chromium/third_party/skia/src/core/SkGaussFilter.cpp

/*
 * 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 "src/core/SkGaussFilter.h"

#include "include/private/base/SkAssert.h"

#include <cmath>

// The value when we can stop expanding the filter. The spec implies that 3% is acceptable, but
// we just use 1%.
static constexpr double kGoodEnough = …;

// Normalize the values of gauss to 1.0, and make sure they add to one.
// NB if n == 1, then this will force gauss[0] == 1.
static void normalize(int n, double* gauss) { … }

static int calculate_bessel_factors(double sigma, double *gauss) { … }

SkGaussFilter::SkGaussFilter(double sigma) { … }