Implement a generic matrix transform image filter.

gm/resizeimagefilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkBitmapDevice.h"
 #include "SkBitmapSource.h"
 #include "SkColor.h"
-#include "SkResizeImageFilter.h"
+#include "SkMatrixImageFilter.h"
 #include "SkRefCnt.h"
 
 namespace skiagm {
 
 class ResizeGM : public GM {
 public:
     ResizeGM() {
         this->setBGColor(0x00000000);
     }
 
 protected:
     virtual SkString onShortName() {
         return SkString("resizeimagefilter");
     }
 
     void draw(SkCanvas* canvas,
               const SkRect& rect,
               const SkSize& deviceSize,
               SkPaint::FilterLevel filterLevel,
               SkImageFilter* input = NULL) {
         SkRect dstRect;
         canvas->getTotalMatrix().mapRect(&dstRect, rect);
         canvas->save();
         SkScalar deviceScaleX = SkScalarDiv(deviceSize.width(), dstRect.width());
         SkScalar deviceScaleY = SkScalarDiv(deviceSize.height(), dstRect.height());
         canvas->translate(rect.x(), rect.y());
         canvas->scale(deviceScaleX, deviceScaleY);
         canvas->translate(-rect.x(), -rect.y());
+        SkMatrix matrix;
+        matrix.setScale(SkScalarInvert(deviceScaleX),
+                        SkScalarInvert(deviceScaleY));
         SkAutoTUnref<SkImageFilter> imageFilter(
-            SkResizeImageFilter::Create(SkScalarInvert(deviceScaleX),
-                                        SkScalarInvert(deviceScaleY),
-                                        filterLevel,
-                                        input));
+            SkMatrixImageFilter::Create(matrix, filterLevel, input));
         SkPaint filteredPaint;
         filteredPaint.setImageFilter(imageFilter.get());
         canvas->saveLayer(&rect, &filteredPaint);
         SkPaint paint;
         paint.setColor(0xFF00FF00);
         SkRect ovalRect = rect;
         ovalRect.inset(SkIntToScalar(4), SkIntToScalar(4));
         canvas->drawOval(ovalRect, paint);
         canvas->restore(); // for saveLayer
         canvas->restore();
@@ skipping 58 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ResizeGM; }
 static GMRegistry reg(MyFactory);
 
 }