miexpose.c

远程桌面连接工具

/***********************************************************

Copyright (c) 1987  X Consortium

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 THE
X CONSORTIUM 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 X Consortium 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 X Consortium.


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.

******************************************************************/

/* $XConsortium: miexpose.c /main/43 1996/08/01 19:25:26 dpw $ */
/* $XFree86: xc/programs/Xserver/mi/miexpose.c,v 3.1 1996/12/23 07:09:44 dawes Exp $ */

#include "X.h"
#define NEED_EVENTS
#include "Xproto.h"
#include "Xprotostr.h"

#include "misc.h"
#include "regionstr.h"
#include "scrnintstr.h"
#include "gcstruct.h"
#include "windowstr.h"
#include "pixmap.h"
#include "input.h"

#include "dixstruct.h"
#include "mi.h"
#include "Xmd.h"

extern WindowPtr *WindowTable;

/*
    machine-independent graphics exposure code.  any device that uses
the region package can call this.
*/

#ifndef RECTLIMIT
#define RECTLIMIT 25		/* pick a number, any number > 8 */
#endif

/* miHandleExposures 
    generate a region for exposures for areas that were copied from obscured or
non-existent areas to non-obscured areas of the destination.  Paint the
background for the region, if the destination is a window.

NOTE:
     this should generally be called, even if graphicsExposures is false,
because this is where bits get recovered from backing store.

NOTE:
     added argument 'plane' is used to indicate how exposures from backing
store should be accomplished. If plane is 0 (i.e. no bit plane), CopyArea
should be used, else a CopyPlane of the indicated plane will be used. The
exposing is done by the backing store's GraphicsExpose function, of course.

*/

RegionPtr
miHandleExposures(pSrcDrawable, pDstDrawable,
		  pGC, srcx, srcy, width, height, dstx, dsty, plane)
    register DrawablePtr	pSrcDrawable;
    register DrawablePtr	pDstDrawable;
    GCPtr 			pGC;
    int 			srcx, srcy;
    int 			width, height;
    int 			dstx, dsty;
    unsigned long		plane;
{
    register ScreenPtr pscr = pGC->pScreen;
    RegionPtr prgnSrcClip;	/* drawable-relative source clip */
    RegionRec rgnSrcRec;
    RegionPtr prgnDstClip;	/* drawable-relative dest clip */
    RegionRec rgnDstRec;
    BoxRec srcBox;		/* unclipped source */
    RegionRec rgnExposed;	/* exposed region, calculated source-
				   relative, made dst relative to
				   intersect with visible parts of
				   dest and send events to client, 
				   and then screen relative to paint 
				   the window background
				*/
    WindowPtr pSrcWin;
    BoxRec expBox;
    Bool extents;

    /* avoid work if we can */
    if (!pGC->graphicsExposures &&
	(pDstDrawable->type == DRAWABLE_PIXMAP) &&
	((pSrcDrawable->type == DRAWABLE_PIXMAP) ||
	 (((WindowPtr)pSrcDrawable)->backStorage == NULL)))
	return NULL;
	
    srcBox.x1 = srcx;
    srcBox.y1 = srcy;
    srcBox.x2 = srcx+width;
    srcBox.y2 = srcy+height;

    if (pSrcDrawable->type != DRAWABLE_PIXMAP)
    {
	BoxRec TsrcBox;

	TsrcBox.x1 = srcx + pSrcDrawable->x;
	TsrcBox.y1 = srcy + pSrcDrawable->y;
	TsrcBox.x2 = TsrcBox.x1 + width;
	TsrcBox.y2 = TsrcBox.y1 + height;
	pSrcWin = (WindowPtr) pSrcDrawable;
	if (pGC->subWindowMode == IncludeInferiors)
 	{
	    prgnSrcClip = NotClippedByChildren (pSrcWin);
	    if ((RECT_IN_REGION(pscr, prgnSrcClip, &TsrcBox)) == rgnIN)
	    {
		REGION_DESTROY(pscr, prgnSrcClip);
		return NULL;
	    }
	}
 	else
 	{
	    if ((RECT_IN_REGION(pscr, &pSrcWin->clipList, &TsrcBox)) == rgnIN)
		return NULL;
	    prgnSrcClip = &rgnSrcRec;
	    REGION_INIT(pscr, prgnSrcClip, NullBox, 0);
	    REGION_COPY(pscr, prgnSrcClip, &pSrcWin->clipList);
	}
	REGION_TRANSLATE(pscr, prgnSrcClip,
				-pSrcDrawable->x, -pSrcDrawable->y);
    }
    else
    {
	BoxRec	box;

	if ((srcBox.x1 >= 0) && (srcBox.y1 >= 0) &&
	    (srcBox.x2 <= pSrcDrawable->width) &&
 	    (srcBox.y2 <= pSrcDrawable->height))
	    return NULL;

	box.x1 = 0;
	box.y1 = 0;
	box.x2 = pSrcDrawable->width;
	box.y2 = pSrcDrawable->height;
	prgnSrcClip = &rgnSrcRec;
	REGION_INIT(pscr, prgnSrcClip, &box, 1);
	pSrcWin = (WindowPtr)NULL;
    }

    if (pDstDrawable == pSrcDrawable)
    {
	prgnDstClip = prgnSrcClip;
    }
    else if (pDstDrawable->type != DRAWABLE_PIXMAP)
    {
	if (pGC->subWindowMode == IncludeInferiors)
	{
	    prgnDstClip = NotClippedByChildren((WindowPtr)pDstDrawable);
	}
	else
	{
	    prgnDstClip = &rgnDstRec;
	    REGION_INIT(pscr, prgnDstClip, NullBox, 0);
	    REGION_COPY(pscr, prgnDstClip,
				&((WindowPtr)pDstDrawable)->clipList);
	}
	REGION_TRANSLATE(pscr, prgnDstClip,
				 -pDstDrawable->x, -pDstDrawable->y);
    }
    else
    {
	BoxRec	box;

	box.x1 = 0;
	box.y1 = 0;
	box.x2 = pDstDrawable->width;
	box.y2 = pDstDrawable->height;
	prgnDstClip = &rgnDstRec;
	REGION_INIT(pscr, prgnDstClip, &box, 1);
    }

    /* drawable-relative source region */
    REGION_INIT(pscr, &rgnExposed, &srcBox, 1);

    /* now get the hidden parts of the source box*/
    REGION_SUBTRACT(pscr, &rgnExposed, &rgnExposed, prgnSrcClip);

    if (pSrcWin && pSrcWin->backStorage)
    {
	/*
	 * Copy any areas from the source backing store. Modifies
	 * rgnExposed.
	 */
	(* pSrcWin->drawable.pScreen->ExposeCopy) ((WindowPtr)pSrcDrawable,
					      pDstDrawable,
					      pGC,
					      &rgnExposed,
					      srcx, srcy,
					      dstx, dsty,
					      plane);
    }
    
    /* move them over the destination */
    REGION_TRANSLATE(pscr, &rgnExposed, dstx-srcx, dsty-srcy);

    /* intersect with visible areas of dest */
    REGION_INTERSECT(pscr, &rgnExposed, &rgnExposed, prgnDstClip);

    /*
     * If we have LOTS of rectangles, we decide to take the extents
     * and force an exposure on that.  This should require much less
     * work overall, on both client and server.  This is cheating, but
     * isn't prohibited by the protocol ("spontaneous combustion" :-)
     * for windows.
     */
    extents = pGC->graphicsExposures &&
	      (REGION_NUM_RECTS(&rgnExposed) > RECTLIMIT) &&
	      (pDstDrawable->type != DRAWABLE_PIXMAP);
#ifdef SHAPE
    if (pSrcWin)
    {
	RegionPtr	region;
    	if (!(region = wClipShape (pSrcWin)))
    	    region = wBoundingShape (pSrcWin);
    	/*
     	 * If you try to CopyArea the extents of a shaped window, compacting the
     	 * exposed region will undo all our work!
     	 */
    	if (extents && pSrcWin && region &&
    	    (RECT_IN_REGION(pscr, region, &srcBox) != rgnIN))
	    	extents = FALSE;
    }
#endif
    if (extents)
    {
	WindowPtr pWin = (WindowPtr)pDstDrawable;

	expBox = *REGION_EXTENTS(pscr, &rgnExposed);
	REGION_RESET(pscr, &rgnExposed, &expBox);
	/* need to clear out new areas of backing store */
	if (pWin->backStorage)
	    (void) (* pWin->drawable.pScreen->ClearBackingStore)(
					 pWin,
					 expBox.x1,
					 expBox.y1,
					 expBox.x2 - expBox.x1,
					 expBox.y2 - expBox.y1,
					 FALSE);
    }
    if ((pDstDrawable->type != DRAWABLE_PIXMAP) &&
	(((WindowPtr)pDstDrawable)->backgroundState != None))
    {
	WindowPtr pWin = (WindowPtr)pDstDrawable;

	/* make the exposed area screen-relative */
	REGION_TRANSLATE(pscr, &rgnExposed, 
				 pDstDrawable->x, pDstDrawable->y);

	if (extents)
	{
	    /* PaintWindowBackground doesn't clip, so we have to */
	    REGION_INTERSECT(pscr, &rgnExposed, &rgnExposed, &pWin->clipList);
	}
	(*pWin->drawable.pScreen->PaintWindowBackground)(
			(WindowPtr)pDstDrawable, &rgnExposed, PW_BACKGROUND);

	if (extents)
	{
	    REGION_RESET(pscr, &rgnExposed, &expBox);
	}
	else
	    REGION_TRANSLATE(pscr, &rgnExposed,
				     -pDstDrawable->x, -pDstDrawable->y);
    }
    if (prgnDstClip == &rgnDstRec)
    {
	REGION_UNINIT(pscr, prgnDstClip);
    }
    else if (prgnDstClip != prgnSrcClip)
    {
	REGION_DESTROY(pscr, prgnDstClip);
    }

    if (prgnSrcClip == &rgnSrcRec)
    {
	REGION_UNINIT(pscr, prgnSrcClip);
    }
    else
    {
	REGION_DESTROY(pscr, prgnSrcClip);
    }

    if (pGC->graphicsExposures)
    {
	/* don't look */
	RegionPtr exposed = REGION_CREATE(pscr, NullBox, 0);
	*exposed = rgnExposed;
	return exposed;
    }
    else
    {
	REGION_UNINIT(pscr, &rgnExposed);
	return NULL;
    }
}

/* send GraphicsExpose events, or a NoExpose event, based on the region */

void
miSendGraphicsExpose (client, pRgn, drawable, major, minor)
    ClientPtr	client;
    RegionPtr	pRgn;
    XID		drawable;
    int	major;
    int	minor;
{
    if (pRgn && !REGION_NIL(pRgn))
    {
        xEvent *pEvent;
	register xEvent *pe;
	register BoxPtr pBox;
	register int i;
	int numRects;

	numRects = REGION_NUM_RECTS(pRgn);
	pBox = REGION_RECTS(pRgn);
	if(!(pEvent = (xEvent *)ALLOCATE_LOCAL(numRects * sizeof(xEvent))))
		return;
	pe = pEvent;

	for (i=1; i<=numRects; i++, pe++, pBox++)
	{
	    pe->u.u.type = GraphicsExpose;
	    pe->u.graphicsExposure.drawable = drawable;
	    pe->u.graphicsExposure.x = pBox->x1;
	    pe->u.graphicsExposure.y = pBox->y1;
	    pe->u.graphicsExposure.width = pBox->x2 - pBox->x1;
	    pe->u.graphicsExposure.height = pBox->y2 - pBox->y1;
	    pe->u.graphicsExposure.count = numRects - i;
	    pe->u.graphicsExposure.majorEvent = major;
	    pe->u.graphicsExposure.minorEvent = minor;
	}
	TryClientEvents(client, pEvent, numRects,
			    (Mask)0, NoEventMask, NullGrab);
	DEALLOCATE_LOCAL(pEvent);
    }
    else
    {
        xEvent event;
	event.u.u.type = NoExpose;
	event.u.noExposure.drawable = drawable;
	event.u.noExposure.majorEvent = major;
	event.u.noExposure.minorEvent = minor;
	TryClientEvents(client, &event, 1,
	    (Mask)0, NoEventMask, NullGrab);
    }
}

void
miSendExposures(pWin, pRgn, dx, dy)
    WindowPtr pWin;
    RegionPtr pRgn;
    register int dx, dy;
{
    register BoxPtr pBox;
    int numRects;
    register xEvent *pEvent, *pe;
    register int i;

    pBox = REGION_RECTS(pRgn);
    numRects = REGION_NUM_RECTS(pRgn);
    if(!(pEvent = (xEvent *) ALLOCATE_LOCAL(numRects * sizeof(xEvent))))
	return;

    for (i=numRects, pe = pEvent; --i >= 0; pe++, pBox++)
    {
	pe->u.u.type = Expose;
	pe->u.expose.window = pWin->drawable.id;
	pe->u.expose.x = pBox->x1 - dx;
	pe->u.expose.y = pBox->y1 - dy;
	pe->u.expose.width = pBox->x2 - pBox->x1;
	pe->u.expose.height = pBox->y2 - pBox->y1;