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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"
kernel void
rgbcurve(read_only image2d_t in, write_only image2d_t out, const int width, const int height,
read_only image2d_t table_r, read_only image2d_t table_g, read_only image2d_t table_b,
constant float *coeffs_r, constant float *coeffs_g, constant float *coeffs_b,
const int autoscale, const int preserve_colors,
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));
if(autoscale == 1) // DT_S_SCALE_MANUAL_RGB
{
pixel.x = lookup_unbounded(table_r, pixel.x, coeffs_r);
pixel.y = lookup_unbounded(table_g, pixel.y, coeffs_g);
pixel.z = lookup_unbounded(table_b, pixel.z, coeffs_b);
}
else if(autoscale == 0) // DT_S_SCALE_AUTOMATIC_RGB
{
if (preserve_colors == DT_RGB_NORM_NONE)
{
pixel.x = lookup_unbounded(table_r, pixel.x, coeffs_r);
pixel.y = lookup_unbounded(table_r, pixel.y, coeffs_r);
pixel.z = lookup_unbounded(table_r, pixel.z, coeffs_r);
}
else
{
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 curve_lum = lookup_unbounded(table_r, lum, coeffs_r);
ratio = curve_lum / lum;
}
pixel.xyz *= ratio;
}
}
write_imagef(out, (int2)(x, y), pixel);
}
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