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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_ProjectorLensDistortionOperation.h"
#include "COM_ConstantOperation.h"
namespace blender::compositor {
ProjectorLensDistortionOperation::ProjectorLensDistortionOperation()
{
this->add_input_socket(DataType::Color);
this->add_input_socket(DataType::Value);
this->add_output_socket(DataType::Color);
flags_.complex = true;
input_program_ = nullptr;
dispersion_available_ = false;
dispersion_ = 0.0f;
}
void ProjectorLensDistortionOperation::init_data()
{
if (execution_model_ == eExecutionModel::FullFrame) {
NodeOperation *dispersion_input = get_input_operation(1);
if (dispersion_input->get_flags().is_constant_operation) {
dispersion_ = static_cast<ConstantOperation *>(dispersion_input)->get_constant_elem()[0];
}
kr_ = 0.25f * max_ff(min_ff(dispersion_, 1.0f), 0.0f);
kr2_ = kr_ * 20;
}
}
void ProjectorLensDistortionOperation::init_execution()
{
this->init_mutex();
input_program_ = this->get_input_socket_reader(0);
}
void *ProjectorLensDistortionOperation::initialize_tile_data(rcti * /*rect*/)
{
update_dispersion();
void *buffer = input_program_->initialize_tile_data(nullptr);
return buffer;
}
void ProjectorLensDistortionOperation::execute_pixel(float output[4], int x, int y, void *data)
{
float input_value[4];
const float height = this->get_height();
const float width = this->get_width();
const float v = (y + 0.5f) / height;
const float u = (x + 0.5f) / width;
MemoryBuffer *input_buffer = (MemoryBuffer *)data;
input_buffer->read_bilinear(input_value, (u * width + kr2_) - 0.5f, v * height - 0.5f);
output[0] = input_value[0];
input_buffer->read(input_value, x, y);
output[1] = input_value[1];
input_buffer->read_bilinear(input_value, (u * width - kr2_) - 0.5f, v * height - 0.5f);
output[2] = input_value[2];
output[3] = 1.0f;
}
void ProjectorLensDistortionOperation::deinit_execution()
{
this->deinit_mutex();
input_program_ = nullptr;
}
bool ProjectorLensDistortionOperation::determine_depending_area_of_interest(
rcti *input, ReadBufferOperation *read_operation, rcti *output)
{
rcti new_input;
if (dispersion_available_) {
new_input.ymax = input->ymax;
new_input.ymin = input->ymin;
new_input.xmin = input->xmin - kr2_ - 2;
new_input.xmax = input->xmax + kr2_ + 2;
}
else {
rcti disp_input;
BLI_rcti_init(&disp_input, 0, 5, 0, 5);
if (this->get_input_operation(1)->determine_depending_area_of_interest(
&disp_input, read_operation, output)) {
return true;
}
new_input.xmin = input->xmin - 7; /* (0.25f * 20 * 1) + 2 == worse case dispersion */
new_input.ymin = input->ymin;
new_input.ymax = input->ymax;
new_input.xmax = input->xmax + 7; /* (0.25f * 20 * 1) + 2 == worse case dispersion */
}
if (this->get_input_operation(0)->determine_depending_area_of_interest(
&new_input, read_operation, output)) {
return true;
}
return false;
}
/* TODO(manzanilla): to be removed with tiled implementation. */
void ProjectorLensDistortionOperation::update_dispersion()
{
if (dispersion_available_) {
return;
}
this->lock_mutex();
if (!dispersion_available_) {
float result[4];
this->get_input_socket_reader(1)->read_sampled(result, 1, 1, PixelSampler::Nearest);
dispersion_ = result[0];
kr_ = 0.25f * max_ff(min_ff(dispersion_, 1.0f), 0.0f);
kr2_ = kr_ * 20;
dispersion_available_ = true;
}
this->unlock_mutex();
}
void ProjectorLensDistortionOperation::determine_canvas(const rcti &preferred_area, rcti &r_area)
{
switch (execution_model_) {
case eExecutionModel::FullFrame: {
set_determined_canvas_modifier([=](rcti &canvas) {
/* Ensure screen space. */
BLI_rcti_translate(&canvas, -canvas.xmin, -canvas.ymin);
});
break;
}
default:
break;
}
NodeOperation::determine_canvas(preferred_area, r_area);
}
void ProjectorLensDistortionOperation::get_area_of_interest(const int input_idx,
const rcti &output_area,
rcti &r_input_area)
{
if (input_idx == 1) {
/* Dispersion input is used as constant only. */
r_input_area = COM_CONSTANT_INPUT_AREA_OF_INTEREST;
return;
}
r_input_area.ymax = output_area.ymax;
r_input_area.ymin = output_area.ymin;
r_input_area.xmin = output_area.xmin - kr2_ - 2;
r_input_area.xmax = output_area.xmax + kr2_ + 2;
}
void ProjectorLensDistortionOperation::update_memory_buffer_partial(MemoryBuffer *output,
const rcti &area,
Span<MemoryBuffer *> inputs)
{
const MemoryBuffer *input_image = inputs[0];
const float height = this->get_height();
const float width = this->get_width();
float color[4];
for (BuffersIterator<float> it = output->iterate_with({}, area); !it.is_end(); ++it) {
const float v = (it.y + 0.5f) / height;
const float u = (it.x + 0.5f) / width;
input_image->read_elem_bilinear((u * width + kr2_) - 0.5f, v * height - 0.5f, color);
it.out[0] = color[0];
input_image->read_elem(it.x, it.y, color);
it.out[1] = color[1];
input_image->read_elem_bilinear((u * width - kr2_) - 0.5f, v * height - 0.5f, color);
it.out[2] = color[2];
it.out[3] = 1.0f;
}
}
} // namespace blender::compositor
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