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