/*
 * Copyright © 2004 Philip Blundell
 *
 * 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 Philip Blundell not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Philip Blundell makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * PHILIP BLUNDELL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL PHILIP BLUNDELL 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.
 */

#include    <X11/X.h>
#include    "scrnintstr.h"
#include    "windowstr.h"
#include    "dixfontstr.h"
#include    "mi.h"
#include    "regionstr.h"
#include    "globals.h"
#include    "gcstruct.h"
#include    "shadow.h"
#include    "fb.h"

#if ROTATE == 270

#define WINSTEPX(stride)    (stride)
#define WINSTART(x,y)       (((pScreen->height - 1) - y) + (x * winStride))
#define WINSTEPY()	    -1

#elif ROTATE == 90

#define WINSTEPX(stride)    (-stride)
#define WINSTEPY()	    1
#define WINSTART(x,y)       (((pScreen->width - 1 - x) * winStride) + y)

#else

#error This rotation is not supported here

#endif

#ifdef __arm__
#define PREFETCH
#endif

void
FUNC (ScreenPtr	    pScreen,
      shadowBufPtr  pBuf);

void
FUNC (ScreenPtr	    pScreen,
      shadowBufPtr  pBuf)
{
    RegionPtr	damage = shadowDamage(pBuf);
    PixmapPtr	pShadow = pBuf->pPixmap;
    int		nbox = REGION_NUM_RECTS (damage);
    BoxPtr	pbox = REGION_RECTS (damage);
    FbBits	*shaBits;
    Data	*shaBase, *shaLine, *sha;
    FbStride	shaStride, winStride;
    int		shaBpp;
    int		shaXoff, shaYoff;   /* XXX assumed to be zero */
    int		x, y, w, h;
    Data	*winBase, *win, *winLine;
    CARD32	winSize;

    fbGetDrawable (&pShadow->drawable, shaBits, shaStride, shaBpp, shaXoff, shaYoff);
    shaBase = (Data *) shaBits;
    shaStride = shaStride * sizeof (FbBits) / sizeof (Data);

    winBase = (Data *) (*pBuf->window) (pScreen, 0, 0,
					SHADOW_WINDOW_WRITE,
					&winSize, pBuf->closure);
    winStride = (Data *) (*pBuf->window) (pScreen, 1, 0,
					  SHADOW_WINDOW_WRITE,
					  &winSize, pBuf->closure) - winBase;

    while (nbox--)
    {
        x = pbox->x1;
        y = pbox->y1;
        w = (pbox->x2 - pbox->x1);
        h = pbox->y2 - pbox->y1;

	shaLine = shaBase + (y * shaStride) + x;
#ifdef PREFETCH
	__builtin_prefetch (shaLine);
#endif
	winLine = winBase + WINSTART(x, y);

        while (h--)
        {
	    sha = shaLine;
	    win = winLine;

            while (sha < (shaLine + w - 16))
            {
#ifdef PREFETCH
		__builtin_prefetch (sha + shaStride);
#endif
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);

		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);

		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);

		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
		*win = *sha++;
		win += WINSTEPX(winStride);
            }

            while (sha < (shaLine + w))
            {
		*win = *sha++;
		win += WINSTEPX(winStride);
            }

	    y++;
	    shaLine += shaStride;
	    winLine += WINSTEPY();
        }
        pbox++;
    } /*  nbox */
}