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 "SkCanvas.h"
11 #include "SkGradientShader.h"
12 #include "SkGraphics.h"
13 #include "SkImageDecoder.h"
14 #include "SkPath.h"
15 #include "SkRegion.h"
16 #include "SkShader.h"
17 #include "SkUtils.h"
18 #include "SkXfermode.h"
19 #include "SkColorPriv.h"
20 #include "SkColorFilter.h"
21 #include "SkTime.h"
22 #include "SkTypeface.h"
23
make_bitmapfade(const SkBitmap & bm)24 static SkShader* make_bitmapfade(const SkBitmap& bm)
25 {
26 SkPoint pts[2];
27 SkColor colors[2];
28
29 pts[0].set(0, 0);
30 pts[1].set(0, SkIntToScalar(bm.height()));
31 colors[0] = SK_ColorBLACK;
32 colors[1] = SkColorSetARGB(0, 0, 0, 0);
33 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
34
35 SkShader* shaderB = SkShader::CreateBitmapShader(bm,
36 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
37
38 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
39
40 SkShader* shader = SkShader::CreateComposeShader(shaderB, shaderA, mode);
41 shaderA->unref();
42 shaderB->unref();
43 mode->unref();
44
45 return shader;
46 }
47
48 class ShaderView : public SampleView {
49 public:
50 SkShader* fShader;
51 SkBitmap fBitmap;
52
ShaderView()53 ShaderView() {
54 SkImageDecoder::DecodeFile("/skimages/logo.gif", &fBitmap);
55
56 SkPoint pts[2];
57 SkColor colors[2];
58
59 pts[0].set(0, 0);
60 pts[1].set(SkIntToScalar(100), 0);
61 colors[0] = SK_ColorRED;
62 colors[1] = SK_ColorBLUE;
63 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
64
65 pts[0].set(0, 0);
66 pts[1].set(0, SkIntToScalar(100));
67 colors[0] = SK_ColorBLACK;
68 colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
69 SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
70
71 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
72
73 fShader = SkShader::CreateComposeShader(shaderA, shaderB, mode);
74 shaderA->unref();
75 shaderB->unref();
76 mode->unref();
77 }
~ShaderView()78 virtual ~ShaderView() {
79 SkSafeUnref(fShader);
80 }
81
82 protected:
83 // overrides from SkEventSink
onQuery(SkEvent * evt)84 bool onQuery(SkEvent* evt) override {
85 if (SampleCode::TitleQ(*evt)) {
86 SampleCode::TitleR(evt, "Shaders");
87 return true;
88 }
89 return this->INHERITED::onQuery(evt);
90 }
91
onDrawContent(SkCanvas * canvas)92 void onDrawContent(SkCanvas* canvas) override {
93 canvas->drawBitmap(fBitmap, 0, 0);
94
95 canvas->translate(SkIntToScalar(20), SkIntToScalar(120));
96
97 SkPaint paint;
98 SkRect r;
99
100 paint.setColor(SK_ColorGREEN);
101 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
102 paint.setShader(fShader);
103 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
104
105 canvas->translate(SkIntToScalar(110), 0);
106
107 int w = fBitmap.width();
108 int h = fBitmap.height();
109 w = 120;
110 h = 80;
111 r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h));
112
113 paint.setShader(nullptr);
114 canvas->drawRect(r, paint);
115 paint.setShader(make_bitmapfade(fBitmap))->unref();
116 canvas->drawRect(r, paint);
117 }
118
onFindClickHandler(SkScalar x,SkScalar y,unsigned modi)119 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
120 this->inval(nullptr);
121 return this->INHERITED::onFindClickHandler(x, y, modi);
122 }
123
onClick(Click * click)124 bool onClick(Click* click) override {
125 return this->INHERITED::onClick(click);
126 }
127
128 private:
129 typedef SampleView INHERITED;
130 };
131
132 //////////////////////////////////////////////////////////////////////////////
133
MyFactory()134 static SkView* MyFactory() { return new ShaderView; }
135 static SkViewRegister reg(MyFactory);
136
