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targa: Do not read colormap from files without one. 

This is necessary because some programs writing TGA files forget
to initialize parts of the header they don't care about, resulting
in "random" data there.
The new behaviour is consistent with other programs, e.g. tgatoppm.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2011-06-27 19:15:46 +02:00
parent efdb198e00
commit 90cbbbc1e2
1 changed files with 7 additions and 2 deletions
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9
libavcodec/targa.c
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@ -109,17 +109,22 @@ static int decode_frame(AVCodecContext *avctx,
AVFrame * const p= (AVFrame*)&s->picture;
uint8_t *dst;
int stride;
int idlen, compr, y, w, h, bpp, flags;
int idlen, pal, compr, y, w, h, bpp, flags;
int first_clr, colors, csize;
/* parse image header */
CHECK_BUFFER_SIZE(buf, buf_end, 18, "header");
idlen = *buf++;
buf++; /* pal */
pal = *buf++;
compr = *buf++;
first_clr = bytestream_get_le16(&buf);
colors = bytestream_get_le16(&buf);
csize = *buf++;
if (!pal && (first_clr || colors || csize)) {
av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
// specification says we should ignore those value in this case
first_clr = colors = csize = 0;
}
buf += 2; /* x */
y = bytestream_get_le16(&buf);
w = bytestream_get_le16(&buf);