xenocara/lib/xcb-util-renderutil/renderutil/cache.c
2014-04-14 19:30:59 +00:00

235 lines
6.9 KiB
C

/* 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) (1 << ((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;
}