afbbitblt.c

/* $XFree86: xc/programs/Xserver/afb/afbbitblt.c,v 3.5tsi Exp $ */
/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
/***********************************************************

Copyright (c) 1987  X Consortium

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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
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******************************************************************/
/* $XConsortium: afbbitblt.c,v 5.25 94/04/17 20:28:16 dpw Exp $ */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <X11/X.h>
#include <X11/Xprotostr.h>

#include "regionstr.h"
#include "gcstruct.h"
#include "windowstr.h"
#include "pixmapstr.h"
#include "scrnintstr.h"

#include "mi.h"

#include "afb.h"
#include "maskbits.h"


static unsigned char afbRropsOS[AFB_MAX_DEPTH];

/* CopyArea and CopyPlane for a monchrome frame buffer


	clip the source rectangle to the source's available bits.  (this
avoids copying unnecessary pieces that will just get exposed anyway.)
this becomes the new shape of the destination.
	clip the destination region to the composite clip in the
GC.  this requires translating the destination region to (dstx, dsty).
	build a list of source points, one for each rectangle in the
destination.  this is a simple translation.
	go do the multiple rectangle copies
	do graphics exposures
*/
/** Optimized for drawing pixmaps into windows, especially when drawing into
 ** unobscured windows.  Calls to the general-purpose region code were
 ** replaced with rectangle-to-rectangle clipping comparisions.  This is
 ** possible, since the pixmap is a single rectangle.  In an unobscured
 ** window, the destination clip is also a single rectangle, and region
 ** code can be avoided entirely.  This is a big savings, since the region
 ** code uses XAlloc() and makes many function calls.
 **
 ** In addition, if source is a pixmap, there is no need to call the
 ** expensive miHandleExposures() routine.  Instead, we simply return NULL.
 **
 ** Previously, drawing a pixmap into an unobscured window executed at least
 ** 8 XAlloc()'s, 30 function calls, and hundreds of lines of code.
 **
 ** Now, the same operation requires no XAlloc()'s, no region function calls,
 ** and much less overhead.  Nice for drawing lots of small pixmaps.
 */

void
afbDoBitblt(pSrc, pDst, alu, prgnDst, pptSrc, planemask)
	DrawablePtr pSrc, pDst;
	int alu;
	RegionPtr prgnDst;
	DDXPointPtr pptSrc;
	unsigned long planemask;
{
	switch (alu) {
		case GXcopy:
			afbDoBitbltCopy(pSrc, pDst, alu, prgnDst, pptSrc, planemask);
			break;
		case GXxor:
			afbDoBitbltXor(pSrc, pDst, alu, prgnDst, pptSrc, planemask);
			break;
		case GXcopyInverted:
			afbDoBitbltCopyInverted(pSrc, pDst, alu, prgnDst, pptSrc, planemask);
			break;
		case GXor:
			afbDoBitbltOr(pSrc, pDst, alu, prgnDst, pptSrc, planemask);
			break;
		default:
			afbDoBitbltGeneral(pSrc, pDst, alu, prgnDst, pptSrc, planemask);
			break;
	}
}

RegionPtr
afbCopyArea(pSrcDrawable, pDstDrawable, pGC, srcx, srcy, width, height,
				 dstx, dsty)
	DrawablePtr pSrcDrawable;
	DrawablePtr pDstDrawable;
	GC *pGC;
	int srcx, srcy;
	int width, height;
	int dstx, dsty;
{
	void (*doBitBlt)();

	switch (pGC->alu) {
		case GXcopy:
			doBitBlt = afbDoBitbltCopy;
			break;
		case GXxor:
			doBitBlt = afbDoBitbltXor;
			break;
		case GXcopyInverted:
			doBitBlt = afbDoBitbltCopyInverted;
			break;
		case GXor:
			doBitBlt = afbDoBitbltOr;
			break;
		default:
			doBitBlt = afbDoBitbltGeneral;
			break;
	}

	return(afbBitBlt(pSrcDrawable, pDstDrawable, pGC, srcx, srcy,
			 width, height, dstx, dsty, doBitBlt, pGC->planemask));
}

RegionPtr
afbBitBlt(pSrcDrawable, pDstDrawable, pGC, srcx, srcy, width, height,
			  dstx, dsty, doBitBlt, planemask)
	register DrawablePtr pSrcDrawable;
	register DrawablePtr pDstDrawable;
	register GC *pGC;
	int srcx, srcy;
	int width, height;
	int dstx, dsty;
	void (*doBitBlt)();
	unsigned long planemask;
{
	RegionPtr prgnSrcClip = NULL;		/* may be a new region, or just a copy */
	Bool freeSrcClip = FALSE;

	RegionPtr prgnExposed;
	RegionRec rgnDst;
	DDXPointPtr pptSrc;
	register DDXPointPtr ppt;
	register BoxPtr pbox;
	int i;
	register int dx;
	register int dy;
	xRectangle origSource;
	DDXPointRec origDest;
	int numRects;
	BoxRec fastBox;
	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 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->alu, &rgnDst, pptSrc,
					 planemask);

		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, (unsigned long)0);
	}
	REGION_UNINIT(pGC->pScreen, &rgnDst);
	if (freeSrcClip)
		REGION_DESTROY(pGC->pScreen, prgnSrcClip);
	return prgnExposed;
}

RegionPtr
afbCopyPlane(pSrcDrawable, pDstDrawable, pGC, srcx, srcy, width, height,
			 dstx, dsty, plane)
DrawablePtr pSrcDrawable, pDstDrawable;
register GC *pGC;
int srcx, srcy;
int width, height;
int dstx, dsty;
unsigned long plane;
{
	int alu;
	RegionPtr		prgnExposed = NULL;
	unsigned long old_planemask;

	if (pDstDrawable->depth == 1) {
		old_planemask = pGC->planemask;
		pGC->planemask = plane;
		if ((pGC->fgPixel & 1) == 1 && (pGC->bgPixel & 1) == 0) {
			prgnExposed = (*pGC->ops->CopyArea)(pSrcDrawable, pDstDrawable,
							 pGC, srcx, srcy, width, height, dstx, dsty);
		} else if ((pGC->fgPixel & 1) == (pGC->bgPixel & 1)) {
			unsigned char rop;

			afbReduceRop(pGC->alu, pGC->fgPixel, 1, 1, &rop);
			alu = pGC->alu;
			pGC->alu = rop;
			prgnExposed = (*pGC->ops->CopyArea)(pSrcDrawable, pDstDrawable, pGC,
															srcx, srcy, width, height, dstx,
															dsty);
			pGC->alu = alu;
		} else { /* need to invert the src */
			alu = pGC->alu;
			pGC->alu = afbInverseAlu[alu];
			prgnExposed = (*pGC->ops->CopyArea)(pSrcDrawable, pDstDrawable, pGC,
															srcx, srcy, width, height, dstx,
															dsty);
			pGC->alu = alu;
		}
		pGC->planemask = old_planemask;
	} else {
		int free_pixmap = FALSE;
		PixmapPtr pBitmap = (PixmapPtr)pSrcDrawable;
		ScreenPtr pScreen = pSrcDrawable->pScreen;
		GCPtr pGC1 = NULL;

		if (pSrcDrawable == pDstDrawable ||
			pSrcDrawable->type == DRAWABLE_WINDOW || pSrcDrawable->depth != 1) {
			/* Copy a plane from source drawable to a tmp 1-bit deep pixmap */
			/* XXX: Range check width and height */
			pBitmap = (*pScreen->CreatePixmap)(pScreen, width, height, 1);

			if (!pBitmap)
				return(NULL);
			pGC1 = GetScratchGC(1, pScreen);
			if (!pGC1) {
				(*pScreen->DestroyPixmap)(pBitmap);
				return(NULL);
			}
			ValidateGC((DrawablePtr)pBitmap, pGC1);
			(void)afbBitBlt(pSrcDrawable, (DrawablePtr)pBitmap, pGC1, srcx, srcy,
								  width, height, 0, 0, afbDoBitbltCopy, plane);
			free_pixmap = TRUE;
		}
#if 0
		else {
			/* XXX: could cope with N-deep pixmap source case without using tmp
			 * src bitmap by setting up a scratch pixmap header and fiddle
			 * around with the pbits pointer.
			 */
		}
#endif
		afbReduceOpaqueStipple(pGC->fgPixel, pGC->bgPixel, pGC->planemask,
										pGC->depth, afbRropsOS);
		(void)afbBitBlt((DrawablePtr)pBitmap, pDstDrawable, pGC, 0, 0, width,
							  height, dstx, dsty, afbCopy1ToN, pGC->planemask);
		if (free_pixmap) {
			(*pScreen->DestroyPixmap)(pBitmap);
			FreeScratchGC(pGC1);
		}

		if (pGC->fExpose)
			prgnExposed = miHandleExposures(pSrcDrawable, pDstDrawable, pGC, srcx,
													  srcy, width, height, dstx, dsty,
													  plane);
	}
	return prgnExposed;
}

void
afbCopy1ToN(pSrc, pDst, alu, prgnDst, pptSrc, planemask)
	DrawablePtr pSrc, pDst;
	int alu;
	RegionPtr prgnDst;
	DDXPointPtr pptSrc;
	unsigned long planemask;
{
	int numRects = REGION_NUM_RECTS(prgnDst);
	BoxPtr pbox = REGION_RECTS(prgnDst);
	int r;

	for (r = 0; r < numRects; r++, pbox++, pptSrc++) {
		int dx = pptSrc->x;
		int dy = pptSrc->y;

		if (alu == GXcopy)
			afbOpaqueStippleAreaCopy(pDst, 1, pbox, alu, (PixmapPtr)pSrc, dx, dy,
											  afbRropsOS, planemask);
		else
			afbOpaqueStippleAreaGeneral(pDst, 1, pbox, alu, (PixmapPtr)pSrc, dx,
												  dy, afbRropsOS, planemask);
	}
}