1 /*
2  * Copyright 2017 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 #include "Test.h"
8 #include "SkPolyUtils.h"
9 
DEF_TEST(OffsetSimplePoly,reporter)10 DEF_TEST(OffsetSimplePoly, reporter) {
11     SkTDArray<SkPoint> rrectPoly;
12 
13     ///////////////////////////////////////////////////////////////////////
14     // Try convex tests first
15 
16     // round rect
17     *rrectPoly.push() = SkPoint::Make(-100, 55);
18     *rrectPoly.push() = SkPoint::Make(100, 55);
19     *rrectPoly.push() = SkPoint::Make(100 + 2.5f, 50 + 4.330127f);
20     *rrectPoly.push() = SkPoint::Make(100 + 3.535534f, 50 + 3.535534f);
21     *rrectPoly.push() = SkPoint::Make(100 + 4.330127f, 50 + 2.5f);
22     *rrectPoly.push() = SkPoint::Make(105, 50);
23     *rrectPoly.push() = SkPoint::Make(105, -50);
24     *rrectPoly.push() = SkPoint::Make(100 + 4.330127f, -50 - 2.5f);
25     *rrectPoly.push() = SkPoint::Make(100 + 3.535534f, -50 - 3.535534f);
26     *rrectPoly.push() = SkPoint::Make(100 + 2.5f, -50 - 4.330127f);
27     *rrectPoly.push() = SkPoint::Make(100, -55);
28     *rrectPoly.push() = SkPoint::Make(-100, -55);
29     *rrectPoly.push() = SkPoint::Make(-100 - 2.5f, -50 - 4.330127f);
30     *rrectPoly.push() = SkPoint::Make(-100 - 3.535534f, -50 - 3.535534f);
31     *rrectPoly.push() = SkPoint::Make(-100 - 4.330127f, -50 - 2.5f);
32     *rrectPoly.push() = SkPoint::Make(-105, -50);
33     *rrectPoly.push() = SkPoint::Make(-105, 50);
34     *rrectPoly.push() = SkPoint::Make(-100 - 4.330127f, 50 + 2.5f);
35     *rrectPoly.push() = SkPoint::Make(-100 - 3.535534f, 50 + 3.535534f);
36     *rrectPoly.push() = SkPoint::Make(-100 - 2.5f, 50 + 4.330127f);
37     REPORTER_ASSERT(reporter, SkIsConvexPolygon(rrectPoly.begin(), rrectPoly.count()));
38 
39     // inset a little
40     SkTDArray<SkPoint> offsetPoly;
41     bool result = SkOffsetSimplePolygon(rrectPoly.begin(), rrectPoly.count(), 3, &offsetPoly);
42     REPORTER_ASSERT(reporter, result);
43     REPORTER_ASSERT(reporter, SkIsConvexPolygon(offsetPoly.begin(), offsetPoly.count()));
44 
45     // inset to rect
46     result = SkOffsetSimplePolygon(rrectPoly.begin(), rrectPoly.count(), 10, &offsetPoly);
47     REPORTER_ASSERT(reporter, result);
48     REPORTER_ASSERT(reporter, SkIsConvexPolygon(offsetPoly.begin(), offsetPoly.count()));
49     REPORTER_ASSERT(reporter, offsetPoly.count() == 4);
50     if (offsetPoly.count() == 4) {
51         REPORTER_ASSERT(reporter, offsetPoly[0].equals(-95, 45));
52         REPORTER_ASSERT(reporter, offsetPoly[1].equals(95, 45));
53         REPORTER_ASSERT(reporter, offsetPoly[2].equals(95, -45));
54         REPORTER_ASSERT(reporter, offsetPoly[3].equals(-95, -45));
55     }
56 
57     // just to full inset
58     // fails, but outputs a line segment
59     result = SkOffsetSimplePolygon(rrectPoly.begin(), rrectPoly.count(), 55, &offsetPoly);
60     REPORTER_ASSERT(reporter, !result);
61     REPORTER_ASSERT(reporter, !SkIsConvexPolygon(offsetPoly.begin(), offsetPoly.count()));
62     REPORTER_ASSERT(reporter, offsetPoly.count() == 2);
63     if (offsetPoly.count() == 2) {
64         REPORTER_ASSERT(reporter, offsetPoly[0].equals(-50, 0));
65         REPORTER_ASSERT(reporter, offsetPoly[1].equals(50, 0));
66     }
67 
68     // past full inset
69     result = SkOffsetSimplePolygon(rrectPoly.begin(), rrectPoly.count(), 75, &offsetPoly);
70     REPORTER_ASSERT(reporter, !result);
71 
72     // troublesome case
73     SkTDArray<SkPoint> clippedRRectPoly;
74     *clippedRRectPoly.push() = SkPoint::Make(335.928101f, 428.219055f);
75     *clippedRRectPoly.push() = SkPoint::Make(330.414459f, 423.034912f);
76     *clippedRRectPoly.push() = SkPoint::Make(325.749084f, 417.395508f);
77     *clippedRRectPoly.push() = SkPoint::Make(321.931946f, 411.300842f);
78     *clippedRRectPoly.push() = SkPoint::Make(318.963074f, 404.750977f);
79     *clippedRRectPoly.push() = SkPoint::Make(316.842468f, 397.745850f);
80     *clippedRRectPoly.push() = SkPoint::Make(315.570068f, 390.285522f);
81     *clippedRRectPoly.push() = SkPoint::Make(315.145966f, 382.369965f);
82     *clippedRRectPoly.push() = SkPoint::Make(315.570068f, 374.454346f);
83     *clippedRRectPoly.push() = SkPoint::Make(316.842468f, 366.994019f);
84     *clippedRRectPoly.push() = SkPoint::Make(318.963074f, 359.988892f);
85     *clippedRRectPoly.push() = SkPoint::Make(321.931946f, 353.439056f);
86     *clippedRRectPoly.push() = SkPoint::Make(325.749084f, 347.344421f);
87     *clippedRRectPoly.push() = SkPoint::Make(330.414459f, 341.705017f);
88     *clippedRRectPoly.push() = SkPoint::Make(335.928101f, 336.520813f);
89     *clippedRRectPoly.push() = SkPoint::Make(342.289948f, 331.791901f);
90     *clippedRRectPoly.push() = SkPoint::Make(377.312134f, 331.791901f);
91     *clippedRRectPoly.push() = SkPoint::Make(381.195313f, 332.532593f);
92     *clippedRRectPoly.push() = SkPoint::Make(384.464935f, 334.754700f);
93     *clippedRRectPoly.push() = SkPoint::Make(386.687042f, 338.024292f);
94     *clippedRRectPoly.push() = SkPoint::Make(387.427765f, 341.907532f);
95     *clippedRRectPoly.push() = SkPoint::Make(387.427765f, 422.832367f);
96     *clippedRRectPoly.push() = SkPoint::Make(386.687042f, 426.715576f);
97     *clippedRRectPoly.push() = SkPoint::Make(384.464935f, 429.985168f);
98     *clippedRRectPoly.push() = SkPoint::Make(381.195313f, 432.207275f);
99     *clippedRRectPoly.push() = SkPoint::Make(377.312134f, 432.947998f);
100     *clippedRRectPoly.push() = SkPoint::Make(342.289948f, 432.947998f);
101     REPORTER_ASSERT(reporter, SkIsConvexPolygon(clippedRRectPoly.begin(),
102                                                 clippedRRectPoly.count()));
103 
104     result = SkOffsetSimplePolygon(clippedRRectPoly.begin(), clippedRRectPoly.count(), 32.3699417f,
105                                    &offsetPoly);
106     REPORTER_ASSERT(reporter, result);
107     REPORTER_ASSERT(reporter, SkIsConvexPolygon(offsetPoly.begin(), offsetPoly.count()));
108 
109     ////////////////////////////////////////////////////////////////////////////////
110     // Concave tests
111 
112     SkTDArray<SkPoint> starPoly;
113     *starPoly.push() = SkPoint::Make(0.0f, -50.0f);
114     *starPoly.push() = SkPoint::Make(14.43f, -25.0f);
115     *starPoly.push() = SkPoint::Make(43.30f, -25.0f);
116     *starPoly.push() = SkPoint::Make(28.86f, 0.0f);
117     *starPoly.push() = SkPoint::Make(43.30f, 25.0f);
118     *starPoly.push() = SkPoint::Make(14.43f, 25.0f);
119     *starPoly.push() = SkPoint::Make(0.0f, 50.0f);
120     *starPoly.push() = SkPoint::Make(-14.43f, 25.0f);
121     *starPoly.push() = SkPoint::Make(-43.30f, 25.0f);
122     *starPoly.push() = SkPoint::Make(-28.86f, 0.0f);
123     *starPoly.push() = SkPoint::Make(-43.30f, -25.0f);
124     *starPoly.push() = SkPoint::Make(-14.43f, -25.0f);
125     REPORTER_ASSERT(reporter, SkIsSimplePolygon(starPoly.begin(), starPoly.count()));
126 
127     // try a variety of distances
128     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), 0.1f,
129                                    &offsetPoly);
130     REPORTER_ASSERT(reporter, result);
131     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
132 
133     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), 5.665f,
134                                    &offsetPoly);
135     REPORTER_ASSERT(reporter, result);
136     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
137 
138     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), 28,
139                                    &offsetPoly);
140     REPORTER_ASSERT(reporter, result);
141     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
142 
143     // down to a point
144     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), 28.866f,
145                                    &offsetPoly);
146     REPORTER_ASSERT(reporter, !result);
147 
148     // and past
149     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), 50.5f,
150                                    &offsetPoly);
151     REPORTER_ASSERT(reporter, !result);
152 
153     // and now out
154     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), -0.1f,
155                                    &offsetPoly);
156     REPORTER_ASSERT(reporter, result);
157     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
158 
159     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), -5.6665f,
160                                    &offsetPoly);
161     REPORTER_ASSERT(reporter, result);
162     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
163 
164     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), -50,
165                                    &offsetPoly);
166     REPORTER_ASSERT(reporter, result);
167     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
168 
169     result = SkOffsetSimplePolygon(starPoly.begin(), starPoly.count(), -100,
170                                    &offsetPoly);
171     REPORTER_ASSERT(reporter, result);
172     REPORTER_ASSERT(reporter, SkIsSimplePolygon(offsetPoly.begin(), offsetPoly.count()));
173 
174     SkTDArray<SkPoint> intersectingPoly;
175     *intersectingPoly.push() = SkPoint::Make(0.0f, -50.0f);
176     *intersectingPoly.push() = SkPoint::Make(14.43f, -25.0f);
177     *intersectingPoly.push() = SkPoint::Make(43.30f, -25.0f);
178     *intersectingPoly.push() = SkPoint::Make(-28.86f, 0.0f);
179     *intersectingPoly.push() = SkPoint::Make(43.30f, 25.0f);
180     *intersectingPoly.push() = SkPoint::Make(14.43f, 25.0f);
181     *intersectingPoly.push() = SkPoint::Make(0.0f, 50.0f);
182     *intersectingPoly.push() = SkPoint::Make(-14.43f, 25.0f);
183     *intersectingPoly.push() = SkPoint::Make(-43.30f, 25.0f);
184     *intersectingPoly.push() = SkPoint::Make(28.86f, 0.0f);
185     *intersectingPoly.push() = SkPoint::Make(-43.30f, -25.0f);
186     *intersectingPoly.push() = SkPoint::Make(-14.43f, -25.0f);
187 
188     // SkOffsetSimplePolygon now assumes that the input is simple, so we'll just check for that
189     result = SkIsSimplePolygon(intersectingPoly.begin(), intersectingPoly.count());
190     REPORTER_ASSERT(reporter, !result);
191 }
192