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Side by Side Diff: gm/conicpaths.cpp

Issue 17365006: Add GM to test conic path rendering (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 7 years, 6 months ago
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1 /*
2 * Copyright 2013 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 "SkTArray.h"
11
12 namespace skiagm {
13
14 class ConicPathsGM : public GM {
15 protected:
16
17 virtual SkString onShortName() SK_OVERRIDE {
18 return SkString("conicpaths");
19 }
20
21 virtual SkISize onISize() SK_OVERRIDE {
22 return SkISize::Make(800, 600);
23 }
24
25 virtual void onOnceBeforeDraw() SK_OVERRIDE {
26 {
27 SkPath* conicCirlce = &fPaths.push_back();
28 conicCirlce->moveTo(0, -0);
29 conicCirlce->conicTo(SkIntToScalar(0), SkIntToScalar(50),
30 SkIntToScalar(50), SkIntToScalar(50),
31 SkScalarHalf(SkScalarSqrt(2)));
32 conicCirlce->rConicTo(SkIntToScalar(50), SkIntToScalar(0),
33 SkIntToScalar(50), SkIntToScalar(-50),
34 SkScalarHalf(SkScalarSqrt(2)));
35 conicCirlce->rConicTo(SkIntToScalar(0), SkIntToScalar(-50),
36 SkIntToScalar(-50), SkIntToScalar(-50),
37 SkScalarHalf(SkScalarSqrt(2)));
38 conicCirlce->rConicTo(SkIntToScalar(-50), SkIntToScalar(0),
39 SkIntToScalar(-50), SkIntToScalar(50),
40 SkScalarHalf(SkScalarSqrt(2)));
41
42 }
43 {
44 SkPath* hyperbola = &fPaths.push_back();
45 hyperbola->moveTo(0, -0);
46 hyperbola->conicTo(SkIntToScalar(0), SkIntToScalar(100),
47 SkIntToScalar(100), SkIntToScalar(100),
48 SkIntToScalar(2));
49 }
50 {
51 SkPath* thinHyperbola = &fPaths.push_back();
52 thinHyperbola->moveTo(0, -0);
53 thinHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
54 SkIntToScalar(5), SkIntToScalar(0),
55 SkIntToScalar(2));
56 }
57 {
58 SkPath* veryThinHyperbola = &fPaths.push_back();
59 veryThinHyperbola->moveTo(0, -0);
60 veryThinHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
61 SkIntToScalar(1), SkIntToScalar(0),
62 SkIntToScalar(2));
63 }
64 {
65 SkPath* closedHyperbola = &fPaths.push_back();
66 closedHyperbola->moveTo(0, -0);
67 closedHyperbola->conicTo(SkIntToScalar(100), SkIntToScalar(100),
68 SkIntToScalar(0), SkIntToScalar(0),
69 SkIntToScalar(2));
70 }
71 {
72 // using 1 as weight defaults to using quadTo
73 SkPath* nearParabola = &fPaths.push_back();
74 nearParabola->moveTo(0, -0);
75 nearParabola->conicTo(SkIntToScalar(0), SkIntToScalar(100),
76 SkIntToScalar(100), SkIntToScalar(100),
77 0.999);
78 }
79 {
80 SkPath* thinEllipse = &fPaths.push_back();
81 thinEllipse->moveTo(0, -0);
82 thinEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
83 SkIntToScalar(5), SkIntToScalar(0),
84 SK_ScalarHalf);
85 }
86 {
87 SkPath* veryThinEllipse = &fPaths.push_back();
88 veryThinEllipse->moveTo(0, -0);
89 veryThinEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
90 SkIntToScalar(1), SkIntToScalar(0),
91 SK_ScalarHalf);
92 }
93 {
94 SkPath* closedEllipse = &fPaths.push_back();
95 closedEllipse->moveTo(0, -0);
96 closedEllipse->conicTo(SkIntToScalar(100), SkIntToScalar(100),
97 SkIntToScalar(0), SkIntToScalar(0),
98 SK_ScalarHalf);
99 }
100 }
101
102 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
103 static const SkAlpha kAlphaValue[] = { 0xFF, 0x40 };
104
105 enum {
106 kMargin = 15,
107 };
108 int wrapX = canvas->getDeviceSize().fWidth - kMargin;
109
110 SkScalar maxH = 0;
111 canvas->translate(SkIntToScalar(kMargin), SkIntToScalar(kMargin));
112 canvas->save();
113
114 SkScalar x = SkIntToScalar(kMargin);
115 for (int p = 0; p < fPaths.count(); ++p) {
116 for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphaValue); ++a) {
117 for (int aa = 0; aa < 2; ++aa) {
118 for (int fh = 0; fh < 2; ++fh) {
119
120 const SkRect& bounds = fPaths[p].getBounds();
121
122 if (x + bounds.width() > wrapX) {
123 canvas->restore();
124 canvas->translate(0, maxH + SkIntToScalar(kMargin));
125 canvas->save();
126 maxH = 0;
127 x = SkIntToScalar(kMargin);
128 }
129
130 SkPaint paint;
131 paint.setARGB(kAlphaValue[a], 0, 0, 0);
132 paint.setAntiAlias(SkToBool(aa));
133 if (fh == 1) {
134 paint.setStyle(SkPaint::kStroke_Style);
135 paint.setStrokeWidth(0);
136 } else if (fh == 0) {
137 paint.setStyle(SkPaint::kFill_Style);
138 }
139 canvas->save();
140 canvas->translate(-bounds.fLeft, -bounds.fTop);
141 canvas->drawPath(fPaths[p], paint);
142 canvas->restore();
143
144 maxH = SkMaxScalar(maxH, bounds.height());
145
146 SkScalar dx = bounds.width() + SkIntToScalar(kMargin);
147 x += dx;
148 canvas->translate(dx, 0);
149 }
150 }
151 }
152 }
153 canvas->restore();
154 }
155
156 private:
157 SkTArray<SkPath> fPaths;
158 typedef GM INHERITED;
159 };
160
161 //////////////////////////////////////////////////////////////////////////////
162
163 DEF_GM( return SkNEW(ConicPathsGM); )
164 }
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