mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
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gecko-dev/media/libpng/apng.patch

1566 строки
48 KiB
Diff
Исходник Ответственный История

Index: pngread.c
===================================================================
--- pngread.c
+++ pngread.c
@@ -240,6 +240,9 @@
!(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;
@@ -330,12 +333,91 @@
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->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 || 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)
@@ -537,6 +619,38 @@
{
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);
+
+ png_ptr->idat_size -= 4;
+ }
+ }
+#else
while (!png_ptr->idat_size)
{
png_crc_finish(png_ptr, 0);
@@ -545,6 +659,7 @@
if (png_ptr->chunk_name != png_IDAT)
png_error(png_ptr, "Not enough image data");
}
+#endif
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
if (png_ptr->zbuf_size > png_ptr->idat_size)
@@ -563,6 +678,9 @@
png_benign_error(png_ptr, "Extra compressed data");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+#ifdef PNG_READ_APNG_SUPPORTED
+ png_ptr->num_frames_read++;
+#endif
break;
}
Index: pngget.c
===================================================================
--- pngget.c
+++ pngget.c
@@ -1140,4 +1140,167 @@
# 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) &&
+ 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 */
Index: png.h
===================================================================
--- png.h
+++ png.h
@@ -454,6 +454,10 @@
# include "pnglibconf.h"
#endif
+#define PNG_APNG_SUPPORTED
+#define PNG_READ_APNG_SUPPORTED
+#define PNG_WRITE_APNG_SUPPORTED
+
#ifndef PNG_VERSION_INFO_ONLY
# ifndef PNG_BUILDING_SYMBOL_TABLE
/*
@@ -561,6 +565,17 @@
* 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.
*/
@@ -844,6 +859,10 @@
#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
@@ -889,6 +908,10 @@
#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
@@ -2709,6 +2732,75 @@
* END OF HARDWARE OPTIONS
******************************************************************************/
+#ifdef PNG_APNG_SUPPORTED
+PNG_EXPORT(237, 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(238, 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(239, png_uint_32, png_get_num_frames, (png_structp png_ptr,
+ png_infop info_ptr));
+
+PNG_EXPORT(240, png_uint_32, png_get_num_plays, (png_structp png_ptr,
+ png_infop info_ptr));
+
+PNG_EXPORT(241, 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(242, 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(243, png_uint_32, png_get_next_frame_width,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(244, png_uint_32, png_get_next_frame_height,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(245, png_uint_32, png_get_next_frame_x_offset,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(246, png_uint_32, png_get_next_frame_y_offset,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(247, png_uint_16, png_get_next_frame_delay_num,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(248, png_uint_16, png_get_next_frame_delay_den,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(249, png_byte, png_get_next_frame_dispose_op,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(250, png_byte, png_get_next_frame_blend_op,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(251, png_byte, png_get_first_frame_is_hidden,
+ (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(252, 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(253, void, png_read_frame_head, (png_structp png_ptr,
+ png_infop info_ptr));
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXPORT(254, 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(255, 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(256, 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
*/
@@ -2718,7 +2810,11 @@
* scripts/symbols.def as well.
*/
#ifdef PNG_EXPORT_LAST_ORDINAL
+#ifdef PNG_APNG_SUPPORTED
+ PNG_EXPORT_LAST_ORDINAL(256);
+#else
PNG_EXPORT_LAST_ORDINAL(236);
+#endif /* PNG_APNG_SUPPORTED */
#endif
#ifdef __cplusplus
Index: pngpriv.h
===================================================================
--- pngpriv.h
+++ pngpriv.h
@@ -501,6 +501,10 @@
#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
@@ -698,6 +702,16 @@
#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.
*/
@@ -1389,6 +1403,45 @@
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,
Index: pnginfo.h
===================================================================
--- pnginfo.h
+++ pnginfo.h
@@ -265,5 +265,18 @@
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 */
Index: pngstruct.h
===================================================================
--- pngstruct.h
+++ pngstruct.h
@@ -293,6 +293,27 @@
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 /* PNG_APNG_SUPPORTED */
+
/* 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 */
Index: pngwrite.c
===================================================================
--- pngwrite.c
+++ pngwrite.c
@@ -58,6 +58,10 @@
/* The rest of these check to see if the valid field has the appropriate
* flag set, and if it does, writes the chunk.
*/
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ if (info_ptr->valid & PNG_INFO_acTL)
+ png_write_acTL(png_ptr, info_ptr->num_frames, info_ptr->num_plays);
+#endif
#ifdef PNG_WRITE_gAMA_SUPPORTED
if (info_ptr->valid & PNG_INFO_gAMA)
png_write_gAMA_fixed(png_ptr, info_ptr->gamma);
@@ -310,6 +314,11 @@
png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
#endif
+#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
+
/* See if user wants us to write information chunks */
if (info_ptr != NULL)
{
@@ -1667,4 +1676,42 @@
PNG_UNUSED(params)
}
#endif
+
+#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))
+ 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->num_frames_written == 0 &&
+ (png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN) ) )
+ 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 /* PNG_WRITE_APNG_SUPPORTED */
#endif /* PNG_WRITE_SUPPORTED */
Index: pngpread.c
===================================================================
--- pngpread.c
+++ pngpread.c
@@ -215,6 +215,109 @@
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
@@ -318,6 +421,10 @@
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;
@@ -550,6 +657,27 @@
}
#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
{
@@ -758,7 +886,11 @@
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;
@@ -771,17 +903,64 @@
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)
@@ -859,6 +1038,15 @@
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.
@@ -1304,6 +1492,18 @@
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)
{
Index: pngset.c
===================================================================
--- pngset.c
+++ pngset.c
@@ -253,6 +253,11 @@
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
@@ -1039,6 +1044,147 @@
}
#endif /* PNG_sPLT_SUPPORTED */
+#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) &&
+ !(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+ {
+ 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 > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid width in fcTL (> 2^31-1)");
+ if (height > PNG_UINT_31_MAX)
+ png_error(png_ptr, "invalid height in fcTL (> 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)
+ png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN;
+ else
+ png_ptr->apng_flags &= ~PNG_FIRST_FRAME_HIDDEN;
+
+ PNG_UNUSED(info_ptr)
+
+ return 1;
+}
+#endif /* PNG_APNG_SUPPORTED */
+
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
void PNGAPI
png_set_unknown_chunks(png_structp png_ptr,
Index: pngrutil.c
===================================================================
--- pngrutil.c
+++ pngrutil.c
@@ -545,6 +545,11 @@
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;
@@ -2622,6 +2627,179 @@
}
#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))
+ {
+ png_error(png_ptr, "Missing IHDR before acTL");
+ }
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid acTL after IDAT skipped");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ else if (png_ptr->mode & PNG_HAVE_acTL)
+ {
+ 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)
+ 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))
+ {
+ png_error(png_ptr, "Missing IHDR before fcTL");
+ }
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ /* 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)
+ {
+ 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) && !(info_ptr->valid & PNG_INFO_fcTL))
+ {
+ 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 /* PNG_READ_APNG_SUPPORTED */
+
/* This function is called when we haven't found a handler for a
* chunk. If there isn't a problem with the chunk itself (ie bad
* chunk name, CRC, or a critical chunk), the chunk is silently ignored
@@ -4112,4 +4290,80 @@
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)
+ png_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 */
+ const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* Offset to next interlace block */
+ const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* Start of interlace block in the y direction */
+ const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* Offset to next interlace block in the y direction */
+ const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+
+ if (png_ptr->interlaced)
+ {
+ if (!(png_ptr->transformations & PNG_INTERLACE))
+ 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 /* PNG_READ_INTERLACING_SUPPORTED */
+ {
+ png_ptr->num_rows = png_ptr->height;
+ png_ptr->iwidth = png_ptr->width;
+ }
+ png_ptr->flags &= ~PNG_FLAG_ZLIB_FINISHED;
+ 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 /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif /* PNG_READ_APNG_SUPPORTED */
#endif /* PNG_READ_SUPPORTED */
Index: pngwutil.c
===================================================================
--- pngwutil.c
+++ pngwutil.c
@@ -818,6 +818,11 @@
/* Write the chunk */
png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ png_ptr->first_frame_width = width;
+ png_ptr->first_frame_height = height;
+#endif
+
/* Initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
@@ -1032,7 +1037,28 @@
}
#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ if (png_ptr->num_frames_written == 0)
+#endif
png_write_complete_chunk(png_ptr, png_IDAT, data, length);
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ else
+ {
+ 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 /* PNG_WRITE_APNG_SUPPORTED */
+
png_ptr->mode |= PNG_HAVE_IDAT;
/* Prior to 1.5.4 this code was replicated in every caller (except at the
@@ -1995,6 +2021,64 @@
}
#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)
+ 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++;
+}
+#endif /* PNG_WRITE_APNG_SUPPORTED */
+
/* Initializes the row writing capability of libpng */
void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
@@ -3174,4 +3258,39 @@
}
#endif
}
+
+#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 /* PNG_WRITE_APNG_SUPPORTED */
#endif /* PNG_WRITE_SUPPORTED */
Index: scripts/symbols.def
===================================================================
--- scripts/symbols.def
+++ scripts/symbols.def
@@ -242,3 +242,23 @@
png_set_check_for_invalid_index @234
png_get_palette_max @235
png_set_option @236
+ png_get_acTL @237
+ png_set_acTL @238
+ png_get_num_frames @239
+ png_get_num_plays @240
+ png_get_next_frame_fcTL @241
+ png_set_next_frame_fcTL @242
+ png_get_next_frame_width @243
+ png_get_next_frame_height @244
+ png_get_next_frame_x_offset @245
+ png_get_next_frame_y_offset @246
+ png_get_next_frame_delay_num @247
+ png_get_next_frame_delay_den @248
+ png_get_next_frame_dispose_op @249
+ png_get_next_frame_blend_op @250
+ png_get_first_frame_is_hidden @251
+ png_set_first_frame_is_hidden @252
+ png_read_frame_head @253
+ png_set_progressive_frame_fn @254
+ png_write_frame_head @255
+ png_write_frame_tail @256
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