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/*
This file is part of darktable,
copyright (c) 2019 edgardo hoszowski.
darktable 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 3 of the License, or
(at your option) any later version.
darktable 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 darktable. If not, see <http://www.gnu.org/licenses/>.
*/
#include "color_conversion.h"
#include "rgb_norms.h"
float get_gamma(const float x, const float gamma)
{
return dtcl_pow(x, gamma);
}
float get_lut_gamma(const float x, const float gamma, read_only image2d_t lut)
{
if(x > 1.0f)
{
return get_gamma(x, gamma);
}
else
{
const int xi = clamp((int)(x * 0x10000ul), 0, 0xffff);
const int2 p = (int2)((xi & 0xff), (xi >> 8));
return read_imagef(lut, sampleri, p).x;
}
}
float get_contrast(const float x, const float contrast, const float middle_grey, const float inv_middle_grey)
{
return dtcl_pow(x * inv_middle_grey, contrast) * middle_grey;
}
float get_lut_contrast(const float x, const float contrast, const float middle_grey, const float inv_middle_grey, read_only image2d_t lut)
{
if(x > 1.0f)
{
return get_contrast(x, contrast, middle_grey, inv_middle_grey);
}
else
{
const int xi = clamp((int)(x * 0x10000ul), 0, 0xffff);
const int2 p = (int2)((xi & 0xff), (xi >> 8));
return read_imagef(lut, sampleri, p).x;
}
}
float hlcurve(const float level, const float hlcomp, const float hlrange)
{
if(hlcomp > 0.0f)
{
float val = level + (hlrange - 1.f);
// to avoid division by zero
if(val == 0.0f)
{
val = 0.000001f;
}
float Y = val / hlrange;
Y *= hlcomp;
// to avoid log(<=0)
if(Y <= -1.0f)
{
Y = -.999999f;
}
float R = hlrange / (val * hlcomp);
return log1p(Y) * R;
}
else
{
return 1.f;
}
}
kernel void
basicadj(read_only image2d_t in, write_only image2d_t out, const int width, const int height,
read_only image2d_t lut_gamma, read_only image2d_t lut_contrast,
const float black_point, const float scale,
const int process_gamma, const float gamma,
const int plain_contrast, const int preserve_colors, const float contrast,
const int process_saturation_vibrance, const float saturation, const float vibrance,
const int process_hlcompr, const float hlcomp, const float hlrange,
const float middle_grey, const float inv_middle_grey,
constant dt_colorspaces_iccprofile_info_cl_t *profile_info, read_only image2d_t lut,
const int use_work_profile)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
float4 pixel = read_imagef(in, sampleri, (int2)(x, y));
const float w = pixel.w;
// exposure
pixel = (pixel - black_point) * scale;
// highlight compression
if(process_hlcompr)
{
const float lum = (use_work_profile == 0) ? dt_camera_rgb_luminance(pixel): get_rgb_matrix_luminance(pixel, profile_info, profile_info->matrix_in, lut);
if(lum > 0.f)
{
const float ratio = hlcurve(lum, hlcomp, hlrange);
pixel *= ratio;
}
}
// gamma
if(process_gamma)
{
if(pixel.x > 0.f) pixel.x = get_lut_gamma(pixel.x, gamma, lut_gamma);
if(pixel.y > 0.f) pixel.y = get_lut_gamma(pixel.y, gamma, lut_gamma);
if(pixel.z > 0.f) pixel.z = get_lut_gamma(pixel.z, gamma, lut_gamma);
}
// contrast
if(plain_contrast)
{
if(pixel.x > 0.f) pixel.x = get_lut_contrast(pixel.x, contrast, middle_grey, inv_middle_grey, lut_contrast);
if(pixel.y > 0.f) pixel.y = get_lut_contrast(pixel.y, contrast, middle_grey, inv_middle_grey, lut_contrast);
if(pixel.z > 0.f) pixel.z = get_lut_contrast(pixel.z, contrast, middle_grey, inv_middle_grey, lut_contrast);
}
// contrast (with preserve colors)
if(preserve_colors != DT_RGB_NORM_NONE)
{
float ratio = 1.f;
const float lum = dt_rgb_norm(pixel, preserve_colors, use_work_profile, profile_info, lut);
if(lum > 0.f)
{
const float contrast_lum = dtcl_pow(lum / middle_grey, contrast) * middle_grey;
ratio = contrast_lum / lum;
}
pixel *= ratio;
}
// saturation
if(process_saturation_vibrance)
{
const float average = (pixel.x + pixel.y + pixel.z) / 3;
const float delta = fast_length(pixel - average);
const float P = vibrance * (1 - dtcl_pow(delta, fabs(vibrance)));
pixel = average + (saturation + P) * (pixel - average);
}
pixel.w = w;
write_imagef(out, (int2)(x, y), pixel);
}
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