/* * 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 "gm/gm.h" #include "include/core/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkMatrix.h" #include "include/core/SkPaint.h" #include "include/core/SkRect.h" #include "include/core/SkRefCnt.h" #include "include/core/SkScalar.h" #include "include/core/SkShader.h" #include "include/core/SkSize.h" #include "include/core/SkString.h" #include "include/effects/SkColorMatrix.h" #include "include/effects/SkImageFilters.h" #include "include/effects/SkPerlinNoiseShader.h" #include namespace { enum class Type { kFractalNoise, kTurbulence, }; sk_sp noise_shader(Type type, float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed, bool stitchTiles, SkISize size) { return (type == Type::kFractalNoise) ? SkShaders::MakeFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves, seed, stitchTiles ? &size : nullptr) : SkShaders::MakeTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed, stitchTiles ? &size : nullptr); } class PerlinNoiseGM : public skiagm::GM { SkISize fSize = {80, 80}; void onOnceBeforeDraw() override { this->setBGColor(0xFF000000); } SkString onShortName() override { return SkString("perlinnoise"); } SkISize onISize() override { return {200, 500}; } void drawRect(SkCanvas* canvas, int x, int y, const SkPaint& paint, const SkISize& size) { canvas->save(); canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); SkRect r = SkRect::MakeWH(SkIntToScalar(size.width()), SkIntToScalar(size.height())); canvas->drawRect(r, paint); canvas->restore(); } void test(SkCanvas* canvas, int x, int y, Type type, float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed, bool stitchTiles) { SkISize tileSize = SkISize::Make(fSize.width() / 2, fSize.height() / 2); sk_sp shader = noise_shader(type, baseFrequencyX, baseFrequencyY, numOctaves, seed, stitchTiles, tileSize); SkPaint paint; paint.setShader(std::move(shader)); if (stitchTiles) { drawRect(canvas, x, y, paint, tileSize); x += tileSize.width(); drawRect(canvas, x, y, paint, tileSize); y += tileSize.width(); drawRect(canvas, x, y, paint, tileSize); x -= tileSize.width(); drawRect(canvas, x, y, paint, tileSize); } else { drawRect(canvas, x, y, paint, fSize); } } void onDraw(SkCanvas* canvas) override { canvas->clear(SK_ColorBLACK); test(canvas, 0, 0, Type::kFractalNoise, 0.1f, 0.1f, 0, 0, false); test(canvas, 100, 0, Type::kTurbulence, 0.1f, 0.1f, 0, 0, false); test(canvas, 0, 100, Type::kFractalNoise, 0.1f, 0.1f, 2, 0, false); test(canvas, 100, 100, Type::kFractalNoise, 0.05f, 0.1f, 1, 0, true); test(canvas, 0, 200, Type::kTurbulence, 0.1f, 0.1f, 1, 0, true); test(canvas, 100, 200, Type::kTurbulence, 0.2f, 0.4f, 5, 0, false); test(canvas, 0, 300, Type::kFractalNoise, 0.1f, 0.1f, 3, 1, false); test(canvas, 100, 300, Type::kFractalNoise, 0.1f, 0.1f, 3, 4, false); canvas->scale(0.75f, 1.0f); test(canvas, 0, 400, Type::kFractalNoise, 0.1f, 0.1f, 2, 0, false); test(canvas, 100, 400, Type::kFractalNoise, 0.1f, 0.05f, 1, 0, true); } private: using INHERITED = GM; }; class PerlinNoiseLocalMatrixGM : public skiagm::GM { SkISize fSize = {80, 80}; SkString onShortName() override { return SkString("perlinnoise_localmatrix"); } SkISize onISize() override { return {640, 480}; } void onDraw(SkCanvas* canvas) override { canvas->translate(10, 10); SkPaint paint; paint.setShader(noise_shader(Type::kFractalNoise, 0.1f, 0.1f, 2, 0, false, fSize)); const SkScalar w = SkIntToScalar(fSize.width()); const SkScalar h = SkIntToScalar(fSize.height()); SkRect r = SkRect::MakeWH(w, h); canvas->drawRect(r, paint); canvas->save(); canvas->translate(w * 5/4, 0); canvas->drawRect(r, paint); canvas->restore(); canvas->save(); canvas->translate(0, h + 10); canvas->scale(2, 2); canvas->drawRect(r, paint); canvas->restore(); canvas->save(); canvas->translate(w + 100, h + 10); canvas->scale(2, 2); canvas->drawRect(r, paint); canvas->restore(); // The next row should draw the same as the previous, even though we are using a local // matrix instead of the canvas. canvas->translate(0, h * 2 + 10); SkMatrix lm; lm.setScale(2, 2); paint.setShader(paint.getShader()->makeWithLocalMatrix(lm)); r.fRight += r.width(); r.fBottom += r.height(); canvas->save(); canvas->translate(0, h + 10); canvas->drawRect(r, paint); canvas->restore(); canvas->save(); canvas->translate(w + 100, h + 10); canvas->drawRect(r, paint); canvas->restore(); } }; // Demonstrate skbug.com/14166 (Perlin noise shader doesn't rotate correctly) class PerlinNoiseRotatedGM : public skiagm::GM { static constexpr SkISize kCellSize = { 100, 100 }; static constexpr SkISize kRectSize = { 60, 60 }; static constexpr int kPad = 10; static constexpr int kCellsX = 3; static constexpr int kCellsY = 2; SkString onShortName() override { return SkString("perlinnoise_rotated"); } SkISize onISize() override { return { 2*kPad + kCellsX*kCellSize.width(), 2*kPad + kCellsY*kCellSize.height() }; } void onDraw(SkCanvas* canvas) override { SkPaint outline; outline.setColor(SK_ColorBLACK); outline.setStrokeWidth(2.0f); outline.setStyle(SkPaint::kStroke_Style); outline.setAntiAlias(true); const SkRect kRectToDraw = SkRect::MakeWH(kRectSize.width(), kRectSize.height()); const SkRect kMarker = SkRect::MakeWH(5, 5); float yOffset = kPad; for (auto type : { Type::kFractalNoise, Type::kTurbulence }) { float xOffset = kPad; SkPaint p; p.setShader(noise_shader(type, 0.05f, 0.05f, 1, 0, false, kRectSize)); for (float rotation : {0.0f, 10.0f, 80.0f}) { int saveCount = canvas->save(); canvas->translate(xOffset, yOffset); canvas->drawRect(SkRect::MakeWH(kCellSize.fWidth, kCellSize.fHeight), outline); canvas->save(); canvas->translate(kCellSize.fWidth / 2.0f, kCellSize.fHeight / 2.0f); canvas->rotate(rotation); canvas->translate(-kRectSize.fWidth/2.0f, -kRectSize.fHeight/2.0f); canvas->drawRect(kRectToDraw, p); canvas->drawRect(kRectToDraw, outline); canvas->drawRect(kMarker, outline); canvas->restoreToCount(saveCount); xOffset += kCellSize.width(); } yOffset += kCellSize.height(); } } }; // Demonstrate skbug.com/14411 (Intel GPUs show artifacts when applying perlin noise to layers) class PerlinNoiseLayeredGM : public skiagm::GM { SkString onShortName() override { return SkString("perlinnoise_layered"); } SkISize onISize() override { return {500, 500}; } void onDraw(SkCanvas* canvas) override { const sk_sp perlin = SkImageFilters::ColorFilter( SkColorFilters::Matrix(SkColorMatrix()), SkImageFilters::Shader(SkShaders::MakeFractalNoise(0.3f, 0.3f, 1, 4))); const SkPaint paint; canvas->saveLayer(nullptr, &paint); { SkPaint p; p.setImageFilter(perlin); canvas->drawPaint(p); } canvas->restore(); canvas->saveLayer(nullptr, nullptr); { SkPaint p; p.setImageFilter(perlin); canvas->drawPaint(p); } canvas->restore(); } }; } // anonymous namespace DEF_GM(return new PerlinNoiseGM;) DEF_GM(return new PerlinNoiseLocalMatrixGM;) DEF_GM(return new PerlinNoiseRotatedGM;) DEF_GM(return new PerlinNoiseLayeredGM;)