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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 2011, Blender Foundation.
*/
#include "COM_GammaOperation.h"
namespace blender::compositor {
GammaOperation::GammaOperation()
{
this->add_input_socket(DataType::Color);
this->add_input_socket(DataType::Value);
this->add_output_socket(DataType::Color);
input_program_ = nullptr;
input_gamma_program_ = nullptr;
flags_.can_be_constant = true;
}
void GammaOperation::init_execution()
{
input_program_ = this->get_input_socket_reader(0);
input_gamma_program_ = this->get_input_socket_reader(1);
}
void GammaOperation::execute_pixel_sampled(float output[4], float x, float y, PixelSampler sampler)
{
float input_value[4];
float input_gamma[4];
input_program_->read_sampled(input_value, x, y, sampler);
input_gamma_program_->read_sampled(input_gamma, x, y, sampler);
const float gamma = input_gamma[0];
/* check for negative to avoid nan's */
output[0] = input_value[0] > 0.0f ? powf(input_value[0], gamma) : input_value[0];
output[1] = input_value[1] > 0.0f ? powf(input_value[1], gamma) : input_value[1];
output[2] = input_value[2] > 0.0f ? powf(input_value[2], gamma) : input_value[2];
output[3] = input_value[3];
}
void GammaOperation::update_memory_buffer_row(PixelCursor &p)
{
for (; p.out < p.row_end; p.next()) {
const float *in_value = p.ins[0];
const float *in_gamma = p.ins[1];
const float gamma = in_gamma[0];
/* Check for negative to avoid nan's. */
p.out[0] = in_value[0] > 0.0f ? powf(in_value[0], gamma) : in_value[0];
p.out[1] = in_value[1] > 0.0f ? powf(in_value[1], gamma) : in_value[1];
p.out[2] = in_value[2] > 0.0f ? powf(in_value[2], gamma) : in_value[2];
p.out[3] = in_value[3];
}
}
void GammaOperation::deinit_execution()
{
input_program_ = nullptr;
input_gamma_program_ = nullptr;
}
} // namespace blender::compositor
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