xref: /xsrc/external/mit/xorg-server/dist/fb/fbsolid.c

/*
 * Copyright © 1998 Keith Packard
 *
 * 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.
 */

#define FbSelectPart(xor,o,t)    xor

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

#include "fb.h"

void
fbSolid (FbBits	    *dst,
	 FbStride   dstStride,
	 int	    dstX,
	 int	    bpp,

	 int	    width,
	 int	    height,

	 FbBits	    and,
	 FbBits	    xor)
{
    FbBits  startmask, endmask;
    int	    n, nmiddle;
    int	    startbyte, endbyte;

#ifdef FB_24BIT
    if (bpp == 24 && (!FbCheck24Pix(and) || !FbCheck24Pix(xor)))
    {
	fbSolid24 (dst, dstStride, dstX, width, height, and, xor);
	return;
    }
#endif
    dst += dstX >> FB_SHIFT;
    dstX &= FB_MASK;
    FbMaskBitsBytes(dstX, width, and == 0, startmask, startbyte,
		    nmiddle, endmask, endbyte);
    if (startmask)
	dstStride--;
    dstStride -= nmiddle;
    while (height--)
    {
	if (startmask)
	{
	    FbDoLeftMaskByteRRop(dst,startbyte,startmask,and,xor);
	    dst++;
	}
	n = nmiddle;
	if (!and)
	    while (n--)
		WRITE(dst++, xor);
	else
	    while (n--)
	    {
		WRITE(dst, FbDoRRop (READ(dst), and, xor));
                dst++;
	    }
	if (endmask)
	    FbDoRightMaskByteRRop(dst,endbyte,endmask,and,xor);
	dst += dstStride;
    }
}

#ifdef FB_24BIT
void
fbSolid24 (FbBits   *dst,
	   FbStride dstStride,
	   int	    dstX,

	   int	    width,
	   int	    height,

	   FbBits   and,
	   FbBits   xor)
{
    FbBits  startmask, endmask;
    FbBits  xor0 = 0, xor1 = 0, xor2 = 0;
    FbBits  and0 = 0, and1 = 0, and2 = 0;
    FbBits  xorS = 0, andS = 0, xorE = 0, andE = 0;
    int	    n, nmiddle;
    int	    rotS, rot;

    dst += dstX >> FB_SHIFT;
    dstX &= FB_MASK;
    /*
     * Rotate pixel values this far across the word to align on
     * screen pixel boundaries
     */
    rot = FbFirst24Rot (dstX);
    FbMaskBits (dstX, width, startmask, nmiddle, endmask);
    if (startmask)
	dstStride--;
    dstStride -= nmiddle;

    /*
     * Precompute rotated versions of the rasterop values
     */
    rotS = rot;
    xor = FbRot24(xor,rotS);
    and = FbRot24(and,rotS);
    if (startmask)
    {
	xorS = xor;
	andS = and;
	xor = FbNext24Pix(xor);
	and = FbNext24Pix(and);
    }

    if (nmiddle)
    {
	xor0 = xor;
	and0 = and;
	xor1 = FbNext24Pix(xor0);
	and1 = FbNext24Pix(and0);
	xor2 = FbNext24Pix(xor1);
	and2 = FbNext24Pix(and1);
    }

    if (endmask)
    {
	switch (nmiddle % 3) {
	case 0:
	    xorE = xor;
	    andE = and;
	    break;
	case 1:
	    xorE = xor1;
	    andE = and1;
	    break;
	case 2:
	    xorE = xor2;
	    andE = and2;
	    break;
	}
    }

    while (height--)
    {
	if (startmask)
	{
	    WRITE(dst, FbDoMaskRRop(READ(dst), andS, xorS, startmask));
            dst++;
	}
	n = nmiddle;
	if (!and0)
	{
	    while (n >= 3)
	    {
		WRITE(dst++, xor0);
		WRITE(dst++, xor1);
		WRITE(dst++, xor2);
		n -= 3;
	    }
	    if (n)
	    {
		WRITE(dst++, xor0);
		n--;
		if (n)
		{
		    WRITE(dst++, xor1);
		}
	    }
	}
	else
	{
	    while (n >= 3)
	    {
		WRITE(dst, FbDoRRop (READ(dst), and0, xor0));
                dst++;
		WRITE(dst, FbDoRRop (READ(dst), and1, xor1));
                dst++;
		WRITE(dst, FbDoRRop (READ(dst), and2, xor2));
                dst++;
		n -= 3;
	    }
	    if (n)
	    {
		WRITE(dst, FbDoRRop (READ(dst), and0, xor0));
                dst++;
		n--;
		if (n)
		{
		    WRITE(dst, FbDoRRop (READ(dst), and1, xor1));
                    dst++;
		}
	    }
	}
	if (endmask)
	    WRITE(dst, FbDoMaskRRop (READ(dst), andE, xorE, endmask));
	dst += dstStride;
    }
}
#endif