From 2257165bff243534982f4ddabae4e65e2a35f2ab Mon Sep 17 00:00:00 2001
From: Vittorio Giovara <vittorio.giovara@gmail.com>
Date: Fri, 1 Aug 2014 19:13:55 +0100
Subject: png: disable broken MMX/SIMD code for bpp <= 2

The decoder was producing different results when ASM was disabled.
Based on a long debug session with Kostya.
---
 libavcodec/pngdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'libavcodec/pngdec.c')

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 7bc2ad4847..0c4c91a612 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -240,7 +240,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
             p      = last[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
              * the last pixel with bpp=3 */
             int w = bpp == 4 ? size : size - 3;
-- 
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