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apng.patch
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apng.patch
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diff -up8 png.h png.h
--- png.h 2012-06-14 07:28:00 -0400
+++ png.h 2012-07-07 10:21:31 -0400
@@ -423,24 +423,18 @@
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
* version 1.0.0 was mis-numbered 100 instead of 10000). From
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
*/
#define PNG_LIBPNG_VER 10511 /* 1.5.11 */
-/* Library configuration: these options cannot be changed after
- * the library has been built.
- */
-#ifndef PNGLCONF_H
- /* If pnglibconf.h is missing, you can
- * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
- */
-# include "pnglibconf.h"
+#ifndef MOZPNGCONF_H
+# include "mozpngconf.h"
#endif
#ifndef PNG_VERSION_INFO_ONLY
# ifndef PNG_BUILDING_SYMBOL_TABLE
/*
* Standard header files (not needed for the version info or while
* building symbol table -- see scripts/pnglibconf.dfa)
*/
@@ -540,16 +534,27 @@ extern "C" {
* Otherwise the calls are mapped to png_error.
*/
/* Section 2: type definitions, including structures and compile time
* constants.
* 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 /* PNG_APNG_SUPPORTED */
+
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
typedef char* png_libpng_version_1_5_11;
/* Three color definitions. The order of the red, green, and blue, (and the
* exact size) is not important, although the size of the fields need to
* be png_byte or png_uint_16 (as defined below).
@@ -823,16 +828,20 @@ typedef png_info FAR * FAR * png_infopp;
#define PNG_INFO_oFFs 0x0100
#define PNG_INFO_tIME 0x0200
#define PNG_INFO_pCAL 0x0400
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_INFO_acTL 0x10000
+#define PNG_INFO_fcTL 0x20000
+#endif
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
* the routines for other purposes.
*/
typedef struct png_row_info_struct
{
png_uint_32 width; /* width of row */
@@ -868,16 +877,20 @@ typedef PNG_CALLBACK(void, *png_flush_pt
typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
int));
typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
int));
#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
* row number is the row number within the sub-image of the interlace pass, so
* the value will increase to the height of the sub-image (not the full image)
* then reset to 0 for the next pass.
*
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
@@ -2644,26 +2657,99 @@ PNG_EXPORT(207, void, png_save_uint_16,
#endif
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
PNG_EXPORT(234, void, png_set_check_for_invalid_index, (png_structp png_ptr,
int allowed));
#endif
+#ifdef PNG_APNG_SUPPORTED
+PNG_EXPORT(235, 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(236, 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(237, png_uint_32, png_get_num_frames, (png_structp png_ptr,
+ png_infop info_ptr));
+
+PNG_EXPORT(238, png_uint_32, png_get_num_plays, (png_structp png_ptr,
+ png_infop info_ptr));
+
+PNG_EXPORT(239, 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(240, 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(241, png_uint_32, png_get_next_frame_width,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(242, png_uint_32, png_get_next_frame_height,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(243, png_uint_32, png_get_next_frame_x_offset,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(244, png_uint_32, png_get_next_frame_y_offset,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(245, png_uint_16, png_get_next_frame_delay_num,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(246, png_uint_16, png_get_next_frame_delay_den,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(247, png_byte, png_get_next_frame_dispose_op,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(248, png_byte, png_get_next_frame_blend_op,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(249, png_byte, png_get_first_frame_is_hidden,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(250, 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(251, void, png_read_frame_head, (png_structp png_ptr,
+ png_infop info_ptr));
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXPORT(252, 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 /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif /* PNG_READ_APNG_SUPPORTED */
+
+#ifdef PNG_WRITE_APNG_SUPPORTED
+PNG_EXPORT(253, 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(254, void, png_write_frame_tail, (png_structp png_ptr,
+ png_infop info_ptr));
+#endif /* PNG_WRITE_APNG_SUPPORTED */
+#endif /* PNG_APNG_SUPPORTED */
+
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
* defs
*/
/* The last ordinal number (this is the *last* one already used; the next
* one to use is one more than this.) Maintainer, remember to add an entry to
* scripts/symbols.def as well.
*/
#ifdef PNG_EXPORT_LAST_ORDINAL
+#ifdef PNG_APNG_SUPPORTED
+ PNG_EXPORT_LAST_ORDINAL(254);
+#else
PNG_EXPORT_LAST_ORDINAL(234);
+#endif /* PNG_APNG_SUPPORTED */
#endif
#ifdef __cplusplus
}
#endif
#endif /* PNG_VERSION_INFO_ONLY */
/* Do not put anything past this line */
diff -up8 pngget.c pngget.c
--- pngget.c 2012-06-14 07:28:00 -0400
+++ pngget.c 2012-04-24 20:51:09 -0400
@@ -1116,9 +1116,171 @@ png_get_io_chunk_type (png_const_structp
png_const_bytep PNGAPI
png_get_io_chunk_name (png_structp png_ptr)
{
PNG_CSTRING_FROM_CHUNK(png_ptr->io_chunk_string, png_ptr->chunk_name);
return png_ptr->io_chunk_string;
}
#endif /* ?PNG_IO_STATE_SUPPORTED */
+#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) &&
+ 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) &&
+ 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 /* PNG_APNG_SUPPORTED */
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
diff -up8 pnginfo.h pnginfo.h
--- pnginfo.h 2012-06-14 07:28:00 -0400
+++ pnginfo.h 2012-03-03 22:17:56 -0500
@@ -260,10 +260,23 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
#ifdef PNG_INFO_IMAGE_SUPPORTED
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
non-zero */
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
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 */
diff -up8 pngpread.c pngpread.c
--- pngpread.c 2012-06-14 07:28:00 -0400
+++ pngpread.c 2012-07-16 20:05:38 -0400
@@ -210,16 +210,119 @@ png_push_read_chunk(png_structp png_ptr,
png_crc_read(png_ptr, chunk_tag, 4);
png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
}
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 || png_ptr->num_frames_read > 1)
+ png_error(png_ptr, "out of place IDAT");
+
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ png_push_crc_skip(png_ptr, png_ptr->push_length);
+ png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+ return;
+ }
+ else if (chunk_name == png_fdAT)
+ {
+ if (png_ptr->buffer_size < 4)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ png_ensure_sequence_number(png_ptr, 4);
+
+ if (!(png_ptr->mode & PNG_HAVE_fcTL))
+ {
+ /* Discard trailing fdATs for frames other than the first */
+ if (png_ptr->num_frames_read < 2)
+ png_error(png_ptr, "out of place fdAT");
+
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ png_push_crc_skip(png_ptr, png_ptr->push_length);
+ png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+ return;
+ }
+
+ 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;
+
+ return;
+ }
+ }
+
+ else if (chunk_name == png_fcTL)
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ 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))
+ 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;
+
+ return;
+ }
+
+ else
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_warning(png_ptr, "Skipped (ignored) a chunk "
+ "between APNG chunks");
+ png_push_crc_skip(png_ptr, png_ptr->push_length);
+ png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
+ return;
+ }
+
+ return;
+ }
+#endif /* PNG_READ_APNG_SUPPORTED */
+
if (chunk_name == png_IDAT)
{
/* This is here above the if/else case statement below because if the
* unknown handling marks 'IDAT' as unknown then the IDAT handling case is
* completely skipped.
*
* TODO: there must be a better way of doing this.
*/
@@ -313,16 +416,20 @@ png_push_read_chunk(png_structp png_ptr,
if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
if (png_ptr->push_length == 0)
return;
if (png_ptr->mode & PNG_AFTER_IDAT)
png_benign_error(png_ptr, "Too many IDATs found");
}
+#ifdef PNG_READ_APNG_SUPPORTED
+ png_have_info(png_ptr, info_ptr);
+#endif
+
png_ptr->idat_size = png_ptr->push_length;
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
png_push_have_info(png_ptr, info_ptr);
png_ptr->zstream.avail_out =
(uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
png_ptr->iwidth) + 1;
png_ptr->zstream.next_out = png_ptr->row_buf;
@@ -546,16 +653,38 @@ png_push_read_chunk(png_structp png_ptr,
return;
}
png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ else if (chunk_name == png_acTL)
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_handle_acTL(png_ptr, info_ptr, png_ptr->push_length);
+ }
+
+ else if (chunk_name == png_fcTL)
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length);
+ }
+#endif /* PNG_READ_APNG_SUPPORTED */
+
else
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
{
png_push_save_buffer(png_ptr);
return;
}
png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
@@ -753,40 +882,91 @@ void /* PRIVATE */
png_push_read_IDAT(png_structp png_ptr)
{
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
png_byte chunk_length[4];
png_byte chunk_tag[4];
/* TODO: this code can be commoned up with the same code in push_read */
+#ifdef PNG_READ_APNG_SUPPORTED
+ if (png_ptr->buffer_size < 12)
+#else
if (png_ptr->buffer_size < 8)
+#endif
{
png_push_save_buffer(png_ptr);
return;
}
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);
png_crc_read(png_ptr, chunk_tag, 4);
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_ZLIB_FINISHED)
+ {
+ 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");
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ 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_ZLIB_FINISHED))
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 && png_ptr->save_buffer_size)
{
png_size_t save_size = png_ptr->save_buffer_size;
png_uint_32 idat_size = png_ptr->idat_size;
/* We want the smaller of 'idat_size' and 'current_buffer_size', but they
@@ -854,16 +1034,25 @@ png_push_read_IDAT(png_structp png_ptr)
void /* PRIVATE */
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
/* The caller checks for a non-zero buffer length. */
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) && png_ptr->num_frames_read > 0)
+ {
+ png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ 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.
*/
png_ptr->zstream.next_in = buffer;
png_ptr->zstream.avail_in = (uInt)buffer_length;
/* Keep going until the decompressed data is all processed
@@ -1299,16 +1488,28 @@ png_set_progressive_read_fn(png_structp
png_ptr->info_fn = info_fn;
png_ptr->row_fn = row_fn;
png_ptr->end_fn = end_fn;
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_structp png_ptr)
{
if (png_ptr == NULL)
return (NULL);
return png_ptr->io_ptr;
}
diff -up8 pngpriv.h pngpriv.h
--- pngpriv.h 2012-06-14 07:28:00 -0400
+++ pngpriv.h 2012-07-16 20:05:38 -0400
@@ -462,16 +462,20 @@ typedef PNG_CONST png_uint_16p FAR * png
#define PNG_HAVE_sRGB 0x80
#define PNG_HAVE_CHUNK_HEADER 0x100
#define PNG_WROTE_tIME 0x200
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
#define PNG_BACKGROUND_IS_GRAY 0x800
#define PNG_HAVE_PNG_SIGNATURE 0x1000
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
#define PNG_HAVE_iCCP 0x4000
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_HAVE_acTL 0x8000
+#define PNG_HAVE_fcTL 0x10000
+#endif
/* Flags for the transformations the PNG library does on the image data */
#define PNG_BGR 0x0001
#define PNG_INTERLACE 0x0002
#define PNG_PACK 0x0004
#define PNG_SHIFT 0x0008
#define PNG_SWAP_BYTES 0x0010
#define PNG_INVERT_MONO 0x0020
@@ -657,16 +661,26 @@ PNG_EXTERN png_fixed_point png_fixed PNG
#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
#define png_sTER PNG_CHUNK(115, 84, 69, 82)
#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
#define png_tIME PNG_CHUNK(116, 73, 77, 69)
#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
+#ifdef PNG_APNG_SUPPORTED
+#define png_acTL PNG_CHUNK( 97, 99, 84, 76)
+#define png_fcTL PNG_CHUNK(102, 99, 84, 76)
+#define png_fdAT PNG_CHUNK(102, 100, 65, 84)
+
+/* For png_struct.apng_flags: */
+#define PNG_FIRST_FRAME_HIDDEN 0x0001
+#define PNG_APNG_APP 0x0002
+#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.
*/
#define PNG_CHUNK_FROM_STRING(s)\
PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
* signed and the argument is a (char[]) This macro will fail miserably on
@@ -1338,16 +1352,55 @@ PNG_EXTERN void png_push_read_iTXt PNGAR
#ifdef PNG_MNG_FEATURES_SUPPORTED
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
png_bytep row));
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
png_bytep row));
#endif
+#ifdef PNG_APNG_SUPPORTED
+PNG_EXTERN void png_ensure_fcTL_is_valid PNGARG((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));
+
+#ifdef PNG_READ_APNG_SUPPORTED
+PNG_EXTERN void png_handle_acTL PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+PNG_EXTERN void png_handle_fcTL PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+PNG_EXTERN void png_handle_fdAT PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+PNG_EXTERN void png_have_info PNGARG((png_structp png_ptr, png_infop info_ptr));
+PNG_EXTERN void png_ensure_sequence_number PNGARG((png_structp png_ptr,
+ png_uint_32 length));
+PNG_EXTERN void png_read_reset PNGARG((png_structp png_ptr));
+PNG_EXTERN void png_read_reinit PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void png_progressive_read_reset PNGARG((png_structp png_ptr));
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif /* PNG_READ_APNG_SUPPORTED */
+
+#ifdef PNG_WRITE_APNG_SUPPORTED
+PNG_EXTERN void png_write_acTL PNGARG((png_structp png_ptr,
+ png_uint_32 num_frames, png_uint_32 num_plays));
+PNG_EXTERN void png_write_fcTL PNGARG((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_EXTERN void png_write_reset PNGARG((png_structp png_ptr));
+PNG_EXTERN void png_write_reinit PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 width, png_uint_32 height));
+#endif /* PNG_WRITE_APNG_SUPPORTED */
+#endif /* PNG_APNG_SUPPORTED */
+
/* Added at libpng version 1.4.0 */
#ifdef PNG_CHECK_cHRM_SUPPORTED
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
png_fixed_point int_white_x, png_fixed_point int_white_y,
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
png_fixed_point int_blue_y));
#endif
diff -up8 pngread.c pngread.c
--- pngread.c 2012-06-14 07:28:00 -0400
+++ pngread.c 2012-07-16 20:05:38 -0400
@@ -235,16 +235,19 @@ png_read_info(png_structp png_ptr, png_i
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
+#ifdef PNG_READ_APNG_SUPPORTED
+ png_have_info(png_ptr, info_ptr);
+#endif
png_ptr->idat_size = length;
png_ptr->mode |= PNG_HAVE_IDAT;
break;
}
#ifdef PNG_READ_bKGD_SUPPORTED
else if (chunk_name == png_bKGD)
png_handle_bKGD(png_ptr, info_ptr, length);
@@ -325,22 +328,100 @@ png_read_info(png_structp png_ptr, png_i
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
#ifdef PNG_READ_iTXt_SUPPORTED
else if (chunk_name == png_iTXt)
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);
}
}
#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+#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))
+ 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_crc_finish(png_ptr, 0); /* CRC from last IDAT or fdAT chunk */
+
+ png_read_reset(png_ptr);
+ 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 || 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 && 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 /* PNG_READ_APNG_SUPPORTED */
+
/* Optional call to update the users info_ptr structure */
void PNGAPI
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_update_info");
if (png_ptr == NULL)
return;
@@ -532,24 +613,57 @@ png_read_row(png_structp png_ptr, png_by
png_ptr->zstream.avail_out =
(uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,
png_ptr->iwidth) + 1);
do
{
if (!(png_ptr->zstream.avail_in))
{
+#ifdef PNG_READ_APNG_SUPPORTED
+ png_uint_32 bytes_to_skip = 0;
+
+ while (!png_ptr->idat_size || 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);
+