aboutsummaryrefslogtreecommitdiffstats
path: root/samplecode/SampleFontCache.cpp
blob: f5952c419e0e91c79ef572aae875148e384930bb (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
/*
 * 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 "Sample.h"
#include "SkCanvas.h"
#include "SkGraphics.h"
#include "SkRandom.h"

#include <pthread.h>

static void call_measure() {
    SkPaint paint;
    uint16_t text[32];
    SkRandom rand;

    paint.setAntiAlias(true);
    paint.setTextEncoding(kUTF16_SkTextEncoding);
    for (int j = 0; j < SK_ARRAY_COUNT(text); j++)
        text[j] = (uint16_t)((rand.nextU() & 0xFF) + 32);

    for (int i = 9; i < 36; i++) {
        SkFontMetrics m;

        paint.setTextSize(SkIntToScalar(i));
        paint.getFontMetrics(&m);
        paint.measureText(text, sizeof(text));
    }
}

static void call_draw(SkCanvas* canvas) {
    SkPaint paint;
    uint16_t text[32];
    SkRandom rand;

    paint.setAntiAlias(true);
    paint.setTextEncoding(kUTF16_SkTextEncoding);
    for (int j = 0; j < SK_ARRAY_COUNT(text); j++)
        text[j] = (uint16_t)((rand.nextU() & 0xFF) + 32);

    SkScalar x = SkIntToScalar(10);
    SkScalar y = SkIntToScalar(20);

    canvas->drawColor(SK_ColorWHITE);
    for (int i = 9; i < 36; i++)
    {
        SkFontMetrics m;

        paint.setTextSize(SkIntToScalar(i));
        paint.getFontMetrics(&m);
        canvas->drawText(text, sizeof(text), x, y, paint);
        y += m.fDescent - m.fAscent;
    }
}

static bool gDone;

static void* measure_proc(void* context) {
    while (!gDone) {
        call_measure();
    }
    return nullptr;
}

static void* draw_proc(void* context) {
    SkBitmap* bm = (SkBitmap*)context;
    SkCanvas    canvas(*bm);

    while (!gDone) {
        call_draw(&canvas);
    }
    return nullptr;
}

class FontCacheView : public Sample {
public:
    enum { N = 4 };

    pthread_t   fMThreads[N];
    pthread_t   fDThreads[N];
    SkBitmap    fBitmaps[N];

    FontCacheView() {
        gDone = false;
        for (int i = 0; i < N; i++) {
            int status;

            status = pthread_create(&fMThreads[i], nullptr,  measure_proc, nullptr);
            SkASSERT(0 == status);

            fBitmaps[i].allocPixels(SkImageInfo::Make(320, 240,
                                                      kRGB_565_SkColorType,
                                                      kOpaque_SkAlphaType));
            status = pthread_create(&fDThreads[i], nullptr,  draw_proc, &fBitmaps[i]);
            SkASSERT(0 == status);
        }
        this->setBGColor(0xFFDDDDDD);
    }

    virtual ~FontCacheView() {
        gDone = true;
        for (int i = 0; i < N; i++) {
            void* ret;
            int status = pthread_join(fMThreads[i], &ret);
            SkASSERT(0 == status);
            status = pthread_join(fDThreads[i], &ret);
            SkASSERT(0 == status);
        }
    }

protected:
    virtual bool onQuery(Sample::Event* evt) {
        if (Sample::TitleQ(*evt)) {
            Sample::TitleR(evt, "FontCache");
            return true;
        }
        return this->INHERITED::onQuery(evt);
    }

    virtual void onDrawContent(SkCanvas* canvas) {
        SkScalar x = 0;
        SkScalar y = 0;
        for (int i = 0; i < N; i++) {
            canvas->drawBitmap(fBitmaps[i], x, y);
            x += SkIntToScalar(fBitmaps[i].width());
        }
        this->inval(nullptr);
    }

private:
    typedef Sample INHERITED;
};

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

static Sample* MyFactory() { return new FontCacheView; }
static SampleRegister reg(MyFactory);