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extutil.h

/*
 * $Xorg: extutil.h,v 1.4 2001/02/09 02:03:24 xorgcvs Exp $
 *
Copyright 1989, 1998  The Open Group

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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!
 */
/* $XFree86: xc/include/extensions/extutil.h,v 1.9 2001/12/14 19:53:28 dawes Exp $ */

#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 */,
    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]; \
      sprintf (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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