xserver/fb/fbtile.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.
 */

#include <dix-config.h>

#include "fb.h"

/*
 * Accelerated tile fill -- tile width is a power of two not greater
 * than FB_UNIT
 */

void
fbEvenTile(FbBits * dst,
           FbStride dstStride,
           int dstX,
           int width,
           int height,
           FbBits * tile,
           FbStride tileStride,
           int tileHeight, int alu, FbBits pm, int xRot, int yRot)
{
    FbBits *t, *tileEnd, bits;
    FbBits startmask, endmask;
    FbBits and, xor;
    int n, nmiddle;
    int tileX, tileY;
    int rot;
    int startbyte, endbyte;

    dst += dstX >> FB_SHIFT;
    dstX &= FB_MASK;
    FbMaskBitsBytes(dstX, width, FbDestInvarientRop(alu, pm),
                    startmask, startbyte, nmiddle, endmask, endbyte);
    if (startmask)
        dstStride--;
    dstStride -= nmiddle;

    /*
     * Compute tile start scanline and rotation parameters
     */
    tileEnd = tile + tileHeight * tileStride;
    modulus(-yRot, tileHeight, tileY);
    t = tile + tileY * tileStride;
    modulus(-xRot, FB_UNIT, tileX);
    rot = tileX;

    while (height--) {

        /*
         * Pick up bits for this scanline
         */
        bits = READ(t);
        t += tileStride;
        if (t >= tileEnd)
            t = tile;
        bits = FbRotLeft(bits, rot);
        and = fbAnd(alu, bits, pm);
        xor = fbXor(alu, bits, pm);

        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
fbOddTile(FbBits * dst,
          FbStride dstStride,
          int dstX,
          int width,
          int height,
          FbBits * tile,
          FbStride tileStride,
          int tileWidth,
          int tileHeight, int alu, FbBits pm, int bpp, int xRot, int yRot)
{
    int tileX, tileY;
    int widthTmp;
    int h, w;
    int x, y;

    modulus(-yRot, tileHeight, tileY);
    y = 0;
    while (height) {
        h = tileHeight - tileY;
        if (h > height)
            h = height;
        height -= h;
        widthTmp = width;
        x = dstX;
        modulus(dstX - xRot, tileWidth, tileX);
        while (widthTmp) {
            w = tileWidth - tileX;
            if (w > widthTmp)
                w = widthTmp;
            widthTmp -= w;
            fbBlt(tile + tileY * tileStride,
                  tileStride,
                  tileX,
                  dst + y * dstStride,
                  dstStride, x, w, h, alu, pm, bpp, FALSE, FALSE);
            x += w;
            tileX = 0;
        }
        y += h;
        tileY = 0;
    }
}

void
fbTile(FbBits * dst,
       FbStride dstStride,
       int dstX,
       int width,
       int height,
       FbBits * tile,
       FbStride tileStride,
       int tileWidth,
       int tileHeight, int alu, FbBits pm, int bpp, int xRot, int yRot)
{
    if (FbEvenTile(tileWidth))
        fbEvenTile(dst, dstStride, dstX, width, height,
                   tile, tileStride, tileHeight, alu, pm, xRot, yRot);
    else
        fbOddTile(dst, dstStride, dstX, width, height,
                  tile, tileStride, tileWidth, tileHeight,
                  alu, pm, bpp, xRot, yRot);
}