diff options
Diffstat (limited to 'src/3rdparty/libpng/example.c')
| -rw-r--r-- | src/3rdparty/libpng/example.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/3rdparty/libpng/example.c b/src/3rdparty/libpng/example.c index cd3682f..c0d27f4 100644 --- a/src/3rdparty/libpng/example.c +++ b/src/3rdparty/libpng/example.c @@ -2,7 +2,7 @@ #if 0 /* in case someone actually tries to compile this */ /* example.c - an example of using libpng - * Last changed in libpng 1.5.0 [January 6, 2011] + * Last changed in libpng 1.5.4 [July 7, 2011] * This file has been placed in the public domain by the authors. * Maintained 1998-2011 Glenn Randers-Pehrson * Maintained 1996, 1997 Andreas Dilger) @@ -22,6 +22,10 @@ * see also the programs in the contrib directory. */ +#define _POSIX_SOURCE 1 /* libpng and zlib are POSIX-compliant. You may + * change this if your application uses non-POSIX + * extensions. */ + #include "png.h" /* The png_jmpbuf() macro, used in error handling, became available in @@ -183,8 +187,15 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */ * are mutually exclusive. */ - /* Tell libpng to strip 16 bit/color files down to 8 bits/color */ + /* Tell libpng to strip 16 bit/color files down to 8 bits/color. + * Use accurate scaling if it's available, otherwise just chop off the + * low byte. + */ +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED + png_set_scale_16(png_ptr); +#else png_set_strip_16(png_ptr); +#endif /* Strip alpha bytes from the input data without combining with the * background (not recommended). |