2047f00e46
http://codereview.appspot.com/4532064/ git-svn-id: http://skia.googlecode.com/svn/trunk@1351 2bbb7eff-a529-9590-31e7-b0007b416f81
124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
#include "Test.h"
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#include "SkMatrix.h"
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static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
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// Note that we get more compounded error for multiple operations when
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// SK_SCALAR_IS_FIXED.
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#ifdef SK_SCALAR_IS_FLOAT
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const SkScalar tolerance = SK_Scalar1 / 200000;
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#else
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const SkScalar tolerance = SK_Scalar1 / 1024;
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#endif
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return SkScalarAbs(a - b) <= tolerance;
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}
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static bool nearly_equal(const SkMatrix& a, const SkMatrix& b) {
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for (int i = 0; i < 9; i++) {
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if (!nearly_equal_scalar(a[i], b[i])) {
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printf("not equal %g %g\n", (float)a[i], (float)b[i]);
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return false;
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}
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}
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return true;
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}
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static bool is_identity(const SkMatrix& m) {
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SkMatrix identity;
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identity.reset();
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return nearly_equal(m, identity);
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}
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static void test_flatten(skiatest::Reporter* reporter, const SkMatrix& m) {
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// add 100 in case we have a bug, I don't want to kill my stack in the test
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char buffer[SkMatrix::kMaxFlattenSize + 100];
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uint32_t size1 = m.flatten(NULL);
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uint32_t size2 = m.flatten(buffer);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, size1 <= SkMatrix::kMaxFlattenSize);
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SkMatrix m2;
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uint32_t size3 = m2.unflatten(buffer);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, m == m2);
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char buffer2[SkMatrix::kMaxFlattenSize + 100];
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size3 = m2.flatten(buffer2);
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REPORTER_ASSERT(reporter, size1 == size2);
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REPORTER_ASSERT(reporter, memcmp(buffer, buffer2, size1) == 0);
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}
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void TestMatrix(skiatest::Reporter* reporter) {
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SkMatrix mat, inverse, iden1, iden2;
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mat.reset();
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mat.setTranslate(SK_Scalar1, SK_Scalar1);
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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mat.setScale(SkIntToScalar(2), SkIntToScalar(2));
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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test_flatten(reporter, mat);
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mat.setScale(SK_Scalar1/2, SK_Scalar1/2);
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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test_flatten(reporter, mat);
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mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0);
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mat.postRotate(SkIntToScalar(25));
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REPORTER_ASSERT(reporter, mat.invert(NULL));
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mat.invert(&inverse);
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iden1.setConcat(mat, inverse);
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REPORTER_ASSERT(reporter, is_identity(iden1));
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iden2.setConcat(inverse, mat);
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REPORTER_ASSERT(reporter, is_identity(iden2));
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test_flatten(reporter, mat);
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test_flatten(reporter, iden2);
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// rectStaysRect test
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{
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static const struct {
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SkScalar m00, m01, m10, m11;
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bool mStaysRect;
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}
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gRectStaysRectSamples[] = {
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{ 0, 0, 0, 0, false },
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{ 0, 0, 0, SK_Scalar1, false },
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{ 0, 0, SK_Scalar1, 0, false },
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{ 0, 0, SK_Scalar1, SK_Scalar1, false },
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{ 0, SK_Scalar1, 0, 0, false },
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{ 0, SK_Scalar1, 0, SK_Scalar1, false },
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{ 0, SK_Scalar1, SK_Scalar1, 0, true },
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{ 0, SK_Scalar1, SK_Scalar1, SK_Scalar1, false },
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{ SK_Scalar1, 0, 0, 0, false },
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{ SK_Scalar1, 0, 0, SK_Scalar1, true },
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{ SK_Scalar1, 0, SK_Scalar1, 0, false },
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{ SK_Scalar1, 0, SK_Scalar1, SK_Scalar1, false },
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{ SK_Scalar1, SK_Scalar1, 0, 0, false },
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{ SK_Scalar1, SK_Scalar1, 0, SK_Scalar1, false },
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{ SK_Scalar1, SK_Scalar1, SK_Scalar1, 0, false },
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{ SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1, false }
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};
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for (size_t i = 0; i < SK_ARRAY_COUNT(gRectStaysRectSamples); i++) {
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SkMatrix m;
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m.reset();
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m.set(SkMatrix::kMScaleX, gRectStaysRectSamples[i].m00);
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m.set(SkMatrix::kMSkewX, gRectStaysRectSamples[i].m01);
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m.set(SkMatrix::kMSkewY, gRectStaysRectSamples[i].m10);
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m.set(SkMatrix::kMScaleY, gRectStaysRectSamples[i].m11);
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REPORTER_ASSERT(reporter,
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m.rectStaysRect() == gRectStaysRectSamples[i].mStaysRect);
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}
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}
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}
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#include "TestClassDef.h"
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DEFINE_TESTCLASS("Matrix", MatrixTestClass, TestMatrix)
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