#include "screenhack.h"
#include <stdio.h>
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+#include "xdbe.h"
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
typedef struct {
Display *dpy;
Window window;
XWindowAttributes xgwa;
+ Pixmap b, ba; /* double-buffer to reduce flicker */
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+ XdbeBackBuffer backb;
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
+
GC draw_gc; /* most of the balls */
GC draw_gc2; /* the ball being dragged with the mouse */
GC erase_gc;
Bool random_sizes_p; /* Whether balls should be various sizes up to max. */
Bool shake_p; /* Whether to mess with gravity when things settle. */
+ Bool dbuf; /* Whether we're using double buffering. */
+ Bool dbeclear_p; /* ? */
float shake_threshold;
int time_since_shake;
int font_baseline;
int frame_count;
int collision_count;
-
+ char fps_str[1024];
+
} b_state;
+/* Draws the frames per second string */
+static void
+draw_fps_string (b_state *state)
+{
+ XFillRectangle (state->dpy, state->b, state->erase_gc,
+ 0, state->xgwa.height - state->font_height,
+ state->xgwa.width, state->font_height);
+ XDrawImageString (state->dpy, state->b, state->font_gc,
+ 0, state->xgwa.height - state->font_baseline,
+ state->fps_str, strlen(state->fps_str));
+}
/* Finds the origin of the window relative to the root window, by
walking up the window tree until it reaches the top.
check_window_moved (b_state *state)
{
float oxmin = state->xmin;
+ float oxmax = state->xmax;
float oymin = state->ymin;
float oymax = state->ymax;
int wx, wy;
state->xmax = state->xmin + state->xgwa.width;
state->ymax = state->ymin + state->xgwa.height - state->font_height;
- /* Only need to erase the window if the origin moved */
- if (oxmin != state->xmin || oymin != state->ymin)
- XClearWindow (state->dpy, state->window);
- else if (state->fps_p && oymax != state->ymax)
- XFillRectangle (state->dpy, state->window, state->erase_gc,
- 0, state->xgwa.height - state->font_height,
- state->xgwa.width, state->font_height);
-
+ if (state->dbuf && (state->ba))
+ {
+ if (oxmax != state->xmax || oymax != state->ymax)
+ {
+ XFreePixmap (state->dpy, state->ba);
+ state->ba = XCreatePixmap (state->dpy, state->window,
+ state->xgwa.width, state->xgwa.height,
+ state->xgwa.depth);
+ XFillRectangle (state->dpy, state->ba, state->erase_gc, 0, 0,
+ state->xgwa.width, state->xgwa.height);
+ state->b = state->ba;
+ }
+ }
+ else
+ {
+ /* Only need to erase the window if the origin moved */
+ if (oxmin != state->xmin || oymin != state->ymin)
+ XClearWindow (state->dpy, state->window);
+ else if (state->fps_p && oymax != state->ymax)
+ XFillRectangle (state->dpy, state->b, state->erase_gc,
+ 0, state->xgwa.height - state->font_height,
+ state->xgwa.width, state->font_height);
+ }
}
XSetForeground (state->dpy, state->draw_gc2, state->fg2.pixel);
}
-
/* Initialize the state structure and various X data.
*/
static b_state *
XGCValues gcv;
state->dpy = dpy;
+
state->window = window;
check_window_moved (state);
+ state->dbuf = get_boolean_resource ("doubleBuffer", "Boolean");
+ state->dbeclear_p = get_boolean_resource ("useDBEClear", "Boolean");
+
+ if (state->dbuf)
+ {
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+ if (state->dbeclear_p)
+ state->b = xdbe_get_backbuffer (dpy, window, XdbeBackground);
+ else
+ state->b = xdbe_get_backbuffer (dpy, window, XdbeUndefined);
+ state->backb = state->b;
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
+
+ if (!state->b)
+ {
+ state->ba = XCreatePixmap (state->dpy, state->window,
+ state->xgwa.width, state->xgwa.height,
+ state->xgwa.depth);
+ state->b = state->ba;
+ }
+ }
+ else
+ {
+ state->b = state->window;
+ }
+
/* Select ButtonRelease events on the external window, if no other app has
already selected it (only one app can select it at a time: BadAccess. */
if (! (state->xgwa.all_event_masks & ButtonReleaseMask))
state->dpy, state->xgwa.colormap);
gcv.background = get_pixel_resource("background", "Background",
state->dpy, state->xgwa.colormap);
- state->draw_gc = XCreateGC (state->dpy, state->window,
+ state->draw_gc = XCreateGC (state->dpy, state->b,
GCForeground|GCBackground, &gcv);
gcv.foreground = get_pixel_resource("mouseForeground", "MouseForeground",
state->dpy, state->xgwa.colormap);
- state->draw_gc2 = XCreateGC (state->dpy, state->window,
+ state->draw_gc2 = XCreateGC (state->dpy, state->b,
GCForeground|GCBackground, &gcv);
gcv.foreground = gcv.background;
- state->erase_gc = XCreateGC (state->dpy, state->window,
+ state->erase_gc = XCreateGC (state->dpy, state->b,
GCForeground|GCBackground, &gcv);
+
+ if (state->ba)
+ XFillRectangle (state->dpy, state->ba, state->erase_gc, 0, 0,
+ state->xgwa.width, state->xgwa.height);
+
recolor (state);
extx = state->xmax - state->xmin;
gcv.font = font->fid;
gcv.foreground = get_pixel_resource("textColor", "Foreground",
state->dpy, state->xgwa.colormap);
- state->font_gc = XCreateGC(dpy, window,
+ state->font_gc = XCreateGC(dpy, state->b,
GCFont|GCForeground|GCBackground, &gcv);
state->font_height = font->ascent + font->descent;
state->font_baseline = font->descent;
{
static int tick = 0;
state->frame_count++;
-
+
if (tick++ > 20) /* don't call gettimeofday() too often -- it's slow. */
{
- static struct timeval last = { 0, };
struct timeval now;
+ static struct timeval last = {0, };
# ifdef GETTIMEOFDAY_TWO_ARGS
struct timezone tzp;
gettimeofday(&now, &tzp);
state->time_since_shake += (now.tv_sec - last.tv_sec);
- if (state->fps_p)
- {
- static char buf[1024];
- float elapsed = ((now.tv_sec + (now.tv_usec / 1000000.0)) -
- (last.tv_sec + (last.tv_usec / 1000000.0)));
- float fps = state->frame_count / elapsed;
- float cps = state->collision_count / elapsed;
-
- sprintf (buf, " FPS: %.2f Collisions: %.f/frame Max motion: %.3f",
- fps, cps/fps, max_d);
-
- XFillRectangle (state->dpy, state->window, state->erase_gc,
- 0, state->xgwa.height - state->font_height,
- state->xgwa.width, state->font_height);
- XDrawImageString (state->dpy, state->window, state->font_gc,
- 0, state->xgwa.height - state->font_baseline,
- buf, strlen(buf));
- }
+ if (state->fps_p)
+ {
+ float elapsed = ((now.tv_sec + (now.tv_usec / 1000000.0)) -
+ (last.tv_sec + (last.tv_usec / 1000000.0)));
+ float fps = state->frame_count / elapsed;
+ float cps = state->collision_count / elapsed;
+
+ sprintf (state->fps_str,
+ " FPS: %.2f Collisions: %.3f/frame Max motion: %.3f",
+ fps, cps/fps, max_d);
+
+ draw_fps_string(state);
+ }
state->frame_count = 0;
state->collision_count = 0;
}
}
-
/* Erases the balls at their previous positions, and draws the new ones.
*/
static void
x2b = (state->px[a] + state->r[a] - state->xmin);
y2b = (state->py[a] + state->r[a] - state->ymin);
-/* if (x1a != x1b || y1a != y1b) -- leaves turds if we optimize this */
- {
- gc = state->erase_gc;
- XFillArc (state->dpy, state->window, gc,
- x1a, y1a, x2a-x1a, y2a-y1a,
- 0, 360*64);
- }
-
+ if (!state->dbeclear_p ||
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+ !state->backb
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
+ )
+ {
+/* if (x1a != x1b || y1a != y1b) -- leaves turds if we optimize this */
+ {
+ gc = state->erase_gc;
+ XFillArc (state->dpy, state->b, gc,
+ x1a, y1a, x2a-x1a, y2a-y1a,
+ 0, 360*64);
+ }
+ }
if (state->mouse_ball == a)
gc = state->draw_gc2;
else
gc = state->draw_gc;
- XFillArc (state->dpy, state->window, gc,
+ XFillArc (state->dpy, state->b, gc,
x1b, y1b, x2b-x1b, y2b-y1b,
0, 360*64);
state->opy[a] = state->py[a];
}
+ if (state->fps_p && state->dbeclear_p)
+ draw_fps_string(state);
+
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+ if (state->backb)
+ {
+ XdbeSwapInfo info[1];
+ info[0].swap_window = state->window;
+ info[0].swap_action = (state->dbeclear_p ? XdbeBackground : XdbeUndefined);
+ XdbeSwapBuffers (state->dpy, info, 1);
+ }
+ else
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
+ if (state->dbuf)
+ {
+ XCopyArea (state->dpy, state->b, state->window, state->erase_gc,
+ 0, 0, state->xgwa.width, state->xgwa.height, 0, 0);
+ }
+
if (state->shake_p && state->time_since_shake > 5)
{
max_d /= state->max_radius;
"*doFPS: False",
"*shake: True",
"*shakeThreshold: 0.015",
+ "*doubleBuffer: True",
+#ifdef HAVE_DOUBLE_BUFFER_EXTENSION
+ "*useDBE: True",
+ "*useDBEClear: True",
+#endif /* HAVE_DOUBLE_BUFFER_EXTENSION */
0
};
{ "-no-shake", ".shake", XrmoptionNoArg, "False" },
{ "-random", ".random", XrmoptionNoArg, "True" },
{ "-nonrandom", ".random", XrmoptionNoArg, "False" },
+ { "-db", ".doubleBuffer", XrmoptionNoArg, "True" },
+ { "-no-db", ".doubleBuffer", XrmoptionNoArg, "False" },
{ 0, 0, 0, 0 }
};
projects / xscreensaver / blobdiff