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-rw-r--r--cfb/cfb8line.c915
1 files changed, 915 insertions, 0 deletions
diff --git a/cfb/cfb8line.c b/cfb/cfb8line.c
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+++ b/cfb/cfb8line.c
@@ -0,0 +1,915 @@
+/*
+ * $Xorg: cfb8line.c,v 1.4 2001/02/09 02:04:37 xorgcvs Exp $
+ *
+Copyright 1990, 1998 The Open Group
+
+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.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+ *
+ * Author: Keith Packard, MIT X Consortium
+ */
+
+#include "X.h"
+
+#include "gcstruct.h"
+#include "windowstr.h"
+#include "pixmapstr.h"
+#include "regionstr.h"
+#include "scrnintstr.h"
+#include "mistruct.h"
+
+#include "cfb.h"
+#include "cfbmskbits.h"
+#include "cfbrrop.h"
+#include "miline.h"
+
+#ifdef PIXEL_ADDR
+
+#if defined(__GNUC__) && defined(mc68020)
+#define STUPID volatile
+#define REARRANGE
+#else
+#define STUPID
+#endif
+
+#ifdef __GNUC__
+/* lame compiler doesn't even look at 'register' attributes */
+#define I_H do{
+#define I_T }while(0);
+#define IMPORTANT_START I_H I_H I_H I_H I_H I_H I_H I_H I_H I_H
+#define IMPORTANT_END I_T I_T I_T I_T I_T I_T I_T I_T I_T I_T
+#else
+#define IMPORTANT_START
+#define IMPORTANT_END
+#endif
+
+#define isClipped(c,ul,lr) ((((c) - (ul)) | ((lr) - (c))) & ClipMask)
+
+#ifdef POLYSEGMENT
+
+# ifdef sun
+# define WIDTH_FAST 1152
+# endif
+
+# ifdef ultrix
+# define WIDTH_FAST 1024
+# endif
+
+# ifdef Mips
+# define WIDTH_FAST 4096
+# endif
+# ifdef WIDTH_FAST
+# if WIDTH_FAST == 1024
+# define FAST_MUL(y) ((y) << 10)
+# endif
+
+# if WIDTH_FAST == 1152
+# define FAST_MUL(y) (((y) << 10) + ((y) << 7))
+# endif
+
+# if WIDTH_FAST == 1280
+# define FAST_MUL(y) (((y) << 10) + ((y) << 8))
+# endif
+
+# if WIDTH_FAST == 2048
+# define FAST_MUL(y) ((y) << 11)
+# endif
+
+# if WIDTH_FAST == 4096
+# define FAST_MUL(y) ((y) << 12)
+# endif
+# endif
+
+# if defined(WIDTH_SHIFT)
+# ifdef FAST_MUL
+# define FUNC_NAME(e) RROP_NAME(RROP_NAME_CAT(e,Shift))
+# if RROP == GXcopy
+# define INCLUDE_OTHERS
+# define SERIOUS_UNROLLING
+# endif
+# define INCLUDE_DRAW
+# define NWIDTH(nwidth) WIDTH_FAST
+# define WIDTH_MUL(y,w) FAST_MUL(y)
+# endif
+# else
+# define FUNC_NAME(e) RROP_NAME(e)
+# define WIDTH_MUL(y,w) ((y) * (w))
+# define NWIDTH(nwidth) (nwidth)
+# define INCLUDE_DRAW
+# if !defined (FAST_MUL) && RROP == GXcopy
+# define INCLUDE_OTHERS
+# define SERIOUS_UNROLLING
+# endif
+# endif
+#else
+
+# define INCLUDE_DRAW
+# define WIDTH_MUL(y,w) ((y) * (w))
+# define NWIDTH(nwidth) nwidth
+# ifdef PREVIOUS
+# define FUNC_NAME(e) RROP_NAME(RROP_NAME_CAT(e,Previous))
+# else
+# define FUNC_NAME(e) RROP_NAME(e)
+# if RROP == GXcopy
+# define INCLUDE_OTHERS
+# ifdef PLENTIFUL_REGISTERS
+# define SAVE_X2Y2
+# endif
+# define ORIGIN
+# define SERIOUS_UNROLLING
+# else
+# define EITHER_MODE
+# endif
+# endif
+#endif
+
+#ifdef INCLUDE_DRAW
+
+int
+#ifdef POLYSEGMENT
+FUNC_NAME(cfb8SegmentSS1Rect) (pDrawable, pGC, nseg, pSegInit)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int nseg;
+ xSegment *pSegInit;
+#else
+FUNC_NAME(cfb8LineSS1Rect) (pDrawable, pGC, mode, npt, pptInit, pptInitOrig,
+ x1p,y1p,x2p,y2p)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int mode; /* Origin or Previous */
+ int npt; /* number of points */
+ DDXPointPtr pptInit, pptInitOrig;
+ int *x1p, *y1p, *x2p, *y2p;
+#endif /* POLYSEGEMENT */
+{
+ register long e;
+ register int y1_or_e1;
+ register PixelType *addrp;
+ register int stepmajor;
+ register int stepminor;
+#ifndef REARRANGE
+ register long e3;
+#endif
+#ifdef mc68000
+ register short x1_or_len;
+#else
+ register int x1_or_len;
+#endif
+ RROP_DECLARE
+
+#ifdef SAVE_X2Y2
+# define c2 y2
+#else
+ register int c2;
+#endif
+#ifndef ORIGIN
+ register int _x1, _y1, _x2, _y2; /* only used for CoordModePrevious */
+ int extents_x1, extents_y1, extents_x2, extents_y2;
+#endif /* !ORIGIN */
+#ifndef PREVIOUS
+ register int upperleft, lowerright;
+ CARD32 ClipMask = 0x80008000;
+#endif /* !PREVIOUS */
+#ifdef POLYSEGMENT
+ register int capStyle;
+#endif /* POLYSEGMENT */
+#ifdef SAVE_X2Y2
+ register int x2, y2;
+# define X1 x1_or_len
+# define Y1 y1_or_e1
+# define X2 x2
+# define Y2 y2
+#else
+# ifdef POLYSEGMENT
+# define X1 x1_or_len
+# define Y1 y1_or_e1
+# else
+# define X1 intToX(y1_or_e1)
+# define Y1 intToY(y1_or_e1)
+# endif /* POLYSEGMENT */
+# define X2 intToX(c2)
+# define Y2 intToY(c2)
+#endif /* SAVE_X2Y2 */
+ PixelType *addr;
+ int nwidth;
+ cfbPrivGCPtr devPriv;
+ BoxPtr extents;
+ int *ppt;
+ int octant;
+ unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
+
+ devPriv = cfbGetGCPrivate(pGC);
+ cfbGetPixelWidthAndPointer (pDrawable, nwidth, addr);
+#ifndef REARRANGE
+ RROP_FETCH_GCPRIV(devPriv);
+#endif
+ extents = &devPriv->pCompositeClip->extents;
+#ifndef PREVIOUS
+ c2 = *((int *) &pDrawable->x);
+ c2 -= (c2 & 0x8000) << 1;
+ upperleft = *((int *) &extents->x1) - c2;
+ lowerright = *((int *) &extents->x2) - c2 - 0x00010001;
+#endif /* !PREVIOUS */
+ addr = addr + WIDTH_MUL(pDrawable->y,nwidth) + pDrawable->x;
+#ifdef POLYSEGMENT
+ capStyle = pGC->capStyle - CapNotLast;
+ ppt = (int *) pSegInit;
+ while (nseg--)
+#else /* POLYSEGMENT */
+#ifdef EITHER_MODE
+ mode -= CoordModePrevious;
+ if (!mode)
+#endif /* EITHER_MODE */
+#ifndef ORIGIN
+ { /* CoordModePrevious */
+ ppt = (int *)pptInit + 1;
+ _x1 = *x1p;
+ _y1 = *y1p;
+ extents_x1 = extents->x1 - pDrawable->x;
+ extents_x2 = extents->x2 - pDrawable->x;
+ extents_y1 = extents->y1 - pDrawable->y;
+ extents_y2 = extents->y2 - pDrawable->y;
+ if (_x1 < extents_x1 || _x1 >= extents_x2 ||
+ _y1 < extents_y1 || _y1 >= extents_y2)
+ {
+ c2 = *ppt++;
+ intToCoord(c2, _x2, _y2);
+ *x2p = _x1 + _x2;
+ *y2p = _y1 + _y2;
+ return 1;
+ }
+ addrp = addr + WIDTH_MUL(_y1, nwidth) + _x1;
+ _x2 = _x1;
+ _y2 = _y1;
+ }
+#endif /* !ORIGIN */
+#ifdef EITHER_MODE
+ else
+#endif /* EITHER_MODE */
+#ifndef PREVIOUS
+ {
+ ppt = (int *) pptInit;
+ c2 = *ppt++;
+ if (isClipped (c2, upperleft, lowerright))
+ {
+ return 1;
+ }
+#ifdef SAVE_X2Y2
+ intToCoord(c2,x2,y2);
+#endif
+ addrp = addr + WIDTH_MUL(Y2, nwidth) + X2;
+ }
+#endif /* !PREVIOUS */
+ while (--npt)
+#endif /* POLYSEGMENT */
+ {
+#ifdef POLYSEGMENT
+ y1_or_e1 = ppt[0];
+ c2 = ppt[1];
+ ppt += 2;
+ if (isClipped(y1_or_e1,upperleft,lowerright)|isClipped(c2,upperleft,lowerright))
+ break;
+ intToCoord(y1_or_e1,x1_or_len,y1_or_e1);
+ /* compute now to avoid needing x1, y1 later */
+ addrp = addr + WIDTH_MUL(y1_or_e1, nwidth) + x1_or_len;
+#else /* !POLYSEGMENT */
+#ifdef EITHER_MODE
+ if (!mode)
+#endif /* EITHER_MODE */
+#ifndef ORIGIN
+ {
+ /* CoordModePrevious */
+ _x1 = _x2;
+ _y1 = _y2;
+ c2 = *ppt++;
+ intToCoord(c2, _x2, _y2);
+ _x2 = _x1 + _x2;
+ _y2 = _y1 + _y2;
+
+ if (_x2 < extents_x1 || _x2 >= extents_x2 ||
+ _y2 < extents_y1 || _y2 >= extents_y2)
+ {
+ break;
+ }
+ CalcLineDeltas(_x1, _y1, _x2, _y2, x1_or_len, y1_or_e1,
+ stepmajor, stepminor, 1, NWIDTH(nwidth), octant);
+ }
+#endif /* !ORIGIN */
+#ifdef EITHER_MODE
+ else
+#endif /* EITHER_MODE */
+#ifndef PREVIOUS
+ {
+#ifndef SAVE_X2Y2
+ y1_or_e1 = c2;
+#else
+ y1_or_e1 = y2;
+ x1_or_len = x2;
+#endif /* SAVE_X2Y2 */
+ c2 = *ppt++;
+
+ if (isClipped (c2, upperleft, lowerright))
+ break;
+#ifdef SAVE_X2Y2
+ intToCoord(c2,x2,y2);
+#endif
+ CalcLineDeltas(X1, Y1, X2, Y2, x1_or_len, y1_or_e1,
+ stepmajor, stepminor, 1, NWIDTH(nwidth), octant);
+ }
+#endif /* !PREVIOUS */
+#endif /* POLYSEGMENT */
+
+#ifdef POLYSEGMENT
+ CalcLineDeltas(X1, Y1, X2, Y2, x1_or_len, y1_or_e1,
+ stepmajor, stepminor, 1, NWIDTH(nwidth), octant);
+ /*
+ * although the horizontal code works for polyline, it
+ * slows down 10 pixel lines by 15%. Thus, this
+ * code is optimized for horizontal segments and
+ * random orientation lines, which seems like a reasonable
+ * assumption
+ */
+ if (y1_or_e1 != 0)
+ {
+#endif /* POLYSEGMENT */
+ if (x1_or_len < y1_or_e1)
+ {
+#ifdef REARRANGE
+ register int e3;
+#endif
+
+ e3 = x1_or_len;
+ x1_or_len = y1_or_e1;
+ y1_or_e1 = e3;
+
+ e3 = stepminor;
+ stepminor = stepmajor;
+ stepmajor = e3;
+ SetYMajorOctant(octant);
+ }
+
+ e = -x1_or_len;
+#ifdef POLYSEGMENT
+ if (!capStyle)
+ x1_or_len--;
+#endif
+
+ {
+#ifdef REARRANGE
+ register int e3;
+ RROP_DECLARE
+ RROP_FETCH_GCPRIV(devPriv);
+#endif
+
+ y1_or_e1 = y1_or_e1 << 1;
+ e3 = e << 1;
+
+ FIXUP_ERROR(e, octant, bias);
+
+#define body {\
+ RROP_SOLID(addrp); \
+ addrp += stepmajor; \
+ e += y1_or_e1; \
+ if (e >= 0) \
+ { \
+ addrp += stepminor; \
+ e += e3; \
+ } \
+ }
+
+#ifdef LARGE_INSTRUCTION_CACHE
+
+# ifdef SERIOUS_UNROLLING
+# define UNROLL 16
+# else
+# define UNROLL 4
+# endif
+#define CASE(n) case -n: body
+
+ while ((x1_or_len -= UNROLL) >= 0)
+ {
+ body body body body
+# if UNROLL >= 8
+ body body body body
+# endif
+# if UNROLL >= 12
+ body body body body
+# endif
+# if UNROLL >= 16
+ body body body body
+# endif
+ }
+ switch (x1_or_len)
+ {
+ CASE(1) CASE(2) CASE(3)
+# if UNROLL >= 8
+ CASE(4) CASE(5) CASE(6) CASE(7)
+# endif
+# if UNROLL >= 12
+ CASE(8) CASE(9) CASE(10) CASE(11)
+# endif
+# if UNROLL >= 16
+ CASE(12) CASE(13) CASE(14) CASE(15)
+# endif
+ }
+#else /* !LARGE_INSTRUCTION_CACHE */
+
+ IMPORTANT_START
+ IMPORTANT_START
+
+ if (x1_or_len & 1)
+ body
+ x1_or_len >>= 1;
+ while (x1_or_len--) {
+ body body
+ }
+
+ IMPORTANT_END
+ IMPORTANT_END
+#endif /* LARGE_INSTRUCTION_CACHE */
+
+#ifdef POLYSEGMENT
+ RROP_SOLID(addrp);
+#endif
+ }
+#undef body
+#ifdef POLYSEGMENT
+ }
+ else
+ {
+# ifdef REARRANGE
+ register int e3;
+ RROP_DECLARE
+ RROP_FETCH_GCPRIV(devPriv);
+# endif /* REARRANGE */
+ if (stepmajor < 0)
+ {
+ addrp -= x1_or_len;
+ if (capStyle)
+ x1_or_len++;
+ else
+ addrp++;
+ }
+ else
+ {
+ if (capStyle)
+ x1_or_len++;
+ }
+ y1_or_e1 = ((int) addrp) & PIM;
+ addrp = (PixelType *) (((unsigned char *) addrp) - y1_or_e1);
+#if PGSZ == 32
+# if PWSH != 2
+ y1_or_e1 >>= (2 - PWSH);
+# endif
+#else /* PGSZ == 64 */
+# if PWSH != 3
+ y1_or_e1 >>= (3 - PWSH);
+# endif
+#endif /* PGSZ */
+ if (y1_or_e1 + x1_or_len <= PPW)
+ {
+ if (x1_or_len)
+ {
+ maskpartialbits(y1_or_e1, x1_or_len, e)
+ RROP_SOLID_MASK((unsigned long *) addrp, e);
+ }
+ }
+ else
+ {
+ maskbits(y1_or_e1, x1_or_len, e, e3, x1_or_len)
+ if (e)
+ {
+ RROP_SOLID_MASK((unsigned long *) addrp, e);
+ addrp += PPW;
+ }
+ RROP_SPAN(addrp, x1_or_len)
+ if (e3)
+ RROP_SOLID_MASK((unsigned long *) addrp, e3);
+ }
+ }
+#endif /* POLYSEGMENT */
+ }
+#ifdef POLYSEGMENT
+ if (nseg >= 0)
+ return (xSegment *) ppt - pSegInit;
+#else
+ if (npt)
+ {
+#ifdef EITHER_MODE
+ if (!mode)
+#endif /* EITHER_MODE */
+#ifndef ORIGIN
+ {
+ *x1p = _x1;
+ *y1p = _y1;
+ *x2p = _x2;
+ *y2p = _y2;
+ }
+#endif /* !ORIGIN */
+ return ((DDXPointPtr) ppt - pptInit) - 1;
+ }
+#endif /* POLYSEGMENT */
+
+#ifndef POLYSEGMENT
+# ifndef ORIGIN
+# define C2 c2
+# else
+# define C2 ppt[-1]
+# endif
+#ifdef EITHER_MODE
+ if (pGC->capStyle != CapNotLast &&
+ ((mode ? (C2 != *((int *) pptInitOrig))
+ : ((_x2 != pptInitOrig->x) ||
+ (_y2 != pptInitOrig->y)))
+ || (ppt == ((int *)pptInitOrig) + 2)))
+#endif /* EITHER_MODE */
+#ifdef PREVIOUS
+ if (pGC->capStyle != CapNotLast &&
+ ((_x2 != pptInitOrig->x) ||
+ (_y2 != pptInitOrig->y) ||
+ (ppt == ((int *)pptInitOrig) + 2)))
+#endif /* PREVIOUS */
+#ifdef ORIGIN
+ if (pGC->capStyle != CapNotLast &&
+ ((C2 != *((int *) pptInitOrig)) ||
+ (ppt == ((int *)pptInitOrig) + 2)))
+#endif /* !PREVIOUS */
+ {
+# ifdef REARRANGE
+ RROP_DECLARE
+
+ RROP_FETCH_GCPRIV(devPriv);
+# endif
+ RROP_SOLID (addrp);
+ }
+#endif /* !POLYSEGMENT */
+ return -1;
+}
+
+#endif /* INCLUDE_DRAW */
+
+
+#ifdef INCLUDE_OTHERS
+
+#ifdef POLYSEGMENT
+
+void
+cfb8SegmentSS1Rect (pDrawable, pGC, nseg, pSegInit)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int nseg;
+ xSegment *pSegInit;
+{
+ int (*func)();
+ void (*clip)();
+ int drawn;
+ cfbPrivGCPtr devPriv;
+
+ devPriv = cfbGetGCPrivate(pGC);
+#ifdef NO_ONE_RECT
+ if (REGION_NUM_RECTS(devPriv->pCompositeClip) != 1)
+ {
+ cfbSegmentSS(pDrawable, pGC, nseg, pSegInit);
+ return;
+ }
+#endif
+ switch (devPriv->rop)
+ {
+ case GXcopy:
+ func = cfb8SegmentSS1RectCopy;
+ clip = cfb8ClippedLineCopy;
+#ifdef FAST_MUL
+ if (cfbGetPixelWidth (pDrawable) == WIDTH_FAST)
+ func = cfb8SegmentSS1RectShiftCopy;
+#endif
+ break;
+ case GXxor:
+ func = cfb8SegmentSS1RectXor;
+ clip = cfb8ClippedLineXor;
+ break;
+ default:
+ func = cfb8SegmentSS1RectGeneral;
+ clip = cfb8ClippedLineGeneral;
+ break;
+ }
+ while (nseg)
+ {
+ drawn = (*func) (pDrawable, pGC, nseg, pSegInit);
+ if (drawn == -1)
+ break;
+ (*clip) (pDrawable, pGC,
+ pSegInit[drawn-1].x1, pSegInit[drawn-1].y1,
+ pSegInit[drawn-1].x2, pSegInit[drawn-1].y2,
+ &devPriv->pCompositeClip->extents,
+ pGC->capStyle == CapNotLast);
+ pSegInit += drawn;
+ nseg -= drawn;
+ }
+}
+
+#else /* POLYSEGMENT */
+
+void
+cfb8LineSS1Rect (pDrawable, pGC, mode, npt, pptInit)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int mode;
+ int npt;
+ DDXPointPtr pptInit;
+{
+ int (*func)();
+ void (*clip)();
+ int drawn;
+ cfbPrivGCPtr devPriv;
+ int x1, y1, x2, y2;
+ DDXPointPtr pptInitOrig = pptInit;
+
+ devPriv = cfbGetGCPrivate(pGC);
+#ifdef NO_ONE_RECT
+ if (REGION_NUM_RECTS(devPriv->pCompositeClip) != 1)
+ {
+ cfbLineSS(pDrawable, pGC, mode, npt, pptInit);
+ return;
+ }
+#endif
+ switch (devPriv->rop)
+ {
+ case GXcopy:
+ func = cfb8LineSS1RectCopy;
+ clip = cfb8ClippedLineCopy;
+ if (mode == CoordModePrevious)
+ func = cfb8LineSS1RectPreviousCopy;
+ break;
+ case GXxor:
+ func = cfb8LineSS1RectXor;
+ clip = cfb8ClippedLineXor;
+ break;
+ default:
+ func = cfb8LineSS1RectGeneral;
+ clip = cfb8ClippedLineGeneral;
+ break;
+ }
+ if (mode == CoordModePrevious)
+ {
+ x1 = pptInit->x;
+ y1 = pptInit->y;
+ while (npt > 1)
+ {
+ drawn = (*func) (pDrawable, pGC, mode, npt, pptInit, pptInitOrig,
+ &x1, &y1, &x2, &y2);
+ if (drawn == -1)
+ break;
+ (*clip) (pDrawable, pGC, x1, y1, x2, y2,
+ &devPriv->pCompositeClip->extents,
+ drawn != npt - 1 || pGC->capStyle == CapNotLast);
+ pptInit += drawn;
+ npt -= drawn;
+ x1 = x2;
+ y1 = y2;
+ }
+ }
+ else
+ {
+ while (npt > 1)
+ {
+ drawn = (*func) (pDrawable, pGC, mode, npt, pptInit, pptInitOrig,
+ &x1, &y1, &x2, &y2);
+ if (drawn == -1)
+ break;
+ (*clip) (pDrawable, pGC,
+ pptInit[drawn-1].x, pptInit[drawn-1].y,
+ pptInit[drawn].x, pptInit[drawn].y,
+ &devPriv->pCompositeClip->extents,
+ drawn != npt - 1 || pGC->capStyle == CapNotLast);
+ pptInit += drawn;
+ npt -= drawn;
+ }
+ }
+}
+
+#endif /* else POLYSEGMENT */
+#endif /* INCLUDE_OTHERS */
+
+#if !defined(POLYSEGMENT) && !defined (PREVIOUS)
+
+void
+RROP_NAME (cfb8ClippedLine) (pDrawable, pGC, x1, y1, x2, y2, boxp, shorten)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int x1, y1, x2, y2;
+ BoxPtr boxp;
+ Bool shorten;
+{
+ int oc1, oc2;
+ int e, e1, e3, len;
+ int adx, ady;
+
+ PixelType *addr;
+ int nwidth;
+ int stepx, stepy;
+ int xorg, yorg;
+ int new_x1, new_y1, new_x2, new_y2;
+ Bool pt1_clipped, pt2_clipped;
+ int changex, changey, result;
+ int octant;
+ unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
+
+ cfbGetPixelWidthAndPointer(pDrawable, nwidth, addr);
+
+ xorg = pDrawable->x;
+ yorg = pDrawable->y;
+ x1 += xorg;
+ y1 += yorg;
+ x2 += xorg;
+ y2 += yorg;
+ oc1 = 0;
+ oc2 = 0;
+ OUTCODES (oc1, x1, y1, boxp);
+ OUTCODES (oc2, x2, y2, boxp);
+
+ if (oc1 & oc2)
+ return;
+
+ CalcLineDeltas(x1, y1, x2, y2, adx, ady, stepx, stepy, 1, nwidth, octant);
+
+ if (adx <= ady)
+ {
+ int t;
+
+ t = adx;
+ adx = ady;
+ ady = t;
+
+ t = stepx;
+ stepx = stepy;
+ stepy = t;
+
+ SetYMajorOctant(octant);
+ }
+ e = - adx;
+ e1 = ady << 1;
+ e3 = - (adx << 1);
+
+ FIXUP_ERROR(e, octant, bias);
+
+ new_x1 = x1;
+ new_y1 = y1;
+ new_x2 = x2;
+ new_y2 = y2;
+ pt1_clipped = 0;
+ pt2_clipped = 0;
+
+ if (IsXMajorOctant(octant))
+ {
+ result = miZeroClipLine(boxp->x1, boxp->y1, boxp->x2 - 1, boxp->y2 - 1,
+ &new_x1, &new_y1, &new_x2, &new_y2,
+ adx, ady,
+ &pt1_clipped, &pt2_clipped,
+ octant, bias, oc1, oc2);
+ if (result == -1)
+ return;
+
+ len = abs(new_x2 - new_x1) - 1; /* this routine needs the "-1" */
+
+ /* if we've clipped the endpoint, always draw the full length
+ * of the segment, because then the capstyle doesn't matter
+ * if x2,y2 isn't clipped, use the capstyle
+ * (shorten == TRUE <--> CapNotLast)
+ */
+ if (pt2_clipped || !shorten)
+ len++;
+
+ if (pt1_clipped)
+ {
+ /* must calculate new error terms */
+ changex = abs(new_x1 - x1);
+ changey = abs(new_y1 - y1);
+ e = e + changey * e3 + changex * e1;
+ }
+ }
+ else /* Y_AXIS */
+ {
+ result = miZeroClipLine(boxp->x1, boxp->y1, boxp->x2 - 1, boxp->y2 - 1,
+ &new_x1, &new_y1, &new_x2, &new_y2,
+ ady, adx,
+ &pt1_clipped, &pt2_clipped,
+ octant, bias, oc1, oc2);
+ if (result == -1)
+ return;
+
+ len = abs(new_y2 - new_y1) - 1; /* this routine needs the "-1" */
+
+ /* if we've clipped the endpoint, always draw the full length
+ * of the segment, because then the capstyle doesn't matter
+ * if x2,y2 isn't clipped, use the capstyle
+ * (shorten == TRUE <--> CapNotLast)
+ */
+ if (pt2_clipped || !shorten)
+ len++;
+
+ if (pt1_clipped)
+ {
+ /* must calculate new error terms */
+ changex = abs(new_x1 - x1);
+ changey = abs(new_y1 - y1);
+ e = e + changex * e3 + changey * e1;
+ }
+ }
+ x1 = new_x1;
+ y1 = new_y1;
+ {
+ register PixelType *addrp;
+ RROP_DECLARE
+
+ RROP_FETCH_GC(pGC);
+
+ addrp = addr + (y1 * nwidth) + x1;
+
+#ifndef REARRANGE
+ if (!ady)
+ {
+#define body { RROP_SOLID(addrp); addrp += stepx; }
+ while (len >= PGSZB)
+ {
+ body body body body
+#if PGSZ == 64
+ body body body body
+#endif
+ len -= PGSZB;
+ }
+ switch (len)
+ {
+#if PGSZ == 64
+ case 7: body case 6: body case 5: body case 4: body
+#endif
+ case 3: body case 2: body case 1: body
+ }
+#undef body
+ }
+ else
+#endif /* !REARRANGE */
+ {
+#define body {\
+ RROP_SOLID(addrp); \
+ addrp += stepx; \
+ e += e1; \
+ if (e >= 0) \
+ { \
+ addrp += stepy; \
+ e += e3; \
+ } \
+ }
+
+#ifdef LARGE_INSTRUCTION_CACHE
+ while ((len -= PGSZB) >= 0)
+ {
+ body body body body
+#if PGSZ == 64
+ body body body body
+#endif
+ }
+ switch (len)
+ {
+ case -1: body case -2: body case -3: body
+#if PGSZ == 64
+ case -4: body case -5: body case -6: body case -7: body
+#endif
+ }
+#else /* !LARGE_INSTRUCTION_CACHE */
+ IMPORTANT_START;
+
+ while ((len -= 2) >= 0)
+ {
+ body body;
+ }
+ if (len & 1)
+ body;
+
+ IMPORTANT_END;
+#endif /* LARGE_INSTRUCTION_CACHE */
+ }
+ RROP_SOLID(addrp);
+#undef body
+ }
+}
+
+#endif /* !POLYSEGMENT && !PREVIOUS */
+#endif /* PIXEL_ADDR */
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-22 12:09:32 +0000