diff options
Diffstat (limited to 'Build/source/libs/libpng/pngrtran.c')
| -rw-r--r-- | Build/source/libs/libpng/pngrtran.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/Build/source/libs/libpng/pngrtran.c b/Build/source/libs/libpng/pngrtran.c index cda392154e5..c020b51b3d2 100644 --- a/Build/source/libs/libpng/pngrtran.c +++ b/Build/source/libs/libpng/pngrtran.c @@ -1,9 +1,9 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.2.22 [October 13, 2007] + * Last changed in libpng 1.2.25 [February 18, 2008] * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2007 Glenn Randers-Pehrson + * Copyright (c) 1998-2008 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.) * @@ -964,6 +964,14 @@ png_init_read_transformations(png_structp png_ptr) palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } } + /* Prevent the transformations being done again, and make sure + * that the now spurious alpha channel is stripped - the code + * has just reduced background composition and gamma correction + * to a simply alpha channel strip. + */ + png_ptr->transformations &= ~PNG_BACKGROUND; + png_ptr->transformations &= ~PNG_GAMMA; + png_ptr->transformations |= PNG_STRIP_ALPHA; } /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ else @@ -1038,6 +1046,9 @@ png_init_read_transformations(png_structp png_ptr) palette[i].green = png_ptr->gamma_table[palette[i].green]; palette[i].blue = png_ptr->gamma_table[palette[i].blue]; } + + /* Done the gamma correction. */ + png_ptr->transformations &= ~PNG_GAMMA; } } #if defined(PNG_READ_BACKGROUND_SUPPORTED) @@ -1075,6 +1086,10 @@ png_init_read_transformations(png_structp png_ptr) png_ptr->trans[i], back.blue); } } + + /* Handled alpha, still need to strip the channel. */ + png_ptr->transformations &= ~PNG_BACKGROUND; + png_ptr->transformations |= PNG_STRIP_ALPHA; } #endif /* PNG_READ_BACKGROUND_SUPPORTED */ |