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fix interlaced decoding, original patch from reimar
Originally committed as revision 12349 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -126,11 +126,8 @@ static int gif_read_image(GifState *s)
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y1 += 8;
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ptr += linesize * 8;
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if (y1 >= height) {
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y1 = 4;
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if (pass == 0)
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ptr = ptr1 + linesize * 4;
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else
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ptr = ptr1 + linesize * 2;
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y1 = pass ? 2 : 4;
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ptr = ptr1 + linesize * y1;
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pass++;
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}
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break;
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