| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm.h" |
| #include "SkCanvas.h" |
| #include "SkBlurImageFilter.h" |
| #include "SkColorFilterImageFilter.h" |
| #include "SkModeColorFilter.h" |
| #include "SkMorphologyImageFilter.h" |
| #include "SkOffsetImageFilter.h" |
| #include "SkSurface.h" |
| |
| static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) { |
| SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); |
| auto surface(rootCanvas->makeSurface(info)); |
| if (!surface) { |
| surface = SkSurface::MakeRaster(info); |
| } |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setColor(SK_ColorRED); |
| surface->getCanvas()->drawCircle(50, 50, 50, paint); |
| return surface->makeImageSnapshot(); |
| } |
| |
| typedef SkImageFilter* (*ImageFilterFactory)(); |
| |
| // +[]{...} did not work on windows (VS) |
| // (ImageFilterFactory)[]{...} did not work on linux (gcc) |
| // hence this cast function |
| template <typename T> ImageFilterFactory IFCCast(T arg) { return arg; } |
| |
| // Show the effect of localmatriximagefilter with various matrices, on various filters |
| class LocalMatrixImageFilterGM : public skiagm::GM { |
| public: |
| LocalMatrixImageFilterGM() {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("localmatriximagefilter"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(640, 640); |
| } |
| |
| static void show_image(SkCanvas* canvas, SkImage* image, sk_sp<SkImageFilter> filter) { |
| SkPaint paint; |
| paint.setStyle(SkPaint::kStroke_Style); |
| SkRect r = SkRect::MakeIWH(image->width(), image->height()).makeOutset(SK_ScalarHalf, |
| SK_ScalarHalf); |
| canvas->drawRect(r, paint); |
| |
| paint.setStyle(SkPaint::kFill_Style); |
| paint.setImageFilter(filter); |
| canvas->drawImage(image, 0, 0, &paint); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| sk_sp<SkImage> image0(make_image(canvas)); |
| |
| const ImageFilterFactory factories[] = { |
| IFCCast([]{ return SkBlurImageFilter::Create(8, 8); }), |
| IFCCast([]{ return SkDilateImageFilter::Create(8, 8); }), |
| IFCCast([]{ return SkErodeImageFilter::Create(8, 8); }), |
| IFCCast([]{ return SkOffsetImageFilter::Create(8, 8); }), |
| }; |
| |
| const SkMatrix matrices[] = { |
| SkMatrix::MakeScale(SK_ScalarHalf, SK_ScalarHalf), |
| SkMatrix::MakeScale(2, 2), |
| SkMatrix::MakeTrans(10, 10) |
| }; |
| |
| const SkScalar spacer = image0->width() * 3.0f / 2; |
| |
| canvas->translate(40, 40); |
| for (auto&& factory : factories) { |
| sk_sp<SkImageFilter> filter(factory()); |
| |
| canvas->save(); |
| show_image(canvas, image0.get(), filter); |
| for (const auto& matrix : matrices) { |
| sk_sp<SkImageFilter> localFilter(filter->makeWithLocalMatrix(matrix)); |
| canvas->translate(spacer, 0); |
| show_image(canvas, image0.get(), std::move(localFilter)); |
| } |
| canvas->restore(); |
| canvas->translate(0, spacer); |
| } |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| DEF_GM( return new LocalMatrixImageFilterGM; ) |