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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
USAGE("[-w] saturation-stream")
static void
process_xyza(struct stream *colour, struct stream *satur, size_t n)
{
size_t i;
double s, *x, *z, X, Z;
X = D65_XYY_X / D65_XYY_Y;
Z = 1 / D65_XYY_Y - 1 - X;
for (i = 0; i < n; i += colour->pixel_size) {
s = ((double *)(satur->buf + i))[1];
s *= ((double *)(satur->buf + i))[3];
x = ((double *)(colour->buf + i)) + 0;
z = ((double *)(colour->buf + i)) + 2;
*x = (*x - X) * s + X;
*z = (*z - Z) * s + Z;
}
}
static void
process_xyza_w(struct stream *colour, struct stream *satur, size_t n)
{
size_t i;
double s, *x, *z, X, Z;
for (i = 0; i < n; i += colour->pixel_size) {
X = ((double *)(satur->buf + i))[0];
Z = ((double *)(satur->buf + i))[2];
s = ((double *)(satur->buf + i))[1];
s *= ((double *)(satur->buf + i))[3];
x = ((double *)(colour->buf + i)) + 0;
z = ((double *)(colour->buf + i)) + 2;
*x = (*x - X) * s + X;
*z = (*z - Z) * s + Z;
}
}
int
main(int argc, char *argv[])
{
struct stream colour, satur;
int whitepoint = 0;
void (*process)(struct stream *colour, struct stream *satur, size_t n) = NULL;
ARGBEGIN {
case 'w':
whitepoint = 1;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
colour.file = "<stdin>";
colour.fd = STDIN_FILENO;
einit_stream(&colour);
satur.file = argv[0];
satur.fd = eopen(satur.file, O_RDONLY);
einit_stream(&satur);
if (!strcmp(colour.pixfmt, "xyza"))
process = whitepoint ? process_xyza_w : process_xyza;
else
eprintf("pixel format %s is not supported, try xyza\n", colour.pixfmt);
process_two_streams(&colour, &satur, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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