trunk/rdesktop/ewmhints.c

/*
   rdesktop: A Remote Desktop Protocol client.

   Support functions for Extended Window Manager Hints,
   http://www.freedesktop.org/standards/wm-spec.html

   Copyright (C) Matthew Chapman 1999-2002
   Copyright (C) Peter Astrand <peter@cendio.se> 2003
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <X11/Xlib.h>
#include "rdesktop.h"

extern Display *g_display;

/* 
   Get window property value (32 bit format) 
   Returns zero on success, -1 on error
*/
static int
get_property_value(char *propname, long max_length,
                   unsigned long *nitems_return, unsigned char **prop_return)
{
        int result;
        Atom property;
        Atom actual_type_return;
        int actual_format_return;
        unsigned long bytes_after_return;

        property = XInternAtom(g_display, propname, True);
        if (property == None)
        {
                fprintf(stderr, "Atom %s does not exist\n", propname);
                return (-1);
        }

        result = XGetWindowProperty(g_display, DefaultRootWindow(g_display), property, 0,       /* long_offset */
                                    max_length, /* long_length */
                                    False,      /* delete */
                                    AnyPropertyType,    /* req_type */
                                    &actual_type_return,
                                    &actual_format_return,
                                    nitems_return, &bytes_after_return, prop_return);

        if (result != Success)
        {
                fprintf(stderr, "XGetWindowProperty failed\n");
                return (-1);
        }

        if (actual_type_return == None || actual_format_return == 0)
        {
                fprintf(stderr, "Root window is missing property %s\n", propname);
                return (-1);
        }

        if (bytes_after_return)
        {
                fprintf(stderr, "%s is too big for me\n", propname);
                return (-1);
        }

        if (actual_format_return != 32)
        {
                fprintf(stderr, "%s has bad format\n", propname);
                return (-1);
        }

        return (0);
}

/* 
   Get current desktop number
   Returns -1 on error
*/
static int
get_current_desktop(void)
{
        unsigned long nitems_return;
        unsigned char *prop_return;
        int current_desktop;

        if (get_property_value("_NET_CURRENT_DESKTOP", 1, &nitems_return,
                               &prop_return) < 0)
                return (-1);

        if (nitems_return != 1)
        {
                fprintf(stderr, "_NET_CURRENT_DESKTOP has bad length\n");
                return (-1);
        }

        current_desktop = *prop_return;
        XFree(prop_return);
        return current_desktop;
}

/*
  Get workarea geometry
  Returns zero on success, -1 on error
 */

int
get_current_workarea(uint32 * x, uint32 * y, uint32 * width, uint32 * height)
{
        int current_desktop;
        unsigned long nitems_return;
        unsigned char *prop_return;
        uint32 *return_words;
        const uint32 net_workarea_x_offset = 0;
        const uint32 net_workarea_y_offset = 1;
        const uint32 net_workarea_width_offset = 2;
        const uint32 net_workarea_height_offset = 3;
        const uint32 max_prop_length = 32 * 4;  /* Max 32 desktops */

        if (get_property_value("_NET_WORKAREA", max_prop_length, &nitems_return,
                               &prop_return) < 0)
                return (-1);

        if (nitems_return % 4)
        {
                fprintf(stderr, "_NET_WORKAREA has odd length\n");
                return (-1);
        }

        current_desktop = get_current_desktop();

        if (current_desktop < 0)
                return -1;

        return_words = (uint32 *)prop_return;

        *x = return_words[current_desktop * 4 + net_workarea_x_offset];
        *y = return_words[current_desktop * 4 + net_workarea_y_offset];
        *width = return_words[current_desktop * 4 + net_workarea_width_offset];
        *height = return_words[current_desktop * 4 + net_workarea_height_offset];

        XFree(prop_return);

        return (0);

}
1	astrand	263	/*
2			rdesktop: A Remote Desktop Protocol client.
3
4			Support functions for Extended Window Manager Hints,
5			http://www.freedesktop.org/standards/wm-spec.html
6
7			Copyright (C) Matthew Chapman 1999-2002
8	astrand	466	Copyright (C) Peter Astrand <peter@cendio.se> 2003
9	astrand	263
10			This program is free software; you can redistribute it and/or modify
11			it under the terms of the GNU General Public License as published by
12			the Free Software Foundation; either version 2 of the License, or
13			(at your option) any later version.
14
15			This program is distributed in the hope that it will be useful,
16			but WITHOUT ANY WARRANTY; without even the implied warranty of
17			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18			GNU General Public License for more details.
19
20			You should have received a copy of the GNU General Public License
21			along with this program; if not, write to the Free Software
22			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23			*/
24
25	astrand	266	#include <X11/Xlib.h>
26	astrand	263	#include "rdesktop.h"
27
28	jsorg71	450	extern Display *g_display;
29	astrand	263
30			/*
31			Get window property value (32 bit format)
32			Returns zero on success, -1 on error
33			*/
34			static int
35			get_property_value(char *propname, long max_length,
36			unsigned long nitems_return, unsigned char *prop_return)
37			{
38			int result;
39			Atom property;
40			Atom actual_type_return;
41			int actual_format_return;
42			unsigned long bytes_after_return;
43
44	jsorg71	450	property = XInternAtom(g_display, propname, True);
45	astrand	263	if (property == None)
46			{
47			fprintf(stderr, "Atom %s does not exist\n", propname);
48			return (-1);
49			}
50
51	jsorg71	450	result = XGetWindowProperty(g_display, DefaultRootWindow(g_display), property, 0, /* long_offset */
52	astrand	263	max_length, /* long_length */
53			False, /* delete */
54			AnyPropertyType, /* req_type */
55			&actual_type_return,
56			&actual_format_return,
57			nitems_return, &bytes_after_return, prop_return);
58
59			if (result != Success)
60			{
61			fprintf(stderr, "XGetWindowProperty failed\n");
62			return (-1);
63			}
64
65			if (actual_type_return == None \|\| actual_format_return == 0)
66			{
67			fprintf(stderr, "Root window is missing property %s\n", propname);
68			return (-1);
69			}
70
71			if (bytes_after_return)
72			{
73			fprintf(stderr, "%s is too big for me\n", propname);
74			return (-1);
75			}
76
77			if (actual_format_return != 32)
78			{
79			fprintf(stderr, "%s has bad format\n", propname);
80			return (-1);
81			}
82
83			return (0);
84			}
85
86			/*
87			Get current desktop number
88			Returns -1 on error
89			*/
90			static int
91	matthewc	300	get_current_desktop(void)
92	astrand	263	{
93			unsigned long nitems_return;
94	astrand	464	unsigned char *prop_return;
95	astrand	263	int current_desktop;
96
97			if (get_property_value("_NET_CURRENT_DESKTOP", 1, &nitems_return,
98	astrand	464	&prop_return) < 0)
99	astrand	263	return (-1);
100
101			if (nitems_return != 1)
102			{
103			fprintf(stderr, "_NET_CURRENT_DESKTOP has bad length\n");
104			return (-1);
105			}
106
107			current_desktop = *prop_return;
108			XFree(prop_return);
109			return current_desktop;
110			}
111
112			/*
113			Get workarea geometry
114			Returns zero on success, -1 on error
115			*/
116
117			int
118			get_current_workarea(uint32 * x, uint32 * y, uint32 * width, uint32 * height)
119			{
120			int current_desktop;
121			unsigned long nitems_return;
122	astrand	464	unsigned char *prop_return;
123			uint32 *return_words;
124	astrand	263	const uint32 net_workarea_x_offset = 0;
125			const uint32 net_workarea_y_offset = 1;
126			const uint32 net_workarea_width_offset = 2;
127			const uint32 net_workarea_height_offset = 3;
128			const uint32 max_prop_length = 32 * 4; /* Max 32 desktops */
129
130			if (get_property_value("_NET_WORKAREA", max_prop_length, &nitems_return,
131	astrand	464	&prop_return) < 0)
132	astrand	263	return (-1);
133
134			if (nitems_return % 4)
135			{
136			fprintf(stderr, "_NET_WORKAREA has odd length\n");
137			return (-1);
138			}
139
140			current_desktop = get_current_desktop();
141
142			if (current_desktop < 0)
143			return -1;
144
145	astrand	464	return_words = (uint32 *)prop_return;
146	astrand	263
147	astrand	464	x = return_words[current_desktop 4 + net_workarea_x_offset];
148			y = return_words[current_desktop 4 + net_workarea_y_offset];
149			width = return_words[current_desktop 4 + net_workarea_width_offset];
150			height = return_words[current_desktop 4 + net_workarea_height_offset];
151
152	astrand	263	XFree(prop_return);
153
154			return (0);
155
156			}