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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <fcntl.h>
#include <math.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
USAGE("[-axyz] operation right-hand-stream")
static int skip_a = 0;
static int skip_x = 0;
static int skip_y = 0;
static int skip_z = 0;
/* Because the syntax for a function returning a function pointer is disgusting. */
typedef void (*process_func)(struct stream *left, struct stream *right, size_t n);
#define LIST_OPERATORS(PIXFMT, TYPE, SUFFIX)\
X(add, *lh += rh, PIXFMT, TYPE)\
X(sub, *lh -= rh, PIXFMT, TYPE)\
X(mul, *lh *= rh, PIXFMT, TYPE)\
X(div, *lh /= rh, PIXFMT, TYPE)\
X(exp, *lh = pow##SUFFIX(*lh, rh), PIXFMT, TYPE)\
X(log, *lh = log##SUFFIX(*lh) / log##SUFFIX(rh), PIXFMT, TYPE)\
X(min, *lh = MIN(*lh, rh), PIXFMT, TYPE)\
X(max, *lh = MAX(*lh, rh), PIXFMT, TYPE)\
X(abs, *lh = fabs##SUFFIX(*lh - rh) + rh, PIXFMT, TYPE)
#define C(CH, CHI, ALGO, TYPE)\
(!skip_##CH ? ((lh = ((TYPE *)(left->buf + i)) + (CHI),\
rh = ((TYPE *)(right->buf + i))[CHI],\
(ALGO)), 0) : 0)
#define X(NAME, ALGO, PIXFMT, TYPE)\
static void\
process_##PIXFMT##_##NAME(struct stream *left, struct stream *right, size_t n)\
{\
size_t i;\
TYPE *lh, rh;\
for (i = 0; i < n; i += 4 * sizeof(TYPE)) {\
C(x, 0, ALGO, TYPE);\
C(y, 1, ALGO, TYPE);\
C(z, 2, ALGO, TYPE);\
C(a, 3, ALGO, TYPE);\
}\
}
LIST_OPERATORS(xyza, double,)
LIST_OPERATORS(xyzaf, float, f)
#undef X
static process_func
get_process_xyza(const char *operation)
{
#define X(NAME, ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(xyza, double,)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
static process_func
get_process_xyzaf(const char *operation)
{
#define X(NAME, ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(xyzaf, float, f)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
int
main(int argc, char *argv[])
{
struct stream left, right;
process_func process = NULL;
ARGBEGIN {
case 'a':
skip_a = 1;
break;
case 'x':
skip_x = 1;
break;
case 'y':
skip_y = 1;
break;
case 'z':
skip_z = 1;
break;
default:
usage();
} ARGEND;
if (argc != 2)
usage();
eopen_stream(&left, NULL);
eopen_stream(&right, argv[1]);
if (!strcmp(left.pixfmt, "xyza"))
process = get_process_xyza(argv[0]);
else if (!strcmp(left.pixfmt, "xyza f"))
process = get_process_xyzaf(argv[0]);
else
eprintf("pixel format %s is not supported, try xyza\n", left.pixfmt);
fprint_stream_head(stdout, &left);
efflush(stdout, "<stdout>");
process_two_streams(&left, &right, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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