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png: disable broken MMX/SIMD code for bpp <= 2

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The decoder was producing different results when ASM was disabled.
Based on a long debug session with Kostya.
This commit is contained in:
Vittorio Giovara
2014-08-01 19:13:55 +01:00
parent f84a1b597c
commit 2257165bff
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pngdec.c
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@@ -240,7 +240,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
p = last[i]; p = last[i];
dst[i] = p + src[i]; dst[i] = p + src[i];
} }
if (bpp > 1 && size > 4) { if (bpp > 2 && size > 4) {
/* would write off the end of the array if we let it process /* would write off the end of the array if we let it process
* the last pixel with bpp=3 */ * the last pixel with bpp=3 */
int w = bpp == 4 ? size : size - 3; int w = bpp == 4 ? size : size - 3;