diff options
Diffstat (limited to 'thirdparty/libpng/pngwutil.c')
-rw-r--r-- | thirdparty/libpng/pngwutil.c | 177 |
1 files changed, 156 insertions, 21 deletions
diff --git a/thirdparty/libpng/pngwutil.c b/thirdparty/libpng/pngwutil.c index ab431e712c..b4809cda6b 100644 --- a/thirdparty/libpng/pngwutil.c +++ b/thirdparty/libpng/pngwutil.c @@ -1,10 +1,10 @@ /* pngwutil.c - utilities to write a PNG file * - * Last changed in libpng 1.6.35 [July 15, 2018] + * Copyright (c) 2018 Cosmin Truta * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson - * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) - * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * Copyright (c) 1996-1997 Andreas Dilger + * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer @@ -821,6 +821,11 @@ png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, /* Write the chunk */ png_write_complete_chunk(png_ptr, png_IHDR, buf, 13); +#ifdef PNG_WRITE_APNG_SUPPORTED + png_ptr->first_frame_width = width; + png_ptr->first_frame_height = height; +#endif + if ((png_ptr->do_filter) == PNG_NO_FILTERS) { if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || @@ -1002,8 +1007,17 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, optimize_cmf(data, png_image_size(png_ptr)); #endif - if (size > 0) - png_write_complete_chunk(png_ptr, png_IDAT, data, size); + if (size > 0) +#ifdef PNG_WRITE_APNG_SUPPORTED + { + if (png_ptr->num_frames_written == 0) +#endif + png_write_complete_chunk(png_ptr, png_IDAT, data, size); +#ifdef PNG_WRITE_APNG_SUPPORTED + else + png_write_fdAT(png_ptr, data, size); + } +#endif /* PNG_WRITE_APNG_SUPPORTED */ png_ptr->mode |= PNG_HAVE_IDAT; png_ptr->zstream.next_out = data; @@ -1050,7 +1064,17 @@ png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, #endif if (size > 0) +#ifdef PNG_WRITE_APNG_SUPPORTED + { + if (png_ptr->num_frames_written == 0) +#endif png_write_complete_chunk(png_ptr, png_IDAT, data, size); +#ifdef PNG_WRITE_APNG_SUPPORTED + else + png_write_fdAT(png_ptr, data, size); + } +#endif /* PNG_WRITE_APNG_SUPPORTED */ + png_ptr->zstream.avail_out = 0; png_ptr->zstream.next_out = NULL; png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; @@ -1885,6 +1909,82 @@ png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) } #endif +#ifdef PNG_WRITE_APNG_SUPPORTED +void /* PRIVATE */ +png_write_acTL(png_structp png_ptr, + png_uint_32 num_frames, png_uint_32 num_plays) +{ + png_byte buf[8]; + + 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(buf, num_frames); + png_save_uint_32(buf + 4, num_plays); + + png_write_complete_chunk(png_ptr, png_acTL, buf, (png_size_t)8); +} + +void /* PRIVATE */ +png_write_fcTL(png_structp png_ptr, png_uint_32 width, png_uint_32 height, + png_uint_32 x_offset, png_uint_32 y_offset, + png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op, + png_byte blend_op) +{ + png_byte buf[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(buf, png_ptr->next_seq_num); + png_save_uint_32(buf + 4, width); + png_save_uint_32(buf + 8, height); + png_save_uint_32(buf + 12, x_offset); + png_save_uint_32(buf + 16, y_offset); + png_save_uint_16(buf + 20, delay_num); + png_save_uint_16(buf + 22, delay_den); + buf[24] = dispose_op; + buf[25] = blend_op; + + png_write_complete_chunk(png_ptr, png_fcTL, buf, (png_size_t)26); + + png_ptr->next_seq_num++; +} + +void /* PRIVATE */ +png_write_fdAT(png_structp png_ptr, + png_const_bytep data, png_size_t length) +{ + png_byte buf[4]; + + png_write_chunk_header(png_ptr, png_fdAT, (png_uint_32)(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_WRITE_APNG_SUPPORTED */ + /* Initializes the row writing capability of libpng */ void /* PRIVATE */ png_write_start_row(png_structrp png_ptr) @@ -1893,16 +1993,16 @@ png_write_start_row(png_structrp png_ptr) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif png_alloc_size_t buf_size; @@ -2008,16 +2108,16 @@ png_write_finish_row(png_structrp png_ptr) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif png_debug(1, "in png_write_finish_row"); @@ -2098,10 +2198,10 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; png_debug(1, "in png_do_write_interlace"); @@ -2276,7 +2376,7 @@ png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, #ifdef PNG_WRITE_FILTER_SUPPORTED static size_t /* PRIVATE */ -png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_sub_row(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes, size_t lmins) { png_bytep rp, dp, lp; @@ -2315,7 +2415,7 @@ png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp, } static void /* PRIVATE */ -png_setup_sub_row_only(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_sub_row_only(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes) { png_bytep rp, dp, lp; @@ -2380,7 +2480,7 @@ png_setup_up_row_only(png_structrp png_ptr, size_t row_bytes) } static size_t /* PRIVATE */ -png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_avg_row(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes, size_t lmins) { png_bytep rp, dp, pp, lp; @@ -2420,7 +2520,7 @@ png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp, return (sum); } static void /* PRIVATE */ -png_setup_avg_row_only(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_avg_row_only(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes) { png_bytep rp, dp, pp, lp; @@ -2442,7 +2542,7 @@ png_setup_avg_row_only(png_structrp png_ptr, const png_uint_32 bpp, } static size_t /* PRIVATE */ -png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_paeth_row(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes, size_t lmins) { png_bytep rp, dp, pp, cp, lp; @@ -2503,7 +2603,7 @@ png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp, return (sum); } static void /* PRIVATE */ -png_setup_paeth_row_only(png_structrp png_ptr, const png_uint_32 bpp, +png_setup_paeth_row_only(png_structrp png_ptr, png_uint_32 bpp, size_t row_bytes) { png_bytep rp, dp, pp, cp, lp; @@ -2778,4 +2878,39 @@ png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, } #endif /* WRITE_FLUSH */ } + +#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 /* PNG_WRITE_APNG_SUPPORTED */ #endif /* WRITE */ |