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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_ColorBalanceLGGOperation.h"
namespace blender::compositor {
inline float colorbalance_lgg(float in, float lift_lgg, float gamma_inv, float gain)
{
/* 1:1 match with the sequencer with linear/srgb conversions, the conversion isn't pretty
* but best keep it this way, since testing for durian shows a similar calculation
* without lin/srgb conversions gives bad results (over-saturated shadows) with colors
* slightly below 1.0. some correction can be done but it ends up looking bad for shadows or
* lighter tones - campbell */
float x = (((linearrgb_to_srgb(in) - 1.0f) * lift_lgg) + 1.0f) * gain;
/* prevent NaN */
if (x < 0.0f) {
x = 0.0f;
}
return powf(srgb_to_linearrgb(x), gamma_inv);
}
ColorBalanceLGGOperation::ColorBalanceLGGOperation()
{
this->addInputSocket(DataType::Value);
this->addInputSocket(DataType::Color);
this->addOutputSocket(DataType::Color);
inputValueOperation_ = nullptr;
inputColorOperation_ = nullptr;
this->set_canvas_input_index(1);
flags.can_be_constant = true;
}
void ColorBalanceLGGOperation::initExecution()
{
inputValueOperation_ = this->getInputSocketReader(0);
inputColorOperation_ = this->getInputSocketReader(1);
}
void ColorBalanceLGGOperation::executePixelSampled(float output[4],
float x,
float y,
PixelSampler sampler)
{
float inputColor[4];
float value[4];
inputValueOperation_->readSampled(value, x, y, sampler);
inputColorOperation_->readSampled(inputColor, x, y, sampler);
float fac = value[0];
fac = MIN2(1.0f, fac);
const float mfac = 1.0f - fac;
output[0] = mfac * inputColor[0] +
fac * colorbalance_lgg(inputColor[0], lift_[0], gamma_inv_[0], gain_[0]);
output[1] = mfac * inputColor[1] +
fac * colorbalance_lgg(inputColor[1], lift_[1], gamma_inv_[1], gain_[1]);
output[2] = mfac * inputColor[2] +
fac * colorbalance_lgg(inputColor[2], lift_[2], gamma_inv_[2], gain_[2]);
output[3] = inputColor[3];
}
void ColorBalanceLGGOperation::update_memory_buffer_row(PixelCursor &p)
{
for (; p.out < p.row_end; p.next()) {
const float *in_factor = p.ins[0];
const float *in_color = p.ins[1];
const float fac = MIN2(1.0f, in_factor[0]);
const float fac_m = 1.0f - fac;
p.out[0] = fac_m * in_color[0] +
fac * colorbalance_lgg(in_color[0], lift_[0], gamma_inv_[0], gain_[0]);
p.out[1] = fac_m * in_color[1] +
fac * colorbalance_lgg(in_color[1], lift_[1], gamma_inv_[1], gain_[1]);
p.out[2] = fac_m * in_color[2] +
fac * colorbalance_lgg(in_color[2], lift_[2], gamma_inv_[2], gain_[2]);
p.out[3] = in_color[3];
}
}
void ColorBalanceLGGOperation::deinitExecution()
{
inputValueOperation_ = nullptr;
inputColorOperation_ = nullptr;
}
} // namespace blender::compositor
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