Working plumb of image scaling:

src/core/SkBitmapProcState.h

Index: src/core/SkBitmapProcState.h
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index 5c6a4152fc285dd9c92fedc65f8e727f8bb920dc..2d63775b1c0fcf90b0f58f89e8bf2a8698f1ae33 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -33,11 +33,8 @@
 class SkPaint;
 
 struct SkBitmapProcState {
-
+    
     SkBitmapProcState(): fBitmapFilter(NULL) {}
-    ~SkBitmapProcState() {
-        SkDELETE(fBitmapFilter);
-    }
 
     typedef void (*ShaderProc32)(const SkBitmapProcState&, int x, int y,
                                  SkPMColor[], int count);
@@ -86,7 +83,18 @@ struct SkBitmapProcState {
     uint8_t             fInvType;           // chooseProcs
     uint8_t             fTileModeX;         // CONSTRUCTOR
     uint8_t             fTileModeY;         // CONSTRUCTOR
-    SkBool8             fDoFilter;          // chooseProcs
+    
+    enum { 
+        kNone_BitmapFilter, 
+        kBilerp_BitmapFilter, 
+        kHQ_BitmapFilter
+    } fFilterQuality;          // chooseProcs
+
+    /** The shader will let us know when we can release some of our resources
+      * like scaled bitmaps.
+      */
+
+    void endContext();
 
     /** Platforms implement this, and can optionally overwrite only the
         following fields:
@@ -142,16 +150,17 @@ private:
 
     SkMatrix            fUnitInvMatrix;     // chooseProcs
     SkBitmap            fOrigBitmap;        // CONSTRUCTOR
-    SkBitmap            fMipBitmap;
+    SkBitmap            fScaledBitmap;      // chooseProcs
 
     MatrixProc chooseMatrixProc(bool trivial_matrix);
     bool chooseProcs(const SkMatrix& inv, const SkPaint&);
     ShaderProc32 chooseShaderProc32();
+    
+    void possiblyScaleImage();
 
-    void buildFilterCoefficients(SkFixed dst[4], float t) const;
     SkBitmapFilter *fBitmapFilter;
 
-    ShaderProc32 chooseBitmapFilterProc(const SkPaint &paint);
+    ShaderProc32 chooseBitmapFilterProc();
 
     // Return false if we failed to setup for fast translate (e.g. overflow)
     bool setupForTranslate();