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/* See LICENSE file for copyright and license details. */
#include "common.h"
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic ignored "-Wunsuffixed-float-constants"
#endif
void
libglitter_desaturate_double(double **rasters, size_t nrasters, size_t rowsize, size_t cellsize,
size_t width, size_t height, double saturation, const double *primary_ys)
{
size_t y, x, ch, raster_y, raster_i;
double intensity;
rowsize *= cellsize;
if (nrasters == 3) {
double *raster1 = rasters[0];
double *raster2 = rasters[1];
double *raster3 = rasters[2];
double primary1_y = primary_ys ? primary_ys[0] : (double)0.212673370378408277403536885686;
double primary2_y = primary_ys ? primary_ys[1] : (double)0.715151730491031756287156895269;
double primary3_y = primary_ys ? primary_ys[2] : (double)0.072174899130559869164791564344;
for (y = 0, raster_y = 0; y < height; y++, raster_y += rowsize) {
for (x = 0, raster_i = raster_y; x < width; x++, raster_i += cellsize) {
intensity = raster1[raster_i] * primary1_y;
intensity += raster2[raster_i] * primary2_y;
intensity += raster3[raster_i] * primary3_y;
raster1[raster_i] = fma(raster1[raster_i] - intensity, saturation, intensity);
raster2[raster_i] = fma(raster2[raster_i] - intensity, saturation, intensity);
raster3[raster_i] = fma(raster3[raster_i] - intensity, saturation, intensity);
}
}
} else {
for (y = 0, raster_y = 0; y < height; y++, raster_y += rowsize) {
for (x = 0, raster_i = raster_y; x < width; x++, raster_i += cellsize) {
intensity = 0;
for (ch = 0; ch < nrasters; ch++)
intensity += rasters[ch][raster_i] * primary_ys[ch];
for (ch = 0; ch < nrasters; ch++)
rasters[ch][raster_i] = fma(rasters[ch][raster_i] - intensity, saturation, intensity);
}
}
}
}
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