More general version of image filtering; reworked to be robust and easier to SSE

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index 2a79f2f4902533126c0af5dc31d7504b5b653659..a2c7f990c2d9b19fe5ee238de9eae68757a62c3b 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -302,13 +302,13 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
         fShaderProc32 = this->chooseShaderProc32();
     }
 
-    // see if our platform has any accelerated overrides
-    this->platformProcs();
-
     if (NULL == fShaderProc32) {
-        fShaderProc32 = this->chooseBicubicFilterProc(paint);
+        fShaderProc32 = this->chooseBitmapFilterProc(paint);
     }
 
+    // see if our platform has any accelerated overrides
+    this->platformProcs();
+
     return true;
 }