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reed@google.com1ec27a02011-09-08 13:36:30 +00001/*
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
reed@google.com1ec27a02011-09-08 13:36:30 +000015static 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
33const int gWidth = 64;
34const int gHeight = 64;
35const SkScalar W = SkIntToScalar(gWidth);
36const SkScalar H = SkIntToScalar(gHeight);
37
38static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
39
40 SkPaint paint;
41 paint.setAntiAlias(true);
42
43 SkRect r = SkRect::MakeWH(W, H);
44 r.inset(W/10, H/10);
45
46 paint.setColor(SK_ColorBLUE);
47 paint.setAlpha(a0);
48 canvas->drawOval(r, paint);
49
50 paint.setColor(SK_ColorRED);
51 paint.setAlpha(a1);
52 paint.setXfermode(mode);
53 for (int angle = 0; angle < 24; ++angle) {
54 SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
55 SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
56 paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
57 canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
58 }
rmistry@google.comae933ce2012-08-23 18:19:56 +000059
reed@google.com1ec27a02011-09-08 13:36:30 +000060 return H;
61}
62
63static SkShader* make_bg_shader() {
64 SkBitmap bm;
65 bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
66 bm.allocPixels();
67 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
68 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 0xCC, 0xCC);
69
70 SkShader* s = SkShader::CreateBitmapShader(bm,
71 SkShader::kRepeat_TileMode,
72 SkShader::kRepeat_TileMode);
rmistry@google.comae933ce2012-08-23 18:19:56 +000073
reed@google.com1ec27a02011-09-08 13:36:30 +000074 SkMatrix m;
75 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
76 s->setLocalMatrix(m);
77 return s;
78}
79
80class HairModesView : public SampleView {
81 SkPaint fBGPaint;
82public:
rmistry@google.comae933ce2012-08-23 18:19:56 +000083 HairModesView() {
reed@google.com1ec27a02011-09-08 13:36:30 +000084 fBGPaint.setShader(make_bg_shader())->unref();
85 }
86
87protected:
88 // overrides from SkEventSink
89 virtual bool onQuery(SkEvent* evt) {
90 if (SampleCode::TitleQ(*evt)) {
91 SampleCode::TitleR(evt, "HairlineModes");
92 return true;
93 }
94 return this->INHERITED::onQuery(evt);
95 }
96
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);
rmistry@google.comae933ce2012-08-23 18:19:56 +0000113
reed@google.com1ec27a02011-09-08 13:36:30 +0000114 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 }
rmistry@google.comae933ce2012-08-23 18:19:56 +0000129
reed@google.com1ec27a02011-09-08 13:36:30 +0000130private:
131 typedef SampleView INHERITED;
132};
133
134///////////////////////////////////////////////////////////////////////////////
135
136static SkView* MyFactory() { return new HairModesView; }
137static SkViewRegister reg(MyFactory);