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
check_for_nonwhite(const SkBitmap & bm,int alpha)31 static void check_for_nonwhite(const SkBitmap& bm, int alpha) {
32 if (bm.colorType() != kRGB_565_SkColorType) {
33 return;
34 }
35
36 for (int y = 0; y < bm.height(); y++) {
37 for (int x = 0; x < bm.width(); x++) {
38 uint16_t c = *bm.getAddr16(x, y);
39 if (c != 0xFFFF) {
40 SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c);
41 return;
42 }
43 }
44 }
45 }
46
47 class TextAlphaView : public SampleView {
48 public:
TextAlphaView()49 TextAlphaView() {
50 fByte = 0xFF;
51 }
52
53 protected:
54 // overrides from SkEventSink
onQuery(SkEvent * evt)55 virtual bool onQuery(SkEvent* evt) {
56 if (SampleCode::TitleQ(*evt)) {
57 SampleCode::TitleR(evt, "TextAlpha");
58 return true;
59 }
60 return this->INHERITED::onQuery(evt);
61 }
62
onDrawContent(SkCanvas * canvas)63 virtual void onDrawContent(SkCanvas* canvas) {
64 const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
65 SkPaint paint;
66 SkScalar x = SkIntToScalar(10);
67 SkScalar y = SkIntToScalar(20);
68
69 paint.setFlags(0x105);
70
71 paint.setARGB(fByte, 0xFF, 0xFF, 0xFF);
72
73 paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
74 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
75 paint.getMaskFilter()->unref();
76
77 SkRandom rand;
78
79 for (int ps = 6; ps <= 35; ps++) {
80 paint.setColor(rand.nextU() | (0xFF << 24));
81 paint.setTextSize(SkIntToScalar(ps));
82 paint.setTextSize(SkIntToScalar(24));
83 canvas->drawText(str, strlen(str), x, y, paint);
84 y += paint.getFontMetrics(NULL);
85 }
86 if (false) { // avoid bit rot, suppress warning
87 check_for_nonwhite(canvas->getDevice()->accessBitmap(false), fByte);
88 SkDebugf("------ byte %x\n", fByte);
89 }
90
91 if (false) {
92 fByte += 1;
93 fByte &= 0xFF;
94 this->inval(NULL);
95 }
96 }
97
onFindClickHandler(SkScalar x,SkScalar y,unsigned)98 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) SK_OVERRIDE {
99 return new Click(this);
100 }
101
onClick(Click * click)102 virtual bool onClick(Click* click) {
103 int y = click->fICurr.fY;
104 if (y < 0) {
105 y = 0;
106 } else if (y > 255) {
107 y = 255;
108 }
109 fByte = y;
110 this->inval(NULL);
111 return true;
112 }
113
114 private:
115 int fByte;
116
117 typedef SampleView INHERITED;
118 };
119
120 //////////////////////////////////////////////////////////////////////////////
121
MyFactory()122 static SkView* MyFactory() { return new TextAlphaView; }
123 static SkViewRegister reg(MyFactory);
124