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[media] vivid-tpg: improve Y16 color setup 

Currently the colors for the Y16 and Y16_BE pixelformats are in the range
0x0000-0xff00. So pure white (0xffff) is never created.

Improve this by making white really white. For other colors the lsb remains 0
so vivid can be used to detect endian problems.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Ricardo Ribalda <ricardo.ribalda@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-06-05 03:45:38 -03:00 committed by Mauro Carvalho Chehab
parent 4d38cde776
commit afeef4ee23
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/media/platform/vivid/vivid-tpg.c
View File

@ -900,12 +900,19 @@ static void gen_twopix(struct tpg_data *tpg,
buf[0][offset] = r_y;
break;
case V4L2_PIX_FMT_Y16:
buf[0][offset] = 0;
/*
* Ideally both bytes should be set to r_y, but then you won't
* be able to detect endian problems. So keep it 0 except for
* the corner case where r_y is 0xff so white really will be
* white (0xffff).
*/
buf[0][offset] = r_y == 0xff ? r_y : 0;
buf[0][offset+1] = r_y;
break;
case V4L2_PIX_FMT_Y16_BE:
/* See comment for V4L2_PIX_FMT_Y16 above */
buf[0][offset] = r_y;
buf[0][offset+1] = 0;
buf[0][offset+1] = r_y == 0xff ? r_y : 0;
break;
case V4L2_PIX_FMT_YUV422P:
case V4L2_PIX_FMT_YUV420: