/* $XFree86: xc/programs/Xserver/hw/xfree86/xaa/xaaBitBlt.c,v 1.3tsi Exp $ */

/* 
   This is a lighter version of cfbBitBlt.  We calculate the boxes
   when accelerating pixmap->screen and screen->screen copies. 
   We also pass the GC to the doBitBlt function so that it has access
   to the fg and bg so CopyPlane can use this. 
*/

#include <X11/misc.h>
#include "xf86.h"
#include "xf86_ansic.h"
#include "xf86_OSproc.h"

#include <X11/X.h>
#include "mi.h"
#include "pixmapstr.h"
#include "gcstruct.h"
#include "windowstr.h"
#include "xaalocal.h"


RegionPtr
XAABitBlt(
    DrawablePtr pSrcDrawable,
    DrawablePtr pDstDrawable,
    GC *pGC,
    int srcx, int srcy,
    int width, int height,
    int dstx, int dsty,
    void (*doBitBlt)(DrawablePtr, DrawablePtr, GCPtr, RegionPtr, DDXPointPtr),
    unsigned long bitPlane )
{

    RegionPtr prgnSrcClip = NULL; /* may be a new region, or just a copy */
    RegionPtr prgnExposed;
    Bool freeSrcClip = FALSE;
    RegionRec rgnDst;
    DDXPointPtr pptSrc, ppt;
    DDXPointRec origDest;
    BoxPtr pbox;
    BoxRec fastBox;
    int i, dx, dy, numRects;
    xRectangle origSource;
    int fastClip = 0;		/* for fast clipping with pixmap source */
    int fastExpose = 0;		/* for fast exposures with pixmap source */

    origSource.x = srcx;
    origSource.y = srcy;
    origSource.width = width;
    origSource.height = height;
    origDest.x = dstx;
    origDest.y = dsty;

    if((pSrcDrawable != pDstDrawable) && 
			pSrcDrawable->pScreen->SourceValidate) {
	(*pSrcDrawable->pScreen->SourceValidate) (
			pSrcDrawable, srcx, srcy, width, height);
    }

    srcx += pSrcDrawable->x;
    srcy += pSrcDrawable->y;

    /* clip the source */
    if (pSrcDrawable->type == DRAWABLE_PIXMAP) {
	if ((pSrcDrawable == pDstDrawable) && (pGC->clientClipType == CT_NONE))
	    prgnSrcClip = pGC->pCompositeClip;
	else
	    fastClip = 1;
    } else {	/* Window */
	if (pGC->subWindowMode == IncludeInferiors) {
	    if (!((WindowPtr) pSrcDrawable)->parent) {
		/*
		 * special case bitblt from root window in
		 * IncludeInferiors mode; just like from a pixmap
		 */
		fastClip = 1;
	    } else if ((pSrcDrawable == pDstDrawable) &&
		(pGC->clientClipType == CT_NONE)) {
		prgnSrcClip = pGC->pCompositeClip;
	    } else {
		prgnSrcClip = NotClippedByChildren((WindowPtr)pSrcDrawable);
		freeSrcClip = TRUE;
	    }
	} else {
	    prgnSrcClip = &((WindowPtr)pSrcDrawable)->clipList;
	}
    }

    fastBox.x1 = srcx;
    fastBox.y1 = srcy;
    fastBox.x2 = srcx + width;
    fastBox.y2 = srcy + height;

    /* Don't create a source region if we are doing a fast clip */
    if (fastClip) {
	fastExpose = 1;
	/*
	 * clip the source; if regions extend beyond the source size,
 	 * make sure exposure events get sent
	 */
	if (fastBox.x1 < pSrcDrawable->x) {
	    fastBox.x1 = pSrcDrawable->x;
	    fastExpose = 0;
	} 
	if (fastBox.y1 < pSrcDrawable->y) {
	    fastBox.y1 = pSrcDrawable->y;
	    fastExpose = 0;
	}
	if (fastBox.x2 > pSrcDrawable->x + (int) pSrcDrawable->width) {
	    fastBox.x2 = pSrcDrawable->x + (int) pSrcDrawable->width;
	    fastExpose = 0;
	}
	if (fastBox.y2 > pSrcDrawable->y + (int) pSrcDrawable->height) {
	    fastBox.y2 = pSrcDrawable->y + (int) pSrcDrawable->height;
	    fastExpose = 0;
	}
    } else {
	REGION_INIT(pGC->pScreen, &rgnDst, &fastBox, 1);
	REGION_INTERSECT(pGC->pScreen, &rgnDst, &rgnDst, prgnSrcClip);
    }

    dstx += pDstDrawable->x;
    dsty += pDstDrawable->y;

    if (pDstDrawable->type == DRAWABLE_WINDOW) {
	if (!((WindowPtr)pDstDrawable)->realized) {
	    if (!fastClip)
		REGION_UNINIT(pGC->pScreen, &rgnDst);
	    if (freeSrcClip)
		REGION_DESTROY(pGC->pScreen, prgnSrcClip);
	    return NULL;
	}
    }

    dx = srcx - dstx;
    dy = srcy - dsty;

    /* Translate and clip the dst to the destination composite clip */
    if (fastClip) {
	RegionPtr cclip;

        /* Translate the region directly */
        fastBox.x1 -= dx;
        fastBox.x2 -= dx;
        fastBox.y1 -= dy;
        fastBox.y2 -= dy;

	/* If the destination composite clip is one rectangle we can
	   do the clip directly.  Otherwise we have to create a full
	   blown region and call intersect */

	cclip = pGC->pCompositeClip;
        if (REGION_NUM_RECTS(cclip) == 1) {
	    BoxPtr pBox = REGION_RECTS(cclip);

	    if (fastBox.x1 < pBox->x1) fastBox.x1 = pBox->x1;
	    if (fastBox.x2 > pBox->x2) fastBox.x2 = pBox->x2;
	    if (fastBox.y1 < pBox->y1) fastBox.y1 = pBox->y1;
	    if (fastBox.y2 > pBox->y2) fastBox.y2 = pBox->y2;

	    /* Check to see if the region is empty */
	    if (fastBox.x1 >= fastBox.x2 || fastBox.y1 >= fastBox.y2) {
		REGION_NULL(pGC->pScreen, &rgnDst);
	    } else {
		REGION_INIT(pGC->pScreen, &rgnDst, &fastBox, 1);
	    }
	} else {
	    /* We must turn off fastClip now, since we must create
	       a full blown region.  It is intersected with the
	       composite clip below. */
	    fastClip = 0;
	    REGION_INIT(pGC->pScreen, &rgnDst, &fastBox,1);
	}
    } else {
        REGION_TRANSLATE(pGC->pScreen, &rgnDst, -dx, -dy);
    }

    if (!fastClip) {
	REGION_INTERSECT(pGC->pScreen, &rgnDst, &rgnDst,
				 pGC->pCompositeClip);
    }

    /* Do bit blitting */
    numRects = REGION_NUM_RECTS(&rgnDst);
    if (numRects && width && height) {
	if(!(pptSrc = (DDXPointPtr)ALLOCATE_LOCAL(numRects *
						  sizeof(DDXPointRec)))) {
	    REGION_UNINIT(pGC->pScreen, &rgnDst);
	    if (freeSrcClip)
		REGION_DESTROY(pGC->pScreen, prgnSrcClip);
	    return NULL;
	}
	pbox = REGION_RECTS(&rgnDst);
	ppt = pptSrc;
	for (i = numRects; --i >= 0; pbox++, ppt++) {
	    ppt->x = pbox->x1 + dx;
	    ppt->y = pbox->y1 + dy;
	}

	(*doBitBlt) (pSrcDrawable, pDstDrawable, pGC, &rgnDst, pptSrc);
	DEALLOCATE_LOCAL(pptSrc);
    }

    prgnExposed = NULL;
    if (pGC->fExpose) {
        /* Pixmap sources generate a NoExposed (we return NULL to do this) */
        if (!fastExpose)
	    prgnExposed = miHandleExposures(pSrcDrawable, pDstDrawable, pGC,
				  origSource.x, origSource.y,
				  (int)origSource.width,
				  (int)origSource.height,
				  origDest.x, origDest.y, bitPlane);
    }
    REGION_UNINIT(pGC->pScreen, &rgnDst);
    if (freeSrcClip)
	REGION_DESTROY(pGC->pScreen, prgnSrcClip);
    return prgnExposed;
}