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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")
#define PROCESS(TYPE)\
do {\
size_t i;\
TYPE s, *x, y, *z;\
for (i = 0; i < n; i += colour->pixel_size) {\
s = ((TYPE *)(satur->buf + i))[1];\
s *= ((TYPE *)(satur->buf + i))[3];\
x = ((TYPE *)(colour->buf + i)) + 0;\
y = ((TYPE *)(colour->buf + i))[1];\
z = ((TYPE *)(colour->buf + i)) + 2;\
*x = ((*x / (TYPE)D65_XYZ_X - y) * s + y) * (TYPE)D65_XYZ_X;\
*z = ((*z / (TYPE)D65_XYZ_Z - y) * s + y) * (TYPE)D65_XYZ_Z;\
/*
* Explaination:
* Y is the luma and ((X / Xn - Y / Yn), (Z / Zn - Y / Yn))
* is the chroma (according to CIELAB), where (Xn, Yn, Zn)
* is the white point.
*/\
}\
} while (0)
#define PROCESS_W(TYPE)\
do {\
size_t i;\
TYPE s, *x, y, *z, X, Z;\
for (i = 0; i < n; i += colour->pixel_size) {\
X = ((TYPE *)(satur->buf + i))[0];\
Z = ((TYPE *)(satur->buf + i))[2];\
s = ((TYPE *)(satur->buf + i))[1];\
s *= ((TYPE *)(satur->buf + i))[3];\
x = ((TYPE *)(colour->buf + i)) + 0;\
y = ((TYPE *)(colour->buf + i))[1];\
z = ((TYPE *)(colour->buf + i)) + 2;\
*x = ((*x / X - y) * s + y) * X;\
*z = ((*z / Z - y) * s + y) * Z;\
}\
} while (0)
static void process_xyza (struct stream *colour, struct stream *satur, size_t n) {PROCESS(double);}
static void process_xyza_w (struct stream *colour, struct stream *satur, size_t n) {PROCESS_W(double);}
static void process_xyzaf (struct stream *colour, struct stream *satur, size_t n) {PROCESS(float);}
static void process_xyzaf_w(struct stream *colour, struct stream *satur, size_t n) {PROCESS_W(float);}
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();
eopen_stream(&colour, NULL);
eopen_stream(&satur, argv[0]);
if (!strcmp(colour.pixfmt, "xyza"))
process = whitepoint ? process_xyza_w : process_xyza;
else if (!strcmp(colour.pixfmt, "xyza f"))
process = whitepoint ? process_xyzaf_w : process_xyzaf;
else
eprintf("pixel format %s is not supported, try xyza\n", colour.pixfmt);
fprint_stream_head(stdout, &colour);
efflush(stdout, "<stdout>");
process_two_streams(&colour, &satur, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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