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synced 2024-09-02 06:23:23 +02:00
Support LZW and ZLIB compressed 4bpp tiff samples.
Fixes ticket #439 and ticket #440.
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@ -129,6 +129,16 @@ static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
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}
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}
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static void av_always_inline split_nibbles(uint8_t *dst, const uint8_t *src,
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int width)
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{
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while (--width >= 0) {
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// src == dst for LZW
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dst[width * 2 + 1] = src[width] & 0xF;
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dst[width * 2 + 0] = src[width] >> 4;
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}
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}
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static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
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int c, line, pixels, code;
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const uint8_t *ssrc = src;
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@ -148,7 +158,11 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
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}
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src = zbuf;
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for(line = 0; line < lines; line++){
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if(s->bpp == 4){
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split_nibbles(dst, src, width);
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}else{
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memcpy(dst, src, width);
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}
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dst += stride;
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src += width;
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}
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@ -238,6 +252,8 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
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av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
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return -1;
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}
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if(s->bpp == 4)
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split_nibbles(dst, dst, width);
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break;
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}
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dst += stride;
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