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/*
* gstvaapiutils_x11.c - X11 utilties
*
* Copyright (C) 2010-2011 Splitted-Desktop Systems
* Author: Gwenole Beauchesne <gwenole.beauchesne@splitted-desktop.com>
* Copyright (C) 2011-2013 Intel Corporation
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include "sysdeps.h"
#include <glib.h>
#include <X11/Xutil.h>
#include "gstvaapiutils_x11.h"
// X error trap
static int x11_error_code = 0;
static int (*old_error_handler) (Display *, XErrorEvent *);
static int
error_handler (Display * dpy, XErrorEvent * error)
{
x11_error_code = error->error_code;
return 0;
}
void
x11_trap_errors (void)
{
x11_error_code = 0;
old_error_handler = XSetErrorHandler (error_handler);
}
int
x11_untrap_errors (void)
{
XSetErrorHandler (old_error_handler);
return x11_error_code;
}
// X window management
static const int x11_event_mask = (KeyPressMask | KeyReleaseMask
| ButtonPressMask | ButtonReleaseMask | PointerMotionMask
| EnterWindowMask | ExposureMask | StructureNotifyMask);
/**
* x11_create_window:
* @dpy: an X11 #Display
* @w: the requested width, in pixels
* @h: the requested height, in pixels
* @vid: the requested visual id
* @cmap: the requested colormap
*
* Creates a border-less window with the specified dimensions. If @vid
* is zero, the default visual for @display will be used. If @cmap is
* %None, no specific colormap will be bound to the window. Also note
* the default background color is black.
*
* Return value: the newly created X #Window.
*/
Window
x11_create_window (Display * dpy, guint w, guint h, guint vid, Colormap cmap)
{
Window rootwin, win;
int screen, depth;
XSetWindowAttributes xswa;
unsigned long xswa_mask;
XWindowAttributes wattr;
unsigned long black_pixel;
XVisualInfo visualInfo, *vi;
int num_visuals;
screen = DefaultScreen (dpy);
rootwin = RootWindow (dpy, screen);
black_pixel = BlackPixel (dpy, screen);
XGetWindowAttributes (dpy, rootwin, &wattr);
depth = wattr.depth;
if (depth != 15 && depth != 16 && depth != 24 && depth != 32)
depth = 24;
xswa_mask = CWBorderPixel | CWBackPixel;
xswa.border_pixel = black_pixel;
xswa.background_pixel = black_pixel;
if (cmap) {
xswa_mask |= CWColormap;
xswa.colormap = cmap;
}
if (vid) {
visualInfo.visualid = vid;
vi = XGetVisualInfo (dpy, VisualIDMask, &visualInfo, &num_visuals);
if (!vi || num_visuals < 1)
goto error_create_visual;
} else {
vi = &visualInfo;
XMatchVisualInfo (dpy, screen, depth, TrueColor, vi);
}
win = XCreateWindow (dpy, rootwin, 0, 0, w, h, 0, depth, InputOutput,
vi->visual, xswa_mask, &xswa);
if (vi != &visualInfo)
XFree (vi);
if (!win)
goto error_create_window;
XSelectInput (dpy, win, x11_event_mask);
return win;
/* ERRORS */
error_create_visual:
GST_ERROR ("failed to create X visual (id:%zu)", (gsize) visualInfo.visualid);
if (vi)
XFree (vi);
return None;
error_create_window:
GST_ERROR ("failed to create X window of size %ux%u", w, h);
return None;
}
gboolean
x11_get_geometry (Display * dpy, Drawable drawable, gint * px, gint * py,
guint * pwidth, guint * pheight, guint * pdepth)
{
Window rootwin;
int x, y;
guint width, height, border_width, depth;
x11_trap_errors ();
XGetGeometry (dpy, drawable, &rootwin, &x, &y, &width, &height,
&border_width, &depth);
if (x11_untrap_errors ())
return FALSE;
if (px)
*px = x;
if (py)
*py = y;
if (pwidth)
*pwidth = width;
if (pheight)
*pheight = height;
if (pdepth)
*pdepth = depth;
return TRUE;
}
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