diff options
Diffstat (limited to 'pngrutil.c')
| -rw-r--r-- | pngrutil.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/pngrutil.c b/pngrutil.c index 0a75cd81c..587feb8a4 100644 --- a/pngrutil.c +++ b/pngrutil.c @@ -1,7 +1,7 @@ /* pngrutil.c - utilities to read a PNG file * - * Last changed in libpng 1.6.3 [July 18, 2013] + * Last changed in libpng 1.6.4 [September 12, 2013] * Copyright (c) 1998-2013 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.) @@ -2764,7 +2764,6 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, png_debug(1, "in png_handle_unknown"); -#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing * the bug which meant that setting a non-default behavior for a specific * chunk would be ignored (the default was always used unless a user @@ -2776,16 +2775,15 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, * This is just an optimization to avoid multiple calls to the lookup * function. */ -# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED - keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name); -# endif +# ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name); # endif /* One of the following methods will read the chunk or skip it (at least one * of these is always defined because this is the only way to switch on * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) */ +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED # ifdef PNG_READ_USER_CHUNKS_SUPPORTED /* The user callback takes precedence over the chunk keep value, but the * keep value is still required to validate a save of a critical chunk. @@ -2893,7 +2891,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, png_crc_finish(png_ptr, length); } -# endif +# endif /* PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED */ # ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED /* Now store the chunk in the chunk list if appropriate, and if the limits @@ -3880,7 +3878,8 @@ png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row, static void png_init_filter_functions(png_structrp pp) - /* This function is called once for every PNG image to set the + /* This function is called once for every PNG image (except for PNG images + * that only use PNG_FILTER_VALUE_NONE for all rows) to set the * implementations required to reverse the filtering of PNG rows. Reversing * the filter is the first transformation performed on the row data. It is * performed in place, therefore an implementation can be selected based on @@ -3922,10 +3921,13 @@ png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row, * PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic * implementations. See png_init_filter_functions above. */ - if (pp->read_filter[0] == NULL) - png_init_filter_functions(pp); if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST) + { + if (pp->read_filter[0] == NULL) + png_init_filter_functions(pp); + pp->read_filter[filter-1](row_info, row, prev_row); + } } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |