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+/* Copyright © Chris Le Sueur and Robby Griffin, 2005-2006
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Ultimate thanks go to Massimino Pascal, who created the original
+xscreensaver hack, and inspired me with it's swirly goodness. This
+version adds things like variable quality, number of functions and also
+a groovier colouring mode.
+
+This version by Chris Le Sueur <thefishface@gmail.com>, Feb 2005
+Many improvements by Robby Griffin <rmg@terc.edu>, Mar 2006
+Multi-coloured mode added by Jack Grahl <j.grahl@ucl.ac.uk>, Jan 2007
+*/
+
+#include <assert.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include "screenhack.h"
+
+#undef countof
+#define countof(x) (sizeof((x)) / sizeof(*(x)))
+
+typedef struct {
+ float r, s, tx, ty; /* Rotation, Scale, Translation X & Y */
+ float ro, rt, rc; /* Old Rotation, Rotation Target, Rotation Counter */
+ float so, st, sc; /* Old Scale, Scale Target, Scale Counter */
+ float sa, txa, tya; /* Scale change, Translation change */
+
+ int ua, ub, utx; /* Precomputed combined r,s,t values */
+ int uc, ud, uty; /* Precomputed combined r,s,t values */
+
+} Lens;
+
+struct state {
+ Display *dpy;
+ Window window;
+ GC gc;
+ Drawable backbuffer;
+ XColor *colours;
+ int ncolours;
+ int ccolour;
+ int blackColor, whiteColor;
+
+ int width, widthb, height;
+ int width8, height8;
+ unsigned int *board;
+ XPoint pointbuf[1000];
+ int npoints;
+ int xmin, xmax, ymin, ymax;
+ int x, y;
+
+ int delay;
+
+ int lensnum;
+ Lens *lenses;
+ int length;
+ int mode;
+ Bool recurse;
+ Bool multi;
+ Bool translate, scale, rotate;
+};
+
+#define getdot(x,y) (st->board[((y)*st->widthb)+((x)>>5)] & (1<<((x) & 31)))
+#define setdot(x,y) (st->board[((y)*st->widthb)+((x)>>5)] |= (1<<((x) & 31)))
+
+static float
+myrandom(float up)
+{
+ return (((float)random() / RAND_MAX) * up);
+}
+
+static const char *ifs_defaults [] = {
+ ".lowrez: true",
+ ".background: Black",
+ "*lensnum: 3",
+ "*fpsSolid: true",
+ "*length: 9",
+ "*mode: 0",
+ "*colors: 200",
+ "*delay: 20000",
+ "*translate: True",
+ "*scale: True",
+ "*rotate: True",
+ "*recurse: False",
+ "*multi: True",
+# ifdef HAVE_JWXYZ /* Don't second-guess Quartz's double-buffering */
+ "*doubleBuffer: False",
+#else
+ "*doubleBuffer: True",
+#endif
+#ifdef HAVE_MOBILE
+ "*ignoreRotation: True",
+#endif
+ 0
+};
+
+static XrmOptionDescRec ifs_options [] = {
+ { "-detail", ".length", XrmoptionSepArg, 0 },
+ { "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-mode", ".mode", XrmoptionSepArg, 0 },
+ { "-colors", ".colors", XrmoptionSepArg, 0 },
+ { "-functions", ".lensnum", XrmoptionSepArg, 0 },
+ { "-no-translate", ".translate", XrmoptionNoArg, "False" },
+ { "-no-scale", ".scale", XrmoptionNoArg, "False" },
+ { "-no-rotate", ".rotate", XrmoptionNoArg, "False" },
+ { "-recurse", ".recurse", XrmoptionNoArg, "True" },
+ { "-iterate", ".recurse", XrmoptionNoArg, "False" },
+ { "-multi", ".multi", XrmoptionNoArg, "True" },
+ { "-no-multi", ".multi", XrmoptionNoArg, "False" },
+ { "-db", ".doubleBuffer",XrmoptionNoArg, "True" },
+ { "-no-db", ".doubleBuffer",XrmoptionNoArg, "False" },
+ { 0, 0, 0, 0 }
+};
+
+
+/* Draw all the queued points on the backbuffer */
+static void
+drawpoints(struct state *st)
+{
+ XDrawPoints(st->dpy, st->backbuffer, st->gc, st->pointbuf, st->npoints,
+ CoordModeOrigin);
+ st->npoints = 0;
+}
+
+/* Set a point to be drawn, if it hasn't been already.
+ * Expects coordinates in 256ths of a pixel. */
+static void
+sp(struct state *st, int x, int y)
+{
+ if (x < 0 || x >= st->width8 || y < 0 || y >= st->height8)
+ return;
+
+ x >>= 8;
+ y >>= 8;
+
+ if (getdot(x, y)) return;
+ setdot(x, y);
+
+ if (x < st->xmin) st->xmin = x;
+ if (x > st->xmax) st->xmax = x;
+ if (y < st->ymin) st->ymin = y;
+ if (y > st->ymax) st->ymax = y;
+
+ st->pointbuf[st->npoints].x = x;
+ st->pointbuf[st->npoints].y = y;
+ st->npoints++;
+
+ if (st->npoints >= countof(st->pointbuf)) {
+ drawpoints(st);
+ }
+}
+
+
+/* Precompute integer values for matrix multiplication and vector
+ * addition. The matrix multiplication will go like this (see iterate()):
+ * |x2| |ua ub| |x| |utx|
+ * | | = | | * | | + | |
+ * |y2| |uc ud| |y| |uty|
+ *
+ * There is an extra factor of 2^10 in these values, and an extra factor of
+ * 2^8 in the coordinates, in order to implement fixed-point arithmetic.
+ */
+static void
+lensmatrix(struct state *st, Lens *l)
+{
+ l->ua = 1024.0 * l->s * cos(l->r);
+ l->ub = -1024.0 * l->s * sin(l->r);
+ l->uc = -l->ub;
+ l->ud = l->ua;
+ l->utx = 131072.0 * st->width * (l->s * (sin(l->r) - cos(l->r))
+ + l->tx / 16 + 1);
+ l->uty = -131072.0 * st->height * (l->s * (sin(l->r) + cos(l->r))
+ + l->ty / 16 - 1);
+}
+
+static void
+CreateLens(struct state *st,
+ float nr,
+ float ns,
+ float nx,
+ float ny,
+ Lens *newlens)
+{
+ newlens->sa = newlens->txa = newlens->tya = 0;
+ if (st->rotate) {
+ newlens->r = newlens->ro = newlens->rt = nr;
+ newlens->rc = 1;
+ }
+ else newlens->r = 0;
+
+ if (st->scale) {
+ newlens->s = newlens->so = newlens->st = ns;
+ newlens->sc = 1;
+ }
+ else newlens->s = 0.5;
+
+ newlens->tx = nx;
+ newlens->ty = ny;
+
+ lensmatrix(st, newlens);
+}
+
+static void
+mutate(struct state *st, Lens *l)
+{
+ if (st->rotate) {
+ float factor;
+ if(l->rc >= 1) {
+ l->rc = 0;
+ l->ro = l->rt;
+ l->rt = myrandom(4) - 2;
+ }
+ factor = (sin((-M_PI / 2.0) + M_PI * l->rc) + 1.0) / 2.0;
+ l->r = l->ro + (l->rt - l->ro) * factor;
+ l->rc += 0.01;
+ }
+ if (st->scale) {
+ float factor;
+ if (l->sc >= 1) {
+ /* Reset counter, obtain new target value */
+ l->sc = 0;
+ l->so = l->st;
+ l->st = myrandom(2) - 1;
+ }
+ factor = (sin((-M_PI / 2.0) + M_PI * l->sc) + 1.0) / 2.0;
+ /* Take average of old target and new target, using factor to *
+ * weight. It's computed sinusoidally, resulting in smooth, *
+ * rhythmic transitions. */
+ l->s = l->so + (l->st - l->so) * factor;
+ l->sc += 0.01;
+ }
+ if (st->translate) {
+ l->txa += myrandom(0.004) - 0.002;
+ l->tya += myrandom(0.004) - 0.002;
+ l->tx += l->txa;
+ l->ty += l->tya;
+ if (l->tx > 6) l->txa -= 0.004;
+ if (l->ty > 6) l->tya -= 0.004;
+ if (l->tx < -6) l->txa += 0.004;
+ if (l->ty < -6) l->tya += 0.004;
+ if (l->txa > 0.05 || l->txa < -0.05) l->txa /= 1.7;
+ if (l->tya > 0.05 || l->tya < -0.05) l->tya /= 1.7;
+ }
+ if (st->rotate || st->scale || st->translate) {
+ lensmatrix(st, l);
+ }
+}
+
+
+#define STEPX(l,x,y) (((l)->ua * (x) + (l)->ub * (y) + (l)->utx) >> 10)
+#define STEPY(l,x,y) (((l)->uc * (x) + (l)->ud * (y) + (l)->uty) >> 10)
+/*#define STEPY(l,x,y) (((l)->ua * (y) - (l)->ub * (x) + (l)->uty) >> 10)*/
+
+/* Calls itself <lensnum> times - with results from each lens/function. *
+ * After <length> calls to itself, it stops iterating and draws a point. */
+static void
+recurse(struct state *st, int x, int y, int length, int p)
+{
+ int i;
+ Lens *l;
+
+ if (length == 0) {
+ if (p == 0)
+ sp(st, x, y);
+ else {
+ l = &st->lenses[p];
+ sp(st, STEPX(l, x, y), STEPY(l, x, y));
+ }
+ }
+ else {
+ for (i = 0; i < st->lensnum; i++) {
+ l = &st->lenses[i];
+ recurse(st, STEPX(l, x, y), STEPY(l, x, y), length - 1, p);
+ }
+ }
+}
+
+/* Performs <count> random lens transformations, drawing a point at each
+ * iteration after the first 10.
+ */
+static void
+iterate(struct state *st, int count, int p)
+{
+ int i;
+ Lens *l;
+ int x = st->x;
+ int y = st->y;
+ int tx;
+
+# define STEP() \
+ l = &st->lenses[random() % st->lensnum]; \
+ tx = STEPX(l, x, y); \
+ y = STEPY(l, x, y); \
+ x = tx
+
+ for (i = 0; i < 10; i++) {
+ STEP();
+ }
+
+ for ( ; i < count; i++) {
+ STEP();
+ if (p == 0)
+ sp(st, x, y);
+ else
+ {
+ l = &st->lenses[p];
+ sp(st, STEPX(l, x, y), STEPY(l, x, y));
+ }
+ }
+
+# undef STEP
+
+ st->x = x;
+ st->y = y;
+}
+
+/* Come on and iterate, iterate, iterate and sing... *
+ * Yeah, this function just calls iterate, mutate, *
+ * and then draws everything. */
+static unsigned long
+ifs_draw (Display *dpy, Window window, void *closure)
+{
+ struct state *st = (struct state *) closure;
+ int i;
+ int xmin = st->xmin, xmax = st->xmax, ymin = st->ymin, ymax = st->ymax;
+ int partcolor, x, y;
+
+
+ /* erase whatever was drawn in the previous frame */
+ if (xmin <= xmax && ymin <= ymax) {
+ XSetForeground(st->dpy, st->gc, st->blackColor);
+ XFillRectangle(st->dpy, st->backbuffer, st->gc,
+ xmin, ymin,
+ xmax - xmin + 1, ymax - ymin + 1);
+ st->xmin = st->width + 1;
+ st->xmax = st->ymax = -1;
+ st->ymin = st->height + 1;
+ }
+
+ st->ccolour++;
+ st->ccolour %= st->ncolours;
+
+ /* calculate and draw points for this frame */
+ x = st->width << 7;
+ y = st->height << 7;
+
+ if (st->multi) {
+ for (i = 0; i < st->lensnum; i++) {
+ partcolor = st->ccolour * (i+1);
+ partcolor %= st->ncolours;
+ XSetForeground(st->dpy, st->gc, st->colours[partcolor].pixel);
+ memset(st->board, 0, st->widthb * st->height * sizeof(*st->board));
+ if (st->recurse)
+ recurse(st, x, y, st->length - 1, i);
+ else
+ iterate(st, pow(st->lensnum, st->length - 1), i);
+ if (st->npoints)
+ drawpoints(st);
+ }
+ }
+ else {
+
+ XSetForeground(st->dpy, st->gc, st->colours[st->ccolour].pixel);
+ memset(st->board, 0, st->widthb * st->height * sizeof(*st->board));
+ if (st->recurse)
+ recurse(st, x, y, st->length, 0);
+ else
+ iterate(st, pow(st->lensnum, st->length), 0);
+ if (st->npoints)
+ drawpoints(st);
+ }
+
+ /* if we just drew into a buffer, copy the changed area (including
+ * erased area) to screen */
+ if (st->backbuffer != st->window
+ && ((st->xmin <= st->xmax && st->ymin <= st->ymax)
+ || (xmin <= xmax && ymin <= ymax))) {
+ if (st->xmin < xmin) xmin = st->xmin;
+ if (st->xmax > xmax) xmax = st->xmax;
+ if (st->ymin < ymin) ymin = st->ymin;
+ if (st->ymax > ymax) ymax = st->ymax;
+ XCopyArea(st->dpy, st->backbuffer, st->window, st->gc,
+ xmin, ymin,
+ xmax - xmin + 1, ymax - ymin + 1,
+ xmin, ymin);
+ }
+
+ for(i = 0; i < st->lensnum; i++) {
+ mutate(st, &st->lenses[i]);
+ }
+
+ return st->delay;
+}
+
+static void
+ifs_reshape (Display *, Window, void *, unsigned int, unsigned int);
+
+static void *
+ifs_init (Display *d_arg, Window w_arg)
+{
+ struct state *st = (struct state *) calloc (1, sizeof(*st));
+ int i;
+ XWindowAttributes xgwa;
+
+ /* Initialise all this X shizzle */
+ st->dpy = d_arg;
+ st->window = w_arg;
+
+ st->blackColor = BlackPixel(st->dpy, DefaultScreen(st->dpy));
+ st->whiteColor = WhitePixel(st->dpy, DefaultScreen(st->dpy));
+ st->gc = XCreateGC(st->dpy, st->window, 0, NULL);
+
+ XGetWindowAttributes (st->dpy, st->window, &xgwa);
+ ifs_reshape(st->dpy, st->window, st, xgwa.width, xgwa.height);
+
+ st->ncolours = get_integer_resource(st->dpy, "colors", "Colors");
+ if (st->ncolours < st->lensnum)
+ st->ncolours = st->lensnum;
+ if (st->colours) free(st->colours);
+ if (st->ncolours < 1) st->ncolours = 1;
+ st->colours = (XColor *)calloc(st->ncolours, sizeof(XColor));
+ if (!st->colours) exit(1);
+ make_smooth_colormap (xgwa.screen, xgwa.visual, xgwa.colormap,
+ st->colours, &st->ncolours,
+ True, 0, False);
+
+ /* Initialize IFS data */
+
+ st->delay = get_integer_resource(st->dpy, "delay", "Delay");
+ st->length = get_integer_resource(st->dpy, "length", "Detail");
+ if (st->length < 0) st->length = 0;
+ st->mode = get_integer_resource(st->dpy, "mode", "Mode");
+
+ st->rotate = get_boolean_resource(st->dpy, "rotate", "Boolean");
+ st->scale = get_boolean_resource(st->dpy, "scale", "Boolean");
+ st->translate = get_boolean_resource(st->dpy, "translate", "Boolean");
+ st->recurse = get_boolean_resource(st->dpy, "recurse", "Boolean");
+ st->multi = get_boolean_resource(st->dpy, "multi", "Boolean");
+
+ st->lensnum = get_integer_resource(st->dpy, "lensnum", "Functions");
+ if (st->lenses) free (st->lenses);
+ st->lenses = (Lens *)calloc(st->lensnum, sizeof(Lens));
+ if (!st->lenses) exit(1);
+ for (i = 0; i < st->lensnum; i++) {
+ CreateLens(st,
+ myrandom(1)-0.5,
+ myrandom(1),
+ myrandom(4)-2,
+ myrandom(4)+2,
+ &st->lenses[i]);
+ }
+
+ return st;
+}
+
+static void
+ifs_reshape (Display *dpy, Window window, void *closure,
+ unsigned int w, unsigned int h)
+{
+ struct state *st = (struct state *)closure;
+ XWindowAttributes xgwa;
+
+ /* oh well, we need the screen depth anyway */
+ XGetWindowAttributes (st->dpy, st->window, &xgwa);
+
+ st->width = xgwa.width;
+ st->widthb = ((xgwa.width + 31) >> 5);
+ st->height = xgwa.height;
+ st->width8 = xgwa.width << 8;
+ st->height8 = xgwa.height << 8;
+
+ if (!st->xmax && !st->ymax && !st->xmin && !st->ymin) {
+ st->xmin = xgwa.width + 1;
+ st->xmax = st->ymax = -1;
+ st->ymin = xgwa.height + 1;
+ }
+
+ if (st->backbuffer != None && st->backbuffer != st->window) {
+ XFreePixmap(st->dpy, st->backbuffer);
+ st->backbuffer = None;
+ }
+
+ if (get_boolean_resource (st->dpy, "doubleBuffer", "Boolean")) {
+ st->backbuffer = XCreatePixmap(st->dpy, st->window, st->width, st->height, xgwa.depth);
+ XSetForeground(st->dpy, st->gc, st->blackColor);
+ XFillRectangle(st->dpy, st->backbuffer, st->gc,
+ 0, 0, st->width, st->height);
+ } else {
+ st->backbuffer = st->window;
+ XClearWindow(st->dpy, st->window);
+ }
+
+ if (st->board) free(st->board);
+ st->board = (unsigned int *)calloc(st->widthb * st->height, sizeof(unsigned int));
+ if (!st->board) exit(1);
+}
+
+static Bool
+ifs_event (Display *dpy, Window window, void *closure, XEvent *event)
+{
+ struct state *st = (struct state *)closure;
+ if (screenhack_event_helper (dpy, window, event))
+ {
+ int i;
+ for (i = 0; i < st->lensnum; i++) {
+ CreateLens(st,
+ myrandom(1)-0.5,
+ myrandom(1),
+ myrandom(4)-2,
+ myrandom(4)+2,
+ &st->lenses[i]);
+ }
+ return True;
+ }
+ return False;
+}
+
+static void
+ifs_free (Display *dpy, Window window, void *closure)
+{
+ struct state *st = (struct state *) closure;
+
+ if (st->board) free(st->board);
+ if (st->lenses) free(st->lenses);
+ if (st->colours) free(st->colours);
+ if (st->backbuffer != None && st->backbuffer != st->window)
+ XFreePixmap(st->dpy, st->backbuffer);
+ free(st);
+}
+
+XSCREENSAVER_MODULE ("IFS", ifs)
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-05-18 02:31:49 +0200