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/* An edge detection filter.
* This is very simple filter - it initializes smalliter image and then
* does an simple edge detection algo on it.
*/
#include <config.h>
#ifndef _plan9_
#ifndef NO_MALLOC_H
#include <malloc.h>
#endif
#include <stdio.h> /*for NULL */
#else
#include <u.h>
#include <libc.h>
#include <stdio.h>
#endif
#define SLARGEITER
#include <xthread.h>
#include <filter.h>
#define spixel_t pixel8_t
#include <c256.h>
#define do_edge do_edge8
#include "edge2d.c"
#undef spixel_t
#define spixel_t pixel16_t
#include <truecolor.h>
#define do_edge do_edge32
#include "edge2d.c"
#include <true24.h>
#define do_edge do_edge24
#include "edge2d.c"
#include <hicolor.h>
#define do_edge do_edge16
#include "edge2d.c"
static int requirement(struct filter *f, struct requirements *r)
{
f->req = *r;
r->nimages = 1;
r->flags &= ~IMAGEDATA;
r->supportedmask = MASK1BPP | MASK2BPP | MASK3BPP | MASK4BPP;
return (f->next->action->requirement(f->next, r));
}
static int initialize(struct filter *f, struct initdata *i)
{
inhermisc(f, i);
/*in/out coloring modes looks better in iter modes. This also saves some
memory in truecolor. */
if (f->data != NULL)
destroypalette((struct palette *) f->data);
f->data =
createpalette(0, 65536,
i->image->bytesperpixel <= 1 ? SMALLITER : LARGEITER,
0, 65536, NULL, NULL, NULL, NULL, NULL);
if (!inherimage
(f, i, TOUCHIMAGE | NEWIMAGE, 0, 0, (struct palette *) f->data, 0,
0))
return 0;
return (f->previous->action->initialize(f->previous, i));
}
static struct filter *getinstance(CONST struct filteraction *a)
{
struct filter *f = createfilter(a);
f->name = "Edge detection";
return (f);
}
static void destroyinstance(struct filter *f)
{
if (f->data != NULL)
destroypalette((struct palette *) f->data);
destroyinheredimage(f);
free(f);
}
static int doit(struct filter *f, int flags, int time)
{
int val;
int size = f->childimage->palette->type == SMALLITER ? 253 : 65536;
if (f->image->palette->size < size)
size = f->image->palette->size;
if (((struct palette *) f->data)->size != size)
((struct palette *) f->data)->size =
size, ((struct palette *) f->data)->version++;
updateinheredimage(f);
val = f->previous->action->doit(f->previous, flags, time);
drivercall(*f->image,
xth_function(do_edge8, f, f->image->height),
xth_function(do_edge16, f, f->image->height),
xth_function(do_edge24, f, f->image->height),
xth_function(do_edge32, f, f->image->height));
xth_sync();
return val;
}
CONST struct filteraction edge2_filter = {
"Edge detection2",
"edge2",
0,
getinstance,
destroyinstance,
doit,
requirement,
initialize,
convertupgeneric,
convertdowngeneric,
NULL
};
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