Changing the visibility of SkMatrix44::determinant().
Review URL: https://codereview.appspot.com/6819080
git-svn-id: http://skia.googlecode.com/svn/trunk@6395 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/Matrix44Test.cpp b/tests/Matrix44Test.cpp
index 086321c..af10e00 100644
--- a/tests/Matrix44Test.cpp
+++ b/tests/Matrix44Test.cpp
@@ -8,6 +8,14 @@
#include "Test.h"
#include "SkMatrix44.h"
+static bool nearly_equal_double(double a, double b) {
+ const double tolerance = 1e-7;
+ double diff = a - b;
+ if (diff < 0)
+ diff = -diff;
+ return diff <= tolerance;
+}
+
static bool nearly_equal_scalar(SkMScalar a, SkMScalar b) {
// Note that we get more compounded error for multiple operations when
// SK_SCALAR_IS_FIXED.
@@ -114,6 +122,31 @@
}
}
+static void test_determinant(skiatest::Reporter* reporter) {
+ SkMatrix44 a;
+ REPORTER_ASSERT(reporter, nearly_equal_double(1, a.determinant()));
+ a.set(1, 1, SkFloatToMScalar(2));
+ REPORTER_ASSERT(reporter, nearly_equal_double(2, a.determinant()));
+ SkMatrix44 b;
+ REPORTER_ASSERT(reporter, a.invert(&b));
+ REPORTER_ASSERT(reporter, nearly_equal_double(0.5, b.determinant()));
+ SkMatrix44 c = b = a;
+ c.set(0, 1, SkFloatToMScalar(4));
+ b.set(1, 0, SkFloatToMScalar(4));
+ REPORTER_ASSERT(reporter,
+ nearly_equal_double(a.determinant(),
+ b.determinant()));
+ SkMatrix44 d = a;
+ d.set(0, 0, SkFloatToMScalar(8));
+ REPORTER_ASSERT(reporter, nearly_equal_double(16, d.determinant()));
+
+ SkMatrix44 e = a;
+ e.postConcat(d);
+ REPORTER_ASSERT(reporter, nearly_equal_double(32, e.determinant()));
+ e.set(0, 0, SkFloatToMScalar(0));
+ REPORTER_ASSERT(reporter, nearly_equal_double(0, e.determinant()));
+}
+
static void TestMatrix44(skiatest::Reporter* reporter) {
#ifdef SK_SCALAR_IS_FLOAT
SkMatrix44 mat, inverse, iden1, iden2, rot;
@@ -182,6 +215,8 @@
if (false) { // avoid bit rot, suppress warning (working on making this pass)
test_common_angles(reporter);
}
+
+ test_determinant(reporter);
#endif
}