1 /*
2 * Copyright 2011 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 "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkShader.h"
12
13 constexpr SkBlendMode gModes[] = {
14 SkBlendMode::kClear,
15 SkBlendMode::kSrc,
16 SkBlendMode::kDst,
17 SkBlendMode::kSrcOver,
18 SkBlendMode::kDstOver,
19 SkBlendMode::kSrcIn,
20 SkBlendMode::kDstIn,
21 SkBlendMode::kSrcOut,
22 SkBlendMode::kDstOut,
23 SkBlendMode::kSrcATop,
24 SkBlendMode::kDstATop,
25 SkBlendMode::kXor,
26 };
27
28 const int gWidth = 64;
29 const int gHeight = 64;
30 const SkScalar W = SkIntToScalar(gWidth);
31 const SkScalar H = SkIntToScalar(gHeight);
32
drawCell(SkCanvas * canvas,SkBlendMode mode,SkAlpha a0,SkAlpha a1)33 static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
34
35 SkPaint paint;
36 paint.setAntiAlias(true);
37
38 SkRect r = SkRect::MakeWH(W, H);
39 r.inset(W/10, H/10);
40
41 paint.setColor(SK_ColorBLUE);
42 paint.setAlpha(a0);
43 canvas->drawOval(r, paint);
44
45 paint.setColor(SK_ColorRED);
46 paint.setAlpha(a1);
47 paint.setBlendMode(mode);
48 for (int angle = 0; angle < 24; ++angle) {
49 SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
50 SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
51 paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
52 canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
53 }
54
55 return H;
56 }
57
make_bg_shader()58 static sk_sp<SkShader> make_bg_shader() {
59 SkBitmap bm;
60 bm.allocN32Pixels(2, 2);
61 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
62 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE, 0xCF, 0xCE);
63
64 SkMatrix m;
65 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
66 return SkShader::MakeBitmapShader(bm,
67 SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &m);
68 }
69
70 namespace skiagm {
71
72 class HairModesGM : public GM {
73 SkPaint fBGPaint;
74
75 protected:
onShortName()76 SkString onShortName() override {
77 return SkString("hairmodes");
78 }
79
onISize()80 virtual SkISize onISize() override { return SkISize::Make(640, 480); }
81
onOnceBeforeDraw()82 void onOnceBeforeDraw() override {
83 fBGPaint.setShader(make_bg_shader());
84 }
85
onDraw(SkCanvas * canvas)86 void onDraw(SkCanvas* canvas) override {
87 const SkRect bounds = SkRect::MakeWH(W, H);
88 constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
89
90 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
91
92 for (int alpha = 0; alpha < 4; ++alpha) {
93 canvas->save();
94 canvas->save();
95 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
96 if (6 == i) {
97 canvas->restore();
98 canvas->translate(W * 5, 0);
99 canvas->save();
100 }
101
102 canvas->drawRect(bounds, fBGPaint);
103 canvas->saveLayer(&bounds, nullptr);
104 SkScalar dy = drawCell(canvas, gModes[i],
105 gAlphaValue[alpha & 1],
106 gAlphaValue[alpha & 2]);
107 canvas->restore();
108
109 canvas->translate(0, dy * 5 / 4);
110 }
111 canvas->restore();
112 canvas->restore();
113 canvas->translate(W * 5 / 4, 0);
114 }
115 }
116
117 private:
118 typedef GM INHERITED;
119 };
120
121 //////////////////////////////////////////////////////////////////////////////
122
123 DEF_GM( return new HairModesGM; )
124 }
125