epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
reed@android.com | 5e5adfd | 2009-03-07 03:39:23 +0000 | [diff] [blame] | 8 | #include "Test.h" |
| 9 | #include "SkPathMeasure.h" |
| 10 | |
reed@google.com | fab1ddd | 2012-04-20 15:10:32 +0000 | [diff] [blame^] | 11 | static void test_small_segment(skiatest::Reporter* reporter) { |
| 12 | #ifdef SK_SCALAR_IS_FLOAT |
| 13 | SkPath path; |
| 14 | const SkPoint pts[] = { |
| 15 | { 100000, 100000}, |
| 16 | // big jump between these points, makes a big segment |
| 17 | { 1.0005, 0.9999 }, |
| 18 | // tiny (non-zero) jump between these points |
| 19 | { 1, 1 }, |
| 20 | }; |
| 21 | |
| 22 | path.moveTo(pts[0]); |
| 23 | for (size_t i = 1; i < SK_ARRAY_COUNT(pts); ++i) { |
| 24 | path.lineTo(pts[i]); |
| 25 | } |
| 26 | SkPathMeasure meas(path, false); |
| 27 | |
| 28 | /* this would assert (before a fix) because we added a segment with |
| 29 | the same length as the prev segment, due to the follow (bad) pattern |
| 30 | |
| 31 | d = distance(pts[0], pts[1]); |
| 32 | distance += d; |
| 33 | seg->fDistance = distance; |
| 34 | |
| 35 | SkASSERT(d > 0); // TRUE |
| 36 | SkASSERT(seg->fDistance > prevSeg->fDistance); // FALSE |
| 37 | |
| 38 | This 2nd assert failes because (distance += d) didn't affect distance |
| 39 | because distance >>> d. |
| 40 | */ |
| 41 | meas.getLength(); |
| 42 | #endif |
| 43 | } |
| 44 | |
reed@android.com | 5e5adfd | 2009-03-07 03:39:23 +0000 | [diff] [blame] | 45 | static void TestPathMeasure(skiatest::Reporter* reporter) { |
| 46 | SkPath path; |
| 47 | |
| 48 | path.moveTo(0, 0); |
| 49 | path.lineTo(SK_Scalar1, 0); |
| 50 | path.lineTo(SK_Scalar1, SK_Scalar1); |
| 51 | path.lineTo(0, SK_Scalar1); |
| 52 | |
| 53 | SkPathMeasure meas(path, true); |
| 54 | SkScalar length = meas.getLength(); |
| 55 | SkASSERT(length == SK_Scalar1*4); |
| 56 | |
| 57 | path.reset(); |
| 58 | path.moveTo(0, 0); |
| 59 | path.lineTo(SK_Scalar1*3, SK_Scalar1*4); |
| 60 | meas.setPath(&path, false); |
| 61 | length = meas.getLength(); |
| 62 | REPORTER_ASSERT(reporter, length == SK_Scalar1*5); |
| 63 | |
| 64 | path.reset(); |
| 65 | path.addCircle(0, 0, SK_Scalar1); |
| 66 | meas.setPath(&path, true); |
| 67 | length = meas.getLength(); |
| 68 | // SkDebugf("circle arc-length = %g\n", length); |
| 69 | |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 70 | // Test the behavior following a close not followed by a move. |
| 71 | path.reset(); |
| 72 | path.lineTo(SK_Scalar1, 0); |
| 73 | path.lineTo(SK_Scalar1, SK_Scalar1); |
| 74 | path.lineTo(0, SK_Scalar1); |
| 75 | path.close(); |
| 76 | path.lineTo(-SK_Scalar1, 0); |
| 77 | meas.setPath(&path, false); |
| 78 | length = meas.getLength(); |
| 79 | REPORTER_ASSERT(reporter, length == SK_Scalar1 * 4); |
| 80 | meas.nextContour(); |
| 81 | length = meas.getLength(); |
| 82 | REPORTER_ASSERT(reporter, length == SK_Scalar1); |
| 83 | SkPoint position; |
| 84 | SkVector tangent; |
| 85 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent)); |
| 86 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 87 | SkScalarNearlyEqual(position.fX, |
| 88 | -SK_ScalarHalf, |
| 89 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 90 | REPORTER_ASSERT(reporter, position.fY == 0); |
| 91 | REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1); |
| 92 | REPORTER_ASSERT(reporter, tangent.fY == 0); |
| 93 | |
| 94 | // Test degenerate paths |
| 95 | path.reset(); |
| 96 | path.moveTo(0, 0); |
| 97 | path.lineTo(0, 0); |
| 98 | path.lineTo(SK_Scalar1, 0); |
| 99 | path.quadTo(SK_Scalar1, 0, SK_Scalar1, 0); |
| 100 | path.quadTo(SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1 * 2); |
| 101 | path.cubicTo(SK_Scalar1, SK_Scalar1 * 2, |
| 102 | SK_Scalar1, SK_Scalar1 * 2, |
| 103 | SK_Scalar1, SK_Scalar1 * 2); |
| 104 | path.cubicTo(SK_Scalar1*2, SK_Scalar1 * 2, |
| 105 | SK_Scalar1*3, SK_Scalar1 * 2, |
| 106 | SK_Scalar1*4, SK_Scalar1 * 2); |
| 107 | meas.setPath(&path, false); |
| 108 | length = meas.getLength(); |
| 109 | REPORTER_ASSERT(reporter, length == SK_Scalar1 * 6); |
| 110 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent)); |
| 111 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 112 | SkScalarNearlyEqual(position.fX, |
| 113 | SK_ScalarHalf, |
| 114 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 115 | REPORTER_ASSERT(reporter, position.fY == 0); |
| 116 | REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1); |
| 117 | REPORTER_ASSERT(reporter, tangent.fY == 0); |
| 118 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_Scalar1 * 2.5f, &position, &tangent)); |
| 119 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 120 | SkScalarNearlyEqual(position.fX, SK_Scalar1, SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 121 | REPORTER_ASSERT(reporter, |
| 122 | SkScalarNearlyEqual(position.fY, SK_Scalar1 * 1.5f)); |
| 123 | REPORTER_ASSERT(reporter, tangent.fX == 0); |
| 124 | REPORTER_ASSERT(reporter, tangent.fY == SK_Scalar1); |
| 125 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_Scalar1 * 4.5f, &position, &tangent)); |
| 126 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 127 | SkScalarNearlyEqual(position.fX, |
| 128 | SkFloatToScalar(2.5f), |
| 129 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 130 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 131 | SkScalarNearlyEqual(position.fY, |
| 132 | SkFloatToScalar(2.0f), |
| 133 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 134 | REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1); |
| 135 | REPORTER_ASSERT(reporter, tangent.fY == 0); |
| 136 | |
| 137 | path.reset(); |
| 138 | path.moveTo(0, 0); |
| 139 | path.lineTo(SK_Scalar1, 0); |
| 140 | path.moveTo(SK_Scalar1, SK_Scalar1); |
| 141 | path.moveTo(SK_Scalar1 * 2, SK_Scalar1 * 2); |
| 142 | path.lineTo(SK_Scalar1, SK_Scalar1 * 2); |
| 143 | meas.setPath(&path, false); |
| 144 | length = meas.getLength(); |
| 145 | REPORTER_ASSERT(reporter, length == SK_Scalar1); |
| 146 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent)); |
| 147 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 148 | SkScalarNearlyEqual(position.fX, |
| 149 | SK_ScalarHalf, |
| 150 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 151 | REPORTER_ASSERT(reporter, position.fY == 0); |
| 152 | REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1); |
| 153 | REPORTER_ASSERT(reporter, tangent.fY == 0); |
| 154 | meas.nextContour(); |
| 155 | length = meas.getLength(); |
| 156 | REPORTER_ASSERT(reporter, length == SK_Scalar1); |
| 157 | REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent)); |
| 158 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 159 | SkScalarNearlyEqual(position.fX, |
| 160 | SkFloatToScalar(1.5f), |
| 161 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 162 | REPORTER_ASSERT(reporter, |
robertphillips@google.com | 6853e80 | 2012-04-16 15:50:18 +0000 | [diff] [blame] | 163 | SkScalarNearlyEqual(position.fY, |
| 164 | SkFloatToScalar(2.0f), |
| 165 | SkFloatToScalar(0.0001f))); |
schenney@chromium.org | 510c6b1 | 2012-01-12 20:04:06 +0000 | [diff] [blame] | 166 | REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1); |
| 167 | REPORTER_ASSERT(reporter, tangent.fY == 0); |
reed@google.com | fab1ddd | 2012-04-20 15:10:32 +0000 | [diff] [blame^] | 168 | |
| 169 | test_small_segment(reporter); |
reed@android.com | 5e5adfd | 2009-03-07 03:39:23 +0000 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | #include "TestClassDef.h" |
| 173 | DEFINE_TESTCLASS("PathMeasure", PathMeasureTestClass, TestPathMeasure) |