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LibGfx+PixelPaint: Fix distortions in convolutions with size != 4 or 5

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AnotherTest 2020-10-04 22:56:20 +03:30 • committed by Andreas Kling
parent 95434d70ed
commit 93f4388e45
3 changed files with 32 additions and 12 deletions
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7
Applications/PixelPaint/FilterParams.h
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@ -121,14 +121,15 @@ template<size_t N>
struct FilterParameters<Gfx::SpatialGaussianBlurFilter<N>> {
static OwnPtr<typename Gfx::SpatialGaussianBlurFilter<N>::Parameters> get()
{
constexpr static ssize_t offset = N / 2;
Matrix<N, float> kernel;
auto sigma = 1.0f;
auto s = 2.0f * sigma * sigma;
for (auto x = -(ssize_t)N / 2; x <= (ssize_t)N / 2; x++) {
for (auto y = -(ssize_t)N / 2; y <= (ssize_t)N / 2; y++) {
for (auto x = -offset; x <= offset; x++) {
for (auto y = -offset; y <= offset; y++) {
auto r = sqrt(x * x + y * y);
kernel.elements()[x + 2][y + 2] = (exp(-(r * r) / s)) / (M_PI * s);
kernel.elements()[x + offset][y + offset] = (exp(-(r * r) / s)) / (M_PI * s);
}
}