[FFmpeg-cvslog] Do not ignore full transparency when writing png palette.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Wed Dec  7 11:31:27 2011 +0100| [a99dbe014dbd01b227f97e7d7f0f72b3ae4f9be0] | committer: Carl Eugen Hoyos

Do not ignore full transparency when writing png palette.

This reverts r6689, "Make PNG produce correct 8-bit pictures".

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a99dbe014dbd01b227f97e7d7f0f72b3ae4f9be0
---

 libavcodec/pngenc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index 29f4e1a..b35402e 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -336,7 +336,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
         for(i = 0; i < 256; i++) {
             v = palette[i];
             alpha = v >> 24;
-            if (alpha && alpha != 0xff)
+            if (alpha != 0xff)
                 has_alpha = 1;
             *alpha_ptr++ = alpha;
             bytestream_put_be24(&ptr, v);