[FFmpeg-cvslog] pngdec: Fix interlaced 1bpp

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Sep  6 15:28:36 2011 +0200| [dc43ad6d1a857229bb71e755a44a9765321908e1] | committer: Michael Niedermayer

pngdec: Fix interlaced 1bpp
Fixes Ticket214

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=dc43ad6d1a857229bb71e755a44a9765321908e1
---

 libavcodec/pngdec.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 0b6a62d..7ac20ae 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -57,14 +57,12 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
     dsp_mask = png_pass_dsp_mask[pass];
     switch(bits_per_pixel) {
     case 1:
-        /* we must initialize the line to zero before writing to it */
-        if (pass == 0)
-            memset(dst, 0, (width + 7) >> 3);
         src_x = 0;
         for(x = 0; x < width; x++) {
             j = (x & 7);
             if ((dsp_mask << j) & 0x80) {
                 b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
+                dst[x >> 3] &= 0xFF7F>>j;
                 dst[x >> 3] |= b << (7 - j);
             }
             if ((mask << j) & 0x80)