xref: /xsrc/external/mit/xorg-server/dist/Xext/panoramiX.c

/*****************************************************************
Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
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.

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
DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL 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 Digital Equipment Corporation
shall not be used in advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization from Digital
Equipment Corporation.
******************************************************************/

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#define NEED_REPLIES
#include <stdio.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <X11/Xarch.h>
#include "misc.h"
#include "cursor.h"
#include "cursorstr.h"
#include "extnsionst.h"
#include "dixstruct.h"
#include "gc.h"
#include "gcstruct.h"
#include "scrnintstr.h"
#include "window.h"
#include "windowstr.h"
#include "pixmapstr.h"
#include "panoramiX.h"
#include <X11/extensions/panoramiXproto.h>
#include "panoramiXsrv.h"
#include "globals.h"
#include "servermd.h"
#include "resource.h"
#ifdef RENDER
#include "picturestr.h"
#endif
#include "modinit.h"

#define SERVER_PANORAMIX_MAJOR_VERSION	1
#define SERVER_PANORAMIX_MINOR_VERSION	1

#ifdef GLXPROXY
extern VisualPtr glxMatchVisual(ScreenPtr pScreen,
				VisualPtr pVisual,
				ScreenPtr pMatchScreen);
#endif

/*
 *	PanoramiX data declarations
 */

int 		PanoramiXPixWidth = 0;
int 		PanoramiXPixHeight = 0;
_X_EXPORT int 	PanoramiXNumScreens = 0;

_X_EXPORT PanoramiXData *panoramiXdataPtr = NULL;
static RegionRec   	PanoramiXScreenRegion = {{0, 0, 0, 0}, NULL};

static int		PanoramiXNumDepths;
static DepthPtr		PanoramiXDepths;
static int		PanoramiXNumVisuals;
static VisualPtr	PanoramiXVisuals;

_X_EXPORT unsigned long XRC_DRAWABLE;
_X_EXPORT unsigned long XRT_WINDOW;
_X_EXPORT unsigned long XRT_PIXMAP;
_X_EXPORT unsigned long XRT_GC;
_X_EXPORT unsigned long XRT_COLORMAP;

static Bool VisualsEqual(VisualPtr, ScreenPtr, VisualPtr);
_X_EXPORT XineramaVisualsEqualProcPtr XineramaVisualsEqualPtr = &VisualsEqual;

/*
 *	Function prototypes
 */

static int panoramiXGeneration;
static int ProcPanoramiXDispatch(ClientPtr client);

static void PanoramiXResetProc(ExtensionEntry*);

/*
 *	External references for functions and data variables
 */

#include "panoramiXh.h"

int (* SavedProcVector[256]) (ClientPtr client) = { NULL, };

static int PanoramiXGCKeyIndex;
static DevPrivateKey PanoramiXGCKey = &PanoramiXGCKeyIndex;
static int PanoramiXScreenKeyIndex;
static DevPrivateKey PanoramiXScreenKey = &PanoramiXScreenKeyIndex;

typedef struct {
  DDXPointRec clipOrg;
  DDXPointRec patOrg;
  GCFuncs *wrapFuncs;
} PanoramiXGCRec, *PanoramiXGCPtr;

typedef struct {
  CreateGCProcPtr	CreateGC;
  CloseScreenProcPtr	CloseScreen;
} PanoramiXScreenRec, *PanoramiXScreenPtr;

RegionRec XineramaScreenRegions[MAXSCREENS];

static void XineramaValidateGC(GCPtr, unsigned long, DrawablePtr);
static void XineramaChangeGC(GCPtr, unsigned long);
static void XineramaCopyGC(GCPtr, unsigned long, GCPtr);
static void XineramaDestroyGC(GCPtr);
static void XineramaChangeClip(GCPtr, int, pointer, int);
static void XineramaDestroyClip(GCPtr);
static void XineramaCopyClip(GCPtr, GCPtr);

static GCFuncs XineramaGCFuncs = {
    XineramaValidateGC, XineramaChangeGC, XineramaCopyGC, XineramaDestroyGC,
    XineramaChangeClip, XineramaDestroyClip, XineramaCopyClip
};

#define Xinerama_GC_FUNC_PROLOGUE(pGC)\
    PanoramiXGCPtr  pGCPriv = (PanoramiXGCPtr) \
	dixLookupPrivate(&(pGC)->devPrivates, PanoramiXGCKey); \
    (pGC)->funcs = pGCPriv->wrapFuncs;

#define Xinerama_GC_FUNC_EPILOGUE(pGC)\
    pGCPriv->wrapFuncs = (pGC)->funcs;\
    (pGC)->funcs = &XineramaGCFuncs;


static Bool
XineramaCloseScreen (int i, ScreenPtr pScreen)
{
    PanoramiXScreenPtr pScreenPriv = (PanoramiXScreenPtr)
	dixLookupPrivate(&pScreen->devPrivates, PanoramiXScreenKey);

    pScreen->CloseScreen = pScreenPriv->CloseScreen;
    pScreen->CreateGC = pScreenPriv->CreateGC;

    REGION_UNINIT(pScreen, &XineramaScreenRegions[pScreen->myNum]);
    if (pScreen->myNum == 0)
	REGION_UNINIT(pScreen, &PanoramiXScreenRegion);

    xfree ((pointer) pScreenPriv);

    return (*pScreen->CloseScreen) (i, pScreen);
}

static Bool
XineramaCreateGC(GCPtr pGC)
{
    ScreenPtr pScreen = pGC->pScreen;
    PanoramiXScreenPtr pScreenPriv = (PanoramiXScreenPtr)
	dixLookupPrivate(&pScreen->devPrivates, PanoramiXScreenKey);
    Bool ret;

    pScreen->CreateGC = pScreenPriv->CreateGC;
    if((ret = (*pScreen->CreateGC)(pGC))) {
	PanoramiXGCPtr pGCPriv = (PanoramiXGCPtr)
	    dixLookupPrivate(&pGC->devPrivates, PanoramiXGCKey);

	pGCPriv->wrapFuncs = pGC->funcs;
        pGC->funcs = &XineramaGCFuncs;

	pGCPriv->clipOrg.x = pGC->clipOrg.x;
	pGCPriv->clipOrg.y = pGC->clipOrg.y;
	pGCPriv->patOrg.x = pGC->patOrg.x;
	pGCPriv->patOrg.y = pGC->patOrg.y;
    }
    pScreen->CreateGC = XineramaCreateGC;

    return ret;
}

static void
XineramaValidateGC(
   GCPtr         pGC,
   unsigned long changes,
   DrawablePtr   pDraw
){
    Xinerama_GC_FUNC_PROLOGUE (pGC);

    if((pDraw->type == DRAWABLE_WINDOW) && !(((WindowPtr)pDraw)->parent)) {
	/* the root window */
	int x_off = panoramiXdataPtr[pGC->pScreen->myNum].x;
	int y_off = panoramiXdataPtr[pGC->pScreen->myNum].y;
	int new_val;

	new_val = pGCPriv->clipOrg.x - x_off;
	if(pGC->clipOrg.x != new_val) {
	    pGC->clipOrg.x = new_val;
	    changes |= GCClipXOrigin;
	}
	new_val = pGCPriv->clipOrg.y - y_off;
	if(pGC->clipOrg.y != new_val) {
	    pGC->clipOrg.y = new_val;
	    changes |= GCClipYOrigin;
	}
	new_val = pGCPriv->patOrg.x - x_off;
	if(pGC->patOrg.x != new_val) {
	    pGC->patOrg.x = new_val;
	    changes |= GCTileStipXOrigin;
	}
	new_val = pGCPriv->patOrg.y - y_off;
	if(pGC->patOrg.y != new_val) {
	    pGC->patOrg.y = new_val;
	    changes |= GCTileStipYOrigin;
	}
    } else {
	if(pGC->clipOrg.x != pGCPriv->clipOrg.x) {
	    pGC->clipOrg.x = pGCPriv->clipOrg.x;
	    changes |= GCClipXOrigin;
	}
	if(pGC->clipOrg.y != pGCPriv->clipOrg.y) {
	    pGC->clipOrg.y = pGCPriv->clipOrg.y;
	    changes |= GCClipYOrigin;
	}
	if(pGC->patOrg.x != pGCPriv->patOrg.x) {
	    pGC->patOrg.x = pGCPriv->patOrg.x;
	    changes |= GCTileStipXOrigin;
	}
	if(pGC->patOrg.y != pGCPriv->patOrg.y) {
	    pGC->patOrg.y = pGCPriv->patOrg.y;
	    changes |= GCTileStipYOrigin;
	}
    }

    (*pGC->funcs->ValidateGC)(pGC, changes, pDraw);
    Xinerama_GC_FUNC_EPILOGUE (pGC);
}

static void
XineramaDestroyGC(GCPtr pGC)
{
    Xinerama_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->DestroyGC)(pGC);
    Xinerama_GC_FUNC_EPILOGUE (pGC);
}

static void
XineramaChangeGC (
    GCPtr	    pGC,
    unsigned long   mask
){
    Xinerama_GC_FUNC_PROLOGUE (pGC);

    if(mask & GCTileStipXOrigin)
	pGCPriv->patOrg.x = pGC->patOrg.x;
    if(mask & GCTileStipYOrigin)
	pGCPriv->patOrg.y = pGC->patOrg.y;
    if(mask & GCClipXOrigin)
	pGCPriv->clipOrg.x = pGC->clipOrg.x;
    if(mask & GCClipYOrigin)
	pGCPriv->clipOrg.y = pGC->clipOrg.y;

    (*pGC->funcs->ChangeGC) (pGC, mask);
    Xinerama_GC_FUNC_EPILOGUE (pGC);
}

static void
XineramaCopyGC (
    GCPtr	    pGCSrc,
    unsigned long   mask,
    GCPtr	    pGCDst
){
    PanoramiXGCPtr pSrcPriv = (PanoramiXGCPtr)
	dixLookupPrivate(&pGCSrc->devPrivates, PanoramiXGCKey);
    Xinerama_GC_FUNC_PROLOGUE (pGCDst);

    if(mask & GCTileStipXOrigin)
        pGCPriv->patOrg.x = pSrcPriv->patOrg.x;
    if(mask & GCTileStipYOrigin)
        pGCPriv->patOrg.y = pSrcPriv->patOrg.y;
    if(mask & GCClipXOrigin)
        pGCPriv->clipOrg.x = pSrcPriv->clipOrg.x;
    if(mask & GCClipYOrigin)
        pGCPriv->clipOrg.y = pSrcPriv->clipOrg.y;

    (*pGCDst->funcs->CopyGC) (pGCSrc, mask, pGCDst);
    Xinerama_GC_FUNC_EPILOGUE (pGCDst);
}

static void
XineramaChangeClip (
    GCPtr   pGC,
    int		type,
    pointer	pvalue,
    int		nrects
){
    Xinerama_GC_FUNC_PROLOGUE (pGC);
    (*pGC->funcs->ChangeClip) (pGC, type, pvalue, nrects);
    Xinerama_GC_FUNC_EPILOGUE (pGC);
}

static void
XineramaCopyClip(GCPtr pgcDst, GCPtr pgcSrc)
{
    Xinerama_GC_FUNC_PROLOGUE (pgcDst);
    (* pgcDst->funcs->CopyClip)(pgcDst, pgcSrc);
    Xinerama_GC_FUNC_EPILOGUE (pgcDst);
}

static void
XineramaDestroyClip(GCPtr pGC)
{
    Xinerama_GC_FUNC_PROLOGUE (pGC);
    (* pGC->funcs->DestroyClip)(pGC);
    Xinerama_GC_FUNC_EPILOGUE (pGC);
}

_X_EXPORT int
XineramaDeleteResource(pointer data, XID id)
{
    xfree(data);
    return 1;
}

typedef struct {
   int screen;
   int id;
} PanoramiXSearchData;

static Bool
XineramaFindIDByScrnum(pointer resource, XID id, pointer privdata)
{
    PanoramiXRes *res = (PanoramiXRes*)resource;
    PanoramiXSearchData *data = (PanoramiXSearchData*)privdata;

    return (res->info[data->screen].id == data->id);
}

PanoramiXRes *
PanoramiXFindIDByScrnum(RESTYPE type, XID id, int screen)
{
    PanoramiXSearchData data;

    if(!screen)
	return LookupIDByType(id, type);

    data.screen = screen;
    data.id = id;

    return LookupClientResourceComplex(clients[CLIENT_ID(id)], type,
		XineramaFindIDByScrnum, &data);
}

typedef struct _connect_callback_list {
    void (*func)(void);
    struct _connect_callback_list *next;
} XineramaConnectionCallbackList;

static XineramaConnectionCallbackList *ConnectionCallbackList = NULL;

_X_EXPORT Bool
XineramaRegisterConnectionBlockCallback(void (*func)(void))
{
    XineramaConnectionCallbackList *newlist;

    if(!(newlist = xalloc(sizeof(XineramaConnectionCallbackList))))
	return FALSE;

    newlist->next = ConnectionCallbackList;
    newlist->func = func;
    ConnectionCallbackList = newlist;

    return TRUE;
}

static void XineramaInitData(ScreenPtr pScreen)
{
    int i, w, h;

    REGION_NULL(pScreen, &PanoramiXScreenRegion)
    for (i = 0; i < PanoramiXNumScreens; i++) {
	BoxRec TheBox;

        pScreen = screenInfo.screens[i];

	panoramiXdataPtr[i].x = dixScreenOrigins[i].x;
	panoramiXdataPtr[i].y = dixScreenOrigins[i].y;
	panoramiXdataPtr[i].width = pScreen->width;
	panoramiXdataPtr[i].height = pScreen->height;

	TheBox.x1 = panoramiXdataPtr[i].x;
	TheBox.x2 = TheBox.x1 + panoramiXdataPtr[i].width;
	TheBox.y1 = panoramiXdataPtr[i].y;
	TheBox.y2 = TheBox.y1 + panoramiXdataPtr[i].height;

	REGION_INIT(pScreen, &XineramaScreenRegions[i], &TheBox, 1);
	REGION_UNION(pScreen, &PanoramiXScreenRegion, &PanoramiXScreenRegion,
		     &XineramaScreenRegions[i]);
    }

    PanoramiXPixWidth = panoramiXdataPtr[0].x + panoramiXdataPtr[0].width;
    PanoramiXPixHeight = panoramiXdataPtr[0].y + panoramiXdataPtr[0].height;

    for (i = 1; i < PanoramiXNumScreens; i++) {
	w = panoramiXdataPtr[i].x + panoramiXdataPtr[i].width;
	h = panoramiXdataPtr[i].y + panoramiXdataPtr[i].height;

	if (PanoramiXPixWidth < w)
	    PanoramiXPixWidth = w;
	if (PanoramiXPixHeight < h)
	    PanoramiXPixHeight = h;
    }
}

void XineramaReinitData(ScreenPtr pScreen)
{
    int i;

    REGION_UNINIT(pScreen, &PanoramiXScreenRegion);
    for (i = 0; i < PanoramiXNumScreens; i++)
	REGION_UNINIT(pScreen, &XineramaScreenRegions[i]);

    XineramaInitData(pScreen);
}

/*
 *	PanoramiXExtensionInit():
 *		Called from InitExtensions in main().
 *		Register PanoramiXeen Extension
 *		Initialize global variables.
 */

void PanoramiXExtensionInit(int argc, char *argv[])
{
    int 	     	i;
    Bool	     	success = FALSE;
    ExtensionEntry 	*extEntry;
    ScreenPtr		pScreen = screenInfo.screens[0];
    PanoramiXScreenPtr	pScreenPriv;

    if (noPanoramiXExtension)
	return;

    PanoramiXNumScreens = screenInfo.numScreens;
    if (PanoramiXNumScreens == 1) {		/* Only 1 screen 	*/
	noPanoramiXExtension = TRUE;
	return;
    }

    while (panoramiXGeneration != serverGeneration) {
	extEntry = AddExtension(PANORAMIX_PROTOCOL_NAME, 0,0,
				ProcPanoramiXDispatch,
				SProcPanoramiXDispatch, PanoramiXResetProc,
				StandardMinorOpcode);
	if (!extEntry)
	    break;

	/*
	 *	First make sure all the basic allocations succeed.  If not,
	 *	run in non-PanoramiXeen mode.
	 */

	panoramiXdataPtr = (PanoramiXData *)
		xcalloc(PanoramiXNumScreens, sizeof(PanoramiXData));

        BREAK_IF(!panoramiXdataPtr);

	if (!dixRequestPrivate(PanoramiXGCKey, sizeof(PanoramiXGCRec))) {
		noPanoramiXExtension = TRUE;
		return;
	}

	for (i = 0; i < PanoramiXNumScreens; i++) {
	   pScreen = screenInfo.screens[i];
	   pScreenPriv = xalloc(sizeof(PanoramiXScreenRec));
	   dixSetPrivate(&pScreen->devPrivates, PanoramiXScreenKey,
			 pScreenPriv);
	   if(!pScreenPriv) {
		noPanoramiXExtension = TRUE;
		return;
	   }

	   pScreenPriv->CreateGC = pScreen->CreateGC;
	   pScreenPriv->CloseScreen = pScreen->CloseScreen;

	   pScreen->CreateGC = XineramaCreateGC;
	   pScreen->CloseScreen = XineramaCloseScreen;
	}

	XRC_DRAWABLE = CreateNewResourceClass();
	XRT_WINDOW = CreateNewResourceType(XineramaDeleteResource) |
						XRC_DRAWABLE;
	XRT_PIXMAP = CreateNewResourceType(XineramaDeleteResource) |
						XRC_DRAWABLE;
	XRT_GC = CreateNewResourceType(XineramaDeleteResource);
	XRT_COLORMAP = CreateNewResourceType(XineramaDeleteResource);

	panoramiXGeneration = serverGeneration;
	success = TRUE;
    }

    if (!success) {
	noPanoramiXExtension = TRUE;
	ErrorF(PANORAMIX_PROTOCOL_NAME " extension failed to initialize\n");
	return;
    }

    XineramaInitData(pScreen);

    /*
     *	Put our processes into the ProcVector
     */

    for (i = 256; i--; )
	SavedProcVector[i] = ProcVector[i];

    ProcVector[X_CreateWindow] = PanoramiXCreateWindow;
    ProcVector[X_ChangeWindowAttributes] = PanoramiXChangeWindowAttributes;
    ProcVector[X_DestroyWindow] = PanoramiXDestroyWindow;
    ProcVector[X_DestroySubwindows] = PanoramiXDestroySubwindows;
    ProcVector[X_ChangeSaveSet] = PanoramiXChangeSaveSet;
    ProcVector[X_ReparentWindow] = PanoramiXReparentWindow;
    ProcVector[X_MapWindow] = PanoramiXMapWindow;
    ProcVector[X_MapSubwindows] = PanoramiXMapSubwindows;
    ProcVector[X_UnmapWindow] = PanoramiXUnmapWindow;
    ProcVector[X_UnmapSubwindows] = PanoramiXUnmapSubwindows;
    ProcVector[X_ConfigureWindow] = PanoramiXConfigureWindow;
    ProcVector[X_CirculateWindow] = PanoramiXCirculateWindow;
    ProcVector[X_GetGeometry] = PanoramiXGetGeometry;
    ProcVector[X_TranslateCoords] = PanoramiXTranslateCoords;
    ProcVector[X_CreatePixmap] = PanoramiXCreatePixmap;
    ProcVector[X_FreePixmap] = PanoramiXFreePixmap;
    ProcVector[X_CreateGC] = PanoramiXCreateGC;
    ProcVector[X_ChangeGC] = PanoramiXChangeGC;
    ProcVector[X_CopyGC] = PanoramiXCopyGC;
    ProcVector[X_SetDashes] = PanoramiXSetDashes;
    ProcVector[X_SetClipRectangles] = PanoramiXSetClipRectangles;
    ProcVector[X_FreeGC] = PanoramiXFreeGC;
    ProcVector[X_ClearArea] = PanoramiXClearToBackground;
    ProcVector[X_CopyArea] = PanoramiXCopyArea;
    ProcVector[X_CopyPlane] = PanoramiXCopyPlane;
    ProcVector[X_PolyPoint] = PanoramiXPolyPoint;
    ProcVector[X_PolyLine] = PanoramiXPolyLine;
    ProcVector[X_PolySegment] = PanoramiXPolySegment;
    ProcVector[X_PolyRectangle] = PanoramiXPolyRectangle;
    ProcVector[X_PolyArc] = PanoramiXPolyArc;
    ProcVector[X_FillPoly] = PanoramiXFillPoly;
    ProcVector[X_PolyFillRectangle] = PanoramiXPolyFillRectangle;
    ProcVector[X_PolyFillArc] = PanoramiXPolyFillArc;
    ProcVector[X_PutImage] = PanoramiXPutImage;
    ProcVector[X_GetImage] = PanoramiXGetImage;
    ProcVector[X_PolyText8] = PanoramiXPolyText8;
    ProcVector[X_PolyText16] = PanoramiXPolyText16;
    ProcVector[X_ImageText8] = PanoramiXImageText8;
    ProcVector[X_ImageText16] = PanoramiXImageText16;
    ProcVector[X_CreateColormap] = PanoramiXCreateColormap;
    ProcVector[X_FreeColormap] = PanoramiXFreeColormap;
    ProcVector[X_CopyColormapAndFree] = PanoramiXCopyColormapAndFree;
    ProcVector[X_InstallColormap] = PanoramiXInstallColormap;
    ProcVector[X_UninstallColormap] = PanoramiXUninstallColormap;
    ProcVector[X_AllocColor] = PanoramiXAllocColor;
    ProcVector[X_AllocNamedColor] = PanoramiXAllocNamedColor;
    ProcVector[X_AllocColorCells] = PanoramiXAllocColorCells;
    ProcVector[X_AllocColorPlanes] = PanoramiXAllocColorPlanes;
    ProcVector[X_FreeColors] = PanoramiXFreeColors;
    ProcVector[X_StoreColors] = PanoramiXStoreColors;
    ProcVector[X_StoreNamedColor] = PanoramiXStoreNamedColor;

#ifdef RENDER
    PanoramiXRenderInit ();
#endif
}

extern Bool CreateConnectionBlock(void);

Bool PanoramiXCreateConnectionBlock(void)
{
    int i, j, length;
    Bool disableBackingStore = FALSE;
    int old_width, old_height;
    float width_mult, height_mult;
    xWindowRoot *root;
    xVisualType *visual;
    xDepth *depth;
    VisualPtr pVisual;
    ScreenPtr pScreen;

    /*
     *	Do normal CreateConnectionBlock but faking it for only one screen
     */

    if(!PanoramiXNumDepths) {
	ErrorF("Xinerama error: No common visuals\n");
	return FALSE;
    }

    for(i = 1; i < screenInfo.numScreens; i++) {
	pScreen = screenInfo.screens[i];
	if(pScreen->rootDepth != screenInfo.screens[0]->rootDepth) {
	    ErrorF("Xinerama error: Root window depths differ\n");
	    return FALSE;
	}
	if(pScreen->backingStoreSupport != screenInfo.screens[0]->backingStoreSupport)
	     disableBackingStore = TRUE;
    }

    if (disableBackingStore) {
    	for (i = 0; i < screenInfo.numScreens; i++) {
	    pScreen = screenInfo.screens[i];
	    pScreen->backingStoreSupport = NotUseful;
	}
    }

    i = screenInfo.numScreens;
    screenInfo.numScreens = 1;
    if (!CreateConnectionBlock()) {
	screenInfo.numScreens = i;
	return FALSE;
    }

    screenInfo.numScreens = i;

    root = (xWindowRoot *) (ConnectionInfo + connBlockScreenStart);
    length = connBlockScreenStart + sizeof(xWindowRoot);

    /* overwrite the connection block */
    root->nDepths = PanoramiXNumDepths;

    for (i = 0; i < PanoramiXNumDepths; i++) {
	depth = (xDepth *) (ConnectionInfo + length);
	depth->depth = PanoramiXDepths[i].depth;
	depth->nVisuals = PanoramiXDepths[i].numVids;
	length += sizeof(xDepth);
	visual = (xVisualType *)(ConnectionInfo + length);

	for (j = 0; j < depth->nVisuals; j++, visual++) {
	    visual->visualID = PanoramiXDepths[i].vids[j];

	    for (pVisual = PanoramiXVisuals;
		 pVisual->vid != visual->visualID;
		 pVisual++)
	         ;

	    visual->class = pVisual->class;
	    visual->bitsPerRGB = pVisual->bitsPerRGBValue;
	    visual->colormapEntries = pVisual->ColormapEntries;
	    visual->redMask = pVisual->redMask;
	    visual->greenMask = pVisual->greenMask;
	    visual->blueMask = pVisual->blueMask;
	}

	length += (depth->nVisuals * sizeof(xVisualType));
    }

    connSetupPrefix.length = length >> 2;

    for (i = 0; i < PanoramiXNumDepths; i++)
	xfree(PanoramiXDepths[i].vids);
    xfree(PanoramiXDepths);
    PanoramiXDepths = NULL;

    /*
     *  OK, change some dimensions so it looks as if it were one big screen
     */

    old_width = root->pixWidth;
    old_height = root->pixHeight;

    root->pixWidth = PanoramiXPixWidth;
    root->pixHeight = PanoramiXPixHeight;
    width_mult = (1.0 * root->pixWidth) / old_width;
    height_mult = (1.0 * root->pixHeight) / old_height;
    root->mmWidth *= width_mult;
    root->mmHeight *= height_mult;

    while(ConnectionCallbackList) {
	pointer tmp;

	tmp = (pointer)ConnectionCallbackList;
	(*ConnectionCallbackList->func)();
	ConnectionCallbackList = ConnectionCallbackList->next;
	xfree(tmp);
    }

    return TRUE;
}

/*
 * This isn't just memcmp(), bitsPerRGBValue is skipped.  markv made that
 * change way back before xf86 4.0, but the comment for _why_ is a bit
 * opaque, so I'm not going to question it for now.
 *
 * This is probably better done as a screen hook so DBE/EVI/GLX can add
 * their own tests, and adding privates to VisualRec so they don't have to
 * do their own back-mapping.
 */
static Bool
VisualsEqual(VisualPtr a, ScreenPtr pScreenB, VisualPtr b)
{
    return ((a->class == b->class) &&
	(a->ColormapEntries == b->ColormapEntries) &&
	(a->nplanes == b->nplanes) &&
	(a->redMask == b->redMask) &&
	(a->greenMask == b->greenMask) &&
	(a->blueMask == b->blueMask) &&
	(a->offsetRed == b->offsetRed) &&
	(a->offsetGreen == b->offsetGreen) &&
	(a->offsetBlue == b->offsetBlue));
}

static void
PanoramiXMaybeAddDepth(DepthPtr pDepth)
{
    ScreenPtr pScreen;
    int j, k;
    Bool found = FALSE;

    for (j = 1; j < PanoramiXNumScreens; j++) {
	pScreen = screenInfo.screens[j];
	for (k = 0; k < pScreen->numDepths; k++) {
	    if (pScreen->allowedDepths[k].depth == pDepth->depth) {
		found = TRUE;
		break;
	    }
	}
    }

    if (!found)
	return;

    j = PanoramiXNumDepths;
    PanoramiXNumDepths++;
    PanoramiXDepths = xrealloc(PanoramiXDepths,
	    PanoramiXNumDepths * sizeof(DepthRec));
    PanoramiXDepths[j].depth = pDepth->depth;
    PanoramiXDepths[j].numVids = 0;
    /* XXX suboptimal, should grow these dynamically */
    if(pDepth->numVids)
	PanoramiXDepths[j].vids = xalloc(sizeof(VisualID) * pDepth->numVids);
    else
	PanoramiXDepths[j].vids = NULL;
}

static void
PanoramiXMaybeAddVisual(VisualPtr pVisual)
{
    ScreenPtr pScreen;
    int j, k;
    Bool found = FALSE;

    for (j = 1; j < PanoramiXNumScreens; j++) {
	pScreen = screenInfo.screens[j];
	found = FALSE;

	for (k = 0; k < pScreen->numVisuals; k++) {
	    VisualPtr candidate = &pScreen->visuals[k];

	    if ((*XineramaVisualsEqualPtr)(pVisual, pScreen, candidate)
#ifdef GLXPROXY
		&& glxMatchVisual(screenInfo.screens[0], pVisual, pScreen)
#endif
		    ) {
		found = TRUE;
		break;
	    }
	}

	if (!found)
	    return;
    }

    /* found a matching visual on all screens, add it to the subset list */
    j = PanoramiXNumVisuals;
    PanoramiXNumVisuals++;
    PanoramiXVisuals = xrealloc(PanoramiXVisuals,
	    PanoramiXNumVisuals * sizeof(VisualRec));

    memcpy(&PanoramiXVisuals[j], pVisual, sizeof(VisualRec));

    for (k = 0; k < PanoramiXNumDepths; k++) {
	if (PanoramiXDepths[k].depth == pVisual->nplanes) {
	    PanoramiXDepths[k].vids[PanoramiXDepths[k].numVids] = pVisual->vid;
	    PanoramiXDepths[k].numVids++;
	    break;
	}
    }
}

extern void
PanoramiXConsolidate(void)
{
    int 	i;
    PanoramiXRes *root, *defmap, *saver;
    ScreenPtr   pScreen = screenInfo.screens[0];
    DepthPtr    pDepth = pScreen->allowedDepths;
    VisualPtr   pVisual = pScreen->visuals;

    PanoramiXNumDepths = 0;
    PanoramiXNumVisuals = 0;

    for (i = 0; i < pScreen->numDepths; i++)
	PanoramiXMaybeAddDepth(pDepth++);

    for (i = 0; i < pScreen->numVisuals; i++)
	PanoramiXMaybeAddVisual(pVisual++);

    root = xalloc(sizeof(PanoramiXRes));
    root->type = XRT_WINDOW;
    defmap = xalloc(sizeof(PanoramiXRes));
    defmap->type = XRT_COLORMAP;
    saver = xalloc(sizeof(PanoramiXRes));
    saver->type = XRT_WINDOW;

    for (i =  0; i < PanoramiXNumScreens; i++) {
	root->info[i].id = WindowTable[i]->drawable.id;
	root->u.win.class = InputOutput;
        root->u.win.root = TRUE;
        saver->info[i].id = savedScreenInfo[i].wid;
        saver->u.win.class = InputOutput;
        saver->u.win.root = TRUE;
	defmap->info[i].id = (screenInfo.screens[i])->defColormap;
    }

    AddResource(root->info[0].id, XRT_WINDOW, root);
    AddResource(saver->info[0].id, XRT_WINDOW, saver);
    AddResource(defmap->info[0].id, XRT_COLORMAP, defmap);
}

_X_EXPORT VisualID
PanoramiXTranslateVisualID(int screen, VisualID orig)
{
    ScreenPtr pOtherScreen = screenInfo.screens[screen];
    VisualPtr pVisual = NULL;
    int i;

    for (i = 0; i < PanoramiXNumVisuals; i++) {
	if (orig == PanoramiXVisuals[i].vid) {
	    pVisual = &PanoramiXVisuals[i];
	    break;
	}
    }

    if (!pVisual)
	return 0;

    /* if screen is 0, orig is already the correct visual ID */
    if (screen == 0)
	return orig;

    /* found the original, now translate it relative to the backend screen */
    for (i = 0; i < pOtherScreen->numVisuals; i++) {
	VisualPtr pOtherVisual = &pOtherScreen->visuals[i];

	if ((*XineramaVisualsEqualPtr)(pVisual, pOtherScreen, pOtherVisual))
	    return pOtherVisual->vid;
    }

    return 0;
}


/*
 *	PanoramiXResetProc()
 *		Exit, deallocating as needed.
 */

static void PanoramiXResetProc(ExtensionEntry* extEntry)
{
    int		i;

#ifdef RENDER
    PanoramiXRenderReset ();
#endif
    screenInfo.numScreens = PanoramiXNumScreens;
    for (i = 256; i--; )
	ProcVector[i] = SavedProcVector[i];

    Xfree(panoramiXdataPtr);
}


int
ProcPanoramiXQueryVersion (ClientPtr client)
{
    /* REQUEST(xPanoramiXQueryVersionReq); */
    xPanoramiXQueryVersionReply		rep;
    register 	int			n;

    REQUEST_SIZE_MATCH (xPanoramiXQueryVersionReq);
    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
    rep.majorVersion = SERVER_PANORAMIX_MAJOR_VERSION;
    rep.minorVersion = SERVER_PANORAMIX_MINOR_VERSION;
    if (client->swapped) {
        swaps(&rep.sequenceNumber, n);
        swapl(&rep.length, n);
        swaps(&rep.majorVersion, n);
        swaps(&rep.minorVersion, n);
    }
    WriteToClient(client, sizeof (xPanoramiXQueryVersionReply), (char *)&rep);
    return (client->noClientException);
}

int
ProcPanoramiXGetState(ClientPtr client)
{
	REQUEST(xPanoramiXGetStateReq);
    	WindowPtr			pWin;
	xPanoramiXGetStateReply		rep;
	int			n, rc;

	REQUEST_SIZE_MATCH(xPanoramiXGetStateReq);
	rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
	if (rc != Success)
	    return rc;

	rep.type = X_Reply;
	rep.length = 0;
	rep.sequenceNumber = client->sequence;
	rep.state = !noPanoramiXExtension;
	rep.window = stuff->window;
    	if (client->swapped) {
	    swaps (&rep.sequenceNumber, n);
	    swapl (&rep.length, n);
	    swapl (&rep.window, n);
	}
	WriteToClient (client, sizeof (xPanoramiXGetStateReply), (char *) &rep);
	return client->noClientException;

}

int
ProcPanoramiXGetScreenCount(ClientPtr client)
{
	REQUEST(xPanoramiXGetScreenCountReq);
    	WindowPtr			pWin;
	xPanoramiXGetScreenCountReply	rep;
	int			n, rc;

	REQUEST_SIZE_MATCH(xPanoramiXGetScreenCountReq);
	rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
	if (rc != Success)
	    return rc;

	rep.type = X_Reply;
	rep.length = 0;
	rep.sequenceNumber = client->sequence;
	rep.ScreenCount = PanoramiXNumScreens;
	rep.window = stuff->window;
    	if (client->swapped) {
	    swaps (&rep.sequenceNumber, n);
	    swapl (&rep.length, n);
	    swapl (&rep.window, n);
	}
	WriteToClient (client, sizeof (xPanoramiXGetScreenCountReply), (char *) &rep);
	return client->noClientException;
}

int
ProcPanoramiXGetScreenSize(ClientPtr client)
{
	REQUEST(xPanoramiXGetScreenSizeReq);
    	WindowPtr			pWin;
	xPanoramiXGetScreenSizeReply	rep;
	int			n, rc;

	if (stuff->screen >= PanoramiXNumScreens)
	    return BadMatch;

	REQUEST_SIZE_MATCH(xPanoramiXGetScreenSizeReq);
	rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
	if (rc != Success)
	    return rc;

	rep.type = X_Reply;
	rep.length = 0;
	rep.sequenceNumber = client->sequence;
		/* screen dimensions */
	rep.width  = panoramiXdataPtr[stuff->screen].width;
	rep.height = panoramiXdataPtr[stuff->screen].height;
	rep.window = stuff->window;
	rep.screen = stuff->screen;
    	if (client->swapped) {
	    swaps (&rep.sequenceNumber, n);
	    swapl (&rep.length, n);
	    swapl (&rep.width, n);
	    swapl (&rep.height, n);
	    swapl (&rep.window, n);
	    swapl (&rep.screen, n);
	}
	WriteToClient (client, sizeof (xPanoramiXGetScreenSizeReply), (char *) &rep);
	return client->noClientException;
}


int
ProcXineramaIsActive(ClientPtr client)
{
    /* REQUEST(xXineramaIsActiveReq); */
    xXineramaIsActiveReply	rep;

    REQUEST_SIZE_MATCH(xXineramaIsActiveReq);

    rep.type = X_Reply;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;
#if 1
    {
	/* The following hack fools clients into thinking that Xinerama
	 * is disabled even though it is not. */
	rep.state = !noPanoramiXExtension && !PanoramiXExtensionDisabledHack;
    }
#else
    rep.state = !noPanoramiXExtension;
#endif
    if (client->swapped) {
	int n;
	swaps (&rep.sequenceNumber, n);
	swapl (&rep.length, n);
	swapl (&rep.state, n);
    }
    WriteToClient (client, sizeof (xXineramaIsActiveReply), (char *) &rep);
    return client->noClientException;
}


int
ProcXineramaQueryScreens(ClientPtr client)
{
    /* REQUEST(xXineramaQueryScreensReq); */
    xXineramaQueryScreensReply	rep;

    REQUEST_SIZE_MATCH(xXineramaQueryScreensReq);

    rep.type = X_Reply;
    rep.sequenceNumber = client->sequence;
    rep.number = (noPanoramiXExtension) ? 0 : PanoramiXNumScreens;
    rep.length = rep.number * sz_XineramaScreenInfo >> 2;
    if (client->swapped) {
	int n;
	swaps (&rep.sequenceNumber, n);
	swapl (&rep.length, n);
	swapl (&rep.number, n);
    }
    WriteToClient (client, sizeof (xXineramaQueryScreensReply), (char *) &rep);

    if(!noPanoramiXExtension) {
	xXineramaScreenInfo scratch;
	int i;

	for(i = 0; i < PanoramiXNumScreens; i++) {
	    scratch.x_org  = panoramiXdataPtr[i].x;
	    scratch.y_org  = panoramiXdataPtr[i].y;
	    scratch.width  = panoramiXdataPtr[i].width;
	    scratch.height = panoramiXdataPtr[i].height;

	    if(client->swapped) {
		int n;
		swaps (&scratch.x_org, n);
		swaps (&scratch.y_org, n);
		swaps (&scratch.width, n);
		swaps (&scratch.height, n);
	    }
	    WriteToClient (client, sz_XineramaScreenInfo, (char *) &scratch);
	}
    }

    return client->noClientException;
}


static int
ProcPanoramiXDispatch (ClientPtr client)
{   REQUEST(xReq);
    switch (stuff->data)
    {
	case X_PanoramiXQueryVersion:
	     return ProcPanoramiXQueryVersion(client);
	case X_PanoramiXGetState:
	     return ProcPanoramiXGetState(client);
	case X_PanoramiXGetScreenCount:
	     return ProcPanoramiXGetScreenCount(client);
	case X_PanoramiXGetScreenSize:
	     return ProcPanoramiXGetScreenSize(client);
	case X_XineramaIsActive:
	     return ProcXineramaIsActive(client);
	case X_XineramaQueryScreens:
	     return ProcXineramaQueryScreens(client);
    }
    return BadRequest;
}


#if X_BYTE_ORDER == X_LITTLE_ENDIAN
#define SHIFT_L(v,s) (v) << (s)
#define SHIFT_R(v,s) (v) >> (s)
#else
#define SHIFT_L(v,s) (v) >> (s)
#define SHIFT_R(v,s) (v) << (s)
#endif

static void
CopyBits(char *dst, int shiftL, char *src, int bytes)
{
   /* Just get it to work.  Worry about speed later */
    int shiftR = 8 - shiftL;

    while(bytes--) {
	*dst |= SHIFT_L(*src, shiftL);
	*(dst + 1) |= SHIFT_R(*src, shiftR);
	dst++; src++;
    }
}


/* Caution.  This doesn't support 2 and 4 bpp formats.  We expect
   1 bpp and planar data to be already cleared when presented
   to this function */

void
XineramaGetImageData(
    DrawablePtr *pDrawables,
    int left,
    int top,
    int width,
    int height,
    unsigned int format,
    unsigned long planemask,
    char *data,
    int pitch,
    Bool isRoot
){
    RegionRec SrcRegion, GrabRegion;
    BoxRec SrcBox, *pbox;
    int x, y, w, h, i, j, nbox, size, sizeNeeded, ScratchPitch, inOut, depth;
    DrawablePtr pDraw = pDrawables[0];
    char *ScratchMem = NULL;

    size = 0;

    /* find box in logical screen space */
    SrcBox.x1 = left;
    SrcBox.y1 = top;
    if(!isRoot) {
	SrcBox.x1 += pDraw->x + panoramiXdataPtr[0].x;
	SrcBox.y1 += pDraw->y + panoramiXdataPtr[0].y;
    }
    SrcBox.x2 = SrcBox.x1 + width;
    SrcBox.y2 = SrcBox.y1 + height;

    REGION_INIT(pScreen, &SrcRegion, &SrcBox, 1);
    REGION_NULL(pScreen, &GrabRegion);

    depth = (format == XYPixmap) ? 1 : pDraw->depth;

    for(i = 0; i < PanoramiXNumScreens; i++) {
	pDraw = pDrawables[i];

	inOut = RECT_IN_REGION(pScreen,&XineramaScreenRegions[i],&SrcBox);

	if(inOut == rgnIN) {
	    (*pDraw->pScreen->GetImage)(pDraw,
			SrcBox.x1 - pDraw->x - panoramiXdataPtr[i].x,
			SrcBox.y1 - pDraw->y - panoramiXdataPtr[i].y,
			width, height, format, planemask, data);
	    break;
	} else if (inOut == rgnOUT)
	    continue;

	REGION_INTERSECT(pScreen, &GrabRegion, &SrcRegion,
					&XineramaScreenRegions[i]);

	nbox = REGION_NUM_RECTS(&GrabRegion);

	if(nbox) {
	    pbox = REGION_RECTS(&GrabRegion);

	    while(nbox--) {
		w = pbox->x2 - pbox->x1;
		h = pbox->y2 - pbox->y1;
		ScratchPitch = PixmapBytePad(w, depth);
		sizeNeeded = ScratchPitch * h;

		if(sizeNeeded > size) {
		    char *tmpdata = ScratchMem;
		    ScratchMem = xrealloc(ScratchMem, sizeNeeded);
		    if(ScratchMem)
			size = sizeNeeded;
		    else {
			ScratchMem = tmpdata;
			break;
		    }
		}

		x = pbox->x1 - pDraw->x - panoramiXdataPtr[i].x;
		y = pbox->y1 - pDraw->y - panoramiXdataPtr[i].y;

		(*pDraw->pScreen->GetImage)(pDraw, x, y, w, h,
					format, planemask, ScratchMem);

		/* copy the memory over */

		if(depth == 1) {
		   int k, shift, leftover, index, index2;

		   x = pbox->x1 - SrcBox.x1;
		   y = pbox->y1 - SrcBox.y1;
		   shift = x & 7;
		   x >>= 3;
		   leftover = w & 7;
		   w >>= 3;

		   /* clean up the edge */
		   if(leftover) {
			int mask = (1 << leftover) - 1;
			for(j = h, k = w; j--; k += ScratchPitch)
			    ScratchMem[k] &= mask;
		   }

		   for(j = 0, index = (pitch * y) + x, index2 = 0; j < h;
		       j++, index += pitch, index2 += ScratchPitch)
		   {
			if(w) {
			    if(!shift)
				memcpy(data + index, ScratchMem + index2, w);
			    else
				CopyBits(data + index, shift,
						ScratchMem + index2, w);
			}

			if(leftover) {
			    data[index + w] |=
				SHIFT_L(ScratchMem[index2 + w], shift);
			    if((shift + leftover) > 8)
				data[index + w + 1] |=
				  SHIFT_R(ScratchMem[index2 + w],(8 - shift));
			}
		    }
		} else {
		    j = BitsPerPixel(depth) >> 3;
		    x = (pbox->x1 - SrcBox.x1) * j;
		    y = pbox->y1 - SrcBox.y1;
		    w *= j;

		    for(j = 0; j < h; j++) {
			memcpy(data + (pitch * (y + j)) + x,
				ScratchMem + (ScratchPitch * j), w);
		    }
		}
		pbox++;
	    }

	    REGION_SUBTRACT(pScreen, &SrcRegion, &SrcRegion, &GrabRegion);
	    if(!REGION_NOTEMPTY(pScreen, &SrcRegion))
		break;
	}

    }

    if(ScratchMem)
	xfree(ScratchMem);

    REGION_UNINIT(pScreen, &SrcRegion);
    REGION_UNINIT(pScreen, &GrabRegion);
}