xserver/ilbm/ilbmpixmap.c

/* $XFree86: xc/programs/Xserver/ilbm/ilbmpixmap.c,v 3.0 1996/08/18 01:54:01 dawes Exp $ */
/***********************************************************

Copyright (c) 1987  X Consortium

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all copies or substantial portions of the Software.

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in this Software without prior written authorization from the X Consortium.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
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 Digital not be
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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******************************************************************/
/* $XConsortium: ilbmpixmap.c,v 5.13 94/04/17 20:28:28 dpw Exp $ */

/* pixmap management
   written by drewry, september 1986

   on a monchrome device, a pixmap is a bitmap.
*/

/* Modified jun 95 by Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
   to use interleaved bitplanes instead of normal bitplanes */

#include "Xmd.h"
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "maskbits.h"

#include "ilbm.h"
#include "mi.h"

#include "servermd.h"

PixmapPtr
ilbmCreatePixmap(pScreen, width, height, depth)
	ScreenPtr		pScreen;
	int				width;
	int				height;
	int				depth;
{
	PixmapPtr pPixmap;
	int datasize;
	int paddedWidth;

	paddedWidth = BitmapBytePad(width);
	datasize = height * paddedWidth * depth;
	pPixmap = AllocatePixmap(pScreen, datasize);
	if (!pPixmap)
		return(NullPixmap);
	pPixmap->drawable.type = DRAWABLE_PIXMAP;
	pPixmap->drawable.class = 0;
	pPixmap->drawable.pScreen = pScreen;
	pPixmap->drawable.depth = depth;
	pPixmap->drawable.bitsPerPixel = depth;
	pPixmap->drawable.id = 0;
	pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER;
	pPixmap->drawable.x = 0;
	pPixmap->drawable.y = 0;
	pPixmap->drawable.width = width;
	pPixmap->drawable.height = height;
	pPixmap->devKind = paddedWidth;
	pPixmap->refcnt = 1;
#ifdef PIXPRIV
	pPixmap->devPrivate.ptr =  datasize ?
				(pointer)((char *)pPixmap + pScreen->totalPixmapSize) : NULL;
#else
	pPixmap->devPrivate.ptr = (pointer)(pPixmap + 1);
#endif
	return(pPixmap);
}

Bool
ilbmDestroyPixmap(pPixmap)
	PixmapPtr pPixmap;
{
	if (--pPixmap->refcnt)
		return(TRUE);
	xfree(pPixmap);
	return(TRUE);
}


PixmapPtr
ilbmCopyPixmap(pSrc)
	register PixmapPtr pSrc;
{
	register PixmapPtr pDst;
	int size;
	ScreenPtr pScreen;

	size = pSrc->drawable.height * pSrc->devKind * pSrc->drawable.depth;
	pScreen = pSrc->drawable.pScreen;
	pDst = (*pScreen->CreatePixmap)(pScreen, pSrc->drawable.width,
											  pSrc->drawable.height, pSrc->drawable.depth);
	if (!pDst)
		return(NullPixmap);
	memmove((char *)pDst->devPrivate.ptr, (char *)pSrc->devPrivate.ptr, size);
	return(pDst);
}


/* replicates a pattern to be a full 32 bits wide.
   relies on the fact that each scnaline is longword padded.
   doesn't do anything if pixmap is not a factor of 32 wide.
   changes width field of pixmap if successful, so that the fast
		XRotatePixmap code gets used if we rotate the pixmap later.

   calculate number of times to repeat
   for each scanline of pattern
	  zero out area to be filled with replicate
	  left shift and or in original as many times as needed
*/
void
ilbmPadPixmap(pPixmap)
	PixmapPtr pPixmap;
{
	register int width = pPixmap->drawable.width;
	register int h;
	register PixelType mask;
	register PixelType *p;
	register PixelType bits;		/* real pattern bits */
	register int i;
	int d;
	int rep;						/* repeat count for pattern */

	if (width >= PPW)
		return;

	rep = PPW/width;
	if (rep*width != PPW)
		return;

	mask = endtab[width];

	p = (PixelType *)(pPixmap->devPrivate.ptr);

	for (d = 0; d < pPixmap->drawable.depth; d++) {
		for (h = 0; h < pPixmap->drawable.height; h++) {
			*p &= mask;
			bits = *p;
			for (i = 1; i < rep; i++) {
				bits = SCRRIGHT(bits, width);
				*p |= bits;
			}
			p++;
		}
	}
	pPixmap->drawable.width = PPW;
}

/* Rotates pixmap pPix by w pixels to the right on the screen. Assumes that
 * words are PPW bits wide, and that the least significant bit appears on the
 * left.
 */
void
ilbmXRotatePixmap(pPix, rw)
	PixmapPtr		pPix;
	register int rw;
{
	register PixelType		*pw, *pwFinal;
	register PixelType		t;

	if (pPix == NullPixmap)
		return;

	pw = (PixelType *)pPix->devPrivate.ptr;
	rw %= (int)pPix->drawable.width;
	if (rw < 0)
		rw += (int)pPix->drawable.width;
	if (pPix->drawable.width == PPW) {
		pwFinal = pw + pPix->drawable.height * pPix->drawable.depth;
		while (pw < pwFinal) {
			t = *pw;
			*pw++ = SCRRIGHT(t, rw) | (SCRLEFT(t, (PPW-rw)) & endtab[rw]);
		}
	} else {
		/* We no longer do this.  Validate doesn't try to rotate odd-size
		 * tiles or stipples.  ilbmUnnatural<tile/stipple>FS works directly off
		 * the unrotate tile/stipple in the GC
		 */
		ErrorF("X internal error: trying to rotate odd-sized pixmap.\n");
	}

}

/* Rotates pixmap pPix by h lines.  Assumes that h is always less than
   pPix->height
   works on any width.
 */
void
ilbmYRotatePixmap(pPix, rh)
	register PixmapPtr		pPix;
	int		rh;
{
	int nbyDown;		/* bytes to move down to row 0; also offset of
								row rh */
	int nbyUp;			/* bytes to move up to line rh; also
								offset of first line moved down to 0 */
	char *pbase;
	char *ptmp;
	int height;
	int aux;

	if (pPix == NullPixmap)
		return;
	height = (int) pPix->drawable.height;
	rh %= height;
	if (rh < 0)
		rh += height;

	aux = pPix->devKind*pPix->drawable.depth;
	nbyDown = rh*aux;
	nbyUp = height*aux-nbyDown;

	if (!(ptmp = (char *)ALLOCATE_LOCAL(nbyUp)))
		return;

	pbase = (char *)pPix->devPrivate.ptr;
	memmove(ptmp, pbase, nbyUp);					/* save the low rows */
	memmove(pbase, pbase+nbyUp, nbyDown);		/* slide the top rows down */
	memmove(pbase+nbyDown, ptmp, nbyUp);		/* move lower rows up to row rh */
	DEALLOCATE_LOCAL(ptmp);
}

void
ilbmCopyRotatePixmap(psrcPix, ppdstPix, xrot, yrot)
	register PixmapPtr psrcPix, *ppdstPix;
	int		xrot, yrot;
{
	register PixmapPtr pdstPix;

	if ((pdstPix = *ppdstPix) && (pdstPix->devKind == psrcPix->devKind) &&
		(pdstPix->drawable.height == psrcPix->drawable.height) &&
		(pdstPix->drawable.depth == psrcPix->drawable.depth)) {
		memmove((char *)pdstPix->devPrivate.ptr, (char *)psrcPix->devPrivate.ptr,
				  psrcPix->drawable.height * psrcPix->devKind *
				  psrcPix->drawable.depth);
		pdstPix->drawable.width = psrcPix->drawable.width;
		pdstPix->drawable.serialNumber = NEXT_SERIAL_NUMBER;
	} else {
		if (pdstPix)
			/* FIX XBUG 6168 */
			(*pdstPix->drawable.pScreen->DestroyPixmap)(pdstPix);
		*ppdstPix = pdstPix = ilbmCopyPixmap(psrcPix);
		if (!pdstPix)
			return;
	}
	ilbmPadPixmap(pdstPix);
	if (xrot)
		ilbmXRotatePixmap(pdstPix, xrot);
	if (yrot)
		ilbmYRotatePixmap(pdstPix, yrot);
}