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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.
*/
// Unit tests for src/core/SkPoint.cpp and its header
#include "SkPoint.h"
#include "SkRect.h"
#include "Test.h"
static void test_casts(skiatest::Reporter* reporter) {
SkPoint p = { 0, 0 };
SkRect r = { 0, 0, 0, 0 };
const SkScalar* pPtr = SkTCast<const SkScalar*>(&p);
const SkScalar* rPtr = SkTCast<const SkScalar*>(&r);
REPORTER_ASSERT(reporter, p.asScalars() == pPtr);
REPORTER_ASSERT(reporter, r.asScalars() == rPtr);
}
// Tests SkPoint::Normalize() for this (x,y)
static void test_Normalize(skiatest::Reporter* reporter,
SkScalar x, SkScalar y) {
SkPoint point;
point.set(x, y);
SkScalar oldLength = point.length();
SkScalar returned = SkPoint::Normalize(&point);
SkScalar newLength = point.length();
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(returned, oldLength));
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(newLength, SK_Scalar1));
}
// Tests that SkPoint::length() and SkPoint::Length() both return
// approximately expectedLength for this (x,y).
static void test_length(skiatest::Reporter* reporter, SkScalar x, SkScalar y,
SkScalar expectedLength) {
SkPoint point;
point.set(x, y);
SkScalar s1 = point.length();
SkScalar s2 = SkPoint::Length(x, y);
//The following should be exactly the same, but need not be.
//See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, s2));
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(s1, expectedLength));
test_Normalize(reporter, x, y);
}
// test that we handle very large values correctly. i.e. that we can
// successfully normalize something whose mag overflows a float.
static void test_overflow(skiatest::Reporter* reporter) {
SkPoint pt = { SkFloatToScalar(3.4e38f), SkFloatToScalar(3.4e38f) };
SkScalar length = pt.length();
REPORTER_ASSERT(reporter, !SkScalarIsFinite(length));
// this should succeed, even though we can't represent length
REPORTER_ASSERT(reporter, pt.setLength(SK_Scalar1));
// now that pt is normalized, we check its length
length = pt.length();
REPORTER_ASSERT(reporter, SkScalarNearlyEqual(length, SK_Scalar1));
}
// test that we handle very small values correctly. i.e. that we can
// report failure if we try to normalize them.
static void test_underflow(skiatest::Reporter* reporter) {
SkPoint pt = { SkFloatToScalar(1.0e-37f), SkFloatToScalar(1.0e-37f) };
SkPoint copy = pt;
REPORTER_ASSERT(reporter, 0 == SkPoint::Normalize(&pt));
REPORTER_ASSERT(reporter, pt == copy); // pt is unchanged
REPORTER_ASSERT(reporter, !pt.setLength(SK_Scalar1));
REPORTER_ASSERT(reporter, pt == copy); // pt is unchanged
}
static void PointTest(skiatest::Reporter* reporter) {
test_casts(reporter);
static const struct {
SkScalar fX;
SkScalar fY;
SkScalar fLength;
} gRec[] = {
{ SkIntToScalar(3), SkIntToScalar(4), SkIntToScalar(5) },
{ SkFloatToScalar(0.6f), SkFloatToScalar(0.8f), SK_Scalar1 },
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
test_length(reporter, gRec[i].fX, gRec[i].fY, gRec[i].fLength);
}
test_underflow(reporter);
test_overflow(reporter);
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("Point", PointTestClass, PointTest)
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