uxa: After filling the alpha channel xrgb src is compatible with argb dst.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

uxa/uxa-render.c

@@ -963,6 +963,10 @@ compatible_formats (CARD8 op, PicturePtr dst, PicturePtr src)
 
 		if (src->format == PICT_a8b8g8r8 && dst->format == PICT_x8b8g8r8)
 			return 1;
+
+		/* xrgb is promoted to argb during image upload... */
+		if (dst->format == PICT_a8r8g8b8 && src->format == PICT_x8r8g8b8)
+			return 1;
 	} else if (op == PictOpOver) {
 		if (src->alphaMap || dst->alphaMap)
 			return 0;