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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_TonemapOperation.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "IMB_colormanagement.h"
namespace blender::compositor {
TonemapOperation::TonemapOperation()
{
this->addInputSocket(DataType::Color, ResizeMode::None);
this->addOutputSocket(DataType::Color);
this->m_imageReader = nullptr;
this->m_data = nullptr;
this->m_cachedInstance = nullptr;
this->flags.complex = true;
}
void TonemapOperation::initExecution()
{
this->m_imageReader = this->getInputSocketReader(0);
NodeOperation::initMutex();
}
void TonemapOperation::executePixel(float output[4], int x, int y, void *data)
{
AvgLogLum *avg = (AvgLogLum *)data;
this->m_imageReader->read(output, x, y, nullptr);
mul_v3_fl(output, avg->al);
float dr = output[0] + this->m_data->offset;
float dg = output[1] + this->m_data->offset;
float db = output[2] + this->m_data->offset;
output[0] /= ((dr == 0.0f) ? 1.0f : dr);
output[1] /= ((dg == 0.0f) ? 1.0f : dg);
output[2] /= ((db == 0.0f) ? 1.0f : db);
const float igm = avg->igm;
if (igm != 0.0f) {
output[0] = powf(MAX2(output[0], 0.0f), igm);
output[1] = powf(MAX2(output[1], 0.0f), igm);
output[2] = powf(MAX2(output[2], 0.0f), igm);
}
}
void PhotoreceptorTonemapOperation::executePixel(float output[4], int x, int y, void *data)
{
AvgLogLum *avg = (AvgLogLum *)data;
NodeTonemap *ntm = this->m_data;
const float f = expf(-this->m_data->f);
const float m = (ntm->m > 0.0f) ? ntm->m : (0.3f + 0.7f * powf(avg->auto_key, 1.4f));
const float ic = 1.0f - ntm->c, ia = 1.0f - ntm->a;
this->m_imageReader->read(output, x, y, nullptr);
const float L = IMB_colormanagement_get_luminance(output);
float I_l = output[0] + ic * (L - output[0]);
float I_g = avg->cav[0] + ic * (avg->lav - avg->cav[0]);
float I_a = I_l + ia * (I_g - I_l);
output[0] /= (output[0] + powf(f * I_a, m));
I_l = output[1] + ic * (L - output[1]);
I_g = avg->cav[1] + ic * (avg->lav - avg->cav[1]);
I_a = I_l + ia * (I_g - I_l);
output[1] /= (output[1] + powf(f * I_a, m));
I_l = output[2] + ic * (L - output[2]);
I_g = avg->cav[2] + ic * (avg->lav - avg->cav[2]);
I_a = I_l + ia * (I_g - I_l);
output[2] /= (output[2] + powf(f * I_a, m));
}
void TonemapOperation::deinitExecution()
{
this->m_imageReader = nullptr;
delete this->m_cachedInstance;
NodeOperation::deinitMutex();
}
bool TonemapOperation::determineDependingAreaOfInterest(rcti * /*input*/,
ReadBufferOperation *readOperation,
rcti *output)
{
rcti imageInput;
NodeOperation *operation = getInputOperation(0);
imageInput.xmax = operation->getWidth();
imageInput.xmin = 0;
imageInput.ymax = operation->getHeight();
imageInput.ymin = 0;
if (operation->determineDependingAreaOfInterest(&imageInput, readOperation, output)) {
return true;
}
return false;
}
void *TonemapOperation::initializeTileData(rcti *rect)
{
lockMutex();
if (this->m_cachedInstance == nullptr) {
MemoryBuffer *tile = (MemoryBuffer *)this->m_imageReader->initializeTileData(rect);
AvgLogLum *data = new AvgLogLum();
float *buffer = tile->getBuffer();
float lsum = 0.0f;
int p = tile->getWidth() * tile->getHeight();
float *bc = buffer;
float avl, maxl = -1e10f, minl = 1e10f;
const float sc = 1.0f / p;
float Lav = 0.0f;
float cav[4] = {0.0f, 0.0f, 0.0f, 0.0f};
while (p--) {
float L = IMB_colormanagement_get_luminance(bc);
Lav += L;
add_v3_v3(cav, bc);
lsum += logf(MAX2(L, 0.0f) + 1e-5f);
maxl = (L > maxl) ? L : maxl;
minl = (L < minl) ? L : minl;
bc += 4;
}
data->lav = Lav * sc;
mul_v3_v3fl(data->cav, cav, sc);
maxl = log((double)maxl + 1e-5);
minl = log((double)minl + 1e-5);
avl = lsum * sc;
data->auto_key = (maxl > minl) ? ((maxl - avl) / (maxl - minl)) : 1.0f;
float al = exp((double)avl);
data->al = (al == 0.0f) ? 0.0f : (this->m_data->key / al);
data->igm = (this->m_data->gamma == 0.0f) ? 1 : (1.0f / this->m_data->gamma);
this->m_cachedInstance = data;
}
unlockMutex();
return this->m_cachedInstance;
}
void TonemapOperation::deinitializeTileData(rcti * /*rect*/, void * /*data*/)
{
/* pass */
}
} // namespace blender::compositor
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