--- pixman/pixman/pixman-compose.c.old	2007-11-28 16:21:58.809105000 +0800
+++ pixman/pixman/pixman-compose.c	2007-11-28 16:23:52.669312000 +0800
@@ -1803,11 +1803,17 @@
     int i;
     for (i = 0; i < width; ++i) {
         uint32_t s = *(src + i);
-        uint32_t d = *(dest + i);
         uint32_t ia = Alpha(~s);
 
-        FbByteMulAdd(d, ia, s);
-	*(dest + i) = d;
+        if (ia == 0) {
+            *(dest + i) = s;
+        }
+        else {
+            uint32_t d = *(dest + i);
+            FbByteMulAdd(d, ia, s);
+            *(dest + i) = d;
+        }
+
     }
 }
 
@@ -1831,8 +1837,16 @@
     for (i = 0; i < width; ++i) {
         uint32_t s = *(src + i);
         uint32_t a = Alpha(*(dest + i));
-        FbByteMul(s, a);
-	*(dest + i) = s;
+
+        if (a == 0xff)
+        {
+            *(dest + i) = s;
+        }
+        else
+        {
+            FbByteMul(s, a);
+            *(dest + i) = s;
+        }
     }
 }