Implement a generic matrix transform image filter.

gm/imagefiltersscaled.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 "SkColor.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
 #include "SkDisplacementMapEffect.h"
 #include "SkDropShadowImageFilter.h"
 #include "SkGradientShader.h"
 #include "SkLightingImageFilter.h"
 #include "SkMorphologyImageFilter.h"
 #include "SkOffsetImageFilter.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkRectShaderImageFilter.h"
-#include "SkResizeImageFilter.h"
+#include "SkTransformImageFilter.h"
 #include "SkScalar.h"
 
 #define RESIZE_FACTOR SkIntToScalar(4)
 
 namespace skiagm {
 
 class ImageFiltersScaledGM : public GM {
 public:
     ImageFiltersScaledGM() : fInitialized(false) {
         this->setBGColor(0x00000000);
@@ skipping 62 matching lines @@
             SkDoubleToScalar(0.1), SkDoubleToScalar(0.05), 1, 0));
 
         SkPoint3 pointLocation(0, 0, SkIntToScalar(10));
         SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20));
         SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0);
         SkScalar spotExponent = SK_Scalar1;
         SkScalar cutoffAngle = SkIntToScalar(15);
         SkScalar kd = SkIntToScalar(2);
         SkScalar surfaceScale = SkIntToScalar(1);
         SkColor white(0xFFFFFFFF);
+        SkMatrix resizeMatrix;
+        resizeMatrix.setScale(RESIZE_FACTOR, RESIZE_FACTOR);
 
         SkImageFilter* filters[] = {
             SkBlurImageFilter::Create(SkIntToScalar(4), SkIntToScalar(4)),
             SkDropShadowImageFilter::Create(SkIntToScalar(5), SkIntToScalar(10), SkIntToScalar(3),
                                             SK_ColorYELLOW),
             SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
                                             SkDisplacementMapEffect::kR_ChannelSelectorType,
                                             SkIntToScalar(12),
                                             gradient.get(),
                                             checkerboard.get()),
             SkDilateImageFilter::Create(1, 1, checkerboard.get()),
             SkErodeImageFilter::Create(1, 1, checkerboard.get()),
             SkOffsetImageFilter::Create(SkIntToScalar(32), 0),
-            SkResizeImageFilter::Create(RESIZE_FACTOR, RESIZE_FACTOR, SkPaint::kNone_FilterLevel),
+            SkTransformImageFilter::Create(resizeMatrix, SkPaint::kNone_FilterLevel),
             SkRectShaderImageFilter::Create(noise),
             SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd),
             SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent,
                                                         cutoffAngle, white, surfaceScale, kd),
         };
 
         SkVector scales[] = {
             SkVector::Make(SkScalarInvert(2), SkScalarInvert(2)),
             SkVector::Make(SkIntToScalar(1), SkIntToScalar(1)),
             SkVector::Make(SkIntToScalar(1), SkIntToScalar(2)),
@@ skipping 41 matching lines @@
     SkBitmap fGradientCircle;
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ImageFiltersScaledGM; }
 static GMRegistry reg(MyFactory);
 
 }