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[media] vivid-tpg: correctly average the two pixels in gen_twopix()

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gen_twopix() is always called twice: once for the first and once for
the second pixel. Improve the code to properly average the two if the
format requires horizontal downsampling.

This is necessary for patterns like 1x1 red/blue checkers.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-03-07 14:15:25 -03:00 committed by Mauro Carvalho Chehab
parent 5d7c539e19
commit 1f088dc162
1 changed files with 42 additions and 6 deletions
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48
drivers/media/platform/vivid/vivid-tpg.c
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@ -687,28 +687,64 @@ static void gen_twopix(struct tpg_data *tpg,
switch (tpg->fourcc) {
case V4L2_PIX_FMT_NV16M:
buf[0][offset] = r_y;
buf[1][offset] = odd ? b_v : g_u;
if (odd) {
buf[1][0] = (buf[1][0] + g_u) / 2;
buf[1][1] = (buf[1][1] + b_v) / 2;
break;
}
buf[1][0] = g_u;
buf[1][1] = b_v;
break;
case V4L2_PIX_FMT_NV61M:
buf[0][offset] = r_y;
buf[1][offset] = odd ? g_u : b_v;
if (odd) {
buf[1][0] = (buf[1][0] + b_v) / 2;
buf[1][1] = (buf[1][1] + g_u) / 2;
break;
}
buf[1][0] = b_v;
buf[1][1] = g_u;
break;
case V4L2_PIX_FMT_YUYV:
buf[0][offset] = r_y;
buf[0][offset + 1] = odd ? b_v : g_u;
if (odd) {
buf[0][1] = (buf[0][1] + g_u) / 2;
buf[0][3] = (buf[0][3] + b_v) / 2;
break;
}
buf[0][1] = g_u;
buf[0][3] = b_v;
break;
case V4L2_PIX_FMT_UYVY:
buf[0][offset] = odd ? b_v : g_u;
buf[0][offset + 1] = r_y;
if (odd) {
buf[0][0] = (buf[0][0] + g_u) / 2;
buf[0][2] = (buf[0][2] + b_v) / 2;
break;
}
buf[0][0] = g_u;
buf[0][2] = b_v;
break;
case V4L2_PIX_FMT_YVYU:
buf[0][offset] = r_y;
buf[0][offset + 1] = odd ? g_u : b_v;
if (odd) {
buf[0][1] = (buf[0][1] + b_v) / 2;
buf[0][3] = (buf[0][3] + g_u) / 2;
break;
}
buf[0][1] = b_v;
buf[0][3] = g_u;
break;
case V4L2_PIX_FMT_VYUY:
buf[0][offset] = odd ? g_u : b_v;
buf[0][offset + 1] = r_y;
if (odd) {
buf[0][0] = (buf[0][0] + b_v) / 2;
buf[0][2] = (buf[0][2] + g_u) / 2;
break;
}
buf[0][0] = b_v;
buf[0][2] = g_u;
break;
case V4L2_PIX_FMT_RGB565:
buf[0][offset] = (g_u << 5) | b_v;