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view src/video/Xext/Xxf86vm/XF86VMode.c @ 4167:a6f635e5eaa6 SDL-1.2

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Fixed bug #611 From Tim Angus 2008-08-12 11:18:06 I'm one of the maintainers of ioquake3.org, an updated version of the Quake 3 engine. Relatively recently, we moved ioq3 to use SDL as a replacement for 95% of the platform specific code that was there. On the whole it's doing a great job but unfortunately since the move we've been getting complaints about the quality of the mouse input on the Windows platform to the point where for many the game is unplayable. Put in other terms, the current stable SDL 1.2 is basically not fit for purpose if you need high quality mouse input as you do in a first person shooter. Over the weekend I decided to pull my finger out and actually figure out what's going on. There are basically two major problems. Firstly, when using the "windib" driver, mouse input is gathered via the WM_MOUSEMOVE message. Googling for this indicates that often this is known to result in "spurious" and/or "missing" mouse movement events; this is the primary cause of the poor mouse input. The second problem is that the "directx" driver does not work at all in combination with OpenGL meaning that you can't use DirectInput if your application also uses OpenGL. In other words you're locked into using the "windib" driver and its poor mouse input. In order to address these problems I've done the following: * Remove WM_MOUSEMOVE based motion event generation and replace with calls to GetCursorPos which seems much more reliable. In order to achieve this I've moved mouse motion out into a separate function that is called once per DIB_PumpEvents. * Remove the restriction on the "directx" driver being inoperable in combination with OpenGL. There is a bug for this issues that I've hijacked to a certain extent (http://bugzilla.libsdl.org/show_bug.cgi?id=265). I'm the first to admit I don't really understand why this restriction is there in the first place. The commit message for the bug fix that introduced this restriction (r581) isn't very elaborate and I couldn't see any other bug tracking the issue. If anyone has more information on the bug that was avoided by r581 it would be helpful as I/someone could then look into addressing the problem without disabling the "directx" driver. * I've also removed the restriction on not being allowed to use DirectInput in windowed mode. I couldn't see any reason for this, at least not from our perspective. I have my suspicions that it'll be something like matching up the cursor with the mouse coordinates... * I bumped up the DirectInput API used to version 7 in order to get access to mouse buttons 4-7. I've had to inject a little bit of the DX7 headers into SDL there as the MinGW ones aren't up to date in this respect.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Apr 2009 04:43:36 +0000
parents db4007f17bc8
children
line wrap: on
line source

/* $XConsortium: XF86VMode.c /main/2 1995/11/14 18:17:58 kaleb $ */
/* $XFree86: xc/lib/Xxf86vm/XF86VMode.c,v 3.32 2001/07/25 15:04:54 dawes Exp $ */
/*

Copyright (c) 1995  Kaleb S. KEITHLEY

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 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 Kaleb S. KEITHLEY 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.

Except as contained in this notice, the name of Kaleb S. KEITHLEY 
shall not be used in advertising or otherwise to promote the sale, use 
or other dealings in this Software without prior written authorization
from Kaleb S. KEITHLEY.

*/
/* $XConsortium: XF86VMode.c /main/4 1996/01/16 07:52:25 kaleb CHECKEDOUT $ */

/* THIS IS NOT AN X CONSORTIUM STANDARD */

#define NEED_EVENTS
#define NEED_REPLIES

#ifndef XBUILD_IN_CLIENT
/* Apparently some X11 systems can't include this multiple times... */
#ifndef SDL_INCLUDED_XLIBINT_H
#define SDL_INCLUDED_XLIBINT_H 1
#include <X11/Xlibint.h>
#endif
#include "../extensions/xf86vmstr.h"
#include "../extensions/Xext.h"
#include "../extensions/extutil.h"
#else
#include "include/extensions/xf86vmstr.h"
#include "include/extensions/Xext.h"
#include "include/extensions/extutil.h"
#endif

#ifdef DEBUG
#include <stdio.h>
#endif

#ifndef MODE_BAD
#define MODE_BAD 255
#endif

static XExtensionInfo _xf86vidmode_info_data;
static XExtensionInfo *xf86vidmode_info = &_xf86vidmode_info_data;
static char *xf86vidmode_extension_name = XF86VIDMODENAME;

#define XF86VidModeCheckExtension(dpy,i,val) \
  XextCheckExtension (dpy, i, xf86vidmode_extension_name, val)

/*****************************************************************************
 *                                                                           *
 *			   private utility routines                          *
 *                                                                           *
 *****************************************************************************/

static XEXT_CLOSE_DISPLAY_PROTO(close_display);
static /* const */ XExtensionHooks xf86vidmode_extension_hooks = {
    NULL,				/* create_gc */
    NULL,				/* copy_gc */
    NULL,				/* flush_gc */
    NULL,				/* free_gc */
    NULL,				/* create_font */
    NULL,				/* free_font */
    close_display,			/* close_display */
    NULL,				/* wire_to_event */
    NULL,				/* event_to_wire */
    NULL,				/* error */
    NULL,				/* error_string */
};

static XEXT_GENERATE_FIND_DISPLAY (find_display, xf86vidmode_info, 
				   xf86vidmode_extension_name, 
				   &xf86vidmode_extension_hooks, 
				   0, NULL)

static XEXT_GENERATE_CLOSE_DISPLAY (close_display, xf86vidmode_info)


/*****************************************************************************
 *                                                                           *
 *		    public XFree86-VidMode Extension routines                *
 *                                                                           *
 *****************************************************************************/

Bool
SDL_NAME(XF86VidModeQueryExtension) (dpy, event_basep, error_basep)
    Display *dpy;
    int *event_basep, *error_basep;
{
    XExtDisplayInfo *info = find_display (dpy);

    if (XextHasExtension(info)) {
	*event_basep = info->codes->first_event;
	*error_basep = info->codes->first_error;
	return True;
    } else {
	return False;
    }
}

Bool
SDL_NAME(XF86VidModeQueryVersion)(dpy, majorVersion, minorVersion)
    Display* dpy;
    int* majorVersion; 
    int* minorVersion;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeQueryVersionReply rep;
    xXF86VidModeQueryVersionReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeQueryVersion, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeQueryVersion;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    *majorVersion = rep.majorVersion;
    *minorVersion = rep.minorVersion;
    UnlockDisplay(dpy);
    SyncHandle();
    if (*majorVersion >= 2)
	SDL_NAME(XF86VidModeSetClientVersion)(dpy);
    return True;
}

Bool
SDL_NAME(XF86VidModeSetClientVersion)(Display *dpy)
{
    XExtDisplayInfo *info = find_display(dpy);
    xXF86VidModeSetClientVersionReq *req;

    XF86VidModeCheckExtension(dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetClientVersion, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetClientVersion;
    req->major = XF86VIDMODE_MAJOR_VERSION;
    req->minor = XF86VIDMODE_MINOR_VERSION;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetGamma)(Display *dpy, int screen, SDL_NAME(XF86VidModeGamma) *Gamma)
{
    XExtDisplayInfo *info = find_display(dpy);
    xXF86VidModeSetGammaReq *req;

    XF86VidModeCheckExtension(dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetGamma, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetGamma;
    req->screen = screen;
    req->red = (CARD32)(Gamma->red * 10000.);
    req->green = (CARD32)(Gamma->green * 10000.);
    req->blue = (CARD32)(Gamma->blue * 10000.);
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetGamma)(Display *dpy, int screen, SDL_NAME(XF86VidModeGamma) *Gamma)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaReply rep;
    xXF86VidModeGetGammaReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGamma, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGamma;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    Gamma->red = ((float)rep.red) / 10000.;
    Gamma->green = ((float)rep.green) / 10000.;
    Gamma->blue = ((float)rep.blue) / 10000.;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetModeLine)(dpy, screen, dotclock, modeline)
    Display* dpy;
    int screen;
    int* dotclock; 
    SDL_NAME(XF86VidModeModeLine)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetModeLineReply rep;
    xXF86OldVidModeGetModeLineReply oldrep;
    xXF86VidModeGetModeLineReq *req;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, False);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetModeLine, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetModeLine;
    req->screen = screen;
    
    if (majorVersion < 2) {
	if (!_XReply(dpy, (xReply *)&oldrep, 
            (SIZEOF(xXF86OldVidModeGetModeLineReply) - SIZEOF(xReply)) >> 2, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*dotclock = oldrep.dotclock;
	modeline->hdisplay   = oldrep.hdisplay;
	modeline->hsyncstart = oldrep.hsyncstart;
	modeline->hsyncend   = oldrep.hsyncend;
	modeline->htotal     = oldrep.htotal;
	modeline->hskew      = 0;
	modeline->vdisplay   = oldrep.vdisplay;
	modeline->vsyncstart = oldrep.vsyncstart;
	modeline->vsyncend   = oldrep.vsyncend;
	modeline->vtotal     = oldrep.vtotal;
	modeline->flags      = oldrep.flags;
	modeline->privsize   = oldrep.privsize;
    } else {
	if (!_XReply(dpy, (xReply *)&rep, 
            (SIZEOF(xXF86VidModeGetModeLineReply) - SIZEOF(xReply)) >> 2, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*dotclock = rep.dotclock;
	modeline->hdisplay   = rep.hdisplay;
	modeline->hsyncstart = rep.hsyncstart;
	modeline->hsyncend   = rep.hsyncend;
	modeline->htotal     = rep.htotal;
	modeline->hskew      = rep.hskew;
	modeline->vdisplay   = rep.vdisplay;
	modeline->vsyncstart = rep.vsyncstart;
	modeline->vsyncend   = rep.vsyncend;
	modeline->vtotal     = rep.vtotal;
	modeline->flags      = rep.flags;
	modeline->privsize   = rep.privsize;
    }
    
    if (modeline->privsize > 0) {
	if (!(modeline->private = Xcalloc(modeline->privsize, sizeof(INT32)))) {
	    _XEatData(dpy, (modeline->privsize) * sizeof(INT32));
	    Xfree(modeline->private);
	    return False;
	}
	_XRead(dpy, (char*)modeline->private, modeline->privsize * sizeof(INT32));
    } else {
	modeline->private = NULL;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetAllModeLines)(dpy, screen, modecount, modelinesPtr)
    Display* dpy;
    int screen;
    int* modecount; 
    SDL_NAME(XF86VidModeModeInfo) ***modelinesPtr;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetAllModeLinesReply rep;
    xXF86VidModeGetAllModeLinesReq *req;
    SDL_NAME(XF86VidModeModeInfo) *mdinfptr, **modelines;
    xXF86VidModeModeInfo xmdline;
    xXF86OldVidModeModeInfo oldxmdline;
    int i;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (the .private field wasn't being passed over the wire).
     * Check the server's version, and accept the old format if appropriate.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeGetAllModeLines: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    
    LockDisplay(dpy);
    GetReq(XF86VidModeGetAllModeLines, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetAllModeLines;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 
        (SIZEOF(xXF86VidModeGetAllModeLinesReply) - SIZEOF(xReply)) >> 2, xFalse)) {
        UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }

    *modecount = rep.modecount;

    if (!(modelines = (SDL_NAME(XF86VidModeModeInfo) **) Xcalloc(rep.modecount,
                                          sizeof(SDL_NAME(XF86VidModeModeInfo) *)
                                          +sizeof(SDL_NAME(XF86VidModeModeInfo))))) {
	if (majorVersion < 2)
            _XEatData(dpy, (rep.modecount) * sizeof(xXF86OldVidModeModeInfo));
	else
            _XEatData(dpy, (rep.modecount) * sizeof(xXF86VidModeModeInfo));
        Xfree(modelines);
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }
    mdinfptr = (SDL_NAME(XF86VidModeModeInfo) *) (
			    (char *) modelines
			    + rep.modecount*sizeof(SDL_NAME(XF86VidModeModeInfo) *)
		    );

    for (i = 0; i < rep.modecount; i++) {
        modelines[i] = mdinfptr++;
	if (majorVersion < 2) {
            _XRead(dpy, (char*)&oldxmdline, sizeof(xXF86OldVidModeModeInfo));
	    modelines[i]->dotclock   = oldxmdline.dotclock;
	    modelines[i]->hdisplay   = oldxmdline.hdisplay;
	    modelines[i]->hsyncstart = oldxmdline.hsyncstart;
	    modelines[i]->hsyncend   = oldxmdline.hsyncend;
	    modelines[i]->htotal     = oldxmdline.htotal;
	    modelines[i]->hskew      = 0;
	    modelines[i]->vdisplay   = oldxmdline.vdisplay;
	    modelines[i]->vsyncstart = oldxmdline.vsyncstart;
	    modelines[i]->vsyncend   = oldxmdline.vsyncend;
	    modelines[i]->vtotal     = oldxmdline.vtotal;
	    modelines[i]->flags      = oldxmdline.flags;
	    if (protocolBug) {
		modelines[i]->privsize = 0;
		modelines[i]->private = NULL;
	    } else {
		modelines[i]->privsize   = oldxmdline.privsize;
		if (oldxmdline.privsize > 0) {
	            if (!(modelines[i]->private =
			    Xcalloc(oldxmdline.privsize, sizeof(INT32)))) {
			_XEatData(dpy, (oldxmdline.privsize) * sizeof(INT32));
			Xfree(modelines[i]->private);
		    } else {
			_XRead(dpy, (char*)modelines[i]->private,
			     oldxmdline.privsize * sizeof(INT32));
		    }
		} else {
		  modelines[i]->private = NULL;
		}
	    }
	} else {
            _XRead(dpy, (char*)&xmdline, sizeof(xXF86VidModeModeInfo));
	    modelines[i]->dotclock   = xmdline.dotclock;
	    modelines[i]->hdisplay   = xmdline.hdisplay;
	    modelines[i]->hsyncstart = xmdline.hsyncstart;
	    modelines[i]->hsyncend   = xmdline.hsyncend;
	    modelines[i]->htotal     = xmdline.htotal;
	    modelines[i]->hskew      = xmdline.hskew;
	    modelines[i]->vdisplay   = xmdline.vdisplay;
	    modelines[i]->vsyncstart = xmdline.vsyncstart;
	    modelines[i]->vsyncend   = xmdline.vsyncend;
	    modelines[i]->vtotal     = xmdline.vtotal;
	    modelines[i]->flags      = xmdline.flags;
	    if (protocolBug) {
		modelines[i]->privsize = 0;
		modelines[i]->private = NULL;
	    } else {
		modelines[i]->privsize   = xmdline.privsize;
		if (xmdline.privsize > 0) {
		    if (!(modelines[i]->private =
			    Xcalloc(xmdline.privsize, sizeof(INT32)))) {
			_XEatData(dpy, (xmdline.privsize) * sizeof(INT32));
			Xfree(modelines[i]->private);
		    } else {
			_XRead(dpy, (char*)modelines[i]->private,
			     xmdline.privsize * sizeof(INT32));
		    }
		} else {
		    modelines[i]->private = NULL;
		}
	    }
	}
    }
    *modelinesPtr = modelines;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

/*
 * GetReq replacement for use with VidMode protocols earlier than 2.0
 */
#if !defined(UNIXCPP) || defined(ANSICPP)
#define GetOldReq(name, oldname, req) \
        WORD64ALIGN\
	if ((dpy->bufptr + SIZEOF(x##oldname##Req)) > dpy->bufmax)\
		_XFlush(dpy);\
	req = (x##oldname##Req *)(dpy->last_req = dpy->bufptr);\
	req->reqType = X_##name;\
	req->length = (SIZEOF(x##oldname##Req))>>2;\
	dpy->bufptr += SIZEOF(x##oldname##Req);\
	dpy->request++

#else  /* non-ANSI C uses empty comment instead of "##" for token concatenation */
#define GetOldReq(name, oldname, req) \
        WORD64ALIGN\
	if ((dpy->bufptr + SIZEOF(x/**/oldname/**/Req)) > dpy->bufmax)\
		_XFlush(dpy);\
	req = (x/**/oldname/**/Req *)(dpy->last_req = dpy->bufptr);\
	req->reqType = X_/**/name;\
	req->length = (SIZEOF(x/**/oldname/**/Req))>>2;\
	dpy->bufptr += SIZEOF(x/**/oldname/**/Req);\
	dpy->request++
#endif

Bool
SDL_NAME(XF86VidModeAddModeLine) (dpy, screen, newmodeline, aftermodeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* newmodeline;
    SDL_NAME(XF86VidModeModeInfo)* aftermodeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeAddModeLineReq *req;
    xXF86OldVidModeAddModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, False);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeAddModeLine, XF86OldVidModeAddModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeAddModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	newmodeline->dotclock;
	oldreq->hdisplay =	newmodeline->hdisplay;
	oldreq->hsyncstart =	newmodeline->hsyncstart;
	oldreq->hsyncend =	newmodeline->hsyncend;
	oldreq->htotal =	newmodeline->htotal;
	oldreq->vdisplay =	newmodeline->vdisplay;
	oldreq->vsyncstart =	newmodeline->vsyncstart;
	oldreq->vsyncend =	newmodeline->vsyncend;
	oldreq->vtotal =	newmodeline->vtotal;
	oldreq->flags =		newmodeline->flags;
	oldreq->privsize =	newmodeline->privsize;
	if (aftermodeline != NULL) {
	    oldreq->after_dotclock =	aftermodeline->dotclock;
	    oldreq->after_hdisplay =	aftermodeline->hdisplay;
	    oldreq->after_hsyncstart =	aftermodeline->hsyncstart;
	    oldreq->after_hsyncend =	aftermodeline->hsyncend;
	    oldreq->after_htotal =	aftermodeline->htotal;
	    oldreq->after_vdisplay =	aftermodeline->vdisplay;
	    oldreq->after_vsyncstart =	aftermodeline->vsyncstart;
	    oldreq->after_vsyncend =	aftermodeline->vsyncend;
	    oldreq->after_vtotal =	aftermodeline->vtotal;
	    oldreq->after_flags =	aftermodeline->flags;
	} else {
	    oldreq->after_dotclock =	0;
	    oldreq->after_hdisplay =	0;
	    oldreq->after_hsyncstart =	0;
	    oldreq->after_hsyncend =	0;
	    oldreq->after_htotal =	0;
	    oldreq->after_vdisplay =	0;
	    oldreq->after_vsyncstart =	0;
	    oldreq->after_vsyncend =	0;
	    oldreq->after_vtotal =	0;
	    oldreq->after_flags =	0;
	}
	if (newmodeline->privsize) {
	    oldreq->length += newmodeline->privsize;
	    Data32(dpy, (long *) newmodeline->private,
	       newmodeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeAddModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeAddModeLine;
	req->screen = screen;
	req->dotclock =		newmodeline->dotclock;
	req->hdisplay =		newmodeline->hdisplay;
	req->hsyncstart =	newmodeline->hsyncstart;
	req->hsyncend =		newmodeline->hsyncend;
	req->htotal =		newmodeline->htotal;
	req->hskew =		newmodeline->hskew;
	req->vdisplay =		newmodeline->vdisplay;
	req->vsyncstart =	newmodeline->vsyncstart;
	req->vsyncend =		newmodeline->vsyncend;
	req->vtotal =		newmodeline->vtotal;
	req->flags =		newmodeline->flags;
	req->privsize =		newmodeline->privsize;
	if (aftermodeline != NULL) {
	    req->after_dotclock =	aftermodeline->dotclock;
	    req->after_hdisplay =	aftermodeline->hdisplay;
	    req->after_hsyncstart =	aftermodeline->hsyncstart;
	    req->after_hsyncend =	aftermodeline->hsyncend;
	    req->after_htotal =		aftermodeline->htotal;
	    req->after_hskew =		aftermodeline->hskew;
	    req->after_vdisplay =	aftermodeline->vdisplay;
	    req->after_vsyncstart =	aftermodeline->vsyncstart;
	    req->after_vsyncend =	aftermodeline->vsyncend;
	    req->after_vtotal =		aftermodeline->vtotal;
	    req->after_flags =		aftermodeline->flags;
	} else {
	    req->after_dotclock =	0;
	    req->after_hdisplay =	0;
	    req->after_hsyncstart =	0;
	    req->after_hsyncend =	0;
	    req->after_htotal =		0;
	    req->after_hskew =		0;
	    req->after_vdisplay =	0;
	    req->after_vsyncstart =	0;
	    req->after_vsyncend =	0;
	    req->after_vtotal =		0;
	    req->after_flags =		0;
	}
	if (newmodeline->privsize) {
	    req->length += newmodeline->privsize;
	    Data32(dpy, (long *) newmodeline->private,
	       newmodeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeDeleteModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeDeleteModeLineReq *req;
    xXF86OldVidModeDeleteModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeDeleteModeLine, XF86OldVidModeDeleteModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeDeleteModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeDeleteModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeDeleteModeLine;
	req->screen = screen;
	req->dotclock =		modeline->dotclock;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeModModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeLine)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeModModeLineReq *req;
    xXF86OldVidModeModModeLineReq *oldreq;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeModModeLine, XF86OldVidModeModModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeModModeLine;
	oldreq->screen = screen;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeModModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeModModeLine;
	req->screen = screen;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Status
SDL_NAME(XF86VidModeValidateModeLine) (dpy, screen, modeline)
    Display *dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeValidateModeLineReq *req;
    xXF86OldVidModeValidateModeLineReq *oldreq;
    xXF86VidModeValidateModeLineReply rep;
    int majorVersion, minorVersion;

    XF86VidModeCheckExtension (dpy, info, 0);
    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);

    LockDisplay(dpy);

    if (majorVersion < 2) {
	GetOldReq(XF86VidModeValidateModeLine, XF86OldVidModeValidateModeLine, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeValidateModeLine;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =		modeline->flags;
	oldreq->privsize =	modeline->privsize;
	if (modeline->privsize) {
	    oldreq->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    } else {
	GetReq(XF86VidModeValidateModeLine, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeValidateModeLine;
	req->screen = screen;
	req->dotclock =		modeline->dotclock;
	req->hdisplay =		modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =		modeline->hsyncend;
	req->htotal =		modeline->htotal;
	req->hskew =		modeline->hskew;
	req->vdisplay =		modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =		modeline->vsyncend;
	req->vtotal =		modeline->vtotal;
	req->flags =		modeline->flags;
	req->privsize =		modeline->privsize;
	if (modeline->privsize) {
	    req->length += modeline->privsize;
	    Data32(dpy, (long *) modeline->private,
	       modeline->privsize * sizeof(INT32));
	}
    }
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return MODE_BAD;
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return rep.status;
}

Bool
SDL_NAME(XF86VidModeSwitchMode)(dpy, screen, zoom)
    Display* dpy;
    int screen;
    int zoom;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSwitchModeReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSwitchMode, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSwitchMode;
    req->screen = screen;
    req->zoom = zoom;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeSwitchToMode)(dpy, screen, modeline)
    Display* dpy;
    int screen;
    SDL_NAME(XF86VidModeModeInfo)* modeline;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSwitchToModeReq *req;
    xXF86OldVidModeSwitchToModeReq *oldreq;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (the .private field wasn't expected to be sent over
     * the wire).  Check the server's version, and accept the old format
     * if appropriate.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeSwitchToMode: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    
    LockDisplay(dpy);
    if (majorVersion < 2) {
	GetOldReq(XF86VidModeSwitchToMode, XF86OldVidModeSwitchToMode, oldreq);
	oldreq->reqType = info->codes->major_opcode;
	oldreq->xf86vidmodeReqType = X_XF86VidModeSwitchToMode;
	oldreq->screen = screen;
	oldreq->dotclock =	modeline->dotclock;
	oldreq->hdisplay =	modeline->hdisplay;
	oldreq->hsyncstart =	modeline->hsyncstart;
	oldreq->hsyncend =	modeline->hsyncend;
	oldreq->htotal =	modeline->htotal;
	oldreq->vdisplay =	modeline->vdisplay;
	oldreq->vsyncstart =	modeline->vsyncstart;
	oldreq->vsyncend =	modeline->vsyncend;
	oldreq->vtotal =	modeline->vtotal;
	oldreq->flags =	modeline->flags;
	if (protocolBug) {
	    oldreq->privsize = 0;
	} else {
	    oldreq->privsize =	modeline->privsize;
	    if (modeline->privsize) {
		oldreq->length += modeline->privsize;
		Data32(dpy, (long *) modeline->private,
	           modeline->privsize * sizeof(INT32));
	    }
	}
    } else {
	GetReq(XF86VidModeSwitchToMode, req);
	req->reqType = info->codes->major_opcode;
	req->xf86vidmodeReqType = X_XF86VidModeSwitchToMode;
	req->screen = screen;
	req->dotclock =	modeline->dotclock;
	req->hdisplay =	modeline->hdisplay;
	req->hsyncstart =	modeline->hsyncstart;
	req->hsyncend =	modeline->hsyncend;
	req->htotal =	modeline->htotal;
	req->hskew =	modeline->hskew;
	req->vdisplay =	modeline->vdisplay;
	req->vsyncstart =	modeline->vsyncstart;
	req->vsyncend =	modeline->vsyncend;
	req->vtotal =	modeline->vtotal;
	req->flags =	modeline->flags;
	if (protocolBug) {
	    req->privsize = 0;
	} else {
	    req->privsize =	modeline->privsize;
	    if (modeline->privsize) {
		req->length += modeline->privsize;
		Data32(dpy, (long *) modeline->private,
	           modeline->privsize * sizeof(INT32));
	    }
	}
    }
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeLockModeSwitch)(dpy, screen, lock)
    Display* dpy;
    int screen;
    int lock;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeLockModeSwitchReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeLockModeSwitch, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeLockModeSwitch;
    req->screen = screen;
    req->lock = lock;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}
    
Bool
SDL_NAME(XF86VidModeGetMonitor)(dpy, screen, monitor)
    Display* dpy;
    int screen;
    SDL_NAME(XF86VidModeMonitor)* monitor;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetMonitorReply rep;
    xXF86VidModeGetMonitorReq *req;
    CARD32 syncrange;
    int i;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetMonitor, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetMonitor;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return False;
    }
    monitor->nhsync = rep.nhsync;
    monitor->nvsync = rep.nvsync;
#if 0
    monitor->bandwidth = (float)rep.bandwidth / 1e6;
#endif
    if (rep.vendorLength) {
	if (!(monitor->vendor = (char *)Xcalloc(rep.vendorLength + 1, 1))) {
	    _XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		      ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
            UnlockDisplay(dpy);
            SyncHandle();
	    return False;
	}
    } else {
	monitor->vendor = NULL;
    }
    if (rep.modelLength) {
	if (!(monitor->model = Xcalloc(rep.modelLength + 1, 1))) {
	    _XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		      ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	    if (monitor->vendor)
		Xfree(monitor->vendor);
            UnlockDisplay(dpy);
            SyncHandle();
	    return False;
	}
    } else {
	monitor->model = NULL;
    }
    if (!(monitor->hsync = Xcalloc(rep.nhsync, sizeof(SDL_NAME(XF86VidModeSyncRange))))) {
	_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		  ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	
	if (monitor->vendor)
	    Xfree(monitor->vendor);
	if (monitor->model)
	    Xfree(monitor->model);
        UnlockDisplay(dpy);
        SyncHandle();
	return False;
    }
    if (!(monitor->vsync = Xcalloc(rep.nvsync, sizeof(SDL_NAME(XF86VidModeSyncRange))))) {
	_XEatData(dpy, (rep.nhsync + rep.nvsync) * 4 +
		  ((rep.vendorLength+3) & ~3) + ((rep.modelLength+3) & ~3));
	if (monitor->vendor)
	    Xfree(monitor->vendor);
	if (monitor->model)
	    Xfree(monitor->model);
	Xfree(monitor->hsync);
        UnlockDisplay(dpy);
        SyncHandle();
	return False;
    }
    for (i = 0; i < rep.nhsync; i++) {
	_XRead(dpy, (char *)&syncrange, 4);
	monitor->hsync[i].lo = (float)(syncrange & 0xFFFF) / 100.0;
	monitor->hsync[i].hi = (float)(syncrange >> 16) / 100.0;
    }
    for (i = 0; i < rep.nvsync; i++) {
	_XRead(dpy, (char *)&syncrange, 4);
	monitor->vsync[i].lo = (float)(syncrange & 0xFFFF) / 100.0;
	monitor->vsync[i].hi = (float)(syncrange >> 16) / 100.0;
    }
    if (rep.vendorLength)
	_XReadPad(dpy, monitor->vendor, rep.vendorLength);
    else
	monitor->vendor = "";
    if (rep.modelLength)
	_XReadPad(dpy, monitor->model, rep.modelLength);
    else
	monitor->model = "";
	
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetViewPort)(dpy, screen, x, y)
    Display* dpy;
    int screen;
    int *x, *y;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetViewPortReply rep;
    xXF86VidModeGetViewPortReq *req;
    int majorVersion, minorVersion;
    Bool protocolBug = False;

    XF86VidModeCheckExtension (dpy, info, False);

    /*
     * Note: There was a bug in the protocol implementation in versions
     * 0.x with x < 8 (no reply was sent, so the client would hang)
     * Check the server's version, and don't wait for a reply with older
     * versions.
     */

    SDL_NAME(XF86VidModeQueryVersion)(dpy, &majorVersion, &minorVersion);
    if (majorVersion == 0 && minorVersion < 8) {
	protocolBug = True;
#ifdef DEBUG
	fprintf(stderr, "XF86VidModeGetViewPort: Warning: Xserver is"
		"running an old version (%d.%d)\n", majorVersion,
		minorVersion);
#endif
    }
    LockDisplay(dpy);
    GetReq(XF86VidModeGetViewPort, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetViewPort;
    req->screen = screen;
    if (protocolBug) {
	*x = 0;
	*y = 0;
    } else {
	if (!_XReply(dpy, (xReply *)&rep, 0, xFalse)) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return False;
	}
	*x = rep.x;
	*y = rep.y;
    }

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetViewPort)(dpy, screen, x, y)
    Display* dpy;
    int screen;
    int x, y;
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSetViewPortReq *req;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeSetViewPort, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetViewPort;
    req->screen = screen;
    req->x = x;
    req->y = y;

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeGetDotClocks)(dpy, screen,
	    flagsPtr, numclocksPtr, maxclocksPtr, clocksPtr)
    Display* dpy;
    int screen;
    int *flagsPtr, *numclocksPtr, *maxclocksPtr, *clocksPtr[]; 
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetDotClocksReply rep;
    xXF86VidModeGetDotClocksReq *req;
    int i, *dotclocks;
    CARD32 dotclk;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetDotClocks, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetDotClocks;
    req->screen = screen;
    if (!_XReply(dpy, (xReply *)&rep, 
        (SIZEOF(xXF86VidModeGetDotClocksReply) - SIZEOF(xReply)) >> 2, xFalse))
    {
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }
    *numclocksPtr = rep.clocks;
    *maxclocksPtr = rep.maxclocks;
    *flagsPtr     = rep.flags;

    if (!(dotclocks = (int*) Xcalloc(rep.clocks, sizeof(int)))) {
        _XEatData(dpy, (rep.clocks) * 4);
        Xfree(dotclocks);
        UnlockDisplay(dpy);
        SyncHandle();
        return False;
    }

    for (i = 0; i < rep.clocks; i++) {
        _XRead(dpy, (char*)&dotclk, 4);
	dotclocks[i] = dotclk;
    }
    *clocksPtr = dotclocks;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool
SDL_NAME(XF86VidModeSetGammaRamp) (
    Display *dpy,
    int screen,
    int size,
    unsigned short *red,
    unsigned short *green,
    unsigned short *blue
)
{
    int length = (size + 1) & ~1;
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeSetGammaRampReq *req;

    XF86VidModeCheckExtension (dpy, info, False);
    LockDisplay(dpy);
    GetReq(XF86VidModeSetGammaRamp, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeSetGammaRamp;
    req->screen = screen;
    req->length += (length >> 1) * 3;
    req->size = size;
    _XSend(dpy, (char*)red, size * 2);
    _XSend(dpy, (char*)green, size * 2);
    _XSend(dpy, (char*)blue, size * 2);
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}


Bool
SDL_NAME(XF86VidModeGetGammaRamp) (
    Display *dpy,
    int screen,
    int size,
    unsigned short *red,
    unsigned short *green,
    unsigned short *blue
)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaRampReq *req;
    xXF86VidModeGetGammaRampReply rep;
  
    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGammaRamp, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGammaRamp;
    req->screen = screen;
    req->size = size;
    if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
        UnlockDisplay (dpy);
        SyncHandle ();
        return False;
    }
    if(rep.size) {
	_XRead(dpy, (char*)red, rep.size << 1);
	_XRead(dpy, (char*)green, rep.size << 1);
	_XRead(dpy, (char*)blue, rep.size << 1);
    }

    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}

Bool SDL_NAME(XF86VidModeGetGammaRampSize)(
    Display *dpy,
    int screen,
    int *size
)
{
    XExtDisplayInfo *info = find_display (dpy);
    xXF86VidModeGetGammaRampSizeReq *req;
    xXF86VidModeGetGammaRampSizeReply rep;
  
    *size = 0;

    XF86VidModeCheckExtension (dpy, info, False);

    LockDisplay(dpy);
    GetReq(XF86VidModeGetGammaRampSize, req);
    req->reqType = info->codes->major_opcode;
    req->xf86vidmodeReqType = X_XF86VidModeGetGammaRampSize;
    req->screen = screen;
    if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
        UnlockDisplay (dpy);
        SyncHandle ();
        return False; 
    }
    *size = rep.size;
    UnlockDisplay(dpy);
    SyncHandle();
    return True;
}