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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <string.h>
USAGE("[-iw] mask-stream")
#define PROCESS(TYPE, INV)\
do {\
size_t i;\
TYPE w, y, yo;\
for (i = 0; i < n; i += colour->pixel_size) {\
w = INV ((TYPE *)(mask->buf + i))[1];\
w *= ((TYPE *)(mask->buf + i))[3];\
yo = ((TYPE *)(colour->buf + i))[1];\
y = (1 - yo) * w + yo * (1 - w);\
((TYPE *)(colour->buf + i))[0] += (y - yo) * (TYPE)D65_XYZ_X;\
((TYPE *)(colour->buf + i))[1] = y;\
((TYPE *)(colour->buf + i))[2] += (y - yo) * (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, INV)\
do {\
size_t i;\
TYPE w, y, yo, X, Z;\
for (i = 0; i < n; i += colour->pixel_size) {\
X = ((TYPE *)(mask->buf + i))[0];\
Z = ((TYPE *)(mask->buf + i))[2];\
w = INV ((TYPE *)(mask->buf + i))[1];\
w *= ((TYPE *)(mask->buf + i))[3];\
yo = ((TYPE *)(colour->buf + i))[1];\
y = (1 - yo) * w + yo * (1 - w);\
((TYPE *)(colour->buf + i))[0] += (y - yo) * X;\
((TYPE *)(colour->buf + i))[1] = y;\
((TYPE *)(colour->buf + i))[2] += (y - yo) * Z;\
}\
} while (0)
static void process_xyza (struct stream *colour, struct stream *mask, size_t n) {PROCESS(double,);}
static void process_xyza_i (struct stream *colour, struct stream *mask, size_t n) {PROCESS(double, 1 -);}
static void process_xyza_w (struct stream *colour, struct stream *mask, size_t n) {PROCESS_W(double,);}
static void process_xyza_iw (struct stream *colour, struct stream *mask, size_t n) {PROCESS_W(double, 1 -);}
static void process_xyzaf (struct stream *colour, struct stream *mask, size_t n) {PROCESS(float,);}
static void process_xyzaf_i (struct stream *colour, struct stream *mask, size_t n) {PROCESS(float, 1 -);}
static void process_xyzaf_w (struct stream *colour, struct stream *mask, size_t n) {PROCESS_W(float,);}
static void process_xyzaf_iw(struct stream *colour, struct stream *mask, size_t n) {PROCESS_W(float, 1 -);}
int
main(int argc, char *argv[])
{
int invert = 0, whitepoint = 0;
struct stream colour, mask;
void (*process)(struct stream *colour, struct stream *mask, size_t n);
ARGBEGIN {
case 'i':
invert = 1;
break;
case 'w':
whitepoint = 1;
break;
default:
usage();
} ARGEND;
if (argc != 1)
usage();
eopen_stream(&colour, NULL);
eopen_stream(&mask, argv[0]);
if (!strcmp(colour.pixfmt, "xyza"))
process = invert ? whitepoint ? process_xyza_iw : process_xyza_i
: whitepoint ? process_xyza_w : process_xyza;
else if (!strcmp(colour.pixfmt, "xyza f"))
process = invert ? whitepoint ? process_xyzaf_iw : process_xyzaf_i
: 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, &mask, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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