diff options
Diffstat (limited to 'src/engine/stereogram.c')
| -rw-r--r-- | src/engine/stereogram.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/engine/stereogram.c b/src/engine/stereogram.c new file mode 100644 index 0000000..28f0c01 --- /dev/null +++ b/src/engine/stereogram.c @@ -0,0 +1,193 @@ +#ifndef _plan9_ +#include <config.h> +#ifndef NO_MALLOC_H +#include <malloc.h> +#endif +#ifdef HAVE_ALLOCA_H +#include <alloca.h> +#endif +#include <stdlib.h> +#else +#include <u.h> +#include <libc.h> +#include <stdio.h> +#endif +#include <xthread.h> +#include <filter.h> + +#define PIXELWIDTH (f->image->pixelwidth) /*all distances in cm */ +#define PIXELHEIGHT (f->image->pixelheight) + +#define USER_DIST (60.0) +#define INDEX_DIST (0.3) +#define EYE_DIST (8.5) +#define START1 (60.0) +#define FNC(x) x + +#define NCOLORS 256 +#define IMAGETYPE SMALLITER +#define spixel_t pixel8_t +static int *table; +struct stereogramdata { + int minc; + struct palette *palette; + struct palette *savedpalette; +}; + +#include <c256.h> +#define do_stereogram do_stereogram8 +#include "stereod.c" + +#include <hicolor.h> +#define do_stereogram do_stereogram16 +#include "stereod.c" + +#include <true24.h> +#define do_stereogram do_stereogram24 +#include "stereod.c" + +#include <truecolor.h> +#define do_stereogram do_stereogram32 +#include "stereod.c" + +static int requirement(struct filter *f, struct requirements *r) +{ + f->req = *r; + r->nimages = 1; + r->flags &= ~IMAGEDATA; + r->supportedmask = + C256 | TRUECOLOR | TRUECOLOR24 | TRUECOLOR16 | GRAYSCALE; + return (f->next->action->requirement(f->next, r)); +} + +static int initialize(struct filter *f, struct initdata *i) +{ + struct stereogramdata *s = (struct stereogramdata *) f->data; + inhermisc(f, i); + if (s->savedpalette == NULL) + s->savedpalette = clonepalette(i->image->palette); + mkstereogrampalette(i->image->palette); + if (!inherimage + (f, i, TOUCHIMAGE, i->image->width / 2, (i->image->height) / 2, + s->palette, i->image->pixelwidth * 2, i->image->pixelheight * 2)) + return 0; + setfractalpalette(f, s->savedpalette); + return (f->previous->action->initialize(f->previous, i)); +} + +static struct filter *getinstance(CONST struct filteraction *a) +{ + struct filter *f = createfilter(a); + struct stereogramdata *i = + (struct stereogramdata *) calloc(1, sizeof(*i)); + i->minc = 0; + i->savedpalette = NULL; + i->palette = + createpalette(0, 65536, IMAGETYPE, 0, 65536, NULL, NULL, NULL, + NULL, NULL); + f->data = i; + f->name = "Random dot stereogram"; + return (f); +} + +static void destroyinstance(struct filter *f) +{ + struct stereogramdata *i = (struct stereogramdata *) f->data; + if (i->savedpalette != NULL) + destroypalette(i->savedpalette); + destroypalette(i->palette); + destroyinheredimage(f); + free(f); + free(i); +} + +static int doit(struct filter *f, int flags, int time) +{ + int val; + struct stereogramdata *s = (struct stereogramdata *) f->data; + int i, y; + double start, maxdist, dist; + updateinheredimage(f); + if (f->fractalc->maxiter < NCOLORS) + s->palette->size = f->fractalc->maxiter; + else + s->palette->size = NCOLORS; + val = f->previous->action->doit(f->previous, flags, time); +#ifdef HAVE_ALLOCA + table = (int *) alloca(sizeof(int) * NCOLORS); +#else + table = (int *) malloc(sizeof(int) * NCOLORS); +#endif + dist = (f->fractalc->s.rr) / 2; + maxdist = INDEX_DIST * FNC(f->fractalc->maxiter) + START1; + do { + start = dist * maxdist - INDEX_DIST * FNC(s->minc); + maxdist *= 5; + } + while (start + INDEX_DIST * (FNC(s->minc)) < 25.0); + if (f->fractalc->maxiter < NCOLORS) + y = f->fractalc->maxiter; + else + y = NCOLORS; + if (y < 256) + y = 256; + for (i = 0; i < y; i++) { + double dist; + if (i != 0) + dist = i; + else + dist = y - 1; + dist = INDEX_DIST * (FNC(dist)) + start; + table[i] = + (int) (EYE_DIST * dist / (dist + USER_DIST) / PIXELWIDTH); + } + drivercall(*f->image, + xth_function(do_stereogram8, f, f->childimage->height), + xth_function(do_stereogram16, f, f->childimage->height), + xth_function(do_stereogram24, f, f->childimage->height), + xth_function(do_stereogram32, f, f->childimage->height)); + xth_sync(); +#ifndef HAVE_ALLOCA + free(table); +#endif + return val; +} + +static void convertup(struct filter *f, int *x, int *y) +{ + *y *= 2; + *x *= 2; + f->next->action->convertup(f->next, x, y); +} + +static void convertdown(struct filter *f, int *x, int *y) +{ + *y /= 2; + *x /= 2; + if (f->previous != NULL) + f->previous->action->convertdown(f->previous, x, y); +} + +static void myremovefilter(struct filter *f) +{ + struct stereogramdata *s = (struct stereogramdata *) f->data; + if (s->savedpalette != NULL) { + restorepalette(f->image->palette, s->savedpalette); + destroypalette(s->savedpalette); + s->savedpalette = NULL; + } +} + +CONST struct filteraction stereogram_filter = { + "Random dot stereogram", + "stereogram", + 0, + getinstance, + destroyinstance, + doit, + requirement, + initialize, + convertup, + convertdown, + myremovefilter +}; |