1 /***
2 This file is part of PulseAudio.
3
4 Copyright 2004-2006 Lennart Poettering
5
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
10
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #include <string.h>
25
26 #include "x11prop.h"
27
28 #include <pulsecore/macro.h>
29
30 #include <xcb/xproto.h>
31
32 #define PA_XCB_FORMAT 8
33
screen_of_display(xcb_connection_t * xcb,int screen)34 static xcb_screen_t *screen_of_display(xcb_connection_t *xcb, int screen) {
35 const xcb_setup_t *s;
36 xcb_screen_iterator_t iter;
37
38 if ((s = xcb_get_setup(xcb))) {
39 iter = xcb_setup_roots_iterator(s);
40 for (; iter.rem; --screen, xcb_screen_next(&iter))
41 if (0 == screen)
42 return iter.data;
43 }
44 return NULL;
45 }
46
pa_x11_set_prop(xcb_connection_t * xcb,int screen,const char * name,const char * data)47 void pa_x11_set_prop(xcb_connection_t *xcb, int screen, const char *name, const char *data) {
48 xcb_screen_t *xs;
49 xcb_intern_atom_reply_t *reply;
50
51 pa_assert(xcb);
52 pa_assert(name);
53 pa_assert(data);
54
55 if ((xs = screen_of_display(xcb, screen))) {
56 reply = xcb_intern_atom_reply(xcb,
57 xcb_intern_atom(xcb, 0, strlen(name), name),
58 NULL);
59
60 if (reply) {
61 xcb_change_property(xcb, XCB_PROP_MODE_REPLACE, xs->root, reply->atom,
62 XCB_ATOM_STRING, PA_XCB_FORMAT,
63 (int) strlen(data), (const void*) data);
64
65 free(reply);
66 }
67 }
68 }
69
pa_x11_del_prop(xcb_connection_t * xcb,int screen,const char * name)70 void pa_x11_del_prop(xcb_connection_t *xcb, int screen, const char *name) {
71 xcb_screen_t *xs;
72 xcb_intern_atom_reply_t *reply;
73
74 pa_assert(xcb);
75 pa_assert(name);
76
77 if ((xs = screen_of_display(xcb, screen))) {
78 reply = xcb_intern_atom_reply(xcb,
79 xcb_intern_atom(xcb, 0, strlen(name), name),
80 NULL);
81
82 if (reply) {
83 xcb_delete_property(xcb, xs->root, reply->atom);
84 free(reply);
85 }
86 }
87 }
88
pa_x11_get_prop(xcb_connection_t * xcb,int screen,const char * name,char * p,size_t l)89 char* pa_x11_get_prop(xcb_connection_t *xcb, int screen, const char *name, char *p, size_t l) {
90 char *ret = NULL;
91 int len;
92 xcb_get_property_cookie_t req;
93 xcb_get_property_reply_t* prop = NULL;
94 xcb_screen_t *xs;
95 xcb_intern_atom_reply_t *reply;
96
97 pa_assert(xcb);
98 pa_assert(name);
99 pa_assert(p);
100
101 xs = screen_of_display(xcb, screen);
102 /*
103 * Also try and get the settings from the first screen.
104 * This allows for e.g. a Media Center to run on screen 1 (e.g. HDMI) and have
105 * different defaults (e.g. prefer the HDMI sink) than the primary screen 0
106 * which uses the Internal Audio sink.
107 */
108 if (!xs && 0 != screen)
109 xs = screen_of_display(xcb, 0);
110
111 if (xs) {
112 reply = xcb_intern_atom_reply(xcb,
113 xcb_intern_atom(xcb, 0, strlen(name), name),
114 NULL);
115
116 if (!reply)
117 goto finish;
118
119 req = xcb_get_property(xcb, 0, xs->root, reply->atom, XCB_ATOM_STRING, 0, (uint32_t)(l-1));
120 free(reply);
121 prop = xcb_get_property_reply(xcb, req, NULL);
122
123 if (!prop)
124 goto finish;
125
126 if (PA_XCB_FORMAT != prop->format)
127 goto finish;
128
129 len = xcb_get_property_value_length(prop);
130 if (len < 1 || len >= (int)l)
131 goto finish;
132
133 memcpy(p, xcb_get_property_value(prop), len);
134 p[len] = 0;
135
136 ret = p;
137 }
138
139 finish:
140
141 if (prop)
142 free(prop);
143
144 return ret;
145 }
146