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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2021, Blender Foundation.
*/
#include "COM_GaussianAlphaBlurBaseOperation.h"
namespace blender::compositor {
GaussianAlphaBlurBaseOperation::GaussianAlphaBlurBaseOperation(eDimension dim)
: BlurBaseOperation(DataType::Value)
{
gausstab_ = nullptr;
filtersize_ = 0;
falloff_ = -1; /* Intentionally invalid, so we can detect uninitialized values. */
dimension_ = dim;
}
void GaussianAlphaBlurBaseOperation::init_data()
{
BlurBaseOperation::init_data();
if (execution_model_ == eExecutionModel::FullFrame) {
rad_ = max_ff(size_ * this->get_blur_size(dimension_), 0.0f);
rad_ = min_ff(rad_, MAX_GAUSSTAB_RADIUS);
filtersize_ = min_ii(ceil(rad_), MAX_GAUSSTAB_RADIUS);
}
}
void GaussianAlphaBlurBaseOperation::init_execution()
{
BlurBaseOperation::init_execution();
if (execution_model_ == eExecutionModel::FullFrame) {
gausstab_ = BlurBaseOperation::make_gausstab(rad_, filtersize_);
distbuf_inv_ = BlurBaseOperation::make_dist_fac_inverse(rad_, filtersize_, falloff_);
}
}
void GaussianAlphaBlurBaseOperation::deinit_execution()
{
BlurBaseOperation::deinit_execution();
if (gausstab_) {
MEM_freeN(gausstab_);
gausstab_ = nullptr;
}
if (distbuf_inv_) {
MEM_freeN(distbuf_inv_);
distbuf_inv_ = nullptr;
}
}
void GaussianAlphaBlurBaseOperation::get_area_of_interest(const int input_idx,
const rcti &output_area,
rcti &r_input_area)
{
if (input_idx != IMAGE_INPUT_INDEX) {
BlurBaseOperation::get_area_of_interest(input_idx, output_area, r_input_area);
return;
}
r_input_area = output_area;
switch (dimension_) {
case eDimension::X:
r_input_area.xmin = output_area.xmin - filtersize_ - 1;
r_input_area.xmax = output_area.xmax + filtersize_ + 1;
break;
case eDimension::Y:
r_input_area.ymin = output_area.ymin - filtersize_ - 1;
r_input_area.ymax = output_area.ymax + filtersize_ + 1;
break;
}
}
void GaussianAlphaBlurBaseOperation::update_memory_buffer_partial(MemoryBuffer *output,
const rcti &area,
Span<MemoryBuffer *> inputs)
{
MemoryBuffer *input = inputs[IMAGE_INPUT_INDEX];
const rcti &input_rect = input->get_rect();
BuffersIterator<float> it = output->iterate_with({input}, area);
int min_input_coord = -1;
int max_input_coord = -1;
int elem_stride = -1;
std::function<int()> get_current_coord;
switch (dimension_) {
case eDimension::X:
min_input_coord = input_rect.xmin;
max_input_coord = input_rect.xmax;
get_current_coord = [&] { return it.x; };
elem_stride = input->elem_stride;
break;
case eDimension::Y:
min_input_coord = input_rect.ymin;
max_input_coord = input_rect.ymax;
get_current_coord = [&] { return it.y; };
elem_stride = input->row_stride;
break;
}
for (; !it.is_end(); ++it) {
const int coord = get_current_coord();
const int coord_min = max_ii(coord - filtersize_, min_input_coord);
const int coord_max = min_ii(coord + filtersize_ + 1, max_input_coord);
/* *** This is the main part which is different to #GaussianBlurBaseOperation. *** */
/* Gauss. */
float alpha_accum = 0.0f;
float multiplier_accum = 0.0f;
/* Dilate. */
const bool do_invert = do_subtract_;
/* Init with the current color to avoid unneeded lookups. */
float value_max = finv_test(*it.in(0), do_invert);
float distfacinv_max = 1.0f; /* 0 to 1 */
const int step = QualityStepHelper::get_step();
const float *in = it.in(0) + ((intptr_t)coord_min - coord) * elem_stride;
const int in_stride = elem_stride * step;
int index = (coord_min - coord) + filtersize_;
const int index_end = index + (coord_max - coord_min);
for (; index < index_end; in += in_stride, index += step) {
float value = finv_test(*in, do_invert);
/* Gauss. */
float multiplier = gausstab_[index];
alpha_accum += value * multiplier;
multiplier_accum += multiplier;
/* Dilate - find most extreme color. */
if (value > value_max) {
multiplier = distbuf_inv_[index];
value *= multiplier;
if (value > value_max) {
value_max = value;
distfacinv_max = multiplier;
}
}
}
/* Blend between the max value and gauss blue - gives nice feather. */
const float value_blur = alpha_accum / multiplier_accum;
const float value_final = (value_max * distfacinv_max) +
(value_blur * (1.0f - distfacinv_max));
*it.out = finv_test(value_final, do_invert);
}
}
} // namespace blender::compositor
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