1 #include "Test.h" 2 #include "SkMatrix44.h" 3 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 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 28 static bool is_identity(const SkMatrix44& m) { 29 SkMatrix44 identity; 30 identity.reset(); 31 return nearly_equal(m, identity); 32 } 33 34 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
