Implement screen aligned bitmap drawing support.
diff --git a/rsMatrix.h b/rsMatrix.h
index 7dc4165..11ce42e 100644
--- a/rsMatrix.h
+++ b/rsMatrix.h
@@ -23,7 +23,7 @@
 namespace android {
 namespace renderscript {
 
-struct Matrix 
+struct Matrix
 {
     float m[16];
 
@@ -47,6 +47,8 @@
     void loadOrtho(float l, float r, float b, float t, float n, float f);
     void loadFrustum(float l, float r, float b, float t, float n, float f);
 
+    void vectorMultiply(float *v4out, const float *v3in) const;
+
     void multiply(const Matrix *rhs) {
         Matrix tmp;
         tmp.loadMultiply(this, rhs);
@@ -71,7 +73,7 @@
 
 
 };
-    
+
 
 
 }