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 "SkView.h"
10#include "SkCanvas.h"
11#include "SkGradientShader.h"
12#include "SkPath.h"
13#include "SkRegion.h"
14#include "SkShader.h"
15#include "SkUtils.h"
16#include "SkColorPriv.h"
17#include "SkColorFilter.h"
18#include "SkTypeface.h"
19#include "SkAvoidXfermode.h"
20
21static inline SkPMColor rgb2gray(SkPMColor c)
22{
23    unsigned r = SkGetPackedR32(c);
24    unsigned g = SkGetPackedG32(c);
25    unsigned b = SkGetPackedB32(c);
26
27    unsigned x = (r * 5 + g * 7 + b * 4) >> 4;
28
29    return SkPackARGB32(0, x, x, x) | (c & (SK_A32_MASK << SK_A32_SHIFT));
30}
31
32class SkGrayScaleColorFilter : public SkColorFilter {
33public:
34    virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[])
35    {
36        for (int i = 0; i < count; i++)
37            result[i] = rgb2gray(src[i]);
38    }
39};
40
41class SkChannelMaskColorFilter : public SkColorFilter {
42public:
43    SkChannelMaskColorFilter(U8CPU redMask, U8CPU greenMask, U8CPU blueMask)
44    {
45        fMask = SkPackARGB32(0xFF, redMask, greenMask, blueMask);
46    }
47
48    virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[])
49    {
50        SkPMColor mask = fMask;
51        for (int i = 0; i < count; i++)
52            result[i] = src[i] & mask;
53    }
54
55private:
56    SkPMColor   fMask;
57};
58
59///////////////////////////////////////////////////////////
60
61#include "SkGradientShader.h"
62#include "SkLayerRasterizer.h"
63#include "SkBlurMaskFilter.h"
64
65#include "Sk2DPathEffect.h"
66
67class Dot2DPathEffect : public Sk2DPathEffect {
68public:
69    Dot2DPathEffect(SkScalar radius, const SkMatrix& matrix,
70                    SkTDArray<SkPoint>* pts)
71    : Sk2DPathEffect(matrix), fRadius(radius), fPts(pts) {}
72
73    virtual void flatten(SkFlattenableWriteBuffer& buffer)
74    {
75        this->INHERITED::flatten(buffer);
76
77        buffer.writeScalar(fRadius);
78    }
79    virtual Factory getFactory() { return CreateProc; }
80
81protected:
82    virtual void begin(const SkIRect& uvBounds, SkPath* dst) {
83        if (fPts) {
84            fPts->reset();
85        }
86        this->INHERITED::begin(uvBounds, dst);
87    }
88//    virtual void end(SkPath* dst) {}
89	virtual void next(const SkPoint& loc, int u, int v, SkPath* dst)
90    {
91        if (fPts) {
92            *fPts->append() = loc;
93        }
94        dst->addCircle(loc.fX, loc.fY, fRadius);
95    }
96
97    Dot2DPathEffect(SkFlattenableReadBuffer& buffer) : Sk2DPathEffect(buffer)
98    {
99        fRadius = buffer.readScalar();
100        fPts = NULL;
101    }
102private:
103    SkScalar fRadius;
104    SkTDArray<SkPoint>* fPts;
105
106    static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer)
107    {
108        return new Dot2DPathEffect(buffer);
109    }
110
111    typedef Sk2DPathEffect INHERITED;
112};
113
114class InverseFillPE : public SkPathEffect {
115public:
116    InverseFillPE() {}
117    virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width) {
118        *dst = src;
119        dst->setFillType(SkPath::kInverseWinding_FillType);
120        return true;
121    }
122    virtual Factory getFactory() { return Factory; }
123protected:
124//    InverseFillPE(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
125private:
126    static SkFlattenable* Factory(SkFlattenableReadBuffer& buffer) {
127        return new InverseFillPE;
128    }
129    typedef SkPathEffect INHERITED;
130};
131
132static SkPathEffect* makepe(float interp, SkTDArray<SkPoint>* pts) {
133    SkMatrix    lattice;
134    SkScalar    rad = 3 + SkIntToScalar(4) * (1 - interp);
135    lattice.setScale(rad*2, rad*2, 0, 0);
136    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
137    return new Dot2DPathEffect(rad, lattice, pts);
138}
139
140static void r7(SkLayerRasterizer* rast, SkPaint& p, SkScalar interp) {
141    p.setPathEffect(makepe(interp, NULL))->unref();
142    rast->addLayer(p);
143#if 0
144    p.setPathEffect(new InverseFillPE())->unref();
145    p.setXfermodeMode(SkXfermode::kSrcIn_Mode);
146    p.setXfermodeMode(SkXfermode::kClear_Mode);
147    p.setAlpha((1 - interp) * 255);
148    rast->addLayer(p);
149#endif
150}
151
152typedef void (*raster_proc)(SkLayerRasterizer*, SkPaint&);
153
154#include "SkXfermode.h"
155
156static void apply_shader(SkPaint* paint, float scale)
157{
158    SkPaint p;
159    SkLayerRasterizer*  rast = new SkLayerRasterizer;
160
161    p.setAntiAlias(true);
162    r7(rast, p, scale);
163    paint->setRasterizer(rast)->unref();
164
165    paint->setColor(SK_ColorBLUE);
166}
167
168class ClockFaceView : public SkView {
169    SkTypeface* fFace;
170    SkScalar fInterp;
171    SkScalar fDx;
172public:
173	ClockFaceView()
174    {
175        fFace = SkTypeface::CreateFromFile("/Users/reed/Downloads/p052024l.pfb");
176        fInterp = 0;
177        fDx = SK_Scalar1/64;
178    }
179
180    virtual ~ClockFaceView()
181    {
182        SkSafeUnref(fFace);
183    }
184
185protected:
186    // overrides from SkEventSink
187    virtual bool onQuery(SkEvent* evt)
188    {
189        if (SampleCode::TitleQ(*evt))
190        {
191            SampleCode::TitleR(evt, "Text Effects");
192            return true;
193        }
194        return this->INHERITED::onQuery(evt);
195    }
196
197    void drawBG(SkCanvas* canvas)
198    {
199//        canvas->drawColor(0xFFDDDDDD);
200        canvas->drawColor(SK_ColorWHITE);
201    }
202
203    static void drawdots(SkCanvas* canvas, const SkPaint& orig) {
204        SkTDArray<SkPoint> pts;
205        SkPathEffect* pe = makepe(0, &pts);
206
207        SkScalar width = -1;
208        SkPath path, dstPath;
209        orig.getTextPath("9", 1, 0, 0, &path);
210        pe->filterPath(&dstPath, path, &width);
211
212        SkPaint p;
213        p.setAntiAlias(true);
214        p.setStrokeWidth(10);
215        p.setColor(SK_ColorRED);
216        canvas->drawPoints(SkCanvas::kPoints_PointMode, pts.count(), pts.begin(),
217                           p);
218    }
219
220    virtual void onDraw(SkCanvas* canvas) {
221        this->drawBG(canvas);
222
223        SkScalar    x = SkIntToScalar(20);
224        SkScalar    y = SkIntToScalar(300);
225        SkPaint     paint;
226
227        paint.setAntiAlias(true);
228        paint.setTextSize(SkIntToScalar(240));
229        paint.setTypeface(SkTypeface::CreateFromName("sans-serif",
230                                                     SkTypeface::kBold));
231
232        SkString str("9");
233
234        paint.setTypeface(fFace);
235
236        apply_shader(&paint, fInterp);
237        canvas->drawText(str.c_str(), str.size(), x, y, paint);
238
239    //    drawdots(canvas, paint);
240
241        if (false) {
242            fInterp += fDx;
243            if (fInterp > 1) {
244                fInterp = 1;
245                fDx = -fDx;
246            } else if (fInterp < 0) {
247                fInterp = 0;
248                fDx = -fDx;
249            }
250            this->inval(NULL);
251        }
252    }
253
254private:
255    typedef SkView INHERITED;
256};
257
258//////////////////////////////////////////////////////////////////////////////
259
260static SkView* MyFactory() { return new ClockFaceView; }
261static SkViewRegister reg(MyFactory);
262
263