Handling large jpegs in CPU raster - downsample to display res and 565

src/image/SkImage_Base.h

Index: src/image/SkImage_Base.h
diff --git a/src/image/SkImage_Base.h b/src/image/SkImage_Base.h
index 3fe3444aef976245979dd886349fe561dc2c077e..f8dd810a36e83c134d0a975d2e23f6565d7118e1 100644
--- a/src/image/SkImage_Base.h
+++ b/src/image/SkImage_Base.h
@@ -34,8 +34,9 @@ public:
     virtual GrTexture* peekTexture() const { return nullptr; }
 
     // return a read-only copy of the pixels. We promise to not modify them,
-    // but only inspect them (or encode them).
-    virtual bool getROPixels(SkBitmap*) const = 0;
+    // but only inspect them (or encode them). scaleHint (0 < defines lowest
+    // acceptable (meaning smaller won't be provided) scale for requested bitmap.
+    virtual bool getROPixels(SkBitmap*, SkScalar scaleHint = SK_Scalar1) const = 0;
 
     virtual SkImage* onApplyFilter(SkImageFilter*, SkIPoint* offset,
                                    bool forceResultToOriginalSize) const;