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 "SkPath.h"
12#include "SkShader.h"
13
14static void test4(SkCanvas* canvas) {
15    SkPaint paint;
16    paint.setAntiAlias(true);
17    SkPoint pts[] = {
18        {10, 160}, {610, 160},
19        {610, 160}, {10, 160},
20
21        {610, 160}, {610, 160},
22        {610, 199}, {610, 199},
23
24        {10, 198}, {610, 198},
25        {610, 199}, {10, 199},
26
27        {10, 160}, {10, 160},
28        {10, 199}, {10, 199}
29    };
30    char verbs[] = {
31        0, 1, 1, 1, 4,
32        0, 1, 1, 1, 4,
33        0, 1, 1, 1, 4,
34        0, 1, 1, 1, 4
35    };
36    SkPath path;
37    SkPoint* ptPtr = pts;
38    for (size_t i = 0; i < sizeof(verbs); ++i) {
39        switch ((SkPath::Verb) verbs[i]) {
40            case SkPath::kMove_Verb:
41                path.moveTo(ptPtr->fX, ptPtr->fY);
42                ++ptPtr;
43                break;
44            case SkPath::kLine_Verb:
45                path.lineTo(ptPtr->fX, ptPtr->fY);
46                ++ptPtr;
47                break;
48            case SkPath::kClose_Verb:
49                path.close();
50                break;
51            default:
52                SkASSERT(false);
53                break;
54        }
55    }
56    SkRect clip = {0, 130, 772, 531};
57    canvas->clipRect(clip);
58    canvas->drawPath(path, paint);
59}
60
61constexpr SkBlendMode gModes[] = {
62    SkBlendMode::kClear,
63    SkBlendMode::kSrc,
64    SkBlendMode::kDst,
65    SkBlendMode::kSrcOver,
66    SkBlendMode::kDstOver,
67    SkBlendMode::kSrcIn,
68    SkBlendMode::kDstIn,
69    SkBlendMode::kSrcOut,
70    SkBlendMode::kDstOut,
71    SkBlendMode::kSrcATop,
72    SkBlendMode::kDstATop,
73    SkBlendMode::kXor,
74};
75
76const int gWidth = 64;
77const int gHeight = 64;
78const SkScalar W = SkIntToScalar(gWidth);
79const SkScalar H = SkIntToScalar(gHeight);
80
81static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
82
83    SkPaint paint;
84    paint.setAntiAlias(true);
85
86    SkRect r = SkRect::MakeWH(W, H);
87    r.inset(W/10, H/10);
88
89    paint.setColor(SK_ColorBLUE);
90    paint.setAlpha(a0);
91    canvas->drawOval(r, paint);
92
93    paint.setColor(SK_ColorRED);
94    paint.setAlpha(a1);
95    paint.setBlendMode(mode);
96
97    SkScalar offset = SK_Scalar1 / 3;
98    SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
99                                   H / 4 + offset,
100                                   W / 2, H / 2);
101    canvas->drawRect(rect, paint);
102
103    return H;
104}
105
106static sk_sp<SkShader> make_bg_shader() {
107    SkBitmap bm;
108    bm.allocN32Pixels(2, 2);
109    *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
110    *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE,
111                                                             0xCF, 0xCE);
112
113    const SkMatrix m = SkMatrix::MakeScale(SkIntToScalar(6), SkIntToScalar(6));
114    return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
115                                      &m);
116}
117
118namespace skiagm {
119
120    class AARectModesGM : public GM {
121        SkPaint fBGPaint;
122    public:
123        AARectModesGM () {
124            fBGPaint.setShader(make_bg_shader());
125        }
126
127    protected:
128
129        SkString onShortName() override {
130            return SkString("aarectmodes");
131        }
132
133        SkISize onISize() override { return SkISize::Make(640, 480); }
134
135        void onDraw(SkCanvas* canvas) override {
136            if (false) { // avoid bit rot, suppress warning
137                test4(canvas);
138            }
139            const SkRect bounds = SkRect::MakeWH(W, H);
140            constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
141
142            canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
143
144            for (int alpha = 0; alpha < 4; ++alpha) {
145                canvas->save();
146                canvas->save();
147                for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
148                    if (6 == i) {
149                        canvas->restore();
150                        canvas->translate(W * 5, 0);
151                        canvas->save();
152                    }
153                    canvas->drawRect(bounds, fBGPaint);
154                    canvas->saveLayer(&bounds, nullptr);
155                    SkScalar dy = drawCell(canvas, gModes[i],
156                                           gAlphaValue[alpha & 1],
157                                           gAlphaValue[alpha & 2]);
158                    canvas->restore();
159
160                    canvas->translate(0, dy * 5 / 4);
161                }
162                canvas->restore();
163                canvas->restore();
164                canvas->translate(W * 5 / 4, 0);
165            }
166        }
167
168    private:
169        typedef GM INHERITED;
170    };
171
172//////////////////////////////////////////////////////////////////////////////
173
174    static GM* MyFactory(void*) { return new AARectModesGM; }
175    static GMRegistry reg(MyFactory);
176
177}
178