aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/ClockFaceView.cpp
blob: 4717c30d9e921fb09c87eec6be50d8e21a17db68 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTypeface.h"

static inline SkPMColor rgb2gray(SkPMColor c) {
    unsigned r = SkGetPackedR32(c);
    unsigned g = SkGetPackedG32(c);
    unsigned b = SkGetPackedB32(c);

    unsigned x = (r * 5 + g * 7 + b * 4) >> 4;

    return SkPackARGB32(0, x, x, x) | (c & (SK_A32_MASK << SK_A32_SHIFT));
}

class SkGrayScaleColorFilter : public SkColorFilter {
public:
    virtual void filterSpan(const SkPMColor src[], int count,
                            SkPMColor result[]) const override {
        for (int i = 0; i < count; i++) {
            result[i] = rgb2gray(src[i]);
        }
    }
};

class SkChannelMaskColorFilter : public SkColorFilter {
public:
    SkChannelMaskColorFilter(U8CPU redMask, U8CPU greenMask, U8CPU blueMask) {
        fMask = SkPackARGB32(0xFF, redMask, greenMask, blueMask);
    }

    virtual void filterSpan(const SkPMColor src[], int count,
                            SkPMColor result[]) const override {
        SkPMColor mask = fMask;
        for (int i = 0; i < count; i++) {
            result[i] = src[i] & mask;
        }
    }

private:
    SkPMColor   fMask;
};

///////////////////////////////////////////////////////////////////////////////

#include "SkGradientShader.h"
#include "SkLayerRasterizer.h"
#include "SkBlurMaskFilter.h"

#include "Sk2DPathEffect.h"

class Dot2DPathEffect : public Sk2DPathEffect {
public:
    Dot2DPathEffect(SkScalar radius, const SkMatrix& matrix,
                    SkTDArray<SkPoint>* pts)
    : Sk2DPathEffect(matrix), fRadius(radius), fPts(pts) {}

    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Dot2DPathEffect)

protected:
    void begin(const SkIRect& uvBounds, SkPath* dst) const override {
        if (fPts) {
            fPts->reset();
        }
        this->INHERITED::begin(uvBounds, dst);
    }

    virtual void next(const SkPoint& loc, int u, int v,
                      SkPath* dst) const override {
        if (fPts) {
            *fPts->append() = loc;
        }
        dst->addCircle(loc.fX, loc.fY, fRadius);
    }

    void flatten(SkWriteBuffer& buffer) const override {
        buffer.writeMatrix(this->getMatrix());
        buffer.writeScalar(fRadius);
    }

private:
    SkScalar fRadius;
    SkTDArray<SkPoint>* fPts;

    typedef Sk2DPathEffect INHERITED;
};

SkFlattenable* Dot2DPathEffect::CreateProc(SkReadBuffer& buffer) {
    SkMatrix matrix;
    buffer.readMatrix(&matrix);
    return SkNEW_ARGS(Dot2DPathEffect, (buffer.readScalar(), matrix, NULL));
}

class InverseFillPE : public SkPathEffect {
public:
    InverseFillPE() {}
    virtual bool filterPath(SkPath* dst, const SkPath& src,
                            SkStrokeRec*, const SkRect*) const override {
        *dst = src;
        dst->setFillType(SkPath::kInverseWinding_FillType);
        return true;
    }

#ifndef SK_IGNORE_TO_STRING
    void toString(SkString* str) const override {
        str->appendf("InverseFillPE: ()");
    }
#endif

    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(InverseFillPE)

private:
    typedef SkPathEffect INHERITED;
};

SkFlattenable* InverseFillPE::CreateProc(SkReadBuffer& buffer) {
    return SkNEW(InverseFillPE);
}

static SkPathEffect* makepe(float interp, SkTDArray<SkPoint>* pts) {
    SkMatrix    lattice;
    SkScalar    rad = 3 + SkIntToScalar(4) * (1 - interp);
    lattice.setScale(rad*2, rad*2, 0, 0);
    lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
    return new Dot2DPathEffect(rad, lattice, pts);
}

static void r7(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p, SkScalar interp) {
    p.setPathEffect(makepe(SkScalarToFloat(interp), NULL))->unref();
    rastBuilder->addLayer(p);
#if 0
    p.setPathEffect(new InverseFillPE())->unref();
    p.setXfermodeMode(SkXfermode::kSrcIn_Mode);
    p.setXfermodeMode(SkXfermode::kClear_Mode);
    p.setAlpha((1 - interp) * 255);
    rastBuilder->addLayer(p);
#endif
}

typedef void (*raster_proc)(SkLayerRasterizer*, SkPaint&);

#include "SkXfermode.h"

static void apply_shader(SkPaint* paint, float scale)
{
    SkPaint p;
    SkLayerRasterizer::Builder rastBuilder;

    p.setAntiAlias(true);
    r7(&rastBuilder, p, scale);
    paint->setRasterizer(rastBuilder.detachRasterizer())->unref();

    paint->setColor(SK_ColorBLUE);
}

class ClockFaceView : public SkView {
    SkTypeface* fFace;
    SkScalar fInterp;
    SkScalar fDx;

public:
    ClockFaceView() {
        fFace = SkTypeface::CreateFromFile("/Users/reed/Downloads/p052024l.pfb");
        fInterp = 0;
        fDx = SK_Scalar1/64;
    }

    virtual ~ClockFaceView() {
        SkSafeUnref(fFace);
    }

protected:
    // overrides from SkEventSink
    virtual bool onQuery(SkEvent* evt) {
        if (SampleCode::TitleQ(*evt)) {
            SampleCode::TitleR(evt, "Text Effects");
            return true;
        }
        return this->INHERITED::onQuery(evt);
    }

    void drawBG(SkCanvas* canvas) {
//        canvas->drawColor(0xFFDDDDDD);
        canvas->drawColor(SK_ColorWHITE);
    }

    static void drawdots(SkCanvas* canvas, const SkPaint& orig) {
        SkTDArray<SkPoint> pts;
        SkPathEffect* pe = makepe(0, &pts);

        SkStrokeRec rec(SkStrokeRec::kFill_InitStyle);
        SkPath path, dstPath;
        orig.getTextPath("9", 1, 0, 0, &path);
        pe->filterPath(&dstPath, path, &rec, NULL);

        SkPaint p;
        p.setAntiAlias(true);
        p.setStrokeWidth(10);
        p.setColor(SK_ColorRED);
        canvas->drawPoints(SkCanvas::kPoints_PointMode, pts.count(), pts.begin(),
                           p);
    }

    virtual void onDraw(SkCanvas* canvas) {
        this->drawBG(canvas);

        SkScalar    x = SkIntToScalar(20);
        SkScalar    y = SkIntToScalar(300);
        SkPaint     paint;

        paint.setAntiAlias(true);
        paint.setTextSize(SkIntToScalar(240));
        paint.setTypeface(SkTypeface::CreateFromName("sans-serif",
                                                     SkTypeface::kBold));

        SkString str("9");

        paint.setTypeface(fFace);

        apply_shader(&paint, SkScalarToFloat(fInterp));
        canvas->drawText(str.c_str(), str.size(), x, y, paint);

    //    drawdots(canvas, paint);

        if (false) {
            fInterp += fDx;
            if (fInterp > 1) {
                fInterp = 1;
                fDx = -fDx;
            } else if (fInterp < 0) {
                fInterp = 0;
                fDx = -fDx;
            }
            this->inval(NULL);
        }
    }

private:
    typedef SkView INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory() { return new ClockFaceView; }
static SkViewRegister reg(MyFactory);