1 /*
2 * Copyright 2012 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 "PathOpsTestCommon.h"
8 #include "SkLineParameters.h"
9 #include "Test.h"
10
11 // tests to verify that distance calculations are coded correctly
12 static const CubicPts tests[] = {
13 {{{0, 0}, {1, 1}, {2, 2}, {0, 3}}},
14 {{{0, 0}, {1, 1}, {2, 2}, {3, 0}}},
15 {{{0, 0}, {5, 0}, {-2, 4}, {3, 4}}},
16 {{{0, 2}, {1, 0}, {2, 0}, {3, 0}}},
17 {{{0, .2}, {1, 0}, {2, 0}, {3, 0}}},
18 {{{0, .02}, {1, 0}, {2, 0}, {3, 0}}},
19 {{{0, .002}, {1, 0}, {2, 0}, {3, 0}}},
20 {{{0, .0002}, {1, 0}, {2, 0}, {3, 0}}},
21 {{{0, .00002}, {1, 0}, {2, 0}, {3, 0}}},
22 {{{0, FLT_EPSILON * 2}, {1, 0}, {2, 0}, {3, 0}}},
23 };
24
25 static const double answers[][2] = {
26 {1, 2},
27 {1, 2},
28 {4, 4},
29 {1.1094003924, 0.5547001962},
30 {0.133038021, 0.06651901052},
31 {0.0133330370, 0.006666518523},
32 {0.001333333037, 0.0006666665185},
33 {0.000133333333, 6.666666652e-05},
34 {1.333333333e-05, 6.666666667e-06},
35 {1.5894571940104115e-07, 7.9472859700520577e-08},
36 };
37
38 static const size_t tests_count = SK_ARRAY_COUNT(tests);
39
DEF_TEST(PathOpsLineParameters,reporter)40 DEF_TEST(PathOpsLineParameters, reporter) {
41 for (size_t index = 0; index < tests_count; ++index) {
42 SkLineParameters lineParameters;
43 const CubicPts& c = tests[index];
44 SkDCubic cubic;
45 cubic.debugSet(c.fPts);
46 SkASSERT(ValidCubic(cubic));
47 lineParameters.cubicEndPoints(cubic, 0, 3);
48 double denormalizedDistance[2];
49 denormalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1);
50 denormalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2);
51 double normalSquared = lineParameters.normalSquared();
52 size_t inner;
53 for (inner = 0; inner < 2; ++inner) {
54 double distSq = denormalizedDistance[inner];
55 distSq *= distSq;
56 double answersSq = answers[index][inner];
57 answersSq *= answersSq;
58 if (AlmostEqualUlps(distSq, normalSquared * answersSq)) {
59 continue;
60 }
61 SkDebugf("%s [%d,%d] denormalizedDistance:%g != answer:%g"
62 " distSq:%g answerSq:%g normalSquared:%g\n",
63 __FUNCTION__, static_cast<int>(index), (int)inner,
64 denormalizedDistance[inner], answers[index][inner],
65 distSq, answersSq, normalSquared);
66 }
67 lineParameters.normalize();
68 double normalizedDistance[2];
69 normalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1);
70 normalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2);
71 for (inner = 0; inner < 2; ++inner) {
72 if (AlmostEqualUlps(fabs(normalizedDistance[inner]), answers[index][inner])) {
73 continue;
74 }
75 SkDebugf("%s [%d,%d] normalizedDistance:%1.9g != answer:%g\n",
76 __FUNCTION__, static_cast<int>(index), (int)inner,
77 normalizedDistance[inner], answers[index][inner]);
78 REPORTER_ASSERT(reporter, 0);
79 }
80 }
81 }
82