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pngdec: implement 4bpp interlaced

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Fixes Ticket435

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-06 19:02:14 +02:00
parent dcabb3d608
commit 0c9cba24b7
1 changed files with 14 additions and 0 deletions
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14
libavcodec/pngdec.c
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@ -83,6 +83,20 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
src_x++;
}
break;
case 4:
src_x = 0;
for(x = 0; x < width; x++) {
int j2 = 4*(x&1);
j = (x & 7);
if ((dsp_mask << j) & 0x80) {
b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
dst[x >> 1] &= 0xFF0F>>j2;
dst[x >> 1] |= b << (4 - j2);
}
if ((mask << j) & 0x80)
src_x++;
}
break;
default:
bpp = bits_per_pixel >> 3;
d = dst;