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
13 static const struct {
14 SkXfermode::Mode fMode;
15 const char* fLabel;
16 } gModes[] = {
17 { SkXfermode::kClear_Mode, "Clear" },
18 { SkXfermode::kSrc_Mode, "Src" },
19 { SkXfermode::kDst_Mode, "Dst" },
20 { SkXfermode::kSrcOver_Mode, "SrcOver" },
21 { SkXfermode::kDstOver_Mode, "DstOver" },
22 { SkXfermode::kSrcIn_Mode, "SrcIn" },
23 { SkXfermode::kDstIn_Mode, "DstIn" },
24 { SkXfermode::kSrcOut_Mode, "SrcOut" },
25 { SkXfermode::kDstOut_Mode, "DstOut" },
26 { SkXfermode::kSrcATop_Mode, "SrcATop" },
27 { SkXfermode::kDstATop_Mode, "DstATop" },
28 { SkXfermode::kXor_Mode, "Xor" },
29 };
30
31 const int gWidth = 64;
32 const int gHeight = 64;
33 const SkScalar W = SkIntToScalar(gWidth);
34 const SkScalar H = SkIntToScalar(gHeight);
35
drawCell(SkCanvas * canvas,SkXfermode * mode,SkAlpha a0,SkAlpha a1)36 static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, SkAlpha a0, SkAlpha a1) {
37
38 SkPaint paint;
39 paint.setAntiAlias(true);
40
41 SkRect r = SkRect::MakeWH(W, H);
42 r.inset(W/10, H/10);
43
44 paint.setColor(SK_ColorBLUE);
45 paint.setAlpha(a0);
46 canvas->drawOval(r, paint);
47
48 paint.setColor(SK_ColorRED);
49 paint.setAlpha(a1);
50 paint.setXfermode(mode);
51 for (int angle = 0; angle < 24; ++angle) {
52 SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
53 SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
54 paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
55 canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
56 }
57
58 return H;
59 }
60
make_bg_shader()61 static SkShader* make_bg_shader() {
62 SkBitmap bm;
63 bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
64 bm.allocPixels();
65 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
66 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 0xCC, 0xCC);
67
68 SkShader* s = SkShader::CreateBitmapShader(bm,
69 SkShader::kRepeat_TileMode,
70 SkShader::kRepeat_TileMode);
71
72 SkMatrix m;
73 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
74 s->setLocalMatrix(m);
75 return s;
76 }
77
78 namespace skiagm {
79
80 class HairModesGM : public GM {
81 SkPaint fBGPaint;
82
83 protected:
84
onShortName()85 virtual SkString onShortName() SK_OVERRIDE {
86 return SkString("hairmodes");
87 }
88
onISize()89 virtual SkISize onISize() { return make_isize(640, 480); }
90
onOnceBeforeDraw()91 virtual void onOnceBeforeDraw() SK_OVERRIDE {
92 fBGPaint.setShader(make_bg_shader())->unref();
93 }
94
onDraw(SkCanvas * canvas)95 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
96 const SkRect bounds = SkRect::MakeWH(W, H);
97 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
98
99 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
100
101 for (int alpha = 0; alpha < 4; ++alpha) {
102 canvas->save();
103 canvas->save();
104 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
105 if (6 == i) {
106 canvas->restore();
107 canvas->translate(W * 5, 0);
108 canvas->save();
109 }
110 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
111
112 canvas->drawRect(bounds, fBGPaint);
113 canvas->saveLayer(&bounds, NULL);
114 SkScalar dy = drawCell(canvas, mode,
115 gAlphaValue[alpha & 1],
116 gAlphaValue[alpha & 2]);
117 canvas->restore();
118
119 canvas->translate(0, dy * 5 / 4);
120 SkSafeUnref(mode);
121 }
122 canvas->restore();
123 canvas->restore();
124 canvas->translate(W * 5 / 4, 0);
125 }
126 }
127
128 // disable pdf for now, since it crashes on mac
onGetFlags() const129 virtual uint32_t onGetFlags() const { return kSkipPDF_Flag; }
130
131 private:
132 typedef GM INHERITED;
133 };
134
135 //////////////////////////////////////////////////////////////////////////////
136
MyFactory(void *)137 static GM* MyFactory(void*) { return new HairModesGM; }
138 static GMRegistry reg(MyFactory);
139
140 }
141