Add SkImage->draw() call with src and dst rects.

src/image/SkImagePriv.cpp

Index: src/image/SkImagePriv.cpp
diff --git a/src/image/SkImagePriv.cpp b/src/image/SkImagePriv.cpp
index c44e439b72c8b29eb82837b6dae19797d4b9569b..0ac33dda8f3045f0fe8a865695581a51c40fa59a 100644
--- a/src/image/SkImagePriv.cpp
+++ b/src/image/SkImagePriv.cpp
@@ -141,3 +141,34 @@ void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
     canvas->drawPicture(*picture);
     canvas->restoreToCount(saveCount);
 }
+
+void SkImagePrivDrawPicture(SkCanvas* canvas, SkPicture* picture,
+                            const SkRect* src,  const SkRect& dst, const SkPaint* paint) {  
+    int saveCount = canvas->getSaveCount();  
+
+    SkMatrix     matrix;
+    SkRect       pictureBounds, tmpSrc;
+
+    pictureBounds.set(0, 0,

[reed1, 2013/07/19 20:28:52]

minor, but might move the initialization of pictureBounds inside the else where
it is used, to avoid the cost of the int-to-float conversion when not needed.

+                      SkIntToScalar(picture->width()),
+                      SkIntToScalar(picture->height()));
+    if (NULL != src) {
+        tmpSrc = *src;
+    } else {
+        tmpSrc = pictureBounds;
+    }
+
+    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);
+    if (paint && needs_layer(*paint)) {
+        canvas->saveLayer(&dst, paint);
+    } else {
+        canvas->save();
+    }
+    canvas->concat(matrix);
+    if (!paint || !needs_layer(*paint)) {
+        canvas->clipRect(tmpSrc);
+    }
+    
+    canvas->drawPicture(*picture);
+    canvas->restoreToCount(saveCount);
+}