Subject: Add support for the A8 (PICT_TYPE_A) format mask for accelerated compositing
From: Arjan van de Ven <arjan@linux.intel.com>

Compositing currently gets to a software fallback if the mask is PICT_TYPE_A
(alpha mask only). Digging into this, the cause is that uxa_get_rgba_from_pixel
does not know how to deal with this format.... yet getting rgba from alpha-only
is not exactly rocket science.

This patch adds a case for PICT_TYPE_A to uxa_get_rgba_from_pixel() to deal with
this.

With this patch, X cpu usage is reduced by one second during the boot phase
of the Moblin OS.


diff --git a/uxa/uxa-render.c b/uxa/uxa-render.c
index 525f75b..ebdc270 100644
--- a/uxa/uxa-render.c
+++ b/uxa/uxa-render.c
@@ -179,7 +179,15 @@ uxa_get_rgba_from_pixel(CARD32 pixel,
 	int rbits, bbits, gbits, abits;
 	int rshift, bshift, gshift, ashift;
 
-	if (!PICT_FORMAT_COLOR(format))
+	if (PICT_FORMAT_TYPE(format) == PICT_TYPE_A) {
+	        *red = 0;
+                *green = 0;
+                *blue = 0;
+                *alpha = pixel << 8;
+                return TRUE;
+        }
+
+	if (!PICT_FORMAT_COLOR(format))
 		return FALSE;
 
 	rbits = PICT_FORMAT_R(format);