R6.6 is the Xorg base-lineXORG-MAIN

1 files changed, 678 insertions, 0 deletions

diff --git a/dix/main.c b/dix/main.c
new file mode 100644
index 000000000..5b50ea94f
--- /dev/null
+++ b/dix/main.c
@@ -0,0 +1,678 @@
+/***********************************************************
+
+Copyright 1987, 1998  The Open Group
+
+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.
+
+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 THE
+OPEN GROUP 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 The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+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 Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL 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.
+
+******************************************************************/
+/* $Xorg: main.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */
+
+#include "X.h"
+#include "Xos.h"   /* for unistd.h  */
+#include "Xproto.h"
+#include "scrnintstr.h"
+#include "misc.h"
+#include "os.h"
+#include "windowstr.h"
+#include "resource.h"
+#include "dixstruct.h"
+#include "gcstruct.h"
+#include "extension.h"
+#include "colormap.h"
+#include "colormapst.h"
+#include "cursorstr.h"
+#include "font.h"
+#include "opaque.h"
+#include "servermd.h"
+#include "site.h"
+#include "dixfont.h"
+
+extern CARD32 defaultScreenSaverTime;
+extern CARD32 defaultScreenSaverInterval;
+extern int defaultScreenSaverBlanking;
+extern int defaultScreenSaverAllowExposures;
+
+#ifdef DPMSExtension
+#include "dpms.h"
+extern BOOL DPMSCapableFlag;
+extern BOOL DPMSEnabled;
+#endif
+
+void ddxGiveUp();
+
+extern int InitClientPrivates(
+#if NeedFunctionPrototypes
+    ClientPtr /*client*/
+#endif
+);
+
+extern void Dispatch(
+#if NeedFunctionPrototypes
+    void
+#endif
+);
+
+extern char *display;
+char *ConnectionInfo;
+xConnSetupPrefix connSetupPrefix;
+
+extern WindowPtr *WindowTable;
+extern FontPtr defaultFont;
+extern int screenPrivateCount;
+
+extern void InitProcVectors();
+extern void InitEvents();
+extern void DefineInitialRootWindow();
+extern Bool CreateGCperDepthArray();
+
+static Bool CreateConnectionBlock(
+#if NeedFunctionPrototypes
+    void
+#endif
+);
+
+static void FreeScreen(
+#if NeedFunctionPrototypes
+    ScreenPtr /*pScreen*/
+#endif
+);
+
+PaddingInfo PixmapWidthPaddingInfo[33];
+
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+/* add padding info for 32-bit interface. PutImage and GetImage will
+ * work on 32-bit padding while the rest of the server will work
+ * on 64-bit padding (Alpha).
+ */
+PaddingInfo PixmapWidthPaddingInfoProto[33];
+#endif
+
+int connBlockScreenStart;
+
+static int restart = 0;
+
+void
+NotImplemented()
+{
+    FatalError("Not implemented");
+}
+
+/*
+ * This array encodes the answer to the question "what is the log base 2
+ * of the number of pixels that fit in a scanline pad unit?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int answer[6][4] = {
+	/* pad   pad   pad     pad*/
+	/*  8     16    32    64 */
+
+	{   3,     4,    5 ,   6 },	/* 1 bit per pixel */
+	{   1,     2,    3 ,   4 },	/* 4 bits per pixel */
+	{   0,     1,    2 ,   3 },	/* 8 bits per pixel */
+	{   ~0,    0,    1 ,   2 },	/* 16 bits per pixel */
+	{   ~0,    ~0,   0 ,   1 },	/* 24 bits per pixel */
+	{   ~0,    ~0,   0 ,   1 }	/* 32 bits per pixel */
+};
+
+/*
+ * This array gives the answer to the question "what is the first index for
+ * the answer array above given the number of bits per pixel?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int indexForBitsPerPixel[ 33 ] = {
+	~0, 0, ~0, ~0,	/* 1 bit per pixel */
+	1, ~0, ~0, ~0,	/* 4 bits per pixel */
+	2, ~0, ~0, ~0,	/* 8 bits per pixel */
+	~0,~0, ~0, ~0,
+	3, ~0, ~0, ~0,	/* 16 bits per pixel */
+	~0,~0, ~0, ~0,
+	4, ~0, ~0, ~0,	/* 24 bits per pixel */
+	~0,~0, ~0, ~0,
+	5		/* 32 bits per pixel */
+};
+
+/*
+ * This array gives the answer to the question "what is the second index for
+ * the answer array above given the number of bits per scanline pad unit?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int indexForScanlinePad[ 65 ] = {
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	 0, ~0, ~0, ~0,	/* 8 bits per scanline pad unit */
+	~0, ~0, ~0, ~0,
+	 1, ~0, ~0, ~0,	/* 16 bits per scanline pad unit */
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	 2, ~0, ~0, ~0,	/* 32 bits per scanline pad unit */
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	~0, ~0, ~0, ~0,
+	 3		/* 64 bits per scanline pad unit */
+};
+
+#ifndef MIN
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+int
+main(argc, argv)
+    int		argc;
+    char	*argv[];
+{
+    int		i, j, k;
+    HWEventQueueType	alwaysCheckForInput[2];
+
+    /* Notice if we're restart.  Probably this is because we jumped through
+     * uninitialized pointer */
+    if (restart)
+	FatalError("server restarted. Jumped through uninitialized pointer?\n");
+    else
+	restart = 1;
+
+#ifdef COMMANDLINE_CHALLENGED_OPERATING_SYSTEMS
+    ExpandCommandLine(&argc, &argv);
+#endif
+
+#ifdef _SC_OPEN_MAX
+    /* if sysconf(_SC_OPEN_MAX) is supported, at runtime MaxClients will be
+     * reassigned instead of using MAXSOCKS */
+    if (MaxClients == 0)
+        MaxClients = MIN(MAXCLIENTS, sysconf(_SC_OPEN_MAX));
+#endif
+
+    /* These are needed by some routines which are called from interrupt
+     * handlers, thus have no direct calling path back to main and thus
+     * can't be passed argc, argv as parameters */
+    argcGlobal = argc;
+    argvGlobal = argv;
+    display = "0";
+    ProcessCommandLine(argc, argv);
+
+    alwaysCheckForInput[0] = 0;
+    alwaysCheckForInput[1] = 1;
+    while(1)
+    {
+	serverGeneration++;
+        ScreenSaverTime = defaultScreenSaverTime;
+	ScreenSaverInterval = defaultScreenSaverInterval;
+	ScreenSaverBlanking = defaultScreenSaverBlanking;
+	ScreenSaverAllowExposures = defaultScreenSaverAllowExposures;
+	InitBlockAndWakeupHandlers();
+	/* Perform any operating system dependent initializations you'd like */
+	OsInit();		
+	if(serverGeneration == 1)
+	{
+	    CreateWellKnownSockets();
+	    InitProcVectors();
+	    clients = (ClientPtr *)xalloc(MAXCLIENTS * sizeof(ClientPtr));
+	    if (!clients)
+		FatalError("couldn't create client array");
+	    for (i=1; i<MAXCLIENTS; i++) 
+		clients[i] = NullClient;
+	    serverClient = (ClientPtr)xalloc(sizeof(ClientRec));
+	    if (!serverClient)
+		FatalError("couldn't create server client");
+	    InitClient(serverClient, 0, (pointer)NULL);
+	}
+	else
+	    ResetWellKnownSockets ();
+        clients[0] = serverClient;
+        currentMaxClients = 1;
+
+	if (!InitClientResources(serverClient))      /* for root resources */
+	    FatalError("couldn't init server resources");
+
+	SetInputCheck(&alwaysCheckForInput[0], &alwaysCheckForInput[1]);
+	screenInfo.arraySize = MAXSCREENS;
+	screenInfo.numScreens = 0;
+	screenInfo.numVideoScreens = -1;
+	WindowTable = (WindowPtr *)xalloc(MAXSCREENS * sizeof(WindowPtr));
+	if (!WindowTable)
+	    FatalError("couldn't create root window table");
+
+	/*
+	 * Just in case the ddx doesnt supply a format for depth 1 (like qvss).
+	 */
+	j = indexForBitsPerPixel[ 1 ];
+	k = indexForScanlinePad[ BITMAP_SCANLINE_PAD ];
+	PixmapWidthPaddingInfo[1].padRoundUp = BITMAP_SCANLINE_PAD-1;
+	PixmapWidthPaddingInfo[1].padPixelsLog2 = answer[j][k];
+ 	j = indexForBitsPerPixel[8]; /* bits per byte */
+ 	PixmapWidthPaddingInfo[1].padBytesLog2 = answer[j][k];
+
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+	/* Fake out protocol interface to make them believe we support
+	 * a different padding than the actual internal padding.
+	 */
+	j = indexForBitsPerPixel[ 1 ];
+	k = indexForScanlinePad[ BITMAP_SCANLINE_PAD_PROTO ];
+	PixmapWidthPaddingInfoProto[1].padRoundUp = BITMAP_SCANLINE_PAD_PROTO-1;
+	PixmapWidthPaddingInfoProto[1].padPixelsLog2 = answer[j][k];
+ 	j = indexForBitsPerPixel[8]; /* bits per byte */
+ 	PixmapWidthPaddingInfoProto[1].padBytesLog2 = answer[j][k];
+#endif /* INTERNAL_VS_EXTERNAL_PADDING */
+
+	InitAtoms();
+	InitEvents();
+	InitGlyphCaching();
+	ResetClientPrivates();
+	ResetScreenPrivates();
+	ResetWindowPrivates();
+	ResetGCPrivates();
+#ifdef PIXPRIV
+	ResetPixmapPrivates();
+#endif
+	ResetColormapPrivates();
+	ResetFontPrivateIndex();
+	InitCallbackManager();
+	InitOutput(&screenInfo, argc, argv);
+	if (screenInfo.numScreens < 1)
+	    FatalError("no screens found");
+	if (screenInfo.numVideoScreens < 0)
+	    screenInfo.numVideoScreens = screenInfo.numScreens;
+#ifdef XPRINT
+	PrinterInitOutput(&screenInfo, argc, argv);
+#endif
+	InitExtensions(argc, argv);
+	if (!InitClientPrivates(serverClient))
+	    FatalError("failed to allocate serverClient devprivates");
+	for (i = 0; i < screenInfo.numScreens; i++)
+	{
+	    ScreenPtr pScreen = screenInfo.screens[i];
+	    if (!CreateScratchPixmapsForScreen(i))
+		FatalError("failed to create scratch pixmaps");
+	    if (pScreen->CreateScreenResources &&
+		!(*pScreen->CreateScreenResources)(pScreen))
+		FatalError("failed to create screen resources");
+	    if (!CreateGCperDepth(i))
+		FatalError("failed to create scratch GCs");
+	    if (!CreateDefaultStipple(i))
+		FatalError("failed to create default stipple");
+	    if (!CreateRootWindow(pScreen))
+		FatalError("failed to create root window");
+	}
+	InitInput(argc, argv);
+	if (InitAndStartDevices() != Success)
+	    FatalError("failed to initialize core devices");
+
+	InitFonts();
+	if (SetDefaultFontPath(defaultFontPath) != Success)
+	    ErrorF("failed to set default font path '%s'", defaultFontPath);
+	if (!SetDefaultFont(defaultTextFont))
+	    FatalError("could not open default font '%s'", defaultTextFont);
+	if (!(rootCursor = CreateRootCursor(defaultCursorFont, 0)))
+	    FatalError("could not open default cursor font '%s'",
+		       defaultCursorFont);
+#ifdef DPMSExtension
+ 	/* check all screens, looking for DPMS Capabilities */
+ 	DPMSCapableFlag = DPMSSupported();
+	if (!DPMSCapableFlag)
+     	    DPMSEnabled = FALSE;
+#endif
+	for (i = 0; i < screenInfo.numScreens; i++)
+	    InitRootWindow(WindowTable[i]);
+        DefineInitialRootWindow(WindowTable[0]);
+
+	if (!CreateConnectionBlock())
+	    FatalError("could not create connection block info");
+
+	Dispatch();
+
+	/* Now free up whatever must be freed */
+	if (screenIsSaved == SCREEN_SAVER_ON)
+	    SaveScreens(SCREEN_SAVER_OFF, ScreenSaverReset);
+	CloseDownExtensions();
+	FreeAllResources();
+	CloseDownDevices();
+	for (i = screenInfo.numScreens - 1; i >= 0; i--)
+	{
+	    FreeScratchPixmapsForScreen(i);
+	    FreeGCperDepth(i);
+	    FreeDefaultStipple(i);
+	    (* screenInfo.screens[i]->CloseScreen)(i, screenInfo.screens[i]);
+	    FreeScreen(screenInfo.screens[i]);
+	    screenInfo.numScreens = i;
+	}
+	xfree(WindowTable);
+	FreeFonts ();
+	xfree(serverClient->devPrivates);
+
+	if (dispatchException & DE_TERMINATE)
+	{
+	    ddxGiveUp();
+	    break;
+	}
+
+	xfree(ConnectionInfo);
+    }
+    return(0);
+}
+
+static int padlength[4] = {0, 3, 2, 1};
+
+static Bool
+CreateConnectionBlock()
+{
+    xConnSetup setup;
+    xWindowRoot root;
+    xDepth	depth;
+    xVisualType visual;
+    xPixmapFormat format;
+    unsigned long vid;
+    int i, j, k,
+        lenofblock,
+        sizesofar = 0;
+    char *pBuf;
+
+    
+    /* Leave off the ridBase and ridMask, these must be sent with 
+       connection */
+
+    setup.release = VENDOR_RELEASE;
+    /*
+     * per-server image and bitmap parameters are defined in Xmd.h
+     */
+    setup.imageByteOrder = screenInfo.imageByteOrder;
+
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+    if ( screenInfo.bitmapScanlineUnit > 32 )
+    	setup.bitmapScanlineUnit  = 32;
+    else
+#endif 
+    	setup.bitmapScanlineUnit  = screenInfo.bitmapScanlineUnit;
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+    if ( screenInfo.bitmapScanlinePad > 32 )
+    	setup.bitmapScanlinePad = 32;
+    else
+#endif 
+	setup.bitmapScanlinePad = screenInfo.bitmapScanlinePad;
+
+    setup.bitmapBitOrder = screenInfo.bitmapBitOrder;
+    setup.motionBufferSize = NumMotionEvents();
+    setup.numRoots = screenInfo.numScreens;
+    setup.nbytesVendor = strlen(VENDOR_STRING); 
+    setup.numFormats = screenInfo.numPixmapFormats;
+    setup.maxRequestSize = MAX_REQUEST_SIZE;
+    QueryMinMaxKeyCodes(&setup.minKeyCode, &setup.maxKeyCode);
+    
+    lenofblock = sizeof(xConnSetup) + 
+            ((setup.nbytesVendor + 3) & ~3) +
+	    (setup.numFormats * sizeof(xPixmapFormat)) +
+            (setup.numRoots * sizeof(xWindowRoot));
+    ConnectionInfo = (char *) xalloc(lenofblock);
+    if (!ConnectionInfo)
+	return FALSE;
+
+    memmove(ConnectionInfo, (char *)&setup, sizeof(xConnSetup));
+    sizesofar = sizeof(xConnSetup);
+    pBuf = ConnectionInfo + sizeof(xConnSetup);
+
+    memmove(pBuf, VENDOR_STRING, (int)setup.nbytesVendor);
+    sizesofar += setup.nbytesVendor;
+    pBuf += setup.nbytesVendor;
+    i = padlength[setup.nbytesVendor & 3];
+    sizesofar += i;
+    while (--i >= 0)
+        *pBuf++ = 0;
+    
+    for (i=0; i<screenInfo.numPixmapFormats; i++)
+    {
+	format.depth = screenInfo.formats[i].depth;
+	format.bitsPerPixel = screenInfo.formats[i].bitsPerPixel;
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+	if ( screenInfo.formats[i].scanlinePad > 32 )
+	    format.scanLinePad = 32;
+	else
+#endif
+	    format.scanLinePad = screenInfo.formats[i].scanlinePad;
+	memmove(pBuf, (char *)&format, sizeof(xPixmapFormat));
+	pBuf += sizeof(xPixmapFormat);
+	sizesofar += sizeof(xPixmapFormat);
+    }
+
+    connBlockScreenStart = sizesofar;
+    for (i=0; i<screenInfo.numScreens; i++) 
+    {
+	ScreenPtr	pScreen;
+	DepthPtr	pDepth;
+	VisualPtr	pVisual;
+
+	pScreen = screenInfo.screens[i];
+	root.windowId = WindowTable[i]->drawable.id;
+	root.defaultColormap = pScreen->defColormap;
+	root.whitePixel = pScreen->whitePixel;
+	root.blackPixel = pScreen->blackPixel;
+	root.currentInputMask = 0;    /* filled in when sent */
+	root.pixWidth = pScreen->width;
+	root.pixHeight = pScreen->height;
+	root.mmWidth = pScreen->mmWidth;
+	root.mmHeight = pScreen->mmHeight;
+	root.minInstalledMaps = pScreen->minInstalledCmaps;
+	root.maxInstalledMaps = pScreen->maxInstalledCmaps; 
+	root.rootVisualID = pScreen->rootVisual;		
+	root.backingStore = pScreen->backingStoreSupport;
+	root.saveUnders = pScreen->saveUnderSupport != NotUseful;
+	root.rootDepth = pScreen->rootDepth;
+	root.nDepths = pScreen->numDepths;
+	memmove(pBuf, (char *)&root, sizeof(xWindowRoot));
+	sizesofar += sizeof(xWindowRoot);
+	pBuf += sizeof(xWindowRoot);
+
+	pDepth = pScreen->allowedDepths;
+	for(j = 0; j < pScreen->numDepths; j++, pDepth++)
+	{
+	    lenofblock += sizeof(xDepth) + 
+		    (pDepth->numVids * sizeof(xVisualType));
+	    pBuf = (char *)xrealloc(ConnectionInfo, lenofblock);
+	    if (!pBuf)
+	    {
+		xfree(ConnectionInfo);
+		return FALSE;
+	    }
+	    ConnectionInfo = pBuf;
+	    pBuf += sizesofar;            
+	    depth.depth = pDepth->depth;
+	    depth.nVisuals = pDepth->numVids;
+	    memmove(pBuf, (char *)&depth, sizeof(xDepth));
+	    pBuf += sizeof(xDepth);
+	    sizesofar += sizeof(xDepth);
+	    for(k = 0; k < pDepth->numVids; k++)
+	    {
+		vid = pDepth->vids[k];
+		for (pVisual = pScreen->visuals;
+		     pVisual->vid != vid;
+		     pVisual++)
+		    ;
+		visual.visualID = vid;
+		visual.class = pVisual->class;
+		visual.bitsPerRGB = pVisual->bitsPerRGBValue;
+		visual.colormapEntries = pVisual->ColormapEntries;
+		visual.redMask = pVisual->redMask;
+		visual.greenMask = pVisual->greenMask;
+		visual.blueMask = pVisual->blueMask;
+		memmove(pBuf, (char *)&visual, sizeof(xVisualType));
+		pBuf += sizeof(xVisualType);
+		sizesofar += sizeof(xVisualType);
+	    }
+	}
+    }
+    connSetupPrefix.success = xTrue;
+    connSetupPrefix.length = lenofblock/4;
+    connSetupPrefix.majorVersion = X_PROTOCOL;
+    connSetupPrefix.minorVersion = X_PROTOCOL_REVISION;
+    return TRUE;
+}
+
+/*
+	grow the array of screenRecs if necessary.
+	call the device-supplied initialization procedure 
+with its screen number, a pointer to its ScreenRec, argc, and argv.
+	return the number of successfully installed screens.
+
+*/
+
+int
+AddScreen(pfnInit, argc, argv)
+    Bool	(* pfnInit)();
+    int argc;
+    char **argv;
+{
+
+    int i;
+    int scanlinepad, format, depth, bitsPerPixel, j, k;
+    ScreenPtr pScreen;
+#ifdef DEBUG
+    void	(**jNI) ();
+#endif /* DEBUG */
+
+    i = screenInfo.numScreens;
+    if (i == MAXSCREENS)
+	return -1;
+
+    pScreen = (ScreenPtr) xalloc(sizeof(ScreenRec));
+    if (!pScreen)
+	return -1;
+
+    pScreen->devPrivates = (DevUnion *)xalloc(screenPrivateCount *
+					      sizeof(DevUnion));
+    if (!pScreen->devPrivates && screenPrivateCount)
+    {
+	xfree(pScreen);
+	return -1;
+    }
+    pScreen->myNum = i;
+    pScreen->WindowPrivateLen = 0;
+    pScreen->WindowPrivateSizes = (unsigned *)NULL;
+    pScreen->totalWindowSize = sizeof(WindowRec);
+    pScreen->GCPrivateLen = 0;
+    pScreen->GCPrivateSizes = (unsigned *)NULL;
+    pScreen->totalGCSize = sizeof(GC);
+#ifdef PIXPRIV
+    pScreen->PixmapPrivateLen = 0;
+    pScreen->PixmapPrivateSizes = (unsigned *)NULL;
+    pScreen->totalPixmapSize = sizeof(PixmapRec);
+#endif
+    pScreen->ClipNotify = (void (*)())NULL; /* for R4 ddx compatibility */
+    pScreen->CreateScreenResources = (Bool (*)())NULL;
+    
+#ifdef DEBUG
+    for (jNI = &pScreen->QueryBestSize; 
+	 jNI < (void (**) ()) &pScreen->SendGraphicsExpose;
+	 jNI++)
+	*jNI = NotImplemented;
+#endif /* DEBUG */
+
+    /*
+     * This loop gets run once for every Screen that gets added,
+     * but thats ok.  If the ddx layer initializes the formats
+     * one at a time calling AddScreen() after each, then each
+     * iteration will make it a little more accurate.  Worst case
+     * we do this loop N * numPixmapFormats where N is # of screens.
+     * Anyway, this must be called after InitOutput and before the
+     * screen init routine is called.
+     */
+    for (format=0; format<screenInfo.numPixmapFormats; format++)
+    {
+ 	depth = screenInfo.formats[format].depth;
+ 	bitsPerPixel = screenInfo.formats[format].bitsPerPixel;
+  	scanlinepad = screenInfo.formats[format].scanlinePad;
+ 	j = indexForBitsPerPixel[ bitsPerPixel ];
+  	k = indexForScanlinePad[ scanlinepad ];
+ 	PixmapWidthPaddingInfo[ depth ].padPixelsLog2 = answer[j][k];
+ 	PixmapWidthPaddingInfo[ depth ].padRoundUp =
+ 	    (scanlinepad/bitsPerPixel) - 1;
+ 	j = indexForBitsPerPixel[ 8 ]; /* bits per byte */
+ 	PixmapWidthPaddingInfo[ depth ].padBytesLog2 = answer[j][k];
+
+#ifdef INTERNAL_VS_EXTERNAL_PADDING
+	/* Fake out protocol interface to make them believe we support
+	 * a different padding than the actual internal padding.
+	 */
+ 	j = indexForBitsPerPixel[ bitsPerPixel ];
+  	k = indexForScanlinePad[ BITMAP_SCANLINE_PAD_PROTO ];
+ 	PixmapWidthPaddingInfoProto[ depth ].padPixelsLog2 = answer[j][k];
+ 	PixmapWidthPaddingInfoProto[ depth ].padRoundUp =
+ 	    (BITMAP_SCANLINE_PAD_PROTO/bitsPerPixel) - 1;
+ 	j = indexForBitsPerPixel[ 8 ]; /* bits per byte */
+ 	PixmapWidthPaddingInfoProto[ depth ].padBytesLog2 = answer[j][k];
+#endif /* INTERNAL_VS_EXTERNAL_PADDING */
+    }
+  
+    /* This is where screen specific stuff gets initialized.  Load the
+       screen structure, call the hardware, whatever.
+       This is also where the default colormap should be allocated and
+       also pixel values for blackPixel, whitePixel, and the cursor
+       Note that InitScreen is NOT allowed to modify argc, argv, or
+       any of the strings pointed to by argv.  They may be passed to
+       multiple screens. 
+    */ 
+    pScreen->rgf = ~0L;  /* there are no scratch GCs yet*/
+    WindowTable[i] = NullWindow;
+    screenInfo.screens[i] = pScreen;
+    screenInfo.numScreens++;
+    if (!(*pfnInit)(i, pScreen, argc, argv))
+    {
+	FreeScreen(pScreen);
+	screenInfo.numScreens--;
+	return -1;
+    }
+    return i;
+}
+
+static void
+FreeScreen(pScreen)
+    ScreenPtr pScreen;
+{
+    xfree(pScreen->WindowPrivateSizes);
+    xfree(pScreen->GCPrivateSizes);
+#ifdef PIXPRIV
+    xfree(pScreen->PixmapPrivateSizes);
+#endif
+    xfree(pScreen->devPrivates);
+    xfree(pScreen);
+}