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 "gm.h"
9 #include "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkShader.h"
12
create_canvas(int w,int h)13 static SkCanvas* create_canvas(int w, int h) {
14 SkBitmap bm;
15 bm.setConfig(SkBitmap::kARGB_8888_Config, w, h);
16 bm.allocPixels();
17 bm.eraseColor(0);
18 return new SkCanvas(bm);
19 }
20
extract_bitmap(SkCanvas * canvas)21 static const SkBitmap& extract_bitmap(SkCanvas* canvas) {
22 return canvas->getDevice()->accessBitmap(false);
23 }
24
25 static const struct {
26 SkXfermode::Mode fMode;
27 const char* fLabel;
28 } gModes[] = {
29 { SkXfermode::kClear_Mode, "Clear" },
30 { SkXfermode::kSrc_Mode, "Src" },
31 { SkXfermode::kDst_Mode, "Dst" },
32 { SkXfermode::kSrcOver_Mode, "SrcOver" },
33 { SkXfermode::kDstOver_Mode, "DstOver" },
34 { SkXfermode::kSrcIn_Mode, "SrcIn" },
35 { SkXfermode::kDstIn_Mode, "DstIn" },
36 { SkXfermode::kSrcOut_Mode, "SrcOut" },
37 { SkXfermode::kDstOut_Mode, "DstOut" },
38 { SkXfermode::kSrcATop_Mode, "SrcATop" },
39 { SkXfermode::kDstATop_Mode, "DstATop" },
40 { SkXfermode::kXor_Mode, "Xor" },
41 };
42
43 const int gWidth = 64;
44 const int gHeight = 64;
45 const SkScalar W = SkIntToScalar(gWidth);
46 const SkScalar H = SkIntToScalar(gHeight);
47
drawCell(SkCanvas * canvas,SkXfermode * mode,SkAlpha a0,SkAlpha a1)48 static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
49
50 SkPaint paint;
51 paint.setAntiAlias(true);
52
53 SkRect r = SkRect::MakeWH(W, H);
54 r.inset(W/10, H/10);
55
56 paint.setColor(SK_ColorBLUE);
57 paint.setAlpha(a0);
58 canvas->drawOval(r, paint);
59
60 paint.setColor(SK_ColorRED);
61 paint.setAlpha(a1);
62 paint.setXfermode(mode);
63 for (int angle = 0; angle < 24; ++angle) {
64 SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
65 SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
66 paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
67 canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
68 }
69
70 return H;
71 }
72
make_bg_shader()73 static SkShader* make_bg_shader() {
74 SkBitmap bm;
75 bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
76 bm.allocPixels();
77 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
78 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 0xCC, 0xCC);
79
80 SkShader* s = SkShader::CreateBitmapShader(bm,
81 SkShader::kRepeat_TileMode,
82 SkShader::kRepeat_TileMode);
83
84 SkMatrix m;
85 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
86 s->setLocalMatrix(m);
87 return s;
88 }
89
90 namespace skiagm {
91
92 class HairModesGM : public GM {
93 SkPaint fBGPaint;
94 public:
HairModesGM()95 HairModesGM() {
96 fBGPaint.setShader(make_bg_shader())->unref();
97 }
98
99 protected:
100
onShortName()101 virtual SkString onShortName() {
102 return SkString("hairmodes");
103 }
104
onISize()105 virtual SkISize onISize() { return make_isize(640, 480); }
106
onDraw(SkCanvas * canvas)107 virtual void onDraw(SkCanvas* canvas) {
108 const SkRect bounds = SkRect::MakeWH(W, H);
109 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
110
111 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
112
113 for (int alpha = 0; alpha < 4; ++alpha) {
114 canvas->save();
115 canvas->save();
116 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
117 if (6 == i) {
118 canvas->restore();
119 canvas->translate(W * 5, 0);
120 canvas->save();
121 }
122 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
123
124 canvas->drawRect(bounds, fBGPaint);
125 canvas->saveLayer(&bounds, NULL);
126 SkScalar dy = drawCell(canvas, mode,
127 gAlphaValue[alpha & 1],
128 gAlphaValue[alpha & 2]);
129 canvas->restore();
130
131 canvas->translate(0, dy * 5 / 4);
132 SkSafeUnref(mode);
133 }
134 canvas->restore();
135 canvas->restore();
136 canvas->translate(W * 5 / 4, 0);
137 }
138 }
139
140 // disable pdf for now, since it crashes on mac
onGetFlags() const141 virtual uint32_t onGetFlags() const { return kSkipPDF_Flag; }
142
143 private:
144 typedef GM INHERITED;
145 };
146
147 //////////////////////////////////////////////////////////////////////////////
148
MyFactory(void *)149 static GM* MyFactory(void*) { return new HairModesGM; }
150 static GMRegistry reg(MyFactory);
151
152 }
153