aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/SampleBitmapRect.cpp
blob: 04297e05e778fb47a90b94bb38b48df673b71daa (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

/*
 * 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 "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"

#include "SkOSFile.h"
#include "SkStream.h"

#if SK_SUPPORT_GPU
#include "SkGpuDevice.h"
#else
class GrContext;
#endif

#define INT_SIZE        64
#define SCALAR_SIZE     SkIntToScalar(INT_SIZE)

static void make_bitmap(SkBitmap* bitmap) {
    bitmap->setConfig(SkBitmap::kARGB_8888_Config, INT_SIZE, INT_SIZE);
    bitmap->allocPixels();
    SkCanvas canvas(*bitmap);

    canvas.drawColor(SK_ColorRED);
    SkPaint paint;
    paint.setAntiAlias(true);
    const SkPoint pts[] = { { 0, 0 }, { SCALAR_SIZE, SCALAR_SIZE } };
    const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE };
    paint.setShader(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
                                                   SkShader::kClamp_TileMode))->unref();
    canvas.drawCircle(SCALAR_SIZE/2, SCALAR_SIZE/2, SCALAR_SIZE/2, paint);
}

static SkPoint unit_vec(int degrees) {
    SkScalar rad = SkDegreesToRadians(SkIntToScalar(degrees));
    SkScalar s, c;
    s = SkScalarSinCos(rad, &c);
    return SkPoint::Make(c, s);
}

static void bounce(SkScalar* value, SkScalar* delta, SkScalar min, SkScalar max) {
    *value += *delta;
    if (*value < min) {
        *value = min;
        *delta = - *delta;
    } else if (*value > max) {
        *value = max;
        *delta = - *delta;
    }
}

static void bounce_pt(SkPoint* pt, SkVector* vec, const SkRect& limit) {
    bounce(&pt->fX, &vec->fX, limit.fLeft, limit.fRight);
    bounce(&pt->fY, &vec->fY, limit.fTop, limit.fBottom);
}

class BitmapRectView : public SampleView {
    SkPoint fSrcPts[2];
    SkPoint fSrcVec[2];
    SkRect  fSrcLimit;
    SkRect  fDstR[2];

    void bounce() {
        bounce_pt(&fSrcPts[0], &fSrcVec[0], fSrcLimit);
        bounce_pt(&fSrcPts[1], &fSrcVec[1], fSrcLimit);
    }

public:
    BitmapRectView() {
        this->setBGColor(SK_ColorGRAY);

        fSrcPts[0].set(0, 0);
        fSrcPts[1].set(SCALAR_SIZE, SCALAR_SIZE);

        fSrcVec[0] = unit_vec(30);
        fSrcVec[1] = unit_vec(107);

        fSrcLimit.set(-SCALAR_SIZE/4, -SCALAR_SIZE/4,
                      SCALAR_SIZE*5/4, SCALAR_SIZE*5/4);

        fDstR[0] = SkRect::MakeXYWH(SkIntToScalar(10), SkIntToScalar(100),
                                       SkIntToScalar(250), SkIntToScalar(300));
        fDstR[1] = fDstR[0];
        fDstR[1].offset(fDstR[0].width() * 5/4, 0);

        fSrcPts[0].set(32, 32);
        fSrcPts[1].set(90, 90);
    }

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

    virtual void onDrawContent(SkCanvas* canvas) {
        SkRect srcR;
        srcR.set(fSrcPts[0], fSrcPts[1]);
        srcR = SkRect::MakeXYWH(fSrcPts[0].fX, fSrcPts[0].fY, 32, 32);
        srcR.offset(-srcR.width()/2, -srcR.height()/2);

        SkPaint paint;
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setColor(SK_ColorYELLOW);

        SkBitmap bitmap;
        make_bitmap(&bitmap);

        canvas->translate(20, 20);

        canvas->drawBitmap(bitmap, 0, 0, &paint);
        canvas->drawRect(srcR, paint);

        for (int i = 0; i < 2; ++i) {
            paint.setFilterBitmap(1 == i);
            canvas->drawBitmapRectToRect(bitmap, &srcR, fDstR[i], &paint);
            canvas->drawRect(fDstR[i], paint);
        }

        this->bounce();
        this->inval(NULL);
    }

private:
    typedef SkView INHERITED;
};

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

static void make_big_bitmap(SkBitmap* bm) {
    static const char gText[] =
        "We the people, in order to form a more perfect union, establish justice,"
        " ensure domestic tranquility, provide for the common defense, promote the"
        " general welfare and ensure the blessings of liberty to ourselves and our"
        " posterity, do ordain and establish this constitution for the United"
        " States of America.";

    const int BIG_H = 120;

    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(SkIntToScalar(BIG_H));

    const int BIG_W = SkScalarRoundToInt(paint.measureText(gText, strlen(gText)));

    bm->setConfig(SkBitmap::kARGB_8888_Config, BIG_W, BIG_H);
    bm->allocPixels();
    bm->eraseColor(SK_ColorWHITE);

    SkCanvas canvas(*bm);

    canvas.drawText(gText, strlen(gText), 0, paint.getTextSize()*4/5, paint);
}

class BitmapRectView2 : public SampleView {
    SkBitmap fBitmap;

    SkRect  fSrcR;
    SkRect  fLimitR;
    SkScalar fDX;
    SkRect  fDstR[2];

    void bounceMe() {
        SkScalar width = fSrcR.width();
        bounce(&fSrcR.fLeft, &fDX, fLimitR.fLeft, fLimitR.fRight - width);
        fSrcR.fRight = fSrcR.fLeft + width;
    }

public:
    BitmapRectView2() {
        make_big_bitmap(&fBitmap);

        this->setBGColor(SK_ColorGRAY);

        fSrcR.fLeft = 0;
        fSrcR.fTop = 0;
        fSrcR.fRight = SkIntToScalar(fBitmap.height()) * 3;
        fSrcR.fBottom = SkIntToScalar(fBitmap.height());

        fLimitR.set(0, 0,
                    SkIntToScalar(fBitmap.width()),
                    SkIntToScalar(fBitmap.height()));

        fDX = SK_Scalar1;

        fDstR[0] = SkRect::MakeXYWH(SkIntToScalar(20), SkIntToScalar(20),
                                    SkIntToScalar(600), SkIntToScalar(200));
        fDstR[1] = fDstR[0];
        fDstR[1].offset(0, fDstR[0].height() * 5/4);
    }

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

    virtual void onDrawContent(SkCanvas* canvas) {
        SkPaint paint;
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setColor(SK_ColorYELLOW);

        for (int i = 0; i < 2; ++i) {
            paint.setFilterBitmap(1 == i);
            canvas->drawBitmapRectToRect(fBitmap, &fSrcR, fDstR[i], &paint);
            canvas->drawRect(fDstR[i], paint);
        }

        this->bounceMe();
        this->inval(NULL);
    }

private:
    typedef SkView INHERITED;
};

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

static SkView* F0() { return new BitmapRectView; }
static SkView* F1() { return new BitmapRectView2; }
static SkViewRegister gR0(F0);
static SkViewRegister gR1(F1);