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 "SampleCode.h"
9 #include "SkView.h"
10 #include "SkBitmap.h"
11 #include "SkCanvas.h"
12 #include "SkColorPriv.h"
13 #include "SkShader.h"
14
15 static const SkBlendMode gModes[] = {
16 SkBlendMode::kClear,
17 SkBlendMode::kSrc,
18 SkBlendMode::kDst,
19 SkBlendMode::kSrcOver,
20 SkBlendMode::kDstOver,
21 SkBlendMode::kSrcIn,
22 SkBlendMode::kDstIn,
23 SkBlendMode::kSrcOut,
24 SkBlendMode::kDstOut,
25 SkBlendMode::kSrcATop,
26 SkBlendMode::kDstATop,
27 SkBlendMode::kXor,
28 };
29
30 const int gWidth = 64;
31 const int gHeight = 64;
32 const SkScalar W = SkIntToScalar(gWidth);
33 const SkScalar H = SkIntToScalar(gHeight);
34
drawCell(SkCanvas * canvas,SkBlendMode mode,SkAlpha a0,SkAlpha a1)35 static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
36 SkPaint paint;
37 paint.setAntiAlias(true);
38
39 SkRect r = SkRect::MakeWH(W, H);
40 r.inset(W/10, H/10);
41
42 paint.setColor(SK_ColorBLUE);
43 paint.setAlpha(a0);
44 canvas->drawOval(r, paint);
45
46 paint.setColor(SK_ColorRED);
47 paint.setAlpha(a1);
48 paint.setBlendMode(mode);
49
50 SkScalar offset = SK_Scalar1 / 3;
51 SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
52 H / 4 + offset,
53 W / 2, H / 2);
54 canvas->drawRect(rect, paint);
55
56 return H;
57 }
58
make_bg_shader()59 static sk_sp<SkShader> make_bg_shader() {
60 SkBitmap bm;
61 bm.allocN32Pixels(2, 2);
62 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
63 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC,
64 0xCC, 0xCC);
65
66 SkMatrix m;
67 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
68
69 return SkShader::MakeBitmapShader(bm,
70 SkShader::kRepeat_TileMode,
71 SkShader::kRepeat_TileMode,
72 &m);
73 }
74
75 class AARectsModesView : public SampleView {
76 SkPaint fBGPaint;
77 public:
AARectsModesView()78 AARectsModesView () {
79 fBGPaint.setShader(make_bg_shader());
80 }
81
82 protected:
83 // overrides from SkEventSink
onQuery(SkEvent * evt)84 virtual bool onQuery(SkEvent* evt) {
85 if (SampleCode::TitleQ(*evt)) {
86 SampleCode::TitleR(evt, "AARectsModes");
87 return true;
88 }
89 return this->INHERITED::onQuery(evt);
90 }
91
onDrawContent(SkCanvas * canvas)92 virtual void onDrawContent(SkCanvas* canvas) {
93 const SkRect bounds = SkRect::MakeWH(W, H);
94 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
95
96 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
97
98 for (int alpha = 0; alpha < 4; ++alpha) {
99 canvas->save();
100 canvas->save();
101 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
102 if (6 == i) {
103 canvas->restore();
104 canvas->translate(W * 5, 0);
105 canvas->save();
106 }
107
108 canvas->drawRect(bounds, fBGPaint);
109 canvas->saveLayer(&bounds, nullptr);
110 SkScalar dy = drawCell(canvas, gModes[i], gAlphaValue[alpha & 1],
111 gAlphaValue[alpha & 2]);
112 canvas->restore();
113
114 canvas->translate(0, dy * 5 / 4);
115 }
116 canvas->restore();
117 canvas->restore();
118 canvas->translate(W * 5 / 4, 0);
119 }
120 }
121
122 private:
123 typedef SampleView INHERITED;
124 };
125
126 ///////////////////////////////////////////////////////////////////////////////
127
MyFactory()128 static SkView* MyFactory() { return new AARectsModesView; }
129 static SkViewRegister reg(MyFactory);
130