->num_frames, info_ptr->num_plays);
#endif
#ifdef PNG_GAMMA_SUPPORTED
# ifdef PNG_WRITE_gAMA_SUPPORTED
if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
@ -368,6 +372,11 @@ png_write_end(png_structrp png_ptr, png_inforp info_ptr)
if ((png_ptr->mode & PNG_HAVE_IDAT) == 0)
png_error(png_ptr, "No IDATs written into file");
#ifdef PNG_WRITE_APNG_SUPPORTED
if (png_ptr->num_frames_written != png_ptr->num_frames_to_write)
png_error(png_ptr, "Not enough frames written");
#endif
#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
png_ptr->num_palette_max >= png_ptr->num_palette)
@ -2415,4 +2424,42 @@ png_image_write_to_file(png_imagep image, const char *file_name,
}
#endif /* SIMPLIFIED_WRITE_STDIO */
#endif /* SIMPLIFIED_WRITE */
#ifdef PNG_WRITE_APNG_SUPPORTED
void PNGAPI
png_write_frame_head(png_structp png_ptr, png_infop info_ptr,
png_bytepp row_pointers, png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
png_byte blend_op)
{
png_debug(1, "in png_write_frame_head");
/* there is a chance this has been set after png_write_info was called,
* so it would be set but not written. is there a way to be sure? */
if ((info_ptr->valid & PNG_INFO_acTL) == 0)
png_error(png_ptr, "png_write_frame_head(): acTL not set");
png_write_reset(png_ptr);
png_write_reinit(png_ptr, info_ptr, width, height);
if ((png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN) == 0 ||
png_ptr->num_frames_written != 0)
png_write_fcTL(png_ptr, width, height, x_offset, y_offset,
delay_num, delay_den, dispose_op, blend_op);
PNG_UNUSED(row_pointers)
}
void PNGAPI
png_write_frame_tail(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_write_frame_tail");
png_ptr->num_frames_written++;
PNG_UNUSED(info_ptr)
}
#endif /* WRITE_APNG */
#endif /* WRITE */

142
media/libpng/pngwutil.c
View File

@ -336,8 +336,10 @@ png_deflate_claim(png_structrp png_ptr, png_uint_32 owner,
if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
strategy = png_ptr->zlib_strategy;
#ifdef PNG_WRITE_FILTER_SUPPORTED
else if (png_ptr->do_filter != PNG_FILTER_NONE)
strategy = PNG_Z_DEFAULT_STRATEGY;
#endif
else
strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY;
@ -821,14 +823,23 @@ png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height,
/* Write the chunk */
png_write_complete_chunk(png_ptr, png_IHDR, buf, 13);
#ifdef PNG_WRITE_APNG_SUPPORTED
png_ptr->first_frame_width = width;
png_ptr->first_frame_height = height;
#endif
if ((png_ptr->do_filter) == PNG_NO_FILTERS)
{
#ifdef PNG_WRITE_FILTER_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
png_ptr->bit_depth < 8)
png_ptr->do_filter = PNG_FILTER_NONE;
else
png_ptr->do_filter = PNG_ALL_FILTERS;
#else
png_ptr->do_filter = PNG_FILTER_NONE;
#endif
}
png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */
@ -1003,7 +1014,17 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
#endif
if (size > 0)
#ifdef PNG_WRITE_APNG_SUPPORTED
{
if (png_ptr->num_frames_written == 0)
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
#ifdef PNG_WRITE_APNG_SUPPORTED
else
png_write_fdAT(png_ptr, data, size);
}
#endif /* WRITE_APNG */
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->zstream.next_out = data;
@ -1050,7 +1071,17 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
#endif
if (size > 0)
#ifdef PNG_WRITE_APNG_SUPPORTED
{
if (png_ptr->num_frames_written == 0)
#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, size);
#ifdef PNG_WRITE_APNG_SUPPORTED
else
png_write_fdAT(png_ptr, data, size);
}
#endif /* WRITE_APNG */
png_ptr->zstream.avail_out = 0;
png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;
@ -1885,6 +1916,82 @@ png_write_tIME(png_structrp png_ptr, png_const_timep mod_time)
}
#endif
#ifdef PNG_WRITE_APNG_SUPPORTED
void /* PRIVATE */
png_write_acTL(png_structp png_ptr,
png_uint_32 num_frames, png_uint_32 num_plays)
{
png_byte buf[8];
png_debug(1, "in png_write_acTL");
png_ptr->num_frames_to_write = num_frames;
if ((png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN) != 0)
num_frames--;
png_save_uint_32(buf, num_frames);
png_save_uint_32(buf + 4, num_plays);
png_write_complete_chunk(png_ptr, png_acTL, buf, (png_size_t)8);
}
void /* PRIVATE */
png_write_fcTL(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
png_uint_32 x_offset, png_uint_32 y_offset,
png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,
png_byte blend_op)
{
png_byte buf[26];
png_debug(1, "in png_write_fcTL");
if (png_ptr->num_frames_written == 0 && (x_offset != 0 || y_offset != 0))
png_error(png_ptr, "x and/or y offset for the first frame aren't 0");
if (png_ptr->num_frames_written == 0 &&
(width != png_ptr->first_frame_width ||
height != png_ptr->first_frame_height))
png_error(png_ptr, "width and/or height in the first frame's fcTL "
"don't match the ones in IHDR");
/* more error checking */
png_ensure_fcTL_is_valid(png_ptr, width, height, x_offset, y_offset,
delay_num, delay_den, dispose_op, blend_op);
png_save_uint_32(buf, png_ptr->next_seq_num);
png_save_uint_32(buf + 4, width);
png_save_uint_32(buf + 8, height);
png_save_uint_32(buf + 12, x_offset);
png_save_uint_32(buf + 16, y_offset);
png_save_uint_16(buf + 20, delay_num);
png_save_uint_16(buf + 22, delay_den);
buf[24] = dispose_op;
buf[25] = blend_op;
png_write_complete_chunk(png_ptr, png_fcTL, buf, (png_size_t)26);
png_ptr->next_seq_num++;
}
void /* PRIVATE */
png_write_fdAT(png_structp png_ptr,
png_const_bytep data, png_size_t length)
{
png_byte buf[4];
png_write_chunk_header(png_ptr, png_fdAT, (png_uint_32)(4 + length));
png_save_uint_32(buf, png_ptr->next_seq_num);
png_write_chunk_data(png_ptr, buf, 4);
png_write_chunk_data(png_ptr, data, length);
png_write_chunk_end(png_ptr);
png_ptr->next_seq_num++;
}
#endif /* WRITE_APNG */
/* Initializes the row writing capability of libpng */
void /* PRIVATE */
png_write_start_row(png_structrp png_ptr)
@ -2778,4 +2885,39 @@ png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
}
#endif /* WRITE_FLUSH */
}
#ifdef PNG_WRITE_APNG_SUPPORTED
void /* PRIVATE */
png_write_reset(png_structp png_ptr)
{
png_ptr->row_number = 0;
png_ptr->pass = 0;
png_ptr->mode &= ~PNG_HAVE_IDAT;
}
void /* PRIVATE */
png_write_reinit(png_structp png_ptr, png_infop info_ptr,
png_uint_32 width, png_uint_32 height)
{
if (png_ptr->num_frames_written == 0 &&
(width != png_ptr->first_frame_width ||
height != png_ptr->first_frame_height))
png_error(png_ptr, "width and/or height in the first frame's fcTL "
"don't match the ones in IHDR");
if (width > png_ptr->first_frame_width ||
height > png_ptr->first_frame_height)
png_error(png_ptr, "width and/or height for a frame greater than "
"the ones in IHDR");
png_set_IHDR(png_ptr, info_ptr, width, height,
info_ptr->bit_depth, info_ptr->color_type,
info_ptr->interlace_type, info_ptr->compression_type,
info_ptr->filter_type);
png_ptr->width = width;
png_ptr->height = height;
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
png_ptr->usr_width = png_ptr->width;
}
#endif /* WRITE_APNG */
#endif /* WRITE */