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;

    if (bpp == 24 && (!FbCheck24Pix(and) || !FbCheck24Pix(xor))) {
        fbSolid24(dst, dstStride, dstX, width, height, and, xor);
        return;
    }
    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;
    }
}

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;
    }
}