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void-packages/srcpkgs/libpng/patches/libpng-1.4.1-apng.patch

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libpng: update to 1.4.2, bump abi_depends.
2010-05-07 12:20:12 +00:00
Index: pngread.c
===================================================================
--- pngread.c
+++ pngread.c
@@ -300,6 +300,11 @@
#ifdef PNG_READ_zTXt_SUPPORTED
PNG_zTXt;
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ PNG_acTL;
+ PNG_fcTL;
+ PNG_fdAT;
+#endif
png_uint_32 length = png_read_chunk_header(png_ptr);
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
@@ -343,6 +348,9 @@
!(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;
@@ -415,12 +423,95 @@
else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_acTL, 4))
+ png_handle_acTL(png_ptr, info_ptr, length);
+ else if (!png_memcmp(chunk_name, png_fcTL, 4))
+ png_handle_fcTL(png_ptr, info_ptr, length);
+ else if (!png_memcmp(chunk_name, png_fdAT, 4))
+ 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_IDAT;
+ PNG_fdAT;
+ PNG_fcTL;
+ png_byte chunk_length[4];
+ png_uint_32 length;
+
+ png_read_data(png_ptr, chunk_length, 4);
+ length = png_get_uint_31(png_ptr, chunk_length);
+
+ png_reset_crc(png_ptr);
+ png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+
+ if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ {
+ /* 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_memcmp(png_ptr->chunk_name, png_fcTL, 4))
+ {
+ png_handle_fcTL(png_ptr, info_ptr, length);
+ have_chunk_after_DAT = 1;
+ }
+ else if (!png_memcmp(png_ptr->chunk_name, png_fdAT, 4))
+ {
+ 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)
@@ -461,6 +552,10 @@
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
PNG_IDAT;
+#ifdef PNG_READ_APNG_SUPPORTED
+ PNG_fdAT;
+ PNG_IEND;
+#endif
PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
0xff};
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
@@ -596,13 +691,39 @@
{
if (!(png_ptr->zstream.avail_in))
{
- while (!png_ptr->idat_size)
+ png_uint_32 bytes_to_skip = 0;
+
+ while (!png_ptr->idat_size || bytes_to_skip != 0)
{
- png_crc_finish(png_ptr, 0);
+ png_crc_finish(png_ptr, bytes_to_skip);
+ bytes_to_skip = 0;
png_ptr->idat_size = png_read_chunk_header(png_ptr);
+#ifdef PNG_READ_APNG_SUPPORTED
+ if (png_ptr->num_frames_read == 0)
+ {
+#endif
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
+#ifdef PNG_READ_APNG_SUPPORTED
+ }
+ else
+ {
+ if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ png_error(png_ptr, "Not enough image data");
+ if (png_memcmp(png_ptr->chunk_name, png_fdAT, 4))
+ {
+ 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;
+ }
+#endif
}
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
@@ -620,6 +741,9 @@
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;
}
if (ret != Z_OK)
@@ -875,6 +999,11 @@
#ifdef PNG_READ_zTXt_SUPPORTED
PNG_zTXt;
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ PNG_acTL;
+ PNG_fcTL;
+ PNG_fdAT;
+#endif
png_uint_32 length = png_read_chunk_header(png_ptr);
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
@@ -974,6 +1103,14 @@
else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_acTL, 4))
+ png_handle_acTL(png_ptr, info_ptr, length);
+ else if (!png_memcmp(chunk_name, png_fcTL, 4))
+ png_handle_fcTL(png_ptr, info_ptr, length);
+ else if (!png_memcmp(chunk_name, png_fdAT, 4))
+ png_handle_fdAT(png_ptr, info_ptr, length);
+#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
} while (!(png_ptr->mode & PNG_HAVE_IEND));
Index: pngget.c
===================================================================
--- pngget.c
+++ pngget.c
@@ -842,6 +842,167 @@
}
#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 && x_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);
+
+ return 0;
+}
+#endif /* PNG_APNG_SUPPORTED */
+
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
png_uint_32 PNGAPI
png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
Index: png.h
===================================================================
--- png.h
+++ png.h
@@ -888,6 +888,19 @@
png_fixed_point int_y_blue PNG_DEPSTRUCT;
#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
+
} png_info;
typedef png_info FAR * png_infop;
@@ -985,6 +998,10 @@
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_INFO_acTL 0x10000L
+#define PNG_INFO_fcTL 0x20000L
+#endif
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@@ -1026,6 +1043,10 @@
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
png_uint_32, int));
+#ifdef PNG_APNG_SUPPORTED
+typedef void (PNGAPI *png_progressive_frame_ptr) PNGARG((png_structp,
+ png_uint_32));
+#endif
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
@@ -1445,6 +1466,36 @@
png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
#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
+
+/* 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 */
+
/* New member added in libpng-1.0.25 and 1.2.17 */
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
/* Storage for unknown chunk that the library doesn't recognize. */
@@ -1773,6 +1824,18 @@
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
png_bytepp image));
+#ifdef PNG_WRITE_APNG_SUPPORTED
+extern PNG_EXPORT (void,png_write_frame_head) PNGARG((png_structp png_ptr,
+ png_infop png_info, 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));
+
+extern PNG_EXPORT (void,png_write_frame_tail) PNGARG((png_structp png_ptr,
+ png_infop png_info));
+#endif
+
/* Write the end of the PNG file. */
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
png_infop info_ptr));
@@ -2017,6 +2080,11 @@
png_voidp progressive_ptr,
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn));
+#ifdef PNG_READ_APNG_SUPPORTED
+extern PNG_EXPORT(void,png_set_progressive_frame_fn) PNGARG((png_structp png_ptr,
+ png_progressive_frame_ptr frame_info_fn,
+ png_progressive_frame_ptr frame_end_fn));
+#endif
/* Returns the user pointer associated with the push read functions */
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
@@ -2443,6 +2511,53 @@
#endif
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
+#ifdef PNG_APNG_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_acTL) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 *num_frames, png_uint_32 *num_plays));
+extern PNG_EXPORT(png_uint_32,png_set_acTL) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 num_frames, png_uint_32 num_plays));
+extern PNG_EXPORT(png_uint_32,png_get_num_frames) PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32,png_get_num_plays)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+
+extern PNG_EXPORT(png_uint_32,png_get_next_frame_fcTL)
+ PNGARG((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));
+extern PNG_EXPORT(png_uint_32,png_set_next_frame_fcTL)
+ PNGARG((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));
+extern PNG_EXPORT(png_uint_32,png_get_next_frame_width)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32,png_get_next_frame_height)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32,png_get_next_frame_x_offset)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32,png_get_next_frame_y_offset)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_16,png_get_next_frame_delay_num)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_16,png_get_next_frame_delay_den)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_byte,png_get_next_frame_dispose_op)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_byte,png_get_next_frame_blend_op)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_byte,png_get_first_frame_is_hidden)
+ PNGARG((png_structp png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32,png_set_first_frame_is_hidden)
+ PNGARG((png_structp png_ptr, png_infop info_ptr, png_byte is_hidden));
+#endif /* PNG_APNG_SUPPORTED */
+
+#ifdef PNG_READ_APNG_SUPPORTED
+extern PNG_EXPORT(void,png_read_frame_head) PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+#endif
+
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
/* Provide a list of chunks and how they are to be handled, if the built-in
handling or default unknown chunk handling is not desired. Any chunks not
Index: pngpriv.h
===================================================================
--- pngpriv.h
+++ pngpriv.h
@@ -98,6 +98,10 @@
#define PNG_BACKGROUND_IS_GRAY 0x800
#define PNG_HAVE_PNG_SIGNATURE 0x1000
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_HAVE_acTL 0x4000
+#define PNG_HAVE_fcTL 0x8000L
+#endif
/* Flags for the transformations the PNG library does on the image data */
#define PNG_BGR 0x0001
@@ -231,6 +235,14 @@
#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
+#ifdef PNG_APNG_SUPPORTED
+#define PNG_acTL PNG_CONST png_byte png_acTL[5] = { 97, 99, 84, 76, '\0'}
+#define PNG_fcTL PNG_CONST png_byte png_fcTL[5] = {102, 99, 84, 76, '\0'}
+#define PNG_fdAT PNG_CONST png_byte png_fdAT[5] = {102, 100, 65, 84, '\0'}
+
+/* For png_struct.apng_flags: */
+#define PNG_FIRST_FRAME_HIDDEN 0x0001
+#endif
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
@@ -468,6 +480,17 @@
#endif
#endif
+#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));
+#endif
+
/* Called when finished processing a row of data */
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
@@ -520,6 +543,20 @@
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
png_infop info_ptr));
+#ifdef PNG_READ_APNG_SUPPORTED
+/* Private, reset some things to become ready for reading next frame */
+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));
+PNG_EXTERN void png_progressive_read_reset PNGARG((png_structp png_ptr));
+#endif
+#ifdef PNG_WRITE_APNG_SUPPORTED
+/* Private, reset some things to become ready for writing next frame */
+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
+
/* These are the functions that do the transformations */
#ifdef PNG_READ_FILLER_SUPPORTED
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
@@ -736,6 +773,25 @@
png_uint_32 length));
#endif
+#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_have_info PNGARG((png_structp png_ptr, png_infop info_ptr));
+PNG_EXTERN void png_handle_fdAT PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+PNG_EXTERN void png_ensure_sequence_number PNGARG((png_structp png_ptr,
+ png_uint_32 length));
+#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));
+#endif
+
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 length));
Index: pngwrite.c
===================================================================
--- pngwrite.c
+++ pngwrite.c
@@ -57,6 +57,10 @@
/* 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)
{
@@ -319,6 +323,10 @@
return;
if (!(png_ptr->mode & PNG_HAVE_IDAT))
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
/* See if user wants us to write information chunks */
if (info_ptr != NULL)
@@ -1454,4 +1462,39 @@
params = 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);
+}
+
+void PNGAPI
+png_write_frame_tail(png_structp png_ptr, png_infop png_info)
+{
+ png_debug(1, "in png_write_frame_tail");
+
+ png_ptr->num_frames_written++;
+}
+#endif /* PNG_WRITE_APNG_SUPPORTED */
+
#endif /* PNG_WRITE_SUPPORTED */
Index: pngconf.h
===================================================================
--- pngconf.h
+++ pngconf.h
@@ -869,6 +869,10 @@
# define PNG_READ_tRNS_SUPPORTED
# define PNG_tRNS_SUPPORTED
#endif
+#ifndef PNG_NO_READ_APNG
+# define PNG_READ_APNG_SUPPORTED
+# define PNG_APNG_SUPPORTED
+#endif
#ifndef PNG_NO_READ_zTXt
# define PNG_READ_zTXt_SUPPORTED
# define PNG_zTXt_SUPPORTED
@@ -1028,6 +1032,14 @@
# define PNG_TEXT_SUPPORTED
# endif
#endif
+#ifndef PNG_NO_WRITE_APNG
+# ifndef PNG_WRITE_APNG_SUPPORTED
+# define PNG_WRITE_APNG_SUPPORTED
+# endif
+# ifndef PNG_APNG_SUPPORTED
+# define PNG_APNG_SUPPORTED
+# endif
+#endif
#ifdef PNG_WRITE_tIME_SUPPORTED
# ifndef PNG_NO_CONVERT_tIME
Index: pngpread.c
===================================================================
--- pngpread.c
+++ pngpread.c
@@ -205,6 +205,11 @@
#ifdef PNG_READ_zTXt_SUPPORTED
PNG_zTXt;
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ PNG_acTL;
+ PNG_fcTL;
+ PNG_fdAT;
+#endif
/* First we make sure we have enough data for the 4 byte chunk name
* and the 4 byte chunk length before proceeding with decoding the
@@ -230,6 +235,103 @@
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
}
+#ifdef PNG_READ_APNG_SUPPORTED
+ if (png_ptr->num_frames_read > 0 &&
+ png_ptr->num_frames_read < info_ptr->num_frames)
+ {
+ if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ {
+ /* 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 (!png_memcmp(png_ptr->chunk_name, png_fdAT, 4))
+ {
+ 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(!png_memcmp(png_ptr->chunk_name, png_fcTL, 4))
+ {
+ 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 (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
if (png_ptr->mode & PNG_AFTER_IDAT)
png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
@@ -325,6 +427,9 @@
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;
@@ -557,6 +662,38 @@
}
#endif
+#ifdef PNG_READ_APNG_SUPPORTED
+ else if (!png_memcmp(png_ptr->chunk_name, png_acTL, 4))
+ {
+ 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 (!png_memcmp(png_ptr->chunk_name, png_fcTL, 4))
+ {
+ 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);
+ }
+ else if (!png_memcmp(png_ptr->chunk_name, png_fdAT, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ png_handle_fdAT(png_ptr, info_ptr, png_ptr->push_length);
+ }
+#endif /* PNG_READ_APNG_SUPPORTED */
else
{
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -736,11 +873,15 @@
png_push_read_IDAT(png_structp png_ptr)
{
PNG_IDAT;
+#ifdef PNG_READ_APNG_SUPPORTED
+ PNG_fdAT;
+ PNG_IEND;
+#endif
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
png_byte chunk_length[4];
- if (png_ptr->buffer_size < 8)
+ if (png_ptr->buffer_size < 12)
{
png_push_save_buffer(png_ptr);
return;
@@ -752,15 +893,62 @@
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
- if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+#ifdef PNG_READ_APNG_SUPPORTED
+ if (png_memcmp(png_ptr->chunk_name, png_fdAT, 4)
+ && 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_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ 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
+ if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)
+#ifdef PNG_READ_APNG_SUPPORTED
+ && (png_ptr->num_frames_read == 0)
+#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)
{
@@ -1716,6 +1904,17 @@
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;
+}
+#endif
+
png_voidp PNGAPI
png_get_progressive_ptr(png_structp png_ptr)
{
Index: pngset.c
===================================================================
--- pngset.c
+++ pngset.c
@@ -260,6 +260,11 @@
info_ptr->rowbytes = 0;
else
info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
+
+#ifdef PNG_APNG_SUPPORTED
+ /* for non-animated png. this may be overritten from an acTL chunk later */
+ info_ptr->num_frames = 1;
+#endif
}
#ifdef PNG_oFFs_SUPPORTED
@@ -932,6 +937,142 @@
}
#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 + 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 (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 (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_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;
+
+ 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
@@ -434,6 +434,11 @@
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;
@@ -2318,6 +2323,172 @@
}
#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_error(png_ptr, "fcTL for the first frame must have zero offset");
+
+ if (info_ptr != NULL)
+ {
+ if (png_ptr->num_frames_read == 0 &&
+ (width != info_ptr->width || height != info_ptr->height))
+ png_error(png_ptr, "size in first frame's fcTL must match "
+ "the size in IHDR");
+
+ /* 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);
+}
+
+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
@@ -3353,4 +3524,73 @@
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;
+ png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+
+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);
+ if (png_ptr->prev_row)
+ png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+}
+
+/* same as png_read_reset() but for the progressive reader */
+void /* PRIVATE */
+png_progressive_read_reset(png_structp png_ptr)
+{
+ /* 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
+ {
+ 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_READ_APNG_SUPPORTED */
#endif /* PNG_READ_SUPPORTED */
Index: pngwutil.c
===================================================================
--- pngwutil.c
+++ pngwutil.c
@@ -539,6 +539,11 @@
/* Write the chunk */
png_write_chunk(png_ptr, (png_bytep)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;
@@ -661,6 +666,9 @@
png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
{
PNG_IDAT;
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ PNG_fdAT;
+#endif
png_debug(1, "in png_write_IDAT");
@@ -705,7 +713,28 @@
"Invalid zlib compression method or flags in IDAT");
}
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ if(png_ptr->num_frames_written == 0)
+#endif
png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
+#ifdef PNG_WRITE_APNG_SUPPORTED
+ else
+ {
+ png_byte buf[4];
+
+ png_write_chunk_start(png_ptr, (png_bytep)png_fdAT, 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_ptr->mode |= PNG_HAVE_IDAT;
}
@@ -1712,6 +1741,66 @@
}
#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_acTL;
+ png_byte data[16];
+
+ 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(data, num_frames);
+ png_save_uint_32(data + 4, num_plays);
+
+ png_write_chunk(png_ptr, (png_bytep)png_acTL, data, (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_fcTL;
+ png_byte data[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(data, png_ptr->next_seq_num);
+ png_save_uint_32(data + 4, width);
+ png_save_uint_32(data + 8, height);
+ png_save_uint_32(data + 12, x_offset);
+ png_save_uint_32(data + 16, y_offset);
+ png_save_uint_16(data + 20, delay_num);
+ png_save_uint_16(data + 22, delay_den);
+ data[24] = dispose_op;
+ data[25] = blend_op;
+
+ png_write_chunk(png_ptr, (png_bytep)png_fcTL, data, (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)
@@ -2113,8 +2202,8 @@
#ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS)
{
- /* These will never be selected so we need not test them. */
- filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH);
+ /* These use previous row */
+ filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_AVG | PNG_FILTER_PAETH);
}
#endif
@@ -2783,4 +2872,39 @@
}
#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
#endif /* PNG_WRITE_SUPPORTED */
Index: pngrtran.c
===================================================================
--- pngrtran.c
+++ pngrtran.c
@@ -1325,7 +1325,7 @@
* pixels. This check added to libpng-1.2.19
*/
#if (PNG_WARN_UNINITIALIZED_ROW==1)
- png_error(png_ptr, "Uninitialized row");
+ png_warning(png_ptr, "Uninitialized row");
#else
png_warning(png_ptr, "Uninitialized row");
#endif
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