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 #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/SkFont.h"
13 #include "include/core/SkImageInfo.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkPoint.h"
16 #include "include/core/SkRect.h"
17 #include "include/core/SkRefCnt.h"
18 #include "include/core/SkScalar.h"
19 #include "include/core/SkShader.h"
20 #include "include/core/SkSize.h"
21 #include "include/core/SkString.h"
22 #include "include/core/SkSurface.h"
23 #include "include/core/SkTileMode.h"
24 #include "include/core/SkTypeface.h"
25 #include "include/core/SkTypes.h"
26 #include "include/effects/SkGradientShader.h"
27 #include "tools/ToolUtils.h"
28
29 namespace skiagm {
30
31 constexpr int kColWidth = 180;
32 constexpr int kNumCols = 4;
33 constexpr int kWidth = kColWidth * kNumCols;
34 constexpr int kHeight = 750;
35
make_shader(const SkRect & bounds)36 static sk_sp<SkShader> make_shader(const SkRect& bounds) {
37 const SkPoint pts[] = {
38 { bounds.left(), bounds.top() },
39 { bounds.right(), bounds.bottom() },
40 };
41 const SkColor colors[] = {
42 SK_ColorRED, SK_ColorGREEN,
43 };
44 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
45 SkTileMode::kRepeat);
46 }
47
48 class LcdBlendGM : public skiagm::GM {
49 public:
LcdBlendGM()50 LcdBlendGM() {
51 const int kPointSize = 25;
52 fTextHeight = SkIntToScalar(kPointSize);
53 }
54
55 protected:
onShortName()56 SkString onShortName() override {
57 return SkString("lcdblendmodes");
58 }
59
onOnceBeforeDraw()60 void onOnceBeforeDraw() override {
61 fCheckerboard = ToolUtils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 4);
62 }
63
onISize()64 SkISize onISize() override { return SkISize::Make(kWidth, kHeight); }
65
onDraw(SkCanvas * canvas)66 void onDraw(SkCanvas* canvas) override {
67 SkPaint p;
68 p.setAntiAlias(false);
69 p.setStyle(SkPaint::kFill_Style);
70 p.setShader(fCheckerboard);
71 SkRect r = SkRect::MakeWH(SkIntToScalar(kWidth), SkIntToScalar(kHeight));
72 canvas->drawRect(r, p);
73
74 SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
75 SkSurfaceProps props = SkSurfaceProps(0, kRGB_H_SkPixelGeometry);
76 auto surface(ToolUtils::makeSurface(canvas, info, &props));
77
78 SkCanvas* surfCanvas = surface->getCanvas();
79 this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false);
80 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
81 this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false);
82 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
83 this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false);
84 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
85 this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true);
86
87 SkPaint surfPaint;
88 surfPaint.setBlendMode(SkBlendMode::kSrcOver);
89 surface->draw(canvas, 0, 0, SkSamplingOptions(), &surfPaint);
90 }
91
drawColumn(SkCanvas * canvas,SkColor backgroundColor,SkColor textColor,bool useGrad)92 void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
93 const SkBlendMode gModes[] = {
94 SkBlendMode::kClear,
95 SkBlendMode::kSrc,
96 SkBlendMode::kDst,
97 SkBlendMode::kSrcOver,
98 SkBlendMode::kDstOver,
99 SkBlendMode::kSrcIn,
100 SkBlendMode::kDstIn,
101 SkBlendMode::kSrcOut,
102 SkBlendMode::kDstOut,
103 SkBlendMode::kSrcATop,
104 SkBlendMode::kDstATop,
105 SkBlendMode::kXor,
106 SkBlendMode::kPlus,
107 SkBlendMode::kModulate,
108 SkBlendMode::kScreen,
109 SkBlendMode::kOverlay,
110 SkBlendMode::kDarken,
111 SkBlendMode::kLighten,
112 SkBlendMode::kColorDodge,
113 SkBlendMode::kColorBurn,
114 SkBlendMode::kHardLight,
115 SkBlendMode::kSoftLight,
116 SkBlendMode::kDifference,
117 SkBlendMode::kExclusion,
118 SkBlendMode::kMultiply,
119 SkBlendMode::kHue,
120 SkBlendMode::kSaturation,
121 SkBlendMode::kColor,
122 SkBlendMode::kLuminosity,
123 };
124 // Draw background rect
125 SkPaint backgroundPaint;
126 backgroundPaint.setColor(backgroundColor);
127 canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint);
128 SkScalar y = fTextHeight;
129 for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
130 SkPaint paint;
131 paint.setColor(textColor);
132 paint.setBlendMode(gModes[m]);
133 SkFont font(ToolUtils::create_portable_typeface(), fTextHeight);
134 font.setSubpixel(true);
135 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
136 if (useGrad) {
137 SkRect r;
138 r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight);
139 paint.setShader(make_shader(r));
140 }
141 SkString string(SkBlendMode_Name(gModes[m]));
142 canvas->drawString(string, 0, y, font, paint);
143 y+=fTextHeight;
144 }
145 }
146
147 private:
148 SkScalar fTextHeight;
149 sk_sp<SkShader> fCheckerboard;
150 using INHERITED = skiagm::GM;
151 };
152
153 //////////////////////////////////////////////////////////////////////////////
154
155 DEF_GM( return new LcdBlendGM; )
156 } // namespace skiagm
157