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Do not ignore full transparency when writing png palette.
This reverts r6689, "Make PNG produce correct 8-bit pictures".
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@ -336,7 +336,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
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for(i = 0; i < 256; i++) {
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v = palette[i];
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alpha = v >> 24;
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if (alpha && alpha != 0xff)
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if (alpha != 0xff)
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has_alpha = 1;
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*alpha_ptr++ = alpha;
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bytestream_put_be24(&ptr, v);
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