blurrect.cpp revision 808b70f869572b2f2d6660960578ba39eb0d5d73 
1/*
2 * Copyright 2012 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 "SkBlurMaskFilter.h"
10#include "SkCanvas.h"
11#include "SkPath.h"
12
13#define STROKE_WIDTH    SkIntToScalar(10)
14
15typedef void (*Proc)(SkCanvas*, const SkRect&, const SkPaint&);
16
17static void fill_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
18    canvas->drawRect(r, p);
19}
20
21static void stroke_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
22    SkPaint paint(p);
23    paint.setStyle(SkPaint::kStroke_Style);
24    paint.setStrokeWidth(STROKE_WIDTH);
25    canvas->drawRect(r, paint);
26}
27
28static void draw_donut(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
29    SkRect  rect;
30    SkPath  path;
31
32    rect = r;
33    rect.outset(STROKE_WIDTH/2, STROKE_WIDTH/2);
34    path.addRect(rect);
35    rect = r;
36    rect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2);
37
38    path.addRect(rect);
39    path.setFillType(SkPath::kEvenOdd_FillType);
40
41    canvas->drawPath(path, p);
42}
43
44static void draw_donut_skewed(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
45    SkRect  rect;
46    SkPath  path;
47
48    rect = r;
49    rect.outset(STROKE_WIDTH/2, STROKE_WIDTH/2);
50    path.addRect(rect);
51    rect = r;
52    rect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2);
53
54    rect.offset(7, -7);
55
56    path.addRect(rect);
57    path.setFillType(SkPath::kEvenOdd_FillType);
58
59    canvas->drawPath(path, p);
60}
61
62class BlurRectGM : public skiagm::GM {
63    SkAutoTUnref<SkMaskFilter> fMaskFilter;
64public:
65    BlurRectGM() :
66        fMaskFilter(SkBlurMaskFilter::Create(STROKE_WIDTH/2,
67                                       SkBlurMaskFilter::kNormal_BlurStyle,
68                                       SkBlurMaskFilter::kHighQuality_BlurFlag))
69    {}
70
71protected:
72    virtual SkString onShortName() {
73        return SkString("blurrect");
74    }
75
76    virtual SkISize onISize() {
77        return SkISize::Make(640, 480);
78    }
79
80    virtual void onDraw(SkCanvas* canvas) {
81        canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2);
82
83        SkPaint paint;
84        paint.setMaskFilter(fMaskFilter);
85
86        static const Proc procs[] = {
87            fill_rect, draw_donut, draw_donut_skewed
88        };
89
90        SkRect  r = { 0, 0, 250, 120 };
91
92        this->drawProcs(canvas, r, paint, false, procs, SK_ARRAY_COUNT(procs));
93        canvas->translate(r.width() * 4/3, 0);
94        this->drawProcs(canvas, r, paint, true, procs, SK_ARRAY_COUNT(procs));
95    }
96
97    virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; }
98
99private:
100    void drawProcs(SkCanvas* canvas, const SkRect& r, const SkPaint& paint,
101                   bool doClip, const Proc procs[], size_t procsCount) {
102        SkAutoCanvasRestore acr(canvas, true);
103        for (size_t i = 0; i < procsCount; ++i) {
104            if (doClip) {
105                SkRect clipRect(r);
106                clipRect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2);
107                canvas->save();
108                canvas->clipRect(r);
109            }
110            procs[i](canvas, r, paint);
111            if (doClip) {
112                canvas->restore();
113            }
114            canvas->translate(0, r.height() * 4/3);
115        }
116    }
117
118    typedef GM INHERITED;
119};
120
121//////////////////////////////////////////////////////////////////////////////
122
123DEF_GM(return new BlurRectGM;)
124
125