735 lines
14 KiB
C
735 lines
14 KiB
C
/*
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* Copyright © 1998 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <stdlib.h>
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#include "fb.h"
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#include "miline.h"
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#define fbBresShiftMask(mask,dir,bpp) ((bpp == FB_STIP_UNIT) ? 0 : \
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((dir < 0) ? FbStipLeft(mask,bpp) : \
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FbStipRight(mask,bpp)))
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void
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fbBresSolid (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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FbStip *dst;
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FbStride dstStride;
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int dstBpp;
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int dstXoff, dstYoff;
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FbGCPrivPtr pPriv = fbGetGCPrivate (pGC);
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FbStip and = (FbStip) pPriv->and;
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FbStip xor = (FbStip) pPriv->xor;
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FbStip mask, mask0;
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FbStip bits;
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fbGetStipDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
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dst += ((y1 + dstYoff) * dstStride);
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x1 = (x1 + dstXoff) * dstBpp;
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dst += x1 >> FB_STIP_SHIFT;
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x1 &= FB_STIP_MASK;
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mask0 = FbStipMask(0, dstBpp);
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mask = FbStipRight (mask0, x1);
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if (signdx < 0)
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mask0 = FbStipRight (mask0, FB_STIP_UNIT - dstBpp);
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if (signdy < 0)
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dstStride = -dstStride;
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if (axis == X_AXIS)
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{
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bits = 0;
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while (len--)
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{
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bits |= mask;
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mask = fbBresShiftMask(mask,signdx,dstBpp);
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if (!mask)
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{
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WRITE(dst, FbDoMaskRRop (READ(dst), and, xor, bits));
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bits = 0;
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dst += signdx;
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mask = mask0;
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}
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e += e1;
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if (e >= 0)
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{
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WRITE(dst, FbDoMaskRRop (READ(dst), and, xor, bits));
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bits = 0;
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dst += dstStride;
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e += e3;
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}
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}
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if (bits)
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WRITE(dst, FbDoMaskRRop (READ(dst), and, xor, bits));
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}
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else
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{
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while (len--)
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{
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WRITE(dst, FbDoMaskRRop (READ(dst), and, xor, mask));
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dst += dstStride;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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mask = fbBresShiftMask(mask,signdx,dstBpp);
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if (!mask)
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{
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dst += signdx;
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mask = mask0;
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}
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}
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}
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}
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fbFinishAccess (pDrawable);
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}
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void
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fbBresDash (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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FbStip *dst;
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FbStride dstStride;
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int dstBpp;
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int dstXoff, dstYoff;
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FbGCPrivPtr pPriv = fbGetGCPrivate (pGC);
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FbStip and = (FbStip) pPriv->and;
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FbStip xor = (FbStip) pPriv->xor;
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FbStip bgand = (FbStip) pPriv->bgand;
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FbStip bgxor = (FbStip) pPriv->bgxor;
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FbStip mask, mask0;
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FbDashDeclare;
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int dashlen;
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Bool even;
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Bool doOdd;
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fbGetStipDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
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doOdd = pGC->lineStyle == LineDoubleDash;
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FbDashInit (pGC, pPriv, dashOffset, dashlen, even);
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dst += ((y1 + dstYoff) * dstStride);
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x1 = (x1 + dstXoff) * dstBpp;
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dst += x1 >> FB_STIP_SHIFT;
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x1 &= FB_STIP_MASK;
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mask0 = FbStipMask(0, dstBpp);
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mask = FbStipRight (mask0, x1);
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if (signdx < 0)
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mask0 = FbStipRight (mask0, FB_STIP_UNIT - dstBpp);
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if (signdy < 0)
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dstStride = -dstStride;
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while (len--)
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{
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if (even)
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WRITE(dst, FbDoMaskRRop (READ(dst), and, xor, mask));
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else if (doOdd)
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WRITE(dst, FbDoMaskRRop (READ(dst), bgand, bgxor, mask));
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if (axis == X_AXIS)
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{
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mask = fbBresShiftMask(mask,signdx,dstBpp);
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if (!mask)
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{
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dst += signdx;
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mask = mask0;
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}
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e += e1;
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if (e >= 0)
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{
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dst += dstStride;
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e += e3;
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}
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}
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else
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{
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dst += dstStride;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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mask = fbBresShiftMask(mask,signdx,dstBpp);
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if (!mask)
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{
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dst += signdx;
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mask = mask0;
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}
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}
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}
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FbDashStep (dashlen, even);
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}
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fbFinishAccess (pDrawable);
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}
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void
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fbBresFill (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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while (len--)
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{
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fbFill (pDrawable, pGC, x1, y1, 1, 1);
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if (axis == X_AXIS)
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{
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x1 += signdx;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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y1 += signdy;
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}
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}
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else
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{
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y1 += signdy;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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x1 += signdx;
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}
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}
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}
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}
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static void
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fbSetFg (DrawablePtr pDrawable,
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GCPtr pGC,
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Pixel fg)
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{
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if (fg != pGC->fgPixel)
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{
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DoChangeGC (pGC, GCForeground, (XID *) &fg, FALSE);
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ValidateGC (pDrawable, pGC);
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}
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}
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void
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fbBresFillDash (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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FbGCPrivPtr pPriv = fbGetGCPrivate (pGC);
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FbDashDeclare;
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int dashlen;
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Bool even;
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Bool doOdd;
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Bool doBg;
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Pixel fg, bg;
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fg = pGC->fgPixel;
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bg = pGC->bgPixel;
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/* whether to fill the odd dashes */
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doOdd = pGC->lineStyle == LineDoubleDash;
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/* whether to switch fg to bg when filling odd dashes */
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doBg = doOdd && (pGC->fillStyle == FillSolid ||
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pGC->fillStyle == FillStippled);
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/* compute current dash position */
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FbDashInit (pGC, pPriv, dashOffset, dashlen, even);
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while (len--)
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{
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if (even || doOdd)
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{
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if (doBg)
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{
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if (even)
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fbSetFg (pDrawable, pGC, fg);
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else
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fbSetFg (pDrawable, pGC, bg);
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}
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fbFill (pDrawable, pGC, x1, y1, 1, 1);
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}
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if (axis == X_AXIS)
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{
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x1 += signdx;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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y1 += signdy;
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}
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}
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else
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{
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y1 += signdy;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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x1 += signdx;
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}
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}
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FbDashStep (dashlen, even);
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}
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if (doBg)
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fbSetFg (pDrawable, pGC, fg);
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}
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#ifdef FB_24BIT
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static void
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fbBresSolid24RRop (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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FbStip *dst;
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FbStride dstStride;
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int dstBpp;
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int dstXoff, dstYoff;
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FbGCPrivPtr pPriv = fbGetGCPrivate (pGC);
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FbStip and = pPriv->and;
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FbStip xor = pPriv->xor;
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FbStip leftMask, rightMask;
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int nl;
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FbStip *d;
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int x;
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int rot;
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FbStip andT, xorT;
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fbGetStipDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
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dst += ((y1 + dstYoff) * dstStride);
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x1 = (x1 + dstXoff) * 24;
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if (signdy < 0)
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dstStride = -dstStride;
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signdx *= 24;
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while (len--)
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{
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d = dst + (x1 >> FB_STIP_SHIFT);
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x = x1 & FB_STIP_MASK;
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rot = FbFirst24Rot (x);
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andT = FbRot24Stip(and,rot);
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xorT = FbRot24Stip(xor,rot);
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FbMaskStip (x, 24, leftMask, nl, rightMask);
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if (leftMask)
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{
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WRITE(d, FbDoMaskRRop (READ(d), andT, xorT, leftMask));
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d++;
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andT = FbNext24Stip (andT);
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xorT = FbNext24Stip (xorT);
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}
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if (rightMask)
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WRITE(d, FbDoMaskRRop (READ(d), andT, xorT, rightMask));
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if (axis == X_AXIS)
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{
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x1 += signdx;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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dst += dstStride;
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}
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}
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else
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{
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dst += dstStride;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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x1 += signdx;
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}
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}
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}
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fbFinishAccess (pDrawable);
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}
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static void
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fbBresDash24RRop (DrawablePtr pDrawable,
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GCPtr pGC,
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int dashOffset,
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int signdx,
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int signdy,
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int axis,
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int x1,
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int y1,
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int e,
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int e1,
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int e3,
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int len)
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{
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FbStip *dst;
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FbStride dstStride;
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int dstBpp;
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int dstXoff, dstYoff;
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FbGCPrivPtr pPriv = fbGetGCPrivate (pGC);
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FbStip andT, xorT;
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FbStip fgand = pPriv->and;
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FbStip fgxor = pPriv->xor;
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FbStip bgand = pPriv->bgand;
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FbStip bgxor = pPriv->bgxor;
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FbStip leftMask, rightMask;
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int nl;
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FbStip *d;
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int x;
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int rot;
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FbDashDeclare;
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int dashlen;
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Bool even;
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Bool doOdd;
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fbGetStipDrawable (pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
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doOdd = pGC->lineStyle == LineDoubleDash;
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/* compute current dash position */
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FbDashInit(pGC, pPriv, dashOffset, dashlen, even);
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dst += ((y1 + dstYoff) * dstStride);
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x1 = (x1 + dstXoff) * 24;
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if (signdy < 0)
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dstStride = -dstStride;
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signdx *= 24;
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while (len--)
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{
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if (even || doOdd)
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{
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if (even)
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{
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andT = fgand;
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xorT = fgxor;
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}
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else
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{
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andT = bgand;
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xorT = bgxor;
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}
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d = dst + (x1 >> FB_STIP_SHIFT);
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x = x1 & FB_STIP_MASK;
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rot = FbFirst24Rot (x);
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andT = FbRot24Stip (andT, rot);
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xorT = FbRot24Stip (xorT, rot);
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FbMaskStip (x, 24, leftMask, nl, rightMask);
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if (leftMask)
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{
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WRITE(d, FbDoMaskRRop (READ(d), andT, xorT, leftMask));
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d++;
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andT = FbNext24Stip (andT);
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xorT = FbNext24Stip (xorT);
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}
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if (rightMask)
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WRITE(d, FbDoMaskRRop (READ(d), andT, xorT, rightMask));
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}
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if (axis == X_AXIS)
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{
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x1 += signdx;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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dst += dstStride;
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}
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}
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else
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{
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dst += dstStride;
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e += e1;
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if (e >= 0)
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{
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e += e3;
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x1 += signdx;
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}
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}
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FbDashStep (dashlen, even);
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}
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fbFinishAccess (pDrawable);
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}
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#endif
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/*
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* For drivers that want to bail drawing some lines, this
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* function takes care of selecting the appropriate rasterizer
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* based on the contents of the specified GC.
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*/
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FbBres *
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fbSelectBres (DrawablePtr pDrawable,
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GCPtr pGC)
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{
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FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
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int dstBpp = pDrawable->bitsPerPixel;
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FbBres * bres;
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if (pGC->lineStyle == LineSolid)
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{
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bres = fbBresFill;
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if (pGC->fillStyle == FillSolid)
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{
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bres = fbBresSolid;
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#ifdef FB_24BIT
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if (dstBpp == 24)
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bres = fbBresSolid24RRop;
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#endif
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#ifndef FBNOPIXADDR
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if (pPriv->and == 0)
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{
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switch (dstBpp) {
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case 8: bres = fbBresSolid8; break;
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case 16: bres = fbBresSolid16; break;
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#ifdef FB_24BIT
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case 24: bres = fbBresSolid24; break;
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#endif
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case 32: bres = fbBresSolid32; break;
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}
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}
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#endif
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}
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}
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else
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{
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bres = fbBresFillDash;
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if (pGC->fillStyle == FillSolid)
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{
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bres = fbBresDash;
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#ifdef FB_24BIT
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if (dstBpp == 24)
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bres = fbBresDash24RRop;
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#endif
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#ifndef FBNOPIXADDR
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if (pPriv->and == 0 &&
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(pGC->lineStyle == LineOnOffDash || pPriv->bgand == 0))
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{
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switch (dstBpp) {
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case 8: bres = fbBresDash8; break;
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case 16: bres = fbBresDash16; break;
|
|
#ifdef FB_24BIT
|
|
case 24: bres = fbBresDash24; break;
|
|
#endif
|
|
case 32: bres = fbBresDash32; break;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
return bres;
|
|
}
|
|
|
|
void
|
|
fbBres (DrawablePtr pDrawable,
|
|
GCPtr pGC,
|
|
int dashOffset,
|
|
int signdx,
|
|
int signdy,
|
|
int axis,
|
|
int x1,
|
|
int y1,
|
|
int e,
|
|
int e1,
|
|
int e3,
|
|
int len)
|
|
{
|
|
(*fbSelectBres (pDrawable, pGC)) (pDrawable, pGC, dashOffset,
|
|
signdx, signdy, axis, x1, y1,
|
|
e, e1, e3, len);
|
|
}
|
|
|
|
void
|
|
fbSegment (DrawablePtr pDrawable,
|
|
GCPtr pGC,
|
|
int x1,
|
|
int y1,
|
|
int x2,
|
|
int y2,
|
|
Bool drawLast,
|
|
int *dashOffset)
|
|
{
|
|
FbBres * bres;
|
|
RegionPtr pClip = fbGetCompositeClip(pGC);
|
|
BoxPtr pBox;
|
|
int nBox;
|
|
int adx; /* abs values of dx and dy */
|
|
int ady;
|
|
int signdx; /* sign of dx and dy */
|
|
int signdy;
|
|
int e, e1, e2, e3; /* bresenham error and increments */
|
|
int len; /* length of segment */
|
|
int axis; /* major axis */
|
|
int octant;
|
|
int dashoff;
|
|
int doff;
|
|
unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
|
|
unsigned int oc1; /* outcode of point 1 */
|
|
unsigned int oc2; /* outcode of point 2 */
|
|
|
|
nBox = REGION_NUM_RECTS (pClip);
|
|
pBox = REGION_RECTS (pClip);
|
|
|
|
bres = fbSelectBres (pDrawable, pGC);
|
|
|
|
CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy,
|
|
1, 1, octant);
|
|
|
|
if (adx > ady)
|
|
{
|
|
axis = X_AXIS;
|
|
e1 = ady << 1;
|
|
e2 = e1 - (adx << 1);
|
|
e = e1 - adx;
|
|
len = adx;
|
|
}
|
|
else
|
|
{
|
|
axis = Y_AXIS;
|
|
e1 = adx << 1;
|
|
e2 = e1 - (ady << 1);
|
|
e = e1 - ady;
|
|
SetYMajorOctant(octant);
|
|
len = ady;
|
|
}
|
|
|
|
FIXUP_ERROR (e, octant, bias);
|
|
|
|
/*
|
|
* Adjust error terms to compare against zero
|
|
*/
|
|
e3 = e2 - e1;
|
|
e = e - e1;
|
|
|
|
/* we have bresenham parameters and two points.
|
|
all we have to do now is clip and draw.
|
|
*/
|
|
|
|
if (drawLast)
|
|
len++;
|
|
dashoff = *dashOffset;
|
|
*dashOffset = dashoff + len;
|
|
while(nBox--)
|
|
{
|
|
oc1 = 0;
|
|
oc2 = 0;
|
|
OUTCODES(oc1, x1, y1, pBox);
|
|
OUTCODES(oc2, x2, y2, pBox);
|
|
if ((oc1 | oc2) == 0)
|
|
{
|
|
(*bres) (pDrawable, pGC, dashoff,
|
|
signdx, signdy, axis, x1, y1,
|
|
e, e1, e3, len);
|
|
break;
|
|
}
|
|
else if (oc1 & oc2)
|
|
{
|
|
pBox++;
|
|
}
|
|
else
|
|
{
|
|
int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2;
|
|
int clip1 = 0, clip2 = 0;
|
|
int clipdx, clipdy;
|
|
int err;
|
|
|
|
if (miZeroClipLine(pBox->x1, pBox->y1, pBox->x2-1,
|
|
pBox->y2-1,
|
|
&new_x1, &new_y1, &new_x2, &new_y2,
|
|
adx, ady, &clip1, &clip2,
|
|
octant, bias, oc1, oc2) == -1)
|
|
{
|
|
pBox++;
|
|
continue;
|
|
}
|
|
|
|
if (axis == X_AXIS)
|
|
len = abs(new_x2 - new_x1);
|
|
else
|
|
len = abs(new_y2 - new_y1);
|
|
if (clip2 != 0 || drawLast)
|
|
len++;
|
|
if (len)
|
|
{
|
|
/* unwind bresenham error term to first point */
|
|
doff = dashoff;
|
|
err = e;
|
|
if (clip1)
|
|
{
|
|
clipdx = abs(new_x1 - x1);
|
|
clipdy = abs(new_y1 - y1);
|
|
if (axis == X_AXIS)
|
|
{
|
|
doff += clipdx;
|
|
err += e3 * clipdy + e1 * clipdx;
|
|
}
|
|
else
|
|
{
|
|
doff += clipdy;
|
|
err += e3 * clipdx + e1 * clipdy;
|
|
}
|
|
}
|
|
(*bres) (pDrawable, pGC, doff,
|
|
signdx, signdy, axis, new_x1, new_y1,
|
|
err, e1, e3, len);
|
|
}
|
|
pBox++;
|
|
}
|
|
} /* while (nBox--) */
|
|
}
|