Bilerp + mirror + perspective

src/core/SkBitmapProcState.h

Index: src/core/SkBitmapProcState.h
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index 26e8db88589297510550e03031b8bab85a7ca0bf..40dc31a5e0c4528fa75974fe2a9d7f3ff9ca0a5c 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -35,7 +35,9 @@ struct SkBitmapProcInfo {
     const SkBitmapProvider fProvider;
 
     SkPixmap            fPixmap;
-    SkMatrix            fInvMatrix;         // copy of what is in fBMState, can we remove the dup?
+    SkMatrix            fInvMatrix;         // This changes based on tile mode.
+    // TODO: combine fInvMatrix and fRealInvMatrix.
+    SkMatrix            fRealInvMatrix;     // The actual inverse matrix.
     SkColor             fPaintColor;
     SkShader::TileMode  fTileModeX;
     SkShader::TileMode  fTileModeY;