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 SkDCubic 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 SkDCubic& cubic = tests[index];
44 SkASSERT(ValidCubic(cubic));
45 lineParameters.cubicEndPoints(cubic, 0, 3);
46 double denormalizedDistance[2];
47 denormalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1);
48 denormalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2);
49 double normalSquared = lineParameters.normalSquared();
50 size_t inner;
51 for (inner = 0; inner < 2; ++inner) {
52 double distSq = denormalizedDistance[inner];
53 distSq *= distSq;
54 double answersSq = answers[index][inner];
55 answersSq *= answersSq;
56 if (AlmostEqualUlps(distSq, normalSquared * answersSq)) {
57 continue;
58 }
59 SkDebugf("%s [%d,%d] denormalizedDistance:%g != answer:%g"
60 " distSq:%g answerSq:%g normalSquared:%g\n",
61 __FUNCTION__, static_cast<int>(index), (int)inner,
62 denormalizedDistance[inner], answers[index][inner],
63 distSq, answersSq, normalSquared);
64 }
65 lineParameters.normalize();
66 double normalizedDistance[2];
67 normalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1);
68 normalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2);
69 for (inner = 0; inner < 2; ++inner) {
70 if (AlmostEqualUlps(fabs(normalizedDistance[inner]), answers[index][inner])) {
71 continue;
72 }
73 SkDebugf("%s [%d,%d] normalizedDistance:%1.9g != answer:%g\n",
74 __FUNCTION__, static_cast<int>(index), (int)inner,
75 normalizedDistance[inner], answers[index][inner]);
76 REPORTER_ASSERT(reporter, 0);
77 }
78 }
79 }
80