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
15 static const struct {
16 SkXfermode::Mode fMode;
17 const char* fLabel;
18 } gModes[] = {
19 { SkXfermode::kClear_Mode, "Clear" },
20 { SkXfermode::kSrc_Mode, "Src" },
21 { SkXfermode::kDst_Mode, "Dst" },
22 { SkXfermode::kSrcOver_Mode, "SrcOver" },
23 { SkXfermode::kDstOver_Mode, "DstOver" },
24 { SkXfermode::kSrcIn_Mode, "SrcIn" },
25 { SkXfermode::kDstIn_Mode, "DstIn" },
26 { SkXfermode::kSrcOut_Mode, "SrcOut" },
27 { SkXfermode::kDstOut_Mode, "DstOut" },
28 { SkXfermode::kSrcATop_Mode, "SrcATop" },
29 { SkXfermode::kDstATop_Mode, "DstATop" },
30 { SkXfermode::kXor_Mode, "Xor" },
31 };
32
33 const int gWidth = 64;
34 const int gHeight = 64;
35 const SkScalar W = SkIntToScalar(gWidth);
36 const SkScalar H = SkIntToScalar(gHeight);
37
drawCell(SkCanvas * canvas,SkXfermode * mode,SkAlpha a0,SkAlpha a1)38 static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode,
39 SkAlpha a0, SkAlpha a1) {
40
41 SkPaint paint;
42 paint.setAntiAlias(true);
43
44 SkRect r = SkRect::MakeWH(W, H);
45 r.inset(W/10, H/10);
46
47 paint.setColor(SK_ColorBLUE);
48 paint.setAlpha(a0);
49 canvas->drawOval(r, paint);
50
51 paint.setColor(SK_ColorRED);
52 paint.setAlpha(a1);
53 paint.setXfermode(mode);
54
55 SkScalar offset = SK_Scalar1 / 3;
56 SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
57 H / 4 + offset,
58 W / 2, H / 2);
59 canvas->drawRect(rect, paint);
60
61 return H;
62 }
63
make_bg_shader()64 static SkShader* make_bg_shader() {
65 SkBitmap bm;
66 bm.allocN32Pixels(2, 2);
67 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
68 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC,
69 0xCC, 0xCC);
70
71 SkMatrix m;
72 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
73
74 return SkShader::CreateBitmapShader(bm,
75 SkShader::kRepeat_TileMode,
76 SkShader::kRepeat_TileMode,
77 &m);
78 }
79
80 class AARectsModesView : public SampleView {
81 SkPaint fBGPaint;
82 public:
AARectsModesView()83 AARectsModesView () {
84 fBGPaint.setShader(make_bg_shader())->unref();
85 }
86
87 protected:
88 // overrides from SkEventSink
onQuery(SkEvent * evt)89 virtual bool onQuery(SkEvent* evt) {
90 if (SampleCode::TitleQ(*evt)) {
91 SampleCode::TitleR(evt, "AARectsModes");
92 return true;
93 }
94 return this->INHERITED::onQuery(evt);
95 }
96
onDrawContent(SkCanvas * canvas)97 virtual void onDrawContent(SkCanvas* canvas) {
98 const SkRect bounds = SkRect::MakeWH(W, H);
99 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
100
101 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
102
103 for (int alpha = 0; alpha < 4; ++alpha) {
104 canvas->save();
105 canvas->save();
106 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
107 if (6 == i) {
108 canvas->restore();
109 canvas->translate(W * 5, 0);
110 canvas->save();
111 }
112 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
113
114 canvas->drawRect(bounds, fBGPaint);
115 canvas->saveLayer(&bounds, NULL);
116 SkScalar dy = drawCell(canvas, mode,
117 gAlphaValue[alpha & 1],
118 gAlphaValue[alpha & 2]);
119 canvas->restore();
120
121 canvas->translate(0, dy * 5 / 4);
122 SkSafeUnref(mode);
123 }
124 canvas->restore();
125 canvas->restore();
126 canvas->translate(W * 5 / 4, 0);
127 }
128 }
129
130 private:
131 typedef SampleView INHERITED;
132 };
133
134 ///////////////////////////////////////////////////////////////////////////////
135
MyFactory()136 static SkView* MyFactory() { return new AARectsModesView; }
137 static SkViewRegister reg(MyFactory);
138