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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 rgblevels_1c(const float pixel, global const float *levels, const float inv_gamma, read_only image2d_t lut)
{
float level;
if(pixel <= levels[0])
{
// Anything below the lower threshold just clips to zero
level = 0.0f;
}
else if(pixel >= levels[2])
{
const float percentage = (pixel - levels[0]) / (levels[2] - levels[0]);
level = dtcl_pow(percentage, inv_gamma);
}
else
{
// Within the expected input range we can use the lookup table
const float percentage = (pixel - levels[0]) / (levels[2] - levels[0]);
level = lookup(lut, percentage);
}
return level;
}
kernel void
rgblevels (read_only image2d_t in, write_only image2d_t out, const int width, const int height,
const int autoscale, const int preserve_colors,
read_only image2d_t lutr, read_only image2d_t lutg, read_only image2d_t lutb,
global const float (*const levels)[3], global const float *inv_gamma,
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 || preserve_colors == DT_RGB_NORM_NONE) // autoscale == DT_IOP_RGBLEVELS_INDEPENDENT_CHANNELS
{
pixel.x = rgblevels_1c(pixel.x, levels[0], inv_gamma[0], lutr);
pixel.y = rgblevels_1c(pixel.y, levels[1], inv_gamma[1], lutg);
pixel.z = rgblevels_1c(pixel.z, levels[2], inv_gamma[2], lutb);
}
else
{
float ratio = 0.f;
const float lum = dt_rgb_norm(pixel, preserve_colors, use_work_profile, profile_info, lut);
if(lum > levels[0][0])
{
const float curve_lum = rgblevels_1c(lum, levels[0], inv_gamma[0], lutr);
ratio = curve_lum / lum;
}
pixel.xyz *= ratio;
}
write_imagef (out, (int2)(x, y), pixel);
}
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