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pngdec: implement 2 bpp interlaced.

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Fixes Ticket434

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-06 18:46:42 +02:00
parent 4f7dfe12ea
commit dcabb3d608
1 changed files with 14 additions and 0 deletions
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14
libavcodec/pngdec.c
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@ -69,6 +69,20 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
src_x++;
}
break;
case 2:
src_x = 0;
for(x = 0; x < width; x++) {
int j2 = 2*(x&3);
j = (x & 7);
if ((dsp_mask << j) & 0x80) {
b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
dst[x >> 2] &= 0xFF3F>>j2;
dst[x >> 2] |= b << (6 - j2);
}
if ((mask << j) & 0x80)
src_x++;
}
break;
default:
bpp = bits_per_pixel >> 3;
d = dst;