blurrect.cpp revision 53007a2b1724c15c170340658daac012f9d909be 
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
62#include "SkGradientShader.h"
63
64typedef void (*PaintProc)(SkPaint*, SkScalar width);
65
66static void setgrad(SkPaint* paint, SkScalar width) {
67    SkPoint pts[] = { { 0, 0 }, { width, 0 } };
68    SkColor colors[] = { SK_ColorRED, SK_ColorGREEN };
69    SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
70                                                 SkShader::kClamp_TileMode);
71    paint->setShader(s)->unref();
72}
73
74class BlurRectGM : public skiagm::GM {
75    SkAutoTUnref<SkMaskFilter> fMaskFilter;
76    SkString  fName;
77    PaintProc fPProc;
78    SkAlpha   fAlpha;
79public:
80    BlurRectGM(const char name[], PaintProc pproc, U8CPU alpha) :
81        fMaskFilter(SkBlurMaskFilter::Create(STROKE_WIDTH/2,
82                                       SkBlurMaskFilter::kNormal_BlurStyle,
83                                       SkBlurMaskFilter::kHighQuality_BlurFlag))
84        , fName(name)
85        , fPProc(pproc)
86        , fAlpha(SkToU8(alpha))
87    {}
88
89protected:
90    virtual SkString onShortName() {
91        return fName;
92    }
93
94    virtual SkISize onISize() {
95        return SkISize::Make(640, 480);
96    }
97
98    virtual void onDraw(SkCanvas* canvas) {
99        canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2);
100
101        SkRect  r = { 0, 0, 250, 120 };
102
103        SkPaint paint;
104        paint.setMaskFilter(fMaskFilter);
105        if (fPProc) {
106            fPProc(&paint, r.width());
107        }
108        paint.setAlpha(fAlpha);
109
110        static const Proc procs[] = {
111            fill_rect, draw_donut, draw_donut_skewed
112        };
113
114        this->drawProcs(canvas, r, paint, false, procs, SK_ARRAY_COUNT(procs));
115        canvas->translate(r.width() * 4/3, 0);
116        this->drawProcs(canvas, r, paint, true, procs, SK_ARRAY_COUNT(procs));
117    }
118
119    virtual uint32_t onGetFlags() const { return kSkipPipe_Flag; }
120
121private:
122    void drawProcs(SkCanvas* canvas, const SkRect& r, const SkPaint& paint,
123                   bool doClip, const Proc procs[], size_t procsCount) {
124        SkAutoCanvasRestore acr(canvas, true);
125        for (size_t i = 0; i < procsCount; ++i) {
126            if (doClip) {
127                SkRect clipRect(r);
128                clipRect.inset(STROKE_WIDTH/2, STROKE_WIDTH/2);
129                canvas->save();
130                canvas->clipRect(r);
131            }
132            procs[i](canvas, r, paint);
133            if (doClip) {
134                canvas->restore();
135            }
136            canvas->translate(0, r.height() * 4/3);
137        }
138    }
139
140    typedef GM INHERITED;
141};
142
143//////////////////////////////////////////////////////////////////////////////
144
145DEF_GM(return new BlurRectGM("blurrect", NULL, 0xFF);)
146DEF_GM(return new BlurRectGM("blurrect_grad_80", setgrad, 0x80);)
147
148