1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkColorPriv.h"
13 #include "SkShader.h"
14
create_canvas(int w,int h)15 static SkCanvas* create_canvas(int w, int h) {
16 SkBitmap bm;
17 bm.setConfig(SkBitmap::kARGB_8888_Config, w, h);
18 bm.allocPixels();
19 bm.eraseColor(0);
20 return new SkCanvas(bm);
21 }
22
extract_bitmap(SkCanvas * canvas)23 static const SkBitmap& extract_bitmap(SkCanvas* canvas) {
24 return canvas->getDevice()->accessBitmap(false);
25 }
26
27 static const struct {
28 SkXfermode::Mode fMode;
29 const char* fLabel;
30 } gModes[] = {
31 { SkXfermode::kClear_Mode, "Clear" },
32 { SkXfermode::kSrc_Mode, "Src" },
33 { SkXfermode::kDst_Mode, "Dst" },
34 { SkXfermode::kSrcOver_Mode, "SrcOver" },
35 { SkXfermode::kDstOver_Mode, "DstOver" },
36 { SkXfermode::kSrcIn_Mode, "SrcIn" },
37 { SkXfermode::kDstIn_Mode, "DstIn" },
38 { SkXfermode::kSrcOut_Mode, "SrcOut" },
39 { SkXfermode::kDstOut_Mode, "DstOut" },
40 { SkXfermode::kSrcATop_Mode, "SrcATop" },
41 { SkXfermode::kDstATop_Mode, "DstATop" },
42 { SkXfermode::kXor_Mode, "Xor" },
43 };
44
45 const int gWidth = 64;
46 const int gHeight = 64;
47 const SkScalar W = SkIntToScalar(gWidth);
48 const SkScalar H = SkIntToScalar(gHeight);
49
drawCell(SkCanvas * canvas,SkXfermode * mode,SkAlpha a0,SkAlpha a1)50 static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode,
51 SkAlpha a0, SkAlpha a1) {
52
53 SkPaint paint;
54 paint.setAntiAlias(true);
55
56 SkRect r = SkRect::MakeWH(W, H);
57 r.inset(W/10, H/10);
58
59 paint.setColor(SK_ColorBLUE);
60 paint.setAlpha(a0);
61 canvas->drawOval(r, paint);
62
63 paint.setColor(SK_ColorRED);
64 paint.setAlpha(a1);
65 paint.setXfermode(mode);
66
67 SkScalar offset = SK_Scalar1 / 3;
68 SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
69 H / 4 + offset,
70 W / 2, H / 2);
71 canvas->drawRect(rect, paint);
72
73 return H;
74 }
75
make_bg_shader()76 static SkShader* make_bg_shader() {
77 SkBitmap bm;
78 bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
79 bm.allocPixels();
80 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
81 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC,
82 0xCC, 0xCC);
83
84 SkShader* s = SkShader::CreateBitmapShader(bm,
85 SkShader::kRepeat_TileMode,
86 SkShader::kRepeat_TileMode);
87
88 SkMatrix m;
89 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
90 s->setLocalMatrix(m);
91 return s;
92 }
93
94 class AARectsModesView : public SampleView {
95 SkPaint fBGPaint;
96 public:
AARectsModesView()97 AARectsModesView () {
98 fBGPaint.setShader(make_bg_shader())->unref();
99 }
100
101 protected:
102 // overrides from SkEventSink
onQuery(SkEvent * evt)103 virtual bool onQuery(SkEvent* evt) {
104 if (SampleCode::TitleQ(*evt)) {
105 SampleCode::TitleR(evt, "AARectsModes");
106 return true;
107 }
108 return this->INHERITED::onQuery(evt);
109 }
110
onDrawContent(SkCanvas * canvas)111 virtual void onDrawContent(SkCanvas* canvas) {
112 const SkRect bounds = SkRect::MakeWH(W, H);
113 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
114
115 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
116
117 for (int alpha = 0; alpha < 4; ++alpha) {
118 canvas->save();
119 canvas->save();
120 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
121 if (6 == i) {
122 canvas->restore();
123 canvas->translate(W * 5, 0);
124 canvas->save();
125 }
126 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
127
128 canvas->drawRect(bounds, fBGPaint);
129 canvas->saveLayer(&bounds, NULL);
130 SkScalar dy = drawCell(canvas, mode,
131 gAlphaValue[alpha & 1],
132 gAlphaValue[alpha & 2]);
133 canvas->restore();
134
135 canvas->translate(0, dy * 5 / 4);
136 SkSafeUnref(mode);
137 }
138 canvas->restore();
139 canvas->restore();
140 canvas->translate(W * 5 / 4, 0);
141 }
142 }
143
144 private:
145 typedef SampleView INHERITED;
146 };
147
148 ///////////////////////////////////////////////////////////////////////////////
149
MyFactory()150 static SkView* MyFactory() { return new AARectsModesView; }
151 static SkViewRegister reg(MyFactory);
152
153