678 lines
16 KiB
C
678 lines
16 KiB
C
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/*
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*
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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, int x1, int y1, int e, int e1, int e3, 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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bits = 0;
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while (len--) {
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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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*dst = FbDoMaskRRop(*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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*dst = FbDoMaskRRop(*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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*dst = FbDoMaskRRop(*dst, and, xor, bits);
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}
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else {
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while (len--) {
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*dst = FbDoMaskRRop(*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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e += e3;
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mask = fbBresShiftMask(mask, signdx, dstBpp);
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if (!mask) {
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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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}
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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, int axis, int x1, int y1, int e, int e1, int e3, 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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if (even)
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*dst = FbDoMaskRRop(*dst, and, xor, mask);
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else if (doOdd)
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*dst = FbDoMaskRRop(*dst, bgand, bgxor, mask);
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if (axis == X_AXIS) {
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mask = fbBresShiftMask(mask, signdx, dstBpp);
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if (!mask) {
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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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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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dst += dstStride;
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e += e1;
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if (e >= 0) {
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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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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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}
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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, int axis, int x1, int y1, int e, int e1, int e3, int len)
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{
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while (len--) {
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fbFill(pDrawable, pGC, x1, y1, 1, 1);
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if (axis == X_AXIS) {
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x1 += signdx;
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e += e1;
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if (e >= 0) {
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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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y1 += signdy;
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e += e1;
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if (e >= 0) {
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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, GCPtr pGC, Pixel fg)
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{
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if (fg != pGC->fgPixel) {
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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, int x1, int y1, int e, int e1, int e3, 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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if (even || doOdd) {
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if (doBg) {
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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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x1 += signdx;
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e += e1;
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if (e >= 0) {
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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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y1 += signdy;
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e += e1;
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if (e >= 0) {
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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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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, int x1, int y1, int e, int e1, int e3, 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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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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*d = FbDoMaskRRop(*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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*d = FbDoMaskRRop(*d, andT, xorT, rightMask);
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if (axis == X_AXIS) {
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x1 += signdx;
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e += e1;
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if (e >= 0) {
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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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dst += dstStride;
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e += e1;
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if (e >= 0) {
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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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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, int x1, int y1, int e, int e1, int e3, 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;
|
||
|
|
|
||
|
|
FbStip leftMask, rightMask;
|
||
|
|
|
||
|
|
int nl;
|
||
|
|
|
||
|
|
FbStip *d;
|
||
|
|
|
||
|
|
int x;
|
||
|
|
|
||
|
|
int rot;
|
||
|
|
|
||
|
|
FbDashDeclare;
|
||
|
|
int dashlen;
|
||
|
|
|
||
|
|
Bool even;
|
||
|
|
|
||
|
|
Bool doOdd;
|
||
|
|
|
||
|
|
fbGetStipDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
|
||
|
|
doOdd = pGC->lineStyle == LineDoubleDash;
|
||
|
|
|
||
|
|
/* compute current dash position */
|
||
|
|
FbDashInit(pGC, pPriv, dashOffset, dashlen, even);
|
||
|
|
|
||
|
|
dst += ((y1 + dstYoff) * dstStride);
|
||
|
|
x1 = (x1 + dstXoff) * 24;
|
||
|
|
if (signdy < 0)
|
||
|
|
dstStride = -dstStride;
|
||
|
|
signdx *= 24;
|
||
|
|
while (len--) {
|
||
|
|
if (even || doOdd) {
|
||
|
|
if (even) {
|
||
|
|
andT = fgand;
|
||
|
|
xorT = fgxor;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
andT = bgand;
|
||
|
|
xorT = bgxor;
|
||
|
|
}
|
||
|
|
d = dst + (x1 >> FB_STIP_SHIFT);
|
||
|
|
x = x1 & FB_STIP_MASK;
|
||
|
|
rot = FbFirst24Rot(x);
|
||
|
|
andT = FbRot24Stip(andT, rot);
|
||
|
|
xorT = FbRot24Stip(xorT, rot);
|
||
|
|
FbMaskStip(x, 24, leftMask, nl, rightMask);
|
||
|
|
if (leftMask) {
|
||
|
|
*d = FbDoMaskRRop(*d, andT, xorT, leftMask);
|
||
|
|
d++;
|
||
|
|
andT = FbNext24Stip(andT);
|
||
|
|
xorT = FbNext24Stip(xorT);
|
||
|
|
}
|
||
|
|
if (rightMask)
|
||
|
|
*d = FbDoMaskRRop(*d, andT, xorT, rightMask);
|
||
|
|
}
|
||
|
|
if (axis == X_AXIS) {
|
||
|
|
x1 += signdx;
|
||
|
|
e += e1;
|
||
|
|
if (e >= 0) {
|
||
|
|
e += e3;
|
||
|
|
dst += dstStride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
dst += dstStride;
|
||
|
|
e += e1;
|
||
|
|
if (e >= 0) {
|
||
|
|
e += e3;
|
||
|
|
x1 += signdx;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
FbDashStep(dashlen, even);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For drivers that want to bail drawing some lines, this
|
||
|
|
* function takes care of selecting the appropriate rasterizer
|
||
|
|
* based on the contents of the specified GC.
|
||
|
|
*/
|
||
|
|
|
||
|
|
FbBres *
|
||
|
|
fbSelectBres(DrawablePtr pDrawable, GCPtr pGC)
|
||
|
|
{
|
||
|
|
FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
|
||
|
|
|
||
|
|
int dstBpp = pDrawable->bitsPerPixel;
|
||
|
|
|
||
|
|
FbBres *bres;
|
||
|
|
|
||
|
|
if (pGC->lineStyle == LineSolid) {
|
||
|
|
bres = fbBresFill;
|
||
|
|
if (pGC->fillStyle == FillSolid) {
|
||
|
|
bres = fbBresSolid;
|
||
|
|
if (dstBpp == 24)
|
||
|
|
bres = fbBresSolid24RRop;
|
||
|
|
if (pPriv->and == 0) {
|
||
|
|
switch (dstBpp) {
|
||
|
|
case 8:
|
||
|
|
bres = fbBresSolid8;
|
||
|
|
break;
|
||
|
|
case 16:
|
||
|
|
bres = fbBresSolid16;
|
||
|
|
break;
|
||
|
|
case 24:
|
||
|
|
bres = fbBresSolid24;
|
||
|
|
break;
|
||
|
|
case 32:
|
||
|
|
bres = fbBresSolid32;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
bres = fbBresFillDash;
|
||
|
|
if (pGC->fillStyle == FillSolid) {
|
||
|
|
bres = fbBresDash;
|
||
|
|
if (dstBpp == 24)
|
||
|
|
bres = fbBresDash24RRop;
|
||
|
|
if (pPriv->and == 0 &&
|
||
|
|
(pGC->lineStyle == LineOnOffDash || pPriv->bgand == 0)) {
|
||
|
|
switch (dstBpp) {
|
||
|
|
case 8:
|
||
|
|
bres = fbBresDash8;
|
||
|
|
break;
|
||
|
|
case 16:
|
||
|
|
bres = fbBresDash16;
|
||
|
|
break;
|
||
|
|
case 24:
|
||
|
|
bres = fbBresDash24;
|
||
|
|
break;
|
||
|
|
case 32:
|
||
|
|
bres = fbBresDash32;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return bres;
|
||
|
|
}
|
||
|
|
|
||
|
|
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--) */
|
||
|
|
}
|