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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);
}
}

20
Libraries/LibGfx/Filters/GenericConvolutionFilter.h
View file

@ -73,6 +73,7 @@ public:
class ApplyCache {
template<size_t>
friend class GenericConvolutionFilter;
private:
RefPtr<Gfx::Bitmap> m_target;
};
@ -120,23 +121,24 @@ public:
Bitmap* render_target_bitmap = (&target != &source) ? &target : apply_cache.m_target.ptr();
// FIXME: Help! I am naive!
constexpr static ssize_t offset = N / 2;
for (auto i_ = 0; i_ < target_rect.width(); ++i_) {
auto i = i_ + target_rect.x();
ssize_t i = i_ + target_rect.x();
for (auto j_ = 0; j_ < target_rect.height(); ++j_) {
auto j = j_ + target_rect.y();
ssize_t j = j_ + target_rect.y();
FloatVector3 value(0, 0, 0);
for (auto k = 0; k < 4; ++k) {
auto ki = i + k - 2;
if (i < source_rect.x() || i > source_rect.right()) {
for (auto k = 0l; k < (ssize_t)N; ++k) {
auto ki = i + k - offset;
if (ki < source_rect.x() || ki > source_rect.right()) {
if (parameters.should_wrap())
ki = (ki + source.size().width()) % source.size().width(); // TODO: fix up using source_rect
else
continue;
}
for (auto l = 0; l < 4; ++l) {
auto lj = j + l - 2;
if (j < source_rect.y() || j > source_rect.bottom()) {
for (auto l = 0l; l < (ssize_t)N; ++l) {
auto lj = j + l - offset;
if (lj < source_rect.y() || lj > source_rect.bottom()) {
if (parameters.should_wrap())
lj = (lj + source.size().height()) % source.size().height(); // TODO: fix up using source_rect
else
@ -150,7 +152,7 @@ public:
}
}
// The float->u8 overflow is intentional.
value.clamp(0, 255);
render_target_bitmap->set_pixel(i, j, Color(value.x(), value.y(), value.z(), source.get_pixel(i + source_delta_x, j + source_delta_y).alpha()));
}
}

17
Libraries/LibGfx/Vector3.h
View file

@ -87,6 +87,23 @@ public:
return *this * inv_length;
}
Vector3 clamped(T m, T x) const
{
Vector3 copy { *this };
copy.clamp(m, x);
return copy;
}
void clamp(T min_value, T max_value)
{
m_x = max(min_value, m_x);
m_y = max(min_value, m_y);
m_z = max(min_value, m_z);
m_x = min(max_value, m_x);
m_y = min(max_value, m_y);
m_z = min(max_value, m_z);
}
void normalize()
{
T inv_length = 1 / length();