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-rw-r--r--tests/SkGaussFilterTest.cpp88
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diff --git a/tests/SkGaussFilterTest.cpp b/tests/SkGaussFilterTest.cpp
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-/*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkGaussFilter.h"
-
-#include <cmath>
-#include <tuple>
-#include <vector>
-#include "Test.h"
-
-// one part in a million
-static constexpr double kEpsilon = 0.000001;
-
-static double careful_add(int n, double* gauss) {
- // Sum smallest to largest to retain precision.
- double sum = 0;
- for (int i = n - 1; i >= 1; i--) {
- sum += 2.0 * gauss[i];
- }
- sum += gauss[0];
- return sum;
-}
-
-DEF_TEST(SkGaussFilterCommon, r) {
- using Test = std::tuple<double, SkGaussFilter::Type, std::vector<double>>;
-
- auto golden_check = [&](const Test& test) {
- double sigma; SkGaussFilter::Type type; std::vector<double> golden;
- std::tie(sigma, type, golden) = test;
- SkGaussFilter filter{sigma, type};
- double result[5];
- size_t n = filter.filterDouble(result);
- REPORTER_ASSERT(r, n == golden.size());
- double sum = careful_add(n, result);
- REPORTER_ASSERT(r, sum == 1.0);
- for (size_t i = 0; i < golden.size(); i++) {
- REPORTER_ASSERT(r, std::abs(golden[i] - result[i]) < kEpsilon);
- }
- };
-
- // The following two sigmas account for about 85% of all sigmas used for masks.
- // Golden values generated using Mathematica.
- auto tests = {
- // 0.788675 - most common mask sigma.
- // GaussianMatrix[{{Automatic}, {.788675}}, Method -> "Gaussian"]
- Test{0.788675, SkGaussFilter::Type::Gaussian, {0.506205, 0.226579, 0.0203189}},
-
- // GaussianMatrix[{{Automatic}, {.788675}}]
- Test{0.788675, SkGaussFilter::Type::Bessel, {0.593605, 0.176225, 0.0269721}},
-
- // 1.07735 - second most common mask sigma.
- // GaussianMatrix[{{Automatic}, {1.07735}}, Method -> "Gaussian"]
- Test{1.07735, SkGaussFilter::Type::Gaussian, {0.376362, 0.244636, 0.0671835}},
-
- // GaussianMatrix[{{4}, {1.07735}}, Method -> "Bessel"]
- Test{1.07735, SkGaussFilter::Type::Bessel, {0.429537, 0.214955, 0.059143, 0.0111337}},
- };
-
- for (auto& test : tests) {
- golden_check(test);
- }
-}
-
-DEF_TEST(SkGaussFilterSweep, r) {
- // The double just before 2.0.
- const double maxSigma = nextafter(2.0, 0.0);
- for (auto type : {SkGaussFilter::Type::Gaussian, SkGaussFilter::Type::Bessel}) {
-
- auto check = [&](double sigma) {
- SkGaussFilter filter{sigma, type};
- double result[5];
- int n = filter.filterDouble(result);
- REPORTER_ASSERT(r, n <= 5);
- double sum = careful_add(n, result);
- REPORTER_ASSERT(r, sum == 1.0);
- };
-
- for (double sigma = 0.0; sigma < 2.0; sigma += 0.1) {
- check(sigma);
- }
-
- check(maxSigma);
- }
-}