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/*
*
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*
* Author: Jim Fulton, MIT The Open Group
*
* 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_
#include <X11/extensions/Xext.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 */
XPointer 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)(
Display* /* display */,
GC /* gc */,
XExtCodes* /* codes */
);
int (*copy_gc)(
Display* /* display */,
GC /* gc */,
XExtCodes* /* codes */
);
int (*flush_gc)(
Display* /* display */,
GC /* gc */,
XExtCodes* /* codes */
);
int (*free_gc)(
Display* /* display */,
GC /* gc */,
XExtCodes* /* codes */
);
int (*create_font)(
Display* /* display */,
XFontStruct* /* fs */,
XExtCodes* /* codes */
);
int (*free_font)(
Display* /* display */,
XFontStruct* /* fs */,
XExtCodes* /* codes */
);
int (*close_display)(
Display* /* display */,
XExtCodes* /* codes */
);
Bool (*wire_to_event)(
Display* /* display */,
XEvent* /* re */,
xEvent* /* event */
);
Status (*event_to_wire)(
Display* /* display */,
XEvent* /* re */,
xEvent* /* event */
);
int (*error)(
Display* /* display */,
xError* /* err */,
XExtCodes* /* codes */,
int* /* ret_code */
);
char *(*error_string)(
Display* /* display */,
int /* code */,
XExtCodes* /* codes */,
char* /* buffer */,
int /* nbytes */
);
} XExtensionHooks;
extern XExtensionInfo *XextCreateExtension(
void
);
extern void XextDestroyExtension(
XExtensionInfo* /* info */
);
extern XExtDisplayInfo *XextAddDisplay(
XExtensionInfo* /* extinfo */,
Display* /* dpy */,
_Xconst char* /* ext_name */,
XExtensionHooks* /* hooks */,
int /* nevents */,
XPointer /* data */
);
extern int XextRemoveDisplay(
XExtensionInfo* /* extinfo */,
Display* /* dpy */
);
extern XExtDisplayInfo *XextFindDisplay(
XExtensionInfo* /* extinfo */,
Display* /* dpy */
);
#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 (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_FIND_DISPLAY_PROTO(proc) \
XExtDisplayInfo *proc(Display *dpy)
#define XEXT_GENERATE_CLOSE_DISPLAY(proc,extinfo) \
int proc (Display *dpy, XExtCodes *codes) \
{ \
return XextRemoveDisplay (extinfo, dpy); \
}
#define XEXT_CLOSE_DISPLAY_PROTO(proc) \
int proc(Display *dpy, XExtCodes *codes)
#define XEXT_GENERATE_ERROR_STRING(proc,extname,nerr,errl) \
char *proc (Display *dpy, int code, XExtCodes *codes, char *buf, int n) \
{ \
code -= codes->first_error; \
if (code >= 0 && code < nerr) { \
char tmp[256]; \
snprintf (tmp, sizeof(tmp), "%s.%d", extname, code); \
XGetErrorDatabaseText (dpy, "XProtoError", tmp, errl[code], buf, n); \
return buf; \
} \
return (char *)0; \
}
#define XEXT_ERROR_STRING_PROTO(proc) \
char *proc(Display *dpy, int code, XExtCodes *codes, char *buf, int n)
#endif
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