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-rw-r--r--src/Xdamage.c362
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diff --git a/src/Xdamage.c b/src/Xdamage.c
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+++ b/src/Xdamage.c
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+/*
+ * $Id$
+ *
+ * Copyright © 2003 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission. Keith Packard makes no
+ * representations about the suitability of this software for any purpose. It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "xdamageint.h"
+
+XDamageExtInfo XDamageExtensionInfo;
+
+const char XDamageExtensionName[] = DAMAGE_NAME;
+
+static int
+XDamageCloseDisplay (Display *dpy, XExtCodes *codes);
+
+static Bool
+XDamageWireToEvent(Display *dpy, XEvent *event, xEvent *wire);
+
+static Status
+XDamageEventToWire(Display *dpy, XEvent *event, xEvent *wire);
+
+/*
+ * XDamageExtAddDisplay - add a display to this extension. (Replaces
+ * XextAddDisplay)
+ */
+static XDamageExtDisplayInfo *
+XDamageExtAddDisplay (XDamageExtInfo *extinfo,
+ Display *dpy,
+ const char *ext_name)
+{
+ XDamageExtDisplayInfo *info;
+ int ev;
+
+ info = (XDamageExtDisplayInfo *) Xmalloc (sizeof (XDamageExtDisplayInfo));
+ if (!info) return NULL;
+ info->display = dpy;
+
+ info->codes = XInitExtension (dpy, ext_name);
+
+ /*
+ * if the server has the extension, then we can initialize the
+ * appropriate function vectors
+ */
+ if (info->codes) {
+ xDamageQueryVersionReply rep;
+ xDamageQueryVersionReq *req;
+ XESetCloseDisplay (dpy, info->codes->extension,
+ XDamageCloseDisplay);
+ for (ev = info->codes->first_event;
+ ev < info->codes->first_event + XDamageNumberEvents;
+ ev++)
+ {
+ XESetWireToEvent (dpy, ev, XDamageWireToEvent);
+ XESetEventToWire (dpy, ev, XDamageEventToWire);
+ }
+ /*
+ * Get the version info
+ */
+ LockDisplay (dpy);
+ GetReq (DamageQueryVersion, req);
+ req->reqType = info->codes->major_opcode;
+ req->damageReqType = X_DamageQueryVersion;
+ req->majorVersion = DAMAGE_MAJOR;
+ req->minorVersion = DAMAGE_MINOR;
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue))
+ {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ info->major_version = rep.majorVersion;
+ info->minor_version = rep.minorVersion;
+ UnlockDisplay (dpy);
+ } else {
+ /* The server doesn't have this extension.
+ * Use a private Xlib-internal extension to hang the close_display
+ * hook on so that the "cache" (extinfo->cur) is properly cleaned.
+ * (XBUG 7955)
+ */
+ XExtCodes *codes = XAddExtension(dpy);
+ if (!codes) {
+ XFree(info);
+ return NULL;
+ }
+ XESetCloseDisplay (dpy, codes->extension, XDamageCloseDisplay);
+ }
+
+ /*
+ * now, chain it onto the list
+ */
+ _XLockMutex(_Xglobal_lock);
+ info->next = extinfo->head;
+ extinfo->head = info;
+ extinfo->cur = info;
+ extinfo->ndisplays++;
+ _XUnlockMutex(_Xglobal_lock);
+ return info;
+}
+
+
+/*
+ * XDamageExtRemoveDisplay - remove the indicated display from the
+ * extension object. (Replaces XextRemoveDisplay.)
+ */
+static int
+XDamageExtRemoveDisplay (XDamageExtInfo *extinfo, Display *dpy)
+{
+ XDamageExtDisplayInfo *info, *prev;
+
+ /*
+ * locate this display and its back link so that it can be removed
+ */
+ _XLockMutex(_Xglobal_lock);
+ prev = NULL;
+ for (info = extinfo->head; info; info = info->next) {
+ if (info->display == dpy) break;
+ prev = info;
+ }
+ if (!info) {
+ _XUnlockMutex(_Xglobal_lock);
+ return 0; /* hmm, actually an error */
+ }
+
+ /*
+ * remove the display from the list; handles going to zero
+ */
+ if (prev)
+ prev->next = info->next;
+ else
+ extinfo->head = info->next;
+
+ extinfo->ndisplays--;
+ if (info == extinfo->cur) extinfo->cur = NULL; /* flush cache */
+ _XUnlockMutex(_Xglobal_lock);
+
+ Xfree ((char *) info);
+ return 1;
+}
+
+/*
+ * XDamageExtFindDisplay - look for a display in this extension; keeps a
+ * cache of the most-recently used for efficiency. (Replaces
+ * XextFindDisplay.)
+ */
+static XDamageExtDisplayInfo *
+XDamageExtFindDisplay (XDamageExtInfo *extinfo,
+ Display *dpy)
+{
+ XDamageExtDisplayInfo *info;
+
+ /*
+ * see if this was the most recently accessed display
+ */
+ if ((info = extinfo->cur) && info->display == dpy)
+ return info;
+
+ /*
+ * look for display in list
+ */
+ _XLockMutex(_Xglobal_lock);
+ for (info = extinfo->head; info; info = info->next) {
+ if (info->display == dpy) {
+ extinfo->cur = info; /* cache most recently used */
+ _XUnlockMutex(_Xglobal_lock);
+ return info;
+ }
+ }
+ _XUnlockMutex(_Xglobal_lock);
+
+ return NULL;
+}
+
+XDamageExtDisplayInfo *
+XDamageFindDisplay (Display *dpy)
+{
+ XDamageExtDisplayInfo *info;
+
+ info = XDamageExtFindDisplay (&XDamageExtensionInfo, dpy);
+ if (!info)
+ info = XDamageExtAddDisplay (&XDamageExtensionInfo, dpy,
+ XDamageExtensionName);
+ return info;
+}
+
+static int
+XDamageCloseDisplay (Display *dpy, XExtCodes *codes)
+{
+ return XDamageExtRemoveDisplay (&XDamageExtensionInfo, dpy);
+}
+
+static Bool
+XDamageWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay(dpy);
+
+ XDamageCheckExtension(dpy, info, False);
+
+ switch ((wire->u.u.type & 0x7F) - info->codes->first_event)
+ {
+ case XDamageNotify: {
+ XDamageNotifyEvent *aevent = (XDamageNotifyEvent *) event;
+ xDamageNotifyEvent *awire = (xDamageNotifyEvent *) wire;
+
+ aevent->type = awire->type & 0x7F;
+ aevent->serial = _XSetLastRequestRead(dpy,
+ (xGenericReply *) wire);
+ aevent->send_event = (awire->type & 0x80) != 0;
+ aevent->display = dpy;
+ aevent->drawable = awire->drawable;
+ aevent->damage = awire->damage;
+ aevent->level = awire->level;
+ aevent->timestamp = awire->timestamp;
+ aevent->area.x = awire->area.x;
+ aevent->area.y = awire->area.y;
+ aevent->area.width = awire->area.width;
+ aevent->area.height = awire->area.height;
+ aevent->geometry.x = awire->geometry.x;
+ aevent->geometry.y = awire->geometry.y;
+ aevent->geometry.width = awire->geometry.width;
+ aevent->geometry.height = awire->geometry.height;
+ return True;
+ }
+ }
+ return False;
+}
+
+static Status
+XDamageEventToWire(Display *dpy, XEvent *event, xEvent *wire)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay(dpy);
+
+ XDamageCheckExtension(dpy, info, False);
+
+ switch ((event->type & 0x7F) - info->codes->first_event)
+ {
+ case XDamageNotify: {
+ XDamageNotifyEvent *aevent;
+ xDamageNotifyEvent *awire;
+ awire = (xDamageNotifyEvent *) wire;
+ aevent = (XDamageNotifyEvent *) event;
+ awire->type = aevent->type | (aevent->send_event ? 0x80 : 0);
+ awire->drawable = aevent->drawable;
+ awire->damage = aevent->damage;
+ awire->level = aevent->level;
+ awire->timestamp = aevent->timestamp;
+ awire->area.x = aevent->area.x;
+ awire->area.y = aevent->area.y;
+ awire->area.width = aevent->area.width;
+ awire->area.height = aevent->area.height;
+ awire->geometry.x = aevent->geometry.x;
+ awire->geometry.y = aevent->geometry.y;
+ awire->geometry.width = aevent->geometry.width;
+ awire->geometry.height = aevent->geometry.height;
+ return True;
+ }
+ }
+ return False;
+}
+
+Bool
+XDamageQueryExtension (Display *dpy, int *event_basep, int *error_basep)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay (dpy);
+
+ if (XDamageHasExtension(info))
+ {
+ *event_basep = info->codes->first_event;
+ *error_basep = info->codes->first_error;
+ return True;
+ }
+ else
+ return False;
+}
+
+Status
+XDamageQueryVersion (Display *dpy,
+ int *major_versionp,
+ int *minor_versionp)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay (dpy);
+
+ XDamageCheckExtension (dpy, info, 0);
+
+ *major_versionp = info->major_version;
+ *minor_versionp = info->minor_version;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 1;
+}
+
+Damage
+XDamageCreate (Display *dpy, Drawable drawable, int level)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay (dpy);
+ xDamageCreateReq *req;
+ Damage damage;
+
+ XDamageCheckExtension (dpy, info, 0);
+ LockDisplay (dpy);
+ GetReq (DamageCreate, req);
+ req->reqType = info->codes->major_opcode;
+ req->damageReqType = X_DamageCreate;
+ req->damage = damage = XAllocID (dpy);
+ req->drawable = drawable;
+ req->level = level;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return damage;
+}
+
+void
+XDamageDestroy (Display *dpy, Damage damage)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay (dpy);
+ xDamageDestroyReq *req;
+
+ XDamageSimpleCheckExtension (dpy, info);
+ LockDisplay (dpy);
+ GetReq (DamageDestroy, req);
+ req->reqType = info->codes->major_opcode;
+ req->damageReqType = X_DamageDestroy;
+ req->damage = damage;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+}
+
+void
+XDamageSubtract (Display *dpy, Damage damage,
+ XserverRegion repair, XserverRegion parts)
+{
+ XDamageExtDisplayInfo *info = XDamageFindDisplay (dpy);
+ xDamageSubtractReq *req;
+
+ XDamageSimpleCheckExtension (dpy, info);
+ LockDisplay (dpy);
+ GetReq (DamageSubtract, req);
+ req->reqType = info->codes->major_opcode;
+ req->damageReqType = X_DamageSubtract;
+ req->damage = damage;
+ req->repair = repair;
+ req->parts = parts;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+}