xenocara/xserver/fb/fbline.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
fbZeroLine (DrawablePtr	pDrawable,
	    GCPtr	pGC,
	    int		mode,
	    int		npt,
	    DDXPointPtr	ppt)
{
    int		    x1, y1, x2, y2;
    int		    x, y;
    int		    dashOffset;

    x = pDrawable->x;
    y = pDrawable->y;
    x1 = ppt->x;
    y1 = ppt->y;
    dashOffset = pGC->dashOffset;
    while (--npt)
    {
	++ppt;
	x2 = ppt->x;
	y2 = ppt->y;
	if (mode == CoordModePrevious)
	{
	    x2 += x1;
	    y2 += y1;
	}
	fbSegment (pDrawable, pGC, x1 + x, y1 + y, 
		   x2 + x, y2 + y, 
		   npt == 1 && pGC->capStyle != CapNotLast,
		   &dashOffset);
	x1 = x2;
	y1 = y2;
    }
}

void
fbZeroSegment (DrawablePtr  pDrawable,
	       GCPtr	    pGC,
	       int	    nseg,
	       xSegment	    *pSegs)
{
    int	    dashOffset;
    int	    x, y;
    Bool    drawLast = pGC->capStyle != CapNotLast;
    
    x = pDrawable->x;
    y = pDrawable->y;
    while (nseg--)
    {
	dashOffset = pGC->dashOffset;
	fbSegment (pDrawable, pGC, 
		   pSegs->x1 + x, pSegs->y1 + y,
		   pSegs->x2 + x, pSegs->y2 + y,
		   drawLast,
		   &dashOffset);
	pSegs++;
    }
}

void
fbFixCoordModePrevious (int	    npt,
			DDXPointPtr ppt)
{
    int	    x, y;

    x = ppt->x;
    y = ppt->y;
    npt--;
    while (npt--)
    {
	ppt++;
	x = (ppt->x += x);
	y = (ppt->y += y);
    }
}

void
fbPolyLine (DrawablePtr	pDrawable,
	    GCPtr	pGC,
	    int		mode,
	    int		npt,
	    DDXPointPtr	ppt)
{
    void	(*line) (DrawablePtr, GCPtr, int mode, int npt, DDXPointPtr ppt);
    
    if (pGC->lineWidth == 0)
    {
	line = fbZeroLine;
	if (pGC->fillStyle == FillSolid &&
	    pGC->lineStyle == LineSolid &&
	    RegionNumRects (fbGetCompositeClip(pGC)) == 1)
	{
	    switch (pDrawable->bitsPerPixel) {
	    case 8:  line = fbPolyline8; break;
	    case 16: line = fbPolyline16; break;
	    case 24: line = fbPolyline24; break;
	    case 32: line = fbPolyline32; break;
	    }
	}
    }
    else
    {
	if (pGC->lineStyle != LineSolid)
	    line = miWideDash;
	else
	    line = miWideLine;
    }
    (*line) (pDrawable, pGC, mode, npt, ppt);
}

void
fbPolySegment (DrawablePtr  pDrawable,
	       GCPtr	    pGC,
	       int	    nseg,
	       xSegment	    *pseg)
{
    void    (*seg) (DrawablePtr pDrawable, GCPtr pGC, int nseg, xSegment *pseg);

    if (pGC->lineWidth == 0)
    {
	seg = fbZeroSegment;
	if (pGC->fillStyle == FillSolid &&
	    pGC->lineStyle == LineSolid &&
	    RegionNumRects (fbGetCompositeClip(pGC)) == 1)
	{
	    switch (pDrawable->bitsPerPixel) {
	    case 8:  seg = fbPolySegment8; break;
	    case 16: seg = fbPolySegment16; break;
	    case 24: seg = fbPolySegment24; break;
	    case 32: seg = fbPolySegment32; break;
	    }
	}
    }
    else
    {
	seg = miPolySegment;
    }
    (*seg) (pDrawable, pGC, nseg, pseg);
}