When reducing a xy reflection to a 180 degree rotation, make sure
only one rotation bit is set. Also by rotating the bit left, we
can support cases where xy reflection happens with 90/270 degree
rotation.
Signed-off-by: Bob Paauwe <bob.j.paauwe@xxxxxxxxx>
---
src/sna/sna_display.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 5b975c1..c8c2197 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -1007,6 +1007,8 @@ static unsigned
rotation_reduce(struct plane *p, unsigned rotation)
{
unsigned unsupported_rotations = rotation & ~p->rotation.supported;
+ unsigned rr_mask = (RR_Rotate_0 | RR_Rotate_90 |
+ RR_Rotate_180 | RR_Rotate_270);
if (unsupported_rotations == 0)
return rotation;
@@ -1016,7 +1018,8 @@ rotation_reduce(struct plane *p, unsigned rotation)
if ((unsupported_rotations & RR_Reflect_XY) == RR_Reflect_XY &&
p->rotation.supported& RR_Rotate_180) {
rotation &= ~RR_Reflect_XY;
- rotation ^= RR_Rotate_180;
+ rotation = ((rotation << 2 & rr_mask) |
+ (((rotation << 2) & ~rr_mask) >> 4));
}
if ((unsupported_rotations & RR_Rotate_180) &&
--
2.1.0
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