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
check_for_nonwhite(const SkBitmap & bm,int alpha)29 static 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
45 class TextAlphaView : public SampleView {
46 public:
TextAlphaView()47 TextAlphaView() {
48 fByte = 0xFF;
49 }
50
51 protected:
52 // overrides from SkEventSink
onQuery(SkEvent * evt)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
onDrawContent(SkCanvas * canvas)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
onFindClickHandler(SkScalar x,SkScalar y)95 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
96 return new Click(this);
97 }
98
onClick(Click * click)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
111 private:
112 int fByte;
113
114 typedef SampleView INHERITED;
115 };
116
117 //////////////////////////////////////////////////////////////////////////////
118
MyFactory()119 static SkView* MyFactory() { return new TextAlphaView; }
120 static SkViewRegister reg(MyFactory);
121
122