diff -r 08e1479a4c90 prism-sw-native/src/PiscesBlit.c
--- a/prism-sw-native/src/PiscesBlit.c	Tue Feb 26 14:24:40 2013 -0800
+++ b/prism-sw-native/src/PiscesBlit.c	Tue Feb 26 16:25:28 2013 -0800
@@ -203,7 +203,6 @@
     jint cgreen = rdr->_cgreen;
     jint cblue = rdr->_cblue;
     jint alpha = (calpha * frac) >> 16;
-
     jint lfrac = rdr->_el_lfrac;
     jint rfrac = rdr->_el_rfrac;
 
@@ -463,6 +462,8 @@
     jint lfrac = rdr->_el_lfrac;
     jint rfrac = rdr->_el_rfrac;
 
+    if (alpha == 0) return;
+
     minX = rdr->_minTouched;
     maxX = rdr->_maxTouched;
     w = rdr->_alphaWidth;
@@ -553,7 +554,7 @@
             palpha = (frac * ((cval >> 24) & 0xFF)) >> 16;
             if (palpha == MAX_ALPHA) {
                 *a = cval;
-            } else {
+            } else if (palpha != 0) {
                 blendSrcOver8888_pre(a, palpha, (cval >> 16) & 0xFF, (cval >> 8) & 0xFF, cval & 0xFF);
             }
             a += imagePixelStride;