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

src/image/SkImage_Codec.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageDecoder.h"
 #include "SkImage_Base.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 
 class SkImage_Codec : public SkImage_Base {
 public:
     static SkImage* NewEmpty();
 
     SkImage_Codec(SkData* encodedData, int width, int height);
     virtual ~SkImage_Codec();
 
     virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+    virtual void onDraw(SkCanvas*, SkRect, SkRect, const SkPaint*) SK_OVERRIDE;
 
 private:
     SkData*     fEncodedData;
     SkBitmap    fBitmap;
 
     typedef SkImage_Base INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(width, height) {
     fEncodedData = data;
     fEncodedData->ref();
 }
 
 SkImage_Codec::~SkImage_Codec() {
     fEncodedData->unref();
 }
 
 void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
     if (!fBitmap.pixelRef()) {
         if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(),
                                           &fBitmap)) {
             return;
         }
     }
     canvas->drawBitmap(fBitmap, x, y, paint);
 }
 
+void SkImage_Codec::onDraw(SkCanvas* canvas, SkRect src, SkRect dst, const SkPaint* paint) {

[Justin Novosad, 2013/07/18 21:54:37]

Test or leave unimplemented

+    if (!fBitmap.pixelRef()) {
+        if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(),
+                                          &fBitmap)) {
+            return;
+        }
+    }
+    canvas->drawBitmapRectToRect(fBitmap, &src, dst, paint);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 SkImage* SkImage::NewEncodedData(SkData* data) {
     if (NULL == data) {
         return NULL;
     }
 
     SkBitmap bitmap;
     if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap,
                                       SkBitmap::kNo_Config,
                                       SkImageDecoder::kDecodeBounds_Mode)) {
         return NULL;
     }
 
     return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height()));
 }