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| 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 "SkLineParameters.h" |
| 8 #include "Test.h" |
| 9 |
| 10 // tests to verify that distance calculations are coded correctly |
| 11 static const SkDCubic tests[] = { |
| 12 {{{0, 0}, {1, 1}, {2, 2}, {0, 3}}}, |
| 13 {{{0, 0}, {1, 1}, {2, 2}, {3, 0}}}, |
| 14 {{{0, 0}, {5, 0}, {-2, 4}, {3, 4}}}, |
| 15 {{{0, 2}, {1, 0}, {2, 0}, {3, 0}}}, |
| 16 {{{0, .2}, {1, 0}, {2, 0}, {3, 0}}}, |
| 17 {{{0, .02}, {1, 0}, {2, 0}, {3, 0}}}, |
| 18 {{{0, .002}, {1, 0}, {2, 0}, {3, 0}}}, |
| 19 {{{0, .0002}, {1, 0}, {2, 0}, {3, 0}}}, |
| 20 {{{0, .00002}, {1, 0}, {2, 0}, {3, 0}}}, |
| 21 {{{0, FLT_EPSILON * 2}, {1, 0}, {2, 0}, {3, 0}}}, |
| 22 }; |
| 23 |
| 24 static const double answers[][2] = { |
| 25 {1, 2}, |
| 26 {1, 2}, |
| 27 {4, 4}, |
| 28 {1.1094003924, 0.5547001962}, |
| 29 {0.133038021, 0.06651901052}, |
| 30 {0.0133330370, 0.006666518523}, |
| 31 {0.001333333037, 0.0006666665185}, |
| 32 {0.000133333333, 6.666666652e-05}, |
| 33 {1.333333333e-05, 6.666666667e-06}, |
| 34 {1.5894571940104115e-07, 7.9472859700520577e-08}, |
| 35 }; |
| 36 |
| 37 static const size_t tests_count = sizeof(tests) / sizeof(tests[0]); |
| 38 |
| 39 static void LineParameterTest(skiatest::Reporter* reporter) { |
| 40 for (size_t index = 0; index < tests_count; ++index) { |
| 41 SkLineParameters lineParameters; |
| 42 const SkDCubic& cubic = tests[index]; |
| 43 lineParameters.cubicEndPoints(cubic); |
| 44 double denormalizedDistance[2]; |
| 45 denormalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1); |
| 46 denormalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2); |
| 47 double normalSquared = lineParameters.normalSquared(); |
| 48 size_t inner; |
| 49 for (inner = 0; inner < 2; ++inner) { |
| 50 double distSq = denormalizedDistance[inner]; |
| 51 distSq *= distSq; |
| 52 double answersSq = answers[index][inner]; |
| 53 answersSq *= answersSq; |
| 54 if (AlmostEqualUlps(distSq, normalSquared * answersSq)) { |
| 55 continue; |
| 56 } |
| 57 SkDebugf("%s [%d,%d] denormalizedDistance:%g != answer:%g" |
| 58 " distSq:%g answerSq:%g normalSquared:%g\n", |
| 59 __FUNCTION__, static_cast<int>(index), (int)inner, |
| 60 denormalizedDistance[inner], answers[index][inner], |
| 61 distSq, answersSq, normalSquared); |
| 62 } |
| 63 lineParameters.normalize(); |
| 64 double normalizedDistance[2]; |
| 65 normalizedDistance[0] = lineParameters.controlPtDistance(cubic, 1); |
| 66 normalizedDistance[1] = lineParameters.controlPtDistance(cubic, 2); |
| 67 for (inner = 0; inner < 2; ++inner) { |
| 68 if (AlmostEqualUlps(fabs(normalizedDistance[inner]), answers[index][
inner])) { |
| 69 continue; |
| 70 } |
| 71 SkDebugf("%s [%d,%d] normalizedDistance:%1.10g != answer:%g\n", |
| 72 __FUNCTION__, static_cast<int>(index), (int)inner, |
| 73 normalizedDistance[inner], answers[index][inner]); |
| 74 REPORTER_ASSERT(reporter, 0); |
| 75 } |
| 76 } |
| 77 } |
| 78 |
| 79 #include "TestClassDef.h" |
| 80 DEFINE_TESTCLASS("PathOpsLineParameters", PathOpsLineParametersClass, LineParame
terTest) |
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