/* erase.c: Erase the screen in various more or less interesting ways.
- * (c) 1997 by Johannes Keukelaar <johannes@nada.kth.se>
- * Permission to use in any way granted. Provided "as is" without expressed
- * or implied warranty. NO WARRANTY, NO EXPRESSION OF SUITABILITY FOR ANY
- * PURPOSE. (I.e.: Use in any way, but at your own risk!)
+ * Copyright (c) 1997-2008 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.
+ *
+ * Portions (c) 1997 by Johannes Keukelaar <johannes@nada.kth.se>:
+ * Permission to use in any way granted. Provided "as is" without expressed
+ * or implied warranty. NO WARRANTY, NO EXPRESSION OF SUITABILITY FOR ANY
+ * PURPOSE. (I.e.: Use in any way, but at your own risk!)
*/
#include "utils.h"
#include "yarandom.h"
#include "usleep.h"
#include "resources.h"
+#include "erase.h"
+#include <sys/time.h> /* for gettimeofday() */
+
+extern char *progname;
#undef countof
#define countof(x) (sizeof(x)/sizeof(*(x)))
-typedef void (*Eraser) (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity);
+typedef void (*Eraser) (eraser_state *);
+
+struct eraser_state {
+ Display *dpy;
+ Window window;
+ GC fg_gc, bg_gc;
+ int width, height;
+ Eraser fn;
+
+ double start_time, stop_time;
+ double ratio, prev_ratio;
+
+ /* data for random_lines, venetian, random_squares */
+ Bool horiz_p;
+ Bool flip_p;
+ int nlines, *lines;
+
+ /* data for triple_wipe, quad_wipe */
+ Bool flip_x, flip_y;
+
+ /* data for circle_wipe, three_circle_wipe */
+ int start;
+
+ /* data for random_squares */
+ int cols;
+
+};
+
+
+static double
+double_time (void)
+{
+ struct timeval now;
+# ifdef GETTIMEOFDAY_TWO_ARGS
+ struct timezone tzp;
+ gettimeofday(&now, &tzp);
+# else
+ gettimeofday(&now);
+# endif
+
+ return (now.tv_sec + ((double) now.tv_usec * 0.000001));
+}
static void
-random_lines (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+random_lines (eraser_state *st)
{
- Bool horiz_p = (random() & 1);
- int max = (horiz_p ? height : width);
- int *lines = (int *) calloc(max, sizeof(*lines));
int i;
- for (i = 0; i < max; i++)
- lines[i] = i;
-
- for (i = 0; i < max; i++)
+ if (! st->lines) /* first time */
{
- int t, r;
- t = lines[i];
- r = random() % max;
- lines[i] = lines[r];
- lines[r] = t;
+ st->horiz_p = (random() & 1);
+ st->nlines = (st->horiz_p ? st->height : st->width);
+ st->lines = (int *) calloc (st->nlines, sizeof(*st->lines));
+
+ for (i = 0; i < st->nlines; i++) /* every line */
+ st->lines[i] = i;
+
+ for (i = 0; i < st->nlines; i++) /* shuffle */
+ {
+ int t, r;
+ t = st->lines[i];
+ r = random() % st->nlines;
+ st->lines[i] = st->lines[r];
+ st->lines[r] = t;
+ }
}
- for (i = 0; i < max; i++)
- {
- if (horiz_p)
- XDrawLine (dpy, window, gc, 0, lines[i], width, lines[i]);
+ for (i = st->nlines * st->prev_ratio;
+ i < st->nlines * st->ratio;
+ i++)
+ {
+ if (st->horiz_p)
+ XDrawLine (st->dpy, st->window, st->bg_gc,
+ 0, st->lines[i], st->width, st->lines[i]);
else
- XDrawLine (dpy, window, gc, lines[i], 0, lines[i], height);
+ XDrawLine (st->dpy, st->window, st->bg_gc,
+ st->lines[i], 0, st->lines[i], st->height);
+ }
- XSync (dpy, False);
- if (delay > 0 && ((i % granularity) == 0))
- usleep (delay * granularity);
+ if (st->ratio >= 1.0)
+ {
+ free (st->lines);
+ st->lines = 0;
}
- free(lines);
}
static void
-venetian (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+venetian (eraser_state *st)
{
- Bool horiz_p = (random() & 1);
- Bool flip_p = (random() & 1);
- int max = (horiz_p ? height : width);
- int *lines = (int *) calloc(max, sizeof(*lines));
- int i, j;
-
- granularity /= 6;
-
- j = 0;
- for (i = 0; i < max*2; i++)
+ int i;
+ if (st->ratio == 0.0)
{
- int line = ((i / 16) * 16) - ((i % 16) * 15);
- if (line >= 0 && line < max)
- lines[j++] = (flip_p ? max - line : line);
+ int j = 0;
+ st->horiz_p = (random() & 1);
+ st->flip_p = (random() & 1);
+ st->nlines = (st->horiz_p ? st->height : st->width);
+ st->lines = (int *) calloc (st->nlines, sizeof(*st->lines));
+
+ for (i = 0; i < st->nlines * 2; i++)
+ {
+ int line = ((i / 16) * 16) - ((i % 16) * 15);
+ if (line >= 0 && line < st->nlines)
+ st->lines[j++] = (st->flip_p ? st->nlines - line : line);
+ }
}
- for (i = 0; i < max; i++)
- {
- if (horiz_p)
- XDrawLine (dpy, window, gc, 0, lines[i], width, lines[i]);
+
+ for (i = st->nlines * st->prev_ratio;
+ i < st->nlines * st->ratio;
+ i++)
+ {
+ if (st->horiz_p)
+ XDrawLine (st->dpy, st->window, st->bg_gc,
+ 0, st->lines[i], st->width, st->lines[i]);
else
- XDrawLine (dpy, window, gc, lines[i], 0, lines[i], height);
+ XDrawLine (st->dpy, st->window, st->bg_gc,
+ st->lines[i], 0, st->lines[i], st->height);
+ }
- XSync (dpy, False);
- if (delay > 0 && ((i % granularity) == 0))
- usleep (delay * granularity);
+ if (st->ratio >= 1.0)
+ {
+ free (st->lines);
+ st->lines = 0;
}
- free(lines);
}
static void
-triple_wipe (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+triple_wipe (eraser_state *st)
{
- Bool flip_x = random() & 1;
- Bool flip_y = random() & 1;
- int max = width + (height / 2);
- int *lines = (int *)calloc(max, sizeof(int));
int i;
+ if (st->ratio == 0.0)
+ {
+ st->flip_x = random() & 1;
+ st->flip_y = random() & 1;
+ st->nlines = st->width + (st->height / 2);
+ st->lines = (int *) calloc (st->nlines, sizeof(*st->lines));
+
+ for (i = 0; i < st->width / 2; i++)
+ st->lines[i] = i * 2 + st->height;
+ for (i = 0; i < st->height / 2; i++)
+ st->lines[i + st->width / 2] = i*2;
+ for (i = 0; i < st->width / 2; i++)
+ st->lines[i + st->width / 2 + st->height / 2] =
+ st->width - i * 2 - (st->width % 2 ? 0 : 1) + st->height;
+ }
- for(i = 0; i < width/2; i++)
- lines[i] = i*2+height;
- for(i = 0; i < height/2; i++)
- lines[i+width/2] = i*2;
- for(i = 0; i < width/2; i++)
- lines[i+width/2+height/2] = width-i*2-(width%2?0:1)+height;
-
- granularity /= 6;
-
- for (i = 0; i < max; i++)
- {
+ for (i = st->nlines * st->prev_ratio;
+ i < st->nlines * st->ratio;
+ i++)
+ {
int x, y, x2, y2;
- if (lines[i] < height)
- x = 0, y = lines[i], x2 = width, y2 = y;
+
+ if (st->lines[i] < st->height)
+ x = 0, y = st->lines[i], x2 = st->width, y2 = y;
else
- x = lines[i]-height, y = 0, x2 = x, y2 = height;
+ x = st->lines[i]-st->height, y = 0, x2 = x, y2 = st->height;
- if (flip_x)
- x = width-x, x2 = width-x2;
- if (flip_y)
- y = height-y, y2 = height-y2;
+ if (st->flip_x)
+ x = st->width - x, x2 = st->width - x2;
+ if (st->flip_y)
+ y = st->height - y, y2 = st->height - y2;
- XDrawLine (dpy, window, gc, x, y, x2, y2);
- XSync (dpy, False);
- if (delay > 0 && ((i % granularity) == 0))
- usleep (delay*granularity);
+ XDrawLine (st->dpy, st->window, st->bg_gc, x, y, x2, y2);
+ }
+
+ if (st->ratio >= 1.0)
+ {
+ free (st->lines);
+ st->lines = 0;
}
- free(lines);
}
static void
-quad_wipe (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+quad_wipe (eraser_state *st)
{
- Bool flip_x = random() & 1;
- Bool flip_y = random() & 1;
- int max = width + height;
- int *lines = (int *)calloc(max, sizeof(int));
int i;
-
- granularity /= 3;
-
- for (i = 0; i < max/4; i++)
+ if (st->ratio == 0.0)
{
- lines[i*4] = i*2;
- lines[i*4+1] = height-i*2-(height%2?0:1);
- lines[i*4+2] = height+i*2;
- lines[i*4+3] = height+width-i*2-(width%2?0:1);
+ st->flip_x = random() & 1;
+ st->flip_y = random() & 1;
+ st->nlines = st->width + st->height;
+ st->lines = (int *) calloc (st->nlines, sizeof(*st->lines));
+
+ for (i = 0; i < st->nlines/4; i++)
+ {
+ st->lines[i*4] = i*2;
+ st->lines[i*4+1] = st->height - i*2 - (st->height % 2 ? 0 : 1);
+ st->lines[i*4+2] = st->height + i*2;
+ st->lines[i*4+3] = st->height + st->width - i*2
+ - (st->width % 2 ? 0 : 1);
+ }
}
- for (i = 0; i < max; i++)
- {
+ for (i = st->nlines * st->prev_ratio;
+ i < st->nlines * st->ratio;
+ i++)
+ {
int x, y, x2, y2;
- if (lines[i] < height)
- x = 0, y = lines[i], x2 = width, y2 = y;
+ if (st->lines[i] < st->height)
+ x = 0, y = st->lines[i], x2 = st->width, y2 = y;
else
- x = lines[i]-height, y = 0, x2 = x, y2 = height;
+ x = st->lines[i] - st->height, y = 0, x2 = x, y2 = st->height;
- if (flip_x)
- x = width-x, x2 = width-x2;
- if (flip_y)
- y = height-y, y2 = height-y2;
+ if (st->flip_x)
+ x = st->width-x, x2 = st->width-x2;
+ if (st->flip_y)
+ y = st->height-y, y2 = st->height-y2;
- XDrawLine (dpy, window, gc, x, y, x2, y2);
- XSync (dpy, False);
- if (delay > 0 && ((i % granularity) == 0))
- usleep (delay*granularity);
+ XDrawLine (st->dpy, st->window, st->bg_gc, x, y, x2, y2);
}
- free(lines);
-}
+ if (st->ratio >= 1.0)
+ {
+ free (st->lines);
+ st->lines = 0;
+ }
+}
static void
-circle_wipe (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+circle_wipe (eraser_state *st)
{
- int full = 360 * 64;
- int inc = full / 64;
- int start = random() % full;
- int rad = (width > height ? width : height);
- int i;
- if (random() & 1)
- inc = -inc;
- for (i = (inc > 0 ? 0 : full);
- (inc > 0 ? i < full : i > 0);
- i += inc)
+ int rad = (st->width > st->height ? st->width : st->height);
+ int max = 360 * 64;
+ int th, oth;
+
+ if (st->ratio == 0.0)
+ {
+ st->flip_p = random() & 1;
+ st->start = random() % max;
+ }
+
+ th = max * st->ratio;
+ oth = max * st->prev_ratio;
+ if (st->flip_p)
{
- XFillArc(dpy, window, gc,
- (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (i+start) % full, inc);
- XFlush (dpy);
- usleep (delay*granularity);
+ th = max - th;
+ oth = max - oth;
}
+ XFillArc (st->dpy, st->window, st->bg_gc,
+ (st->width / 2) - rad,
+ (st->height / 2) - rad,
+ rad*2, rad*2,
+ (st->start + oth) % max,
+ th-oth);
}
static void
-three_circle_wipe (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+three_circle_wipe (eraser_state *st)
{
+ int rad = (st->width > st->height ? st->width : st->height);
+ int max = 360 * 64;
+ int th, oth;
int i;
- int full = 360 * 64;
- int q = full / 6;
- int q2 = q * 2;
- int inc = full / 240;
- int start = random() % q;
- int rad = (width > height ? width : height);
-
- for (i = 0; i < q; i += inc)
+
+ if (st->ratio == 0.0)
+ st->start = random() % max;
+
+ th = max/6 * st->ratio;
+ oth = max/6 * st->prev_ratio;
+
+ for (i = 0; i < 3; i++)
{
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start+i) % full, inc);
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start-i) % full, -inc);
-
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start+q2+i) % full, inc);
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start+q2-i) % full, -inc);
-
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start+q2+q2+i) % full, inc);
- XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
- (start+q2+q2-i) % full, -inc);
-
- XSync (dpy, False);
- usleep (delay*granularity);
+ int off = i * max / 3;
+ XFillArc (st->dpy, st->window, st->bg_gc,
+ (st->width / 2) - rad,
+ (st->height / 2) - rad,
+ rad*2, rad*2,
+ (st->start + off + oth) % max,
+ th-oth);
+ XFillArc (st->dpy, st->window, st->bg_gc,
+ (st->width / 2) - rad,
+ (st->height / 2) - rad,
+ rad*2, rad*2,
+ (st->start + off - oth) % max,
+ oth-th);
}
}
static void
-squaretate (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+squaretate (eraser_state *st)
{
- int steps = (((width > height ? width : width) * 2) / granularity);
- int i;
- Bool flip = random() & 1;
+ int max = ((st->width > st->height ? st->width : st->height) * 2);
+ XPoint points [3];
+ int i = max * st->ratio;
+
+ if (st->ratio == 0.0)
+ st->flip_p = random() & 1;
+
+# define DRAW() \
+ if (st->flip_p) { \
+ points[0].x = st->width - points[0].x; \
+ points[1].x = st->width - points[1].x; \
+ points[2].x = st->width - points[2].x; \
+ } \
+ XFillPolygon (st->dpy, st->window, st->bg_gc, \
+ points, 3, Convex, CoordModeOrigin)
+
+ points[0].x = 0;
+ points[0].y = 0;
+ points[1].x = st->width;
+ points[1].y = 0;
+ points[2].x = 0;
+ points[2].y = points[0].y + ((i * st->height) / max);
+ DRAW();
+
+ points[0].x = 0;
+ points[0].y = 0;
+ points[1].x = 0;
+ points[1].y = st->height;
+ points[2].x = ((i * st->width) / max);
+ points[2].y = st->height;
+ DRAW();
+
+ points[0].x = st->width;
+ points[0].y = st->height;
+ points[1].x = 0;
+ points[1].y = st->height;
+ points[2].x = st->width;
+ points[2].y = st->height - ((i * st->height) / max);
+ DRAW();
+
+ points[0].x = st->width;
+ points[0].y = st->height;
+ points[1].x = st->width;
+ points[1].y = 0;
+ points[2].x = st->width - ((i * st->width) / max);
+ points[2].y = 0;
+ DRAW();
+# undef DRAW
+}
-#define DRAW() \
- if (flip) { \
- points[0].x = width-points[0].x; \
- points[1].x = width-points[1].x; \
- points[2].x = width-points[2].x; } \
- XFillPolygon (dpy, window, gc, points, 3, Convex, CoordModeOrigin)
- for (i = 0; i < steps; i++)
+static void
+fizzle (eraser_state *st)
+{
+ XPoint *points;
+ int chunk = 20000;
+ int npoints = st->width * st->height * 4;
+ npoints *= (st->ratio - st->prev_ratio);
+
+ points = (XPoint *) malloc (chunk * sizeof(*points));
+ if (! points) return;
+
+ while (npoints > 0)
{
- XPoint points [3];
- points[0].x = 0;
- points[0].y = 0;
- points[1].x = width;
- points[1].y = 0;
- points[2].x = 0;
- points[2].y = points[0].y + ((i * height) / steps);
- DRAW();
-
- points[0].x = 0;
- points[0].y = 0;
- points[1].x = 0;
- points[1].y = height;
- points[2].x = ((i * width) / steps);
- points[2].y = height;
- DRAW();
-
- points[0].x = width;
- points[0].y = height;
- points[1].x = 0;
- points[1].y = height;
- points[2].x = width;
- points[2].y = height - ((i * height) / steps);
- DRAW();
-
- points[0].x = width;
- points[0].y = height;
- points[1].x = width;
- points[1].y = 0;
- points[2].x = width - ((i * width) / steps);
- points[2].y = 0;
- DRAW();
-
- XSync (dpy, True);
- if (delay > 0)
- usleep (delay * granularity);
- }
-#undef DRAW
+ int remain = (chunk > npoints ? npoints : chunk);
+ int i;
+ for (i = 0; i < remain; i++)
+ {
+ int r = random();
+ points[i].x = r % st->width;
+ points[i].y = (r >> 16) % st->height;
+ }
+ XDrawPoints (st->dpy, st->window, st->bg_gc,
+ points, remain, CoordModeOrigin);
+ npoints -= remain;
+ }
+ free (points);
}
-/* from Frederick Roeber <roeber@netscape.com> */
static void
-fizzle (Display *dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+spiral (eraser_state *st)
{
- /* These dimensions must be prime numbers. They should be roughly the
- square root of the width and height. */
-# define BX 31
-# define BY 31
-# define SIZE (BX*BY)
-
- int array[SIZE];
- int i, j;
- XPoint *skews;
- int nx, ny;
-
- /* Distribute the numbers [0,SIZE) randomly in the array */
- {
- int indices[SIZE];
-
- for( i = 0; i < SIZE; i++ ) {
- array[i] = -1;
- indices[i] = i;
- }
-
- for( i = 0; i < SIZE; i++ ) {
- j = random()%(SIZE-i);
- array[indices[j]] = i;
- indices[j] = indices[SIZE-i-1];
- }
- }
-
- /* nx, ny are the number of cells across and down, rounded up */
- nx = width / BX + (0 == (width %BX) ? 0 : 1);
- ny = height / BY + (0 == (height%BY) ? 0 : 1);
- skews = (XPoint *)malloc(sizeof(XPoint) * (nx*ny));
- if( (XPoint *)0 != skews ) {
- for( i = 0; i < nx; i++ ) {
- for( j = 0; j < ny; j++ ) {
- skews[j * nx + i].x = random()%BX;
- skews[j * nx + i].y = random()%BY;
- }
- }
- }
+ int max_radius = (st->width > st->height ? st->width : st->height) * 0.7;
+ int loops = 10;
+ float max_th = M_PI * 2 * loops;
+ int i;
+ int steps = 360 * loops / 4;
+ float off;
-# define SKEWX(cx, cy) (((XPoint *)0 == skews)?0:skews[cy*nx + cx].x)
-# define SKEWY(cx, cy) (((XPoint *)0 == skews)?0:skews[cy*nx + cx].y)
+ if (st->ratio == 0.0)
+ {
+ st->flip_p = random() & 1;
+ st->start = random() % 360;
+ }
- for( i = 0; i < SIZE; i++ ) {
- int x = array[i] % BX;
- int y = array[i] / BX;
+ off = st->start * M_PI / 180;
+ for (i = steps * st->prev_ratio;
+ i < steps * st->ratio;
+ i++)
{
- int iy, cy;
- for( iy = 0, cy = 0; iy < height; iy += BY, cy++ ) {
- int ix, cx;
- for( ix = 0, cx = 0; ix < width; ix += BX, cx++ ) {
- int xx = ix + (SKEWX(cx, cy) + x*((cx%(BX-1))+1))%BX;
- int yy = iy + (SKEWY(cx, cy) + y*((cy%(BY-1))+1))%BY;
- XDrawPoint(dpy, window, gc, xx, yy);
+ float th1 = i * max_th / steps;
+ float th2 = (i+1) * max_th / steps;
+ int r1 = i * max_radius / steps;
+ int r2 = (i+1) * max_radius / steps;
+ XPoint points[3];
+
+ if (st->flip_p)
+ {
+ th1 = max_th - th1;
+ th2 = max_th - th2;
}
- }
+
+ points[0].x = st->width / 2;
+ points[0].y = st->height / 2;
+ points[1].x = points[0].x + r1 * cos (off + th1);
+ points[1].y = points[0].y + r1 * sin (off + th1);
+ points[2].x = points[0].x + r2 * cos (off + th2);
+ points[2].y = points[0].y + r2 * sin (off + th2);
+/* XFillRectangle(st->dpy, st->window, st->fg_gc,0,0,st->width, st->height);*/
+ XFillPolygon (st->dpy, st->window, st->bg_gc,
+ points, 3, Convex, CoordModeOrigin);
}
+}
+
+
+static void
+random_squares (eraser_state *st)
+{
+ int i, size, rows;
- if( (BX-1) == (i%BX) ) {
- XSync (dpy, False);
- usleep (delay*granularity);
+ if (st->ratio == 0.0)
+ {
+ st->cols = 10 + random() % 30;
+ size = st->width / st->cols;
+ rows = (size ? (st->height / size) : 0) + 1;
+ st->nlines = st->cols * rows;
+ st->lines = (int *) calloc (st->nlines, sizeof(*st->lines));
+
+ for (i = 0; i < st->nlines; i++) /* every square */
+ st->lines[i] = i;
+
+ for (i = 0; i < st->nlines; i++) /* shuffle */
+ {
+ int t, r;
+ t = st->lines[i];
+ r = random() % st->nlines;
+ st->lines[i] = st->lines[r];
+ st->lines[r] = t;
+ }
}
- }
-# undef SKEWX
-# undef SKEWY
+ size = st->width / st->cols;
+ rows = (size ? (st->height / size) : 0) + 1;
- if( (XPoint *)0 != skews ) {
- free(skews);
- }
+ for (i = st->nlines * st->prev_ratio;
+ i < st->nlines * st->ratio;
+ i++)
+ {
+ int x = st->lines[i] % st->cols;
+ int y = st->lines[i] / st->cols;
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ st->width * x / st->cols,
+ st->height * y / rows,
+ size+1, size+1);
+ }
-# undef BX
-# undef BY
-# undef SIZE
+ if (st->ratio >= 1.0)
+ {
+ free (st->lines);
+ st->lines = 0;
+ }
}
-#undef MAX
-#undef MIN
-#define MAX(a,b) ((a)>(b)?(a):(b))
-#define MIN(a,b) ((a)<(b)?(a):(b))
-
-/* from David Bagley <bagleyd@tux.org> */
+/* I first saw something like this, albeit in reverse, in an early Tetris
+ implementation for the Mac.
+ -- Torbjörn Andersson <torbjorn@dev.eurotime.se>
+ */
static void
-random_squares(Display * dpy, Window window, GC gc,
- int width, int height, int delay, int granularity)
+slide_lines (eraser_state *st)
{
- int randsize = MAX(1, MIN(width, height) / (16 + (random() % 32)));
- int max = (height / randsize + 1) * (width / randsize + 1);
- int *squares = (int *) calloc(max, sizeof (*squares));
- int i;
- int columns = width / randsize + 1; /* Add an extra for roundoff */
+ int max = st->width * 1.1;
+ int nlines = 40;
+ int h = st->height / nlines;
+ int y, step;
+ int tick = 0;
- for (i = 0; i < max; i++)
- squares[i] = i;
+ if (h < 10)
+ h = 10;
- for (i = 0; i < max; i++)
+ step = (max * st->ratio) - (max * st->prev_ratio);
+ if (step <= 0)
+ step = 1;
+
+ for (y = 0; y < st->height; y += h)
{
- int t, r;
- t = squares[i];
- r = random() % max;
- squares[i] = squares[r];
- squares[r] = t;
+ if (st->width <= step)
+ ;
+ else if (tick & 1)
+ {
+ XCopyArea (st->dpy, st->window, st->window, st->fg_gc,
+ 0, y, st->width-step, h, step, y);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, y, step, h);
+ }
+ else
+ {
+ XCopyArea (st->dpy, st->window, st->window, st->fg_gc,
+ step, y, st->width-step, h, 0, y);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ st->width-step, y, step, h);
+ }
+
+ tick++;
}
+}
- for (i = 0; i < max; i++)
+
+/* from Frederick Roeber <roeber@xigo.com> */
+static void
+losira (eraser_state *st)
+{
+ double mode1 = 0.55;
+ double mode2 = mode1 + 0.30;
+ double mode3 = 1.0;
+ int radius = 10;
+
+ if (st->ratio < mode1) /* squeeze from the sides */
+ {
+ double ratio = st->ratio / mode1;
+ double prev_ratio = st->prev_ratio / mode1;
+ int max = st->width / 2;
+ int step = (max * ratio) - (max * prev_ratio);
+
+ if (step <= 0)
+ step = 1;
+
+ /* pull from left */
+ XCopyArea (st->dpy, st->window, st->window, st->fg_gc,
+ 0, 0, max - step, st->height, step, 0);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, 0, max * ratio, st->height);
+
+ /* pull from right */
+ XCopyArea (st->dpy, st->window, st->window, st->fg_gc,
+ max+step, 0, max - step, st->height, max, 0);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ max + max*(1-ratio), 0, max, st->height);
+
+ /* expand white from center */
+ XFillRectangle (st->dpy, st->window, st->fg_gc,
+ max - (radius * ratio), 0,
+ radius * ratio * 2, st->height);
+ }
+ else if (st->ratio < mode2) /* squeeze from the top/bottom */
+ {
+ double ratio = (st->ratio - mode1) / (mode2 - mode1);
+ int max = st->height / 2;
+
+ /* fill middle */
+ XFillRectangle (st->dpy, st->window, st->fg_gc,
+ st->width/2 - radius,
+ max * ratio,
+ radius*2, st->height * (1 - ratio));
+
+ /* fill left and right */
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, 0, st->width/2 - radius, st->height);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ st->width/2 + radius, 0, st->width/2, st->height);
+
+ /* fill top and bottom */
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, 0, st->width, max * ratio);
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, st->height - (max * ratio),
+ st->width, max);
+
+ /* cap top */
+ XFillArc (st->dpy, st->window, st->fg_gc,
+ st->width/2 - radius,
+ max * ratio - radius,
+ radius*2, radius*2,
+ 0, 180*64);
+
+ /* cap bottom */
+ XFillArc (st->dpy, st->window, st->fg_gc,
+ st->width/2 - radius,
+ st->height - (max * ratio + radius),
+ radius*2, radius*2,
+ 180*64, 180*64);
+ }
+ else /* starburst */
{
- XFillRectangle(dpy, window, gc,
- (squares[i] % columns) * randsize,
- (squares[i] / columns) * randsize,
- randsize, randsize);
-
- XSync(dpy, False);
- if (delay > 0 && ((i % granularity) == 0))
- usleep(delay * granularity);
+ double ratio = (st->ratio - mode2) / (mode3 - mode2);
+ double r2 = ratio * radius * 4;
+ XArc arc[9];
+ int i;
+ int angle = 360*64/countof(arc);
+
+ for (i = 0; i < countof(arc); i++)
+ {
+ double th;
+ arc[i].angle1 = angle * i;
+ arc[i].angle2 = angle;
+ arc[i].width = radius*2 * (1 + ratio);
+ arc[i].height = radius*2 * (1 + ratio);
+ arc[i].x = st->width / 2 - radius;
+ arc[i].y = st->height / 2 - radius;
+
+ th = ((arc[i].angle1 + (arc[i].angle2 / 2)) / 64.0 / 180 * M_PI);
+
+ arc[i].x += r2 * cos (th);
+ arc[i].y -= r2 * sin (th);
+ }
+
+ XFillRectangle (st->dpy, st->window, st->bg_gc,
+ 0, 0, st->width, st->height);
+ XFillArcs (st->dpy, st->window, st->fg_gc, arc, countof(arc));
}
- free(squares);
}
three_circle_wipe,
squaretate,
fizzle,
+ spiral,
random_squares,
+ slide_lines,
+ losira,
};
-void
-erase_window(Display *dpy, Window window, GC gc,
- int width, int height, int mode, int delay)
-{
- int granularity = 25;
-
- if (mode < 0 || mode >= countof(erasers))
- mode = random() % countof(erasers);
- (*(erasers[mode])) (dpy, window, gc, width, height, delay, granularity);
- XClearWindow (dpy, window);
- XSync(dpy, False);
-}
-
-
-void
-erase_full_window(Display *dpy, Window window)
+static eraser_state *
+eraser_init (Display *dpy, Window window)
{
+ eraser_state *st = (eraser_state *) calloc (1, sizeof(*st));
XWindowAttributes xgwa;
XGCValues gcv;
- GC erase_gc;
- XColor black;
- int erase_speed, erase_mode;
+ unsigned long fg, bg;
+ double duration;
+ int which;
char *s;
- s = get_string_resource("eraseSpeed", "Integer");
- if (s && *s)
- erase_speed = get_integer_resource("eraseSpeed", "Integer");
- else
- erase_speed = 400;
- if (s) free(s);
+ st->dpy = dpy;
+ st->window = window;
- s = get_string_resource("eraseMode", "Integer");
- if (s && *s)
- erase_mode = get_integer_resource("eraseMode", "Integer");
+ XGetWindowAttributes (dpy, window, &xgwa);
+ st->width = xgwa.width;
+ st->height = xgwa.height;
+
+ bg = get_pixel_resource (dpy, xgwa.colormap, "background", "Background");
+ fg = get_pixel_resource (dpy, xgwa.colormap, "foreground", "Foreground");
+
+ gcv.foreground = fg;
+ gcv.background = bg;
+ st->fg_gc = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv);
+ gcv.foreground = bg;
+ gcv.background = fg;
+ st->bg_gc = XCreateGC (dpy, window, GCForeground|GCBackground, &gcv);
+
+# ifdef HAVE_COCOA
+ /* Pretty much all of these leave turds if AA is on. */
+ jwxyz_XSetAntiAliasing (st->dpy, st->fg_gc, False);
+ jwxyz_XSetAntiAliasing (st->dpy, st->bg_gc, False);
+# endif
+
+ s = get_string_resource (dpy, "eraseMode", "Integer");
+ if (!s || !*s)
+ which = -1;
else
- erase_mode = -1;
- if (s) free(s);
+ which = get_integer_resource(dpy, "eraseMode", "Integer");
- XGetWindowAttributes (dpy, window, &xgwa);
- black.flags = DoRed|DoGreen|DoBlue;
- black.red = black.green = black.blue = 0;
- XAllocColor(dpy, xgwa.colormap, &black);
- gcv.foreground = black.pixel;
- erase_gc = XCreateGC (dpy, window, GCForeground, &gcv);
- erase_window (dpy, window, erase_gc, xgwa.width, xgwa.height,
- erase_mode, erase_speed);
- XFreeColors(dpy, xgwa.colormap, &black.pixel, 1, 0);
- XFreeGC(dpy, erase_gc);
+ if (which < 0 || which >= countof(erasers))
+ which = random() % countof(erasers);
+ st->fn = erasers[which];
+
+ duration = get_float_resource (dpy, "eraseSeconds", "Float");
+ if (duration < 0.1 || duration > 10)
+ duration = 1;
+
+ st->start_time = double_time();
+ st->stop_time = st->start_time + duration;
+
+ XSync (st->dpy, False);
+
+ return st;
}
-\f
-#if 0
-#include "screenhack.h"
+static Bool
+eraser_draw (eraser_state *st, Bool first_p)
+{
+ double now = (first_p ? st->start_time : double_time());
+ double duration = st->stop_time - st->start_time;
-char *progclass = "Erase";
-char *defaults [] = {
- 0
-};
+ st->prev_ratio = st->ratio;
+ st->ratio = (now - st->start_time) / duration;
+
+ if (st->ratio > 1.0)
+ st->ratio = 1.0;
+
+ st->fn (st);
+ XSync (st->dpy, False);
-XrmOptionDescRec options [] = {{0}};
-int options_size = 0;
+ return (st->ratio < 1.0);
+}
-void
-screenhack (dpy, window)
- Display *dpy;
- Window window;
+static void
+eraser_free (eraser_state *st)
{
- int delay = 500000;
- XGCValues gcv;
- GC gc;
- XColor white;
- XWindowAttributes xgwa;
- XGetWindowAttributes (dpy, window, &xgwa);
- white.flags = DoRed|DoGreen|DoBlue;
- white.red = white.green = white.blue = 0xFFFF;
- XAllocColor(dpy, xgwa.colormap, &white);
- gcv.foreground = white.pixel;
- gc = XCreateGC (dpy, window, GCForeground, &gcv);
+ XClearWindow (st->dpy, st->window);
+ XFreeGC (st->dpy, st->fg_gc);
+ XFreeGC (st->dpy, st->bg_gc);
+ free (st);
+}
- while (1)
+eraser_state *
+erase_window (Display *dpy, Window window, eraser_state *st)
+{
+ Bool first_p = False;
+ if (! st)
{
- XFillRectangle(dpy, window, gc, 0, 0, 1280, 1024);
- XSync (dpy, False);
- usleep (delay);
- erase_full_window(dpy, window);
- XSync (dpy, False);
- usleep (delay);
-
+ first_p = True;
+ st = eraser_init (dpy, window);
}
+ if (! eraser_draw (st, first_p))
+ {
+ eraser_free (st);
+ st = 0;
+ }
+ return st;
}
-
-#endif
projects / xscreensaver / blobdiff