nested.cpp revision e0e7cfe44bb9d66d76120a79e5275c294bacaa22 
1/*
2 * Copyright 2013 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 "SkRandom.h"
10#include "SkRRect.h"
11
12namespace skiagm {
13
14// Test out various combinations of nested rects, ovals and rrects.
15class NestedGM : public GM {
16public:
17    NestedGM(bool doAA) : fDoAA(doAA) {
18        this->setBGColor(0xFFDDDDDD);
19    }
20
21protected:
22    virtual SkString onShortName() SK_OVERRIDE {
23        SkString name("nested");
24        if (fDoAA) {
25            name.append("_aa");
26        } else {
27            name.append("_bw");
28        }
29        return name;
30    }
31
32    virtual SkISize onISize() SK_OVERRIDE {
33        return make_isize(kImageWidth, kImageHeight);
34    }
35
36    enum Shapes {
37        kRect_Shape = 0,
38        kRRect_Shape,
39        kOval_Shape,
40        kShapeCount
41    };
42
43    static void AddShape(SkPath* path, const SkRect& rect, Shapes shape, SkPath::Direction dir) {
44        switch (shape) {
45            case kRect_Shape:
46                path->addRect(rect, dir);
47                break;
48            case kRRect_Shape: {
49                SkRRect rr;
50                rr.setRectXY(rect, 5, 5);
51                path->addRRect(rr, dir);
52                break;
53                }
54            case kOval_Shape:
55                path->addOval(rect, dir);
56                break;
57            default:
58                break;
59        }
60    }
61
62    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
63
64        SkPaint shapePaint;
65        shapePaint.setColor(SK_ColorBLACK);
66        shapePaint.setAntiAlias(fDoAA);
67
68        SkRect outerRect = SkRect::MakeWH(40, 40);
69
70        SkRect innerRects[] = {
71            { 10, 10, 30, 30 },     // small
72            { .5f, 18, 4.5f, 22 }   // smaller and offset to left
73        };
74
75        // draw a background pattern to make transparency errors more apparent
76        SkRandom rand;
77
78        for (int y = 0; y < kImageHeight; y += 10) {
79            for (int x = 0; x < kImageWidth; x += 10) {
80                SkRect r = SkRect::MakeXYWH(SkIntToScalar(x),
81                                            SkIntToScalar(y),
82                                            10, 10);
83                SkPaint p;
84                p.setColor(rand.nextU() | 0xFF000000);
85                canvas->drawRect(r, p);
86            }
87        }
88
89        canvas->translate(2, 2);
90        for (int outerShape = 0; outerShape < kShapeCount; ++outerShape) {
91            canvas->save();
92            for (int innerShape = 0; innerShape < kShapeCount; ++innerShape) {
93                for (size_t innerRect = 0; innerRect < SK_ARRAY_COUNT(innerRects); ++innerRect) {
94                    SkPath path;
95
96                    AddShape(&path, outerRect, (Shapes) outerShape, SkPath::kCW_Direction);
97                    AddShape(&path, innerRects[innerRect], (Shapes) innerShape,
98                             SkPath::kCCW_Direction);
99
100                    canvas->drawPath(path, shapePaint);
101                    canvas->translate(45, 0);
102                }
103            }
104            canvas->restore();
105            canvas->translate(0, 45);
106        }
107
108    }
109
110private:
111    static const int kImageWidth = 269;
112    static const int kImageHeight = 134;
113
114    bool fDoAA;
115
116    typedef GM INHERITED;
117};
118
119///////////////////////////////////////////////////////////////////////////////
120
121DEF_GM( return new NestedGM(true); )
122DEF_GM( return new NestedGM(false); )
123
124
125}
126