blurrect.cpp revision db87c960857a19555517c017e98804af7d9bf8c1 
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    path.addRect(rect);
38    path.setFillType(SkPath::kEvenOdd_FillType);
39
40    canvas->drawPath(path, p);
41}
42
43class BlurRectGM : public skiagm::GM {
44    SkAutoTUnref<SkMaskFilter> fMaskFilter;
45public:
46    BlurRectGM() :
47        fMaskFilter(SkBlurMaskFilter::Create(STROKE_WIDTH/2,
48                                       SkBlurMaskFilter::kNormal_BlurStyle,
49                                       SkBlurMaskFilter::kHighQuality_BlurFlag))
50    {}
51
52protected:
53    virtual SkString onShortName() {
54        return SkString("blurrect");
55    }
56
57    virtual SkISize onISize() {
58        return SkISize::Make(640, 480);
59    }
60
61    virtual void onDraw(SkCanvas* canvas) {
62        canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2);
63
64        SkPaint paint;
65        paint.setMaskFilter(fMaskFilter);
66
67        static const Proc procs[] = {
68            fill_rect, stroke_rect, draw_donut
69        };
70
71        SkRect  r = { 0, 0, 250, 120 };
72
73        this->drawProcs(canvas, r, paint, false, procs, SK_ARRAY_COUNT(procs));
74        canvas->translate(r.width() * 4/3, 0);
75        this->drawProcs(canvas, r, paint, true, procs, SK_ARRAY_COUNT(procs));
76    }
77
78    virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; }
79
80private:
81    void drawProcs(SkCanvas* canvas, const SkRect& r, const SkPaint& paint,
82                   bool doClip, const Proc procs[], size_t procsCount) {
83        SkAutoCanvasRestore acr(canvas, true);
84        for (size_t i = 0; i < procsCount; ++i) {
85            if (doClip) {
86                SkRect clipRect(r);
87                clipRect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2);
88                canvas->save();
89                canvas->clipRect(r);
90            }
91            procs[i](canvas, r, paint);
92            if (doClip) {
93                canvas->restore();
94            }
95            canvas->translate(0, r.height() * 4/3);
96        }
97    }
98
99    typedef GM INHERITED;
100};
101
102//////////////////////////////////////////////////////////////////////////////
103
104DEF_GM(return new BlurRectGM;)
105
106