make drawImage a virtual on SkDevice

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 3e3f714880276191cdb9a29e38c9bb7f2eba86c7..34d6aaa0ab4ddbb9ae5f158a846d77636c326642 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1734,12 +1734,15 @@ void SkCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
     this->onDrawPath(path, paint);
 }
 
-void SkCanvas::drawImage(const SkImage* image, SkScalar dx, SkScalar dy, const SkPaint* paint) {
-    this->onDrawImage(image, dx, dy, paint);
+void SkCanvas::drawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint* paint) {
+    this->onDrawImage(image, x, y, paint);
 }
 
 void SkCanvas::drawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
                              const SkPaint* paint) {
+    if (dst.isEmpty()) {
+        return;
+    }
     this->onDrawImageRect(image, src, dst, paint);
 }
 
@@ -1959,15 +1962,58 @@ void SkCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
     LOOPER_END
 }
 
-void SkCanvas::onDrawImage(const SkImage* image, SkScalar dx, SkScalar dy, const SkPaint* paint) {
+void SkCanvas::onDrawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint* paint) {
     TRACE_EVENT0("disabled-by-default-skia", "SkCanvas::drawImage()");
-    image->draw(this, dx, dy, paint);
+    SkRect bounds = SkRect::MakeXYWH(x, y,
+                                     SkIntToScalar(image->width()), SkIntToScalar(image->height()));
+    if (NULL == paint || paint->canComputeFastBounds()) {
+        if (paint) {
+            paint->computeFastBounds(bounds, &bounds);
+        }
+        if (this->quickReject(bounds)) {
+            return;
+        }
+    }
+    
+    SkLazyPaint lazy;
+    if (NULL == paint) {
+        paint = lazy.init();
+    }
+    
+    LOOPER_BEGIN(*paint, SkDrawFilter::kBitmap_Type, &bounds)
+    
+    while (iter.next()) {
+        iter.fDevice->drawImage(iter, image, x, y, looper.paint());
+    }
+    
+    LOOPER_END
 }
 
 void SkCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
                                const SkPaint* paint) {
     TRACE_EVENT0("disabled-by-default-skia", "SkCanvas::drawImageRect()");
-    image->drawRect(this, src, dst, paint);
+    SkRect storage;
+    const SkRect* bounds = &dst;
+    if (NULL == paint || paint->canComputeFastBounds()) {
+        if (paint) {
+            bounds = &paint->computeFastBounds(dst, &storage);
+        }
+        if (this->quickReject(*bounds)) {
+            return;
+        }
+    }
+    SkLazyPaint lazy;
+    if (NULL == paint) {
+        paint = lazy.init();
+    }
+    
+    LOOPER_BEGIN(*paint, SkDrawFilter::kBitmap_Type, bounds)
+    
+    while (iter.next()) {
+        iter.fDevice->drawImageRect(iter, image, src, dst, looper.paint());
+    }
+    
+    LOOPER_END
 }
 
 void SkCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar x, SkScalar y, const SkPaint* paint) {