xref: /xsrc/external/mit/xorg-server.old/dist/hw/xfree86/xaa/xaaRect.c

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "misc.h"
#include "xf86.h"
#include "xf86_OSproc.h"

#include <X11/X.h>
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "xf86str.h"
#include "xaa.h"
#include "xaalocal.h"

/*
   Much of this file based on code by
	Harm Hanemaayer (H.Hanemaayer@inter.nl.net).
*/


void
XAAPolyRectangleThinSolid(
    DrawablePtr  pDrawable,
    GCPtr        pGC,
    int	         nRectsInit,
    xRectangle  *pRectsInit )
{
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_GC(pGC);
    int         nClipRects;     /* number of clip rectangles */
    BoxPtr      pClipRects;     /* points to the list of clip rects */
    int         xOrigin;        /* Drawables x origin */
    int         yOrigin;        /* Drawables x origin */
    xRectangle *pRect;          /* list of rects */
    int         nRects;         /* running count of number of rects */
    int         origX1, origY1; /* original rectangle's U/L corner */
    int         origX2, origY2; /* original rectangle's L/R corner */
    int         clippedX1;      /* clipped rectangle's left x */
    int         clippedY1;      /* clipped rectangle's top y */
    int         clippedX2;      /* clipped rectangle's right x */
    int         clippedY2;      /* clipped rectangle's bottom y */
    int         clipXMin;       /* upper left corner of clip rect */
    int         clipYMin;       /* upper left corner of clip rect */
    int         clipXMax;       /* lower right corner of clip rect */
    int         clipYMax;       /* lower right corner of clip rect */
    int         width, height;  /* width and height of rect */

    nClipRects = RegionNumRects(pGC->pCompositeClip);
    pClipRects = RegionRects(pGC->pCompositeClip);

    if(!nClipRects) return;

    xOrigin = pDrawable->x;
    yOrigin = pDrawable->y;


    (*infoRec->SetupForSolidLine)(infoRec->pScrn,
			pGC->fgPixel, pGC->alu, pGC->planemask);


    for ( ; nClipRects > 0;
	  nClipRects--, pClipRects++ )
    {
        clipYMin = pClipRects->y1;
        clipYMax = pClipRects->y2 - 1;
        clipXMin = pClipRects->x1;
        clipXMax = pClipRects->x2 - 1;

	for (pRect = pRectsInit, nRects = nRectsInit;
	     nRects > 0;
	     nRects--, pRect++ )
        {
	    /* translate rectangle data over to the drawable */
            origX1 = pRect->x + xOrigin;
	    origY1 = pRect->y + yOrigin;
            origX2 = origX1 + pRect->width;
	    origY2 = origY1 + pRect->height;

	    /* reject entire rectangle if completely outside clip rect */
	    if ((origX1 > clipXMax) || (origX2 < clipXMin) ||
		(origY1 > clipYMax) || (origY2 < clipYMin))
	        continue;

	    /* clip the rectangle */
	    clippedX1 = max (origX1, clipXMin);
	    clippedX2 = min (origX2, clipXMax);
	    clippedY1 = max (origY1, clipYMin);
	    clippedY2 = min (origY2, clipYMax);

	    width = clippedX2 - clippedX1 + 1;

	    if (origY1 >= clipYMin) {
		(*infoRec->SubsequentSolidHorVertLine)(infoRec->pScrn,
			clippedX1, clippedY1, width, DEGREES_0);

		/* don't overwrite corner */
		clippedY1++;
	    }

	    if ((origY2 <= clipYMax) && (origY1 != origY2)) {
		(*infoRec->SubsequentSolidHorVertLine)(infoRec->pScrn,
			clippedX1, clippedY2, width, DEGREES_0);

		/* don't overwrite corner */
		clippedY2--;
	    }

	    if (clippedY2 < clippedY1) continue;

	    height = clippedY2 - clippedY1 + 1;

	    /* draw vertical edges using lines if not clipped out */
            if (origX1 >= clipXMin)
		(*infoRec->SubsequentSolidHorVertLine)(infoRec->pScrn,
			clippedX1, clippedY1, height, DEGREES_270);

            if ((origX2 <= clipXMax) && (origX2 != origX1))
		(*infoRec->SubsequentSolidHorVertLine)(infoRec->pScrn,
			clippedX2, clippedY1, height, DEGREES_270);
	}
    }

    SET_SYNC_FLAG(infoRec);
}