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    for (int angle = 0; angle < 24; ++angle) {
50        SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
51        SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
52        paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
53        canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
54    }
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, 0xCC, 0xCC);
64
65    SkMatrix m;
66    m.setScale(SkIntToScalar(6), SkIntToScalar(6));
67
68    return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
69                                      SkShader::kRepeat_TileMode, &m);
70}
71
72class HairModesView : public SampleView {
73    SkPaint fBGPaint;
74public:
75    HairModesView() {
76        fBGPaint.setShader(make_bg_shader());
77    }
78
79protected:
80    // overrides from SkEventSink
81    virtual bool onQuery(SkEvent* evt) {
82        if (SampleCode::TitleQ(*evt)) {
83            SampleCode::TitleR(evt, "HairlineModes");
84            return true;
85        }
86        return this->INHERITED::onQuery(evt);
87    }
88
89    virtual void onDrawContent(SkCanvas* canvas) {
90        const SkRect bounds = SkRect::MakeWH(W, H);
91        static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
92
93        canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
94
95        for (int alpha = 0; alpha < 4; ++alpha) {
96            canvas->save();
97            canvas->save();
98            for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
99                if (6 == i) {
100                    canvas->restore();
101                    canvas->translate(W * 5, 0);
102                    canvas->save();
103                }
104                canvas->drawRect(bounds, fBGPaint);
105                canvas->saveLayer(&bounds, nullptr);
106                SkScalar dy = drawCell(canvas, gModes[i],
107                                       gAlphaValue[alpha & 1],
108                                       gAlphaValue[alpha & 2]);
109                canvas->restore();
110
111                canvas->translate(0, dy * 5 / 4);
112            }
113            canvas->restore();
114            canvas->restore();
115            canvas->translate(W * 5 / 4, 0);
116        }
117    }
118
119private:
120    typedef SampleView INHERITED;
121};
122
123///////////////////////////////////////////////////////////////////////////////
124
125static SkView* MyFactory() { return new HairModesView; }
126static SkViewRegister reg(MyFactory);
127