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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_BilateralBlurOperation.h"
namespace blender::compositor {
BilateralBlurOperation::BilateralBlurOperation()
{
this->add_input_socket(DataType::Color);
this->add_input_socket(DataType::Color);
this->add_output_socket(DataType::Color);
flags_.complex = true;
input_color_program_ = nullptr;
input_determinator_program_ = nullptr;
}
void BilateralBlurOperation::init_execution()
{
input_color_program_ = get_input_socket_reader(0);
input_determinator_program_ = get_input_socket_reader(1);
QualityStepHelper::init_execution(COM_QH_INCREASE);
}
void BilateralBlurOperation::execute_pixel(float output[4], int x, int y, void *data)
{
/* Read the determinator color at x, y,
* this will be used as the reference color for the determinator. */
float determinator_reference_color[4];
float determinator[4];
float temp_color[4];
float blur_color[4];
float blur_divider;
float space = space_;
float sigmacolor = data_->sigma_color;
int minx = floor(x - space);
int maxx = ceil(x + space);
int miny = floor(y - space);
int maxy = ceil(y + space);
float delta_color;
input_determinator_program_->read(determinator_reference_color, x, y, data);
zero_v4(blur_color);
blur_divider = 0.0f;
/* TODO(sergey): This isn't really good bilateral filter, it should be
* using gaussian bell for weights. Also sigma_color doesn't seem to be
* used correct at all.
*/
for (int yi = miny; yi < maxy; yi += QualityStepHelper::get_step()) {
for (int xi = minx; xi < maxx; xi += QualityStepHelper::get_step()) {
/* Read determinator. */
input_determinator_program_->read(determinator, xi, yi, data);
delta_color = (fabsf(determinator_reference_color[0] - determinator[0]) +
fabsf(determinator_reference_color[1] - determinator[1]) +
/* Do not take the alpha channel into account. */
fabsf(determinator_reference_color[2] - determinator[2]));
if (delta_color < sigmacolor) {
/* Add this to the blur. */
input_color_program_->read(temp_color, xi, yi, data);
add_v4_v4(blur_color, temp_color);
blur_divider += 1.0f;
}
}
}
if (blur_divider > 0.0f) {
mul_v4_v4fl(output, blur_color, 1.0f / blur_divider);
}
else {
output[0] = 0.0f;
output[1] = 0.0f;
output[2] = 0.0f;
output[3] = 1.0f;
}
}
void BilateralBlurOperation::deinit_execution()
{
input_color_program_ = nullptr;
input_determinator_program_ = nullptr;
}
bool BilateralBlurOperation::determine_depending_area_of_interest(
rcti *input, ReadBufferOperation *read_operation, rcti *output)
{
rcti new_input;
int add = ceil(space_) + 1;
new_input.xmax = input->xmax + (add);
new_input.xmin = input->xmin - (add);
new_input.ymax = input->ymax + (add);
new_input.ymin = input->ymin - (add);
return NodeOperation::determine_depending_area_of_interest(&new_input, read_operation, output);
}
void BilateralBlurOperation::get_area_of_interest(const int /*input_idx*/,
const rcti &output_area,
rcti &r_input_area)
{
const int add = ceil(space_) + 1;
r_input_area.xmax = output_area.xmax + (add);
r_input_area.xmin = output_area.xmin - (add);
r_input_area.ymax = output_area.ymax + (add);
r_input_area.ymin = output_area.ymin - (add);
}
struct PixelCursor {
MemoryBuffer *input_determinator;
MemoryBuffer *input_color;
int step;
float sigma_color;
const float *determ_reference_color;
float temp_color[4];
float *out;
int min_x, max_x;
int min_y, max_y;
};
static void blur_pixel(PixelCursor &p)
{
float blur_divider = 0.0f;
zero_v4(p.out);
/* TODO(sergey): This isn't really good bilateral filter, it should be
* using gaussian bell for weights. Also sigma_color doesn't seem to be
* used correct at all.
*/
for (int yi = p.min_y; yi < p.max_y; yi += p.step) {
for (int xi = p.min_x; xi < p.max_x; xi += p.step) {
p.input_determinator->read(p.temp_color, xi, yi);
/* Do not take the alpha channel into account. */
const float delta_color = (fabsf(p.determ_reference_color[0] - p.temp_color[0]) +
fabsf(p.determ_reference_color[1] - p.temp_color[1]) +
fabsf(p.determ_reference_color[2] - p.temp_color[2]));
if (delta_color < p.sigma_color) {
/* Add this to the blur. */
p.input_color->read(p.temp_color, xi, yi);
add_v4_v4(p.out, p.temp_color);
blur_divider += 1.0f;
}
}
}
if (blur_divider > 0.0f) {
mul_v4_fl(p.out, 1.0f / blur_divider);
}
else {
copy_v4_v4(p.out, COM_COLOR_BLACK);
}
}
void BilateralBlurOperation::update_memory_buffer_partial(MemoryBuffer *output,
const rcti &area,
Span<MemoryBuffer *> inputs)
{
PixelCursor p = {};
p.step = QualityStepHelper::get_step();
p.sigma_color = data_->sigma_color;
p.input_color = inputs[0];
p.input_determinator = inputs[1];
const float space = space_;
for (int y = area.ymin; y < area.ymax; y++) {
p.out = output->get_elem(area.xmin, y);
/* This will be used as the reference color for the determinator. */
p.determ_reference_color = p.input_determinator->get_elem(area.xmin, y);
p.min_y = floor(y - space);
p.max_y = ceil(y + space);
for (int x = area.xmin; x < area.xmax; x++) {
p.min_x = floor(x - space);
p.max_x = ceil(x + space);
blur_pixel(p);
p.determ_reference_color += p.input_determinator->elem_stride;
p.out += output->elem_stride;
}
}
}
} // namespace blender::compositor
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