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- /***********************************************************
- Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
- and the Massachusetts Institute of Technology, Cambridge, 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 names of Digital or MIT 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: miwindow.c,v 5.8 91/05/29 14:56:14 keith Exp $ */
- #include "X.h"
- #include "miscstruct.h"
- #include "region.h"
- #include "mi.h"
- #include "windowstr.h"
- #include "scrnintstr.h"
- #include "pixmapstr.h"
-
- void
- miClearToBackground(pWin, x, y, w, h, generateExposures)
- WindowPtr pWin;
- short x,y;
- unsigned short w,h;
- Bool generateExposures;
- {
- BoxRec box;
- RegionRec reg;
- RegionPtr pBSReg = NullRegion;
- ScreenPtr pScreen;
- BoxPtr extents;
- int x1, y1, x2, y2;
-
- /* compute everything using ints to avoid overflow */
-
- x1 = pWin->drawable.x + x;
- y1 = pWin->drawable.y + y;
- if (w)
- x2 = x1 + (int) w;
- else
- x2 = x1 + (int) pWin->drawable.width - (int) x;
- if (h)
- y2 = y1 + h;
- else
- y2 = y1 + (int) pWin->drawable.height - (int) y;
-
- extents = &pWin->clipList.extents;
-
- /* clip the resulting rectangle to the window clipList extents. This
- * makes sure that the result will fit in a box, given that the
- * screen is < 32768 on a side.
- */
-
- if (x1 < extents->x1)
- x1 = extents->x1;
- if (x2 > extents->x2)
- x2 = extents->x2;
- if (y1 < extents->y1)
- y1 = extents->y1;
- if (y2 > extents->y2)
- y2 = extents->y2;
-
- if (x2 <= x1 || y2 <= y1)
- {
- x2 = x1 = 0;
- y2 = y1 = 0;
- }
-
- box.x1 = x1;
- box.x2 = x2;
- box.y1 = y1;
- box.y2 = y2;
-
- pScreen = pWin->drawable.pScreen;
- (*pScreen->RegionInit) (®, &box, 1);
- if (pWin->backStorage)
- {
- /*
- * If the window has backing-store on, call through the
- * ClearToBackground vector to handle the special semantics
- * (i.e. things backing store is to be cleared out and
- * an Expose event is to be generated for those areas in backing
- * store if generateExposures is TRUE).
- */
- pBSReg = (* pScreen->ClearBackingStore)(pWin, x, y, w, h,
- generateExposures);
- }
-
- (* pScreen->Intersect)(®, ®, &pWin->clipList);
- if (generateExposures)
- (*pScreen->WindowExposures)(pWin, ®, pBSReg);
- else if (pWin->backgroundState != None)
- (*pScreen->PaintWindowBackground)(pWin, ®, PW_BACKGROUND);
- (* pScreen->RegionUninit)(®);
- if (pBSReg)
- (* pScreen->RegionDestroy)(pBSReg);
- }
-