1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/* Copyright © 2006 Jamey Sharp.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the names of the authors or their
* institutions shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization from the authors.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "xcb_renderutil.h"
#include <stdlib.h>
#include <pthread.h>
typedef struct connection_cache {
struct connection_cache *next; /* keep a linked list */
xcb_connection_t *c; /* which display this is */
xcb_render_query_version_reply_t *version;
xcb_render_query_pict_formats_reply_t *formats;
} connection_cache;
static struct {
pthread_mutex_t lock;
connection_cache *head; /* start of the list */
connection_cache *cur; /* most recently used */
} connections = { PTHREAD_MUTEX_INITIALIZER };
/*
* If the server is missing support for any of the required depths on
* any screen, tell the application that Render is not present.
*/
#define DEPTH_MASK(d) (1U << ((d) - 1))
/*
* Render requires support for depth 1, 4, 8, 24 and 32 pixmaps
*/
#define REQUIRED_DEPTHS (DEPTH_MASK(1) | \
DEPTH_MASK(4) | \
DEPTH_MASK(8) | \
DEPTH_MASK(24) | \
DEPTH_MASK(32))
/* Test each depth not explicitly advertised to see if pixmap creation
* succeeds: if it does, that depth is usable. */
static int
pixmap_depths_usable (xcb_connection_t *c, uint32_t missing, xcb_pixmap_t pixmap, xcb_drawable_t root)
{
xcb_void_cookie_t create_cookie[32] = { { 0 } };
xcb_void_cookie_t free_cookie[32] = { { 0 } };
int d;
int success = 1;
for (d = 1; d <= 32; d++)
if (missing & DEPTH_MASK(d))
{
create_cookie[d - 1] = xcb_create_pixmap_checked (c, d, pixmap, root, 1, 1);
free_cookie[d - 1] = xcb_free_pixmap_checked (c, pixmap);
if (!create_cookie[d - 1].sequence || !free_cookie[d - 1].sequence)
{
success = 0;
break;
}
}
for (d = 0; d < 32; d++)
if (create_cookie[d].sequence || free_cookie[d].sequence)
{
xcb_generic_error_t *create_error = xcb_request_check (c, create_cookie[d]);
xcb_generic_error_t *free_error = xcb_request_check (c, free_cookie[d]);
success = success && !create_error;
free(create_error);
free(free_error);
}
return success;
}
static int
has_required_depths (xcb_connection_t *c)
{
xcb_screen_iterator_t screens;
xcb_pixmap_t pixmap = { -1 };
for (screens = xcb_setup_roots_iterator(xcb_get_setup(c)); screens.rem; xcb_screen_next(&screens))
{
xcb_depth_iterator_t depths;
uint32_t missing = REQUIRED_DEPTHS;
xcb_drawable_t root;
for (depths = xcb_screen_allowed_depths_iterator(screens.data); depths.rem; xcb_depth_next(&depths))
missing &= ~DEPTH_MASK(depths.data->depth);
if (!missing)
continue;
/*
* Ok, this is ugly. It should be sufficient at this
* point to just return false, but Xinerama is broken at
* this point and only advertises depths which have an
* associated visual. Of course, the other depths still
* work, but the only way to find out is to try them.
*/
if (pixmap == -1)
pixmap = xcb_generate_id(c);
root = screens.data->root;
if (!pixmap_depths_usable (c, missing, pixmap, root))
return 0;
}
return 1;
}
static connection_cache *
find_or_create_display (xcb_connection_t *c)
{
connection_cache *info;
xcb_render_query_version_cookie_t version_cookie;
xcb_render_query_pict_formats_cookie_t formats_cookie;
int present;
/*
* look for display in list
*/
for (info = connections.head; info; info = info->next)
if (info->c == c) {
connections.cur = info; /* cache most recently used */
return info;
}
/*
* don't already have this display: add it.
*/
info = malloc (sizeof (connection_cache));
if (!info)
return NULL;
info->c = c;
version_cookie = xcb_render_query_version(c, 0, 10);
formats_cookie = xcb_render_query_pict_formats(c);
xcb_flush(c);
present = has_required_depths (c);
info->version = xcb_render_query_version_reply(c, version_cookie, 0);
info->formats = xcb_render_query_pict_formats_reply(c, formats_cookie, 0);
if (!present || !info->version || !info->formats)
{
free(info->version);
info->version = 0;
free(info->formats);
info->formats = 0;
}
/* Check for the lack of sub-pixel data */
else if (info->version->major_version == 0 && info->version->minor_version < 6)
info->formats->num_subpixel = 0;
/*
* now, chain it onto the list
*/
info->next = connections.head;
connections.head = info;
connections.cur = info;
return info;
}
static connection_cache *
find_display (xcb_connection_t *c)
{
connection_cache *info;
/*
* see if this was the most recently accessed display
*/
if ((info = connections.cur) && info->c == c)
return info;
pthread_mutex_lock(&connections.lock);
info = find_or_create_display (c);
pthread_mutex_unlock(&connections.lock);
return info;
}
const xcb_render_query_version_reply_t *
xcb_render_util_query_version (xcb_connection_t *c)
{
connection_cache *info = find_display (c);
if (!info)
return 0;
return info->version;
}
const xcb_render_query_pict_formats_reply_t *
xcb_render_util_query_formats (xcb_connection_t *c)
{
connection_cache *info = find_display (c);
if (!info)
return 0;
return info->formats;
}
int
xcb_render_util_disconnect (xcb_connection_t *c)
{
connection_cache **prev, *cur = NULL;
pthread_mutex_lock(&connections.lock);
for(prev = &connections.head; *prev; prev = &(*prev)->next)
if((*prev)->c == c)
{
cur = *prev;
*prev = cur->next;
if(cur == connections.cur)
connections.cur = NULL; /* flush cache */
free(cur->version);
free(cur->formats);
free(cur);
break;
}
pthread_mutex_unlock(&connections.lock);
return cur != NULL;
}
|
