/* -*- mode: C; tab-width: 4 -*-
* xscreensaver, Copyright (c) 1992-2018 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/* distort
* by Jonas Munsin (jmunsin@iki.fi) and Jamie Zawinski <jwz@jwz.org>
* TODO:
* -check the allocations in init_round_lense again, maybe make it possible again
* to use swamp without pre-allocating/calculating (although that
* makes it slower) - -swamp is memory hungry
* -more distortion matrices (fortunately, I'm out of ideas :)
* Stuff that would be cool but probably too much of a resource hog:
* -some kind of interpolation to avoid jaggies
* -large speed values leaves the image distorted
* program idea borrowed from a screensaver on a non-*NIX OS,
*
* 28 Sep 1999 Jonas Munsin (jmunsin@iki.fi)
* Added about 10x faster algortim for 8, 16 and 32 bpp (modifies pixels
* directly avoiding costly XPutPixle(XGetPixel()) calls, inspired by
* xwhirl made by horvai@clipper.ens.fr (Peter Horvai) and the XFree86
* Xlib sources.
* This piece of code is really horrible, but it works, and at the moment
* I don't have time or inspiration to fix something that works (knock
* on wood).
* 08 Oct 1999 Jonas Munsin (jmunsin@iki.fi)
* Corrected several bugs causing references beyond allocated memory.
* 09 Oct 2016 Dave Odell (dmo2118@gmail.com)
* Updated for new xshm.c.
*/
#include <math.h>
#include <time.h>
#include "screenhack.h"
/*#include <X11/Xmd.h>*/
# include "xshm.h"
#define CARD32 unsigned int
#define CARD16 unsigned short
#define CARD8 unsigned char
struct coo {
int x;
int y;
int r, r_change;
int xmove, ymove;
};
struct state {
Display *dpy;
Window window;
struct coo xy_coo[10];
int delay, radius, speed, number, blackhole, vortex, magnify, reflect, slow;
int duration;
time_t start_time;
XWindowAttributes xgwa;
GC gc;
unsigned long black_pixel;
XImage *orig_map, *buffer_map;
unsigned long *buffer_map_cache;
int ***from;
int ****from_array;
int *fast_from;
int from_size;
int bpp_size;
XShmSegmentInfo shm_info;
void (*effect) (struct state *, int);
void (*draw) (struct state *, int);
void (*draw_routine) (struct state *st, XImage *, XImage *, int, int, int *);
async_load_state *img_loader;
Pixmap pm;
};
static void move_lense(struct state *, int);
static void swamp_thing(struct state *, int);
static void new_rnd_coo(struct state *, int);
static void init_round_lense(struct state *st);
static void reflect_draw(struct state *, int);
static void plain_draw(struct state *, int);
static void fast_draw_8 (struct state *st, XImage *, XImage *, int, int, int *);
static void fast_draw_16(struct state *st, XImage *, XImage *, int, int, int *);
static void fast_draw_32(struct state *st, XImage *, XImage *, int, int, int *);
static void generic_draw(struct state *st, XImage *, XImage *, int, int, int *);
static void distort_finish_loading (struct state *);
static void
distort_reset (struct state *st)
{
char *s;
int i;
st->start_time = 0;
XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
st->delay = get_integer_resource(st->dpy, "delay", "Integer");
st->duration = get_integer_resource (st->dpy, "duration", "Seconds");
st->radius = get_integer_resource(st->dpy, "radius", "Integer");
st->speed = get_integer_resource(st->dpy, "speed", "Integer");
st->number = get_integer_resource(st->dpy, "number", "Integer");
st->blackhole = get_boolean_resource(st->dpy, "blackhole", "Boolean");
st->vortex = get_boolean_resource(st->dpy, "vortex", "Boolean");
st->magnify = get_boolean_resource(st->dpy, "magnify", "Boolean");
st->reflect = get_boolean_resource(st->dpy, "reflect", "Boolean");
st->slow = get_boolean_resource(st->dpy, "slow", "Boolean");
if (st->xgwa.width > 2560) st->radius *= 3; /* Retina displays */
if (st->delay < 0) st->delay = 0;
if (st->duration < 1) st->duration = 1;
st->effect = NULL;
s = get_string_resource(st->dpy, "effect", "String");
if (s && !strcasecmp(s,"swamp"))
st->effect = &swamp_thing;
else if (s && !strcasecmp(s,"bounce"))
st->effect = &move_lense;
else if (s && !strcasecmp(s,"none"))
;
else if (s && *s)
fprintf(stderr,"%s: bogus effect: %s\n", progname, s);
if (s) free (s);
if (st->effect == NULL && st->radius == 0 && st->speed == 0 && st->number == 0
&& !st->blackhole && !st->vortex && !st->magnify && !st->reflect) {
/* if no cmdline options are given, randomly choose one of:
* -radius 125 -number 4 -speed 1 -bounce
* -radius 125 -number 4 -speed 1 -blackhole
* -radius 125 -number 4 -speed 1 -vortex
* -radius 125 -number 4 -speed 1 -vortex -magnify
* -radius 125 -number 4 -speed 1 -vortex -magnify -blackhole
* -radius 250 -number 1 -speed 2 -bounce
* -radius 250 -number 1 -speed 2 -blackhole
* -radius 250 -number 1 -speed 2 -vortex
* -radius 250 -number 1 -speed 2 -vortex -magnify
* -radius 250 -number 1 -speed 2 -vortex -magnify -blackhole
* -radius 80 -number 1 -speed 2 -reflect
* -radius 125 -number 3 -speed 2 -reflect
* jwz: not these
* -radius 125 -number 4 -speed 2 -swamp
* -radius 125 -number 4 -speed 2 -swamp -blackhole
* -radius 125 -number 4 -speed 2 -swamp -vortex
* -radius 125 -number 4 -speed 2 -swamp -vortex -magnify
* -radius 125 -number 4 -speed 2 -swamp -vortex -magnify -blackhole
*/
i = (random() % 12 /* 17 */);
st->draw = &plain_draw;
switch (i) {
case 0:
st->radius=125;st->number=4;st->speed=1;
st->effect=&move_lense;break;
case 1:
st->radius=125;st->number=4;st->speed=1;st->blackhole=1;
st->effect=&move_lense;break;
case 2:
st->radius=125;st->number=4;st->speed=1;st->vortex=1;
st->effect=&move_lense;break;
case 3:
st->radius=125;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;
st->effect=&move_lense;break;
case 4:
st->radius=125;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;st->blackhole=1;
st->effect=&move_lense;break;
case 5:
st->radius=250;st->number=1;st->speed=2;
st->effect=&move_lense;break;
case 6:
st->radius=250;st->number=1;st->speed=2;st->blackhole=1;
st->effect=&move_lense;break;
case 7:
st->radius=250;st->number=1;st->speed=2;st->vortex=1;
st->effect=&move_lense;break;
case 8:
st->radius=250;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;
st->effect=&move_lense;break;
case 9:
st->radius=250;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
st->effect=&move_lense;break;
case 10:
st->radius=80;st->number=1;st->speed=2;st->reflect=1;
st->draw = &reflect_draw;st->effect = &move_lense;break;
case 11:
st->radius=125;st->number=4;st->speed=2;st->reflect=1;
st->draw = &reflect_draw;st->effect = &move_lense;break;
#if 0 /* jwz: not these */
case 12:
st->radius=125;st->number=4;st->speed=2;
effect=&swamp_thing;break;
case 13:
st->radius=125;st->number=4;st->speed=2;st->blackhole=1;
effect=&swamp_thing;break;
case 14:
st->radius=125;st->number=4;st->speed=2;st->vortex=1;
effect=&swamp_thing;break;
case 15:
st->radius=125;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;
effect=&swamp_thing;break;
case 16:
st->radius=125;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
effect=&swamp_thing;break;
#endif
default:
abort(); break;
}
}
/* never allow the radius to be too close to the min window dimension
*/
if (st->radius > st->xgwa.width * 0.3) st->radius = st->xgwa.width * 0.3;
if (st->radius > st->xgwa.height * 0.3) st->radius = st->xgwa.height * 0.3;
/* -swamp mode consumes vast amounts of memory, proportional to radius --
so throttle radius to a small-ish value (60 => ~30MB.)
*/
if (st->effect == &swamp_thing && st->radius > 60)
st->radius = 60;
if (st->delay < 0)
st->delay = 0;
if (st->radius <= 0)
st->radius = 60;
if (st->speed <= 0)
st->speed = 2;
if (st->number <= 0)
st->number=1;
if (st->number >= 10)
st->number=1;
if (st->effect == NULL)
st->effect = &move_lense;
if (st->reflect) {
st->draw = &reflect_draw;
st->effect = &move_lense;
}
if (st->draw == NULL)
st->draw = &plain_draw;
}
static void *
distort_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
XGCValues gcv;
long gcflags;
st->dpy = dpy;
st->window = window;
distort_reset (st);
st->black_pixel = BlackPixelOfScreen( st->xgwa.screen );
gcv.function = GXcopy;
gcv.subwindow_mode = IncludeInferiors;
gcflags = GCFunction;
if (use_subwindow_mode_p(st->xgwa.screen, st->window)) /* see grabscreen.c */
gcflags |= GCSubwindowMode;
st->gc = XCreateGC (st->dpy, st->window, gcflags, &gcv);
/* On MacOS X11, XGetImage on a Window often gets an inexplicable BadMatch,
possibly due to the window manager having occluded something? It seems
nondeterministic. Loading the image into a pixmap instead fixes it. */
if (st->pm) XFreePixmap (st->dpy, st->pm);
st->pm = XCreatePixmap (st->dpy, st->window,
st->xgwa.width, st->xgwa.height, st->xgwa.depth);
st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
st->pm, 0, 0);
st->start_time = time ((time_t *) 0);
return st;
}
static void
distort_finish_loading (struct state *st)
{
int i;
st->start_time = time ((time_t *) 0);
if (! st->pm) abort();
XClearWindow (st->dpy, st->window);
XCopyArea (st->dpy, st->pm, st->window, st->gc,
0, 0, st->xgwa.width, st->xgwa.height, 0, 0);
if (st->orig_map) XDestroyImage (st->orig_map);
st->orig_map = XGetImage(st->dpy, st->pm, 0, 0,
st->xgwa.width, st->xgwa.height,
~0L, ZPixmap);
if (st->buffer_map_cache) free (st->buffer_map_cache);
st->buffer_map_cache = malloc(sizeof(unsigned long)*(2*st->radius+st->speed+2)*(2*st->radius+st->speed+2));
if (st->buffer_map_cache == NULL) {
perror("distort");
exit(EXIT_FAILURE);
}
if (st->buffer_map)
destroy_xshm_image (st->dpy, st->buffer_map, &st->shm_info);
st->buffer_map = create_xshm_image(st->dpy, st->xgwa.visual, st->orig_map->depth,
ZPixmap, &st->shm_info,
2*st->radius + st->speed + 2,
2*st->radius + st->speed + 2);
if ((st->buffer_map->byte_order == st->orig_map->byte_order)
&& (st->buffer_map->depth == st->orig_map->depth)
&& (st->buffer_map->format == ZPixmap)
&& (st->orig_map->format == ZPixmap)
&& !st->slow) {
switch (st->orig_map->bits_per_pixel) {
case 32:
st->draw_routine = &fast_draw_32;
st->bpp_size = sizeof(CARD32);
break;
case 16:
st->draw_routine = &fast_draw_16;
st->bpp_size = sizeof(CARD16);
break;
case 8:
st->draw_routine = &fast_draw_8;
st->bpp_size = sizeof(CARD8);
break;
default:
st->draw_routine = &generic_draw;
break;
}
} else {
st->draw_routine = &generic_draw;
}
init_round_lense(st);
for (i = 0; i < st->number; i++) {
new_rnd_coo(st,i);
if (st->number != 1)
st->xy_coo[i].r = (i*st->radius)/(st->number-1); /* "randomize" initial */
else
st->xy_coo[i].r = 0;
st->xy_coo[i].r_change = st->speed + (i%2)*2*(-st->speed); /* values a bit */
st->xy_coo[i].xmove = st->speed + (i%2)*2*(-st->speed);
st->xy_coo[i].ymove = st->speed + (i%2)*2*(-st->speed);
}
}
/* example: initializes a "see-trough" matrix */
/* static void make_null_lense(struct state *st)
{
int i, j;
for (i = 0; i < 2*radius+speed+2; i++) {
for (j = 0 ; j < 2*radius+speed+2 ; j++) {
from[i][j][0]=i;
from[i][j][1]=j;
}
}
}
*/
static void convert(struct state *st)
{
int *p;
int i, j;
if (st->fast_from) free (st->fast_from);
st->fast_from = calloc(1, sizeof(int)*((st->buffer_map->bytes_per_line/st->bpp_size)*(2*st->radius+st->speed+2) + 2*st->radius+st->speed+2));
if (st->fast_from == NULL) {
perror("distort");
exit(EXIT_FAILURE);
}
p = st->fast_from;
for (i = 0; i < 2*st->radius+st->speed+2; i++) {
for (j = 0; j < 2*st->radius+st->speed+2; j++) {
*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size)
= st->from[i][j][0] + st->xgwa.width*st->from[i][j][1];
if (*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) < 0
|| *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) >= st->orig_map->height*st->orig_map->width) {
*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) = 0;
}
}
}
}
/* makes a lense with the Radius=loop and centred in
* the point (radius, radius)
*/
static void make_round_lense(struct state *st, int radius, int loop)
{
int i, j;
for (i = 0; i < 2*radius+st->speed+2; i++) {
for(j = 0; j < ((0 == st->bpp_size) ? (2*radius+st->speed+2) : (st->buffer_map->bytes_per_line/st->bpp_size)); j++) {
double r, d;
r = sqrt ((i-radius)*(i-radius)+(j-radius)*(j-radius));
if (loop == 0)
d=0.0;
else
d=r/loop;
if (r < loop-1) {
if (st->vortex) { /* vortex-twist effect */
double angle;
/* this one-line formula for getting a nice rotation angle is borrowed
* (with permission) from the whirl plugin for gimp,
* Copyright (C) 1996 Federico Mena Quintero
*/
/* 5 is just a constant used because it looks good :) */
angle = 5*(1-d)*(1-d);
/* Avoid atan2: DOMAIN error message */
if ((radius-j) == 0.0 && (radius-i) == 0.0) {
st->from[i][j][0] = radius + cos(angle)*r;
st->from[i][j][1] = radius + sin(angle)*r;
} else {
st->from[i][j][0] = radius +
cos(angle - atan2(radius-j, -(radius-i)))*r;
st->from[i][j][1] = radius +
sin(angle - atan2(radius-j, -(radius-i)))*r;
}
if (st->magnify) {
r = sin(d*M_PI_2);
if (st->blackhole && r != 0) /* blackhole effect */
r = 1/r;
st->from[i][j][0] = radius + (st->from[i][j][0]-radius)*r;
st->from[i][j][1] = radius + (st->from[i][j][1]-radius)*r;
}
} else { /* default is to magnify */
r = sin(d*M_PI_2);
/* raising r to different power here gives different amounts of
* distortion, a negative value sucks everything into a black hole
*/
/* r = r*r; */
if (st->blackhole && r != 0) /* blackhole effect */
r = 1/r;
/* bubble effect (and blackhole) */
st->from[i][j][0] = radius + (i-radius)*r;
st->from[i][j][1] = radius + (j-radius)*r;
}
} else { /* not inside loop */
st->from[i][j][0] = i;
st->from[i][j][1] = j;
}
}
}
/* this is really just a quick hack to keep both the compability mode with all depths and still
* allow the custom optimized draw routines with the minimum amount of work */
if (0 != st->bpp_size) {
convert(st);
}
}
#ifndef EXIT_FAILURE
# define EXIT_FAILURE -1
#endif
static void allocate_lense(struct state *st)
{
int i, j;
int s = ((0 != st->bpp_size) ? (st->buffer_map->bytes_per_line/st->bpp_size) : (2*st->radius+st->speed+2));
/* maybe this should be redone so that from[][][] is in one block;
* then pointers could be used instead of arrays in some places (and
* maybe give a speedup - maybe also consume less memory)
*/
if (st->from) {
for (i = 0; i < st->from_size; i++)
if (st->from[i]) {
for (j = 0; j < st->from_size; j++) {
if (st->from[i][j]) free (st->from[i][j]);
}
free (st->from[i]);
}
free (st->from);
}
st->from_size = s;
st->from = (int ***)malloc(s*sizeof(int **));
if (st->from == NULL) {
perror("distort");
exit(EXIT_FAILURE);
}
for (i = 0; i < s; i++) {
st->from[i] = (int **)malloc((2*st->radius+st->speed+2) * sizeof(int *));
if (st->from[i] == NULL) {
perror("distort");
exit(EXIT_FAILURE);
}
for (j = 0; j < s; j++) {
st->from[i][j] = (int *)malloc(2 * sizeof(int));
if (st->from[i][j] == NULL) {
perror("distort");
exit(EXIT_FAILURE);
}
}
}
}
/* from_array in an array containing precalculated from matrices,
* this is a double faced mem vs speed trade, it's faster, but eats
* _a lot_ of mem for large radius (is there a bug here? I can't see it)
*/
static void init_round_lense(struct state *st)
{
int k;
if (st->effect == &swamp_thing) {
if (st->from_array) free (st->from_array);
st->from_array = (int ****)malloc((st->radius+1)*sizeof(int ***));
for (k=0; k <= st->radius; k++) {
allocate_lense(st);
make_round_lense(st, st->radius, k);
st->from_array[k] = st->from;
}
} else { /* just allocate one from[][][] */
allocate_lense(st);
make_round_lense(st, st->radius,st->radius);
}
}
/* If fast_draw_8, fast_draw_16 or fast_draw_32 are to be used, the following properties
* of the src and dest XImages must hold (otherwise the generic, slooow, method provided
* by X is to be used):
* src->byte_order == dest->byte_order
* src->format == ZPixmap && dest->format == ZPixmap
* src->depth == dest->depth == the depth the function in question asumes
* x and y is the coordinates in src from where to cut out the image from,
* distort_matrix is a precalculated array of how to distort the matrix
*/
static void fast_draw_8(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
{
CARD8 *u = (CARD8 *)dest->data;
CARD8 *t = (CARD8 *)src->data + x + y*src->bytes_per_line/sizeof(CARD8);
while (u < (CARD8 *)(dest->data + sizeof(CARD8)*dest->height
*dest->bytes_per_line/sizeof(CARD8))) {
*u++ = t[*distort_matrix++];
}
}
static void fast_draw_16(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
{
CARD16 *u = (CARD16 *)dest->data;
CARD16 *t = (CARD16 *)src->data + x + y*src->bytes_per_line/sizeof(CARD16);
while (u < (CARD16 *)(dest->data + sizeof(CARD16)*dest->height
*dest->bytes_per_line/sizeof(CARD16))) {
*u++ = t[*distort_matrix++];
}
}
static void fast_draw_32(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
{
CARD32 *u = (CARD32 *)dest->data;
CARD32 *t = (CARD32 *)src->data + x + y*src->bytes_per_line/sizeof(CARD32);
while (u < (CARD32 *)(dest->data + sizeof(CARD32)*dest->height
*dest->bytes_per_line/sizeof(CARD32))) {
*u++ = t[*distort_matrix++];
}
}
static void generic_draw(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
{
int i, j;
for (i = 0; i < dest->width; i++)
for (j = 0; j < dest->height; j++)
if (st->from[i][j][0] + x >= 0 &&
st->from[i][j][0] + x < src->width &&
st->from[i][j][1] + y >= 0 &&
st->from[i][j][1] + y < src->height)
XPutPixel(dest, i, j,
XGetPixel(src,
st->from[i][j][0] + x,
st->from[i][j][1] + y));
}
/* generate an XImage of from[][][] and draw it on the screen */
static void plain_draw(struct state *st, int k)
{
if (st->xy_coo[k].x+2*st->radius+st->speed+2 > st->orig_map->width ||
st->xy_coo[k].y+2*st->radius+st->speed+2 > st->orig_map->height)
return;
st->draw_routine(st, st->orig_map, st->buffer_map, st->xy_coo[k].x, st->xy_coo[k].y, st->fast_from);
put_xshm_image(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
2*st->radius+st->speed+2, 2*st->radius+st->speed+2, &st->shm_info);
}
/* generate an XImage from the reflect algoritm submitted by
* Randy Zack <randy@acucorp.com>
* draw really got too big and ugly so I split it up
* it should be possible to use the from[][] to speed it up
* (once I figure out the algorithm used :)
*/
static void reflect_draw(struct state *st, int k)
{
int i, j;
int cx, cy;
int ly, lysq, lx, ny, dist, rsq = st->radius * st->radius;
cx = cy = st->radius;
if (st->xy_coo[k].ymove > 0)
cy += st->speed;
if (st->xy_coo[k].xmove > 0)
cx += st->speed;
for(i = 0 ; i < 2*st->radius+st->speed+2; i++) {
ly = i - cy;
lysq = ly * ly;
ny = st->xy_coo[k].y + i;
if (ny >= st->orig_map->height) ny = st->orig_map->height-1;
for(j = 0 ; j < 2*st->radius+st->speed+2 ; j++) {
lx = j - cx;
dist = lx * lx + lysq;
if (dist > rsq ||
ly < -st->radius || ly > st->radius ||
lx < -st->radius || lx > st->radius)
XPutPixel( st->buffer_map, j, i,
XGetPixel( st->orig_map, st->xy_coo[k].x + j, ny ));
else if (dist == 0)
XPutPixel( st->buffer_map, j, i, st->black_pixel );
else {
int x = st->xy_coo[k].x + cx + (lx * rsq / dist);
int y = st->xy_coo[k].y + cy + (ly * rsq / dist);
if (x < 0 || x >= st->xgwa.width ||
y < 0 || y >= st->xgwa.height)
XPutPixel( st->buffer_map, j, i, st->black_pixel );
else
XPutPixel( st->buffer_map, j, i,
XGetPixel( st->orig_map, x, y ));
}
}
}
XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
}
/* create a new, random coordinate, that won't interfer with any other
* coordinates, as the drawing routines would be significantly slowed
* down if they were to handle serveral layers of distortions
*/
static void new_rnd_coo(struct state *st, int k)
{
int i;
int loop = 0;
st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
for (i = 0; i < st->number; i++) {
if (i != k) {
if ((abs(st->xy_coo[k].x - st->xy_coo[i].x) <= 2*st->radius+st->speed+2)
&& (abs(st->xy_coo[k].y - st->xy_coo[i].y) <= 2*st->radius+st->speed+2)) {
st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
i=-1; /* ugly */
}
}
if (loop++ > 1000) return; /* let's not get stuck */
}
}
/* move lens and handle bounces with walls and other lenses */
static void move_lense(struct state *st, int k)
{
int i;
if (st->xy_coo[k].x + 2*st->radius + st->speed + 2 >= st->xgwa.width)
st->xy_coo[k].xmove = -abs(st->xy_coo[k].xmove);
if (st->xy_coo[k].x <= st->speed)
st->xy_coo[k].xmove = abs(st->xy_coo[k].xmove);
if (st->xy_coo[k].y + 2*st->radius + st->speed + 2 >= st->xgwa.height)
st->xy_coo[k].ymove = -abs(st->xy_coo[k].ymove);
if (st->xy_coo[k].y <= st->speed)
st->xy_coo[k].ymove = abs(st->xy_coo[k].ymove);
st->xy_coo[k].x = st->xy_coo[k].x + st->xy_coo[k].xmove;
st->xy_coo[k].y = st->xy_coo[k].y + st->xy_coo[k].ymove;
/* bounce against othe lenses */
for (i = 0; i < st->number; i++) {
if ((i != k)
/* This commented test is for rectangular lenses (not currently used) and
* the one used is for circular ones
&& (abs(xy_coo[k].x - xy_coo[i].x) <= 2*radius)
&& (abs(xy_coo[k].y - xy_coo[i].y) <= 2*radius)) { */
&& ((st->xy_coo[k].x - st->xy_coo[i].x)*(st->xy_coo[k].x - st->xy_coo[i].x)
+ (st->xy_coo[k].y - st->xy_coo[i].y)*(st->xy_coo[k].y - st->xy_coo[i].y)
<= 2*st->radius*2*st->radius)) {
int x, y;
x = st->xy_coo[k].xmove;
y = st->xy_coo[k].ymove;
st->xy_coo[k].xmove = st->xy_coo[i].xmove;
st->xy_coo[k].ymove = st->xy_coo[i].ymove;
st->xy_coo[i].xmove = x;
st->xy_coo[i].ymove = y;
}
}
}
/* make xy_coo[k] grow/shrink */
static void swamp_thing(struct state *st, int k)
{
if (st->xy_coo[k].r >= st->radius)
st->xy_coo[k].r_change = -abs(st->xy_coo[k].r_change);
if (st->xy_coo[k].r <= 0) {
st->from = st->from_array[0];
st->draw(st,k);
st->xy_coo[k].r_change = abs(st->xy_coo[k].r_change);
new_rnd_coo(st,k);
st->xy_coo[k].r=st->xy_coo[k].r_change;
return;
}
st->xy_coo[k].r = st->xy_coo[k].r + st->xy_coo[k].r_change;
if (st->xy_coo[k].r >= st->radius)
st->xy_coo[k].r = st->radius;
if (st->xy_coo[k].r <= 0)
st->xy_coo[k].r=0;
st->from = st->from_array[st->xy_coo[k].r];
}
static unsigned long
distort_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int k;
if (st->img_loader) /* still loading */
{
st->img_loader = load_image_async_simple (st->img_loader, 0, 0, 0, 0, 0);
if (! st->img_loader) { /* just finished */
distort_finish_loading (st);
}
return st->delay;
}
if (!st->img_loader &&
st->start_time + st->duration < time ((time_t *) 0)) {
if (st->pm) XFreePixmap (st->dpy, st->pm);
st->pm = XCreatePixmap (st->dpy, st->window,
st->xgwa.width, st->xgwa.height, st->xgwa.depth);
st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
st->pm, 0, 0);
return st->delay;
}
for (k = 0; k < st->number; k++) {
st->effect(st,k);
st->draw(st,k);
}
return st->delay;
}
static void
distort_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
struct state *st = (struct state *) closure;
XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
/* XClearWindow (dpy, window); */
/* Why doesn't this work? */
if (st->orig_map) /* created in distort_finish_loading, might be early */
XPutImage (st->dpy, st->window, st->gc, st->orig_map,
0, 0, st->orig_map->width, st->orig_map->height, 0, 0);
}
static Bool
distort_event (Display *dpy, Window window, void *closure, XEvent *event)
{
struct state *st = (struct state *) closure;
if (screenhack_event_helper (dpy, window, event))
{
distort_reset(st);
return True;
}
return False;
}
static void
distort_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
int i, j;
XFreeGC (st->dpy, st->gc);
if (st->pm) XFreePixmap (dpy, st->pm);
if (st->orig_map) XDestroyImage (st->orig_map);
if (st->buffer_map)
destroy_xshm_image (st->dpy, st->buffer_map, &st->shm_info);
if (st->fast_from) free (st->fast_from);
if (st->from_array) free (st->from_array);
if (st->buffer_map_cache) free (st->buffer_map_cache);
if (st->from) {
for (i = 0; i < st->from_size; i++)
if (st->from[i]) {
for (j = 0; j < st->from_size; j++) {
if (st->from[i][j]) free (st->from[i][j]);
}
free (st->from[i]);
}
free (st->from);
}
free (st);
}
static const char *distort_defaults [] = {
"*dontClearRoot: True",
"*background: Black",
"*fpsSolid: true",
#ifdef __sgi /* really, HAVE_READ_DISPLAY_EXTENSION */
"*visualID: Best",
#endif
"*delay: 20000",
"*duration: 120",
"*radius: 0",
"*speed: 0",
"*number: 0",
"*slow: False",
"*vortex: False",
"*magnify: False",
"*reflect: False",
"*blackhole: False",
"*effect: none",
#ifdef HAVE_XSHM_EXTENSION
"*useSHM: False", /* xshm turns out not to help. */
#endif /* HAVE_XSHM_EXTENSION */
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
"*rotateImages: True",
#endif
0
};
static XrmOptionDescRec distort_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-duration", ".duration", XrmoptionSepArg, 0 },
{ "-radius", ".radius", XrmoptionSepArg, 0 },
{ "-speed", ".speed", XrmoptionSepArg, 0 },
{ "-number", ".number", XrmoptionSepArg, 0 },
{ "-effect", ".effect", XrmoptionSepArg, 0 },
{ "-swamp", ".effect", XrmoptionNoArg, "swamp" },
{ "-bounce", ".effect", XrmoptionNoArg, "bounce" },
{ "-reflect", ".reflect", XrmoptionNoArg, "True" },
{ "-vortex", ".vortex", XrmoptionNoArg, "True" },
{ "-magnify", ".magnify", XrmoptionNoArg, "True" },
{ "-blackhole", ".blackhole", XrmoptionNoArg, "True" },
{ "-slow", ".slow", XrmoptionNoArg, "True" },
#ifdef HAVE_XSHM_EXTENSION
{ "-shm", ".useSHM", XrmoptionNoArg, "True" },
{ "-no-shm", ".useSHM", XrmoptionNoArg, "False" },
#endif /* HAVE_XSHM_EXTENSION */
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("Distort", distort)
