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 auto surface(ToolUtils::makeSurface(canvas, info));
76
77 SkCanvas* surfCanvas = surface->getCanvas();
78 this->drawColumn(surfCanvas, SK_ColorBLACK, SK_ColorWHITE, false);
79 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
80 this->drawColumn(surfCanvas, SK_ColorWHITE, SK_ColorBLACK, false);
81 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
82 this->drawColumn(surfCanvas, SK_ColorGREEN, SK_ColorMAGENTA, false);
83 surfCanvas->translate(SkIntToScalar(kColWidth), 0);
84 this->drawColumn(surfCanvas, SK_ColorCYAN, SK_ColorMAGENTA, true);
85
86 SkPaint surfPaint;
87 surfPaint.setBlendMode(SkBlendMode::kSrcOver);
88 surface->draw(canvas, 0, 0, &surfPaint);
89 }
90
drawColumn(SkCanvas * canvas,SkColor backgroundColor,SkColor textColor,bool useGrad)91 void drawColumn(SkCanvas* canvas, SkColor backgroundColor, SkColor textColor, bool useGrad) {
92 const SkBlendMode gModes[] = {
93 SkBlendMode::kClear,
94 SkBlendMode::kSrc,
95 SkBlendMode::kDst,
96 SkBlendMode::kSrcOver,
97 SkBlendMode::kDstOver,
98 SkBlendMode::kSrcIn,
99 SkBlendMode::kDstIn,
100 SkBlendMode::kSrcOut,
101 SkBlendMode::kDstOut,
102 SkBlendMode::kSrcATop,
103 SkBlendMode::kDstATop,
104 SkBlendMode::kXor,
105 SkBlendMode::kPlus,
106 SkBlendMode::kModulate,
107 SkBlendMode::kScreen,
108 SkBlendMode::kOverlay,
109 SkBlendMode::kDarken,
110 SkBlendMode::kLighten,
111 SkBlendMode::kColorDodge,
112 SkBlendMode::kColorBurn,
113 SkBlendMode::kHardLight,
114 SkBlendMode::kSoftLight,
115 SkBlendMode::kDifference,
116 SkBlendMode::kExclusion,
117 SkBlendMode::kMultiply,
118 SkBlendMode::kHue,
119 SkBlendMode::kSaturation,
120 SkBlendMode::kColor,
121 SkBlendMode::kLuminosity,
122 };
123 // Draw background rect
124 SkPaint backgroundPaint;
125 backgroundPaint.setColor(backgroundColor);
126 canvas->drawRect(SkRect::MakeIWH(kColWidth, kHeight), backgroundPaint);
127 SkScalar y = fTextHeight;
128 for (size_t m = 0; m < SK_ARRAY_COUNT(gModes); m++) {
129 SkPaint paint;
130 paint.setColor(textColor);
131 paint.setBlendMode(gModes[m]);
132 SkFont font(ToolUtils::create_portable_typeface(), fTextHeight);
133 font.setSubpixel(true);
134 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
135 if (useGrad) {
136 SkRect r;
137 r.setXYWH(0, y - fTextHeight, SkIntToScalar(kColWidth), fTextHeight);
138 paint.setShader(make_shader(r));
139 }
140 SkString string(SkBlendMode_Name(gModes[m]));
141 canvas->drawString(string, 0, y, font, paint);
142 y+=fTextHeight;
143 }
144 }
145
146 private:
147 SkScalar fTextHeight;
148 sk_sp<SkShader> fCheckerboard;
149 typedef skiagm::GM INHERITED;
150 };
151
152 //////////////////////////////////////////////////////////////////////////////
153
154 DEF_GM( return new LcdBlendGM; )
155 }
156