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/* Cairo - a vector graphics library with display and print output
*
* Copyright © 2007 Chris Wilson
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Chris Wilson.
*
* Contributor(s):
* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
*/
#include "cairoint.h"
#include "cairo-xlib-private.h"
#include "cairo-xlib-xrender-private.h"
#include <fontconfig/fontconfig.h>
#include <X11/Xlibint.h> /* For XESetCloseDisplay */
typedef int (*cairo_xlib_error_func_t) (Display *display,
XErrorEvent *event);
struct _cairo_xlib_job {
cairo_xlib_job_t *next;
enum {
RESOURCE,
WORK
} type;
union {
struct {
cairo_xlib_notify_resource_func notify;
XID xid;
} resource;
struct {
cairo_xlib_notify_func notify;
void *data;
void (*destroy) (void *);
} work;
} func;
};
static cairo_xlib_display_t *_cairo_xlib_display_list;
static int buggy_repeat_force = -1;
static void
_cairo_xlib_remove_close_display_hook_internal (cairo_xlib_display_t *display,
cairo_xlib_hook_t *hook);
static void
_cairo_xlib_call_close_display_hooks (cairo_xlib_display_t *display)
{
cairo_xlib_screen_info_t *screen;
cairo_xlib_hook_t *hook;
/* call all registered shutdown routines */
CAIRO_MUTEX_LOCK (display->mutex);
for (screen = display->screens; screen != NULL; screen = screen->next)
_cairo_xlib_screen_info_close_display (screen);
while (TRUE) {
hook = display->close_display_hooks;
if (hook == NULL)
break;
_cairo_xlib_remove_close_display_hook_internal (display, hook);
CAIRO_MUTEX_UNLOCK (display->mutex);
hook->func (display, hook);
CAIRO_MUTEX_LOCK (display->mutex);
}
display->closed = TRUE;
CAIRO_MUTEX_UNLOCK (display->mutex);
}
static void
_cairo_xlib_display_discard_screens (cairo_xlib_display_t *display)
{
cairo_xlib_screen_info_t *screens;
CAIRO_MUTEX_LOCK (display->mutex);
screens = display->screens;
display->screens = NULL;
CAIRO_MUTEX_UNLOCK (display->mutex);
while (screens != NULL) {
cairo_xlib_screen_info_t *screen = screens;
screens = screen->next;
_cairo_xlib_screen_info_destroy (screen);
}
}
cairo_xlib_display_t *
_cairo_xlib_display_reference (cairo_xlib_display_t *display)
{
assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&display->ref_count));
_cairo_reference_count_inc (&display->ref_count);
return display;
}
void
_cairo_xlib_display_destroy (cairo_xlib_display_t *display)
{
assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&display->ref_count));
if (! _cairo_reference_count_dec_and_test (&display->ref_count))
return;
/* destroy all outstanding notifies */
while (display->workqueue != NULL) {
cairo_xlib_job_t *job = display->workqueue;
display->workqueue = job->next;
if (job->type == WORK && job->func.work.destroy != NULL)
job->func.work.destroy (job->func.work.data);
_cairo_freelist_free (&display->wq_freelist, job);
}
_cairo_freelist_fini (&display->wq_freelist);
CAIRO_MUTEX_FINI (display->mutex);
free (display);
}
static int
_noop_error_handler (Display *display,
XErrorEvent *event)
{
return False; /* return value is ignored */
}
static int
_cairo_xlib_close_display (Display *dpy, XExtCodes *codes)
{
cairo_xlib_display_t *display, **prev, *next;
cairo_xlib_error_func_t old_handler;
CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);
for (display = _cairo_xlib_display_list; display; display = display->next)
if (display->display == dpy)
break;
CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);
if (display == NULL)
return 0;
/* protect the notifies from triggering XErrors */
XSync (dpy, False);
old_handler = XSetErrorHandler (_noop_error_handler);
_cairo_xlib_display_notify (display);
_cairo_xlib_call_close_display_hooks (display);
_cairo_xlib_display_discard_screens (display);
/* catch any that arrived before marking the display as closed */
_cairo_xlib_display_notify (display);
XSync (dpy, False);
XSetErrorHandler (old_handler);
/*
* Unhook from the global list
*/
CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);
prev = &_cairo_xlib_display_list;
for (display = _cairo_xlib_display_list; display; display = next) {
next = display->next;
if (display->display == dpy) {
*prev = next;
break;
} else
prev = &display->next;
}
CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);
assert (display != NULL);
_cairo_xlib_display_destroy (display);
/* Return value in accordance with requirements of
* XESetCloseDisplay */
return 0;
}
cairo_xlib_display_t *
_cairo_xlib_display_get (Display *dpy)
{
cairo_xlib_display_t *display;
cairo_xlib_display_t **prev;
XExtCodes *codes;
int major_unused, minor_unused;
/* There is an apparent deadlock between this mutex and the
* mutex for the display, but it's actually safe. For the
* app to call XCloseDisplay() while any other thread is
* inside this function would be an error in the logic
* app, and the CloseDisplay hook is the only other place we
* acquire this mutex.
*/
CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);
for (prev = &_cairo_xlib_display_list; (display = *prev); prev = &(*prev)->next)
{
if (display->display == dpy) {
/*
* MRU the list
*/
if (prev != &_cairo_xlib_display_list) {
*prev = display->next;
display->next = _cairo_xlib_display_list;
_cairo_xlib_display_list = display;
}
break;
}
}
if (display != NULL) {
display = _cairo_xlib_display_reference (display);
goto UNLOCK;
}
display = malloc (sizeof (cairo_xlib_display_t));
if (display == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
goto UNLOCK;
}
/* Xlib calls out to the extension close_display hooks in LIFO
* order. So we have to ensure that all extensions that we depend
* on in our close_display hook are properly initialized before we
* add our hook. For now, that means Render, so we call into its
* QueryVersion function to ensure it gets initialized.
*/
XRenderQueryVersion (dpy, &major_unused, &minor_unused);
codes = XAddExtension (dpy);
if (codes == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
free (display);
display = NULL;
goto UNLOCK;
}
XESetCloseDisplay (dpy, codes->extension, _cairo_xlib_close_display);
_cairo_freelist_init (&display->wq_freelist, sizeof (cairo_xlib_job_t));
CAIRO_REFERENCE_COUNT_INIT (&display->ref_count, 2); /* add one for the CloseDisplay */
CAIRO_MUTEX_INIT (display->mutex);
display->display = dpy;
display->screens = NULL;
display->workqueue = NULL;
display->close_display_hooks = NULL;
display->closed = FALSE;
memset (display->cached_xrender_formats, 0,
sizeof (display->cached_xrender_formats));
display->buggy_repeat = FALSE;
/* This buggy_repeat condition is very complicated because there
* are multiple X server code bases (with multiple versioning
* schemes within a code base), and multiple bugs.
*
* The X servers:
*
* 1. The Vendor=="XFree86" code base with release numbers such
* as 4.7.0 (VendorRelease==40700000).
*
* 2. The Vendor=="X.Org" code base (a descendant of the
* XFree86 code base). It originally had things like
* VendorRelease==60700000 for release 6.7.0 but then changed
* its versioning scheme so that, for example,
* VendorRelease==10400000 for the 1.4.0 X server within the
* X.Org 7.3 release.
*
* The bugs:
*
* 1. The original bug that led to the buggy_repeat
* workaround. This was a bug that Owen Taylor investigated,
* understood well, and characterized against carious X
* servers. Confirmed X servers with this bug include:
*
* "XFree86" <= 40500000
* "X.Org" <= 60802000 (only with old numbering >= 60700000)
*
* 2. A separate bug resulting in a crash of the X server when
* using cairo's extend-reflect test case, (which, surprisingly
* enough was not passing RepeatReflect to the X server, but
* instead using RepeatNormal in a workaround). Nobody to date
* has understood the bug well, but it appears to be gone as of
* the X.Org 1.4.0 server. This bug is coincidentally avoided
* by using the same buggy_repeat workaround. Confirmed X
* servers with this bug include:
*
* "X.org" == 60900000 (old versioning scheme)
* "X.org" < 10400000 (new numbering scheme)
*
* For the old-versioning-scheme X servers we don't know
* exactly when second the bug started, but since bug 1 is
* present through 6.8.2 and bug 2 is present in 6.9.0 it seems
* safest to just blacklist all old-versioning-scheme X servers,
* (just using VendorRelase < 70000000), as buggy_repeat=TRUE.
*/
if (strstr (ServerVendor (dpy), "X.Org") != NULL) {
if (VendorRelease (dpy) >= 60700000 && VendorRelease (dpy) < 70000000)
display->buggy_repeat = TRUE;
if (VendorRelease (dpy) < 10400000)
display->buggy_repeat = TRUE;
} else if (strstr (ServerVendor (dpy), "XFree86") != NULL) {
if (VendorRelease (dpy) <= 40500000)
display->buggy_repeat = TRUE;
}
/* XXX workaround; see https://bugzilla.mozilla.org/show_bug.cgi?id=413583 */
if (buggy_repeat_force == -1) {
if (getenv("MOZ_CAIRO_BUGGY_REPEAT"))
buggy_repeat_force = 1;
else
buggy_repeat_force = 0;
}
if (buggy_repeat_force)
display->buggy_repeat = TRUE;
display->next = _cairo_xlib_display_list;
_cairo_xlib_display_list = display;
UNLOCK:
CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);
return display;
}
void
_cairo_xlib_add_close_display_hook (cairo_xlib_display_t *display,
cairo_xlib_hook_t *hook)
{
CAIRO_MUTEX_LOCK (display->mutex);
hook->prev = NULL;
hook->next = display->close_display_hooks;
if (hook->next != NULL)
hook->next->prev = hook;
display->close_display_hooks = hook;
CAIRO_MUTEX_UNLOCK (display->mutex);
}
/* display->mutex must be held */
static void
_cairo_xlib_remove_close_display_hook_internal (cairo_xlib_display_t *display,
cairo_xlib_hook_t *hook)
{
if (display->close_display_hooks == hook)
display->close_display_hooks = hook->next;
else if (hook->prev != NULL)
hook->prev->next = hook->next;
if (hook->next != NULL)
hook->next->prev = hook->prev;
hook->prev = NULL;
hook->next = NULL;
}
void
_cairo_xlib_remove_close_display_hook (cairo_xlib_display_t *display,
cairo_xlib_hook_t *hook)
{
CAIRO_MUTEX_LOCK (display->mutex);
_cairo_xlib_remove_close_display_hook_internal (display, hook);
CAIRO_MUTEX_UNLOCK (display->mutex);
}
cairo_status_t
_cairo_xlib_display_queue_resource (cairo_xlib_display_t *display,
cairo_xlib_notify_resource_func notify,
XID xid)
{
cairo_xlib_job_t *job;
cairo_status_t status = CAIRO_STATUS_NO_MEMORY;
CAIRO_MUTEX_LOCK (display->mutex);
if (display->closed == FALSE) {
job = _cairo_freelist_alloc (&display->wq_freelist);
if (job != NULL) {
job->type = RESOURCE;
job->func.resource.xid = xid;
job->func.resource.notify = notify;
job->next = display->workqueue;
display->workqueue = job;
status = CAIRO_STATUS_SUCCESS;
}
}
CAIRO_MUTEX_UNLOCK (display->mutex);
return status;
}
cairo_status_t
_cairo_xlib_display_queue_work (cairo_xlib_display_t *display,
cairo_xlib_notify_func notify,
void *data,
void (*destroy) (void *))
{
cairo_xlib_job_t *job;
cairo_status_t status = CAIRO_STATUS_NO_MEMORY;
CAIRO_MUTEX_LOCK (display->mutex);
if (display->closed == FALSE) {
job = _cairo_freelist_alloc (&display->wq_freelist);
if (job != NULL) {
job->type = WORK;
job->func.work.data = data;
job->func.work.notify = notify;
job->func.work.destroy = destroy;
job->next = display->workqueue;
display->workqueue = job;
status = CAIRO_STATUS_SUCCESS;
}
}
CAIRO_MUTEX_UNLOCK (display->mutex);
return status;
}
void
_cairo_xlib_display_notify (cairo_xlib_display_t *display)
{
cairo_xlib_job_t *jobs, *job, *freelist;
Display *dpy = display->display;
CAIRO_MUTEX_LOCK (display->mutex);
jobs = display->workqueue;
while (jobs != NULL) {
display->workqueue = NULL;
CAIRO_MUTEX_UNLOCK (display->mutex);
/* reverse the list to obtain FIFO order */
job = NULL;
do {
cairo_xlib_job_t *next = jobs->next;
jobs->next = job;
job = jobs;
jobs = next;
} while (jobs != NULL);
freelist = jobs = job;
do {
job = jobs;
jobs = job->next;
switch (job->type){
case WORK:
job->func.work.notify (dpy, job->func.work.data);
if (job->func.work.destroy != NULL)
job->func.work.destroy (job->func.work.data);
break;
case RESOURCE:
job->func.resource.notify (dpy, job->func.resource.xid);
break;
}
} while (jobs != NULL);
CAIRO_MUTEX_LOCK (display->mutex);
do {
job = freelist;
freelist = job->next;
_cairo_freelist_free (&display->wq_freelist, job);
} while (freelist != NULL);
jobs = display->workqueue;
}
CAIRO_MUTEX_UNLOCK (display->mutex);
}
XRenderPictFormat *
_cairo_xlib_display_get_xrender_format (cairo_xlib_display_t *display,
cairo_format_t format)
{
XRenderPictFormat *xrender_format;
CAIRO_MUTEX_LOCK (display->mutex);
xrender_format = display->cached_xrender_formats[format];
if (xrender_format == NULL) {
int pict_format;
switch (format) {
case CAIRO_FORMAT_A1:
pict_format = PictStandardA1; break;
case CAIRO_FORMAT_A8:
pict_format = PictStandardA8; break;
case CAIRO_FORMAT_RGB24:
pict_format = PictStandardRGB24; break;
default:
ASSERT_NOT_REACHED;
case CAIRO_FORMAT_ARGB32:
pict_format = PictStandardARGB32; break;
}
xrender_format = XRenderFindStandardFormat (display->display,
pict_format);
display->cached_xrender_formats[format] = xrender_format;
}
CAIRO_MUTEX_UNLOCK (display->mutex);
return xrender_format;
}
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