[FFmpeg-cvslog] Support transparency in 32bit bmp files.
Carl Eugen Hoyos
git at videolan.org
Fri Dec 2 00:27:19 CET 2011
ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Fri Dec 2 00:21:24 2011 +0100| [8b08f81949bcfa6fec42ff3f1c9bef5be8140300] | committer: Carl Eugen Hoyos
Support transparency in 32bit bmp files.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8b08f81949bcfa6fec42ff3f1c9bef5be8140300
---
libavcodec/bmp.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavcodec/bmp.c b/libavcodec/bmp.c
index 22973aa..3418edc 100644
--- a/libavcodec/bmp.c
+++ b/libavcodec/bmp.c
@@ -154,7 +154,7 @@ static int bmp_decode_frame(AVCodecContext *avctx,
rgb[2] = 0;
}
- avctx->pix_fmt = PIX_FMT_BGR24;
+ avctx->pix_fmt = PIX_FMT_BGRA;
break;
case 24:
avctx->pix_fmt = PIX_FMT_BGR24;
@@ -319,7 +319,13 @@ static int bmp_decode_frame(AVCodecContext *avctx,
dst[0] = src[rgb[2]];
dst[1] = src[rgb[1]];
dst[2] = src[rgb[0]];
- dst += 3;
+/* The Microsoft documentation states:
+ * "The high byte in each DWORD is not used."
+ * Both GIMP and ImageMagick store the alpha transparency value
+ * in the high byte for 32bit bmp files.
+ */
+ dst[3] = src[3];
+ dst += 4;
src += 4;
}
More information about the ffmpeg-cvslog
mailing list