1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkImageInfo.h" 12 #include "include/core/SkMatrix.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkPoint.h" 15 #include "include/core/SkRRect.h" 16 #include "include/core/SkRect.h" 17 #include "include/core/SkScalar.h" 18 #include "include/core/SkSize.h" 19 #include "include/core/SkString.h" 20 #include "include/core/SkTypes.h" 21 #include "include/private/base/SkTArray.h" 22 #include "src/base/SkRandom.h" 23 24 using namespace skia_private; 25 26 namespace skiagm { 27 28 /* 29 * This is the base class for two GMs that cover various corner cases with primitive Skia shapes 30 * (zero radius, near-zero radius, inner shape overlap, etc.) It uses an xfermode of darken to help 31 * double-blended and/or dropped pixels stand out. 32 */ 33 class ShapesGM : public GM { 34 protected: ShapesGM(const char * name,bool antialias)35 ShapesGM(const char* name, bool antialias) : fName(name), fAntialias(antialias) { 36 if (!antialias) { 37 fName.append("_bw"); 38 } 39 } 40 getName() const41 SkString getName() const override { return fName; } getISize()42 SkISize getISize() override { return SkISize::Make(500, 500); } 43 onOnceBeforeDraw()44 void onOnceBeforeDraw() override { 45 fShapes.push_back().setOval(SkRect::MakeXYWH(-5, 25, 200, 100)); 46 fRotations.push_back(21); 47 48 fShapes.push_back().setRect(SkRect::MakeXYWH(95, 75, 125, 100)); 49 fRotations.push_back(94); 50 51 fShapes.push_back().setRectXY(SkRect::MakeXYWH(0, 75, 150, 100), 1e-5f, 1e-5f); 52 fRotations.push_back(132); 53 54 fShapes.push_back().setRectXY(SkRect::MakeXYWH(15, -20, 100, 100), 20, 15); 55 fRotations.push_back(282); 56 57 fSimpleShapeCount = fShapes.size(); 58 59 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(140, -50, 90, 110), 10, 5, 25, 35); 60 fRotations.push_back(0); 61 62 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(160, -60, 60, 90), 10, 60, 50, 30); 63 fRotations.push_back(-35); 64 65 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(220, -120, 60, 90), 1, 89, 59, 1); 66 fRotations.push_back(65); 67 68 SkVector radii[4] = {{4, 6}, {12, 8}, {24, 16}, {32, 48}}; 69 fShapes.push_back().setRectRadii(SkRect::MakeXYWH(150, -129, 80, 160), radii); 70 fRotations.push_back(265); 71 72 SkVector radii2[4] = {{0, 0}, {80, 60}, {0, 0}, {80, 60}}; 73 fShapes.push_back().setRectRadii(SkRect::MakeXYWH(180, -30, 80, 60), radii2); 74 fRotations.push_back(295); 75 76 fPaint.setAntiAlias(fAntialias); 77 } 78 onDraw(SkCanvas * canvas)79 void onDraw(SkCanvas* canvas) override { 80 canvas->clear(SK_ColorWHITE); 81 82 canvas->save(); 83 canvas->translate(canvas->imageInfo().width() / 2.f, canvas->imageInfo().height() / 2.f); 84 this->drawShapes(canvas); 85 canvas->restore(); 86 } 87 88 virtual void drawShapes(SkCanvas* canvas) const = 0; 89 90 protected: 91 SkString fName; 92 bool fAntialias; 93 SkPaint fPaint; 94 TArray<SkRRect> fShapes; 95 TArray<SkScalar> fRotations; 96 int fSimpleShapeCount; 97 98 private: 99 using INHERITED = GM; 100 }; 101 102 class SimpleShapesGM : public ShapesGM { 103 public: SimpleShapesGM(bool antialias)104 SimpleShapesGM(bool antialias) : INHERITED("simpleshapes", antialias) {} 105 106 private: drawShapes(SkCanvas * canvas) const107 void drawShapes(SkCanvas* canvas) const override { 108 SkRandom rand(2); 109 for (int i = 0; i < fShapes.size(); i++) { 110 SkPaint paint(fPaint); 111 paint.setColor(rand.nextU() & ~0x808080); 112 paint.setAlphaf(0.5f); // Use alpha to detect double blends. 113 const SkRRect& shape = fShapes[i]; 114 canvas->save(); 115 canvas->rotate(fRotations[i]); 116 switch (shape.getType()) { 117 case SkRRect::kRect_Type: 118 canvas->drawRect(shape.rect(), paint); 119 break; 120 case SkRRect::kOval_Type: 121 canvas->drawOval(shape.rect(), paint); 122 break; 123 default: 124 canvas->drawRRect(shape, paint); 125 break; 126 } 127 canvas->restore(); 128 } 129 } 130 131 using INHERITED = ShapesGM; 132 }; 133 134 class InnerShapesGM : public ShapesGM { 135 public: InnerShapesGM(bool antialias)136 InnerShapesGM(bool antialias) : INHERITED("innershapes", antialias) {} 137 138 private: drawShapes(SkCanvas * canvas) const139 void drawShapes(SkCanvas* canvas) const override { 140 SkRandom rand; 141 for (int i = 0; i < fShapes.size(); i++) { 142 const SkRRect& outer = fShapes[i]; 143 const SkRRect& inner = fShapes[(i * 7 + 11) % fSimpleShapeCount]; 144 float s = 0.95f * std::min(outer.rect().width() / inner.rect().width(), 145 outer.rect().height() / inner.rect().height()); 146 SkMatrix innerXform; 147 float dx = (rand.nextF() - 0.5f) * (outer.rect().width() - s * inner.rect().width()); 148 float dy = (rand.nextF() - 0.5f) * (outer.rect().height() - s * inner.rect().height()); 149 // Fixup inner rects so they don't reach outside the outer rect. 150 switch (i) { 151 case 0: 152 s *= .85f; 153 break; 154 case 8: 155 s *= .4f; 156 dx = dy = 0; 157 break; 158 case 5: 159 s *= .75f; 160 dx = dy = 0; 161 break; 162 case 6: 163 s *= .65f; 164 dx = -5; 165 dy = 10; 166 break; 167 } 168 innerXform.setTranslate(outer.rect().centerX() + dx, outer.rect().centerY() + dy); 169 if (s < 1) { 170 innerXform.preScale(s, s); 171 } 172 innerXform.preTranslate(-inner.rect().centerX(), -inner.rect().centerY()); 173 SkRRect xformedInner; 174 inner.transform(innerXform, &xformedInner); 175 SkPaint paint(fPaint); 176 paint.setColor(rand.nextU() & ~0x808080); 177 paint.setAlphaf(0.5f); // Use alpha to detect double blends. 178 canvas->save(); 179 canvas->rotate(fRotations[i]); 180 canvas->drawDRRect(outer, xformedInner, paint); 181 canvas->restore(); 182 } 183 } 184 185 using INHERITED = ShapesGM; 186 }; 187 188 ////////////////////////////////////////////////////////////////////////////// 189 190 DEF_GM( return new SimpleShapesGM(true); ) 191 DEF_GM( return new SimpleShapesGM(false); ) 192 DEF_GM( return new InnerShapesGM(true); ) 193 DEF_GM( return new InnerShapesGM(false); ) 194 195 } // namespace skiagm 196