/* * Copyright 2011 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "Test.h" #include "SkMath.h" #include "SkMatrix.h" #include "SkRandom.h" static bool nearly_equal_scalar(SkScalar a, SkScalar b) { // Note that we get more compounded error for multiple operations when // SK_SCALAR_IS_FIXED. #ifdef SK_SCALAR_IS_FLOAT const SkScalar tolerance = SK_Scalar1 / 200000; #else const SkScalar tolerance = SK_Scalar1 / 1024; #endif return SkScalarAbs(a - b) <= tolerance; } static bool nearly_equal(const SkMatrix& a, const SkMatrix& b) { for (int i = 0; i < 9; i++) { if (!nearly_equal_scalar(a[i], b[i])) { printf("not equal %g %g\n", (float)a[i], (float)b[i]); return false; } } return true; } static bool is_identity(const SkMatrix& m) { SkMatrix identity; identity.reset(); return nearly_equal(m, identity); } static void test_flatten(skiatest::Reporter* reporter, const SkMatrix& m) { // add 100 in case we have a bug, I don't want to kill my stack in the test char buffer[SkMatrix::kMaxFlattenSize + 100]; uint32_t size1 = m.flatten(NULL); uint32_t size2 = m.flatten(buffer); REPORTER_ASSERT(reporter, size1 == size2); REPORTER_ASSERT(reporter, size1 <= SkMatrix::kMaxFlattenSize); SkMatrix m2; uint32_t size3 = m2.unflatten(buffer); REPORTER_ASSERT(reporter, size1 == size2); REPORTER_ASSERT(reporter, m == m2); char buffer2[SkMatrix::kMaxFlattenSize + 100]; size3 = m2.flatten(buffer2); REPORTER_ASSERT(reporter, size1 == size2); REPORTER_ASSERT(reporter, memcmp(buffer, buffer2, size1) == 0); } void test_matrix_max_stretch(skiatest::Reporter* reporter) { SkMatrix identity; identity.reset(); REPORTER_ASSERT(reporter, SK_Scalar1 == identity.getMaxStretch()); SkMatrix scale; scale.setScale(SK_Scalar1 * 2, SK_Scalar1 * 4); REPORTER_ASSERT(reporter, SK_Scalar1 * 4 == scale.getMaxStretch()); SkMatrix rot90Scale; rot90Scale.setRotate(90 * SK_Scalar1); rot90Scale.postScale(SK_Scalar1 / 4, SK_Scalar1 / 2); REPORTER_ASSERT(reporter, SK_Scalar1 / 2 == rot90Scale.getMaxStretch()); SkMatrix rotate; rotate.setRotate(128 * SK_Scalar1); REPORTER_ASSERT(reporter, SkScalarAbs(SK_Scalar1 - rotate.getMaxStretch()) <= SK_ScalarNearlyZero); SkMatrix translate; translate.setTranslate(10 * SK_Scalar1, -5 * SK_Scalar1); REPORTER_ASSERT(reporter, SK_Scalar1 == translate.getMaxStretch()); SkMatrix perspX; perspX.reset(); perspX.setPerspX(SkScalarToPersp(SK_Scalar1 / 1000)); REPORTER_ASSERT(reporter, -SK_Scalar1 == perspX.getMaxStretch()); SkMatrix perspY; perspY.reset(); perspY.setPerspX(SkScalarToPersp(-SK_Scalar1 / 500)); REPORTER_ASSERT(reporter, -SK_Scalar1 == perspY.getMaxStretch()); SkMatrix baseMats[] = {scale, rot90Scale, rotate, translate, perspX, perspY}; SkMatrix mats[2*SK_ARRAY_COUNT(baseMats)]; for (int i = 0; i < SK_ARRAY_COUNT(baseMats); ++i) { mats[i] = baseMats[i]; bool invertable = mats[i].invert(&mats[i + SK_ARRAY_COUNT(baseMats)]); REPORTER_ASSERT(reporter, invertable); } SkRandom rand; for (int m = 0; m < 1000; ++m) { SkMatrix mat; mat.reset(); for (int i = 0; i < 4; ++i) { int x = rand.nextU() % SK_ARRAY_COUNT(mats); mat.postConcat(mats[x]); } SkScalar stretch = mat.getMaxStretch(); if ((stretch < 0) != mat.hasPerspective()) { stretch = mat.getMaxStretch(); } REPORTER_ASSERT(reporter, (stretch < 0) == mat.hasPerspective()); if (mat.hasPerspective()) { m -= 1; // try another non-persp matrix continue; } // test a bunch of vectors. None should be scaled by more than stretch // (modulo some error) and we should find a vector that is scaled by // almost stretch. static const SkScalar gStretchTol = (105 * SK_Scalar1) / 100; static const SkScalar gMaxStretchTol = (97 * SK_Scalar1) / 100; SkScalar max = 0; SkVector vectors[1000]; for (int i = 0; i < SK_ARRAY_COUNT(vectors); ++i) { vectors[i].fX = rand.nextSScalar1(); vectors[i].fY = rand.nextSScalar1(); if (!vectors[i].normalize()) { i -= 1; continue; } } mat.mapVectors(vectors, SK_ARRAY_COUNT(vectors)); for (int i = 0; i < SK_ARRAY_COUNT(vectors); ++i) { SkScalar d = vectors[i].length(); REPORTER_ASSERT(reporter, SkScalarDiv(d, stretch) < gStretchTol); if (max < d) { max = d; } } REPORTER_ASSERT(reporter, SkScalarDiv(max, stretch) >= gMaxStretchTol); } } void TestMatrix(skiatest::Reporter* reporter) { SkMatrix mat, inverse, iden1, iden2; mat.reset(); mat.setTranslate(SK_Scalar1, SK_Scalar1); mat.invert(&inverse); iden1.setConcat(mat, inverse); REPORTER_ASSERT(reporter, is_identity(iden1)); mat.setScale(SkIntToScalar(2), SkIntToScalar(2)); mat.invert(&inverse); iden1.setConcat(mat, inverse); REPORTER_ASSERT(reporter, is_identity(iden1)); test_flatten(reporter, mat); mat.setScale(SK_Scalar1/2, SK_Scalar1/2); mat.invert(&inverse); iden1.setConcat(mat, inverse); REPORTER_ASSERT(reporter, is_identity(iden1)); test_flatten(reporter, mat); mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0); mat.postRotate(SkIntToScalar(25)); REPORTER_ASSERT(reporter, mat.invert(NULL)); mat.invert(&inverse); iden1.setConcat(mat, inverse); REPORTER_ASSERT(reporter, is_identity(iden1)); iden2.setConcat(inverse, mat); REPORTER_ASSERT(reporter, is_identity(iden2)); test_flatten(reporter, mat); test_flatten(reporter, iden2); // rectStaysRect test { static const struct { SkScalar m00, m01, m10, m11; bool mStaysRect; } gRectStaysRectSamples[] = { { 0, 0, 0, 0, false }, { 0, 0, 0, SK_Scalar1, false }, { 0, 0, SK_Scalar1, 0, false }, { 0, 0, SK_Scalar1, SK_Scalar1, false }, { 0, SK_Scalar1, 0, 0, false }, { 0, SK_Scalar1, 0, SK_Scalar1, false }, { 0, SK_Scalar1, SK_Scalar1, 0, true }, { 0, SK_Scalar1, SK_Scalar1, SK_Scalar1, false }, { SK_Scalar1, 0, 0, 0, false }, { SK_Scalar1, 0, 0, SK_Scalar1, true }, { SK_Scalar1, 0, SK_Scalar1, 0, false }, { SK_Scalar1, 0, SK_Scalar1, SK_Scalar1, false }, { SK_Scalar1, SK_Scalar1, 0, 0, false }, { SK_Scalar1, SK_Scalar1, 0, SK_Scalar1, false }, { SK_Scalar1, SK_Scalar1, SK_Scalar1, 0, false }, { SK_Scalar1, SK_Scalar1, SK_Scalar1, SK_Scalar1, false } }; for (size_t i = 0; i < SK_ARRAY_COUNT(gRectStaysRectSamples); i++) { SkMatrix m; m.reset(); m.set(SkMatrix::kMScaleX, gRectStaysRectSamples[i].m00); m.set(SkMatrix::kMSkewX, gRectStaysRectSamples[i].m01); m.set(SkMatrix::kMSkewY, gRectStaysRectSamples[i].m10); m.set(SkMatrix::kMScaleY, gRectStaysRectSamples[i].m11); REPORTER_ASSERT(reporter, m.rectStaysRect() == gRectStaysRectSamples[i].mStaysRect); } } mat.reset(); mat.set(SkMatrix::kMScaleX, SkIntToScalar(1)); mat.set(SkMatrix::kMSkewX, SkIntToScalar(2)); mat.set(SkMatrix::kMTransX, SkIntToScalar(3)); mat.set(SkMatrix::kMSkewY, SkIntToScalar(4)); mat.set(SkMatrix::kMScaleY, SkIntToScalar(5)); mat.set(SkMatrix::kMTransY, SkIntToScalar(6)); SkScalar affine[6]; REPORTER_ASSERT(reporter, mat.asAffine(affine)); #define affineEqual(e) affine[SkMatrix::kA##e] == mat.get(SkMatrix::kM##e) REPORTER_ASSERT(reporter, affineEqual(ScaleX)); REPORTER_ASSERT(reporter, affineEqual(SkewY)); REPORTER_ASSERT(reporter, affineEqual(SkewX)); REPORTER_ASSERT(reporter, affineEqual(ScaleY)); REPORTER_ASSERT(reporter, affineEqual(TransX)); REPORTER_ASSERT(reporter, affineEqual(TransY)); #undef affineEqual mat.set(SkMatrix::kMPersp1, SkScalarToPersp(SK_Scalar1 / 2)); REPORTER_ASSERT(reporter, !mat.asAffine(affine)); test_matrix_max_stretch(reporter); } #include "TestClassDef.h" DEFINE_TESTCLASS("Matrix", MatrixTestClass, TestMatrix)