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
15static 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
30const int gWidth = 64;
31const int gHeight = 64;
32const SkScalar W = SkIntToScalar(gWidth);
33const SkScalar H = SkIntToScalar(gHeight);
34
35static 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
59static 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
75class AARectsModesView : public SampleView {
76    SkPaint fBGPaint;
77public:
78    AARectsModesView () {
79        fBGPaint.setShader(make_bg_shader());
80    }
81
82protected:
83    // overrides from SkEventSink
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
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
122private:
123    typedef SampleView INHERITED;
124};
125
126///////////////////////////////////////////////////////////////////////////////
127
128static SkView* MyFactory() { return new AARectsModesView; }
129static SkViewRegister reg(MyFactory);
130