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 "SkBlurMaskFilter.h"
11#include "SkCanvas.h"
12#include "SkGradientShader.h"
13#include "SkGraphics.h"
14#include "SkImageDecoder.h"
15#include "SkPath.h"
16#include "SkRandom.h"
17#include "SkRegion.h"
18#include "SkShader.h"
19#include "SkUtils.h"
20#include "SkXfermode.h"
21#include "SkColorPriv.h"
22#include "SkColorFilter.h"
23#include "SkTime.h"
24#include "SkTypeface.h"
25
26#include "SkOSFile.h"
27#include "SkStream.h"
28
29static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
30    if (bm.config() != SkBitmap::kRGB_565_Config) {
31        return;
32    }
33
34    for (int y = 0; y < bm.height(); y++) {
35        for (int x = 0; x < bm.width(); x++) {
36            uint16_t c = *bm.getAddr16(x, y);
37            if (c != 0xFFFF) {
38                SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
39                return;
40            }
41        }
42    }
43}
44
45class TextAlphaView : public SampleView {
46public:
47	TextAlphaView() {
48        fByte = 0xFF;
49    }
50
51protected:
52    // overrides from SkEventSink
53    virtual bool onQuery(SkEvent* evt)  {
54        if (SampleCode::TitleQ(*evt)) {
55            SkString str("TextAlpha");
56            SampleCode::TitleR(evt, str.c_str());
57            return true;
58        }
59        return this->INHERITED::onQuery(evt);
60    }
61
62    virtual void onDrawContent(SkCanvas* canvas) {
63        const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
64        SkPaint paint;
65        SkScalar    x = SkIntToScalar(10);
66        SkScalar    y = SkIntToScalar(20);
67
68        paint.setFlags(0x105);
69
70        paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
71
72        paint.setMaskFilter(SkBlurMaskFilter::Create(SkIntToScalar(3),
73                                        SkBlurMaskFilter::kNormal_BlurStyle));
74        paint.getMaskFilter()->unref();
75
76        SkRandom rand;
77
78        for (int ps = 6; ps <= 35; ps++) {
79            paint.setColor(rand.nextU() | (0xFF << 24));
80            paint.setTextSize(SkIntToScalar(ps));
81            paint.setTextSize(SkIntToScalar(24));
82            canvas->drawText(str, strlen(str), x, y, paint);
83            y += paint.getFontMetrics(NULL);
84        }
85        //check_for_nonwhite(canvas->getDevice()->accessBitmap(), fByte);
86        //SkDebugf("------ byte %x\n", fByte);
87
88        if (false) {
89            fByte += 1;
90            fByte &= 0xFF;
91            this->inval(NULL);
92        }
93    }
94
95    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
96        return new Click(this);
97    }
98
99    virtual bool onClick(Click* click) {
100        int y = click->fICurr.fY;
101        if (y < 0) {
102            y = 0;
103        } else if (y > 255) {
104            y = 255;
105        }
106        fByte = y;
107        this->inval(NULL);
108        return true;
109    }
110
111private:
112    int fByte;
113
114    typedef SampleView INHERITED;
115};
116
117//////////////////////////////////////////////////////////////////////////////
118
119static SkView* MyFactory() { return new TextAlphaView; }
120static SkViewRegister reg(MyFactory);
121
122