Implement a generic matrix transform image filter.

gm/imageresizetiled.cpp

 /*
  * Copyright 2014 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 "SkResizeImageFilter.h"
+#include "SkMatrixImageFilter.h"
 #include "SkRandom.h"
 
 #define WIDTH 640
 #define HEIGHT 480
 
 #define RESIZE_FACTOR SkIntToScalar(2)
 
 namespace skiagm {
 
 class ImageResizeTiledGM : public GM {
 public:
     ImageResizeTiledGM() {
     }
 
 protected:
     virtual SkString onShortName() SK_OVERRIDE {
         return SkString("imageresizetiled");
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
         return make_isize(WIDTH, HEIGHT);
     }
 
     virtual uint32_t onGetFlags() const SK_OVERRIDE {
         return kSkipTiled_Flag;
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkPaint paint;
+        SkMatrix matrix;
+        matrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
         SkAutoTUnref<SkImageFilter> imageFilter(
-            SkResizeImageFilter::Create(RESIZE_FACTOR, RESIZE_FACTOR, SkPaint::kNone_FilterLevel));
+            SkMatrixImageFilter::Create(matrix, SkPaint::kNone_FilterLevel));
         paint.setImageFilter(imageFilter.get());
         const SkScalar tile_size = SkIntToScalar(100);
         SkRect bounds;
         canvas->getClipBounds(&bounds);
         for (SkScalar y = 0; y < HEIGHT; y += tile_size) {
             for (SkScalar x = 0; x < WIDTH; x += tile_size) {
                 canvas->save();
                 canvas->clipRect(SkRect::MakeXYWH(x, y, tile_size, tile_size));
                 canvas->scale(SkScalarInvert(RESIZE_FACTOR),
                               SkScalarInvert(RESIZE_FACTOR));
@@ skipping 21 matching lines @@
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageResizeTiledGM(); )
 
 }