1 /* 2 * Copyright 2013 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/SkBlendMode.h" 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkColor.h" 12 #include "include/core/SkColorSpace.h" 13 #include "include/core/SkFont.h" 14 #include "include/core/SkImageInfo.h" 15 #include "include/core/SkMatrix.h" 16 #include "include/core/SkPaint.h" 17 #include "include/core/SkPathBuilder.h" 18 #include "include/core/SkPoint.h" 19 #include "include/core/SkRect.h" 20 #include "include/core/SkRefCnt.h" 21 #include "include/core/SkScalar.h" 22 #include "include/core/SkSize.h" 23 #include "include/core/SkString.h" 24 #include "include/core/SkSurface.h" 25 #include "include/core/SkTypeface.h" 26 #include "include/core/SkTypes.h" 27 #include "src/base/SkRandom.h" 28 #include "tools/ToolUtils.h" 29 #include "tools/fonts/FontToolUtils.h" 30 31 namespace skiagm { 32 33 /** 34 * Renders overlapping shapes with colorburn against a checkerboard. 35 */ 36 class DstReadShuffle : public GM { 37 public: DstReadShuffle()38 DstReadShuffle() { this->setBGColor(kBackground); } 39 40 protected: 41 enum ShapeType { 42 kCircle_ShapeType, 43 kRoundRect_ShapeType, 44 kRect_ShapeType, 45 kConvexPath_ShapeType, 46 kConcavePath_ShapeType, 47 kText_ShapeType, 48 kNumShapeTypes 49 }; 50 getName() const51 SkString getName() const override { return SkString("dstreadshuffle"); } 52 getISize()53 SkISize getISize() override { return SkISize::Make(530, 680); } 54 drawShape(SkCanvas * canvas,SkPaint * paint,ShapeType type)55 void drawShape(SkCanvas* canvas, SkPaint* paint, ShapeType type) { 56 const SkRect kRect = SkRect::MakeXYWH(0, 0, 75.f, 85.f); 57 switch (type) { 58 case kCircle_ShapeType: 59 canvas->drawCircle(kRect.centerX(), kRect.centerY(), kRect.width() / 2.f, *paint); 60 break; 61 case kRoundRect_ShapeType: 62 canvas->drawRoundRect(kRect, 15.f, 15.f, *paint); 63 break; 64 case kRect_ShapeType: 65 canvas->drawRect(kRect, *paint); 66 break; 67 case kConvexPath_ShapeType: 68 if (fConvexPath.isEmpty()) { 69 SkPoint points[4]; 70 kRect.toQuad(points); 71 fConvexPath = SkPathBuilder().moveTo(points[0]) 72 .quadTo(points[1], points[2]) 73 .quadTo(points[3], points[0]) 74 .detach(); 75 SkASSERT(fConvexPath.isConvex()); 76 } 77 canvas->drawPath(fConvexPath, *paint); 78 break; 79 case kConcavePath_ShapeType: 80 if (fConcavePath.isEmpty()) { 81 SkPathBuilder b; 82 SkPoint points[5] = {{50.f, 0.f}}; 83 SkMatrix rot; 84 rot.setRotate(360.f / 5, 50.f, 70.f); 85 for (int i = 1; i < 5; ++i) { 86 rot.mapPoints(points + i, points + i - 1, 1); 87 } 88 b.moveTo(points[0]); 89 for (int i = 0; i < 5; ++i) { 90 b.lineTo(points[(2 * i) % 5]); 91 } 92 fConcavePath = b.setFillType(SkPathFillType::kEvenOdd) 93 .detach(); 94 SkASSERT(!fConcavePath.isConvex()); 95 } 96 canvas->drawPath(fConcavePath, *paint); 97 break; 98 case kText_ShapeType: { 99 const char* text = "N"; 100 SkFont font(ToolUtils::DefaultPortableTypeface(), 100); 101 font.setEmbolden(true); 102 canvas->drawString(text, 0.f, 100.f, font, *paint); 103 break; 104 } 105 default: 106 break; 107 } 108 } 109 GetColor(SkRandom * random)110 static SkColor GetColor(SkRandom* random) { 111 SkColor color = ToolUtils::color_to_565(random->nextU() | 0xFF000000); 112 return SkColorSetA(color, 0x80); 113 } 114 DrawHairlines(SkCanvas * canvas)115 static void DrawHairlines(SkCanvas* canvas) { 116 if (canvas->imageInfo().alphaType() == kOpaque_SkAlphaType) { 117 canvas->clear(kBackground); 118 } else { 119 canvas->clear(SK_ColorTRANSPARENT); 120 } 121 SkPaint hairPaint; 122 hairPaint.setStyle(SkPaint::kStroke_Style); 123 hairPaint.setStrokeWidth(0); 124 hairPaint.setAntiAlias(true); 125 static constexpr int kNumHairlines = 12; 126 SkPoint pts[] = {{3.f, 7.f}, {29.f, 7.f}}; 127 SkRandom colorRandom; 128 SkMatrix rot; 129 rot.setRotate(360.f / kNumHairlines, 15.5f, 12.f); 130 rot.postTranslate(3.f, 0); 131 for (int i = 0; i < 12; ++i) { 132 hairPaint.setColor(GetColor(&colorRandom)); 133 canvas->drawLine(pts[0], pts[1], hairPaint); 134 rot.mapPoints(pts, 2); 135 } 136 } 137 onDraw(SkCanvas * canvas)138 void onDraw(SkCanvas* canvas) override { 139 SkScalar y = 5; 140 for (int i = 0; i < kNumShapeTypes; i++) { 141 SkRandom colorRandom; 142 ShapeType shapeType = static_cast<ShapeType>(i); 143 SkScalar x = 5; 144 for (int r = 0; r <= 15; r++) { 145 SkPaint p; 146 p.setAntiAlias(true); 147 p.setColor(GetColor(&colorRandom)); 148 // In order to get some op combining on the GPU backend we do 2 src over 149 // for each xfer mode which requires a dst read 150 p.setBlendMode(r % 3 == 0 ? SkBlendMode::kColorBurn : SkBlendMode::kSrcOver); 151 canvas->save(); 152 canvas->translate(x, y); 153 this->drawShape(canvas, &p, shapeType); 154 canvas->restore(); 155 x += 15; 156 } 157 y += 110; 158 } 159 // Draw hairlines to a surface and then draw that to the main canvas with a zoom so that 160 // it is easier to see how they blend. 161 SkImageInfo info; 162 // Recording canvases don't have a color type. 163 if (SkColorType::kUnknown_SkColorType == canvas->imageInfo().colorType()) { 164 info = SkImageInfo::MakeN32Premul(35, 35); 165 } else { 166 info = SkImageInfo::Make(35, 35, 167 canvas->imageInfo().colorType(), 168 canvas->imageInfo().alphaType(), 169 canvas->imageInfo().refColorSpace()); 170 } 171 auto surf = canvas->makeSurface(info); 172 if (!surf) { 173 // Fall back to raster. Raster supports only one of the 8 bit per-channel RGBA or BGRA 174 // formats. This fall back happens when running with --preAbandonGpuContext. 175 if ((info.colorType() == kRGBA_8888_SkColorType || 176 info.colorType() == kBGRA_8888_SkColorType) && 177 info.colorType() != kN32_SkColorType) { 178 info = SkImageInfo::Make(35, 35, 179 kN32_SkColorType, 180 canvas->imageInfo().alphaType(), 181 canvas->imageInfo().refColorSpace()); 182 } 183 surf = SkSurfaces::Raster(info); 184 SkASSERT(surf); 185 } 186 canvas->scale(5.f, 5.f); 187 canvas->translate(67.f, 10.f); 188 DrawHairlines(surf->getCanvas()); 189 canvas->drawImage(surf->makeImageSnapshot(), 0.f, 0.f); 190 } 191 192 private: 193 static constexpr SkColor kBackground = SK_ColorLTGRAY; 194 SkPath fConcavePath; 195 SkPath fConvexPath; 196 using INHERITED = GM; 197 }; 198 199 ////////////////////////////////////////////////////////////////////////////// 200 201 DEF_GM( return new DstReadShuffle; ) 202 203 } // namespace skiagm 204