text: /*
   * 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 "SkArithmeticImageFilter.h"
  #include "SkBitmap.h"
  #include "SkBlurImageFilter.h"
  #include "SkCanvas.h"
  #include "SkColorFilterImageFilter.h"
  #include "SkColorMatrixFilter.h"
  #include "SkColorSpaceXformer.h"
  #include "SkComposeImageFilter.h"
  #include "SkDisplacementMapEffect.h"
  #include "SkDropShadowImageFilter.h"
  #include "SkGradientShader.h"
  #include "SkImage.h"
  #include "SkImageFilterPriv.h"
  #include "SkImageSource.h"
  #include "SkLightingImageFilter.h"
  #include "SkMatrixConvolutionImageFilter.h"
  #include "SkMergeImageFilter.h"
  #include "SkMorphologyImageFilter.h"
  #include "SkOffsetImageFilter.h"
  #include "SkPaintImageFilter.h"
  #include "SkPerlinNoiseShader.h"
  #include "SkPicture.h"
  #include "SkPictureImageFilter.h"
  #include "SkPictureRecorder.h"
  #include "SkPoint3.h"
  #include "SkReadBuffer.h"
  #include "SkRect.h"
  #include "SkSpecialImage.h"
  #include "SkSpecialSurface.h"
  #include "SkSurface.h"
  #include "SkTableColorFilter.h"
  #include "SkTileImageFilter.h"
  #include "SkXfermodeImageFilter.h"
  #include "Resources.h"
  #include "Test.h"
  #include "sk_tool_utils.h"
  
  #include "GrCaps.h"
  #include "GrContext.h"
  #include "GrContextPriv.h"
  
  static const int kBitmapSize = 4;
  
  namespace {
  
  class MatrixTestImageFilter : public SkImageFilter {
  public:
      static sk_sp<SkImageFilter> Make(skiatest::Reporter* reporter,
                                       const SkMatrix& expectedMatrix) {
          return sk_sp<SkImageFilter>(new MatrixTestImageFilter(reporter, expectedMatrix));
      }
  
      SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(MatrixTestImageFilter)
  
  protected:
      sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context& ctx,
                                          SkIPoint* offset) const override {
          REPORTER_ASSERT(fReporter, ctx.ctm() == fExpectedMatrix);
          offset->fX = offset->fY = 0;
          return sk_ref_sp<SkSpecialImage>(source);
      }
      sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override {
          return sk_ref_sp(const_cast<MatrixTestImageFilter*>(this));
      }
  
      void flatten(SkWriteBuffer& buffer) const override {
          SkDEBUGFAIL("Should never get here");
      }
  
  private:
      MatrixTestImageFilter(skiatest::Reporter* reporter, const SkMatrix& expectedMatrix)
          : INHERITED(nullptr, 0, nullptr)
          , fReporter(reporter)
          , fExpectedMatrix(expectedMatrix) {
      }
  
      skiatest::Reporter* fReporter;
      SkMatrix fExpectedMatrix;
  
      typedef SkImageFilter INHERITED;
  };
  
  class FailImageFilter : public SkImageFilter {
  public:
      FailImageFilter() : SkImageFilter(nullptr, 0, nullptr) { }
  
      sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source,
                                          const Context& ctx,
                                          SkIPoint* offset) const override {
          return nullptr;
      }
      sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override {
          return nullptr;
      }
  
      SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(FailImageFilter)
  
  private:
      typedef SkImageFilter INHERITED;
  };
  
  sk_sp<SkFlattenable> FailImageFilter::CreateProc(SkReadBuffer& buffer) {
      SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
      return sk_sp<SkFlattenable>(new FailImageFilter());
  }
  
  void draw_gradient_circle(SkCanvas* canvas, int width, int height) {
      SkScalar x = SkIntToScalar(width / 2);
      SkScalar y = SkIntToScalar(height / 2);
      SkScalar radius = SkMinScalar(x, y) * 0.8f;
      canvas->clear(0x00000000);
      SkColor colors[2];
      colors[0] = SK_ColorWHITE;
      colors[1] = SK_ColorBLACK;
      sk_sp<SkShader> shader(
          SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr, 2,
                                         SkShader::kClamp_TileMode)
      );
      SkPaint paint;
      paint.setShader(shader);
      canvas->drawCircle(x, y, radius, paint);
  }
  
  SkBitmap make_gradient_circle(int width, int height) {
      SkBitmap bitmap;
      bitmap.allocN32Pixels(width, height);
      SkCanvas canvas(bitmap);
      draw_gradient_circle(&canvas, width, height);
      return bitmap;
  }
  
  class FilterList {
  public:
      FilterList(sk_sp<SkImageFilter> input, const SkImageFilter::CropRect* cropRect = nullptr) {
          SkPoint3 location = SkPoint3::Make(0, 0, SK_Scalar1);
          const SkScalar five = SkIntToScalar(5);
          {
              sk_sp<SkColorFilter> cf(SkColorFilter::MakeModeFilter(SK_ColorRED,
                                                                    SkBlendMode::kSrcIn));
  
              this->addFilter("color filter",
                  SkColorFilterImageFilter::Make(std::move(cf), input, cropRect));
          }
          {
              sk_sp<SkImage> gradientImage(SkImage::MakeFromBitmap(make_gradient_circle(64, 64)));
              sk_sp<SkImageFilter> gradientSource(SkImageSource::Make(std::move(gradientImage)));
  
              this->addFilter("displacement map",
                  SkDisplacementMapEffect::Make(SkDisplacementMapEffect::kR_ChannelSelectorType,
                                                SkDisplacementMapEffect::kB_ChannelSelectorType,
                                                20.0f,
                                                std::move(gradientSource), input, cropRect));
          }
          this->addFilter("blur", SkBlurImageFilter::Make(SK_Scalar1,
                                                          SK_Scalar1,
                                                          input,
                                                          cropRect));
          this->addFilter("drop shadow", SkDropShadowImageFilter::Make(
                    SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_ColorGREEN,
                    SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
                    input, cropRect));
          this->addFilter("diffuse lighting",
                    SkLightingImageFilter::MakePointLitDiffuse(location, SK_ColorGREEN, 0, 0,
                                                               input, cropRect));
          this->addFilter("specular lighting",
                    SkLightingImageFilter::MakePointLitSpecular(location, SK_ColorGREEN, 0, 0, 0,
                                                                input, cropRect));
          {
              SkScalar kernel[9] = {
                  SkIntToScalar(1), SkIntToScalar(1), SkIntToScalar(1),
                  SkIntToScalar(1), SkIntToScalar(-7), SkIntToScalar(1),
                  SkIntToScalar(1), SkIntToScalar(1), SkIntToScalar(1),
              };
              const SkISize kernelSize = SkISize::Make(3, 3);
              const SkScalar gain = SK_Scalar1, bias = 0;
  
              // This filter needs a saveLayer bc it is in repeat mode
              this->addFilter("matrix convolution",
                              SkMatrixConvolutionImageFilter::Make(
                                            kernelSize, kernel, gain, bias, SkIPoint::Make(1, 1),
                                            SkMatrixConvolutionImageFilter::kRepeat_TileMode, false,
                                            input, cropRect),
                              true);
          }
          this->addFilter("merge", SkMergeImageFilter::Make(input, input, cropRect));
  
          {
              SkPaint greenColorShaderPaint;
              greenColorShaderPaint.setShader(SkShader::MakeColorShader(SK_ColorGREEN));
  
              SkImageFilter::CropRect leftSideCropRect(SkRect::MakeXYWH(0, 0, 32, 64));
              sk_sp<SkImageFilter> paintFilterLeft(SkPaintImageFilter::Make(greenColorShaderPaint,
                                                                            &leftSideCropRect));
              SkImageFilter::CropRect rightSideCropRect(SkRect::MakeXYWH(32, 0, 32, 64));
              sk_sp<SkImageFilter> paintFilterRight(SkPaintImageFilter::Make(greenColorShaderPaint,
                                                                             &rightSideCropRect));
  
  
              this->addFilter("merge with disjoint inputs", SkMergeImageFilter::Make(
                    std::move(paintFilterLeft), std::move(paintFilterRight), cropRect));
          }
  
          this->addFilter("offset",
                          SkOffsetImageFilter::Make(SK_Scalar1, SK_Scalar1, input,
                                                    cropRect));
          this->addFilter("dilate", SkDilateImageFilter::Make(3, 2, input, cropRect));
          this->addFilter("erode", SkErodeImageFilter::Make(2, 3, input, cropRect));
          this->addFilter("tile", SkTileImageFilter::Make(
                                      SkRect::MakeXYWH(0, 0, 50, 50),
                                      cropRect ? cropRect->rect() : SkRect::MakeXYWH(0, 0, 100, 100),
                                      input));
  
          if (!cropRect) {
              SkMatrix matrix;
  
              matrix.setTranslate(SK_Scalar1, SK_Scalar1);
              matrix.postRotate(SkIntToScalar(45), SK_Scalar1, SK_Scalar1);
  
              this->addFilter("matrix",
                  SkImageFilter::MakeMatrixFilter(matrix, kLow_SkFilterQuality, input));
          }
          {
              sk_sp<SkImageFilter> blur(SkBlurImageFilter::Make(five, five, input));
  
              this->addFilter("blur and offset", SkOffsetImageFilter::Make(five, five,
                                                                           std::move(blur),
                                                                           cropRect));
          }
          {
              SkPictureRecorder recorder;
              SkCanvas* recordingCanvas = recorder.beginRecording(64, 64);
  
              SkPaint greenPaint;
              greenPaint.setColor(SK_ColorGREEN);
              recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeXYWH(10, 10, 30, 20)), greenPaint);
              sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
              sk_sp<SkImageFilter> pictureFilter(SkPictureImageFilter::Make(std::move(picture)));
  
              this->addFilter("picture and blur", SkBlurImageFilter::Make(five, five,
                                                                          std::move(pictureFilter),
                                                                          cropRect));
          }
          {
              SkPaint paint;
              paint.setShader(SkPerlinNoiseShader::MakeTurbulence(SK_Scalar1, SK_Scalar1, 1, 0));
              sk_sp<SkImageFilter> paintFilter(SkPaintImageFilter::Make(paint));
  
              this->addFilter("paint and blur", SkBlurImageFilter::Make(five, five,
                                                                        std::move(paintFilter),
                                                                        cropRect));
          }
          this->addFilter("xfermode", SkXfermodeImageFilter::Make(SkBlendMode::kSrc, input, input,
                                                                  cropRect));
      }
      int count() const { return fFilters.count(); }
      SkImageFilter* getFilter(int index) const { return fFilters[index].fFilter.get(); }
      const char* getName(int index) const { return fFilters[index].fName; }
      bool needsSaveLayer(int index) const { return fFilters[index].fNeedsSaveLayer; }
  private:
      struct Filter {
          Filter() : fName(nullptr), fNeedsSaveLayer(false) {}
          Filter(const char* name, sk_sp<SkImageFilter> filter, bool needsSaveLayer)
              : fName(name)
              , fFilter(std::move(filter))
              , fNeedsSaveLayer(needsSaveLayer) {
          }
          const char*                 fName;
          sk_sp<SkImageFilter>        fFilter;
          bool                        fNeedsSaveLayer;
      };
      void addFilter(const char* name, sk_sp<SkImageFilter> filter, bool needsSaveLayer = false) {
          fFilters.push_back(Filter(name, std::move(filter), needsSaveLayer));
      }
  
      SkTArray<Filter> fFilters;
  };
  
  class FixedBoundsImageFilter : public SkImageFilter {
  public:
      FixedBoundsImageFilter(const SkIRect& bounds)
              : SkImageFilter(nullptr, 0, nullptr), fBounds(bounds) {}
  
  private:
      Factory getFactory() const override { return nullptr; }
  
      sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* src, const Context&,
                                          SkIPoint* offset) const override {
          return nullptr;
      }
      sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override { return nullptr; }
  
      SkIRect onFilterBounds(const SkIRect&, const SkMatrix&,
                             MapDirection, const SkIRect*) const override {
          return fBounds;
      }
  
      SkIRect fBounds;
  };
  }
  
  sk_sp<SkFlattenable> MatrixTestImageFilter::CreateProc(SkReadBuffer& buffer) {
      SkDEBUGFAIL("Should never get here");
      return nullptr;
  }
  
  static sk_sp<SkImage> make_small_image() {
      auto surface(SkSurface::MakeRasterN32Premul(kBitmapSize, kBitmapSize));
      SkCanvas* canvas = surface->getCanvas();
      canvas->clear(0x00000000);
      SkPaint darkPaint;
      darkPaint.setColor(0xFF804020);
      SkPaint lightPaint;
      lightPaint.setColor(0xFF244484);
      const int i = kBitmapSize / 4;
      for (int y = 0; y < kBitmapSize; y += i) {
          for (int x = 0; x < kBitmapSize; x += i) {
              canvas->save();
              canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
              canvas->drawRect(SkRect::MakeXYWH(0, 0,
                                               SkIntToScalar(i),
                                               SkIntToScalar(i)), darkPaint);
              canvas->drawRect(SkRect::MakeXYWH(SkIntToScalar(i),
                                               0,
                                               SkIntToScalar(i),
                                               SkIntToScalar(i)), lightPaint);
              canvas->drawRect(SkRect::MakeXYWH(0,
                                               SkIntToScalar(i),
                                               SkIntToScalar(i),
                                               SkIntToScalar(i)), lightPaint);
              canvas->drawRect(SkRect::MakeXYWH(SkIntToScalar(i),
                                               SkIntToScalar(i),
                                               SkIntToScalar(i),
                                               SkIntToScalar(i)), darkPaint);
              canvas->restore();
          }
      }
  
      return surface->makeImageSnapshot();
  }
  
  static sk_sp<SkImageFilter> make_scale(float amount, sk_sp<SkImageFilter> input) {
      SkScalar s = amount;
      SkScalar matrix[20] = { s, 0, 0, 0, 0,
                              0, s, 0, 0, 0,
                              0, 0, s, 0, 0,
                              0, 0, 0, s, 0 };
      sk_sp<SkColorFilter> filter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
      return SkColorFilterImageFilter::Make(std::move(filter), std::move(input));
  }
  
  static sk_sp<SkImageFilter> make_grayscale(sk_sp<SkImageFilter> input,
                                             const SkImageFilter::CropRect* cropRect) {
      SkScalar matrix[20];
      memset(matrix, 0, 20 * sizeof(SkScalar));
      matrix[0] = matrix[5] = matrix[10] = 0.2126f;
      matrix[1] = matrix[6] = matrix[11] = 0.7152f;
      matrix[2] = matrix[7] = matrix[12] = 0.0722f;
      matrix[18] = 1.0f;
      sk_sp<SkColorFilter> filter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
      return SkColorFilterImageFilter::Make(std::move(filter), std::move(input), cropRect);
  }
  
  static sk_sp<SkImageFilter> make_blue(sk_sp<SkImageFilter> input,
                                        const SkImageFilter::CropRect* cropRect) {
      sk_sp<SkColorFilter> filter(SkColorFilter::MakeModeFilter(SK_ColorBLUE,
                                                                SkBlendMode::kSrcIn));
      return SkColorFilterImageFilter::Make(std::move(filter), std::move(input), cropRect);
  }
  
  static sk_sp<SkSpecialSurface> create_empty_special_surface(GrContext* context, int widthHeight) {
      if (context) {
          return SkSpecialSurface::MakeRenderTarget(context,
                                                    widthHeight, widthHeight,
                                                    kRGBA_8888_GrPixelConfig, nullptr);
      } else {
          const SkImageInfo info = SkImageInfo::MakeN32(widthHeight, widthHeight,
                                                        kOpaque_SkAlphaType);
          return SkSpecialSurface::MakeRaster(info);
      }
  }
  
  static sk_sp<SkSurface> create_surface(GrContext* context, int width, int height) {
      const SkImageInfo info = SkImageInfo::MakeN32(width, height, kOpaque_SkAlphaType);
      if (context) {
          return SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info);
      } else {
          return SkSurface::MakeRaster(info);
      }
  }
  
  static sk_sp<SkSpecialImage> create_empty_special_image(GrContext* context, int widthHeight) {
      sk_sp<SkSpecialSurface> surf(create_empty_special_surface(context, widthHeight));
  
      SkASSERT(surf);
  
      SkCanvas* canvas = surf->getCanvas();
      SkASSERT(canvas);
  
      canvas->clear(0x0);
  
      return surf->makeImageSnapshot();
  }
  
  
  DEF_TEST(ImageFilter, reporter) {
      {
          // Check that two non-clipping color-matrice-filters concatenate into a single filter.
          sk_sp<SkImageFilter> halfBrightness(make_scale(0.5f, nullptr));
          sk_sp<SkImageFilter> quarterBrightness(make_scale(0.5f, std::move(halfBrightness)));
          REPORTER_ASSERT(reporter, nullptr == quarterBrightness->getInput(0));
          SkColorFilter* cf;
          REPORTER_ASSERT(reporter, quarterBrightness->asColorFilter(&cf));
          REPORTER_ASSERT(reporter, cf->asColorMatrix(nullptr));
          cf->unref();
      }
  
      {
          // Check that a clipping color-matrice-filter followed by a color-matrice-filters
          // concatenates into a single filter, but not a matrixfilter (due to clamping).
          sk_sp<SkImageFilter> doubleBrightness(make_scale(2.0f, nullptr));
          sk_sp<SkImageFilter> halfBrightness(make_scale(0.5f, std::move(doubleBrightness)));
          REPORTER_ASSERT(reporter, nullptr == halfBrightness->getInput(0));
          SkColorFilter* cf;
          REPORTER_ASSERT(reporter, halfBrightness->asColorFilter(&cf));
          REPORTER_ASSERT(reporter, !cf->asColorMatrix(nullptr));
          cf->unref();
      }
  
      {
          // Check that a color filter image filter without a crop rect can be
          // expressed as a color filter.
          sk_sp<SkImageFilter> gray(make_grayscale(nullptr, nullptr));
          REPORTER_ASSERT(reporter, true == gray->asColorFilter(nullptr));
      }
  
      {
          // Check that a colorfilterimage filter without a crop rect but with an input
          // that is another colorfilterimage can be expressed as a colorfilter (composed).
          sk_sp<SkImageFilter> mode(make_blue(nullptr, nullptr));
          sk_sp<SkImageFilter> gray(make_grayscale(std::move(mode), nullptr));
          REPORTER_ASSERT(reporter, true == gray->asColorFilter(nullptr));
      }
  
      {
          // Test that if we exceed the limit of what ComposeColorFilter can combine, we still
          // can build the DAG and won't assert if we call asColorFilter.
          sk_sp<SkImageFilter> filter(make_blue(nullptr, nullptr));
          const int kWayTooManyForComposeColorFilter = 100;
          for (int i = 0; i < kWayTooManyForComposeColorFilter; ++i) {
              filter = make_blue(filter, nullptr);
              // the first few of these will succeed, but after we hit the internal limit,
              // it will then return false.
              (void)filter->asColorFilter(nullptr);
          }
      }
  
      {
          // Check that a color filter image filter with a crop rect cannot
          // be expressed as a color filter.
          SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(0, 0, 100, 100));
          sk_sp<SkImageFilter> grayWithCrop(make_grayscale(nullptr, &cropRect));
          REPORTER_ASSERT(reporter, false == grayWithCrop->asColorFilter(nullptr));
      }
  
      {
          // Check that two non-commutative matrices are concatenated in
          // the correct order.
          SkScalar blueToRedMatrix[20] = { 0 };
          blueToRedMatrix[2] = blueToRedMatrix[18] = SK_Scalar1;
          SkScalar redToGreenMatrix[20] = { 0 };
          redToGreenMatrix[5] = redToGreenMatrix[18] = SK_Scalar1;
          sk_sp<SkColorFilter> blueToRed(SkColorFilter::MakeMatrixFilterRowMajor255(blueToRedMatrix));
          sk_sp<SkImageFilter> filter1(SkColorFilterImageFilter::Make(std::move(blueToRed),
                                                                      nullptr));
          sk_sp<SkColorFilter> redToGreen(SkColorFilter::MakeMatrixFilterRowMajor255(redToGreenMatrix));
          sk_sp<SkImageFilter> filter2(SkColorFilterImageFilter::Make(std::move(redToGreen),
                                                                      std::move(filter1)));
  
          SkBitmap result;
          result.allocN32Pixels(kBitmapSize, kBitmapSize);
  
          SkPaint paint;
          paint.setColor(SK_ColorBLUE);
          paint.setImageFilter(std::move(filter2));
          SkCanvas canvas(result);
          canvas.clear(0x0);
          SkRect rect = SkRect::Make(SkIRect::MakeWH(kBitmapSize, kBitmapSize));
          canvas.drawRect(rect, paint);
          uint32_t pixel = *result.getAddr32(0, 0);
          // The result here should be green, since we have effectively shifted blue to green.
          REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
      }
  
      {
          // Tests pass by not asserting
          sk_sp<SkImage> image(make_small_image());
          SkBitmap result;
          result.allocN32Pixels(kBitmapSize, kBitmapSize);
  
          {
              // This tests for :
              // 1 ) location at (0,0,1)
              SkPoint3 location = SkPoint3::Make(0, 0, SK_Scalar1);
              // 2 ) location and target at same value
              SkPoint3 target = SkPoint3::Make(location.fX, location.fY, location.fZ);
              // 3 ) large negative specular exponent value
              SkScalar specularExponent = -1000;
  
              sk_sp<SkImageFilter> bmSrc(SkImageSource::Make(std::move(image)));
              SkPaint paint;
              paint.setImageFilter(SkLightingImageFilter::MakeSpotLitSpecular(
                      location, target, specularExponent, 180,
                      0xFFFFFFFF, SK_Scalar1, SK_Scalar1, SK_Scalar1,
                      std::move(bmSrc)));
              SkCanvas canvas(result);
              SkRect r = SkRect::MakeWH(SkIntToScalar(kBitmapSize),
                                        SkIntToScalar(kBitmapSize));
              canvas.drawRect(r, paint);
          }
      }
  }
  
  static void test_crop_rects(skiatest::Reporter* reporter,
                              GrContext* context) {
      // Check that all filters offset to their absolute crop rect,
      // unaffected by the input crop rect.
      // Tests pass by not asserting.
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 100));
      SkASSERT(srcImg);
  
      SkImageFilter::CropRect inputCropRect(SkRect::MakeXYWH(8, 13, 80, 80));
      SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(20, 30, 60, 60));
      sk_sp<SkImageFilter> input(make_grayscale(nullptr, &inputCropRect));
  
      FilterList filters(input, &cropRect);
  
      for (int i = 0; i < filters.count(); ++i) {
          SkImageFilter* filter = filters.getFilter(i);
          SkIPoint offset;
          SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
          SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, noColorSpace);
          sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg.get(), ctx, &offset));
          REPORTER_ASSERT(reporter, resultImg, filters.getName(i));
          REPORTER_ASSERT(reporter, offset.fX == 20 && offset.fY == 30, filters.getName(i));
      }
  }
  
  static void test_negative_blur_sigma(skiatest::Reporter* reporter,
                                       GrContext* context) {
      // Check that SkBlurImageFilter will accept a negative sigma, either in
      // the given arguments or after CTM application.
      const int width = 32, height = 32;
      const SkScalar five = SkIntToScalar(5);
  
      sk_sp<SkImageFilter> positiveFilter(SkBlurImageFilter::Make(five, five, nullptr));
      sk_sp<SkImageFilter> negativeFilter(SkBlurImageFilter::Make(-five, five, nullptr));
  
      SkBitmap gradient = make_gradient_circle(width, height);
      sk_sp<SkSpecialImage> imgSrc(SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(width, height),
                                                                  gradient));
  
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(32, 32), nullptr, noColorSpace);
  
      sk_sp<SkSpecialImage> positiveResult1(positiveFilter->filterImage(imgSrc.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, positiveResult1);
  
      sk_sp<SkSpecialImage> negativeResult1(negativeFilter->filterImage(imgSrc.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, negativeResult1);
  
      SkMatrix negativeScale;
      negativeScale.setScale(-SK_Scalar1, SK_Scalar1);
      SkImageFilter::Context negativeCTX(negativeScale, SkIRect::MakeWH(32, 32), nullptr,
                                         noColorSpace);
  
      sk_sp<SkSpecialImage> negativeResult2(positiveFilter->filterImage(imgSrc.get(),
                                                                        negativeCTX,
                                                                        &offset));
      REPORTER_ASSERT(reporter, negativeResult2);
  
      sk_sp<SkSpecialImage> positiveResult2(negativeFilter->filterImage(imgSrc.get(),
                                                                        negativeCTX,
                                                                        &offset));
      REPORTER_ASSERT(reporter, positiveResult2);
  
  
      SkBitmap positiveResultBM1, positiveResultBM2;
      SkBitmap negativeResultBM1, negativeResultBM2;
  
      REPORTER_ASSERT(reporter, positiveResult1->getROPixels(&positiveResultBM1));
      REPORTER_ASSERT(reporter, positiveResult2->getROPixels(&positiveResultBM2));
      REPORTER_ASSERT(reporter, negativeResult1->getROPixels(&negativeResultBM1));
      REPORTER_ASSERT(reporter, negativeResult2->getROPixels(&negativeResultBM2));
  
      for (int y = 0; y < height; y++) {
          int diffs = memcmp(positiveResultBM1.getAddr32(0, y),
                             negativeResultBM1.getAddr32(0, y),
                             positiveResultBM1.rowBytes());
          REPORTER_ASSERT(reporter, !diffs);
          if (diffs) {
              break;
          }
          diffs = memcmp(positiveResultBM1.getAddr32(0, y),
                         negativeResultBM2.getAddr32(0, y),
                         positiveResultBM1.rowBytes());
          REPORTER_ASSERT(reporter, !diffs);
          if (diffs) {
              break;
          }
          diffs = memcmp(positiveResultBM1.getAddr32(0, y),
                         positiveResultBM2.getAddr32(0, y),
                         positiveResultBM1.rowBytes());
          REPORTER_ASSERT(reporter, !diffs);
          if (diffs) {
              break;
          }
      }
  }
  
  DEF_TEST(ImageFilterNegativeBlurSigma, reporter) {
      test_negative_blur_sigma(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterNegativeBlurSigma_Gpu, reporter, ctxInfo) {
      test_negative_blur_sigma(reporter, ctxInfo.grContext());
  }
  
  static void test_zero_blur_sigma(skiatest::Reporter* reporter, GrContext* context) {
      // Check that SkBlurImageFilter with a zero sigma and a non-zero srcOffset works correctly.
      SkImageFilter::CropRect cropRect(SkRect::Make(SkIRect::MakeXYWH(5, 0, 5, 10)));
      sk_sp<SkImageFilter> input(SkOffsetImageFilter::Make(0, 0, nullptr, &cropRect));
      sk_sp<SkImageFilter> filter(SkBlurImageFilter::Make(0, 0, std::move(input), &cropRect));
  
      sk_sp<SkSpecialSurface> surf(create_empty_special_surface(context, 10));
      surf->getCanvas()->clear(SK_ColorGREEN);
      sk_sp<SkSpecialImage> image(surf->makeImageSnapshot());
  
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(32, 32), nullptr, noColorSpace);
  
      sk_sp<SkSpecialImage> result(filter->filterImage(image.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, offset.fX == 5 && offset.fY == 0);
      REPORTER_ASSERT(reporter, result);
      REPORTER_ASSERT(reporter, result->width() == 5 && result->height() == 10);
  
      SkBitmap resultBM;
  
      REPORTER_ASSERT(reporter, result->getROPixels(&resultBM));
  
      for (int y = 0; y < resultBM.height(); y++) {
          for (int x = 0; x < resultBM.width(); x++) {
              bool diff = *resultBM.getAddr32(x, y) != SK_ColorGREEN;
              REPORTER_ASSERT(reporter, !diff);
              if (diff) {
                  break;
              }
          }
      }
  }
  
  DEF_TEST(ImageFilterZeroBlurSigma, reporter) {
      test_zero_blur_sigma(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterZeroBlurSigma_Gpu, reporter, ctxInfo) {
      test_zero_blur_sigma(reporter, ctxInfo.grContext());
  }
  
  
  // Tests that, even when an upstream filter has returned null (due to failure or clipping), a
  // downstream filter that affects transparent black still does so even with a nullptr input.
  static void test_fail_affects_transparent_black(skiatest::Reporter* reporter, GrContext* context) {
      sk_sp<FailImageFilter> failFilter(new FailImageFilter());
      sk_sp<SkSpecialImage> source(create_empty_special_image(context, 5));
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeXYWH(0, 0, 1, 1), nullptr, noColorSpace);
      sk_sp<SkColorFilter> green(SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkBlendMode::kSrc));
      SkASSERT(green->affectsTransparentBlack());
      sk_sp<SkImageFilter> greenFilter(SkColorFilterImageFilter::Make(std::move(green),
                                                                      std::move(failFilter)));
      SkIPoint offset;
      sk_sp<SkSpecialImage> result(greenFilter->filterImage(source.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, nullptr != result.get());
      if (result.get()) {
          SkBitmap resultBM;
          REPORTER_ASSERT(reporter, result->getROPixels(&resultBM));
          REPORTER_ASSERT(reporter, *resultBM.getAddr32(0, 0) == SK_ColorGREEN);
      }
  }
  
  DEF_TEST(ImageFilterFailAffectsTransparentBlack, reporter) {
      test_fail_affects_transparent_black(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterFailAffectsTransparentBlack_Gpu, reporter, ctxInfo) {
      test_fail_affects_transparent_black(reporter, ctxInfo.grContext());
  }
  
  DEF_TEST(ImageFilterDrawTiled, reporter) {
      // Check that all filters when drawn tiled (with subsequent clip rects) exactly
      // match the same filters drawn with a single full-canvas bitmap draw.
      // Tests pass by not asserting.
  
      FilterList filters(nullptr);
  
      SkBitmap untiledResult, tiledResult;
      const int width = 64, height = 64;
      untiledResult.allocN32Pixels(width, height);
      tiledResult.allocN32Pixels(width, height);
      SkCanvas tiledCanvas(tiledResult);
      SkCanvas untiledCanvas(untiledResult);
      const int tileSize = 8;
  
      SkPaint textPaint;
      textPaint.setTextSize(SkIntToScalar(height));
      textPaint.setColor(SK_ColorWHITE);
  
      const char* text = "ABC";
      const SkScalar yPos = SkIntToScalar(height);
  
      for (int scale = 1; scale <= 2; ++scale) {
          for (int i = 0; i < filters.count(); ++i) {
              SkPaint combinedPaint;
              combinedPaint.setTextSize(SkIntToScalar(height));
              combinedPaint.setColor(SK_ColorWHITE);
              combinedPaint.setImageFilter(sk_ref_sp(filters.getFilter(i)));
  
              untiledCanvas.clear(SK_ColorTRANSPARENT);
              untiledCanvas.save();
              untiledCanvas.scale(SkIntToScalar(scale), SkIntToScalar(scale));
              untiledCanvas.drawString(text, 0, yPos, combinedPaint);
              untiledCanvas.restore();
              untiledCanvas.flush();
  
              tiledCanvas.clear(SK_ColorTRANSPARENT);
              for (int y = 0; y < height; y += tileSize) {
                  for (int x = 0; x < width; x += tileSize) {
                      tiledCanvas.save();
                      const SkRect clipRect = SkRect::MakeXYWH(x, y, tileSize, tileSize);
                      tiledCanvas.clipRect(clipRect);
                      if (filters.needsSaveLayer(i)) {
                          const SkRect layerBounds = SkRect::MakeWH(width, height);
                          tiledCanvas.saveLayer(&layerBounds, &combinedPaint);
                              tiledCanvas.scale(SkIntToScalar(scale), SkIntToScalar(scale));
                              tiledCanvas.drawString(text, 0, yPos, textPaint);
                          tiledCanvas.restore();
                      } else {
                          tiledCanvas.scale(SkIntToScalar(scale), SkIntToScalar(scale));
                          tiledCanvas.drawString(text, 0, yPos, combinedPaint);
                      }
  
                      tiledCanvas.restore();
                  }
              }
              tiledCanvas.flush();
  
              if (!sk_tool_utils::equal_pixels(untiledResult, tiledResult, 1)) {
                  REPORTER_ASSERT(reporter, false, filters.getName(i));
                  break;
              }
          }
      }
  }
  
  static void draw_saveLayer_picture(int width, int height, int tileSize,
                                     SkBBHFactory* factory, SkBitmap* result) {
  
      SkMatrix matrix;
      matrix.setTranslate(SkIntToScalar(50), 0);
  
      sk_sp<SkColorFilter> cf(SkColorFilter::MakeModeFilter(SK_ColorWHITE, SkBlendMode::kSrc));
      sk_sp<SkImageFilter> cfif(SkColorFilterImageFilter::Make(std::move(cf), nullptr));
      sk_sp<SkImageFilter> imageFilter(SkImageFilter::MakeMatrixFilter(matrix,
                                                                       kNone_SkFilterQuality,
                                                                       std::move(cfif)));
  
      SkPaint paint;
      paint.setImageFilter(std::move(imageFilter));
      SkPictureRecorder recorder;
      SkRect bounds = SkRect::Make(SkIRect::MakeXYWH(0, 0, 50, 50));
      SkCanvas* recordingCanvas = recorder.beginRecording(SkIntToScalar(width),
                                                          SkIntToScalar(height),
                                                          factory, 0);
      recordingCanvas->translate(-55, 0);
      recordingCanvas->saveLayer(&bounds, &paint);
      recordingCanvas->restore();
      sk_sp<SkPicture> picture1(recorder.finishRecordingAsPicture());
  
      result->allocN32Pixels(width, height);
      SkCanvas canvas(*result);
      canvas.clear(0);
      canvas.clipRect(SkRect::Make(SkIRect::MakeWH(tileSize, tileSize)));
      canvas.drawPicture(picture1.get());
  }
  
  DEF_TEST(ImageFilterDrawMatrixBBH, reporter) {
      // Check that matrix filter when drawn tiled with BBH exactly
      // matches the same thing drawn without BBH.
      // Tests pass by not asserting.
  
      const int width = 200, height = 200;
      const int tileSize = 100;
      SkBitmap result1, result2;
      SkRTreeFactory factory;
  
      draw_saveLayer_picture(width, height, tileSize, &factory, &result1);
      draw_saveLayer_picture(width, height, tileSize, nullptr, &result2);
  
      for (int y = 0; y < height; y++) {
          int diffs = memcmp(result1.getAddr32(0, y), result2.getAddr32(0, y), result1.rowBytes());
          REPORTER_ASSERT(reporter, !diffs);
          if (diffs) {
              break;
          }
      }
  }
  
  static sk_sp<SkImageFilter> make_blur(sk_sp<SkImageFilter> input) {
      return SkBlurImageFilter::Make(SK_Scalar1, SK_Scalar1, std::move(input));
  }
  
  static sk_sp<SkImageFilter> make_drop_shadow(sk_sp<SkImageFilter> input) {
      return SkDropShadowImageFilter::Make(
          SkIntToScalar(100), SkIntToScalar(100),
          SkIntToScalar(10), SkIntToScalar(10),
          SK_ColorBLUE, SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
          std::move(input));
  }
  
  DEF_TEST(ImageFilterBlurThenShadowBounds, reporter) {
      sk_sp<SkImageFilter> filter1(make_blur(nullptr));
      sk_sp<SkImageFilter> filter2(make_drop_shadow(std::move(filter1)));
  
      SkIRect bounds = SkIRect::MakeXYWH(0, 0, 100, 100);
      SkIRect expectedBounds = SkIRect::MakeXYWH(-133, -133, 236, 236);
      bounds = filter2->filterBounds(bounds, SkMatrix::I(),
                                     SkImageFilter::kReverse_MapDirection, &bounds);
  
      REPORTER_ASSERT(reporter, bounds == expectedBounds);
  }
  
  DEF_TEST(ImageFilterShadowThenBlurBounds, reporter) {
      sk_sp<SkImageFilter> filter1(make_drop_shadow(nullptr));
      sk_sp<SkImageFilter> filter2(make_blur(std::move(filter1)));
  
      SkIRect bounds = SkIRect::MakeXYWH(0, 0, 100, 100);
      SkIRect expectedBounds = SkIRect::MakeXYWH(-133, -133, 236, 236);
      bounds = filter2->filterBounds(bounds, SkMatrix::I(),
                                     SkImageFilter::kReverse_MapDirection, &bounds);
  
      REPORTER_ASSERT(reporter, bounds == expectedBounds);
  }
  
  DEF_TEST(ImageFilterDilateThenBlurBounds, reporter) {
      sk_sp<SkImageFilter> filter1(SkDilateImageFilter::Make(2, 2, nullptr));
      sk_sp<SkImageFilter> filter2(make_drop_shadow(std::move(filter1)));
  
      SkIRect bounds = SkIRect::MakeXYWH(0, 0, 100, 100);
      SkIRect expectedBounds = SkIRect::MakeXYWH(-132, -132, 234, 234);
      bounds = filter2->filterBounds(bounds, SkMatrix::I(),
                                     SkImageFilter::kReverse_MapDirection, &bounds);
  
      REPORTER_ASSERT(reporter, bounds == expectedBounds);
  }
  
  DEF_TEST(ImageFilterScaledBlurRadius, reporter) {
      // Each blur should spread 3*sigma, so 3 for the blur and 30 for the shadow
      // (before the CTM). Bounds should be computed correctly in the presence of
      // a (possibly negative) scale.
      sk_sp<SkImageFilter> blur(make_blur(nullptr));
      sk_sp<SkImageFilter> dropShadow(make_drop_shadow(nullptr));
      {
          // Uniform scale by 2.
          SkMatrix scaleMatrix;
          scaleMatrix.setScale(2, 2);
          SkIRect bounds = SkIRect::MakeLTRB(0, 0, 200, 200);
  
          SkIRect expectedBlurBounds = SkIRect::MakeLTRB(-6, -6, 206, 206);
          SkIRect blurBounds = blur->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kForward_MapDirection, nullptr);
          REPORTER_ASSERT(reporter, blurBounds == expectedBlurBounds);
          SkIRect reverseBlurBounds = blur->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kReverse_MapDirection, &bounds);
          REPORTER_ASSERT(reporter, reverseBlurBounds == expectedBlurBounds);
  
          SkIRect expectedShadowBounds = SkIRect::MakeLTRB(0, 0, 460, 460);
          SkIRect shadowBounds = dropShadow->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kForward_MapDirection, nullptr);
          REPORTER_ASSERT(reporter, shadowBounds == expectedShadowBounds);
          SkIRect expectedReverseShadowBounds =
              SkIRect::MakeLTRB(-260, -260, 200, 200);
          SkIRect reverseShadowBounds = dropShadow->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kReverse_MapDirection, &bounds);
          REPORTER_ASSERT(reporter,
              reverseShadowBounds == expectedReverseShadowBounds);
      }
      {
          // Vertical flip.
          SkMatrix scaleMatrix;
          scaleMatrix.setScale(1, -1);
          SkIRect bounds = SkIRect::MakeLTRB(0, -100, 100, 0);
  
          SkIRect expectedBlurBounds = SkIRect::MakeLTRB(-3, -103, 103, 3);
          SkIRect blurBounds = blur->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kForward_MapDirection, nullptr);
          REPORTER_ASSERT(reporter, blurBounds == expectedBlurBounds);
          SkIRect reverseBlurBounds = blur->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kReverse_MapDirection, &bounds);
          REPORTER_ASSERT(reporter, reverseBlurBounds == expectedBlurBounds);
  
          SkIRect expectedShadowBounds = SkIRect::MakeLTRB(0, -230, 230, 0);
          SkIRect shadowBounds = dropShadow->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kForward_MapDirection, nullptr);
          REPORTER_ASSERT(reporter, shadowBounds == expectedShadowBounds);
          SkIRect expectedReverseShadowBounds =
              SkIRect::MakeLTRB(-130, -100, 100, 130);
          SkIRect reverseShadowBounds = dropShadow->filterBounds(
              bounds, scaleMatrix, SkImageFilter::kReverse_MapDirection, &bounds);
          REPORTER_ASSERT(reporter,
              reverseShadowBounds == expectedReverseShadowBounds);
      }
  }
  
  DEF_TEST(ImageFilterComposedBlurFastBounds, reporter) {
      sk_sp<SkImageFilter> filter1(make_blur(nullptr));
      sk_sp<SkImageFilter> filter2(make_blur(nullptr));
      sk_sp<SkImageFilter> composedFilter(SkComposeImageFilter::Make(std::move(filter1),
                                                                     std::move(filter2)));
  
      SkRect boundsSrc = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
      SkRect expectedBounds = SkRect::MakeXYWH(
          SkIntToScalar(-6), SkIntToScalar(-6), SkIntToScalar(112), SkIntToScalar(112));
      SkRect boundsDst = composedFilter->computeFastBounds(boundsSrc);
  
      REPORTER_ASSERT(reporter, boundsDst == expectedBounds);
  }
  
  DEF_TEST(ImageFilterUnionBounds, reporter) {
      sk_sp<SkImageFilter> offset(SkOffsetImageFilter::Make(50, 0, nullptr));
      // Regardless of which order they appear in, the image filter bounds should
      // be combined correctly.
      {
          sk_sp<SkImageFilter> composite(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, offset));
          SkRect bounds = SkRect::MakeWH(100, 100);
          // Intentionally aliasing here, as that's what the real callers do.
          bounds = composite->computeFastBounds(bounds);
          REPORTER_ASSERT(reporter, bounds == SkRect::MakeWH(150, 100));
      }
      {
          sk_sp<SkImageFilter> composite(SkXfermodeImageFilter::Make(SkBlendMode::kSrcOver, nullptr,
                                                                     offset, nullptr));
          SkRect bounds = SkRect::MakeWH(100, 100);
          // Intentionally aliasing here, as that's what the real callers do.
          bounds = composite->computeFastBounds(bounds);
          REPORTER_ASSERT(reporter, bounds == SkRect::MakeWH(150, 100));
      }
  }
  
  static void test_imagefilter_merge_result_size(skiatest::Reporter* reporter, GrContext* context) {
      SkBitmap greenBM;
      greenBM.allocN32Pixels(20, 20);
      greenBM.eraseColor(SK_ColorGREEN);
      sk_sp<SkImage> greenImage(SkImage::MakeFromBitmap(greenBM));
      sk_sp<SkImageFilter> source(SkImageSource::Make(std::move(greenImage)));
      sk_sp<SkImageFilter> merge(SkMergeImageFilter::Make(source, source));
  
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 1));
  
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeXYWH(0, 0, 100, 100), nullptr,
                                 noColorSpace);
      SkIPoint offset;
  
      sk_sp<SkSpecialImage> resultImg(merge->filterImage(srcImg.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, resultImg);
  
      REPORTER_ASSERT(reporter, resultImg->width() == 20 && resultImg->height() == 20);
  }
  
  DEF_TEST(ImageFilterMergeResultSize, reporter) {
      test_imagefilter_merge_result_size(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterMergeResultSize_Gpu, reporter, ctxInfo) {
      test_imagefilter_merge_result_size(reporter, ctxInfo.grContext());
  }
  
  static void draw_blurred_rect(SkCanvas* canvas) {
      SkPaint filterPaint;
      filterPaint.setColor(SK_ColorWHITE);
      filterPaint.setImageFilter(SkBlurImageFilter::Make(SkIntToScalar(8), 0, nullptr));
      canvas->saveLayer(nullptr, &filterPaint);
      SkPaint whitePaint;
      whitePaint.setColor(SK_ColorWHITE);
      canvas->drawRect(SkRect::Make(SkIRect::MakeWH(4, 4)), whitePaint);
      canvas->restore();
  }
  
  static void draw_picture_clipped(SkCanvas* canvas, const SkRect& clipRect, const SkPicture* picture) {
      canvas->save();
      canvas->clipRect(clipRect);
      canvas->drawPicture(picture);
      canvas->restore();
  }
  
  DEF_TEST(ImageFilterDrawTiledBlurRTree, reporter) {
      // Check that the blur filter when recorded with RTree acceleration,
      // and drawn tiled (with subsequent clip rects) exactly
      // matches the same filter drawn with without RTree acceleration.
      // This tests that the "bleed" from the blur into the otherwise-blank
      // tiles is correctly rendered.
      // Tests pass by not asserting.
  
      int width = 16, height = 8;
      SkBitmap result1, result2;
      result1.allocN32Pixels(width, height);
      result2.allocN32Pixels(width, height);
      SkCanvas canvas1(result1);
      SkCanvas canvas2(result2);
      int tileSize = 8;
  
      canvas1.clear(0);
      canvas2.clear(0);
  
      SkRTreeFactory factory;
  
      SkPictureRecorder recorder1, recorder2;
      // The only difference between these two pictures is that one has RTree aceleration.
      SkCanvas* recordingCanvas1 = recorder1.beginRecording(SkIntToScalar(width),
                                                            SkIntToScalar(height),
                                                            nullptr, 0);
      SkCanvas* recordingCanvas2 = recorder2.beginRecording(SkIntToScalar(width),
                                                            SkIntToScalar(height),
                                                            &factory, 0);
      draw_blurred_rect(recordingCanvas1);
      draw_blurred_rect(recordingCanvas2);
      sk_sp<SkPicture> picture1(recorder1.finishRecordingAsPicture());
      sk_sp<SkPicture> picture2(recorder2.finishRecordingAsPicture());
      for (int y = 0; y < height; y += tileSize) {
          for (int x = 0; x < width; x += tileSize) {
              SkRect tileRect = SkRect::Make(SkIRect::MakeXYWH(x, y, tileSize, tileSize));
              draw_picture_clipped(&canvas1, tileRect, picture1.get());
              draw_picture_clipped(&canvas2, tileRect, picture2.get());
          }
      }
      for (int y = 0; y < height; y++) {
          int diffs = memcmp(result1.getAddr32(0, y), result2.getAddr32(0, y), result1.rowBytes());
          REPORTER_ASSERT(reporter, !diffs);
          if (diffs) {
              break;
          }
      }
  }
  
  DEF_TEST(ImageFilterMatrixConvolution, reporter) {
      // Check that a 1x3 filter does not cause a spurious assert.
      SkScalar kernel[3] = {
          SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
      };
      SkISize kernelSize = SkISize::Make(1, 3);
      SkScalar gain = SK_Scalar1, bias = 0;
      SkIPoint kernelOffset = SkIPoint::Make(0, 0);
  
      sk_sp<SkImageFilter> filter(SkMatrixConvolutionImageFilter::Make(
                                              kernelSize, kernel,
                                              gain, bias, kernelOffset,
                                              SkMatrixConvolutionImageFilter::kRepeat_TileMode,
                                              false, nullptr));
  
      SkBitmap result;
      int width = 16, height = 16;
      result.allocN32Pixels(width, height);
      SkCanvas canvas(result);
      canvas.clear(0);
  
      SkPaint paint;
      paint.setImageFilter(std::move(filter));
      SkRect rect = SkRect::Make(SkIRect::MakeWH(width, height));
      canvas.drawRect(rect, paint);
  }
  
  DEF_TEST(ImageFilterMatrixConvolutionBorder, reporter) {
      // Check that a filter with borders outside the target bounds
      // does not crash.
      SkScalar kernel[3] = {
          0, 0, 0,
      };
      SkISize kernelSize = SkISize::Make(3, 1);
      SkScalar gain = SK_Scalar1, bias = 0;
      SkIPoint kernelOffset = SkIPoint::Make(2, 0);
  
      sk_sp<SkImageFilter> filter(SkMatrixConvolutionImageFilter::Make(
                                              kernelSize, kernel, gain, bias, kernelOffset,
                                              SkMatrixConvolutionImageFilter::kClamp_TileMode,
                                              true, nullptr));
  
      SkBitmap result;
  
      int width = 10, height = 10;
      result.allocN32Pixels(width, height);
      SkCanvas canvas(result);
      canvas.clear(0);
  
      SkPaint filterPaint;
      filterPaint.setImageFilter(std::move(filter));
      SkRect bounds = SkRect::MakeWH(1, 10);
      SkRect rect = SkRect::Make(SkIRect::MakeWH(width, height));
      SkPaint rectPaint;
      canvas.saveLayer(&bounds, &filterPaint);
      canvas.drawRect(rect, rectPaint);
      canvas.restore();
  }
  
  static void test_big_kernel(skiatest::Reporter* reporter, GrContext* context) {
      // Check that a kernel that is too big for the GPU still works
      SkScalar identityKernel[49] = {
          0, 0, 0, 0, 0, 0, 0,
          0, 0, 0, 0, 0, 0, 0,
          0, 0, 0, 0, 0, 0, 0,
          0, 0, 0, 1, 0, 0, 0,
          0, 0, 0, 0, 0, 0, 0,
          0, 0, 0, 0, 0, 0, 0,
          0, 0, 0, 0, 0, 0, 0
      };
      SkISize kernelSize = SkISize::Make(7, 7);
      SkScalar gain = SK_Scalar1, bias = 0;
      SkIPoint kernelOffset = SkIPoint::Make(0, 0);
  
      sk_sp<SkImageFilter> filter(SkMatrixConvolutionImageFilter::Make(
                                          kernelSize, identityKernel, gain, bias, kernelOffset,
                                          SkMatrixConvolutionImageFilter::kClamp_TileMode,
                                          true, nullptr));
  
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 100));
      SkASSERT(srcImg);
  
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, noColorSpace);
      sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, resultImg);
      REPORTER_ASSERT(reporter, SkToBool(context) == resultImg->isTextureBacked());
      REPORTER_ASSERT(reporter, resultImg->width() == 100 && resultImg->height() == 100);
      REPORTER_ASSERT(reporter, offset.fX == 0 && offset.fY == 0);
  }
  
  DEF_TEST(ImageFilterMatrixConvolutionBigKernel, reporter) {
      test_big_kernel(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterMatrixConvolutionBigKernel_Gpu,
                                     reporter, ctxInfo) {
      test_big_kernel(reporter, ctxInfo.grContext());
  }
  
  DEF_TEST(ImageFilterCropRect, reporter) {
      test_crop_rects(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterCropRect_Gpu, reporter, ctxInfo) {
      test_crop_rects(reporter, ctxInfo.grContext());
  }
  
  DEF_TEST(ImageFilterMatrix, reporter) {
      SkBitmap temp;
      temp.allocN32Pixels(100, 100);
      SkCanvas canvas(temp);
      canvas.scale(SkIntToScalar(2), SkIntToScalar(2));
  
      SkMatrix expectedMatrix = canvas.getTotalMatrix();
  
      SkRTreeFactory factory;
      SkPictureRecorder recorder;
      SkCanvas* recordingCanvas = recorder.beginRecording(100, 100, &factory, 0);
  
      SkPaint paint;
      paint.setImageFilter(MatrixTestImageFilter::Make(reporter, expectedMatrix));
      recordingCanvas->saveLayer(nullptr, &paint);
      SkPaint solidPaint;
      solidPaint.setColor(0xFFFFFFFF);
      recordingCanvas->save();
      recordingCanvas->scale(SkIntToScalar(10), SkIntToScalar(10));
      recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeWH(100, 100)), solidPaint);
      recordingCanvas->restore(); // scale
      recordingCanvas->restore(); // saveLayer
  
      canvas.drawPicture(recorder.finishRecordingAsPicture());
  }
  
  static void test_clipped_picture_imagefilter(skiatest::Reporter* reporter, GrContext* context) {
      sk_sp<SkPicture> picture;
  
      {
          SkRTreeFactory factory;
          SkPictureRecorder recorder;
          SkCanvas* recordingCanvas = recorder.beginRecording(1, 1, &factory, 0);
  
          // Create an SkPicture which simply draws a green 1x1 rectangle.
          SkPaint greenPaint;
          greenPaint.setColor(SK_ColorGREEN);
          recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeWH(1, 1)), greenPaint);
          picture = recorder.finishRecordingAsPicture();
      }
  
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 2));
  
      sk_sp<SkImageFilter> imageFilter(SkPictureImageFilter::Make(picture));
  
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeXYWH(1, 1, 1, 1), nullptr, noColorSpace);
  
      sk_sp<SkSpecialImage> resultImage(imageFilter->filterImage(srcImg.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, !resultImage);
  }
  
  DEF_TEST(ImageFilterClippedPictureImageFilter, reporter) {
      test_clipped_picture_imagefilter(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterClippedPictureImageFilter_Gpu, reporter, ctxInfo) {
      test_clipped_picture_imagefilter(reporter, ctxInfo.grContext());
  }
  
  DEF_TEST(ImageFilterEmptySaveLayer, reporter) {
      // Even when there's an empty saveLayer()/restore(), ensure that an image
      // filter or color filter which affects transparent black still draws.
  
      SkBitmap bitmap;
      bitmap.allocN32Pixels(10, 10);
      SkCanvas canvas(bitmap);
  
      SkRTreeFactory factory;
      SkPictureRecorder recorder;
  
      sk_sp<SkColorFilter> green(SkColorFilter::MakeModeFilter(SK_ColorGREEN,
                                                               SkBlendMode::kSrc));
      sk_sp<SkImageFilter> imageFilter(SkColorFilterImageFilter::Make(green, nullptr));
      SkPaint imageFilterPaint;
      imageFilterPaint.setImageFilter(std::move(imageFilter));
      SkPaint colorFilterPaint;
      colorFilterPaint.setColorFilter(green);
  
      SkRect bounds = SkRect::MakeWH(10, 10);
  
      SkCanvas* recordingCanvas = recorder.beginRecording(10, 10, &factory, 0);
      recordingCanvas->saveLayer(&bounds, &imageFilterPaint);
      recordingCanvas->restore();
      sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
  
      canvas.clear(0);
      canvas.drawPicture(picture);
      uint32_t pixel = *bitmap.getAddr32(0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  
      recordingCanvas = recorder.beginRecording(10, 10, &factory, 0);
      recordingCanvas->saveLayer(nullptr, &imageFilterPaint);
      recordingCanvas->restore();
      sk_sp<SkPicture> picture2(recorder.finishRecordingAsPicture());
  
      canvas.clear(0);
      canvas.drawPicture(picture2);
      pixel = *bitmap.getAddr32(0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  
      recordingCanvas = recorder.beginRecording(10, 10, &factory, 0);
      recordingCanvas->saveLayer(&bounds, &colorFilterPaint);
      recordingCanvas->restore();
      sk_sp<SkPicture> picture3(recorder.finishRecordingAsPicture());
  
      canvas.clear(0);
      canvas.drawPicture(picture3);
      pixel = *bitmap.getAddr32(0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  }
  
  static void test_huge_blur(SkCanvas* canvas, skiatest::Reporter* reporter) {
      SkBitmap bitmap;
      bitmap.allocN32Pixels(100, 100);
      bitmap.eraseARGB(0, 0, 0, 0);
  
      // Check that a blur with an insane radius does not crash or assert.
      SkPaint paint;
      paint.setImageFilter(SkBlurImageFilter::Make(SkIntToScalar(1<<30),
                                                   SkIntToScalar(1<<30),
                                                   nullptr));
      canvas->drawBitmap(bitmap, 0, 0, &paint);
  }
  
  DEF_TEST(HugeBlurImageFilter, reporter) {
      SkBitmap temp;
      temp.allocN32Pixels(100, 100);
      SkCanvas canvas(temp);
      test_huge_blur(&canvas, reporter);
  }
  
  DEF_TEST(ImageFilterMatrixConvolutionSanityTest, reporter) {
      SkScalar kernel[1] = { 0 };
      SkScalar gain = SK_Scalar1, bias = 0;
      SkIPoint kernelOffset = SkIPoint::Make(1, 1);
  
      // Check that an enormous (non-allocatable) kernel gives a nullptr filter.
      sk_sp<SkImageFilter> conv(SkMatrixConvolutionImageFilter::Make(
          SkISize::Make(1<<30, 1<<30),
          kernel,
          gain,
          bias,
          kernelOffset,
          SkMatrixConvolutionImageFilter::kRepeat_TileMode,
          false,
          nullptr));
  
      REPORTER_ASSERT(reporter, nullptr == conv.get());
  
      // Check that a nullptr kernel gives a nullptr filter.
      conv = SkMatrixConvolutionImageFilter::Make(
          SkISize::Make(1, 1),
          nullptr,
          gain,
          bias,
          kernelOffset,
          SkMatrixConvolutionImageFilter::kRepeat_TileMode,
          false,
          nullptr);
  
      REPORTER_ASSERT(reporter, nullptr == conv.get());
  
      // Check that a kernel width < 1 gives a nullptr filter.
      conv = SkMatrixConvolutionImageFilter::Make(
          SkISize::Make(0, 1),
          kernel,
          gain,
          bias,
          kernelOffset,
          SkMatrixConvolutionImageFilter::kRepeat_TileMode,
          false,
          nullptr);
  
      REPORTER_ASSERT(reporter, nullptr == conv.get());
  
      // Check that kernel height < 1 gives a nullptr filter.
      conv = SkMatrixConvolutionImageFilter::Make(
          SkISize::Make(1, -1),
          kernel,
          gain,
          bias,
          kernelOffset,
          SkMatrixConvolutionImageFilter::kRepeat_TileMode,
          false,
          nullptr);
  
      REPORTER_ASSERT(reporter, nullptr == conv.get());
  }
  
  static void test_xfermode_cropped_input(SkSurface* surf, skiatest::Reporter* reporter) {
      auto canvas = surf->getCanvas();
      canvas->clear(0);
  
      SkBitmap bitmap;
      bitmap.allocN32Pixels(1, 1);
      bitmap.eraseARGB(255, 255, 255, 255);
  
      sk_sp<SkColorFilter> green(SkColorFilter::MakeModeFilter(SK_ColorGREEN,
                                                               SkBlendMode::kSrcIn));
      sk_sp<SkImageFilter> greenFilter(SkColorFilterImageFilter::Make(green, nullptr));
      SkImageFilter::CropRect cropRect(SkRect::MakeEmpty());
      sk_sp<SkImageFilter> croppedOut(SkColorFilterImageFilter::Make(green, nullptr, &cropRect));
  
      // Check that an xfermode image filter whose input has been cropped out still draws the other
      // input. Also check that drawing with both inputs cropped out doesn't cause a GPU warning.
      SkBlendMode mode = SkBlendMode::kSrcOver;
      sk_sp<SkImageFilter> xfermodeNoFg(SkXfermodeImageFilter::Make(mode, greenFilter,
                                                                    croppedOut, nullptr));
      sk_sp<SkImageFilter> xfermodeNoBg(SkXfermodeImageFilter::Make(mode, croppedOut,
                                                                    greenFilter, nullptr));
      sk_sp<SkImageFilter> xfermodeNoFgNoBg(SkXfermodeImageFilter::Make(mode, croppedOut,
                                                                        croppedOut, nullptr));
  
      SkPaint paint;
      paint.setImageFilter(std::move(xfermodeNoFg));
      canvas->drawBitmap(bitmap, 0, 0, &paint);   // drawSprite
  
      uint32_t pixel;
      SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
      surf->readPixels(info, &pixel, 4, 0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  
      paint.setImageFilter(std::move(xfermodeNoBg));
      canvas->drawBitmap(bitmap, 0, 0, &paint);   // drawSprite
      surf->readPixels(info, &pixel, 4, 0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  
      paint.setImageFilter(std::move(xfermodeNoFgNoBg));
      canvas->drawBitmap(bitmap, 0, 0, &paint);   // drawSprite
      surf->readPixels(info, &pixel, 4, 0, 0);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  }
  
  DEF_TEST(ImageFilterNestedSaveLayer, reporter) {
      SkBitmap temp;
      temp.allocN32Pixels(50, 50);
      SkCanvas canvas(temp);
      canvas.clear(0x0);
  
      SkBitmap bitmap;
      bitmap.allocN32Pixels(10, 10);
      bitmap.eraseColor(SK_ColorGREEN);
  
      SkMatrix matrix;
      matrix.setScale(SkIntToScalar(2), SkIntToScalar(2));
      matrix.postTranslate(SkIntToScalar(-20), SkIntToScalar(-20));
      sk_sp<SkImageFilter> matrixFilter(
          SkImageFilter::MakeMatrixFilter(matrix, kLow_SkFilterQuality, nullptr));
  
      // Test that saveLayer() with a filter nested inside another saveLayer() applies the
      // correct offset to the filter matrix.
      SkRect bounds1 = SkRect::MakeXYWH(10, 10, 30, 30);
      canvas.saveLayer(&bounds1, nullptr);
      SkPaint filterPaint;
      filterPaint.setImageFilter(std::move(matrixFilter));
      SkRect bounds2 = SkRect::MakeXYWH(20, 20, 10, 10);
      canvas.saveLayer(&bounds2, &filterPaint);
      SkPaint greenPaint;
      greenPaint.setColor(SK_ColorGREEN);
      canvas.drawRect(bounds2, greenPaint);
      canvas.restore();
      canvas.restore();
      SkPaint strokePaint;
      strokePaint.setStyle(SkPaint::kStroke_Style);
      strokePaint.setColor(SK_ColorRED);
  
      SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
      uint32_t pixel;
      temp.readPixels(info, &pixel, 4, 25, 25);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  
      // Test that drawSprite() with a filter nested inside a saveLayer() applies the
      // correct offset to the filter matrix.
      canvas.clear(0x0);
      temp.readPixels(info, &pixel, 4, 25, 25);
      canvas.saveLayer(&bounds1, nullptr);
      canvas.drawBitmap(bitmap, 20, 20, &filterPaint);    // drawSprite
      canvas.restore();
  
      temp.readPixels(info, &pixel, 4, 25, 25);
      REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
  }
  
  DEF_TEST(XfermodeImageFilterCroppedInput, reporter) {
      test_xfermode_cropped_input(SkSurface::MakeRasterN32Premul(100, 100).get(), reporter);
  }
  
  static void test_composed_imagefilter_offset(skiatest::Reporter* reporter, GrContext* context) {
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 100));
  
      SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(1, 0, 20, 20));
      sk_sp<SkImageFilter> offsetFilter(SkOffsetImageFilter::Make(0, 0, nullptr, &cropRect));
      sk_sp<SkImageFilter> blurFilter(SkBlurImageFilter::Make(SK_Scalar1, SK_Scalar1,
                                                              nullptr, &cropRect));
      sk_sp<SkImageFilter> composedFilter(SkComposeImageFilter::Make(std::move(blurFilter),
                                                                     std::move(offsetFilter)));
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, noColorSpace);
  
      sk_sp<SkSpecialImage> resultImg(composedFilter->filterImage(srcImg.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, resultImg);
      REPORTER_ASSERT(reporter, offset.fX == 1 && offset.fY == 0);
  }
  
  DEF_TEST(ComposedImageFilterOffset, reporter) {
      test_composed_imagefilter_offset(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ComposedImageFilterOffset_Gpu, reporter, ctxInfo) {
      test_composed_imagefilter_offset(reporter, ctxInfo.grContext());
  }
  
  static void test_composed_imagefilter_bounds(skiatest::Reporter* reporter, GrContext* context) {
      // The bounds passed to the inner filter must be filtered by the outer
      // filter, so that the inner filter produces the pixels that the outer
      // filter requires as input. This matters if the outer filter moves pixels.
      // Here, accounting for the outer offset is necessary so that the green
      // pixels of the picture are not clipped.
  
      SkPictureRecorder recorder;
      SkCanvas* recordingCanvas = recorder.beginRecording(SkRect::MakeWH(200, 100));
      recordingCanvas->clipRect(SkRect::MakeXYWH(100, 0, 100, 100));
      recordingCanvas->clear(SK_ColorGREEN);
      sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
      sk_sp<SkImageFilter> pictureFilter(SkPictureImageFilter::Make(picture));
      SkImageFilter::CropRect cropRect(SkRect::MakeWH(100, 100));
      sk_sp<SkImageFilter> offsetFilter(SkOffsetImageFilter::Make(-100, 0, nullptr, &cropRect));
      sk_sp<SkImageFilter> composedFilter(SkComposeImageFilter::Make(std::move(offsetFilter),
                                                                     std::move(pictureFilter)));
  
      sk_sp<SkSpecialImage> sourceImage(create_empty_special_image(context, 100));
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, noColorSpace);
      SkIPoint offset;
      sk_sp<SkSpecialImage> result(composedFilter->filterImage(sourceImage.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, offset.isZero());
      REPORTER_ASSERT(reporter, result);
      REPORTER_ASSERT(reporter, result->subset().size() == SkISize::Make(100, 100));
  
      SkBitmap resultBM;
      REPORTER_ASSERT(reporter, result->getROPixels(&resultBM));
      REPORTER_ASSERT(reporter, resultBM.getColor(50, 50) == SK_ColorGREEN);
  }
  
  DEF_TEST(ComposedImageFilterBounds, reporter) {
      test_composed_imagefilter_bounds(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ComposedImageFilterBounds_Gpu, reporter, ctxInfo) {
      test_composed_imagefilter_bounds(reporter, ctxInfo.grContext());
  }
  
  static void test_partial_crop_rect(skiatest::Reporter* reporter, GrContext* context) {
      sk_sp<SkSpecialImage> srcImg(create_empty_special_image(context, 100));
  
      SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(100, 0, 20, 30),
          SkImageFilter::CropRect::kHasWidth_CropEdge | SkImageFilter::CropRect::kHasHeight_CropEdge);
      sk_sp<SkImageFilter> filter(make_grayscale(nullptr, &cropRect));
      SkIPoint offset;
      SkImageFilter::OutputProperties noColorSpace(kN32_SkColorType, nullptr);
      SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeWH(100, 100), nullptr, noColorSpace);
  
      sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg.get(), ctx, &offset));
      REPORTER_ASSERT(reporter, resultImg);
  
      REPORTER_ASSERT(reporter, offset.fX == 0);
      REPORTER_ASSERT(reporter, offset.fY == 0);
      REPORTER_ASSERT(reporter, resultImg->width() == 20);
      REPORTER_ASSERT(reporter, resultImg->height() == 30);
  }
  
  DEF_TEST(ImageFilterPartialCropRect, reporter) {
      test_partial_crop_rect(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterPartialCropRect_Gpu, reporter, ctxInfo) {
      test_partial_crop_rect(reporter, ctxInfo.grContext());
  }
  
  DEF_TEST(ImageFilterCanComputeFastBounds, reporter) {
  
      {
          SkPoint3 location = SkPoint3::Make(0, 0, SK_Scalar1);
          sk_sp<SkImageFilter> lighting(SkLightingImageFilter::MakePointLitDiffuse(location,
                                                                                   SK_ColorGREEN,
                                                                                   0, 0, nullptr));
          REPORTER_ASSERT(reporter, !lighting->canComputeFastBounds());
      }
  
      {
          sk_sp<SkImageFilter> gray(make_grayscale(nullptr, nullptr));
          REPORTER_ASSERT(reporter, gray->canComputeFastBounds());
          {
              SkColorFilter* grayCF;
              REPORTER_ASSERT(reporter, gray->asAColorFilter(&grayCF));
              REPORTER_ASSERT(reporter, !grayCF->affectsTransparentBlack());
              grayCF->unref();
          }
          REPORTER_ASSERT(reporter, gray->canComputeFastBounds());
  
          sk_sp<SkImageFilter> grayBlur(SkBlurImageFilter::Make(SK_Scalar1, SK_Scalar1,
                                                                std::move(gray)));
          REPORTER_ASSERT(reporter, grayBlur->canComputeFastBounds());
      }
  
      {
          SkScalar greenMatrix[20] = { 0, 0, 0, 0, 0,
                                       0, 0, 0, 0, 1,
                                       0, 0, 0, 0, 0,
                                       0, 0, 0, 0, 1 };
          sk_sp<SkColorFilter> greenCF(SkColorFilter::MakeMatrixFilterRowMajor255(greenMatrix));
          sk_sp<SkImageFilter> green(SkColorFilterImageFilter::Make(greenCF, nullptr));
  
          REPORTER_ASSERT(reporter, greenCF->affectsTransparentBlack());
          REPORTER_ASSERT(reporter, !green->canComputeFastBounds());
  
          sk_sp<SkImageFilter> greenBlur(SkBlurImageFilter::Make(SK_Scalar1, SK_Scalar1,
                                                                 std::move(green)));
          REPORTER_ASSERT(reporter, !greenBlur->canComputeFastBounds());
      }
  
      uint8_t allOne[256], identity[256];
      for (int i = 0; i < 256; ++i) {
          identity[i] = i;
          allOne[i] = 255;
      }
  
      sk_sp<SkColorFilter> identityCF(SkTableColorFilter::MakeARGB(identity, identity,
                                                                   identity, allOne));
      sk_sp<SkImageFilter> identityFilter(SkColorFilterImageFilter::Make(identityCF, nullptr));
      REPORTER_ASSERT(reporter, !identityCF->affectsTransparentBlack());
      REPORTER_ASSERT(reporter, identityFilter->canComputeFastBounds());
  
      sk_sp<SkColorFilter> forceOpaqueCF(SkTableColorFilter::MakeARGB(allOne, identity,
                                                                      identity, identity));
      sk_sp<SkImageFilter> forceOpaque(SkColorFilterImageFilter::Make(forceOpaqueCF, nullptr));
      REPORTER_ASSERT(reporter, forceOpaqueCF->affectsTransparentBlack());
      REPORTER_ASSERT(reporter, !forceOpaque->canComputeFastBounds());
  }
  
  // Verify that SkImageSource survives serialization
  DEF_TEST(ImageFilterImageSourceSerialization, reporter) {
      auto surface(SkSurface::MakeRasterN32Premul(10, 10));
      surface->getCanvas()->clear(SK_ColorGREEN);
      sk_sp<SkImage> image(surface->makeImageSnapshot());
      sk_sp<SkImageFilter> filter(SkImageSource::Make(std::move(image)));
  
      sk_sp<SkData> data(filter->serialize());
      sk_sp<SkImageFilter> unflattenedFilter = SkImageFilter::Deserialize(data->data(), data->size());
      REPORTER_ASSERT(reporter, unflattenedFilter);
  
      SkBitmap bm;
      bm.allocN32Pixels(10, 10);
      bm.eraseColor(SK_ColorBLUE);
      SkPaint paint;
      paint.setColor(SK_ColorRED);
      paint.setImageFilter(unflattenedFilter);
  
      SkCanvas canvas(bm);
      canvas.drawRect(SkRect::MakeWH(10, 10), paint);
      REPORTER_ASSERT(reporter, *bm.getAddr32(0, 0) == SkPreMultiplyColor(SK_ColorGREEN));
  }
  
  DEF_TEST(ImageFilterImageSourceUninitialized, r) {
      sk_sp<SkData> data(GetResourceAsData("crbug769134.fil"));
      if (!data) {
          return;
      }
      sk_sp<SkImageFilter> unflattenedFilter = SkImageFilter::Deserialize(data->data(), data->size());
      // This will fail. More importantly, msan will verify that we did not
      // compare against uninitialized memory.
      REPORTER_ASSERT(r, !unflattenedFilter);
  }
  
  static void test_large_blur_input(skiatest::Reporter* reporter, SkCanvas* canvas) {
      SkBitmap largeBmp;
      int largeW = 5000;
      int largeH = 5000;
      // If we're GPU-backed make the bitmap too large to be converted into a texture.
      if (GrContext* ctx = canvas->getGrContext()) {
          largeW = ctx->contextPriv().caps()->maxTextureSize() + 1;
      }
  
      largeBmp.allocN32Pixels(largeW, largeH);
      largeBmp.eraseColor(0);
      if (!largeBmp.getPixels()) {
          ERRORF(reporter, "Failed to allocate large bmp.");
          return;
      }
  
      sk_sp<SkImage> largeImage(SkImage::MakeFromBitmap(largeBmp));
      if (!largeImage) {
          ERRORF(reporter, "Failed to create large image.");
          return;
      }
  
      sk_sp<SkImageFilter> largeSource(SkImageSource::Make(std::move(largeImage)));
      if (!largeSource) {
          ERRORF(reporter, "Failed to create large SkImageSource.");
          return;
      }
  
      sk_sp<SkImageFilter> blur(SkBlurImageFilter::Make(10.f, 10.f, std::move(largeSource)));
      if (!blur) {
          ERRORF(reporter, "Failed to create SkBlurImageFilter.");
          return;
      }
  
      SkPaint paint;
      paint.setImageFilter(std::move(blur));
  
      // This should not crash (http://crbug.com/570479).
      canvas->drawRect(SkRect::MakeIWH(largeW, largeH), paint);
  }
  
  DEF_TEST(ImageFilterBlurLargeImage, reporter) {
      auto surface(SkSurface::MakeRaster(SkImageInfo::MakeN32Premul(100, 100)));
      test_large_blur_input(reporter, surface->getCanvas());
  }
  
  static void test_make_with_filter(skiatest::Reporter* reporter, GrContext* context) {
      sk_sp<SkSurface> surface(create_surface(context, 192, 128));
      surface->getCanvas()->clear(SK_ColorRED);
      SkPaint bluePaint;
      bluePaint.setColor(SK_ColorBLUE);
      SkIRect subset = SkIRect::MakeXYWH(25, 20, 50, 50);
      surface->getCanvas()->drawRect(SkRect::Make(subset), bluePaint);
      sk_sp<SkImage> sourceImage = surface->makeImageSnapshot();
  
      sk_sp<SkImageFilter> filter = make_grayscale(nullptr, nullptr);
      SkIRect clipBounds = SkIRect::MakeXYWH(30, 35, 100, 100);
      SkIRect outSubset;
      SkIPoint offset;
      sk_sp<SkImage> result;
  
      result = sourceImage->makeWithFilter(nullptr, subset, clipBounds, &outSubset, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      result = sourceImage->makeWithFilter(filter.get(), subset, clipBounds, nullptr, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      result = sourceImage->makeWithFilter(filter.get(), subset, clipBounds, &outSubset, nullptr);
      REPORTER_ASSERT(reporter, !result);
  
      SkIRect bigSubset = SkIRect::MakeXYWH(-10000, -10000, 20000, 20000);
      result = sourceImage->makeWithFilter(filter.get(), bigSubset, clipBounds, &outSubset, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      SkIRect empty = SkIRect::MakeEmpty();
      result = sourceImage->makeWithFilter(filter.get(), empty, clipBounds, &outSubset, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      result = sourceImage->makeWithFilter(filter.get(), subset, empty, &outSubset, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      SkIRect leftField = SkIRect::MakeXYWH(-1000, 0, 100, 100);
      result = sourceImage->makeWithFilter(filter.get(), subset, leftField, &outSubset, &offset);
      REPORTER_ASSERT(reporter, !result);
  
      result = sourceImage->makeWithFilter(filter.get(), subset, clipBounds, &outSubset, &offset);
  
      REPORTER_ASSERT(reporter, result);
      REPORTER_ASSERT(reporter, result->bounds().contains(outSubset));
      SkIRect destRect = SkIRect::MakeXYWH(offset.x(), offset.y(),
                                            outSubset.width(), outSubset.height());
      REPORTER_ASSERT(reporter, clipBounds.contains(destRect));
  
      // In GPU-mode, this case creates a special image with a backing size that differs from
      // the content size
      {
          clipBounds.setXYWH(0, 0, 170, 100);
          subset.setXYWH(0, 0, 160, 90);
  
          filter = SkXfermodeImageFilter::Make(SkBlendMode::kSrc, nullptr);
          result = sourceImage->makeWithFilter(filter.get(), subset, clipBounds, &outSubset, &offset);
          REPORTER_ASSERT(reporter, result);
      }
  }
  
  DEF_TEST(ImageFilterMakeWithFilter, reporter) {
      test_make_with_filter(reporter, nullptr);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterMakeWithFilter_Gpu, reporter, ctxInfo) {
      test_make_with_filter(reporter, ctxInfo.grContext());
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageFilterHugeBlur_Gpu, reporter, ctxInfo) {
  
      sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(ctxInfo.grContext(),
                                                        SkBudgeted::kNo,
                                                        SkImageInfo::MakeN32Premul(100, 100)));
  
  
      SkCanvas* canvas = surf->getCanvas();
  
      test_huge_blur(canvas, reporter);
  }
  
  DEF_GPUTEST_FOR_RENDERING_CONTEXTS(XfermodeImageFilterCroppedInput_Gpu, reporter, ctxInfo) {
      sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(
              ctxInfo.grContext(),
              SkBudgeted::kNo,
              SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType)));
  
      test_xfermode_cropped_input(surf.get(), reporter);
  }
  
  DEF_GPUTEST_FOR_ALL_CONTEXTS(ImageFilterBlurLargeImage_Gpu, reporter, ctxInfo) {
      auto surface(SkSurface::MakeRenderTarget(
              ctxInfo.grContext(), SkBudgeted::kYes,
              SkImageInfo::Make(100, 100, kRGBA_8888_SkColorType, kPremul_SkAlphaType)));
      test_large_blur_input(reporter, surface->getCanvas());
  }
  
  /*
   *  Test that colorfilterimagefilter does not require its CTM to be decomposed when it has more
   *  than just scale/translate, but that other filters do.
   */
  DEF_TEST(ImageFilterComplexCTM, reporter) {
      // just need a colorfilter to exercise the corresponding imagefilter
      sk_sp<SkColorFilter> cf = SkColorFilter::MakeModeFilter(SK_ColorRED, SkBlendMode::kSrcATop);
      sk_sp<SkImageFilter> cfif = SkColorFilterImageFilter::Make(cf, nullptr);    // can handle
      sk_sp<SkImageFilter> blif = SkBlurImageFilter::Make(3, 3, nullptr);         // cannot handle
  
      struct {
          sk_sp<SkImageFilter> fFilter;
          bool                 fExpectCanHandle;
      } recs[] = {
          { cfif,                                     true  },
          { SkColorFilterImageFilter::Make(cf, cfif), true  },
          { SkMergeImageFilter::Make(cfif, cfif),     true  },
          { SkComposeImageFilter::Make(cfif, cfif),   true  },
  
          { blif,                                     false },
          { SkBlurImageFilter::Make(3, 3, cfif),      false },
          { SkColorFilterImageFilter::Make(cf, blif), false },
          { SkMergeImageFilter::Make(cfif, blif),     false },
          { SkComposeImageFilter::Make(blif, cfif),   false },
      };
  
      for (const auto& rec : recs) {
          const bool canHandle = rec.fFilter->canHandleComplexCTM();
          REPORTER_ASSERT(reporter, canHandle == rec.fExpectCanHandle);
      }
  }
  
  // Test that transforming the filter DAG doesn't clone shared nodes multiple times.
  DEF_TEST(ImageFilterColorSpaceDAG, reporter) {
  
      // Helper for counting makeColorSpace() clones.
      class TestFilter final : public SkImageFilter {
      public:
          TestFilter() : INHERITED(nullptr, 0, nullptr) {}
  
          Factory getFactory() const override { return nullptr; }
  
          size_t cloneCount() const { return fCloneCount; }
  
      protected:
          sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* src, const Context&,
                                              SkIPoint* offset) const override {
              return nullptr;
          }
          sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override {
              fCloneCount++;
              return sk_ref_sp(const_cast<TestFilter*>(this));
          }
  
      private:
          typedef SkImageFilter INHERITED;
  
          mutable size_t fCloneCount = 0;
      };
  
      auto filter = sk_make_sp<TestFilter>();
      REPORTER_ASSERT(reporter, filter->cloneCount() == 0u);
  
      // Build a DAG referencing the filter twice.
      auto complexFilter = SkMergeImageFilter::Make(filter, SkOffsetImageFilter::Make(1, 1, filter));
      REPORTER_ASSERT(reporter, filter->cloneCount() == 0u);
  
      auto xformer = SkColorSpaceXformer::Make(SkColorSpace::MakeSRGB());
      auto xformedFilter = xformer->apply(complexFilter.get());
  
      REPORTER_ASSERT(reporter, filter->cloneCount() == 1u);
  }
  
  // Test SkXfermodeImageFilter::filterBounds with different blending modes.
  DEF_TEST(XfermodeImageFilterBounds, reporter) {
      SkIRect background_rect = SkIRect::MakeXYWH(0, 0, 100, 100);
      SkIRect foreground_rect = SkIRect::MakeXYWH(50, 50, 100, 100);
      sk_sp<SkImageFilter> background(new FixedBoundsImageFilter(background_rect));
      sk_sp<SkImageFilter> foreground(new FixedBoundsImageFilter(foreground_rect));
  
      const int kModeCount = static_cast<int>(SkBlendMode::kLastMode) + 1;
      SkIRect expectedBounds[kModeCount];
      // Expect union of input rects by default.
      for (int i = 0; i < kModeCount; ++i) {
          expectedBounds[i] = background_rect;
          expectedBounds[i].join(foreground_rect);
      }
  
      SkIRect intersection = background_rect;
      intersection.intersect(foreground_rect);
      expectedBounds[static_cast<int>(SkBlendMode::kClear)] = SkIRect::MakeEmpty();
      expectedBounds[static_cast<int>(SkBlendMode::kSrc)] = foreground_rect;
      expectedBounds[static_cast<int>(SkBlendMode::kDst)] = background_rect;
      expectedBounds[static_cast<int>(SkBlendMode::kSrcIn)] = intersection;
      expectedBounds[static_cast<int>(SkBlendMode::kDstIn)] = intersection;
      expectedBounds[static_cast<int>(SkBlendMode::kSrcATop)] = background_rect;
      expectedBounds[static_cast<int>(SkBlendMode::kDstATop)] = foreground_rect;
  
      // The value of this variable doesn't matter because we use inputs with fixed bounds.
      SkIRect src = SkIRect::MakeXYWH(11, 22, 33, 44);
      for (int i = 0; i < kModeCount; ++i) {
          sk_sp<SkImageFilter> xfermode(SkXfermodeImageFilter::Make(static_cast<SkBlendMode>(i),
                                                                    background, foreground, nullptr));
          auto bounds = xfermode->filterBounds(src, SkMatrix::I(),
                                               SkImageFilter::kForward_MapDirection, nullptr);
          REPORTER_ASSERT(reporter, bounds == expectedBounds[i]);
      }
  
      // Test empty intersection.
      sk_sp<SkImageFilter> background2(new FixedBoundsImageFilter(SkIRect::MakeXYWH(0, 0, 20, 20)));
      sk_sp<SkImageFilter> foreground2(new FixedBoundsImageFilter(SkIRect::MakeXYWH(40, 40, 50, 50)));
      sk_sp<SkImageFilter> xfermode(SkXfermodeImageFilter::Make(
              SkBlendMode::kSrcIn, std::move(background2), std::move(foreground2), nullptr));
      auto bounds = xfermode->filterBounds(src, SkMatrix::I(),
                                           SkImageFilter::kForward_MapDirection, nullptr);
      REPORTER_ASSERT(reporter, bounds.isEmpty());
  }
  
  DEF_TEST(OffsetImageFilterBounds, reporter) {
      SkIRect src = SkIRect::MakeXYWH(0, 0, 100, 100);
      sk_sp<SkImageFilter> offset(SkOffsetImageFilter::Make(-50.5f, -50.5f, nullptr));
  
      SkIRect expectedForward = SkIRect::MakeXYWH(-50, -50, 100, 100);
      SkIRect boundsForward = offset->filterBounds(src, SkMatrix::I(),
                                                   SkImageFilter::kForward_MapDirection, nullptr);
      REPORTER_ASSERT(reporter, boundsForward == expectedForward);
  
      SkIRect expectedReverse = SkIRect::MakeXYWH(50, 50, 100, 100);
      SkIRect boundsReverse = offset->filterBounds(src, SkMatrix::I(),
                                                   SkImageFilter::kReverse_MapDirection, &src);
      REPORTER_ASSERT(reporter, boundsReverse == expectedReverse);
  }
  
  static void test_arithmetic_bounds(skiatest::Reporter* reporter, float k1, float k2, float k3,
                                     float k4, sk_sp<SkImageFilter> background,
                                     sk_sp<SkImageFilter> foreground,
                                     const SkImageFilter::CropRect* crop, const SkIRect& expected) {
      sk_sp<SkImageFilter> arithmetic(
              SkArithmeticImageFilter::Make(k1, k2, k3, k4, false, background, foreground, crop));
      // The value of the input rect doesn't matter because we use inputs with fixed bounds.
      SkIRect bounds = arithmetic->filterBounds(SkIRect::MakeXYWH(11, 22, 33, 44), SkMatrix::I(),
                                                SkImageFilter::kForward_MapDirection, nullptr);
      REPORTER_ASSERT(reporter, expected == bounds);
  }
  
  static void test_arithmetic_combinations(skiatest::Reporter* reporter, float v) {
      SkIRect background_rect = SkIRect::MakeXYWH(0, 0, 100, 100);
      SkIRect foreground_rect = SkIRect::MakeXYWH(50, 50, 100, 100);
      sk_sp<SkImageFilter> background(new FixedBoundsImageFilter(background_rect));
      sk_sp<SkImageFilter> foreground(new FixedBoundsImageFilter(foreground_rect));
  
      SkIRect union_rect = background_rect;
      union_rect.join(foreground_rect);
      SkIRect intersection = background_rect;
      intersection.intersect(foreground_rect);
  
      test_arithmetic_bounds(reporter, 0, 0, 0, 0, background, foreground, nullptr,
                             SkIRect::MakeEmpty());
      test_arithmetic_bounds(reporter, 0, 0, 0, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, 0, 0, v, 0, background, foreground, nullptr, background_rect);
      test_arithmetic_bounds(reporter, 0, 0, v, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, 0, v, 0, 0, background, foreground, nullptr, foreground_rect);
      test_arithmetic_bounds(reporter, 0, v, 0, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, 0, v, v, 0, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, 0, v, v, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, v, 0, 0, 0, background, foreground, nullptr, intersection);
      test_arithmetic_bounds(reporter, v, 0, 0, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, v, 0, v, 0, background, foreground, nullptr, background_rect);
      test_arithmetic_bounds(reporter, v, 0, v, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, v, v, 0, 0, background, foreground, nullptr, foreground_rect);
      test_arithmetic_bounds(reporter, v, v, 0, v, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, v, v, v, 0, background, foreground, nullptr, union_rect);
      test_arithmetic_bounds(reporter, v, v, v, v, background, foreground, nullptr, union_rect);
  
      // Test with crop. When k4 is non-zero, the result is expected to be crop_rect
      // regardless of inputs because the filter affects the whole crop area.
      SkIRect crop_rect = SkIRect::MakeXYWH(-111, -222, 333, 444);
      SkImageFilter::CropRect crop(SkRect::Make(crop_rect));
      test_arithmetic_bounds(reporter, 0, 0, 0, 0, background, foreground, &crop,
                             SkIRect::MakeEmpty());
      test_arithmetic_bounds(reporter, 0, 0, 0, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, 0, 0, v, 0, background, foreground, &crop, background_rect);
      test_arithmetic_bounds(reporter, 0, 0, v, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, 0, v, 0, 0, background, foreground, &crop, foreground_rect);
      test_arithmetic_bounds(reporter, 0, v, 0, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, 0, v, v, 0, background, foreground, &crop, union_rect);
      test_arithmetic_bounds(reporter, 0, v, v, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, v, 0, 0, 0, background, foreground, &crop, intersection);
      test_arithmetic_bounds(reporter, v, 0, 0, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, v, 0, v, 0, background, foreground, &crop, background_rect);
      test_arithmetic_bounds(reporter, v, 0, v, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, v, v, 0, 0, background, foreground, &crop, foreground_rect);
      test_arithmetic_bounds(reporter, v, v, 0, v, background, foreground, &crop, crop_rect);
      test_arithmetic_bounds(reporter, v, v, v, 0, background, foreground, &crop, union_rect);
      test_arithmetic_bounds(reporter, v, v, v, v, background, foreground, &crop, crop_rect);
  }
  
  // Test SkArithmeticImageFilter::filterBounds with different blending modes.
  DEF_TEST(ArithmeticImageFilterBounds, reporter) {
      test_arithmetic_combinations(reporter, 1);
      test_arithmetic_combinations(reporter, 0.5);
  }
  
  // Test SkImageSource::filterBounds.
  DEF_TEST(ImageSourceBounds, reporter) {
      sk_sp<SkImage> image(SkImage::MakeFromBitmap(make_gradient_circle(64, 64)));
      // Default src and dst rects.
      sk_sp<SkImageFilter> source1(SkImageSource::Make(image));
      SkIRect imageBounds = SkIRect::MakeWH(64, 64);
      SkIRect input(SkIRect::MakeXYWH(10, 20, 30, 40));
      REPORTER_ASSERT(reporter,
                      imageBounds == source1->filterBounds(input, SkMatrix::I(),
                                                           SkImageFilter::kForward_MapDirection,
                                                           nullptr));
      REPORTER_ASSERT(reporter,
                      input == source1->filterBounds(input, SkMatrix::I(),
                                                     SkImageFilter::kReverse_MapDirection, &input));
      SkMatrix scale(SkMatrix::MakeScale(2));
      SkIRect scaledBounds = SkIRect::MakeWH(128, 128);
      REPORTER_ASSERT(reporter,
                      scaledBounds == source1->filterBounds(input, scale,
                                                            SkImageFilter::kForward_MapDirection,
                                                            nullptr));
      REPORTER_ASSERT(reporter, input == source1->filterBounds(input, scale,
                                                               SkImageFilter::kReverse_MapDirection,
                                                               &input));
  
      // Specified src and dst rects.
      SkRect src(SkRect::MakeXYWH(0.5, 0.5, 100.5, 100.5));
      SkRect dst(SkRect::MakeXYWH(-10.5, -10.5, 120.5, 120.5));
      sk_sp<SkImageFilter> source2(SkImageSource::Make(image, src, dst, kMedium_SkFilterQuality));
      REPORTER_ASSERT(reporter,
                      dst.roundOut() == source2->filterBounds(input, SkMatrix::I(),
                                                              SkImageFilter::kForward_MapDirection,
                                                              nullptr));
      REPORTER_ASSERT(reporter,
                      input == source2->filterBounds(input, SkMatrix::I(),
                                                     SkImageFilter::kReverse_MapDirection, &input));
      scale.mapRect(&dst);
      scale.mapRect(&src);
      REPORTER_ASSERT(reporter,
                      dst.roundOut() == source2->filterBounds(input, scale,
                                                              SkImageFilter::kForward_MapDirection,
                                                              nullptr));
      REPORTER_ASSERT(reporter, input == source2->filterBounds(input, scale,
                                                               SkImageFilter::kReverse_MapDirection,
                                                               &input));
  }
  
  