st/xorg: Use I8 format instead of A8 for depth 8 pixmaps.

Seems to work better for Composite acceleration.

diff --git a/src/gallium/state_trackers/xorg/xorg_exa.c b/src/gallium/state_trackers/xorg/xorg_exa.c
index 1bb274e6bdd56f493da9f47a4253e08262614056..94f4ea2c3868a5e90f9b30076c2d05dc9b02dcd9 100644 (file)
--- a/src/gallium/state_trackers/xorg/xorg_exa.c
+++ b/src/gallium/state_trackers/xorg/xorg_exa.c
@@ -75,7 +75,7 @@ exa_get_pipe_format(int depth, enum pipe_format *format, int *bbp)
        assert(*bbp == 16);
        break;
     case 8:
-       *format = PIPE_FORMAT_A8_UNORM;
+       *format = PIPE_FORMAT_I8_UNORM;
        assert(*bbp == 8);
        break;
     case 4: