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Fix decoding some 1bpp tiff files, they are palettized. 

Fixes ticket #830.
This commit is contained in:
Carl Eugen Hoyos 2011-12-31 02:00:33 +01:00
parent e767968c6e
commit 7ee0649f95
1 changed files with 19 additions and 8 deletions
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27
libavcodec/tiff.c
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@ -107,6 +107,18 @@ static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
uint8_t c, int width, int offset)
{
switch (bpp) {
case 1:
while (--width >= 0) {
dst[(width+offset)*8+7] = (usePtr ? src[width] : c) & 0x1;
dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;
dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;
dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;
dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;
dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;
dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;
dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;
}
break;
case 2:
while (--width >= 0) {
dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;
@ -149,11 +161,7 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
}
src = zbuf;
for(line = 0; line < lines; line++){
if(s->bpp == 4){
horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
}else{
memcpy(dst, src, width);
}
horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
dst += stride;
src += width;
}
@ -194,6 +202,11 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts);
break;
}
if (s->bpp < 8)
for (line = 0; line < lines; line++) {
horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
dst += stride;
}
av_free(src2);
return ret;
}
@ -245,7 +258,7 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
return -1;
}
if(s->bpp == 4)
if (s->bpp < 8)
horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
break;
}
@ -261,8 +274,6 @@ static int init_image(TiffContext *s)
switch (s->bpp * 10 + s->bppcount) {
case 11:
s->avctx->pix_fmt = PIX_FMT_MONOBLACK;
break;
case 21:
case 41:
case 81: