1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#include "SampleCode.h"
8#include "SkView.h"
9#include "SkCanvas.h"
10#include "SkGradientShader.h"
11#include "SkPath.h"
12#include "SkRegion.h"
13#include "SkShader.h"
14#include "SkUtils.h"
15#include "Sk1DPathEffect.h"
16#include "SkCornerPathEffect.h"
17#include "SkPathMeasure.h"
18#include "SkRandom.h"
19#include "SkColorPriv.h"
20#include "SkColorFilter.h"
21#include "SkDither.h"
22
23// exercise scale/linear/devkern
24struct Setting {
25    bool        fLinearText;
26    bool        fDevKernText;
27};
28
29static const Setting gSettings[] = {
30    { false,  false   },
31    { false,  true    },
32    { true,   false   },
33    { true,   true    },
34};
35
36static void doMeasure(SkCanvas* canvas, const SkPaint& paint, const char text[]) {
37    SkScalar    dy = paint.getFontMetrics(nullptr);
38
39    size_t      len = strlen(text);
40    SkAutoTMalloc<SkScalar> autoWidths(len);
41    SkScalar*   widths = autoWidths.get();
42    SkAutoTMalloc<SkRect> autoRects(len);
43    SkRect*     rects = autoRects.get();
44    SkRect      bounds;
45
46    SkPaint p(paint);
47    for (size_t i = 0; i < SK_ARRAY_COUNT(gSettings); i++) {
48        p.setLinearText(gSettings[i].fLinearText);
49        p.setDevKernText(gSettings[i].fDevKernText);
50
51        int n = p.getTextWidths(text, len, widths, rects);
52        SkScalar w = p.measureText(text, len, &bounds);
53
54        p.setStyle(SkPaint::kFill_Style);
55        p.setColor(0x8888FF88);
56        canvas->drawRect(bounds, p);
57        p.setColor(0xFF000000);
58        canvas->drawText(text, len, 0, 0, p);
59
60        p.setStyle(SkPaint::kStroke_Style);
61        p.setStrokeWidth(0);
62        p.setColor(0xFFFF0000);
63        SkScalar x = 0;
64        for (int j = 0; j < n; j++) {
65            SkRect r = rects[j];
66            r.offset(x, 0);
67            canvas->drawRect(r, p);
68            x += widths[j];
69        }
70
71        p.setColor(0xFF0000FF);
72        canvas->drawLine(0, 0, w, 0, p);
73        p.setStrokeWidth(SkIntToScalar(4));
74        canvas->drawPoint(x, 0, p);
75
76        canvas->translate(0, dy);
77    }
78}
79
80class MeasureView : public SampleView {
81public:
82    SkPaint fPaint;
83
84    MeasureView() {
85        fPaint.setAntiAlias(true);
86        fPaint.setTextSize(SkIntToScalar(64));
87        this->setBGColor(0xFFDDDDDD);
88    }
89
90protected:
91    // overrides from SkEventSink
92    virtual bool onQuery(SkEvent* evt) {
93        if (SampleCode::TitleQ(*evt)) {
94            SampleCode::TitleR(evt, "Measure");
95            return true;
96        }
97        return this->INHERITED::onQuery(evt);
98    }
99
100    virtual void onDrawContent(SkCanvas* canvas) {
101        canvas->translate(fPaint.getTextSize(), fPaint.getTextSize());
102        doMeasure(canvas, fPaint, "Hamburgefons");
103    }
104
105private:
106    typedef SampleView INHERITED;
107};
108
109//////////////////////////////////////////////////////////////////////////////
110
111static SkView* MyFactory() { return new MeasureView; }
112static SkViewRegister reg(MyFactory);
113