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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("operation")
/* Because the syntax for a function returning a function pointer is disgusting. */
typedef void (*process_func)(struct stream *stream, void *image);
#define LIST_OPERATORS(PIXFMT, TYPE)\
X(add, *img + *buf, PIXFMT, TYPE)\
X(mul, *img * *buf, PIXFMT, TYPE)\
X(min, MIN(*img, *buf), PIXFMT, TYPE)\
X(max, MAX(*img, *buf), PIXFMT, TYPE)
#define X(NAME, ALGO, PIXFMT, TYPE)\
static void\
process_##PIXFMT##_##NAME(struct stream *stream, void *image)\
{\
TYPE *buf, *img = image;\
size_t i, n, j = 0, m = stream->frame_size / sizeof(TYPE);\
do {\
n = stream->ptr / sizeof(TYPE);\
buf = (TYPE *)(stream->buf);\
for (i = 0; i < n; i++, buf++) {\
*img = ALGO;\
if (++j == m) {\
j = 0;\
img = image;\
} else {\
img++;\
}\
}\
n *= sizeof(TYPE);\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
}
LIST_OPERATORS(lf, double)
LIST_OPERATORS(f, float)
#undef X
static process_func
get_process_lf(const char *operation)
{
#define X(NAME, _ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(lf, double)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
static process_func
get_process_f(const char *operation)
{
#define X(NAME, _ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(f, float)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
int
main(int argc, char *argv[])
{
struct stream stream;
process_func process;
char *img;
UNOFLAGS(argc != 1);
eopen_stream(&stream, NULL);
if (stream.encoding == DOUBLE)
process = get_process_lf(argv[0]);
else
process = get_process_f(argv[0]);
echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
img = emalloc(stream.frame_size);
if (!eread_frame(&stream, img))
eprintf("video has no frames\n");
process(&stream, img);
if (stream.ptr)
eprintf("%s: incomplete frame\n", stream.file);
stream.frames = 1;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
ewriteall(STDOUT_FILENO, img, stream.frame_size, "<stdout>");
free(img);
return 0;
}
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