diff options
author | Glenn Randers-Pehrson <glennrp at users.sourceforge.net> | 2015-05-30 11:54:45 -0500 |
---|---|---|
committer | Glenn Randers-Pehrson <glennrp at users.sourceforge.net> | 2015-05-30 11:54:45 -0500 |
commit | e6877671f1b4f4f382f211720c9b648eb9b86c50 (patch) | |
tree | bd0a843a8c30a356d132a4604344b9b32df906d1 /pngstruct.h | |
parent | 9fbdce8fb5a227b18e392e1603be0214a29fc569 (diff) | |
download | libpng-e6877671f1b4f4f382f211720c9b648eb9b86c50.tar.gz |
[libpng16] Backported filter selection code from libpng-1.7.0beta51, to combine
sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
Diffstat (limited to 'pngstruct.h')
-rw-r--r-- | pngstruct.h | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/pngstruct.h b/pngstruct.h index 8420d0997..4d34ac05b 100644 --- a/pngstruct.h +++ b/pngstruct.h @@ -219,16 +219,18 @@ struct png_struct_def png_uint_32 row_number; /* current row in interlace pass */ png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ png_bytep prev_row; /* buffer to save previous (unfiltered) row. - * This is a pointer into big_prev_row + * While reading this is a pointer into + * big_prev_row; while writing it is separately + * allocated if needed. */ png_bytep row_buf; /* buffer to save current (unfiltered) row. - * This is a pointer into big_row_buf + * While reading, this is a pointer into + * big_row_buf; while writing it is separately + * allocated. */ -#ifdef PNG_WRITE_SUPPORTED - png_bytep sub_row; /* buffer to save "sub" row when filtering */ - png_bytep up_row; /* buffer to save "up" row when filtering */ - png_bytep avg_row; /* buffer to save "avg" row when filtering */ - png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ +#ifdef PNG_WRITE_FILTER_SUPPORTED + png_bytep try_row; /* buffer to save trial row when filtering */ + png_bytep tst_row; /* buffer to save best trial row when filtering */ #endif png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ |