cfbpixmap.c

早期freebsd实现

/* $XConsortium: cfbpixmap.c,v 5.7 91/07/18 23:36:46 keith Exp $ */
/***********************************************************
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, 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 names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL 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.

******************************************************************/
/* pixmap management
   written by drewry, september 1986

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

#include "Xmd.h"
#include "servermd.h"
#include "pixmapstr.h"
#include "cfbmskbits.h"

#include "cfb.h"
#include "mi.h"
#include "scrnintstr.h"
#include "gcstruct.h"

extern void mfbXRotatePixmap(), mfbYRotatePixmap();

#if (BITMAP_BIT_ORDER == MSBFirst)
static int masktab[32] = 
    {
        0x00000000,
        0x80000000,
        0xC0000000,
        0xE0000000,
        0xF0000000,
        0xF8000000,
        0xFC000000,
        0xFE000000,
        0xFF000000,
        0xFF800000,
        0xFFC00000,
        0xFFE00000,
        0xFFF00000,
        0xFFF80000,
        0xFFFC0000,
        0xFFFE0000,
        0xFFFF0000,
        0xFFFF8000,
        0xFFFFC000,
        0xFFFFE000,
        0xFFFFF000,
        0xFFFFF800,
        0xFFFFFC00,
        0xFFFFFE00,
        0xFFFFFF00,
        0xFFFFFF80,
        0xFFFFFFC0,
        0xFFFFFFE0,
        0xFFFFFFF0,
        0xFFFFFFF8,
        0xFFFFFFFC,
        0xFFFFFFFE
    };
#else
static int masktab[32] =
        {
        0x00000000,
        0x00000001,
        0x00000003,
        0x00000007,
        0x0000000F,
        0x0000001F,
        0x0000003F,
        0x0000007F,
        0x000000FF,
        0x000001FF,
        0x000003FF,
        0x000007FF,
        0x00000FFF,
        0x00001FFF,
        0x00003FFF,
        0x00007FFF,
        0x0000FFFF,
        0x0001FFFF,
        0x0003FFFF,
        0x0007FFFF,
        0x000FFFFF,
        0x001FFFFF,
        0x003FFFFF,
        0x007FFFFF,
        0x00FFFFFF,
        0x01FFFFFF,
        0x03FFFFFF,
        0x07FFFFFF,
        0x0FFFFFFF,
        0x1FFFFFFF,
        0x3FFFFFFF,
        0x7FFFFFFF
        };
#endif

PixmapPtr
cfbCreatePixmap (pScreen, width, height, bitsPerPixel)
    ScreenPtr	pScreen;
    int		width;
    int		height;
    int		bitsPerPixel;
{
    register PixmapPtr pPixmap;
    register hpPrivPixmapPtr pPrivPixmap;
    int size;

    if (bitsPerPixel != 1 && bitsPerPixel != PSZ)
	return NullPixmap;

    pPixmap = (PixmapPtr) xalloc(sizeof(PixmapRec) + sizeof(hpPrivPixmap));
    if (!pPixmap)
	return NullPixmap;
    pPixmap->devPrivate.ptr = (pointer)(pPixmap+1);
    pPixmap->drawable.type = DRAWABLE_PIXMAP;
    pPixmap->drawable.class = 0;
    pPixmap->drawable.pScreen = pScreen;
    pPixmap->drawable.depth = bitsPerPixel;
    pPixmap->drawable.bitsPerPixel = bitsPerPixel;
    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->refcnt = 1;

    pPrivPixmap = (hpPrivPixmapPtr) pPixmap->devPrivate.ptr;
    pPrivPixmap->stride = PixmapBytePad(width, bitsPerPixel);

    if ((bitsPerPixel == PSZ) &&
        (pPrivPixmap->pChunk = hpBufAlloc(pScreen, pPrivPixmap->stride, height)))
    {
        pPrivPixmap->stride =
            ((hpPrivScreenPtr)(pScreen->devPrivate))->stride;

        pPixmap->devKind = PIXMAP_FRAME_BUFFER;
        pPrivPixmap->bits = (pointer)
            (((hpPrivScreenPtr)(pScreen->devPrivate))->bits) +
		(pPrivPixmap->pChunk->y * pPrivPixmap->stride) +
		    pPrivPixmap->pChunk->x;
    }
    else                      /* depth == 1 or no off-screen memory */
    {
        pPixmap->devKind = PIXMAP_HOST_MEMORY;
        size = height * pPrivPixmap->stride;
        if ( !(pPrivPixmap->bits = (pointer)xalloc(size)))
        {
	    xfree(pPixmap);
	    return NullPixmap;
	}
	else
	    bzero((char *)pPrivPixmap->bits, size);
    }
    return pPixmap;
}

PixmapPtr
cfbCreateOffscreenPixmap (pScreen, width, height, bitsPerPixel)
    ScreenPtr	pScreen;
    int		width;
    int		height;
    int		bitsPerPixel;
{
    register PixmapPtr pPixmap;
    register hpPrivPixmapPtr pPrivPixmap;
    int size;

    if (bitsPerPixel != PSZ)
	return NullPixmap;

    pPixmap = (PixmapPtr) xalloc(sizeof(PixmapRec) + sizeof(hpPrivPixmap));
    if (!pPixmap)
	return NullPixmap;
    pPixmap->devPrivate.ptr = (pointer)(pPixmap+1);
    pPixmap->drawable.type = DRAWABLE_PIXMAP;
    pPixmap->drawable.class = 0;
    pPixmap->drawable.pScreen = pScreen;
    pPixmap->drawable.depth = bitsPerPixel;
    pPixmap->drawable.bitsPerPixel = bitsPerPixel;
    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->refcnt = 1;

    pPrivPixmap = (hpPrivPixmapPtr) pPixmap->devPrivate.ptr;
    pPrivPixmap->stride = PixmapBytePad(width, bitsPerPixel);

    if ((pPrivPixmap->pChunk = hpBufAlloc(pScreen, pPrivPixmap->stride, height)))
    {
        pPrivPixmap->stride =
            ((hpPrivScreenPtr)(pScreen->devPrivate))->stride;
	
        pPixmap->devKind = PIXMAP_FRAME_BUFFER;
        pPrivPixmap->bits = (pointer)
            (((hpPrivScreenPtr)(pScreen->devPrivate))->bits) +
		(pPrivPixmap->pChunk->y * pPrivPixmap->stride) +
		    pPrivPixmap->pChunk->x;
    }
    else                      /* Cannot create offscreen pixmap */
    {
	xfree(pPixmap);
	return NullPixmap;
    }
    return pPixmap;
}

Bool
cfbDestroyPixmap(pPixmap)
    PixmapPtr pPixmap;
{
    /* BOGOSITY ALERT */
    if ((unsigned) pPixmap < 42)
	return TRUE;

    if(--pPixmap->refcnt)
	return TRUE;

    if (pPixmap->devKind == PIXMAP_FRAME_BUFFER)
        hpBufFree (pPixmap->drawable.pScreen,
		   ((hpPrivPixmapPtr)pPixmap->devPrivate.ptr)->pChunk);
    else
	xfree(((hpPrivPixmapPtr)pPixmap->devPrivate.ptr)->bits);

    xfree(pPixmap);
    return TRUE;
}

PixmapPtr
cfbCopyPixmap(pSrc)
    register PixmapPtr	pSrc;
{
    register PixmapPtr	pDst;
    register int		*pSrcInt, *pDstInt, *pSrcI, *pDstI, *pDstMax;
    register hpPrivPixmapPtr	pPrivDst, pPrivSrc;
    int				copyWords, i;
    void			(*bitMover)();

    pDst = cfbCreatePixmap(pSrc->drawable.pScreen, pSrc->drawable.width,
			   pSrc->drawable.height, pSrc->drawable.bitsPerPixel);
    if (!pDst)
	return NullPixmap;

    pPrivSrc = (hpPrivPixmapPtr) pSrc->devPrivate.ptr;
    pPrivDst = (hpPrivPixmapPtr) pDst->devPrivate.ptr;

    pSrcInt = (int *)pPrivSrc->bits;
    pDstInt = (int *)pPrivDst->bits;
    if (pSrc->drawable.depth == 1)
    {                         /* bit per pixel */
	pDstMax = pDstInt + ((pDst->drawable.height * pPrivDst->stride) >> 2);
        /* Copy words */
        while(pDstInt < pDstMax)
	    *pDstInt++ = *pSrcInt++;
    }
    else
    {                         /* byte per pixel */
        if ((pSrc->devKind == PIXMAP_FRAME_BUFFER) &&
            (pDst->devKind == PIXMAP_FRAME_BUFFER))
	{
            bitMover = ((hpPrivScreenPtr)
                        (pSrc->drawable.pScreen->devPrivate))->MoveBits;
            (*bitMover)(pSrc->drawable.pScreen, ~0, GXcopy,
                        pPrivSrc->pChunk->x,
                        pPrivSrc->pChunk->y,
                        pPrivDst->pChunk->x,
                        pPrivDst->pChunk->y,
                        pSrc->drawable.width, pSrc->drawable.height);
        }
        else
	{
            if (pSrc->devKind == PIXMAP_FRAME_BUFFER)
                WAIT_READY_TO_RENDER(pSrc->drawable.pScreen);
            if (pDst->devKind == PIXMAP_FRAME_BUFFER)
                SET_REGISTERS_FOR_WRITING(pDst->drawable.pScreen, ~0, GXcopy);
            copyWords = (pDst->drawable.width + 3) >> 2; /* width will be in bytes */
            for (i=0;
                 i < pDst->drawable.height;
                 pSrcInt = (int *)((char *)pSrcInt + pPrivSrc->stride),
                 pDstInt = (int *)((char *)pDstInt + pPrivDst->stride),
                 i++)
	    {
                pDstMax = pDstInt + copyWords;
                pSrcI = pSrcInt;
                pDstI = pDstInt;
                while (pDstI < pDstMax)
                    *pDstI++ = *pSrcI++;
            }
        }
    }

    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
	cfbXRotatePixmap code gets used if we rotate the pixmap later.
	cfbYRotatePixmap 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
cfbPadPixmap(pPixmap)
    PixmapPtr pPixmap;
{
    register int width = (pPixmap->drawable.width) * (pPixmap->drawable.bitsPerPixel);
    register int h;
    register int mask;
    register unsigned int *p;
    register unsigned int bits; /* real pattern bits */
    register int i;
    int rep;                    /* repeat count for pattern */
    int stride;