1 /* 2 * Copyright 2015 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 9 /* 10 * Tests text rendering with LCD and the various blend modes. 11 */ 12 13 #include "gm.h" 14 #include "sk_tool_utils.h" 15 #include "SkCanvas.h" 16 #include "SkGradientShader.h" 17 #include "SkSurface.h" 18 19 namespace skiagm { 20 21 constexpr int kColWidth = 180; 22 constexpr int kNumCols = 4; 23 constexpr int kWidth = kColWidth * kNumCols; 24 constexpr int kHeight = 750; 25 26 static sk_sp<SkShader> make_shader(const SkRect& bounds) { 27 const SkPoint pts[] = { 28 { bounds.left(), bounds.top() }, 29 { bounds.right(), bounds.bottom() }, 30 }; 31 const SkColor colors[] = { 32 SK_ColorRED, SK_ColorGREEN, 33 }; 34 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors), 35 SkShader::kRepeat_TileMode); 36 } 37 38 class LcdBlendGM : public skiagm::GM { 39 public: 40 LcdBlendGM() { 41 const int kPointSize = 25; 42 fTextHeight = SkIntToScalar(kPointSize); 43 } 44 45 protected: 46 SkString onShortName() override { 47 return SkString("lcdblendmodes"); 48 } 49 50 void onOnceBeforeDraw() override { 51 fCheckerboard = sk_tool_utils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 4); 52 } 53 54 SkISize onISize() override { return SkISize::Make(kWidth, kHeight); } 55 56 void onDraw(SkCanvas* canvas) override { 57 SkPaint p; 58 p.setAntiAlias(false); 59 p.setStyle(SkPaint::kFill_Style); 60 p.setShader(fCheckerboard); 61 SkRect r = SkRect::MakeWH(SkIntToScalar(kWidth), SkIntToScalar(kHeight)); 62 canvas->drawRect(r, p); 63 64 SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight); 65 auto surface(canvas->makeSurface(info)); 66 if (nullptr == surface) { 67 surface = SkSurface::MakeRaster(info); 68 } 69 70 SkCanvas* surfCanvas = surface->getCanvas(); 71 this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false); 72 surfCanvas->translate(SkIntToScalar(kColWidth), 0); 73 this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false); 74 surfCanvas->translate(SkIntToScalar(kColWidth), 0); 75 this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false); 76 surfCanvas->translate(SkIntToScalar(kColWidth), 0); 77 this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true); 78 79 SkPaint surfPaint; 80 surfPaint.setBlendMode(SkBlendMode::kSrcOver); 81 surface->draw(canvas, 0, 0, &surfPaint); 82 } 83 84 void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) { 85 const SkBlendMode gModes[] = { 86 SkBlendMode::kClear, 87 SkBlendMode::kSrc, 88 SkBlendMode::kDst, 89 SkBlendMode::kSrcOver, 90 SkBlendMode::kDstOver, 91 SkBlendMode::kSrcIn, 92 SkBlendMode::kDstIn, 93 SkBlendMode::kSrcOut, 94 SkBlendMode::kDstOut, 95 SkBlendMode::kSrcATop, 96 SkBlendMode::kDstATop, 97 SkBlendMode::kXor, 98 SkBlendMode::kPlus, 99 SkBlendMode::kModulate, 100 SkBlendMode::kScreen, 101 SkBlendMode::kOverlay, 102 SkBlendMode::kDarken, 103 SkBlendMode::kLighten, 104 SkBlendMode::kColorDodge, 105 SkBlendMode::kColorBurn, 106 SkBlendMode::kHardLight, 107 SkBlendMode::kSoftLight, 108 SkBlendMode::kDifference, 109 SkBlendMode::kExclusion, 110 SkBlendMode::kMultiply, 111 SkBlendMode::kHue, 112 SkBlendMode::kSaturation, 113 SkBlendMode::kColor, 114 SkBlendMode::kLuminosity, 115 }; 116 // Draw background rect 117 SkPaint backgroundPaint; 118 backgroundPaint.setColor(backgroundColor); 119 canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint); 120 SkScalar y = fTextHeight; 121 for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) { 122 SkPaint paint; 123 paint.setColor(textColor); 124 paint.setAntiAlias(true); 125 paint.setSubpixelText(true); 126 paint.setLCDRenderText(true); 127 paint.setTextSize(fTextHeight); 128 paint.setBlendMode(gModes[m]); 129 sk_tool_utils::set_portable_typeface(&paint); 130 if (useGrad) { 131 SkRect r; 132 r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight); 133 paint.setShader(make_shader(r)); 134 } 135 SkString string(SkBlendMode_Name(gModes[m])); 136 canvas->drawText(string.c_str(), string.size(), 0, y, paint); 137 y+=fTextHeight; 138 } 139 } 140 141 private: 142 SkScalar fTextHeight; 143 sk_sp<SkShader> fCheckerboard; 144 typedef skiagm::GM INHERITED; 145 }; 146 147 ////////////////////////////////////////////////////////////////////////////// 148 149 DEF_GM( return new LcdBlendGM; ) 150 } 151