SampleBlur.cpp revision 1cab2921ab279367f8206cdadc9259d12e603548 
1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "SampleCode.h"
9#include "SkBlurMaskFilter.h"
10#include "SkColorPriv.h"
11#include "SkGradientShader.h"
12#include "SkView.h"
13#include "SkCanvas.h"
14#include "SkUtils.h"
15
16static SkBitmap make_bitmap() {
17    SkBitmap bm;
18    SkColorTable* ctable = new SkColorTable(256);
19
20    SkPMColor* c = ctable->lockColors();
21    for (int i = 0; i < 256; i++) {
22        c[i] = SkPackARGB32(255 - i, 0, 0, 0);
23    }
24    ctable->unlockColors(true);
25    bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
26    bm.allocPixels(ctable);
27    ctable->unref();
28
29    bm.lockPixels();
30    const float cx = bm.width() * 0.5f;
31    const float cy = bm.height() * 0.5f;
32    for (int y = 0; y < bm.height(); y++) {
33        float dy = y - cy;
34        dy *= dy;
35        uint8_t* p = bm.getAddr8(0, y);
36        for (int x = 0; x < 256; x++) {
37            float dx = x - cx;
38            dx *= dx;
39            float d = (dx + dy) / (cx/2);
40            int id = (int)d;
41            if (id > 255) {
42                id = 255;
43            }
44            p[x] = id;
45        }
46    }
47    bm.unlockPixels();
48    return bm;
49}
50
51class BlurView : public SampleView {
52    SkBitmap    fBM;
53public:
54	BlurView() {
55    }
56
57protected:
58    // overrides from SkEventSink
59    virtual bool onQuery(SkEvent* evt) {
60        if (SampleCode::TitleQ(*evt)) {
61            SampleCode::TitleR(evt, "Blur");
62            return true;
63        }
64        return this->INHERITED::onQuery(evt);
65    }
66
67    void drawBG(SkCanvas* canvas) {
68        canvas->drawColor(0xFFDDDDDD);
69    }
70
71    virtual void onDrawContent(SkCanvas* canvas) {
72        drawBG(canvas);
73
74        SkBlurMaskFilter::BlurStyle NONE = SkBlurMaskFilter::BlurStyle(-999);
75        static const struct {
76            SkBlurMaskFilter::BlurStyle fStyle;
77            int                         fCx, fCy;
78        } gRecs[] = {
79            { NONE,                                 0,  0 },
80            { SkBlurMaskFilter::kInner_BlurStyle,  -1,  0 },
81            { SkBlurMaskFilter::kNormal_BlurStyle,  0,  1 },
82            { SkBlurMaskFilter::kSolid_BlurStyle,   0, -1 },
83            { SkBlurMaskFilter::kOuter_BlurStyle,   1,  0 },
84        };
85
86        SkPaint paint;
87        paint.setAntiAlias(true);
88        paint.setTextSize(25);
89        canvas->translate(-40, 0);
90
91        SkBlurMaskFilter::BlurFlags flags = SkBlurMaskFilter::kNone_BlurFlag;
92        for (int j = 0; j < 2; j++) {
93            canvas->save();
94            paint.setColor(SK_ColorBLUE);
95            for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
96                if (gRecs[i].fStyle != NONE) {
97                    SkMaskFilter* mf = SkBlurMaskFilter::Create(20,
98                                                                gRecs[i].fStyle,
99                                                                flags);
100                    paint.setMaskFilter(mf)->unref();
101                } else {
102                    paint.setMaskFilter(NULL);
103                }
104                canvas->drawCircle(200 + gRecs[i].fCx*100.f,
105                                   200 + gRecs[i].fCy*100.f, 50, paint);
106            }
107            // draw text
108            {
109                SkMaskFilter* mf = SkBlurMaskFilter::Create(4,
110                                                            SkBlurMaskFilter::kNormal_BlurStyle,
111                                                            flags);
112                paint.setMaskFilter(mf)->unref();
113                SkScalar x = SkIntToScalar(70);
114                SkScalar y = SkIntToScalar(400);
115                paint.setColor(SK_ColorBLACK);
116                canvas->drawText("Hamburgefons Style", 18, x, y, paint);
117                canvas->drawText("Hamburgefons Style", 18, x, y + SkIntToScalar(50), paint);
118                paint.setMaskFilter(NULL);
119                paint.setColor(SK_ColorWHITE);
120                x -= SkIntToScalar(2);
121                y -= SkIntToScalar(2);
122                canvas->drawText("Hamburgefons Style", 18, x, y, paint);
123            }
124            canvas->restore();
125            flags = SkBlurMaskFilter::kHighQuality_BlurFlag;
126            canvas->translate(350, 0);
127        }
128    }
129
130private:
131    typedef SkView INHERITED;
132};
133
134//////////////////////////////////////////////////////////////////////////////
135
136static SkView* MyFactory() { return new BlurView; }
137static SkViewRegister reg(MyFactory);
138
139