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skia2/tests/PathMeasureTest.cpp
bsalomon@google.com 2fc2359aaa Fix test_small_segments3 path measure test. 
Review URL: https://codereview.appspot.com/6601050

git-svn-id: http://skia.googlecode.com/svn/trunk@5792 2bbb7eff-a529-9590-31e7-b0007b416f81
2012-10-03 19:10:31 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkPathMeasure.h"
static void test_small_segment3(skiatest::Reporter* reporter) {
#ifdef SK_SCALAR_IS_FLOAT
SkPath path;
const SkPoint pts[] = {
{ 0, 0 },
{ 100000000000.0f, 100000000000.0f }, { 0, 0 }, { 10, 10 },
{ 10, 10 }, { 0, 0 }, { 10, 10 }
};
path.moveTo(pts[0]);
for (size_t i = 1; i < SK_ARRAY_COUNT(pts); i += 3) {
path.cubicTo(pts[i], pts[i + 1], pts[i + 2]);
}
SkPathMeasure meas(path, false);
meas.getLength();
#endif
}
static void test_small_segment2(skiatest::Reporter* reporter) {
#ifdef SK_SCALAR_IS_FLOAT
SkPath path;
const SkPoint pts[] = {
{ 0, 0 },
{ 100000000000.0f, 100000000000.0f }, { 0, 0 },
{ 10, 10 }, { 0, 0 },
};
path.moveTo(pts[0]);
for (size_t i = 1; i < SK_ARRAY_COUNT(pts); i += 2) {
path.quadTo(pts[i], pts[i + 1]);
}
SkPathMeasure meas(path, false);
meas.getLength();
#endif
}
static void test_small_segment(skiatest::Reporter* reporter) {
#ifdef SK_SCALAR_IS_FLOAT
SkPath path;
const SkPoint pts[] = {
{ 100000, 100000},
// big jump between these points, makes a big segment
{ SkFloatToScalar(1.0005f), SkFloatToScalar(0.9999f) },
// tiny (non-zero) jump between these points
{ SK_Scalar1, SK_Scalar1 },
};
path.moveTo(pts[0]);
for (size_t i = 1; i < SK_ARRAY_COUNT(pts); ++i) {
path.lineTo(pts[i]);
}
SkPathMeasure meas(path, false);
/* this would assert (before a fix) because we added a segment with
the same length as the prev segment, due to the follow (bad) pattern
d = distance(pts[0], pts[1]);
distance += d;
seg->fDistance = distance;
SkASSERT(d > 0); // TRUE
SkASSERT(seg->fDistance > prevSeg->fDistance); // FALSE
This 2nd assert failes because (distance += d) didn't affect distance
because distance >>> d.
*/
meas.getLength();
#endif
}
static void TestPathMeasure(skiatest::Reporter* reporter) {
SkPath path;
path.moveTo(0, 0);
path.lineTo(SK_Scalar1, 0);
path.lineTo(SK_Scalar1, SK_Scalar1);
path.lineTo(0, SK_Scalar1);
SkPathMeasure meas(path, true);
SkScalar length = meas.getLength();
SkASSERT(length == SK_Scalar1*4);
path.reset();
path.moveTo(0, 0);
path.lineTo(SK_Scalar1*3, SK_Scalar1*4);
meas.setPath(&path, false);
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1*5);
path.reset();
path.addCircle(0, 0, SK_Scalar1);
meas.setPath(&path, true);
length = meas.getLength();
// SkDebugf("circle arc-length = %g\n", length);
// Test the behavior following a close not followed by a move.
path.reset();
path.lineTo(SK_Scalar1, 0);
path.lineTo(SK_Scalar1, SK_Scalar1);
path.lineTo(0, SK_Scalar1);
path.close();
path.lineTo(-SK_Scalar1, 0);
meas.setPath(&path, false);
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1 * 4);
meas.nextContour();
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1);
SkPoint position;
SkVector tangent;
REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX,
-SK_ScalarHalf,
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter, position.fY == 0);
REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1);
REPORTER_ASSERT(reporter, tangent.fY == 0);
// Test degenerate paths
path.reset();
path.moveTo(0, 0);
path.lineTo(0, 0);
path.lineTo(SK_Scalar1, 0);
path.quadTo(SK_Scalar1, 0, SK_Scalar1, 0);
path.quadTo(SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1 * 2);
path.cubicTo(SK_Scalar1, SK_Scalar1 * 2,
SK_Scalar1, SK_Scalar1 * 2,
SK_Scalar1, SK_Scalar1 * 2);
path.cubicTo(SK_Scalar1*2, SK_Scalar1 * 2,
SK_Scalar1*3, SK_Scalar1 * 2,
SK_Scalar1*4, SK_Scalar1 * 2);
meas.setPath(&path, false);
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1 * 6);
REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX,
SK_ScalarHalf,
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter, position.fY == 0);
REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
REPORTER_ASSERT(reporter, tangent.fY == 0);
REPORTER_ASSERT(reporter, meas.getPosTan(SkFloatToScalar(2.5f), &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX, SK_Scalar1, SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fY, SkFloatToScalar(1.5f)));
REPORTER_ASSERT(reporter, tangent.fX == 0);
REPORTER_ASSERT(reporter, tangent.fY == SK_Scalar1);
REPORTER_ASSERT(reporter, meas.getPosTan(SkFloatToScalar(4.5f), &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX,
SkFloatToScalar(2.5f),
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fY,
SkFloatToScalar(2.0f),
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
REPORTER_ASSERT(reporter, tangent.fY == 0);
path.reset();
path.moveTo(0, 0);
path.lineTo(SK_Scalar1, 0);
path.moveTo(SK_Scalar1, SK_Scalar1);
path.moveTo(SK_Scalar1 * 2, SK_Scalar1 * 2);
path.lineTo(SK_Scalar1, SK_Scalar1 * 2);
meas.setPath(&path, false);
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1);
REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX,
SK_ScalarHalf,
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter, position.fY == 0);
REPORTER_ASSERT(reporter, tangent.fX == SK_Scalar1);
REPORTER_ASSERT(reporter, tangent.fY == 0);
meas.nextContour();
length = meas.getLength();
REPORTER_ASSERT(reporter, length == SK_Scalar1);
REPORTER_ASSERT(reporter, meas.getPosTan(SK_ScalarHalf, &position, &tangent));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fX,
SkFloatToScalar(1.5f),
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter,
SkScalarNearlyEqual(position.fY,
SkFloatToScalar(2.0f),
SkFloatToScalar(0.0001f)));
REPORTER_ASSERT(reporter, tangent.fX == -SK_Scalar1);
REPORTER_ASSERT(reporter, tangent.fY == 0);
test_small_segment(reporter);
test_small_segment2(reporter);
test_small_segment3(reporter);
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("PathMeasure", PathMeasureTestClass, TestPathMeasure)
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