1 /* 2 * Copyright 2017 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 "sk_tool_utils.h" 10 #include "SkCanvas.h" 11 #include "SkFont.h" 12 #include "SkGradientShader.h" 13 #include "SkHighContrastFilter.h" 14 15 using InvertStyle = SkHighContrastConfig::InvertStyle; 16 17 static SkScalar kSize = 200; 18 static SkColor kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0); 19 static SkColor kColor2 = SkColorSetARGB(0xff, 0x82, 0xff, 0); 20 21 static void draw_label(SkCanvas* canvas, const SkHighContrastConfig& config) { 22 char labelBuffer[256]; 23 const char* invertStr = 24 (config.fInvertStyle == InvertStyle::kInvertBrightness ? 25 "InvBrightness" : 26 (config.fInvertStyle == InvertStyle::kInvertLightness ? 27 "InvLightness" : "NoInvert")); 28 29 snprintf(labelBuffer, sizeof(labelBuffer), "%s%s contrast=%.1f", 30 config.fGrayscale ? "Gray " : "", 31 invertStr, 32 config.fContrast); 33 34 SkFont font; 35 font.setTypeface(sk_tool_utils::create_portable_typeface()); 36 font.setSize(0.05f); 37 font.setEdging(SkFont::Edging::kAlias); 38 39 size_t len = strlen(labelBuffer); 40 41 SkScalar width = font.measureText(labelBuffer, len, kUTF8_SkTextEncoding); 42 canvas->drawSimpleText(labelBuffer, len, kUTF8_SkTextEncoding, 0.5f - width / 2, 0.16f, font, SkPaint()); 43 } 44 45 static void draw_scene(SkCanvas* canvas, const SkHighContrastConfig& config) { 46 SkRect bounds = SkRect::MakeLTRB(0.0f, 0.0f, 1.0f, 1.0f); 47 SkPaint xferPaint; 48 xferPaint.setColorFilter(SkHighContrastFilter::Make(config)); 49 canvas->saveLayer(&bounds, &xferPaint); 50 51 SkPaint paint; 52 bounds = SkRect::MakeLTRB(0.1f, 0.2f, 0.9f, 0.4f); 53 paint.setARGB(0xff, 0x66, 0x11, 0x11); 54 canvas->drawRect(bounds, paint); 55 56 SkFont font; 57 font.setSize(0.15f); 58 font.setEdging(SkFont::Edging::kAlias); 59 60 paint.setARGB(0xff, 0xbb, 0x77, 0x77); 61 canvas->drawString("A", 0.15f, 0.35f, font, paint); 62 63 bounds = SkRect::MakeLTRB(0.1f, 0.8f, 0.9f, 1.0f); 64 paint.setARGB(0xff, 0xcc, 0xcc, 0xff); 65 canvas->drawRect(bounds, paint); 66 67 paint.setARGB(0xff, 0x88, 0x88, 0xbb); 68 canvas->drawString("Z", 0.75f, 0.95f, font, paint); 69 70 bounds = SkRect::MakeLTRB(0.1f, 0.4f, 0.9f, 0.6f); 71 SkPoint pts[] = { { 0, 0 }, { 1, 0 } }; 72 SkColor colors[] = { SK_ColorWHITE, SK_ColorBLACK }; 73 SkScalar pos[] = { 0.2f, 0.8f }; 74 paint.setShader(SkGradientShader::MakeLinear( 75 pts, colors, pos, 76 SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode)); 77 canvas->drawRect(bounds, paint); 78 79 bounds = SkRect::MakeLTRB(0.1f, 0.6f, 0.9f, 0.8f); 80 SkColor colors2[] = { SK_ColorGREEN, SK_ColorWHITE }; 81 paint.setShader(SkGradientShader::MakeLinear( 82 pts, colors2, pos, 83 SK_ARRAY_COUNT(colors2), SkShader::kClamp_TileMode)); 84 canvas->drawRect(bounds, paint); 85 86 canvas->restore(); 87 } 88 89 class HighContrastFilterGM : public skiagm::GM { 90 public: 91 HighContrastFilterGM() { 92 SkColor g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) }; 93 SkColor g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) }; 94 SkPoint g1Points[] = { { 0, 0 }, { 0, 100 } }; 95 SkPoint g2Points[] = { { 0, 0 }, { kSize, 0 } }; 96 SkScalar pos[] = { 0.2f, 1.0f }; 97 98 SkHighContrastConfig fConfig; 99 fFilter = SkHighContrastFilter::Make(fConfig); 100 fGr1 = SkGradientShader::MakeLinear( 101 g1Points, g1Colors, pos, SK_ARRAY_COUNT(g1Colors), 102 SkShader::kClamp_TileMode); 103 fGr2 = SkGradientShader::MakeLinear( 104 g2Points, g2Colors, pos, SK_ARRAY_COUNT(g2Colors), 105 SkShader::kClamp_TileMode); 106 } 107 108 protected: 109 110 SkString onShortName() override { 111 return SkString("highcontrastfilter"); 112 } 113 114 SkISize onISize() override { 115 return SkISize::Make(600, 420); 116 } 117 118 void onDraw(SkCanvas* canvas) override { 119 SkHighContrastConfig configs[] = { 120 { false, InvertStyle::kNoInvert, 0.0f }, 121 { false, InvertStyle::kInvertBrightness, 0.0f }, 122 { false, InvertStyle::kInvertLightness, 0.0f }, 123 { false, InvertStyle::kInvertLightness, 0.2f }, 124 { true, InvertStyle::kNoInvert, 0.0f }, 125 { true, InvertStyle::kInvertBrightness, 0.0f }, 126 { true, InvertStyle::kInvertLightness, 0.0f }, 127 { true, InvertStyle::kInvertLightness, 0.2f }, 128 }; 129 130 for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) { 131 SkScalar x = kSize * (i % 4); 132 SkScalar y = kSize * (i / 4); 133 canvas->save(); 134 canvas->translate(x, y); 135 canvas->scale(kSize, kSize); 136 draw_scene(canvas, configs[i]); 137 draw_label(canvas, configs[i]); 138 canvas->restore(); 139 } 140 } 141 142 private: 143 sk_sp<SkColorFilter> fFilter; 144 sk_sp<SkShader> fGr1, fGr2; 145 146 typedef skiagm::GM INHERITED; 147 }; 148 149 DEF_GM(return new HighContrastFilterGM;) 150
