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Implement gif transparency 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21913 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2007-01-13 12:56:02 +00:00
parent 79cc33a851
commit ba63e7b28d
1 changed files with 18 additions and 0 deletions
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18
libmpdemux/demux_gif.c
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@ -53,6 +53,8 @@ static int demux_gif_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
ColorMapObject *effective_map = NULL;
char *buf = NULL;
int refmode = 0;
int transparency = 0;
uint8_t transparent_col;
while (type != IMAGE_DESC_RECORD_TYPE) {
if (DGifGetRecordType(gif, &type) == GIF_ERROR) {
@ -78,8 +80,10 @@ static int demux_gif_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
int frametime = 0;
if (p[0] == 4) // is the length correct?
{
transparency = p[1] & 1;
frametime = (p[3] << 8) | p[2]; // set the time, centiseconds
refmode = (p[1] >> 2) & 3;
transparent_col = p[4];
}
priv->current_pts += frametime;
} else if ((code == 0xFE) && (verbose)) { // comment extension
@ -144,6 +148,20 @@ static int demux_gif_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
priv->palette[(y * 4) + 3] = 0;
}
if (transparency) {
uint8_t *dpos = dest, *spos = buf;
int hleft = h;
while (hleft-- > 0) {
int wleft = w;
while (wleft-- > 0) {
if (*spos != transparent_col)
*dpos = *spos;
dpos++; spos++;
}
dpos += priv->w - w;
spos += gif->Image.Width - w;
}
} else
memcpy_pic(dest, buf, w, h, priv->w, gif->Image.Width);
if (refmode == 1) memcpy(priv->refimg, dp->buffer, priv->w * priv->h);