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Code Issues Releases Activity

pngdec: Fix interlaced 1bpp

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Fixes Ticket214

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-06 15:28:36 +02:00
parent 738219c921
commit dc43ad6d1a
1 changed files with 1 additions and 3 deletions
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4
libavcodec/pngdec.c
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@ -57,14 +57,12 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
dsp_mask = png_pass_dsp_mask[pass]; dsp_mask = png_pass_dsp_mask[pass];
switch(bits_per_pixel) { switch(bits_per_pixel) {
case 1: 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; src_x = 0;
for(x = 0; x < width; x++) { for(x = 0; x < width; x++) {
j = (x & 7); j = (x & 7);
if ((dsp_mask << j) & 0x80) { if ((dsp_mask << j) & 0x80) {
b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1; b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
dst[x >> 3] &= 0xFF7F>>j;
dst[x >> 3] |= b << (7 - j); dst[x >> 3] |= b << (7 - j);
} }
if ((mask << j) & 0x80) if ((mask << j) & 0x80)