Re: Accuracy of motion events
- From: Stefan Salewski <mail ssalewski de>
- To: ax487 <ax487 gmx de>
- Cc: gtk-list <gtk-list gnome org>
- Subject: Re: Accuracy of motion events
- Date: Tue, 02 Sep 2014 02:15:54 +0200
On Mon, 2014-09-01 at 23:29 +0200, ax487 wrote:
Just as an illustration: http://picpaste.com/event-DmCNqCHZ.png
It does make a difference :)
Yes -- so my assumption was that you get events with better time
resolution than 10 ms without compression.
So I hacked together a small test in plain C.
But again, I can not see a difference for my Box.
(Linux AMD64, Gtk3.12, Gnome3, X11, AMDX2 CPU, nvidia-drivers ...)
Here is the C code and the output, event time delta is general 12 ms
with few exceptions, no matter if compression is enabled or disabled.
/* http://zetcode.com/tutorials/gtktutorial/firstprograms/ */
#include <gtk/gtk.h>
void print_event(GtkWidget *widget, GdkEventMotion *event, gpointer p)
{
printf("%.0f, %.0f: %d\n", event->x, event->y, event->time);
}
int main( int argc, char *argv[])
{
GtkWidget *window;
GdkWindow *gdkwin;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 800, 800);
gtk_widget_set_events(window, GDK_POINTER_MOTION_MASK);
gtk_widget_show(window);
g_signal_connect(window, "motion_notify_event",
G_CALLBACK (print_event), NULL);
g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
gdkwin = gtk_widget_get_window(window);
// gdk_window_set_event_compression(gdkwin, FALSE);
gdk_window_set_event_compression(gdkwin, TRUE);
gtk_main();
return 0;
}
36, 422: 42037389
36, 426: 42037401
48, 438: 42037413
62, 451: 42037432
79, 464: 42037437
102, 475: 42037455
129, 486: 42037465
150, 493: 42037477
179, 500: 42037489
206, 502: 42037501
233, 502: 42037513
262, 502: 42037525
285, 491: 42037537
314, 480: 42037549
343, 469: 42037566
372, 460: 42037577
391, 447: 42037589
406, 430: 42037601
421, 413: 42037613
436, 396: 42037631
447, 377: 42037637
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