/* * 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 SkImage* make_image(SkCanvas* rootCanvas) { SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100); SkAutoTUnref<SkSurface> surface(rootCanvas->newSurface(info)); if (!surface) { surface.reset(SkSurface::NewRaster(info)); } SkPaint paint; paint.setAntiAlias(true); paint.setColor(SK_ColorRED); surface->getCanvas()->drawCircle(50, 50, 50, paint); return surface->newImageSnapshot(); } 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, 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 { SkAutoTUnref<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) { SkAutoTUnref<SkImageFilter> filter(factory()); canvas->save(); show_image(canvas, image0, filter); for (const auto& matrix : matrices) { SkAutoTUnref<SkImageFilter> localFilter(filter->newWithLocalMatrix(matrix)); canvas->translate(spacer, 0); show_image(canvas, image0, localFilter); } canvas->restore(); canvas->translate(0, spacer); } } private: typedef GM INHERITED; }; DEF_GM( return new LocalMatrixImageFilterGM; )