[Mesa-dev] [PATCH] st/omx/enc: fix blit setup for YUV LoadImage

[Leo Liu]

The blit here involves scaling since it's copying from I8 format to R8G8 format.
Half of source will be filtered out with PIPE_TEX_FILTER_NEAREST instruction, it
looks that GPU always uses the second half as source. Currently we use "1" as
the start point of x for R, then causing 1 source pixel of U component shift to
right. So "-1" should be the start point for U component.

Cc: 18.0 18.1 <mesa-stable at lists.freedesktop.org>
---
 src/gallium/state_trackers/omx/vid_enc_common.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/gallium/state_trackers/omx/vid_enc_common.c b/src/gallium/state_trackers/omx/vid_enc_common.c
index 874dd3a..2aa739d 100644
--- a/src/gallium/state_trackers/omx/vid_enc_common.c
+++ b/src/gallium/state_trackers/omx/vid_enc_common.c
@@ -353,7 +353,7 @@ OMX_ERRORTYPE enc_LoadImage_common(vid_enc_PrivateType * priv, OMX_VIDEO_PORTDEF
       blit.src.resource = inp->resource;
       blit.src.format = inp->resource->format;
 
-      blit.src.box.x = 0;
+      blit.src.box.x = -1;
       blit.src.box.y = def->nFrameHeight;
       blit.src.box.width = def->nFrameWidth;
       blit.src.box.height = def->nFrameHeight / 2 ;
@@ -367,11 +367,11 @@ OMX_ERRORTYPE enc_LoadImage_common(vid_enc_PrivateType * priv, OMX_VIDEO_PORTDEF
       blit.dst.box.depth = 1;
       blit.filter = PIPE_TEX_FILTER_NEAREST;
 
-      blit.mask = PIPE_MASK_G;
+      blit.mask = PIPE_MASK_R;
       priv->s_pipe->blit(priv->s_pipe, &blit);
 
-      blit.src.box.x = 1;
-      blit.mask = PIPE_MASK_R;
+      blit.src.box.x = 0;
+      blit.mask = PIPE_MASK_G;
       priv->s_pipe->blit(priv->s_pipe, &blit);
       priv->s_pipe->flush(priv->s_pipe, NULL, 0);
 
-- 
2.7.4