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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("palette-stream")
static double (*compare)(double x1, double y1, double z1, double a1, double x2, double y2, double z2, double a2);
/* TODO add more formulae: https://en.wikipedia.org/wiki/Color_difference */
static double
distance_xyz(double x1, double y1, double z1, double a1, double x2, double y2, double z2, double a2)
{
x2 -= x1, x2 *= x2;
y2 -= y1, y2 *= y2;
z2 -= z1, z2 *= z2;
a2 -= a1, a2 *= a2;
return sqrt(x2 + y2 + z2 + a2);
}
#define PROCESS(TYPE, SUFFIX)\
static void\
process_##SUFFIX(struct stream *stream, struct stream *palette, char *pal)\
{\
size_t i, j, n, m;\
size_t palsiz = palette->width * palette->height;\
size_t best = 0;\
TYPE x, y, z, a, lx = 0, ly = 0, lz = 0, la = 0;\
TYPE cx, cy, cz, ca;\
double distance, best_distance = 0;\
while (eread_frame(palette, pal)) {\
m = stream->frame_size;\
do {\
n = MIN(stream->ptr, m) / stream->pixel_size;\
for (i = 0; i < n; i++) {\
x = ((TYPE *)(stream->buf + i * stream->pixel_size))[0];\
y = ((TYPE *)(stream->buf + i * stream->pixel_size))[1];\
z = ((TYPE *)(stream->buf + i * stream->pixel_size))[2];\
a = ((TYPE *)(stream->buf + i * stream->pixel_size))[3];\
if ((!i && m == stream->frame_size) || x != lx || y != ly || z != lz || a != la) {\
for (j = 0; j < palsiz; j++) {\
cx = ((TYPE *)(pal + j * stream->pixel_size))[0];\
cy = ((TYPE *)(pal + j * stream->pixel_size))[1];\
cz = ((TYPE *)(pal + j * stream->pixel_size))[2];\
ca = ((TYPE *)(pal + j * stream->pixel_size))[3];\
distance = compare((double)x, (double)y, (double)z, (double)a,\
(double)cx, (double)cy, (double)cz, (double)ca);\
if (!j || distance < best_distance) {\
best_distance = distance;\
best = j;\
}\
}\
lx = x, ly = y, lz = z, la = a;\
}\
memcpy(stream->buf + i * stream->pixel_size,\
pal + best * stream->pixel_size,\
stream->pixel_size);\
}\
m -= n *= stream->pixel_size;\
ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>");\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (m && eread_stream(stream, SIZE_MAX));\
if (m)\
eprintf("%s: incomplete frame\n", stream->file);\
}\
}
PROCESS(double, lf)
PROCESS(float, f)
int
main(int argc, char *argv[])
{
struct stream stream, palette;
void (*process)(struct stream *stream, struct stream *palette, char *pal);
char *pal;
compare = distance_xyz;
UNOFLAGS(argc != 1);
eopen_stream(&stream, NULL);
eopen_stream(&palette, argv[0]);
if (!strcmp(stream.pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
if (strcmp(stream.pixfmt, palette.pixfmt))
eprintf("videos use incompatible pixel formats\n");
echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
echeck_dimensions(&palette, WIDTH | HEIGHT, NULL);
pal = emalloc(palette.frame_size);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process(&stream, &palette, pal);
free(pal);
return 0;
}
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