TinyX/fb/fbpoint.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.
 */

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

#include "fb.h"

typedef void (*FbDots) (FbBits * dst,
                        FbStride dstStride,
                        int dstBpp,
                        BoxPtr pBox,
                        xPoint * pts,
                        int npt,
                        int xorg,
                        int yorg, int xoff, int yoff, FbBits and, FbBits xor);

void
fbDots(FbBits * dstOrig,
       FbStride dstStride,
       int dstBpp,
       BoxPtr pBox,
       xPoint * pts,
       int npt,
       int xorg, int yorg, int xoff, int yoff, FbBits andOrig, FbBits xorOrig)
{
    FbStip *dst = (FbStip *) dstOrig;

    int x1, y1, x2, y2;

    int x, y;

    FbStip *d;

    FbStip and = andOrig;

    FbStip xor = xorOrig;

    dstStride = FbBitsStrideToStipStride(dstStride);
    x1 = pBox->x1;
    y1 = pBox->y1;
    x2 = pBox->x2;
    y2 = pBox->y2;
    while (npt--) {
        x = pts->x + xorg;
        y = pts->y + yorg;
        pts++;
        if (x1 <= x && x < x2 && y1 <= y && y < y2) {
            x = (x + xoff) * dstBpp;
            d = dst + ((y + yoff) * dstStride) + (x >> FB_STIP_SHIFT);
            x &= FB_STIP_MASK;
            if (dstBpp == 24) {
                FbStip leftMask, rightMask;

                int n, rot;

                FbStip andT, xorT;

                rot = FbFirst24Rot(x);
                andT = FbRot24Stip(and, rot);
                xorT = FbRot24Stip(xor, rot);
                FbMaskStip(x, 24, leftMask, n, rightMask);
                if (leftMask) {
                    *d = FbDoMaskRRop(*d, andT, xorT, leftMask);
                    andT = FbNext24Stip(andT);
                    xorT = FbNext24Stip(xorT);
                    d++;
                }
                if (rightMask)
                    *d = FbDoMaskRRop(*d, andT, xorT, rightMask);
            }
            else
            {
                FbStip mask;

                mask = FbStipMask(x, dstBpp);
                *d = FbDoMaskRRop(*d, and, xor, mask);
            }
        }
    }
}

void
fbPolyPoint(DrawablePtr pDrawable,
            GCPtr pGC, int mode, int nptInit, xPoint * pptInit)
{
    FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);

    RegionPtr pClip = fbGetCompositeClip(pGC);

    FbBits *dst;

    FbStride dstStride;

    int dstBpp;

    int dstXoff, dstYoff;

    FbDots dots;

    FbBits and, xor;

    xPoint *ppt;

    int npt;

    BoxPtr pBox;

    int nBox;

    /* make pointlist origin relative */
    ppt = pptInit;
    npt = nptInit;
    if (mode == CoordModePrevious) {
        npt--;
        while (npt--) {
            ppt++;
            ppt->x += (ppt - 1)->x;
            ppt->y += (ppt - 1)->y;
        }
    }
    fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
    and = pPriv->and;
    xor = pPriv->xor;
    dots = fbDots;
    switch (dstBpp) {
    case 8:
        dots = fbDots8;
        break;
    case 16:
        dots = fbDots16;
        break;
    case 24:
        dots = fbDots24;
        break;
    case 32:
        dots = fbDots32;
        break;
    }
    for (nBox = REGION_NUM_RECTS(pClip), pBox = REGION_RECTS(pClip);
         nBox--; pBox++)
        (*dots) (dst, dstStride, dstBpp, pBox, pptInit, nptInit,
                 pDrawable->x, pDrawable->y, dstXoff, dstYoff, and, xor);
}