xenocara/xserver/fb/fbfillsp.c

/*
 * Copyright © 1998 Keith Packard
 *
 * 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, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD 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.
 */

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

#include "fb.h"

void
fbFillSpans (DrawablePtr    pDrawable,
	     GCPtr	    pGC,
	     int	    n,
	     DDXPointPtr    ppt,
	     int	    *pwidth,
	     int	    fSorted)
{
    RegionPtr	    pClip = fbGetCompositeClip(pGC);
    BoxPtr	    pextent, pbox;
    int		    nbox;
    int		    extentX1, extentX2, extentY1, extentY2;
    int		    fullX1, fullX2, fullY1;
    int		    partX1, partX2;
    
    pextent = RegionExtents(pClip);
    extentX1 = pextent->x1;
    extentY1 = pextent->y1;
    extentX2 = pextent->x2;
    extentY2 = pextent->y2;
    while (n--)
    {
	fullX1 = ppt->x;
	fullY1 = ppt->y;
	fullX2 = fullX1 + (int) *pwidth;
	ppt++;
	pwidth++;
	
	if (fullY1 < extentY1 || extentY2 <= fullY1)
	    continue;
	
	if (fullX1 < extentX1)
	    fullX1 = extentX1;

	if (fullX2 > extentX2)
	    fullX2 = extentX2;
	
	if (fullX1 >= fullX2)
	    continue;
	
	nbox = RegionNumRects (pClip);
	if (nbox == 1)
	{
	    fbFill (pDrawable,
		    pGC,
		    fullX1, fullY1, fullX2-fullX1, 1);
	}
	else
	{
	    pbox = RegionRects(pClip);
	    while(nbox--)
	    {
		if (pbox->y1 <= fullY1 && fullY1 < pbox->y2)
		{
		    partX1 = pbox->x1;
		    if (partX1 < fullX1)
			partX1 = fullX1;
		    partX2 = pbox->x2;
		    if (partX2 > fullX2)
			partX2 = fullX2;
		    if (partX2 > partX1)
		    {
			fbFill (pDrawable, pGC,
				partX1, fullY1,
				partX2 - partX1, 1);
		    }
		}
		pbox++;
	    }
	}
    }
}