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