Attachment 122303 Details for Bug 94548 – demo which demonstrates slowness of XGetWindowAttributes on El Capitan

demo which demonstrates slowness of XGetWindowAttributes on El Capitan

rectangles.c (text/plain), 1.54 KB, created by Dušan Peterc on 2016-03-15 00:13:34 UTC

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Creator: Dušan Peterc

Created: 2016-03-15 00:13:34 UTC

Size: 1.54 KB

patch

obsolete

>/* compile on Mac OS X: gcc rectangles.c  -I/usr/X11/include -L/usr/X11R6/lib -lX11 -o rectangles */
>/* compile on Linux:  gcc rectangles.c -L/usr/X11R6/lib -lX11 -o rectangles */
>/* benchmark drawing of single rectangles and query window attributes. */
>/* XQuartz on Mac OS X El Capitan is very slow due to some bug in implementation of XGetWindowAttributes */
>/* same code runs 700 times faster on MacOS X Snow Leopard or on Linux, any version */
>/* timing resuls for "time rectangles" */
>/* Linux 4K, Suse 42.1; i7: 0.5 seconds */
>/* iMac 27, OS X 10.0.6; i5: 1.5 seconds */
>/* iMac 27 retina, OS X 10.11, i5: 10 minutes 58 seconds */
>
>#include <X11/Xlib.h>
>#include <stdio.h>
>#include <stdlib.h>
>
>#define RECT_SIZE	5
>#define WINDOW_SIZE	1000
>
>int main(void) {
> Display *d;
> Window w;
> XEvent e;
> int s;
>
> d = XOpenDisplay(NULL);
> if (d)
>  {
>   s = DefaultScreen(d);
>   w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, WINDOW_SIZE, WINDOW_SIZE, 1, BlackPixel(d, s), WhitePixel(d, s));
>   XSelectInput(d, w, ExposureMask | KeyPressMask);
>   XMapWindow(d, w);
>
>   XNextEvent(d, &e);
>   if (e.type == Expose)
>    {
>     XWindowAttributes state;
>     int x, y;
>
>     XGetWindowAttributes(d, w, &state);
>     for (y=0; y<state.height; y+=RECT_SIZE)
>      for (x=0; x<state.width; x+=RECT_SIZE)
>       {
>	XGetWindowAttributes(d, w, &state); /* ultra slow on El Capitan */
>	XSetForeground(d, DefaultGC(d, s), random());
>        XFillRectangle(d, w, DefaultGC(d, s), x, y, RECT_SIZE-1, RECT_SIZE-1);
>       }
>    }
> }
> XDestroyWindow(d, w);
> XCloseDisplay(d);
> return(0);
>}

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