1 /* ripples, Copyright (c) 1999 Ian McConnell <ian@emit.demon.co.uk>
3 * Permission to use, copy, modify, distribute, and sell this software and its
4 * documentation for any purpose is hereby granted without fee, provided that
5 * the above copyright notice appear in all copies and that both that
6 * copyright notice and this permission notice appear in supporting
7 * documentation. No representations are made about the suitability of this
8 * software for any purpose. It is provided "as is" without express or
13 * "Water" ripples that can cross and interfere with each other.
15 * I can't remember where I got this idea from, but it's been around for a
16 * while in various demos. Some inspiration from
17 * water.txt by Tom Hammersley,tomh@globalnet.co.uk
20 * -delay usleep every iteration
21 * -rate Add one drop every "rate" iterations
22 * -box Add big square splash every "box" iters (not very good)
23 * -water Ripples on a grabbed background image
24 * -foreground Interpolate ripples between these two colors
26 * -oily Psychedelic colours like man
27 * -stir Add a regular pattern of drops
28 * -fluidity Between 0 and 16. 16 = big drops
29 * -light Hack to add lighting effect
31 * Code mainly hacked from xflame and decayscreen.
35 * 13 Oct 1999: Initial hack
36 * 30 Oct 1999: Speeded up graphics with dirty buffer. Returned to using
37 * putpixel for greater portability
38 * Added a variety of methods for splashing screen.
39 * 31 Oct 1999: Added in lighting hack
40 * 13 Nov 1999: Speed up tweaks
41 * Adjust "light" for different bits per colour (-water only)
42 * 09 Oct 2016: Updated for new xshm.c
47 #include "screenhack.h"
49 typedef enum {ripple_drop, ripple_blob, ripple_box, ripple_stir} ripple_mode;
61 XImage *orig_map, *buffer_map;
68 int width, height; /* ripple size */
69 int bigwidth, bigheight; /* screen size */
72 short *bufferA, *bufferB, *temp;
75 double cos_tab[TABLE];
79 unsigned long rmask; /* This builds on the warp effect by adding */
80 unsigned long gmask; /* in a lighting effect: brighten pixels by an */
81 unsigned long bmask; /* amount corresponding to the vertical gradient */
92 int iterations, delay, rate, box, oily, stir, fluidity;
96 void (*draw_transparent) (struct state *st, short *src);
98 async_load_state *img_loader;
100 XShmSegmentInfo shm_info;
104 /* Distribution of drops: many little ones and a few big ones. */
105 static const double drop_dist[] =
106 {0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.6};
109 /* How hard to hit the water */
112 #define MIN(x, y) ((x) < (y) ? (x) : (y))
114 #define MAX(x, y) ((x) > (y) ? (x) : (y))
116 #define DIRTY 3 /* dirty >= 2, 1 = restore original pixel, 0 = leave alone */
118 /* From fortune(6) */
119 /* -- really weird C code to count the number of bits in a word */
120 #define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
121 #define BX_(x) ((x) - (((x)>>1)&0x77777777) \
122 - (((x)>>2)&0x33333333) \
123 - (((x)>>3)&0x11111111))
126 static unsigned long grayscale(struct state *st, unsigned long color);
128 /* ------------------------------------------- */
132 map_color(struct state *st, int grey)
135 grey = st->ncolors * abs(grey) / (SPLASH/4);
136 if (grey > st->ncolors)
140 return st->ctab[grey];
145 draw_ripple(struct state *st, short *src)
148 char *dirty = st->dirty_buffer;
150 for (down = 0; down < st->height - 1; down++, src += 1, dirty += 1)
151 for (across = 0; across < st->width - 1; across++, src++, dirty++) {
154 v2 = (int)*(src + 1);
155 v3 = (int)*(src + st->width);
156 v4 = (int)*(src + st->width + 1);
157 if ((v1 == 0 && v2 == 0 && v3 == 0 && v4 == 0)) {
166 dx = ((v3 - v1) + (v4 - v2)) << st->light; /* light from top */
169 XPutPixel(st->buffer_map,(across<<1), (down<<1), map_color(st, dx + v1));
170 XPutPixel(st->buffer_map,(across<<1)+1,(down<<1), map_color(st, dx + ((v1 + v2) >> 1)));
171 XPutPixel(st->buffer_map,(across<<1), (down<<1)+1,map_color(st, dx + ((v1 + v3) >> 1)));
172 XPutPixel(st->buffer_map,(across<<1)+1,(down<<1)+1,map_color(st, dx + ((v1 + v4) >> 1)));
178 /* ------------------------------------------- */
181 /* Uses the horizontal gradient as an offset to create a warp effect */
183 draw_transparent_vanilla(struct state *st, short *src)
185 int across, down, pixel;
186 char *dirty = st->dirty_buffer;
189 for (down = 0; down < st->height - 2; down++, pixel += 2)
190 for (across = 0; across < st->width-2; across++, pixel++) {
191 int gradx, grady, gradx1, grady1;
192 int x0, x1, x2, y1, y2;
197 y1 = src[pixel + st->width];
198 y2 = src[pixel + 2*st->width];
204 gradx1 = 1 + (gradx + gradx1) / 2;
205 grady1 = 1 + (grady + grady1) / 2;
207 if ((2*across+MIN(gradx,gradx1) < 0) ||
208 (2*across+MAX(gradx,gradx1) >= st->bigwidth)) {
212 if ((2*down+MIN(grady,grady1) < 0) ||
213 (2*down+MAX(grady,grady1) >= st->bigheight)) {
218 if ((gradx == 0 && gradx1 == 1 && grady == 0 && grady1 == 1)) {
219 if (dirty[pixel] > 0)
222 dirty[pixel] = DIRTY;
224 if (dirty[pixel] > 0) {
225 XPutPixel(st->buffer_map, (across<<1), (down<<1),
226 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady)));
227 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1),
228 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady)));
229 XPutPixel(st->buffer_map, (across<<1), (down<<1)+1,
230 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady1)));
231 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1)+1,
232 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady1)));
238 /* ------------------------------------------- */
242 set_mask(unsigned long *mask, int *shift)
244 unsigned long color = *mask;
246 while (color != 0 && (color & 1) == 0) {
255 cadd(unsigned long color, int dx, unsigned long mask, int shift)
262 else if (x > (int)mask) x = mask;
264 return color << shift;
269 bright(struct state *st, int dx, unsigned long color)
271 return (cadd(color, dx, st->rmask, st->rshift) |
272 cadd(color, dx, st->gmask, st->gshift) |
273 cadd(color, dx, st->bmask, st->bshift));
278 grayscale(struct state *st, unsigned long color)
288 if (!st->grayscale_p)
290 if (!st->transparent)
292 if ((st->rmask == 0) || (st->gmask == 0) || (st->bmask == 0))
295 red = ((color >> st->rshift) & st->rmask);
296 green = ((color >> st->gshift) & st->gmask);
297 blue = ((color >> st->bshift) & st->bmask);
298 total = red * st->gmask * st->bmask + green * st->rmask * st->bmask + blue * st->rmask * st->gmask;
300 gray_r = total / (3 * st->gmask * st->bmask);
303 if (gray_r > st->rmask)
306 gray_g = total / (3 * st->rmask * st->bmask);
309 if (gray_g > st->gmask)
312 gray_b = total / (3 * st->rmask * st->gmask);
315 if (gray_b > st->bmask)
318 return ((unsigned long)
319 ((gray_r << st->rshift) | (gray_g << st->gshift) | (gray_b << st->bshift)));
324 draw_transparent_light(struct state *st, short *src)
326 int across, down, pixel;
327 char *dirty = st->dirty_buffer;
330 for (down = 0; down < st->height - 2; down++, pixel += 2)
331 for (across = 0; across < st->width-2; across++, pixel++) {
332 int gradx, grady, gradx1, grady1;
333 int x0, x1, x2, y1, y2;
338 y1 = src[pixel + st->width];
339 y2 = src[pixel + 2*st->width];
345 gradx1 = 1 + (gradx + gradx1) / 2;
346 grady1 = 1 + (grady + grady1) / 2;
348 if ((2*across+MIN(gradx,gradx1) < 0) ||
349 (2*across+MAX(gradx,gradx1) >= st->bigwidth)) {
353 if ((2*down+MIN(grady,grady1) < 0) ||
354 (2*down+MAX(grady,grady1) >= st->bigheight)) {
359 if ((gradx == 0 && gradx1 == 1 && grady == 0 && grady1 == 1)) {
360 if (dirty[pixel] > 0)
363 dirty[pixel] = DIRTY;
365 if (dirty[pixel] > 0) {
369 if (4-st->light >= 0)
370 dx = (grady + (src[pixel+st->width+1]-x1)) >> (4-st->light);
372 dx = (grady + (src[pixel+st->width+1]-x1)) << (st->light-4);
375 XPutPixel(st->buffer_map, (across<<1), (down<<1),
376 bright(st, dx, grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady))));
377 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1),
378 bright(st, dx, grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady))));
379 XPutPixel(st->buffer_map, (across<<1), (down<<1)+1,
380 bright(st, dx, grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady1))));
381 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1)+1,
382 bright(st, dx, grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady1))));
384 /* Could use XCopyArea, but XPutPixel is faster */
385 XPutPixel(st->buffer_map, (across<<1), (down<<1),
386 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady)));
387 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1),
388 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady)));
389 XPutPixel(st->buffer_map, (across<<1), (down<<1)+1,
390 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx, (down<<1) + grady1)));
391 XPutPixel(st->buffer_map, (across<<1)+1,(down<<1)+1,
392 grayscale(st, XGetPixel(st->orig_map, (across<<1) + gradx1,(down<<1) + grady1)));
399 /* ------------------------------------------- */
403 /* Doesn't go any faster and doesn't work at all colour depths */
405 draw_transparent16l(short *src)
407 int across, down, bigpix, pixel;
408 char *dirty = st->dirty_buffer;
409 unsigned short *buffer, *orig;
411 buffer = (unsigned short *) st->buffer_map->data;
412 orig = (unsigned short *) st->orig_map->data;
414 for (pixel = bigpix = down = 0;
415 down < st->height - 2;
416 down++, pixel += 2, bigpix += st->bigwidth+4)
417 for (across = 0; across < st->width-2; across++, pixel++, bigpix+=2) {
418 int gradx, grady, gradx1, grady1;
419 int x0, x1, x2, y1, y2;
424 y1 = src[pixel + st->width];
425 y2 = src[pixel + 2*st->width];
431 gradx1 = 1 + (gradx + gradx1) / 2;
432 grady1 = 1 + (grady + grady1) / 2;
434 if ((2*across+MIN(gradx,gradx1) < 0) ||
435 (2*across+MAX(gradx,gradx1) >= st->bigwidth)) {
439 if ((2*down+MIN(grady,grady1) < 0) ||
440 (2*down+MAX(grady,grady1) >= st->bigheight)) {
445 if ((gradx == 0 && gradx1 == 1 && grady == 0 && grady1 == 1)) {
446 if (dirty[pixel] > 0)
449 dirty[pixel] = DIRTY;
451 if (dirty[pixel] > 0) {
452 unsigned short *dest = buffer + bigpix;
453 unsigned short *image = orig + bigpix;
457 if (4-st->light >= 0)
458 dx = (grady + (src[pixel+st->width+1]-x1)) >> (4-st->light);
460 dx = (grady + (src[pixel+st->width+1]-x1)) << (st->light-4);
462 grady *= st->bigwidth;
463 grady1*= st->bigwidth;
466 *dest++ = dobright(dx, *(image + gradx + grady));
467 *dest = dobright(dx, *(image + gradx1 + grady));
468 dest += st->bigwidth - 1;
469 *dest++ = dobright(dx, *(image + gradx + grady1));
470 *dest = dobright(dx, *(image + gradx1 + grady1));
472 *dest++ = *(image + gradx + grady);
473 *dest = *(image + gradx1 + grady);
474 dest += st->bigwidth - 1;
475 *dest++ = *(image + gradx + grady1);
476 *dest = *(image + gradx1 + grady1);
484 /* ------------------------------------------- */
488 setup_X(struct state *st)
490 XWindowAttributes xgwa;
493 XGetWindowAttributes(st->dpy, st->window, &xgwa);
495 st->colormap = xgwa.colormap;
496 st->screen = xgwa.screen;
497 st->bigwidth = xgwa.width;
498 st->bigheight = xgwa.height;
499 st->visual = xgwa.visual;
502 /* This causes buffer_map to be 1 pixel taller and wider than orig_map,
503 which can cause the two XImages to have different bytes-per-line,
504 which causes stair-stepping. So this better not be necessary...
507 #if 0 /* I'm not entirely sure if I need this */
508 if (st->bigwidth % 2)
510 if (st->bigheight % 2)
515 st->width = st->bigwidth / 2;
516 st->height = st->bigheight / 2;
518 if (st->transparent) {
522 gcv.function = GXcopy;
523 gcv.subwindow_mode = IncludeInferiors;
525 gcflags = GCFunction;
526 if (use_subwindow_mode_p(xgwa.screen, st->window)) /* see grabscreen.c */
527 gcflags |= GCSubwindowMode;
529 st->gc = XCreateGC(st->dpy, st->window, gcflags, &gcv);
531 st->img_loader = load_image_async_simple (0, xgwa.screen, st->window,
533 st->start_time = time ((time_t *) 0);
537 st->gc = XCreateGC(st->dpy, st->window, 0, &gcv);
542 fprintf(stderr, "XCreateGC failed\n");
546 st->buffer_map = create_xshm_image(st->dpy, xgwa.visual, depth,
547 ZPixmap, &st->shm_info, st->bigwidth, st->bigheight);
552 DisplayImage(struct state *st)
554 put_xshm_image(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, 0, 0,
555 st->bigwidth, st->bigheight, &st->shm_info);
559 /* ------------------------------------------- */
563 cinterp(double a, int bg, int fg)
566 result = (int)((1-a) * bg + a * fg + 0.5);
567 if (result < 0) result = 0;
568 if (result > 255) result = 255;
573 /* Interpolate the ripple colours between the background colour and
576 init_linear_colors(struct state *st)
578 int i, j, red, green, blue, bred, bgreen, bblue;
581 if (st->ncolors < 2 || mono_p)
583 if (st->ncolors <= 2)
586 /* Make it possible to set the color of the ripples,
587 Based on work by Raymond Medeiros <ray@stommel.marine.usf.edu> and jwz.
589 fg.pixel = get_pixel_resource(st->dpy, st->colormap, "foreground", "Foreground");
590 XQueryColor(st->dpy, st->colormap, &fg);
592 green = (fg.green >> 8);
593 blue = (fg.blue >> 8);
595 bg.pixel = get_pixel_resource(st->dpy, st->colormap, "background", "Background");
596 XQueryColor(st->dpy, st->colormap, &bg);
597 bred = (bg.red >> 8);
598 bgreen = (bg.green >> 8);
599 bblue = (bg.blue >> 8);
602 for (i = 0; i < st->ncolors+1; i++) {
604 double a = (double)i / st->ncolors;
605 int r = cinterp(a, bred, red);
606 int g = cinterp(a, bgreen, green);
607 int b = cinterp(a, bblue, blue);
609 xcl.red = (unsigned short) ((r << 8) | r);
610 xcl.green = (unsigned short) ((g << 8) | g);
611 xcl.blue = (unsigned short) ((b << 8) | b);
612 xcl.flags = DoRed | DoGreen | DoBlue;
614 XAllocColor(st->dpy, st->colormap, &xcl);
616 st->ctab[j++] = (int) xcl.pixel;
622 init_oily_colors(struct state *st)
624 XColor *colors = NULL;
626 if (st->ncolors < 2 || mono_p)
628 if (st->ncolors <= 2)
633 colors = (XColor *)malloc(sizeof(*colors) * (st->ncolors+1));
634 make_smooth_colormap(st->screen, st->visual, st->colormap,
635 colors, &st->ncolors,
637 False, /* not writable */
638 True); /* verbose (complain about failure) */
639 if (st->ncolors <= 2) {
648 for (i = 0; i < st->ncolors+1; i++) {
649 XAllocColor(st->dpy, st->colormap, colors+i);
650 st->ctab[j++] = (int) colors[i].pixel;
655 st->ctab[1] = get_pixel_resource(st->dpy, st->colormap, "foreground", "Foreground");
656 st->ctab[0] = get_pixel_resource(st->dpy, st->colormap, "background", "Background");
661 /* ------------------------------------------- */
665 init_cos_tab(struct state *st)
668 for (i = 0; i < TABLE; i++)
669 st->cos_tab[i] = cos(i * M_PI/2 / TABLE);
673 /* Shape of drop to add */
675 sinc(struct state *st, double x)
680 i = (int)(x * TABLE + 0.5);
681 if (i >= TABLE) i = (TABLE-1) - (i-(TABLE-1));
682 if (i < 0) return 0.;
683 return st->cos_tab[i];
685 return cos(x * M_PI/2);
696 add_circle_drop(struct state *st, int x, int y, int radius, int dheight)
699 short *buf = (random()&1) ? st->bufferA : st->bufferB;
701 r2 = radius * radius;
704 for (cy = -radius; cy <= radius; cy++)
705 for (cx = -radius; cx <= radius; cx++) {
708 if (xx < 0 || yy < 0 || xx >= st->width || yy >= st->height) {break;}
711 buf[xx + yy*st->width] =
712 (short)(dheight * sinc(st, (radius > 0) ? sqrt(r)/radius : 0));
718 add_drop(struct state *st, ripple_mode mode, int drop)
720 int newx, newy, dheight;
721 int radius = MIN(st->width, st->height) / 50;
722 /* Don't put drops too near the edge of the screen or they get stuck */
730 dheight = 1 + (random() % drop);
731 newx = border + (random() % (st->width - 2*border));
732 newy = border + (random() % (st->height - 2*border));
733 x = newy * st->width + newx;
734 st->bufferA[x + 1] = st->bufferA[x] = st->bufferA[x + st->width] = st->bufferA[x + st->width + 1] =
735 st->bufferB[x + 1] = st->bufferB[x] = st->bufferB[x + st->width] = st->bufferB[x + st->width + 1] =
743 power = drop_dist[random() % (sizeof(drop_dist)/sizeof(drop_dist[0]))]; /* clumsy */
744 dheight = (int)(drop * (power + 0.01));
745 tmp_i = (int)(st->width - 2*border - 2*radius*power);
746 tmp_j = (int)(st->height - 2*border - 2*radius*power);
747 newx = radius + border + ((tmp_i > 0) ? random() % tmp_i : 0);
748 newy = radius + border + ((tmp_j > 0) ? random() % tmp_j : 0);
749 add_circle_drop(st, newx, newy, radius, dheight);
752 /* Adding too many boxes too quickly (-box 1) doesn't give the waves time
753 to disperse and the waves build up (and overflow) */
757 short *buf = (random()&1) ? st->bufferA : st->bufferB;
760 radius = (1 + (random() % 5)) * (1 + (random() % 5));
761 dheight = drop / 128;
762 if (random() & 1) dheight = -dheight;
763 tmp_i = st->width - 2*border - 2*radius;
764 tmp_j = st->height - 2*border - 2*radius;
765 newx = radius + border + ((tmp_i > 0) ? random() % tmp_i : 0);
766 newy = radius + border + ((tmp_j > 0) ? random() % tmp_j : 0);
767 x = newy * st->width + newx;
768 for (cy = -radius; cy <= radius; cy++)
769 for (cx = -radius; cx <= radius; cx++)
770 buf[x + cx + cy*st->width] = (short)(dheight);
775 newx = border + (int)((st->width-2*border) * (1+cos(3*st->stir_ang)) / 2);
776 newy = border + (int)((st->height-2*border) * (1+sin(2*st->stir_ang)) / 2);
777 add_circle_drop(st, newx, newy, radius, drop / 10);
778 st->stir_ang += 0.02;
779 if (st->stir_ang > 12*M_PI) st->stir_ang = 0;
787 init_ripples(struct state *st, int ndrops, int splash)
791 st->bufferA = (short *)calloc(st->width * st->height, sizeof(*st->bufferA));
792 st->bufferB = (short *)calloc(st->width * st->height, sizeof(*st->bufferB));
793 st->temp = (short *)calloc(st->width * st->height, sizeof(*st->temp));
795 st->dirty_buffer = (char *)calloc(st->width * st->height, sizeof(*st->dirty_buffer));
797 for (i = 0; i < ndrops; i++)
798 add_drop(st, ripple_blob, splash);
800 if (st->transparent) {
804 for (down = 0; down < st->bigheight; down++)
805 for (across = 0; across < st->bigwidth; across++)
806 XPutPixel(st->buffer_map, across, down,
807 grayscale(st, XGetPixel(st->orig_map, across, down)));
811 /* There's got to be a better way of doing this XCopyArea? */
812 memcpy(st->buffer_map->data, st->orig_map->data,
813 st->bigheight * st->buffer_map->bytes_per_line);
816 int across, down, color;
818 color = map_color(st, 0); /* background colour */
819 for (down = 0; down < st->bigheight; down++)
820 for (across = 0; across < st->bigwidth; across++)
821 XPutPixel(st->buffer_map,across, down, color);
829 Explanation from hq_water.zip (Arturo R Montesinos (ARM) arami@fi.upm.es)
831 Differential equation is: u = a ( u + u )
834 Where a = tension * gravity / surface_density.
836 Approximating second derivatives by central differences:
838 [ u(t+1)-2u(t)+u(t-1) ] / dt = a [ u(x+1)+u(x-1)+u(y+1)+u(y-1)-4u ] / h
840 where dt = time step squared, h = dx*dy = mesh resolution squared.
842 From where u(t+1) may be calculated as:
845 u(t+1) = a -- | 1 0 1 |u - u(t-1) + (2-4a --)u
848 When a*dt/h = 1/2 last term vanishes, giving:
851 u(t+1) = - | 1 0 1 |u - u(t-1)
854 (note that u(t-1,x,y) is only used to calculate u(t+1,x,y) so
855 we can use the same array for both t-1 and t+1, needing only
856 two arrays, U[0] and U[1])
858 Dampening is simulated by subtracting 1/2^n of result.
859 n=4 gives best-looking result
860 n<4 (eg 2 or 3) thicker consistency, waves die out immediately
861 n>4 (eg 8 or 12) more fluid, waves die out slowly
865 ripple(struct state *st)
867 int across, down, pixel;
870 if (st->draw_toggle == 0) {
880 switch (st->draw_count) {
882 pixel = 1 * st->width + 1;
883 for (down = 1; down < st->height - 1; down++, pixel += 2 * 1)
884 for (across = 1; across < st->width - 1; across++, pixel++) {
886 (((src[pixel - 1] + src[pixel + 1] +
887 src[pixel - st->width] + src[pixel + st->width]) / 2)) - dest[pixel];
890 /* Smooth the output */
891 pixel = 1 * st->width + 1;
892 for (down = 1; down < st->height - 1; down++, pixel += 2 * 1)
893 for (across = 1; across < st->width - 1; across++, pixel++) {
894 if (st->temp[pixel] != 0) { /* Close enough for government work */
896 (st->temp[pixel - 1] + st->temp[pixel + 1] +
897 st->temp[pixel - st->width] + st->temp[pixel + st->width] +
898 st->temp[pixel - st->width - 1] + st->temp[pixel - st->width + 1] +
899 st->temp[pixel + st->width - 1] + st->temp[pixel + st->width + 1] +
900 st->temp[pixel]) / 9;
901 dest[pixel] = damp - (damp >> st->fluidity);
907 pixel = 1 * st->width + 1;
908 for (down = 1; down < st->height - 1; down++, pixel += 2 * 1)
909 for (across = 1; across < st->width - 1; across++, pixel++) {
911 (((src[pixel - 1] + src[pixel + 1] +
912 src[pixel - st->width] + src[pixel + st->width]) / 2)) - dest[pixel];
913 dest[pixel] = damp - (damp >> st->fluidity);
917 if (++st->draw_count > 3) st->draw_count = 0;
920 st->draw_transparent(st, dest);
922 draw_ripple(st, dest);
926 /* ------------------------------------------- */
929 ripples_init (Display *disp, Window win)
931 struct state *st = (struct state *) calloc (1, sizeof(*st));
935 st->delay = get_integer_resource(disp, "delay", "Integer");
936 st->duration = get_integer_resource (st->dpy, "duration", "Seconds");
937 st->rate = get_integer_resource(disp, "rate", "Integer");
938 st->box = get_integer_resource(disp, "box", "Integer");
939 st->oily = get_boolean_resource(disp, "oily", "Boolean");
940 st->stir = get_boolean_resource(disp, "stir", "Boolean");
941 st->fluidity = get_integer_resource(disp, "fluidity", "Integer");
942 st->transparent = get_boolean_resource(disp, "water", "Boolean");
943 st->grayscale_p = get_boolean_resource(disp, "grayscale", "Boolean");
944 st->light = get_integer_resource(disp, "light", "Integer");
946 if (st->delay < 0) st->delay = 0;
947 if (st->duration < 1) st->duration = 1;
948 if (st->fluidity <= 1) st->fluidity = 1;
949 if (st->fluidity > 16) st->fluidity = 16; /* 16 = sizeof(short) */
950 if (st->light < 0) st->light = 0;
955 st->ncolors = get_integer_resource (disp, "colors", "Colors");
956 if (0 == st->ncolors) /* English spelling? */
957 st->ncolors = get_integer_resource (disp, "colours", "Colors");
959 if (st->ncolors > sizeof(st->ctab)/sizeof(*st->ctab))
960 st->ncolors = sizeof(st->ctab)/sizeof(*st->ctab);
963 init_oily_colors(st);
965 init_linear_colors(st);
967 if (st->transparent && st->light > 0) {
969 st->draw_transparent = draw_transparent_light;
970 visual_rgb_masks (st->screen, st->visual,
971 &st->rmask, &st->gmask, &st->bmask);
972 set_mask(&st->rmask, &st->rshift);
973 set_mask(&st->gmask, &st->gshift);
974 set_mask(&st->bmask, &st->bshift);
975 if (st->rmask == 0) st->draw_transparent = draw_transparent_vanilla;
977 /* Adjust the shift value "light" when we don't have 8 bits per colour */
978 maxbits = MIN(MIN(BITCOUNT(st->rmask), BITCOUNT(st->gmask)), BITCOUNT(st->bmask));
979 st->light -= 8-maxbits;
980 if (st->light < 0) st->light = 0;
984 visual_rgb_masks (st->screen, st->visual,
985 &st->rmask, &st->gmask, &st->bmask);
986 set_mask(&st->rmask, &st->rshift);
987 set_mask(&st->gmask, &st->gshift);
988 set_mask(&st->bmask, &st->bshift);
990 st->draw_transparent = draw_transparent_vanilla;
993 if (!st->transparent)
994 init_ripples(st, 0, -SPLASH); /* Start off without any drops */
1000 ripples_draw (Display *dpy, Window window, void *closure)
1002 struct state *st = (struct state *) closure;
1004 if (st->img_loader) /* still loading */
1006 st->img_loader = load_image_async_simple (st->img_loader, 0, 0, 0, 0, 0);
1007 if (! st->img_loader) { /* just finished */
1008 XWindowAttributes xgwa;
1009 XGetWindowAttributes(st->dpy, st->window, &xgwa);
1010 st->start_time = time ((time_t *) 0);
1011 st->orig_map = XGetImage (st->dpy, st->window, 0, 0,
1012 xgwa.width, xgwa.height,
1014 init_ripples(st, 0, -SPLASH); /* Start off without any drops */
1019 if (!st->img_loader &&
1020 st->start_time + st->duration < time ((time_t *) 0)) {
1021 XWindowAttributes xgwa;
1022 XGetWindowAttributes(st->dpy, st->window, &xgwa);
1023 st->img_loader = load_image_async_simple (0, xgwa.screen, st->window,
1025 st->start_time = time ((time_t *) 0);
1029 if (st->rate > 0 && (st->iterations % st->rate) == 0)
1030 add_drop(st, ripple_blob, -SPLASH);
1032 add_drop(st, ripple_stir, -SPLASH);
1033 if (st->box > 0 && (random() % st->box) == 0)
1034 add_drop(st, ripple_box, -SPLASH);
1046 ripples_reshape (Display *dpy, Window window, void *closure,
1047 unsigned int w, unsigned int h)
1052 ripples_event (Display *dpy, Window window, void *closure, XEvent *event)
1054 struct state *st = (struct state *) closure;
1055 if (screenhack_event_helper (dpy, window, event))
1064 ripples_free (Display *dpy, Window window, void *closure)
1066 struct state *st = (struct state *) closure;
1070 static const char *ripples_defaults[] =
1072 ".background: black",
1073 ".foreground: #FFAF5F",
1075 "*dontClearRoot: True",
1085 "*grayscale: False",
1086 #ifdef HAVE_XSHM_EXTENSION
1092 "*ignoreRotation: True",
1093 "*rotateImages: True",
1098 static XrmOptionDescRec ripples_options[] =
1100 { "-colors", ".colors", XrmoptionSepArg, 0},
1101 { "-colours", ".colors", XrmoptionSepArg, 0},
1102 {"-delay", ".delay", XrmoptionSepArg, 0},
1103 {"-duration", ".duration", XrmoptionSepArg, 0 },
1104 {"-rate", ".rate", XrmoptionSepArg, 0},
1105 {"-box", ".box", XrmoptionSepArg, 0},
1106 {"-water", ".water", XrmoptionNoArg, "True"},
1107 {"-oily", ".oily", XrmoptionNoArg, "True"},
1108 {"-stir", ".stir", XrmoptionNoArg, "True"},
1109 {"-fluidity", ".fluidity", XrmoptionSepArg, 0},
1110 {"-light", ".light", XrmoptionSepArg, 0},
1111 {"-grayscale", ".grayscale", XrmoptionNoArg, "True"},
1112 {"-shm", ".useSHM", XrmoptionNoArg, "True"},
1113 {"-no-shm", ".useSHM", XrmoptionNoArg, "False"},
1118 XSCREENSAVER_MODULE ("Ripples", ripples)