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.h" 9 #include "SkBitmap.h" 10 #include "SkGradientShader.h" 11 #include "SkSurface.h" 12 #include "SkXfermode.h" 13 #include "SkColorPriv.h" 14 15 #if SK_SUPPORT_GPU 16 #include "GrContext.h" 17 #include "SkGpuDevice.h" 18 #endif 19 20 namespace skiagm { 21 22 /** 23 * This tests drawing device-covering rects with solid colors and bitmap shaders over a 24 * checkerboard background using different xfermodes. 25 */ 26 class Xfermodes3GM : public GM { 27 public: Xfermodes3GM()28 Xfermodes3GM() {} 29 30 protected: onShortName()31 SkString onShortName() override { 32 return SkString("xfermodes3"); 33 } 34 onISize()35 SkISize onISize() override { 36 return SkISize::Make(630, 1215); 37 } 38 onDrawBackground(SkCanvas * canvas)39 void onDrawBackground(SkCanvas* canvas) override { 40 SkPaint bgPaint; 41 bgPaint.setColor(sk_tool_utils::color_to_565(0xFF70D0E0)); 42 canvas->drawPaint(bgPaint); 43 } 44 onDraw(SkCanvas * canvas)45 void onDraw(SkCanvas* canvas) override { 46 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 47 48 SkPaint labelP; 49 labelP.setAntiAlias(true); 50 sk_tool_utils::set_portable_typeface(&labelP); 51 52 static const SkColor kSolidColors[] = { 53 SK_ColorTRANSPARENT, 54 SK_ColorBLUE, 55 0x80808000 56 }; 57 58 static const SkColor kBmpAlphas[] = { 59 0xff, 60 0x80, 61 }; 62 63 SkAutoTUnref<SkSurface> tempSurface(this->possiblyCreateTempSurface(canvas, kSize, kSize)); 64 65 int test = 0; 66 int x = 0, y = 0; 67 static const struct { SkPaint::Style fStyle; SkScalar fWidth; } kStrokes[] = { 68 {SkPaint::kFill_Style, 0}, 69 {SkPaint::kStroke_Style, SkIntToScalar(kSize) / 2}, 70 }; 71 for (size_t s = 0; s < SK_ARRAY_COUNT(kStrokes); ++s) { 72 for (size_t m = 0; m <= SkXfermode::kLastMode; ++m) { 73 SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m); 74 canvas->drawText(SkXfermode::ModeName(mode), 75 strlen(SkXfermode::ModeName(mode)), 76 SkIntToScalar(x), 77 SkIntToScalar(y + kSize + 3) + labelP.getTextSize(), 78 labelP); 79 for (size_t c = 0; c < SK_ARRAY_COUNT(kSolidColors); ++c) { 80 SkPaint modePaint; 81 modePaint.setXfermodeMode(mode); 82 modePaint.setColor(kSolidColors[c]); 83 modePaint.setStyle(kStrokes[s].fStyle); 84 modePaint.setStrokeWidth(kStrokes[s].fWidth); 85 86 this->drawMode(canvas, x, y, kSize, kSize, modePaint, tempSurface); 87 88 ++test; 89 x += kSize + 10; 90 if (!(test % kTestsPerRow)) { 91 x = 0; 92 y += kSize + 30; 93 } 94 } 95 for (size_t a = 0; a < SK_ARRAY_COUNT(kBmpAlphas); ++a) { 96 SkPaint modePaint; 97 modePaint.setXfermodeMode(mode); 98 modePaint.setAlpha(kBmpAlphas[a]); 99 modePaint.setShader(fBmpShader); 100 modePaint.setStyle(kStrokes[s].fStyle); 101 modePaint.setStrokeWidth(kStrokes[s].fWidth); 102 103 this->drawMode(canvas, x, y, kSize, kSize, modePaint, tempSurface); 104 105 ++test; 106 x += kSize + 10; 107 if (!(test % kTestsPerRow)) { 108 x = 0; 109 y += kSize + 30; 110 } 111 } 112 } 113 } 114 } 115 116 private: 117 /** 118 * GrContext has optimizations around full rendertarget draws that can be replaced with clears. 119 * We are trying to test those. We could use saveLayer() to create small SkGpuDevices but 120 * saveLayer() uses the texture cache. This means that the actual render target may be larger 121 * than the layer. Because the clip will contain the layer's bounds, no draws will be full-RT. 122 * So when running on a GPU canvas we explicitly create a temporary canvas using a texture with 123 * dimensions exactly matching the layer size. 124 */ possiblyCreateTempSurface(SkCanvas * baseCanvas,int w,int h)125 SkSurface* possiblyCreateTempSurface(SkCanvas* baseCanvas, int w, int h) { 126 #if SK_SUPPORT_GPU 127 GrContext* context = baseCanvas->getGrContext(); 128 SkImageInfo baseInfo = baseCanvas->imageInfo(); 129 SkImageInfo info = SkImageInfo::Make(w, h, baseInfo.colorType(), baseInfo.alphaType(), 130 baseInfo.profileType()); 131 return SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info, 0, nullptr); 132 #else 133 return nullptr; 134 #endif 135 } 136 drawMode(SkCanvas * canvas,int x,int y,int w,int h,const SkPaint & modePaint,SkSurface * surface)137 void drawMode(SkCanvas* canvas, 138 int x, int y, int w, int h, 139 const SkPaint& modePaint, SkSurface* surface) { 140 canvas->save(); 141 canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); 142 143 SkRect r = SkRect::MakeWH(SkIntToScalar(w), SkIntToScalar(h)); 144 145 SkCanvas* modeCanvas; 146 if (nullptr == surface) { 147 canvas->saveLayer(&r, nullptr); 148 modeCanvas = canvas; 149 } else { 150 modeCanvas = surface->getCanvas(); 151 } 152 153 SkPaint bgPaint; 154 bgPaint.setAntiAlias(false); 155 bgPaint.setShader(fBGShader); 156 modeCanvas->drawRect(r, bgPaint); 157 modeCanvas->drawRect(r, modePaint); 158 modeCanvas = nullptr; 159 160 if (nullptr == surface) { 161 canvas->restore(); 162 } else { 163 surface->draw(canvas, 0, 0, nullptr); 164 } 165 166 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 167 SkPaint borderPaint; 168 borderPaint.setStyle(SkPaint::kStroke_Style); 169 canvas->drawRect(r, borderPaint); 170 171 canvas->restore(); 172 } 173 onOnceBeforeDraw()174 void onOnceBeforeDraw() override { 175 static const uint32_t kCheckData[] = { 176 SkPackARGB32(0xFF, 0x42, 0x41, 0x42), 177 SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6), 178 SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6), 179 SkPackARGB32(0xFF, 0x42, 0x41, 0x42) 180 }; 181 SkBitmap bg; 182 bg.allocN32Pixels(2, 2, true); 183 SkAutoLockPixels bgAlp(bg); 184 memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData)); 185 186 SkMatrix lm; 187 lm.setScale(SkIntToScalar(kCheckSize), SkIntToScalar(kCheckSize)); 188 fBGShader.reset(SkShader::CreateBitmapShader(bg, 189 SkShader::kRepeat_TileMode, 190 SkShader::kRepeat_TileMode, 191 &lm)); 192 193 SkPaint bmpPaint; 194 static const SkPoint kCenter = { SkIntToScalar(kSize) / 2, SkIntToScalar(kSize) / 2 }; 195 static const SkColor kColors[] = { SK_ColorTRANSPARENT, 0x80800000, 196 0xF020F060, SK_ColorWHITE }; 197 bmpPaint.setShader(SkGradientShader::CreateRadial(kCenter, 198 3 * SkIntToScalar(kSize) / 4, 199 kColors, 200 nullptr, 201 SK_ARRAY_COUNT(kColors), 202 SkShader::kRepeat_TileMode))->unref(); 203 204 SkBitmap bmp; 205 bmp.allocN32Pixels(kSize, kSize); 206 SkCanvas bmpCanvas(bmp); 207 208 bmpCanvas.clear(SK_ColorTRANSPARENT); 209 SkRect rect = { SkIntToScalar(kSize) / 8, SkIntToScalar(kSize) / 8, 210 7 * SkIntToScalar(kSize) / 8, 7 * SkIntToScalar(kSize) / 8}; 211 bmpCanvas.drawRect(rect, bmpPaint); 212 213 fBmpShader.reset(SkShader::CreateBitmapShader(bmp, 214 SkShader::kClamp_TileMode, 215 SkShader::kClamp_TileMode)); 216 } 217 218 enum { 219 kCheckSize = 8, 220 kSize = 30, 221 kTestsPerRow = 15, 222 }; 223 224 SkAutoTUnref<SkShader> fBGShader; 225 SkAutoTUnref<SkShader> fBmpShader; 226 227 typedef GM INHERITED; 228 }; 229 230 ////////////////////////////////////////////////////////////////////////////// 231 232 DEF_GM(return new Xfermodes3GM;) 233 234 } 235