--- /dev/null
+Index: pngread.c
+===================================================================
+--- pngread.c (révision 144)
++++ pngread.c (copie de travail)
+@@ -399,6 +399,11 @@
+ #if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_CONST PNG_zTXt;
+ #endif
++#if defined(PNG_READ_APNG_SUPPORTED)
++ PNG_CONST PNG_acTL;
++ PNG_CONST PNG_fcTL;
++ PNG_CONST PNG_fdAT;
++#endif
+ #endif /* PNG_USE_LOCAL_ARRAYS */
+ png_byte chunk_length[4];
+ png_uint_32 length;
+@@ -452,6 +457,9 @@
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+
++#if defined(PNG_READ_APNG_SUPPORTED)
++ png_have_info(png_ptr, info_ptr);
++#endif
+ png_ptr->idat_size = length;
+ png_ptr->mode |= PNG_HAVE_IDAT;
+ break;
+@@ -524,12 +532,97 @@
+ else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ png_handle_iTXt(png_ptr, info_ptr, length);
+ #endif
++#if defined(PNG_READ_APNG_SUPPORTED)
++ else if (!png_memcmp(png_ptr->chunk_name, png_acTL, 4))
++ png_handle_acTL(png_ptr, info_ptr, length);
++ else if (!png_memcmp(png_ptr->chunk_name, png_fcTL, 4))
++ png_handle_fcTL(png_ptr, info_ptr, length);
++ else if (!png_memcmp(png_ptr->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_NO_SEQUENTIAL_READ_SUPPORTED */
+
++#if defined(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\n");
++
++ 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 (;;)
++ {
++#ifdef PNG_USE_LOCAL_ARRAYS
++ PNG_IDAT;
++ PNG_fdAT;
++ PNG_fcTL;
++#endif
++ 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)
+@@ -566,6 +659,10 @@
+ {
+ #ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_CONST PNG_IDAT;
++#if defined(PNG_READ_APNG_SUPPORTED)
++ PNG_CONST PNG_fdAT;
++ PNG_CONST 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};
+@@ -695,19 +792,46 @@
+ {
+ 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_byte chunk_length[4];
+
+- png_crc_finish(png_ptr, 0);
+-
++ png_crc_finish(png_ptr, bytes_to_skip);
++ bytes_to_skip = 0;
++
+ png_read_data(png_ptr, chunk_length, 4);
+ png_ptr->idat_size = 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))
+- png_error(png_ptr, "Not enough image data");
++
++#if defined(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");
++#if defined(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;
+@@ -725,6 +849,9 @@
+ png_error(png_ptr, "Extra compressed data");
+ png_ptr->mode |= PNG_AFTER_IDAT;
+ png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
++#if defined(PNG_READ_APNG_SUPPORTED)
++ png_ptr->num_frames_read++;
++#endif
+ break;
+ }
+ if (ret != Z_OK)
+@@ -979,6 +1106,11 @@
+ #if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_CONST PNG_zTXt;
+ #endif
++#if defined(PNG_READ_APNG_SUPPORTED)
++ PNG_CONST PNG_acTL;
++ PNG_CONST PNG_fcTL;
++ PNG_CONST PNG_fdAT;
++#endif
+ #endif /* PNG_USE_LOCAL_ARRAYS */
+
+ png_read_data(png_ptr, chunk_length, 4);
+@@ -1085,6 +1217,14 @@
+ else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ png_handle_iTXt(png_ptr, info_ptr, length);
+ #endif
++#if defined(PNG_READ_APNG_SUPPORTED)
++ else if (!png_memcmp(png_ptr->chunk_name, png_acTL, 4))
++ png_handle_acTL(png_ptr, info_ptr, length);
++ else if (!png_memcmp(png_ptr->chunk_name, png_fcTL, 4))
++ png_handle_fcTL(png_ptr, info_ptr, length);
++ else if (!png_memcmp(png_ptr->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: png.c
+===================================================================
+--- png.c (révision 144)
++++ png.c (copie de travail)
+@@ -51,6 +51,9 @@
+ PNG_tIME;
+ PNG_tRNS;
+ PNG_zTXt;
++PNG_acTL;
++PNG_fcTL;
++PNG_fdAT;
+
+ #ifdef PNG_READ_SUPPORTED
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+Index: pngget.c
+===================================================================
+--- pngget.c (révision 144)
++++ pngget.c (copie de travail)
+@@ -797,6 +797,167 @@
+ }
+ #endif
+
++#if defined(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\n", "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()\n");
++
++ 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()\n");
++
++ 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\n", "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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ 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()\n");
++
++ if (png_ptr != NULL)
++ return (png_byte)(png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN);
++
++ return 0;
++}
++#endif /* PNG_APNG_SUPPORTED */
++
+ #if defined(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 (révision 144)
++++ png.h (copie de travail)
+@@ -947,6 +947,19 @@
+ png_fixed_point int_y_blue;
+ #endif
+
++#if defined(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;
+@@ -1048,6 +1061,8 @@
+ #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 */
++#define PNG_INFO_acTL 0x10000L
++#define PNG_INFO_fcTL 0x20000L
+
+ /* This is used for the transformation routines, as some of them
+ * change these values for the row. It also should enable using
+@@ -1088,7 +1103,11 @@
+ 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));
++#if defined(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) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+@@ -1419,6 +1438,39 @@
+ png_uint_32 user_height_max;
+ #endif
+
++#if defined(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;
++
++#if defined(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
++
++#if defined(PNG_WRITE_APNG_SUPPORTED)
++ png_uint_32 num_frames_to_write;
++ png_uint_32 num_frames_written;
++#endif
++#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
++
+ /* New member added in libpng-1.0.25 and 1.2.17 */
+ #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ /* storage for unknown chunk that the library doesn't recognize. */
+@@ -1745,6 +1797,18 @@
+ extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
+ png_bytepp image));
+
++#if defined(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
++
+ /* writes the end of the PNG file. */
+ extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+@@ -1993,6 +2057,11 @@
+ png_voidp progressive_ptr,
+ png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
+ png_progressive_end_ptr end_fn));
++#if defined(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)
+@@ -2430,6 +2499,59 @@
+ #endif
+ #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
+
++#if defined(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(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));
++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 */
++
++#if defined(PNG_READ_APNG_SUPPORTED)
++extern PNG_EXPORT(void,png_read_frame_head) PNGARG((png_structp png_ptr,
++ png_infop info_ptr));
++#endif
++
+ #if defined(PNG_UNKNOWN_CHUNKS_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
+@@ -2736,6 +2858,8 @@
+ #define PNG_BACKGROUND_IS_GRAY 0x800
+ #define PNG_HAVE_PNG_SIGNATURE 0x1000
+ #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
++#define PNG_HAVE_acTL 0x4000
++#define PNG_HAVE_fcTL 0x8000L
+
+ /* flags for the transformations the PNG library does on the image data */
+ #define PNG_BGR 0x0001
+@@ -2876,6 +3000,9 @@
+ #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
+ #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
+ #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
++#define PNG_acTL png_byte png_acTL[5] = { 97, 99, 84, 76, '\0'}
++#define PNG_fcTL png_byte png_fcTL[5] = {102, 99, 84, 76, '\0'}
++#define PNG_fdAT png_byte png_fdAT[5] = {102, 100, 65, 84, '\0'}
+
+ #ifdef PNG_USE_GLOBAL_ARRAYS
+ PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
+@@ -2899,6 +3026,9 @@
+ PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
+ PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
+ PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
++PNG_EXPORT_VAR (png_byte FARDATA) png_acTL[5];
++PNG_EXPORT_VAR (png_byte FARDATA) png_fcTL[5];
++PNG_EXPORT_VAR (png_byte FARDATA) png_fdAT[5];
+ #endif /* PNG_USE_GLOBAL_ARRAYS */
+
+ #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+@@ -3173,6 +3303,17 @@
+ #endif
+ #endif
+
++#if defined(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));
+
+@@ -3224,6 +3365,20 @@
+ PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+
++#if defined(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
++#if defined(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 */
+ #if defined(PNG_READ_FILLER_SUPPORTED)
+ PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
+@@ -3439,6 +3594,18 @@
+ png_uint_32 length));
+ #endif
+
++#if defined(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
++
+ PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 length));
+
+Index: pngtrans.c
+===================================================================
+--- pngtrans.c (révision 144)
++++ pngtrans.c (copie de travail)
+@@ -652,11 +652,10 @@
+ png_voidp PNGAPI
+ png_get_user_transform_ptr(png_structp png_ptr)
+ {
+-#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ if (png_ptr == NULL) return (NULL);
++#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ return ((png_voidp)png_ptr->user_transform_ptr);
+-#else
+- return (NULL);
+ #endif
++ return (NULL);
+ }
+ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
+Index: pngconf.h
+===================================================================
+--- pngconf.h (révision 144)
++++ pngconf.h (copie de travail)
+@@ -925,6 +925,10 @@
+ # define PNG_READ_zTXt_SUPPORTED
+ # define PNG_zTXt_SUPPORTED
+ #endif
++#ifndef PNG_NO_READ_APNG
++# define PNG_READ_APNG_SUPPORTED
++# define PNG_APNG_SUPPORTED
++#endif
+ #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
+ # define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+ # ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+@@ -1067,6 +1071,12 @@
+ # define PNG_zTXt_SUPPORTED
+ # endif
+ #endif
++#ifndef PNG_NO_WRITE_APNG
++# define PNG_WRITE_APNG_SUPPORTED
++# ifndef PNG_APNG_SUPPORTED
++# define PNG_APNG_SUPPORTED
++# endif
++#endif
+ #ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
+ # define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+ # ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+Index: pngwrite.c
+===================================================================
+--- pngwrite.c (révision 144)
++++ pngwrite.c (copie de travail)
+@@ -261,6 +261,10 @@
+ }
+ }
+ #endif
++#if defined(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
+ #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+@@ -299,6 +303,10 @@
+ return;
+ if (!(png_ptr->mode & PNG_HAVE_IDAT))
+ png_error(png_ptr, "No IDATs written into file");
++#if defined(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)
+@@ -1513,4 +1521,39 @@
+ params = params;
+ }
+ #endif
++
++#if defined(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\n");
++
++ /* 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\n");
++
++ png_ptr->num_frames_written++;
++}
++#endif /* PNG_WRITE_APNG_SUPPORTED */
++
+ #endif /* PNG_WRITE_SUPPORTED */
+Index: pngset.c
+===================================================================
+--- pngset.c (révision 144)
++++ pngset.c (copie de travail)
+@@ -364,6 +364,11 @@
+ info_ptr->rowbytes = (png_size_t)0;
+ else
+ info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
++
++#if defined(PNG_APNG_SUPPORTED)
++ /* for non-animated png. this may be overritten from an acTL chunk later */
++ info_ptr->num_frames = 1;
++#endif
+ }
+
+ #if defined(PNG_oFFs_SUPPORTED)
+@@ -1009,6 +1014,141 @@
+ }
+ #endif /* PNG_sPLT_SUPPORTED */
+
++#if defined(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\n", "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\n", "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);
++
++ 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");
++
++ if (blend_op == PNG_BLEND_OP_OVER) {
++ if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
++ png_error(png_ptr, "PNG_BLEND_OP_OVER is not valid for "
++ "color type 'greyscale without alpha'");
++ else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) &&
++ !(png_ptr->color_type & PNG_COLOR_MASK_ALPHA))
++ png_error(png_ptr, "PNG_BLEND_OP_OVER is not valid for "
++ "color type 'truecolor without alpha'");
++ }
++}
++
++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()\n");
++
++ 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 */
++
+ #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ void PNGAPI
+ png_set_unknown_chunks(png_structp png_ptr,
+Index: pngpread.c
+===================================================================
+--- pngpread.c (révision 144)
++++ pngpread.c (copie de travail)
+@@ -192,6 +192,11 @@
+ #if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_CONST PNG_zTXt;
+ #endif
++#if defined(PNG_READ_APNG_SUPPORTED)
++ PNG_CONST PNG_acTL;
++ PNG_CONST PNG_fcTL;
++ PNG_CONST PNG_fdAT;
++#endif
+ #endif /* PNG_USE_LOCAL_ARRAYS */
+ /* 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
+@@ -215,7 +220,104 @@
+ png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+ png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
+ }
+-
++
++#if defined(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;
+@@ -295,6 +397,9 @@
+ png_error(png_ptr, "Too many IDAT's found");
+ }
+
++#if defined(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;
+@@ -490,6 +595,35 @@
+ png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
+ }
+ #endif
++#if defined(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)
+@@ -660,13 +794,17 @@
+ png_push_read_IDAT(png_structp png_ptr)
+ {
+ #ifdef PNG_USE_LOCAL_ARRAYS
+- PNG_CONST PNG_IDAT;
++ PNG_IDAT;
++#if defined(PNG_READ_APNG_SUPPORTED)
++ PNG_fdAT;
++ PNG_IEND;
+ #endif
++#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;
+@@ -678,15 +816,59 @@
+ 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))
++#if defined(PNG_READ_APNG_SUPPORTED)
++ if (png_memcmp(png_ptr->chunk_name, (png_bytep)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)
++ && (png_ptr->num_frames_read == 0) )
++ {
+ png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+ if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
+ png_error(png_ptr, "Not enough compressed data");
++#if defined(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;
++
++#if defined(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)
+ {
+@@ -1577,6 +1759,17 @@
+ png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
+ }
+
++#if defined(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: pngrutil.c
+===================================================================
+--- pngrutil.c (révision 144)
++++ pngrutil.c (copie de travail)
+@@ -374,6 +374,11 @@
+ filter_type = buf[11];
+ interlace_type = buf[12];
+
++#if defined(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;
+@@ -2175,6 +2180,168 @@
+ }
+ #endif
+
++#if defined(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\n");
++
++ 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\n");
++
++ 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);
++ 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);
++ return;
++ }
++ else if (length != 26)
++ {
++ png_warning(png_ptr, "fcTL with invalid length skipped");
++ png_crc_finish(png_ptr, length);
++ return;
++ }
++
++ png_ensure_sequence_number(png_ptr, length);
++
++ 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
+@@ -3138,8 +3305,10 @@
+ if (row_bytes > (png_uint_32)65536L)
+ png_error(png_ptr, "This image requires a row greater than 64KB");
+ #endif
+- png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
+- png_ptr->row_buf = png_ptr->big_row_buf+32;
++ if (png_ptr->big_row_buf == NULL)
++ png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
++ if (png_ptr->row_buf == NULL)
++ png_ptr->row_buf = png_ptr->big_row_buf+32;
+
+ #ifdef PNG_MAX_MALLOC_64K
+ if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
+@@ -3161,4 +3330,82 @@
+
+ png_ptr->flags |= PNG_FLAG_ROW_INIT;
+ }
++
++#if defined(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);
++}
++
++/* same as png_read_reset() but for the progressive reader */
++void /* PRIVATE */
++png_progressive_read_reset(png_structp png_ptr)
++{
++#ifdef PNG_USE_LOCAL_ARRAYS
++ /* 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};
++#endif
++ png_uint_32 row_bytes;
++
++ 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];
++
++ row_bytes = PNG_ROWBYTES(png_ptr->pixel_depth,png_ptr->iwidth) + 1;
++
++ png_ptr->irowbytes = (png_size_t)row_bytes;
++ if((png_uint_32)png_ptr->irowbytes != row_bytes)
++ png_error(png_ptr, "png_progressive_read_reset(): Rowbytes "
++ "overflow");
++ }
++ else
++ {
++ png_ptr->num_rows = png_ptr->height;
++ png_ptr->iwidth = png_ptr->width;
++ png_ptr->irowbytes = png_ptr->rowbytes + 1;
++ }
++
++ 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_ptr->irowbytes;
++}
++#endif /* PNG_READ_APNG_SUPPORTED */
+ #endif /* PNG_READ_SUPPORTED */
+Index: pngwutil.c
+===================================================================
+--- pngwutil.c (révision 144)
++++ pngwutil.c (copie de travail)
+@@ -496,6 +496,11 @@
+ /* write the chunk */
+ png_write_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
+
++#if defined(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;
+@@ -608,7 +613,10 @@
+ {
+ #ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
++#if defined(PNG_WRITE_APNG_SUPPORTED)
++ PNG_fdAT;
+ #endif
++#endif
+ png_debug(1, "in png_write_IDAT\n");
+
+ /* Optimize the CMF field in the zlib stream. */
+@@ -650,7 +658,28 @@
+ "Invalid zlib compression method or flags in IDAT");
+ }
+
+- png_write_chunk(png_ptr, png_IDAT, data, length);
++#if defined(PNG_WRITE_APNG_SUPPORTED)
++ if(png_ptr->num_frames_written == 0)
++#endif
++ png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
++#if defined(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;
+ }
+
+@@ -662,7 +691,7 @@
+ PNG_IEND;
+ #endif
+ png_debug(1, "in png_write_IEND\n");
+- png_write_chunk(png_ptr, png_IEND, png_bytep_NULL,
++ png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+ (png_size_t)0);
+ png_ptr->mode |= PNG_HAVE_IEND;
+ }
+@@ -1722,6 +1751,70 @@
+ }
+ #endif
+
++#if defined(PNG_WRITE_APNG_SUPPORTED)
++void /* PRIVATE */
++png_write_acTL(png_structp png_ptr,
++ png_uint_32 num_frames, png_uint_32 num_plays)
++{
++#ifdef PNG_USE_LOCAL_ARRAYS
++ PNG_acTL;
++#endif
++ png_byte data[16];
++
++ png_debug(1, "in png_write_acTL\n");
++
++ 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)
++{
++#ifdef PNG_USE_LOCAL_ARRAYS
++ PNG_fcTL;
++#endif
++ png_byte data[26];
++
++ png_debug(1, "in png_write_fcTL\n");
++
++ 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\n");
++ 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\n");
++
++ /* 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)
+@@ -2789,4 +2882,39 @@
+ }
+ #endif
+ }
++
++#if defined(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\n");
++ 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 (révision 144)
++++ pngrtran.c (copie de travail)
+@@ -1278,7 +1278,7 @@
+ * or png_read_update_info() after setting transforms that expand
+ * 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