1 #include "Test.h"
2 #include "SkMatrix44.h"
3
nearly_equal_scalar(SkScalar a,SkScalar b)4 static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
5 // Note that we get more compounded error for multiple operations when
6 // SK_SCALAR_IS_FIXED.
7 #ifdef SK_SCALAR_IS_FLOAT
8 const SkScalar tolerance = SK_Scalar1 / 200000;
9 #else
10 const SkScalar tolerance = SK_Scalar1 / 1024;
11 #endif
12
13 return SkScalarAbs(a - b) <= tolerance;
14 }
15
nearly_equal(const SkMatrix44 & a,const SkMatrix44 & b)16 static bool nearly_equal(const SkMatrix44& a, const SkMatrix44& b) {
17 for (int i = 0; i < 4; ++i) {
18 for (int j = 0; j < 4; ++j) {
19 if (!nearly_equal_scalar(a.get(i, j), b.get(i, j))) {
20 printf("not equal %g %g\n", (float)a.get(i, j), (float)b.get(i, j));
21 return false;
22 }
23 }
24 }
25 return true;
26 }
27
is_identity(const SkMatrix44 & m)28 static bool is_identity(const SkMatrix44& m) {
29 SkMatrix44 identity;
30 identity.reset();
31 return nearly_equal(m, identity);
32 }
33
34
TestMatrix44(skiatest::Reporter * reporter)35 void TestMatrix44(skiatest::Reporter* reporter) {
36 SkMatrix44 mat, inverse, iden1, iden2, rot;
37
38 mat.reset();
39 mat.setTranslate(SK_Scalar1, SK_Scalar1, SK_Scalar1);
40 mat.invert(&inverse);
41 iden1.setConcat(mat, inverse);
42 REPORTER_ASSERT(reporter, is_identity(iden1));
43
44 mat.setScale(SkIntToScalar(2), SkIntToScalar(2), SkIntToScalar(2));
45 mat.invert(&inverse);
46 iden1.setConcat(mat, inverse);
47 REPORTER_ASSERT(reporter, is_identity(iden1));
48
49 mat.setScale(SK_Scalar1/2, SK_Scalar1/2, SK_Scalar1/2);
50 mat.invert(&inverse);
51 iden1.setConcat(mat, inverse);
52 REPORTER_ASSERT(reporter, is_identity(iden1));
53
54 mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20));
55 rot.setRotateDegreesAbout(
56 SkIntToScalar(0),
57 SkIntToScalar(0),
58 SkIntToScalar(-1),
59 SkIntToScalar(90));
60 mat.postConcat(rot);
61 REPORTER_ASSERT(reporter, mat.invert(NULL));
62 mat.invert(&inverse);
63 iden1.setConcat(mat, inverse);
64 REPORTER_ASSERT(reporter, is_identity(iden1));
65 iden2.setConcat(inverse, mat);
66 REPORTER_ASSERT(reporter, is_identity(iden2));
67 }
68
69 #include "TestClassDef.h"
70 DEFINE_TESTCLASS("Matrix44", Matrix44TestClass, TestMatrix44)
71