add APNG support patch, needed for firefox png support

2 files changed, 1643 insertions, 1 deletions

diff --git a/package/libpng/Makefile b/package/libpng/Makefile
index eb8f9e1e7..5970d0d9e 100644
--- a/package/libpng/Makefile
+++ b/package/libpng/Makefile
@@ -5,7 +5,7 @@ include ${TOPDIR}/rules.mk
 
 PKG_NAME:=		libpng
 PKG_VERSION:=		1.2.44
-PKG_RELEASE:=		1
+PKG_RELEASE:=		2
 PKG_MD5SUM:=		89b62f8daaeeab1342e307d6d1411ff1
 PKG_DESCR:=		A library for reading/writing PNG images
 PKG_SECTION:=		libs
diff --git a/package/libpng/patches/001-apng.patch b/package/libpng/patches/001-apng.patch
new file mode 100644
index 000000000..3af4a0547
--- /dev/null
+++ b/package/libpng/patches/001-apng.patch
@@ -0,0 +1,1642 @@
+diff -Nur libpng-1.2.44.orig/png.c libpng-1.2.44/png.c
+--- libpng-1.2.44.orig/png.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/png.c	2010-07-08 21:21:33.745873377 +0200
+@@ -56,6 +56,11 @@
+ PNG_tIME;
+ PNG_tRNS;
+ PNG_zTXt;
++#ifdef PNG_APNG_SUPPORTED
++PNG_acTL;
++PNG_fcTL;
++PNG_fdAT;
++#endif
+ 
+ #ifdef PNG_READ_SUPPORTED
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+diff -Nur libpng-1.2.44.orig/pngconf.h libpng-1.2.44/pngconf.h
+--- libpng-1.2.44.orig/pngconf.h	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngconf.h	2010-07-08 21:21:33.906029659 +0200
+@@ -951,6 +951,10 @@
+ #  define PNG_NO_READ_tEXt
+ #  define PNG_NO_READ_zTXt
+ #endif
++#ifndef PNG_NO_READ_APNG
++#  define PNG_READ_APNG_SUPPORTED
++#  define PNG_APNG_SUPPORTED
++#endif
+ #ifndef PNG_NO_READ_bKGD
+ #  define PNG_READ_bKGD_SUPPORTED
+ #  define PNG_bKGD_SUPPORTED
+@@ -1177,6 +1181,14 @@
+ #    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
+diff -Nur libpng-1.2.44.orig/pngget.c libpng-1.2.44/pngget.c
+--- libpng-1.2.44.orig/pngget.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngget.c	2010-07-08 21:21:33.676118515 +0200
+@@ -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,
+diff -Nur libpng-1.2.44.orig/png.h libpng-1.2.44/png.h
+--- libpng-1.2.44.orig/png.h	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/png.h	2010-07-08 21:21:33.796029652 +0200
+@@ -1041,6 +1041,19 @@
+    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;
+@@ -1142,6 +1155,10 @@
+ #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
+@@ -1182,6 +1199,10 @@
+ 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) || \
+@@ -1527,6 +1548,39 @@
+    png_uint_32 user_height_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. */
+@@ -1861,6 +1915,18 @@
+ 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
++   
+ /* Writes the end of the PNG file. */
+ extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
+    png_infop info_ptr));
+@@ -2114,6 +2180,11 @@
+    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)
+@@ -2554,6 +2625,59 @@
+ #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(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 */
++
++#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
+@@ -2918,6 +3042,10 @@
+ #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
+@@ -3060,6 +3188,11 @@
+ #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'}
++#ifdef PNG_APNG_SUPPORTED
++#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'}
++#endif
+ 
+ #ifdef PNG_USE_GLOBAL_ARRAYS
+ PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
+@@ -3083,6 +3216,11 @@
+ 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];
++#ifdef PNG_APNG_SUPPORTED
++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
+ #endif /* PNG_USE_GLOBAL_ARRAYS */
+ 
+ #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+@@ -3365,6 +3503,17 @@
+ #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)) PNG_PRIVATE;
+ 
+@@ -3417,6 +3566,20 @@
+ PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
+    png_infop info_ptr)) PNG_PRIVATE;
+ 
++#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,
+@@ -3640,6 +3803,18 @@
+    png_uint_32 length)) PNG_PRIVATE;
+ #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
++
+ PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
+    png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
+ 
+diff -Nur libpng-1.2.44.orig/pngpread.c libpng-1.2.44/pngpread.c
+--- libpng-1.2.44.orig/pngpread.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngpread.c	2010-07-08 21:21:33.947205863 +0200
+@@ -206,6 +206,11 @@
+ #ifdef PNG_READ_zTXt_SUPPORTED
+       PNG_CONST PNG_zTXt;
+ #endif
++#ifdef 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
+@@ -232,6 +237,103 @@
+       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;
+@@ -327,6 +429,9 @@
+             png_error(png_ptr, "Too many IDAT's 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;
+@@ -559,6 +664,38 @@
+    }
+ 
+ #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)
+@@ -738,13 +875,17 @@
+ png_push_read_IDAT(png_structp png_ptr)
+ {
+ #ifdef PNG_USE_LOCAL_ARRAYS
+-   PNG_CONST PNG_IDAT;
++   PNG_IDAT;
++#ifdef 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;
+@@ -756,15 +897,62 @@
+       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_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)
++#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)
+    {
+@@ -1763,6 +1951,17 @@
+    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)
+ {
+diff -Nur libpng-1.2.44.orig/pngread.c libpng-1.2.44/pngread.c
+--- libpng-1.2.44.orig/pngread.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngread.c	2010-07-08 21:21:33.676118515 +0200
+@@ -437,6 +437,11 @@
+ #ifdef PNG_READ_zTXt_SUPPORTED
+       PNG_CONST PNG_zTXt;
+ #endif
++#ifdef PNG_READ_APNG_SUPPORTED
++      PNG_CONST PNG_acTL;
++      PNG_CONST PNG_fcTL;
++      PNG_CONST PNG_fdAT;
++#endif
+ #endif /* PNG_USE_LOCAL_ARRAYS */
+       png_uint_32 length = png_read_chunk_header(png_ptr);
+       PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
+@@ -481,6 +486,9 @@
+                   !(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;
+@@ -553,12 +561,97 @@
+       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 (;;)
++    {
++#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)
+@@ -599,6 +692,10 @@
+ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
+ {
+    PNG_CONST PNG_IDAT;
++#ifdef 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};
+@@ -734,13 +831,39 @@
+    {
+       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;
+@@ -758,6 +881,9 @@
+             png_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)
+@@ -1015,6 +1141,11 @@
+ #ifdef PNG_READ_zTXt_SUPPORTED
+       PNG_CONST PNG_zTXt;
+ #endif
++#ifdef PNG_READ_APNG_SUPPORTED
++      PNG_CONST PNG_acTL;
++      PNG_CONST PNG_fcTL;
++      PNG_CONST PNG_fdAT;
++#endif
+ #endif /* PNG_USE_LOCAL_ARRAYS */
+       png_uint_32 length = png_read_chunk_header(png_ptr);
+       PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
+@@ -1115,6 +1246,14 @@
+       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));
+diff -Nur libpng-1.2.44.orig/pngrtran.c libpng-1.2.44/pngrtran.c
+--- libpng-1.2.44.orig/pngrtran.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngrtran.c	2010-07-08 21:21:34.149609181 +0200
+@@ -1352,7 +1352,7 @@
+        * 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
+diff -Nur libpng-1.2.44.orig/pngrutil.c libpng-1.2.44/pngrutil.c
+--- libpng-1.2.44.orig/pngrutil.c	2010-06-26 02:31:14.000000000 +0200
++++ libpng-1.2.44/pngrutil.c	2010-07-08 21:21:34.045873588 +0200
+@@ -460,6 +460,11 @@
+    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;
+@@ -2348,6 +2353,172 @@
+ }
+ #endif
+ 
++#ifdef PNG_READ_APNG_SUPPORTED
++void /* PRIVATE */
++png_handle_acTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
++{
++    png_byte data[8];