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- /*
- * $XConsortium: extutil.h,v 1.11 89/12/09 21:12:33 rws Exp $
- *
- * Copyright 1989 Massachusetts Institute of Technology
- *
- * 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 M.I.T. not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * 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.
- *
- * Author: Jim Fulton, MIT X Consortium
- *
- * Xlib Extension-Writing Utilities
- *
- * This package contains utilities for writing the client API for various
- * protocol extensions. THESE INTERFACES ARE NOT PART OF THE X STANDARD AND
- * ARE SUBJECT TO CHANGE!
- */
-
- #ifndef _EXTUTIL_H_
- #define _EXTUTIL_H_
-
- /*
- * We need to keep a list of open displays since the Xlib display list isn't
- * public. We also have to per-display info in a separate block since it isn't
- * stored directly in the Display structure.
- */
- typedef struct _XExtDisplayInfo {
- struct _XExtDisplayInfo *next; /* keep a linked list */
- Display *display; /* which display this is */
- XExtCodes *codes; /* the extension protocol codes */
- caddr_t data; /* extra data for extension to use */
- } XExtDisplayInfo;
-
- typedef struct _XExtensionInfo {
- XExtDisplayInfo *head; /* start of list */
- XExtDisplayInfo *cur; /* most recently used */
- int ndisplays; /* number of displays */
- } XExtensionInfo;
-
- typedef struct _XExtensionHooks {
- int (*create_gc)();
- int (*copy_gc)();
- int (*flush_gc)();
- int (*free_gc)();
- int (*create_font)();
- int (*free_font)();
- int (*close_display)();
- Bool (*wire_to_event)();
- Status (*event_to_wire)();
- int (*error)();
- char *(*error_string)();
- } XExtensionHooks;
-
- extern XExtensionInfo *XextCreateExtension();
- extern void XextDestroyExtension();
- extern XExtDisplayInfo *XextAddDisplay();
- extern int XextRemoveDisplay();
- extern XExtDisplayInfo *XextFindDisplay();
-
- #define XextHasExtension(i) ((i) && ((i)->codes))
- #define XextCheckExtension(dpy,i,name,val) \
- if (!XextHasExtension(i)) { XMissingExtension (dpy, name); return val; }
- #define XextSimpleCheckExtension(dpy,i,name) \
- if (!XextHasExtension(i)) { XMissingExtension (dpy, name); return; }
-
-
- /*
- * helper macros to generate code that is common to all extensions; caller
- * should prefix it with static if extension source is in one file; this
- * could be a utility function, but have to stack 6 unused arguments for
- * something that is called many, many times would be bad.
- */
- #define XEXT_GENERATE_FIND_DISPLAY(proc,extinfo,extname,hooks,nev,data) \
- XExtDisplayInfo *proc (dpy) \
- register Display *dpy; \
- { \
- XExtDisplayInfo *dpyinfo; \
- if (!extinfo) { if (!(extinfo = XextCreateExtension())) return NULL; } \
- if (!(dpyinfo = XextFindDisplay (extinfo, dpy))) \
- dpyinfo = XextAddDisplay (extinfo,dpy,extname,hooks,nev,data); \
- return dpyinfo; \
- }
-
- #define XEXT_GENERATE_CLOSE_DISPLAY(proc,extinfo) \
- int proc (dpy, codes) \
- Display *dpy; \
- XExtCodes *codes; \
- { \
- return XextRemoveDisplay (extinfo, dpy); \
- }
-
- #define XEXT_GENERATE_ERROR_STRING(proc,extname,nerr,errl) \
- char *proc (dpy, code, codes, buf, n) \
- Display *dpy; \
- int code; \
- XExtCodes *codes; \
- char *buf; \
- int n; \
- { \
- code -= codes->first_error; \
- if (code >= 0 && code < nerr) { \
- char tmp[256]; \
- sprintf (tmp, "%s.%d", extname, code); \
- XGetErrorDatabaseText (dpy, "XProtoError", tmp, errl[code], buf, n); \
- return buf; \
- } \
- return (char *)0; \
- }
-
- #endif
-