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
test4(SkCanvas * canvas)13 static void test4(SkCanvas* canvas) {
14 SkPaint paint;
15 paint.setAntiAlias(true);
16 SkPoint pts[] = {
17 {10, 160}, {610, 160},
18 {610, 160}, {10, 160},
19
20 {610, 160}, {610, 160},
21 {610, 199}, {610, 199},
22
23 {10, 198}, {610, 198},
24 {610, 199}, {10, 199},
25
26 {10, 160}, {10, 160},
27 {10, 199}, {10, 199}
28 };
29 char verbs[] = {
30 0, 1, 1, 1, 4,
31 0, 1, 1, 1, 4,
32 0, 1, 1, 1, 4,
33 0, 1, 1, 1, 4
34 };
35 SkPath path;
36 SkPoint* ptPtr = pts;
37 for (size_t i = 0; i < sizeof(verbs); ++i) {
38 switch ((SkPath::Verb) verbs[i]) {
39 case SkPath::kMove_Verb:
40 path.moveTo(ptPtr->fX, ptPtr->fY);
41 ++ptPtr;
42 break;
43 case SkPath::kLine_Verb:
44 path.lineTo(ptPtr->fX, ptPtr->fY);
45 ++ptPtr;
46 break;
47 case SkPath::kClose_Verb:
48 path.close();
49 break;
50 default:
51 SkASSERT(false);
52 break;
53 }
54 }
55 SkRect clip = {0, 130, 772, 531};
56 canvas->clipRect(clip);
57 canvas->drawPath(path, paint);
58 }
59
60 static const struct {
61 SkXfermode::Mode fMode;
62 const char* fLabel;
63 } gModes[] = {
64 { SkXfermode::kClear_Mode, "Clear" },
65 { SkXfermode::kSrc_Mode, "Src" },
66 { SkXfermode::kDst_Mode, "Dst" },
67 { SkXfermode::kSrcOver_Mode, "SrcOver" },
68 { SkXfermode::kDstOver_Mode, "DstOver" },
69 { SkXfermode::kSrcIn_Mode, "SrcIn" },
70 { SkXfermode::kDstIn_Mode, "DstIn" },
71 { SkXfermode::kSrcOut_Mode, "SrcOut" },
72 { SkXfermode::kDstOut_Mode, "DstOut" },
73 { SkXfermode::kSrcATop_Mode, "SrcATop" },
74 { SkXfermode::kDstATop_Mode, "DstATop" },
75 { SkXfermode::kXor_Mode, "Xor" },
76 };
77
78 const int gWidth = 64;
79 const int gHeight = 64;
80 const SkScalar W = SkIntToScalar(gWidth);
81 const SkScalar H = SkIntToScalar(gHeight);
82
drawCell(SkCanvas * canvas,SkXfermode * mode,SkAlpha a0,SkAlpha a1)83 static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode,
84 SkAlpha a0, SkAlpha a1) {
85
86 SkPaint paint;
87 paint.setAntiAlias(true);
88
89 SkRect r = SkRect::MakeWH(W, H);
90 r.inset(W/10, H/10);
91
92 paint.setColor(SK_ColorBLUE);
93 paint.setAlpha(a0);
94 canvas->drawOval(r, paint);
95
96 paint.setColor(SK_ColorRED);
97 paint.setAlpha(a1);
98 paint.setXfermode(mode);
99
100 SkScalar offset = SK_Scalar1 / 3;
101 SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
102 H / 4 + offset,
103 W / 2, H / 2);
104 canvas->drawRect(rect, paint);
105
106 return H;
107 }
108
make_bg_shader()109 static SkShader* make_bg_shader() {
110 SkBitmap bm;
111 bm.allocN32Pixels(2, 2);
112 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
113 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC,
114 0xCC, 0xCC);
115
116 const SkMatrix m = SkMatrix::MakeScale(SkIntToScalar(6), SkIntToScalar(6));
117 SkShader* s = SkShader::CreateBitmapShader(bm,
118 SkShader::kRepeat_TileMode,
119 SkShader::kRepeat_TileMode,
120 &m);
121
122 return s;
123 }
124
125 namespace skiagm {
126
127 class AARectModesGM : public GM {
128 SkPaint fBGPaint;
129 public:
AARectModesGM()130 AARectModesGM () {
131 fBGPaint.setShader(make_bg_shader())->unref();
132 }
133
134 protected:
135
onShortName()136 SkString onShortName() override {
137 return SkString("aarectmodes");
138 }
139
onISize()140 SkISize onISize() override { return SkISize::Make(640, 480); }
141
onDraw(SkCanvas * canvas)142 void onDraw(SkCanvas* canvas) override {
143 if (false) { // avoid bit rot, suppress warning
144 test4(canvas);
145 }
146 const SkRect bounds = SkRect::MakeWH(W, H);
147 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
148
149 canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
150
151 for (int alpha = 0; alpha < 4; ++alpha) {
152 canvas->save();
153 canvas->save();
154 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
155 if (6 == i) {
156 canvas->restore();
157 canvas->translate(W * 5, 0);
158 canvas->save();
159 }
160 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
161
162 canvas->drawRect(bounds, fBGPaint);
163 canvas->saveLayer(&bounds, NULL);
164 SkScalar dy = drawCell(canvas, mode,
165 gAlphaValue[alpha & 1],
166 gAlphaValue[alpha & 2]);
167 canvas->restore();
168
169 canvas->translate(0, dy * 5 / 4);
170 SkSafeUnref(mode);
171 }
172 canvas->restore();
173 canvas->restore();
174 canvas->translate(W * 5 / 4, 0);
175 }
176 }
177
178 private:
179 typedef GM INHERITED;
180 };
181
182 //////////////////////////////////////////////////////////////////////////////
183
MyFactory(void *)184 static GM* MyFactory(void*) { return new AARectModesGM; }
185 static GMRegistry reg(MyFactory);
186
187 }
188