Index: pngread.c =================================================================== --- pngread.c +++ pngread.c @@ -423,6 +423,11 @@ #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; @@ -467,6 +472,9 @@ !(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; @@ -539,12 +547,97 @@ 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) @@ -584,6 +677,10 @@ 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}; @@ -716,13 +813,39 @@ { 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; @@ -740,6 +863,9 @@ 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) @@ -997,6 +1123,11 @@ #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; @@ -1097,6 +1228,14 @@ 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.c =================================================================== --- png.c +++ png.c @@ -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 */ Index: png.h =================================================================== --- png.h +++ png.h @@ -1029,6 +1029,19 @@ 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; @@ -1130,6 +1143,10 @@ #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 @@ -1170,6 +1187,10 @@ 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) || \ @@ -1506,6 +1527,39 @@ 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. */ @@ -1840,6 +1894,18 @@ 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)); @@ -2093,6 +2159,11 @@ 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) @@ -2533,6 +2604,59 @@ #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 @@ -2897,6 +3021,10 @@ #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 @@ -3039,6 +3167,11 @@ #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]; @@ -3062,6 +3195,11 @@ 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) @@ -3344,6 +3482,17 @@ #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; @@ -3396,6 +3545,20 @@ 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, @@ -3619,6 +3782,18 @@ 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; Index: pngwrite.c =================================================================== --- pngwrite.c +++ pngwrite.c @@ -56,6 +56,10 @@ /* 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) { @@ -318,6 +322,10 @@ 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) @@ -1582,4 +1590,39 @@ 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 @@ -756,7 +756,6 @@ #endif /* PNG_WRITE_SUPPORTED */ -#define PNG_NO_ERROR_NUMBERS #ifndef PNG_1_0_X # ifndef PNG_NO_ERROR_NUMBERS # define PNG_ERROR_NUMBERS_SUPPORTED @@ -944,6 +943,10 @@ # 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 @@ -1170,6 +1173,14 @@ # 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 @@ -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; @@ -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) @@ -731,13 +868,17 @@ 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; @@ -749,15 +890,62 @@ 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) { @@ -1719,6 +1907,17 @@ 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 @@ -266,6 +266,11 @@ info_ptr->rowbytes = (png_size_t)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 @@ -960,6 +965,142 @@ } #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_HANDLE_AS_UNKNOWN_SUPPORTED void PNGAPI png_set_unknown_chunks(png_structp png_ptr, Index: pngrutil.c =================================================================== --- pngrutil.c +++ pngrutil.c @@ -425,6 +425,11 @@ 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; @@ -2227,6 +2232,168 @@ } #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"); + + 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 @@ -3240,4 +3407,84 @@ 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_check(png_ptr, 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) +{ +#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 +++ pngwutil.c @@ -515,6 +515,11 @@ /* 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; @@ -638,6 +643,9 @@ { #ifdef PNG_USE_LOCAL_ARRAYS PNG_IDAT; +#ifdef PNG_WRITE_APNG_SUPPORTED + PNG_fdAT; +#endif #endif png_debug(1, "in png_write_IDAT"); @@ -683,7 +691,28 @@ "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; } @@ -1750,6 +1779,70 @@ } #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) +{ +#ifdef PNG_USE_LOCAL_ARRAYS + PNG_acTL; +#endif + 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) +{ +#ifdef PNG_USE_LOCAL_ARRAYS + PNG_fcTL; +#endif + 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) @@ -2155,8 +2248,8 @@ #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 @@ -2825,4 +2918,39 @@ } #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 @@ -1346,7 +1346,7 @@ * 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