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 "SkBlurMask.h"
10 #include "SkBlurMaskFilter.h"
11 #include "SkCanvas.h"
12 #include "SkDevice.h"
13 #include "SkGradientShader.h"
14 #include "SkGraphics.h"
15 #include "SkImageDecoder.h"
16 #include "SkPath.h"
17 #include "SkRandom.h"
18 #include "SkRegion.h"
19 #include "SkShader.h"
20 #include "SkUtils.h"
21 #include "SkXfermode.h"
22 #include "SkColorPriv.h"
23 #include "SkColorFilter.h"
24 #include "SkTime.h"
25 #include "SkTypeface.h"
26 #include "SkView.h"
27
28 #include "SkOSFile.h"
29 #include "SkStream.h"
30
31 class TextAlphaView : public SampleView {
32 public:
TextAlphaView()33 TextAlphaView() {
34 fByte = 0xFF;
35 }
36
37 protected:
38 // overrides from SkEventSink
onQuery(SkEvent * evt)39 bool onQuery(SkEvent* evt) override {
40 if (SampleCode::TitleQ(*evt)) {
41 SampleCode::TitleR(evt, "TextAlpha");
42 return true;
43 }
44 return this->INHERITED::onQuery(evt);
45 }
46
onDrawContent(SkCanvas * canvas)47 void onDrawContent(SkCanvas* canvas) override {
48 const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
49 SkPaint paint;
50 SkScalar x = SkIntToScalar(10);
51 SkScalar y = SkIntToScalar(20);
52
53 paint.setFlags(0x105);
54
55 paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
56
57 paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
58 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
59 paint.getMaskFilter()->unref();
60
61 SkRandom rand;
62
63 for (int ps = 6; ps <= 35; ps++) {
64 paint.setColor(rand.nextU() | (0xFF << 24));
65 paint.setTextSize(SkIntToScalar(ps));
66 paint.setTextSize(SkIntToScalar(24));
67 canvas->drawText(str, strlen(str), x, y, paint);
68 y += paint.getFontMetrics(nullptr);
69 }
70 }
71
onFindClickHandler(SkScalar x,SkScalar y,unsigned)72 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
73 return new Click(this);
74 }
75
onClick(Click * click)76 bool onClick(Click* click) override {
77 int y = click->fICurr.fY;
78 if (y < 0) {
79 y = 0;
80 } else if (y > 255) {
81 y = 255;
82 }
83 fByte = y;
84 this->inval(nullptr);
85 return true;
86 }
87
88 private:
89 int fByte;
90
91 typedef SampleView INHERITED;
92 };
93
94 //////////////////////////////////////////////////////////////////////////////
95
MyFactory()96 static SkView* MyFactory() { return new TextAlphaView; }
97 static SkViewRegister reg(MyFactory);
98