+++ /dev/null
-Index: pngread.c
-===================================================================
---- pngread.c
-+++ pngread.c
-@@ -278,6 +278,11 @@
- #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;
-
-@@ -321,6 +326,9 @@
- !(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;
-@@ -393,12 +401,95 @@
- 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)
-@@ -439,6 +530,10 @@
- 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
- #ifdef PNG_READ_INTERLACING_SUPPORTED
- PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
- 0xff};
-@@ -583,13 +678,39 @@
- {
- 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;
-@@ -607,6 +728,9 @@
- 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)
-@@ -862,6 +986,11 @@
- #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;
-
-@@ -961,6 +1090,14 @@
- 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 +1466,39 @@
- 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
-+
-+/* For png_struct.apng_flags: */
-+#define PNG_FIRST_FRAME_HIDDEN 0x0001
-+
-+/* 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 +1827,18 @@
- 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 +2083,11 @@
- 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 +2514,53 @@
- #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 +235,11 @@
- #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'}
-+#endif
-
-
- /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
-@@ -468,6 +477,17 @@
- #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 +540,20 @@
- 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 +770,25 @@
- 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 +2323,168 @@
- }
- #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 (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 +3520,73 @@
-
- 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
projects / packages / crossmingw32-libpng.git / commitdiff