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-rw-r--r--libXext/src/Xge.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/libXext/src/Xge.c b/libXext/src/Xge.c
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+++ b/libXext/src/Xge.c
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+/*
+ * Copyright © 2007-2008 Peter Hutterer
+ *
+ * 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 (including the next
+ * paragraph) 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 OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors: Peter Hutterer, University of South Australia, NICTA
+ */
+
+/*
+ * XGE is an extension to re-use a single opcode for multiple events,
+ * depending on the extension. XGE allows events >32 bytes.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define NEED_EVENTS
+#define NEED_REPLIES
+
+#include <stdio.h>
+#include <X11/extensions/geproto.h>
+#include <X11/extensions/ge.h>
+#include <X11/Xlibint.h>
+#include <X11/extensions/extutil.h>
+#include <X11/extensions/Xge.h>
+
+/***********************************************************************/
+/* internal data structures */
+/***********************************************************************/
+
+typedef struct {
+ int present;
+ short major_version;
+ short minor_version;
+} XGEVersionRec;
+
+/* NULL terminated list of registered extensions. */
+typedef struct _XGEExtNode {
+ int extension;
+ XExtensionHooks* hooks;
+ struct _XGEExtNode* next;
+} XGEExtNode, *XGEExtList;
+
+/* Internal data for GE extension */
+typedef struct _XGEData {
+ XEvent data;
+ XGEVersionRec *vers;
+ XGEExtList extensions;
+} XGEData;
+
+
+/* forward declarations */
+static XExtDisplayInfo* _xgeFindDisplay(Display*);
+static Bool _xgeWireToEvent(Display*, XEvent*, xEvent*);
+static Status _xgeEventToWire(Display*, XEvent*, xEvent*);
+static int _xgeDpyClose(Display*, XExtCodes*);
+static XGEVersionRec* _xgeGetExtensionVersion(Display*,
+ _Xconst char*,
+ XExtDisplayInfo*);
+static Bool _xgeCheckExtension(Display* dpy, XExtDisplayInfo* info);
+
+/* main extension information data */
+static XExtensionInfo *xge_info;
+static char xge_extension_name[] = GE_NAME;
+static XExtensionHooks xge_extension_hooks = {
+ NULL, /* create_gc */
+ NULL, /* copy_gc */
+ NULL, /* flush_gc */
+ NULL, /* free_gc */
+ NULL, /* create_font */
+ NULL, /* free_font */
+ _xgeDpyClose, /* close_display */
+ _xgeWireToEvent, /* wire_to_event */
+ _xgeEventToWire, /* event_to_wire */
+ NULL, /* error */
+ NULL, /* error_string */
+};
+
+
+static XExtDisplayInfo *_xgeFindDisplay(Display *dpy)
+{
+ XExtDisplayInfo *dpyinfo;
+ if (!xge_info)
+ {
+ if (!(xge_info = XextCreateExtension()))
+ return NULL;
+ }
+ if (!(dpyinfo = XextFindDisplay (xge_info, dpy)))
+ {
+ dpyinfo = XextAddDisplay (xge_info,
+ dpy,
+ xge_extension_name,
+ &xge_extension_hooks,
+ 0 /* no events, see below */,
+ NULL);
+ /* We don't use an extension opcode, so we have to set the handlers
+ * directly. If GenericEvent would be > 64, the job would be done by
+ * XExtAddDisplay */
+ XESetWireToEvent (dpy,
+ GenericEvent,
+ xge_extension_hooks.wire_to_event);
+ XESetEventToWire (dpy,
+ GenericEvent,
+ xge_extension_hooks.event_to_wire);
+ }
+ return dpyinfo;
+}
+
+/*
+ * Check extension is set up and internal data fields are filled.
+ */
+static Bool
+_xgeCheckExtInit(Display* dpy, XExtDisplayInfo* info)
+{
+ LockDisplay(dpy);
+ if(!_xgeCheckExtension(dpy, info))
+ {
+ goto cleanup;
+ }
+
+ if (!info->data)
+ {
+ XGEData* data = (XGEData*)Xmalloc(sizeof(XGEData));
+ if (!data) {
+ goto cleanup;
+ }
+ /* get version from server */
+ data->vers =
+ _xgeGetExtensionVersion(dpy, "Generic Event Extension", info);
+ data->extensions = NULL;
+ info->data = (XPointer)data;
+ }
+
+ UnlockDisplay(dpy);
+ return True;
+
+cleanup:
+ UnlockDisplay(dpy);
+ return False;
+}
+
+/* Return 1 if XGE extension exists, 0 otherwise. */
+static Bool
+_xgeCheckExtension(Display* dpy, XExtDisplayInfo* info)
+{
+ return XextHasExtension(info);
+}
+
+
+/* Retrieve XGE version number from server. */
+static XGEVersionRec*
+_xgeGetExtensionVersion(Display* dpy,
+ _Xconst char* name,
+ XExtDisplayInfo*info)
+{
+ xGEQueryVersionReply rep;
+ xGEQueryVersionReq *req;
+ XGEVersionRec *vers;
+
+ GetReq(GEQueryVersion, req);
+ req->reqType = info->codes->major_opcode;
+ req->ReqType = X_GEQueryVersion;
+ req->majorVersion = GE_MAJOR;
+ req->minorVersion = GE_MINOR;
+
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue))
+ {
+ Xfree(info);
+ return NULL;
+ }
+
+ vers = (XGEVersionRec*)Xmalloc(sizeof(XGEVersionRec));
+ vers->major_version = rep.majorVersion;
+ vers->minor_version = rep.minorVersion;
+ return vers;
+}
+
+/*
+ * Display closing routine.
+ */
+
+static int
+_xgeDpyClose(Display* dpy, XExtCodes* codes)
+{
+ XExtDisplayInfo *info = _xgeFindDisplay(dpy);
+
+ if (info->data != NULL) {
+ XGEData* xge_data = (XGEData*)info->data;
+
+ if (xge_data->extensions)
+ {
+ XGEExtList current, next;
+ current = xge_data->extensions;
+ while(current)
+ {
+ next = current->next;
+ Xfree(current);
+ current = next;
+ }
+ }
+
+ XFree(xge_data->vers);
+ XFree(xge_data);
+ }
+
+ return XextRemoveDisplay(xge_info, dpy);
+}
+
+/*
+ * protocol to Xlib event conversion routine.
+ */
+static Bool
+_xgeWireToEvent(Display* dpy, XEvent* re, xEvent *event)
+{
+ int extension;
+ XGEExtList it;
+ XExtDisplayInfo* info = _xgeFindDisplay(dpy);
+ if (!info)
+ return False;
+ /*
+ _xgeCheckExtInit() calls LockDisplay, leading to a SIGABRT.
+ Well, I guess we don't need the data we get in CheckExtInit anyway
+ if (!_xgeCheckExtInit(dpy, info))
+ return False;
+ */
+
+ extension = ((xGenericEvent*)event)->extension;
+
+ it = ((XGEData*)info->data)->extensions;
+ while(it)
+ {
+ if (it->extension == extension)
+ {
+ return (it->hooks->wire_to_event(dpy, re, event));
+ }
+ it = it->next;
+ }
+
+ fprintf(stderr,
+ "_xgeWireToEvent: Unknown extension %d, this should never happen.\n",
+ extension);
+ return False;
+}
+
+/*
+ * xlib event to protocol conversion routine.
+ */
+static Status
+_xgeEventToWire(Display* dpy, XEvent* re, xEvent* event)
+{
+ int extension;
+ XGEExtList it;
+ XExtDisplayInfo* info = _xgeFindDisplay(dpy);
+ if (!info)
+ return 1; /* error! */
+
+ extension = ((XGenericEvent*)re)->extension;
+
+ it = ((XGEData*)info->data)->extensions;
+ while(it)
+ {
+ if (it->extension == extension)
+ {
+ return (it->hooks->event_to_wire(dpy, re, event));
+ }
+ it = it->next;
+ }
+
+ fprintf(stderr,
+ "_xgeEventToWire: Unknown extension %d, this should never happen.\n",
+ extension);
+
+ return Success;
+}
+
+/*
+ * Extensions need to register callbacks for their events.
+ */
+Bool
+xgeExtRegister(Display* dpy, int offset, XExtensionHooks* callbacks)
+{
+ XGEExtNode* newExt;
+ XGEData* xge_data;
+
+ XExtDisplayInfo* info = _xgeFindDisplay(dpy);
+ if (!info)
+ return False; /* error! */
+
+ if (!_xgeCheckExtInit(dpy, info))
+ return False;
+
+ xge_data = (XGEData*)info->data;
+
+ newExt = (XGEExtNode*)Xmalloc(sizeof(XGEExtNode));
+ if (!newExt)
+ {
+ fprintf(stderr, "xgeExtRegister: Failed to alloc memory.\n");
+ return False;
+ }
+
+ newExt->extension = offset;
+ newExt->hooks = callbacks;
+ newExt->next = xge_data->extensions;
+ xge_data->extensions = newExt;
+
+ return True;
+}
+
+/***********************************************************************/
+/* Client interfaces */
+/***********************************************************************/
+
+/* Set event_base and error_base to the matching values for XGE.
+ * Note that since XGE doesn't use any errors and events, the actual return
+ * value is of limited use.
+ */
+Bool
+XGEQueryExtension(Display* dpy, int* event_base, int* error_base)
+{
+ XExtDisplayInfo* info = _xgeFindDisplay(dpy);
+ if (!_xgeCheckExtInit(dpy, info))
+ return False;
+
+ *event_base = info->codes->first_event;
+ *error_base = info->codes->first_error;
+ return True;
+}
+
+/* Get XGE version number.
+ * Doesn't actually get it from server, that should have been done beforehand
+ * already
+ */
+Bool
+XGEQueryVersion(Display* dpy,
+ int *major_version,
+ int *minor_version)
+{
+ XExtDisplayInfo* info = _xgeFindDisplay(dpy);
+ if (!info)
+ return False;
+
+ if (!_xgeCheckExtInit(dpy, info))
+ return False;
+
+ *major_version = ((XGEData*)info->data)->vers->major_version;
+ *minor_version = ((XGEData*)info->data)->vers->minor_version;
+
+ return True;
+}
+
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