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bmpdec: proper check for alpha

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Paul B Mahol 2012-01-12 01:47:59 +00:00 committed by Michael Niedermayer
parent f068ce570f
commit bd36ec55be
1 changed files with 7 additions and 4 deletions
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11
libavcodec/bmp.c
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@ -49,6 +49,7 @@ static int bmp_decode_frame(AVCodecContext *avctx,
unsigned int ihsize;
int i, j, n, linesize;
uint32_t rgb[3];
uint32_t alpha = 0;
uint8_t *ptr;
int dsize;
const uint8_t *buf0 = buf;
@ -131,6 +132,8 @@ static int bmp_decode_frame(AVCodecContext *avctx,
rgb[0] = bytestream_get_le32(&buf);
rgb[1] = bytestream_get_le32(&buf);
rgb[2] = bytestream_get_le32(&buf);
if (ihsize >= 108)
alpha = bytestream_get_le32(&buf);
}
avctx->width = width;
@ -142,13 +145,13 @@ static int bmp_decode_frame(AVCodecContext *avctx,
case 32:
if(comp == BMP_BITFIELDS){
if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
avctx->pix_fmt = PIX_FMT_ABGR;
avctx->pix_fmt = alpha ? PIX_FMT_ABGR : PIX_FMT_0BGR;
else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
avctx->pix_fmt = PIX_FMT_BGRA;
avctx->pix_fmt = alpha ? PIX_FMT_BGRA : PIX_FMT_BGR0;
else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
avctx->pix_fmt = PIX_FMT_ARGB;
avctx->pix_fmt = alpha ? PIX_FMT_ARGB : PIX_FMT_0RGB;
else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
avctx->pix_fmt = PIX_FMT_RGBA;
avctx->pix_fmt = alpha ? PIX_FMT_RGBA : PIX_FMT_RGB0;
else {
av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
return AVERROR(EINVAL);