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EXTENSIO
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EXTUTIL.H
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C/C++ Source or Header
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1989-12-09
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4KB
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124 lines
/*
* $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