xref: /xsrc/external/mit/xorg-server/dist/exa/exa_accel.c

/*
 * Copyright � 2001 Keith Packard
 *
 * Partly based on code that is Copyright � The XFree86 Project Inc.
 *
 * 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *    Michel D�nzer <michel@tungstengraphics.com>
 *
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "exa_priv.h"
#include <X11/fonts/fontstruct.h>
#include "dixfontstr.h"
#include "exa.h"

static void
exaFillSpans(DrawablePtr pDrawable, GCPtr pGC, int n,
	     DDXPointPtr ppt, int *pwidth, int fSorted)
{
    ScreenPtr	    pScreen = pDrawable->pScreen;
    ExaScreenPriv (pScreen);
    RegionPtr	    pClip = fbGetCompositeClip(pGC);
    PixmapPtr	    pPixmap = exaGetDrawablePixmap (pDrawable);
    ExaPixmapPriv (pPixmap);
    BoxPtr	    pextent, pbox;
    int		    nbox;
    int		    extentX1, extentX2, extentY1, extentY2;
    int		    fullX1, fullX2, fullY1;
    int		    partX1, partX2;
    int		    off_x, off_y;
    ExaMigrationRec pixmaps[1];

    pixmaps[0].as_dst = TRUE;
    pixmaps[0].as_src = FALSE;
    pixmaps[0].pPix = pPixmap;
    pixmaps[0].pReg = NULL;

    if (pExaScr->swappedOut ||
	pGC->fillStyle != FillSolid ||
	pExaPixmap->accel_blocked)
    {
	ExaCheckFillSpans (pDrawable, pGC, n, ppt, pwidth, fSorted);
	return;
    } else {
	exaDoMigration (pixmaps, 1, TRUE);
    }

    if (!(pPixmap = exaGetOffscreenPixmap (pDrawable, &off_x, &off_y)) ||
	!(*pExaScr->info->PrepareSolid) (pPixmap,
					 pGC->alu,
					 pGC->planemask,
					 pGC->fgPixel))
    {
	ExaCheckFillSpans (pDrawable, pGC, n, ppt, pwidth, fSorted);
	return;
    }

    pextent = REGION_EXTENTS(pGC->pScreen, 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 = REGION_NUM_RECTS (pClip);
	if (nbox == 1)
	{
	    (*pExaScr->info->Solid) (pPixmap,
				     fullX1 + off_x, fullY1 + off_y,
				     fullX2 + off_x, fullY1 + 1 + off_y);
	}
	else
	{
	    pbox = REGION_RECTS(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) {
			(*pExaScr->info->Solid) (pPixmap,
						 partX1 + off_x, fullY1 + off_y,
						 partX2 + off_x, fullY1 + 1 + off_y);
		    }
		}
		pbox++;
	    }
	}
    }
    (*pExaScr->info->DoneSolid) (pPixmap);
    exaMarkSync(pScreen);
}

static Bool
exaDoPutImage (DrawablePtr pDrawable, GCPtr pGC, int depth, int x, int y,
	       int w, int h, int format, char *bits, int src_stride)
{
    ExaScreenPriv (pDrawable->pScreen);
    PixmapPtr pPix = exaGetDrawablePixmap (pDrawable);
    ExaPixmapPriv(pPix);
    RegionPtr pClip;
    BoxPtr pbox;
    int nbox;
    int xoff, yoff;
    int bpp = pDrawable->bitsPerPixel;
    Bool access_prepared = FALSE;

    if (pExaPixmap->accel_blocked)
	return FALSE;

    /* Don't bother with under 8bpp, XYPixmaps. */
    if (format != ZPixmap || bpp < 8)
	return FALSE;

    /* Only accelerate copies: no rop or planemask. */
    if (!EXA_PM_IS_SOLID(pDrawable, pGC->planemask) || pGC->alu != GXcopy)
	return FALSE;

    if (pExaScr->swappedOut)
	return FALSE;

    if (pExaPixmap->pDamage) {
	ExaMigrationRec pixmaps[1];

 	pixmaps[0].as_dst = TRUE;
	pixmaps[0].as_src = FALSE;
	pixmaps[0].pPix = pPix;
	pixmaps[0].pReg = DamagePendingRegion(pExaPixmap->pDamage);

	exaDoMigration (pixmaps, 1, TRUE);
    }

    pPix = exaGetOffscreenPixmap (pDrawable, &xoff, &yoff);

    if (!pPix || !pExaScr->info->UploadToScreen)
	return FALSE;

    x += pDrawable->x;
    y += pDrawable->y;

    pClip = fbGetCompositeClip(pGC);
    for (nbox = REGION_NUM_RECTS(pClip),
	 pbox = REGION_RECTS(pClip);
	 nbox--;
	 pbox++)
    {
	int x1 = x;
	int y1 = y;
	int x2 = x + w;
	int y2 = y + h;
	char *src;
	Bool ok;

	if (x1 < pbox->x1)
	    x1 = pbox->x1;
	if (y1 < pbox->y1)
	    y1 = pbox->y1;
	if (x2 > pbox->x2)
	    x2 = pbox->x2;
	if (y2 > pbox->y2)
	    y2 = pbox->y2;
	if (x1 >= x2 || y1 >= y2)
	    continue;

	src = bits + (y1 - y) * src_stride + (x1 - x) * (bpp / 8);
	ok = pExaScr->info->UploadToScreen(pPix, x1 + xoff, y1 + yoff,
					   x2 - x1, y2 - y1, src, src_stride);
	/* If we fail to accelerate the upload, fall back to using unaccelerated
	 * fb calls.
	 */
	if (!ok) {
	    FbStip *dst;
	    FbStride dst_stride;
	    int	dstBpp;
	    int	dstXoff, dstYoff;

	    if (!access_prepared) {
		ExaDoPrepareAccess(pDrawable, EXA_PREPARE_DEST);

		access_prepared = TRUE;
	    }

	    fbGetStipDrawable(pDrawable, dst, dst_stride, dstBpp,
			      dstXoff, dstYoff);

	    fbBltStip((FbStip *)bits + (y1 - y) * (src_stride / sizeof(FbStip)),
		      src_stride / sizeof(FbStip),
		      (x1 - x) * dstBpp,
		      dst + (y1 + dstYoff) * dst_stride,
		      dst_stride,
		      (x1 + dstXoff) * dstBpp,
		      (x2 - x1) * dstBpp,
		      y2 - y1,
		      GXcopy, FB_ALLONES, dstBpp);
	}
    }

    if (access_prepared)
	exaFinishAccess(pDrawable, EXA_PREPARE_DEST);
    else
	exaMarkSync(pDrawable->pScreen);

    return TRUE;
}

static void
exaPutImage (DrawablePtr pDrawable, GCPtr pGC, int depth, int x, int y,
	     int w, int h, int leftPad, int format, char *bits)
{
    if (!exaDoPutImage(pDrawable, pGC, depth, x, y, w, h, format, bits,
		       PixmapBytePad(w, pDrawable->depth)))
	ExaCheckPutImage(pDrawable, pGC, depth, x, y, w, h, leftPad, format,
			 bits);
}

static Bool inline
exaCopyNtoNTwoDir (DrawablePtr pSrcDrawable, DrawablePtr pDstDrawable,
		   GCPtr pGC, BoxPtr pbox, int nbox, int dx, int dy)
{
    ExaScreenPriv (pDstDrawable->pScreen);
    PixmapPtr pSrcPixmap, pDstPixmap;
    int src_off_x, src_off_y, dst_off_x, dst_off_y;
    int dirsetup;

    /* Need to get both pixmaps to call the driver routines */
    pSrcPixmap = exaGetOffscreenPixmap (pSrcDrawable, &src_off_x, &src_off_y);
    pDstPixmap = exaGetOffscreenPixmap (pDstDrawable, &dst_off_x, &dst_off_y);
    if (!pSrcPixmap || !pDstPixmap)
	return FALSE;

    /*
     * Now the case of a chip that only supports xdir = ydir = 1 or
     * xdir = ydir = -1, but we have xdir != ydir.
     */
    dirsetup = 0;	/* No direction set up yet. */
    for (; nbox; pbox++, nbox--) {
	if (dx >= 0 && (src_off_y + pbox->y1 + dy) != pbox->y1) {
	    /* Do a xdir = ydir = -1 blit instead. */
	    if (dirsetup != -1) {
		if (dirsetup != 0)
		    pExaScr->info->DoneCopy(pDstPixmap);
		dirsetup = -1;
		if (!(*pExaScr->info->PrepareCopy)(pSrcPixmap,
						   pDstPixmap,
						   -1, -1,
						   pGC ? pGC->alu : GXcopy,
						   pGC ? pGC->planemask :
							 FB_ALLONES))
		    return FALSE;
	    }
	    (*pExaScr->info->Copy)(pDstPixmap,
				   src_off_x + pbox->x1 + dx,
				   src_off_y + pbox->y1 + dy,
				   dst_off_x + pbox->x1,
				   dst_off_y + pbox->y1,
				   pbox->x2 - pbox->x1,
				   pbox->y2 - pbox->y1);
	} else if (dx < 0 && (src_off_y + pbox->y1 + dy) != pbox->y1) {
	    /* Do a xdir = ydir = 1 blit instead. */
	    if (dirsetup != 1) {
		if (dirsetup != 0)
		    pExaScr->info->DoneCopy(pDstPixmap);
		dirsetup = 1;
		if (!(*pExaScr->info->PrepareCopy)(pSrcPixmap,
						   pDstPixmap,
						   1, 1,
						   pGC ? pGC->alu : GXcopy,
						   pGC ? pGC->planemask :
							 FB_ALLONES))
		    return FALSE;
	    }
	    (*pExaScr->info->Copy)(pDstPixmap,
				   src_off_x + pbox->x1 + dx,
				   src_off_y + pbox->y1 + dy,
				   dst_off_x + pbox->x1,
				   dst_off_y + pbox->y1,
				   pbox->x2 - pbox->x1,
				   pbox->y2 - pbox->y1);
	} else if (dx >= 0) {
	    /*
	     * xdir = 1, ydir = -1.
	     * Perform line-by-line xdir = ydir = 1 blits, going up.
	     */
	    int i;
	    if (dirsetup != 1) {
		if (dirsetup != 0)
		    pExaScr->info->DoneCopy(pDstPixmap);
		dirsetup = 1;
		if (!(*pExaScr->info->PrepareCopy)(pSrcPixmap,
						   pDstPixmap,
						   1, 1,
						   pGC ? pGC->alu : GXcopy,
						   pGC ? pGC->planemask :
							 FB_ALLONES))
		    return FALSE;
	    }
	    for (i = pbox->y2 - pbox->y1 - 1; i >= 0; i--)
		(*pExaScr->info->Copy)(pDstPixmap,
				       src_off_x + pbox->x1 + dx,
				       src_off_y + pbox->y1 + dy + i,
				       dst_off_x + pbox->x1,
				       dst_off_y + pbox->y1 + i,
				       pbox->x2 - pbox->x1, 1);
	} else {
	    /*
	     * xdir = -1, ydir = 1.
	     * Perform line-by-line xdir = ydir = -1 blits, going down.
	     */
	    int i;
	    if (dirsetup != -1) {
		if (dirsetup != 0)
		    pExaScr->info->DoneCopy(pDstPixmap);
		dirsetup = -1;
		if (!(*pExaScr->info->PrepareCopy)(pSrcPixmap,
						   pDstPixmap,
						   -1, -1,
						   pGC ? pGC->alu : GXcopy,
						   pGC ? pGC->planemask :
							 FB_ALLONES))
		    return FALSE;
	    }
	    for (i = 0; i < pbox->y2 - pbox->y1; i++)
		(*pExaScr->info->Copy)(pDstPixmap,
				       src_off_x + pbox->x1 + dx,
				       src_off_y + pbox->y1 + dy + i,
				       dst_off_x + pbox->x1,
				       dst_off_y + pbox->y1 + i,
				       pbox->x2 - pbox->x1, 1);
	}
    }
    if (dirsetup != 0)
	pExaScr->info->DoneCopy(pDstPixmap);
    exaMarkSync(pDstDrawable->pScreen);
    return TRUE;
}

void
exaCopyNtoN (DrawablePtr    pSrcDrawable,
	     DrawablePtr    pDstDrawable,
	     GCPtr	    pGC,
	     BoxPtr	    pbox,
	     int	    nbox,
	     int	    dx,
	     int	    dy,
	     Bool	    reverse,
	     Bool	    upsidedown,
	     Pixel	    bitplane,
	     void	    *closure)
{
    ExaScreenPriv (pDstDrawable->pScreen);
    PixmapPtr pSrcPixmap, pDstPixmap;
    ExaPixmapPrivPtr pSrcExaPixmap, pDstExaPixmap;
    int	    src_off_x, src_off_y;
    int	    dst_off_x, dst_off_y;
    ExaMigrationRec pixmaps[2];
    RegionPtr srcregion = NULL, dstregion = NULL;
    xRectangle *rects;

    /* avoid doing copy operations if no boxes */
    if (nbox == 0)
	return;

    pSrcPixmap = exaGetDrawablePixmap (pSrcDrawable);
    pDstPixmap = exaGetDrawablePixmap (pDstDrawable);

    exaGetDrawableDeltas (pSrcDrawable, pSrcPixmap, &src_off_x, &src_off_y);
    exaGetDrawableDeltas (pDstDrawable, pDstPixmap, &dst_off_x, &dst_off_y);

    rects = xalloc(nbox * sizeof(xRectangle));

    if (rects) {
	int i;
	int ordering;

	for (i = 0; i < nbox; i++) {
	    rects[i].x = pbox[i].x1 + dx + src_off_x;
	    rects[i].y = pbox[i].y1 + dy + src_off_y;
	    rects[i].width = pbox[i].x2 - pbox[i].x1;
	    rects[i].height = pbox[i].y2 - pbox[i].y1;
	}

	/* This must match the miRegionCopy() logic for reversing rect order */
	if (nbox == 1 || (dx > 0 && dy > 0) ||
	    (pDstDrawable != pSrcDrawable &&
	     (pDstDrawable->type != DRAWABLE_WINDOW ||
	      pSrcDrawable->type != DRAWABLE_WINDOW)))
	    ordering = CT_YXBANDED;
	else
	    ordering = CT_UNSORTED;

	srcregion  = RECTS_TO_REGION(pScreen, nbox, rects, ordering);
	xfree(rects);

	if (!pGC || !exaGCReadsDestination(pDstDrawable, pGC->planemask,
					   pGC->fillStyle, pGC->alu,
					   pGC->clientClipType)) {
	    dstregion = REGION_CREATE(pScreen, NullBox, 0);
	    REGION_COPY(pScreen, dstregion, srcregion);
	    REGION_TRANSLATE(pScreen, dstregion, dst_off_x - dx - src_off_x,
			     dst_off_y - dy - src_off_y);
	}
    }

    pixmaps[0].as_dst = TRUE;
    pixmaps[0].as_src = FALSE;
    pixmaps[0].pPix = pDstPixmap;
    pixmaps[0].pReg = dstregion;
    pixmaps[1].as_dst = FALSE;
    pixmaps[1].as_src = TRUE;
    pixmaps[1].pPix = pSrcPixmap;
    pixmaps[1].pReg = srcregion;

    pSrcExaPixmap = ExaGetPixmapPriv (pSrcPixmap);
    pDstExaPixmap = ExaGetPixmapPriv (pDstPixmap);

    /* Check whether the accelerator can use this pixmap.
     * If the pitch of the pixmaps is out of range, there's nothing
     * we can do but fall back to software rendering.
     */
    if (pSrcExaPixmap->accel_blocked & EXA_RANGE_PITCH ||
        pDstExaPixmap->accel_blocked & EXA_RANGE_PITCH)
	goto fallback;

    /* If the width or the height of either of the pixmaps
     * is out of range, check whether the boxes are actually out of the
     * addressable range as well. If they aren't, we can still do
     * the copying in hardware.
     */
    if (pSrcExaPixmap->accel_blocked || pDstExaPixmap->accel_blocked) {
        int i;

        for (i = 0; i < nbox; i++) {
            /* src */
            if ((pbox[i].x2 + dx + src_off_x) >= pExaScr->info->maxX ||
                (pbox[i].y2 + dy + src_off_y) >= pExaScr->info->maxY)
                goto fallback;

            /* dst */
            if ((pbox[i].x2 + dst_off_x) >= pExaScr->info->maxX ||
                (pbox[i].y2 + dst_off_y) >= pExaScr->info->maxY)
                goto fallback;
        }
    }

    exaDoMigration (pixmaps, 2, TRUE);

    /* Mixed directions must be handled specially if the card is lame */
    if ((pExaScr->info->flags & EXA_TWO_BITBLT_DIRECTIONS) &&
	reverse != upsidedown) {
	if (exaCopyNtoNTwoDir(pSrcDrawable, pDstDrawable, pGC, pbox, nbox,
			       dx, dy))
	    goto out;
	goto fallback;
    }

    if (!exaPixmapIsOffscreen(pSrcPixmap) ||
	!exaPixmapIsOffscreen(pDstPixmap) ||
	!(*pExaScr->info->PrepareCopy) (pSrcPixmap, pDstPixmap, reverse ? -1 : 1,
					upsidedown ? -1 : 1,
					pGC ? pGC->alu : GXcopy,
					pGC ? pGC->planemask : FB_ALLONES)) {
	goto fallback;
    }

    while (nbox--)
    {
	(*pExaScr->info->Copy) (pDstPixmap,
				pbox->x1 + dx + src_off_x,
				pbox->y1 + dy + src_off_y,
				pbox->x1 + dst_off_x, pbox->y1 + dst_off_y,
				pbox->x2 - pbox->x1, pbox->y2 - pbox->y1);
	pbox++;
    }

    (*pExaScr->info->DoneCopy) (pDstPixmap);
    exaMarkSync (pDstDrawable->pScreen);

    goto out;

fallback:
    EXA_FALLBACK(("from %p to %p (%c,%c)\n", pSrcDrawable, pDstDrawable,
		  exaDrawableLocation(pSrcDrawable),
		  exaDrawableLocation(pDstDrawable)));
    exaPrepareAccessReg (pDstDrawable, EXA_PREPARE_DEST, dstregion);
    exaPrepareAccessReg (pSrcDrawable, EXA_PREPARE_SRC, srcregion);
    fbCopyNtoN (pSrcDrawable, pDstDrawable, pGC, pbox, nbox, dx, dy, reverse,
		upsidedown, bitplane, closure);
    exaFinishAccess (pSrcDrawable, EXA_PREPARE_SRC);
    exaFinishAccess (pDstDrawable, EXA_PREPARE_DEST);

out:
    if (dstregion) {
	REGION_UNINIT(pScreen, dstregion);
	REGION_DESTROY(pScreen, dstregion);
    }
    if (srcregion) {
	REGION_UNINIT(pScreen, srcregion);
	REGION_DESTROY(pScreen, srcregion);
    }
}

RegionPtr
exaCopyArea(DrawablePtr pSrcDrawable, DrawablePtr pDstDrawable, GCPtr pGC,
	    int srcx, int srcy, int width, int height, int dstx, int dsty)
{
    ExaScreenPriv (pDstDrawable->pScreen);

    if (pExaScr->swappedOut) {
        return  ExaCheckCopyArea(pSrcDrawable, pDstDrawable, pGC,
                                 srcx, srcy, width, height, dstx, dsty);
    }

    return  fbDoCopy (pSrcDrawable, pDstDrawable, pGC,
                      srcx, srcy, width, height,
                      dstx, dsty, exaCopyNtoN, 0, NULL);
}

static void
exaPolyPoint(DrawablePtr pDrawable, GCPtr pGC, int mode, int npt,
	     DDXPointPtr ppt)
{
    int i;
    xRectangle *prect;

    /* If we can't reuse the current GC as is, don't bother accelerating the
     * points.
     */
    if (pGC->fillStyle != FillSolid) {
	ExaCheckPolyPoint(pDrawable, pGC, mode, npt, ppt);
	return;
    }

    prect = xalloc(sizeof(xRectangle) * npt);
    for (i = 0; i < npt; i++) {
	prect[i].x = ppt[i].x;
	prect[i].y = ppt[i].y;
	if (i > 0 && mode == CoordModePrevious) {
	    prect[i].x += prect[i - 1].x;
	    prect[i].y += prect[i - 1].y;
	}
	prect[i].width = 1;
	prect[i].height = 1;
    }
    pGC->ops->PolyFillRect(pDrawable, pGC, npt, prect);
    xfree(prect);
}

/**
 * exaPolylines() checks if it can accelerate the lines as a group of
 * horizontal or vertical lines (rectangles), and uses existing rectangle fill
 * acceleration if so.
 */
static void
exaPolylines(DrawablePtr pDrawable, GCPtr pGC, int mode, int npt,
	     DDXPointPtr ppt)
{
    xRectangle *prect;
    int x1, x2, y1, y2;
    int i;

    /* Don't try to do wide lines or non-solid fill style. */
    if (pGC->lineWidth != 0 || pGC->lineStyle != LineSolid ||
	pGC->fillStyle != FillSolid) {
	ExaCheckPolylines(pDrawable, pGC, mode, npt, ppt);
	return;
    }

    prect = xalloc(sizeof(xRectangle) * (npt - 1));
    x1 = ppt[0].x;
    y1 = ppt[0].y;
    /* If we have any non-horizontal/vertical, fall back. */
    for (i = 0; i < npt - 1; i++) {
	if (mode == CoordModePrevious) {
	    x2 = x1 + ppt[i + 1].x;
	    y2 = y1 + ppt[i + 1].y;
	} else {
	    x2 = ppt[i + 1].x;
	    y2 = ppt[i + 1].y;
	}

	if (x1 != x2 && y1 != y2) {
	    xfree(prect);
	    ExaCheckPolylines(pDrawable, pGC, mode, npt, ppt);
	    return;
	}

	if (x1 < x2) {
	    prect[i].x = x1;
	    prect[i].width = x2 - x1 + 1;
	} else {
	    prect[i].x = x2;
	    prect[i].width = x1 - x2 + 1;
	}
	if (y1 < y2) {
	    prect[i].y = y1;
	    prect[i].height = y2 - y1 + 1;
	} else {
	    prect[i].y = y2;
	    prect[i].height = y1 - y2 + 1;
	}

	x1 = x2;
	y1 = y2;
    }
    pGC->ops->PolyFillRect(pDrawable, pGC, npt - 1, prect);
    xfree(prect);
}

/**
 * exaPolySegment() checks if it can accelerate the lines as a group of
 * horizontal or vertical lines (rectangles), and uses existing rectangle fill
 * acceleration if so.
 */
static void
exaPolySegment (DrawablePtr pDrawable, GCPtr pGC, int nseg,
		xSegment *pSeg)
{
    xRectangle *prect;
    int i;

    /* Don't try to do wide lines or non-solid fill style. */
    if (pGC->lineWidth != 0 || pGC->lineStyle != LineSolid ||
	pGC->fillStyle != FillSolid)
    {
	ExaCheckPolySegment(pDrawable, pGC, nseg, pSeg);
	return;
    }

    /* If we have any non-horizontal/vertical, fall back. */
    for (i = 0; i < nseg; i++) {
	if (pSeg[i].x1 != pSeg[i].x2 && pSeg[i].y1 != pSeg[i].y2) {
	    ExaCheckPolySegment(pDrawable, pGC, nseg, pSeg);
	    return;
	}
    }

    prect = xalloc(sizeof(xRectangle) * nseg);
    for (i = 0; i < nseg; i++) {
	if (pSeg[i].x1 < pSeg[i].x2) {
	    prect[i].x = pSeg[i].x1;
	    prect[i].width = pSeg[i].x2 - pSeg[i].x1 + 1;
	} else {
	    prect[i].x = pSeg[i].x2;
	    prect[i].width = pSeg[i].x1 - pSeg[i].x2 + 1;
	}
	if (pSeg[i].y1 < pSeg[i].y2) {
	    prect[i].y = pSeg[i].y1;
	    prect[i].height = pSeg[i].y2 - pSeg[i].y1 + 1;
	} else {
	    prect[i].y = pSeg[i].y2;
	    prect[i].height = pSeg[i].y1 - pSeg[i].y2 + 1;
	}

	/* don't paint last pixel */
	if (pGC->capStyle == CapNotLast) {
	    if (prect[i].width == 1)
		prect[i].height--;
	    else
		prect[i].width--;
	}
    }
    pGC->ops->PolyFillRect(pDrawable, pGC, nseg, prect);
    xfree(prect);
}

static Bool exaFillRegionSolid (DrawablePtr pDrawable, RegionPtr pRegion,
				Pixel pixel, CARD32 planemask, CARD32 alu,
				unsigned int clientClipType);

static void
exaPolyFillRect(DrawablePtr pDrawable,
		GCPtr	    pGC,
		int	    nrect,
		xRectangle  *prect)
{
    ExaScreenPriv (pDrawable->pScreen);
    RegionPtr	    pClip = fbGetCompositeClip(pGC);
    PixmapPtr	    pPixmap = exaGetDrawablePixmap(pDrawable);
    ExaPixmapPriv (pPixmap);
    register BoxPtr pbox;
    BoxPtr	    pextent;
    int		    extentX1, extentX2, extentY1, extentY2;
    int		    fullX1, fullX2, fullY1, fullY2;
    int		    partX1, partX2, partY1, partY2;
    int		    xoff, yoff;
    int		    xorg, yorg;
    int		    n;
    ExaMigrationRec pixmaps[2];
    RegionPtr pReg = RECTS_TO_REGION(pScreen, nrect, prect, CT_UNSORTED);

    /* Compute intersection of rects and clip region */
    REGION_TRANSLATE(pScreen, pReg, pDrawable->x, pDrawable->y);
    REGION_INTERSECT(pScreen, pReg, pClip, pReg);

    if (!REGION_NUM_RECTS(pReg)) {
	goto out;
    }

    pixmaps[0].as_dst = TRUE;
    pixmaps[0].as_src = FALSE;
    pixmaps[0].pPix = pPixmap;
    pixmaps[0].pReg = NULL;

    exaGetDrawableDeltas(pDrawable, pPixmap, &xoff, &yoff);

    if (pExaScr->swappedOut || pExaPixmap->accel_blocked)
    {
	goto fallback;
    }

    /* For ROPs where overlaps don't matter, convert rectangles to region and
     * call exaFillRegion{Solid,Tiled}.
     */
    if ((pGC->fillStyle == FillSolid || pGC->fillStyle == FillTiled) &&
	(nrect == 1 || pGC->alu == GXcopy || pGC->alu == GXclear ||
	 pGC->alu == GXnoop || pGC->alu == GXcopyInverted ||
	 pGC->alu == GXset)) {
	if (((pGC->fillStyle == FillSolid || pGC->tileIsPixel) &&
	     exaFillRegionSolid(pDrawable, pReg, pGC->fillStyle == FillSolid ?
				pGC->fgPixel : pGC->tile.pixel,	pGC->planemask,
				pGC->alu, pGC->clientClipType)) ||
	    (pGC->fillStyle == FillTiled && !pGC->tileIsPixel &&
	     exaFillRegionTiled(pDrawable, pReg, pGC->tile.pixmap, &pGC->patOrg,
				pGC->planemask, pGC->alu,
				pGC->clientClipType))) {
	    goto out;
	}
    }

    if (pGC->fillStyle != FillSolid &&
	!(pGC->tileIsPixel && pGC->fillStyle == FillTiled))
    {
	goto fallback;
    }

    exaDoMigration (pixmaps, 1, TRUE);

    if (!exaPixmapIsOffscreen (pPixmap) ||
	!(*pExaScr->info->PrepareSolid) (pPixmap,
					 pGC->alu,
					 pGC->planemask,
					 pGC->fgPixel))
    {
fallback:
	ExaCheckPolyFillRect (pDrawable, pGC, nrect, prect);
	goto out;
    }

    xorg = pDrawable->x;
    yorg = pDrawable->y;

    pextent = REGION_EXTENTS(pGC->pScreen, pClip);
    extentX1 = pextent->x1;
    extentY1 = pextent->y1;
    extentX2 = pextent->x2;
    extentY2 = pextent->y2;
    while (nrect--)
    {
	fullX1 = prect->x + xorg;
	fullY1 = prect->y + yorg;
	fullX2 = fullX1 + (int) prect->width;
	fullY2 = fullY1 + (int) prect->height;
	prect++;

	if (fullX1 < extentX1)
	    fullX1 = extentX1;

	if (fullY1 < extentY1)
	    fullY1 = extentY1;

	if (fullX2 > extentX2)
	    fullX2 = extentX2;

	if (fullY2 > extentY2)
	    fullY2 = extentY2;

	if ((fullX1 >= fullX2) || (fullY1 >= fullY2))
	    continue;
	n = REGION_NUM_RECTS (pClip);
	if (n == 1)
	{
	    (*pExaScr->info->Solid) (pPixmap,
				     fullX1 + xoff, fullY1 + yoff,
				     fullX2 + xoff, fullY2 + yoff);
	}
	else
	{
	    pbox = REGION_RECTS(pClip);
	    /*
	     * clip the rectangle to each box in the clip region
	     * this is logically equivalent to calling Intersect(),
	     * but rectangles may overlap each other here.
	     */
	    while(n--)
	    {
		partX1 = pbox->x1;
		if (partX1 < fullX1)
		    partX1 = fullX1;
		partY1 = pbox->y1;
		if (partY1 < fullY1)
		    partY1 = fullY1;
		partX2 = pbox->x2;
		if (partX2 > fullX2)
		    partX2 = fullX2;
		partY2 = pbox->y2;
		if (partY2 > fullY2)
		    partY2 = fullY2;

		pbox++;

		if (partX1 < partX2 && partY1 < partY2) {
		    (*pExaScr->info->Solid) (pPixmap,
					     partX1 + xoff, partY1 + yoff,
					     partX2 + xoff, partY2 + yoff);
		}
	    }
	}
    }
    (*pExaScr->info->DoneSolid) (pPixmap);
    exaMarkSync(pDrawable->pScreen);

out:
    REGION_UNINIT(pScreen, pReg);
    REGION_DESTROY(pScreen, pReg);
}

const GCOps exaOps = {
    exaFillSpans,
    ExaCheckSetSpans,
    exaPutImage,
    exaCopyArea,
    ExaCheckCopyPlane,
    exaPolyPoint,
    exaPolylines,
    exaPolySegment,
    miPolyRectangle,
    ExaCheckPolyArc,
    miFillPolygon,
    exaPolyFillRect,
    miPolyFillArc,
    miPolyText8,
    miPolyText16,
    miImageText8,
    miImageText16,
    ExaCheckImageGlyphBlt,
    ExaCheckPolyGlyphBlt,
    ExaCheckPushPixels,
};

void
exaCopyWindow(WindowPtr pWin, DDXPointRec ptOldOrg, RegionPtr prgnSrc)
{
    RegionRec	rgnDst;
    int		dx, dy;
    PixmapPtr	pPixmap = (*pWin->drawable.pScreen->GetWindowPixmap) (pWin);

    dx = ptOldOrg.x - pWin->drawable.x;
    dy = ptOldOrg.y - pWin->drawable.y;
    REGION_TRANSLATE(pWin->drawable.pScreen, prgnSrc, -dx, -dy);

    REGION_INIT (pWin->drawable.pScreen, &rgnDst, NullBox, 0);

    REGION_INTERSECT(pWin->drawable.pScreen, &rgnDst, &pWin->borderClip, prgnSrc);
#ifdef COMPOSITE
    if (pPixmap->screen_x || pPixmap->screen_y)
	REGION_TRANSLATE (pWin->drawable.pScreen, &rgnDst,
			  -pPixmap->screen_x, -pPixmap->screen_y);
#endif

    fbCopyRegion (&pPixmap->drawable, &pPixmap->drawable,
		  NULL,
		  &rgnDst, dx, dy, exaCopyNtoN, 0, NULL);

    REGION_UNINIT(pWin->drawable.pScreen, &rgnDst);
}

static Bool
exaFillRegionSolid (DrawablePtr	pDrawable, RegionPtr pRegion, Pixel pixel,
		    CARD32 planemask, CARD32 alu, unsigned int clientClipType)
{
    ExaScreenPriv(pDrawable->pScreen);
    PixmapPtr pPixmap = exaGetDrawablePixmap (pDrawable);
    ExaPixmapPriv (pPixmap);
    int xoff, yoff;
    ExaMigrationRec pixmaps[1];
    Bool ret = FALSE;

    pixmaps[0].as_dst = TRUE;
    pixmaps[0].as_src = FALSE;
    pixmaps[0].pPix = pPixmap;
    pixmaps[0].pReg = exaGCReadsDestination(pDrawable, planemask, FillSolid,
					    alu, clientClipType)
	? NULL : pRegion;

    exaGetDrawableDeltas(pDrawable, pPixmap, &xoff, &yoff);
    REGION_TRANSLATE(pScreen, pRegion, xoff, yoff);

    if (pExaPixmap->accel_blocked)
    {
	goto out;
    } else {
	exaDoMigration (pixmaps, 1, TRUE);
    }

    if (exaPixmapIsOffscreen (pPixmap) &&
	(*pExaScr->info->PrepareSolid) (pPixmap, alu, planemask, pixel))
    {
	int nbox;
	BoxPtr pBox;

	nbox = REGION_NUM_RECTS (pRegion);
	pBox = REGION_RECTS (pRegion);

	while (nbox--)
	{
	    (*pExaScr->info->Solid) (pPixmap, pBox->x1, pBox->y1, pBox->x2,
				     pBox->y2);
	    pBox++;
	}
	(*pExaScr->info->DoneSolid) (pPixmap);
	exaMarkSync(pDrawable->pScreen);

	if (!(pExaScr->info->flags & EXA_HANDLES_PIXMAPS) &&
	    pDrawable->width == 1 && pDrawable->height == 1 &&
	    pDrawable->bitsPerPixel != 24) {
	    ExaPixmapPriv(pPixmap);

	    switch (pDrawable->bitsPerPixel) {
	    case 32:
		*(CARD32*)pExaPixmap->sys_ptr = pixel;
		break;
	    case 16:
		*(CARD16*)pExaPixmap->sys_ptr = pixel;
		break;
	    case 8:
		*(CARD8*)pExaPixmap->sys_ptr = pixel;
	    }

	    REGION_UNION(pScreen, &pExaPixmap->validSys, &pExaPixmap->validSys,
			 pRegion);
	}

	ret = TRUE;
    }

out:
    REGION_TRANSLATE(pScreen, pRegion, -xoff, -yoff);

    return ret;
}

/* Try to do an accelerated tile of the pTile into pRegion of pDrawable.
 * Based on fbFillRegionTiled(), fbTile().
 */
Bool
exaFillRegionTiled (DrawablePtr pDrawable, RegionPtr pRegion, PixmapPtr pTile,
		    DDXPointPtr pPatOrg, CARD32 planemask, CARD32 alu,
		    unsigned int clientClipType)
{
    ExaScreenPriv(pDrawable->pScreen);
    PixmapPtr pPixmap;
    ExaPixmapPrivPtr pExaPixmap;
    ExaPixmapPrivPtr pTileExaPixmap = ExaGetPixmapPriv(pTile);
    int xoff, yoff;
    int tileWidth, tileHeight;
    ExaMigrationRec pixmaps[2];
    int nbox = REGION_NUM_RECTS (pRegion);
    BoxPtr pBox = REGION_RECTS (pRegion);
    Bool ret = FALSE;
    int i;

    tileWidth = pTile->drawable.width;
    tileHeight = pTile->drawable.height;

    /* If we're filling with a solid color, grab it out and go to
     * FillRegionSolid, saving numerous copies.
     */
    if (tileWidth == 1 && tileHeight == 1)
	return exaFillRegionSolid(pDrawable, pRegion,
				  exaGetPixmapFirstPixel (pTile), planemask,
				  alu, clientClipType);

    pixmaps[0].as_dst = TRUE;
    pixmaps[0].as_src = FALSE;
    pixmaps[0].pPix = pPixmap = exaGetDrawablePixmap (pDrawable);
    pixmaps[0].pReg = exaGCReadsDestination(pDrawable, planemask, FillTiled,
					    alu, clientClipType)
	? NULL : pRegion;
    pixmaps[1].as_dst = FALSE;
    pixmaps[1].as_src = TRUE;
    pixmaps[1].pPix = pTile;
    pixmaps[1].pReg = NULL;

    pExaPixmap = ExaGetPixmapPriv (pPixmap);

    if (pExaPixmap->accel_blocked || pTileExaPixmap->accel_blocked)
    {
	return FALSE;
    } else {
	exaDoMigration (pixmaps, 2, TRUE);
    }

    pPixmap = exaGetOffscreenPixmap (pDrawable, &xoff, &yoff);

    if (!pPixmap || !exaPixmapIsOffscreen(pTile))
	return FALSE;

    if ((*pExaScr->info->PrepareCopy) (pTile, pPixmap, 1, 1, alu, planemask))
    {
	if (xoff || yoff)
	    REGION_TRANSLATE(pScreen, pRegion, xoff, yoff);

	for (i = 0; i < nbox; i++)
	{
	    int height = pBox[i].y2 - pBox[i].y1;
	    int dstY = pBox[i].y1;
	    int tileY;

	    if (alu == GXcopy)
		height = min(height, tileHeight);

	    modulus(dstY - yoff - pDrawable->y - pPatOrg->y, tileHeight, tileY);

	    while (height > 0) {
		int width = pBox[i].x2 - pBox[i].x1;
		int dstX = pBox[i].x1;
		int tileX;
		int h = tileHeight - tileY;

		if (alu == GXcopy)
		    width = min(width, tileWidth);

		if (h > height)
		    h = height;
		height -= h;

		modulus(dstX - xoff - pDrawable->x - pPatOrg->x, tileWidth,
			tileX);

		while (width > 0) {
		    int w = tileWidth - tileX;
		    if (w > width)
			w = width;
		    width -= w;

		    (*pExaScr->info->Copy) (pPixmap, tileX, tileY, dstX, dstY,
					    w, h);
		    dstX += w;
		    tileX = 0;
		}
		dstY += h;
		tileY = 0;
	    }
	}
	(*pExaScr->info->DoneCopy) (pPixmap);

	/* With GXcopy, we only need to do the basic algorithm up to the tile
	 * size; then, we can just keep doubling the destination in each
	 * direction until it fills the box. This way, the number of copy
	 * operations is O(log(rx)) + O(log(ry)) instead of O(rx * ry), where
	 * rx/ry is the ratio between box and tile width/height. This can make
	 * a big difference if each driver copy incurs a significant constant
	 * overhead.
	 */
	if (alu != GXcopy)
	    ret = TRUE;
	else {
	    Bool more_copy = FALSE;

	    for (i = 0; i < nbox; i++) {
		int dstX = pBox[i].x1 + tileWidth;
		int dstY = pBox[i].y1 + tileHeight;

		if ((dstX < pBox[i].x2) || (dstY < pBox[i].y2)) {
		    more_copy = TRUE;
		    break;
		}
	    }

	    if (more_copy == FALSE)
		ret = TRUE;

	    if (more_copy && (*pExaScr->info->PrepareCopy) (pPixmap, pPixmap,
							    1, 1, alu, planemask)) {
		for (i = 0; i < nbox; i++)
		{
		    int dstX = pBox[i].x1 + tileWidth;
		    int dstY = pBox[i].y1 + tileHeight;
		    int width = min(pBox[i].x2 - dstX, tileWidth);
		    int height = min(pBox[i].y2 - pBox[i].y1, tileHeight);

		    while (dstX < pBox[i].x2) {
			(*pExaScr->info->Copy) (pPixmap, pBox[i].x1, pBox[i].y1,
						dstX, pBox[i].y1, width, height);
			dstX += width;
			width = min(pBox[i].x2 - dstX, width * 2);
		    }

		    width = pBox[i].x2 - pBox[i].x1;
		    height = min(pBox[i].y2 - dstY, tileHeight);

		    while (dstY < pBox[i].y2) {
			(*pExaScr->info->Copy) (pPixmap, pBox[i].x1, pBox[i].y1,
						pBox[i].x1, dstY, width, height);
			dstY += height;
			height = min(pBox[i].y2 - dstY, height * 2);
		    }
		}

		(*pExaScr->info->DoneCopy) (pPixmap);

		ret = TRUE;
	    }
	}

	exaMarkSync(pDrawable->pScreen);

	if (xoff || yoff)
	    REGION_TRANSLATE(pScreen, pRegion, -xoff, -yoff);
    }

    return ret;
}


/**
 * Accelerates GetImage for solid ZPixmap downloads from framebuffer memory.
 *
 * This is probably the only case we actually care about.  The rest fall through
 * to migration and fbGetImage, which hopefully will result in migration pushing
 * the pixmap out of framebuffer.
 */
void
exaGetImage (DrawablePtr pDrawable, int x, int y, int w, int h,
	     unsigned int format, unsigned long planeMask, char *d)
{
    ExaScreenPriv (pDrawable->pScreen);
    ExaMigrationRec pixmaps[1];
    BoxRec Box;
    RegionRec Reg;
    PixmapPtr pPix;
    int xoff, yoff;
    Bool ok;

    pixmaps[0].as_dst = FALSE;
    pixmaps[0].as_src = TRUE;
    pixmaps[0].pPix = pPix = exaGetDrawablePixmap (pDrawable);
    pixmaps[0].pReg = &Reg;

    exaGetDrawableDeltas (pDrawable, pPix, &xoff, &yoff);

    Box.x1 = pDrawable->y + x + xoff;
    Box.y1 = pDrawable->y + y + yoff;
    Box.x2 = Box.x1 + w;
    Box.y2 = Box.y1 + h;

    REGION_INIT(pScreen, &Reg, &Box, 1);

    if (pExaScr->swappedOut)
	goto fallback;

    exaDoMigration(pixmaps, 1, FALSE);

    pPix = exaGetOffscreenPixmap (pDrawable, &xoff, &yoff);

    if (pPix == NULL || pExaScr->info->DownloadFromScreen == NULL)
	goto fallback;

    /* Only cover the ZPixmap, solid copy case. */
    if (format != ZPixmap || !EXA_PM_IS_SOLID(pDrawable, planeMask))
	goto fallback;

    /* Only try to handle the 8bpp and up cases, since we don't want to think
     * about <8bpp.
     */
    if (pDrawable->bitsPerPixel < 8)
	goto fallback;

    ok = pExaScr->info->DownloadFromScreen(pPix, pDrawable->x + x + xoff,
					   pDrawable->y + y + yoff, w, h, d,
					   PixmapBytePad(w, pDrawable->depth));
    if (ok) {
	exaWaitSync(pDrawable->pScreen);
	goto out;
    }

fallback:
    EXA_FALLBACK(("from %p (%c)\n", pDrawable,
		  exaDrawableLocation(pDrawable)));

    exaPrepareAccessReg (pDrawable, EXA_PREPARE_SRC, &Reg);
    fbGetImage (pDrawable, x, y, w, h, format, planeMask, d);
    exaFinishAccess (pDrawable, EXA_PREPARE_SRC);

out:
    REGION_UNINIT(pScreen, &Reg);
}