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- /* $XConsortium: paths.c,v 1.4 91/10/10 11:18:40 rws Exp $ */
- /* Copyright International Business Machines, Corp. 1991
- * All Rights Reserved
- * Copyright Lexmark International, Inc. 1991
- * All Rights Reserved
- *
- * License to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted,
- * provided that the above copyright notice appear in all copies and that
- * both that copyright notice and this permission notice appear in
- * supporting documentation, and that the name of IBM or Lexmark not be
- * used in advertising or publicity pertaining to distribution of the
- * software without specific, written prior permission.
- *
- * IBM AND LEXMARK PROVIDE THIS SOFTWARE "AS IS", WITHOUT ANY WARRANTIES OF
- * ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO ANY
- * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
- * AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. THE ENTIRE RISK AS TO THE
- * QUALITY AND PERFORMANCE OF THE SOFTWARE, INCLUDING ANY DUTY TO SUPPORT
- * OR MAINTAIN, BELONGS TO THE LICENSEE. SHOULD ANY PORTION OF THE
- * SOFTWARE PROVE DEFECTIVE, THE LICENSEE (NOT IBM OR LEXMARK) ASSUMES THE
- * ENTIRE COST OF ALL SERVICING, REPAIR AND CORRECTION. IN NO EVENT SHALL
- * IBM OR LEXMARK BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
- * THIS SOFTWARE.
- */
-
- /*
- * PATHS Module - Path Operator Handler
- *
- * This is the module that is responsible for building and transforming
- * path lists.
- *
- * author: Jeffrey B. Lotspiech (lotspiech@almaden.ibm.com)
- */
-
-
- #ifndef T1GST
- #include "global.h"
- #endif
-
-
- /*
- * Local prototypes
- */
- static struct segment *ReverseSubPath(struct segment *p);
- static struct segment *DropSubPath(struct segment *p0);
- static struct segment *SplitPath(struct segment *anchor, struct segment *before);
- static void UnClose(struct segment *p0);
-
-
- /*
- * When 'link' is NULL, we are at the last segment in the path (surprise!).
- *
- * 'last' is only non-NULL on the first segment of a path,
- * for all the other segments 'last' == NULL. We test for a non-NULL
- * 'last' (ISPATHANCHOR predicate) when we are given an alleged path
- * to make sure the user is not trying to pull a fast one on us.
- *
- * A path may be a collection of disjoint paths. Every break in the
- * disjoint path is represented by a MOVETYPE segment.
- */
-
- /*
- * CopyPath() - Physically Duplicating a Path
- *
- * This simple function illustrates moving through the path linked list.
- * Duplicating a segment just involves making a copy of it, except for
- * text, which has some auxiliary things involved. We don't feel
- * competent to duplicate text in this module, so we call someone who
- * knows how (in the FONTS module).
- */
- struct segment *t1_CopyPath(struct segment *p0)
- {
- struct segment *p, *n, *last, *anchor;
-
- for (p = p0, anchor = NULL; p != NULL; p = p->link)
- {
- ARGCHECK((!ISPATHTYPE(p->type) || ((p != p0) && (p->last != NULL))),
- "CopyPath: invalid segment", p, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- if (p->type == TEXTTYPE)
- n = (struct segment *)CopyText(p);
- else
- n = (struct segment *)Allocate(p->size, p, 0);
- n->last = NULL;
- if (anchor == NULL)
- anchor = n;
- else
- last->link = n;
- last = n;
- }
- /*
- * At this point we have a chain of newly allocated segments hanging off
- * 'anchor'. We need to make sure the first segment points to the last:
- */
- if (anchor != NULL)
- {
- n->link = NULL;
- anchor->last = n;
- }
-
- return (anchor);
- }
-
-
- /*
- * KillPath() - Destroying a Path
- *
- * Destroying a path is simply a matter of freeing each segment in the
- * linked list. Again, we let the experts handle text.
- */
- void t1_KillPath(struct segment *p)
- {
- struct segment *linkp; /* temp register holding next segment*/
-
- /* return conditional based on reference count 3-26-91 PNM */
- if ((--(p->references) > 1) ||
- ((p->references == 1) && !ISPERMANENT(p->flag)))
- return;
-
- while (p != NULL)
- {
- if (!ISPATHTYPE(p->type))
- {
- ArgErr("KillPath: bad segment", p, NULL);
- return;
- }
- linkp = p->link;
- if (p->type == TEXTTYPE)
- KillText(p);
- else
- Free(p);
- p = linkp;
- }
- }
-
-
- /*
- * "location" Objects
- *
- * The TYPE1IMAGER user creates and destroys objects of type "location". These
- * objects locate points for the primitive path operators. We play a trick
- * here and store these objects in the same "segment" structure used for
- * paths, with a type field == MOVETYPE.
- *
- * This allows the Line() operator, for example, to be very trivial:
- * It merely stamps its input structure as a LINETYPE and returns it to the
- * caller--assuming, of course, the input structure was not permanent (as
- * it usually isn't).
- *
- * The "movesegment" Template Structure
- *
- * This template is used as a generic segment structure for Allocate:
- */
-
-
- /* added reference field 1 to temporary template below 3-26-91 PNM */
- static struct segment movetemplate =
- {MOVETYPE, 0, 1, sizeof(struct segment), 0,
- NULL, NULL, 0, 0};
-
-
- /*
- * Loc() - Create an "Invisible Line" Between (0,0) and a Point
- */
- struct segment *t1_Loc(
- struct XYspace *S, /* coordinate space to interpret X,Y */
- double x, double y) /* destination point */
- {
- struct segment *r;
-
- IfTrace3((MustTraceCalls), "..Loc(S=%z, x=%f, y=%f)\n", S, &x, &y);
-
- r = (struct segment *)Allocate(sizeof(struct segment), &movetemplate, 0);
- TYPECHECK("Loc", S, SPACETYPE, r, (0,NULL,NULL,NULL), struct segment *);
-
- r->last = r;
- r->context = S->context;
- (*S->convert) (&r->dest, S, x, y);
- ConsumeSpace(S);
- return (r);
- }
-
-
- /*
- * ILoc() - Loc() With Integer Arguments
- */
- struct segment *ILoc(
- struct XYspace *S, /* coordinate space to interpret X,Y */
- int x, int y) /* destination point */
- {
- struct segment *r;
-
- IfTrace3((MustTraceCalls), "..ILoc(S=%z, x=%d, y=%d)\n",
- S, (long)x, (long)y);
- r = (struct segment *)Allocate(sizeof(struct segment), &movetemplate, 0);
- TYPECHECK("Loc", S, SPACETYPE, r, (0,NULL,NULL,NULL), struct segment *);
-
- r->last = r;
- r->context = S->context;
- (*S->iconvert) (&r->dest, S, (long)x, (long)y);
- ConsumeSpace(S);
- return (r);
- }
-
-
- /*
- * SubLoc() - Vector Subtraction of Two Location Objects
- *
- * This user operator subtracts two location objects, yielding a new
- * location object that is the result.
- *
- * The symmetrical function AddLoc() is totally redundent with Join(),
- * so it is not provided.
- */
- struct segment *SubLoc(struct segment *p1, struct segment *p2)
- {
- IfTrace2((MustTraceCalls), "SubLoc(%z, %z)\n", p1, p2);
-
- ARGCHECK(!ISLOCATION(p1), "SubLoc: bad first arg", p1, NULL, (0,NULL,NULL,NULL), struct segment *);
- ARGCHECK(!ISLOCATION(p2), "SubLoc: bad second arg", p2, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- p1 = UniquePath(p1);
- p1->dest.x -= p2->dest.x;
- p1->dest.y -= p2->dest.y;
- ConsumePath(p2);
- return (p1);
- }
-
-
- /*
- * Straight Line Segments
- *
- * PathSegment() - Create a Generic Path Segment
- *
- * Many routines need a LINETYPE or MOVETYPE path segment, but do not
- * want to go through the external user's interface, because, for example,
- * they already know the "fractpel" destination of the segment and the
- * conversion is unnecessary. PathSegment() is an internal routine
- * provided to the rest of TYPE1IMAGER for handling these cases.
- */
- struct segment *t1_PathSegment(
- int type, /* LINETYPE or MOVETYPE */
- fractpel x, fractpel y) /* where to go to, if known */
- {
- struct segment *r; /* newly created segment */
-
- r = (struct segment *)Allocate(sizeof(struct segment), &movetemplate, 0);
-
- r->type = type;
- r->last = r; /* last points to itself for singleton */
- r->dest.x = x;
- r->dest.y = y;
- return (r);
- }
-
-
- /*
- * Line() - Create a Line Segment Between (0,0) and a Point P
- *
- * This involves just creating and filling out a segment structure:
- */
- struct segment *Line(
- struct segment *P) /* relevant coordinate space */
- {
-
- IfTrace1((MustTraceCalls), "..Line(%z)\n", P);
- ARGCHECK(!ISLOCATION(P), "Line: arg not a location", P, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- P = UniquePath(P);
- P->type = LINETYPE;
- return (P);
- }
-
-
- /*
- * Curved Path Segments
- *
- * We need more points to describe curves. So, the structures for curved
- * path segments are slightly different. The first part is identical;
- * the curved structures are larger with the extra points on the end.
- *
- * Bezier Segment Structure
- *
- * We support third order Bezier curves. They are specified with four
- * control points A, B, C, and D. The curve starts at A with slope AB
- * and ends at D with slope CD. The curvature at the point A is inversely
- * related to the length |AB|, and the curvature at the point D is
- * inversely related to the length |CD|. Point A is always point (0,0).
- */
-
-
- /*
- * Bezier() - Generate a Bezier Segment
- *
- * This is just a simple matter of filling out a 'beziersegment' structure:
- */
- struct beziersegment *Bezier(
- struct segment *B, /* second control point */
- struct segment *C, /* third control point */
- struct segment *D) /* fourth control point (ending point) */
- {
- /* added reference field of 1 to temporary template below 3-26-91 PNM */
- static struct beziersegment template =
- {BEZIERTYPE, 0, 1, sizeof(struct beziersegment), 0,
- NULL, NULL,
- {0, 0},
- {0, 0},
- {0, 0}};
-
- struct beziersegment *r; /* output segment */
-
- IfTrace3((MustTraceCalls), "..Bezier(%z, %z, %z)\n", B, C, D);
- ARGCHECK(!ISLOCATION(B), "Bezier: bad B", B, NULL, (2, C, D,NULL), struct beziersegment *);
- ARGCHECK(!ISLOCATION(C), "Bezier: bad C", C, NULL, (2, B, D,NULL), struct beziersegment *);
- ARGCHECK(!ISLOCATION(D), "Bezier: bad D", D, NULL, (2, B, C,NULL), struct beziersegment *);
-
- r = (struct beziersegment *)Allocate(sizeof(struct beziersegment), &template, 0);
-
- r->last = (struct segment *)r;
- r->dest.x = D->dest.x;
- r->dest.y = D->dest.y;
- r->B.x = B->dest.x;
- r->B.y = B->dest.y;
- r->C.x = C->dest.x;
- r->C.y = C->dest.y;
-
- ConsumePath(B);
- ConsumePath(C);
- ConsumePath(D);
- return (r);
- }
-
-
- /*
- * Font "Hint" Segments
- *
- * Hint() - A Font 'Hint' Segment
- *
- * This is temporary code while we experiment with hints.
- */
- struct hintsegment *Hint(struct XYspace *S, double ref, double width, char orientation,
- char hinttype, char adjusttype, char direction, int label)
- {
- /* added reference field of 1 to hintsegment template below 3-26-91 PNM */
- static struct hintsegment template =
- {HINTTYPE, 0, 1, sizeof(struct hintsegment), 0,
- NULL, NULL,
- {0, 0},
- {0, 0},
- {0, 0},
- ' ', ' ', ' ', ' ', 0};
-
- struct hintsegment *r;
-
- r = (struct hintsegment *)Allocate(sizeof(struct hintsegment), &template, 0);
-
- r->orientation = orientation;
- if (width == 0.0)
- width = 1.0;
-
- if (orientation == 'h')
- {
- (*S->convert) (&r->ref, S, 0.0, ref);
- (*S->convert) (&r->width, S, 0.0, width);
- }
- else if (orientation == 'v')
- {
- (*S->convert) (&r->ref, S, ref, 0.0);
- (*S->convert) (&r->width, S, width, 0.0);
- }
- else
- return ((struct hintsegment *)ArgErr("Hint: orient not 'h' or 'v'", NULL, NULL));
- if (r->width.x < 0)
- r->width.x = -r->width.x;
- if (r->width.y < 0)
- r->width.y = -r->width.y;
- r->hinttype = hinttype;
- r->adjusttype = adjusttype;
- r->direction = direction;
- r->label = label;
- r->last = (struct segment *)r;
- ConsumeSpace(S);
- return (r);
- }
-
-
- /*
- * POP removes the first segment in a path 'p' and Frees it. 'p' is left
- * pointing to the end of the path:
- */
- #define POP(p) \
- { register struct segment *linkp; \
- linkp = p->link; \
- if (linkp != NULL) \
- linkp->last = p->last; \
- Free(p); \
- p = linkp; }
-
-
- /*
- * INSERT inserts a single segment in the middle of a chain. 'b' is
- * the segment before, 'p' the segment to be inserted, and 'a' the
- * segment after.
- */
- #define INSERT(b,p,a) b->link=p; p->link=a; p->last=NULL
-
-
- /*
- * Join() - Join Two Objects Together
- *
- * If these are paths, this operator simply invokes the CONCAT macro.
- * Why so much code then, you ask? Well we have to check for object
- * types other than paths, and also check for certain path consistency
- * rules.
- */
- struct segment *t1_Join(struct segment *p1, struct segment *p2)
- {
- IfTrace2((MustTraceCalls && PathDebug > 1), "..Join(%z, %z)\n", p1, p2);
- IfTrace2((MustTraceCalls && PathDebug <= 1), "..Join(%x, %x)\n", p1, p2);
-
- /* We start with a whole bunch of very straightforward argument tests: */
- if (p2 != NULL)
- {
- if (!ISPATHTYPE(p2->type))
- {
-
- if (p1 == NULL)
- return ((struct segment *)Unique(p2));
-
- switch (p1->type)
- {
-
- case REGIONTYPE:
-
- case STROKEPATHTYPE:
- p1 = CoercePath(p1);
- break;
-
- default:
- return ((struct segment *)BegHandle(p1, p2));
- }
- }
-
- ARGCHECK((p2->last == NULL), "Join: right arg not anchor", p2, NULL, (1, p1,NULL,NULL), struct segment *);
-
- p2 = UniquePath(p2);
-
- /*
- * In certain circumstances, we don't have to duplicate a permanent
- * location. (We would just end up destroying it anyway). These cases
- * are when 'p2' begins with a move-type segment:
- */
- if (p2->type == TEXTTYPE || p2->type == MOVETYPE)
- {
- if (p1 == NULL)
- return (p2);
- if (ISLOCATION(p1))
- {
- p2->dest.x += p1->dest.x;
- p2->dest.y += p1->dest.y;
- ConsumePath(p1);
- return (p2);
- }
- }
- }
- else
- return ((struct segment *)Unique(p1));
-
- if (p1 != NULL)
- {
- if (!ISPATHTYPE(p1->type))
-
- switch (p2->type)
- {
-
- case REGIONTYPE:
-
- case STROKEPATHTYPE:
- p2 = CoercePath(p2);
- break;
-
- default:
- return ((struct segment *)EndHandle(p1, p2));
- }
-
- ARGCHECK((p1->last == NULL), "Join: left arg not anchor", p1, NULL, (1, p2,NULL,NULL), struct segment *);
-
- p1 = UniquePath(p1);
- }
- else
- return (p2);
-
- /*
- * At this point all the checking is done. We have two temporary non-null
- * path types in 'p1' and 'p2'. If p1 ends with a MOVE, and p2 begins with
- * a MOVE, we collapse the two MOVEs into one. We enforce the rule that
- * there may not be two MOVEs in a row:
- */
-
- if (p1->last->type == MOVETYPE && p2->type == MOVETYPE)
- {
- p1->last->flag |= p2->flag;
- p1->last->dest.x += p2->dest.x;
- p1->last->dest.y += p2->dest.y;
- POP(p2);
- if (p2 == NULL)
- return (p1);
- }
- /*
- * Now we check for another silly rule. If a path has any TEXTTYPEs,
- * then it must have only TEXTTYPEs and MOVETYPEs, and furthermore,
- * it must begin with a TEXTTYPE. This rule makes it easy to check
- * for the special case of text. If necessary, we will coerce
- * TEXTTYPEs into paths so we don't mix TEXTTYPEs with normal paths.
- */
- if (p1->type == TEXTTYPE)
- {
- if (p2->type != TEXTTYPE && !ISLOCATION(p2))
- p1 = CoerceText(p1);
- }
- else
- {
- if (p2->type == TEXTTYPE)
- {
- if (ISLOCATION(p1))
- {
- p2->dest.x += p1->dest.x;
- p2->dest.y += p1->dest.y;
- Free(p1);
- return (p2);
- }
- else
- p2 = CoerceText(p2);
- }
- }
- /*
- * Thank God! Finally! It's hard to believe, but we are now able to
- * actually do the join. This is just invoking the CONCAT macro:
- */
- CONCAT(p1, p2);
-
- return (p1);
- }
-
-
- /*
- * JoinSegment() - Create a Path Segment and Join It to a Known Path
- *
- * This internal function is quicker than a full-fledged join because
- * it can do much less checking.
- */
- struct segment *t1_JoinSegment(
- struct segment *before, /* path to join before new segment */
- int type, /* type of new segment (MOVETYPE or LINETYPE) */
- fractpel x, fractpel y, /* x,y of new segment */
- struct segment *after) /* path to join after new segment */
- {
- struct segment *r; /* returned path built here */
-
- r = PathSegment(type, x, y);
- if (before != NULL)
- {
- CONCAT(before, r);
- r = before;
- }
- else
- r->context = after->context;
- if (after != NULL)
- CONCAT(r, after);
- return (r);
- }
-
-
- /*
- * Other Path Functions
- */
-
- struct segment *t1_ClosePath(
- struct segment *p0, /* path to close */
- int lastonly) /* flag deciding to close all subpaths or... */
- {
- struct segment *p, *last, *start; /* used in looping through path */
- fractpel x, y; /* current position in path */
- fractpel firstx, firsty; /* start position of sub path */
- struct segment *lastnonhint; /* last non-hint segment in path */
-
- IfTrace1((MustTraceCalls), "ClosePath(%z)\n", p0);
- if (p0 != NULL && p0->type == TEXTTYPE)
- return (UniquePath(p0));
- if (p0->type == STROKEPATHTYPE)
- return ((struct segment *)Unique(p0));
- /*
- * NOTE: a null closed path is different from a null open path
- * and is denoted by a closed (0,0) move segment. We make
- * sure this path begins and ends with a MOVETYPE:
- */
- if (p0 == NULL || p0->type != MOVETYPE)
- p0 = JoinSegment(NULL, MOVETYPE, 0, 0, p0);
- TYPECHECK("ClosePath", p0, MOVETYPE, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- if (p0->last->type != MOVETYPE)
- p0 = JoinSegment(p0, MOVETYPE, 0, 0, NULL);
-
- p0 = UniquePath(p0);
-
- /*
- * We now begin a loop through the path,
- * incrementing current 'x' and 'y'. We are searching
- * for MOVETYPE segments (breaks in the path) that are not already closed.
- * At each break, we insert a close segment.
- */
- for (p = p0, x = y = 0, start = NULL;
- p != NULL;
- x += p->dest.x, y += p->dest.y, last = p, p = p->link)
- {
-
- if (p->type == MOVETYPE)
- {
- if (start != NULL && (lastonly ? p->link == NULL : TRUE) &&
- !(ISCLOSED(start->flag) && LASTCLOSED(last->flag)))
- {
- register struct segment *r; /* newly created */
-
- start->flag |= ISCLOSED(ON);
- r = PathSegment(LINETYPE, firstx - x,
- firsty - y);
- INSERT(last, r, p);
- r->flag |= LASTCLOSED(ON);
- /*< adjust 'last' if possible for a 0,0 close >*/
- {
-
- #define CLOSEFUDGE 3 /* if we are this close, let's change last segment */
-
- if (r->dest.x != 0 || r->dest.y != 0)
- {
- if (r->dest.x <= CLOSEFUDGE && r->dest.x >= -CLOSEFUDGE
- && r->dest.y <= CLOSEFUDGE && r->dest.y >= -CLOSEFUDGE)
- {
- IfTrace2((PathDebug),
- "ClosePath forced closed by (%p,%p)\n",
- r->dest.x, r->dest.y);
- lastnonhint->dest.x += r->dest.x;
- lastnonhint->dest.y += r->dest.y;
- r->dest.x = r->dest.y = 0;
- }
- }
- }
- if (p->link != NULL)
- {
- p->dest.x += x - firstx;
- p->dest.y += y - firsty;
- x = firstx;
- y = firsty;
- }
- }
- start = p;
- firstx = x + p->dest.x;
- firsty = y + p->dest.y;
- }
- else if (p->type != HINTTYPE)
- lastnonhint = p;
- }
- return (p0);
- }
-
-
- /*
- * Reversing the Direction of a Path
- *
- * This turned out to be more difficult than I thought at first. The
- * trickiness was due to the fact that closed paths must remain closed,
- * etc.
- *
- * We need three subroutines:
- *
- * break a path at any point:
- * static struct segment *SplitPath();
- *
- * break a path after first sub-path:
- * static struct segment *DropSubPath();
- *
- * reverse a single sub-path:
- * static struct segment *ReverseSubPath();
- */
-
-
- /*
- * Reverse() - User Operator to Reverse a Path
- *
- * This operator reverses the entire path.
- */
- struct segment *Reverse(
- struct segment *p) /* full path to reverse */
- {
- struct segment *r; /* output path built here */
- struct segment *nextp; /* contains next sub-path */
-
- IfTrace1((MustTraceCalls), "Reverse(%z)\n", p);
-
- if (p == NULL)
- return (NULL);
-
- ARGCHECK(!ISPATHANCHOR(p), "Reverse: invalid path", p, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- if (p->type == TEXTTYPE)
- p = CoerceText(p);
- p = UniquePath(p);
-
- r = NULL;
-
- do
- {
- nextp = DropSubPath(p);
- p = ReverseSubPath(p);
- r = Join(p, r);
- p = nextp;
-
- }
- while (p != NULL);
-
- return (r);
- }
-
-
- /*
- * ReverseSubPath() - Subroutine to Reverse a Single Sub-Path
- */
- static struct segment *ReverseSubPath(
- struct segment *p) /* input path */
- {
- struct segment *r; /* reversed path will be created here */
- struct segment *nextp; /* temporary variable used in loop */
- int wasclosed; /* flag, path was closed */
-
- if (p == NULL)
- return (NULL);
-
- wasclosed = ISCLOSED(p->flag);
- r = NULL;
-
- do
- {
- /*
- * First we reverse the direction of this segment and clean up its flags:
- */
- p->dest.x = -p->dest.x;
- p->dest.y = -p->dest.y;
- p->flag &= ~(ISCLOSED(ON) | LASTCLOSED(ON));
-
- switch (p->type)
- {
-
- case LINETYPE:
- case MOVETYPE:
- break;
-
- case CONICTYPE:
- {
- /*
- * The logic of this is that the new M point (stored relative to the new
- * beginning) is (M - C). However, C ("dest") has already been reversed
- * So, we add "dest" instead of subtracting it:
- */
- register struct conicsegment *cp = (struct conicsegment *)p;
-
- cp->M.x += cp->dest.x;
- cp->M.y += cp->dest.y;
- }
- break;
-
- case BEZIERTYPE:
- {
- register struct beziersegment *bp = (struct beziersegment *)p;
-
- bp->B.x += bp->dest.x;
- bp->B.y += bp->dest.y;
- bp->C.x += bp->dest.x;
- bp->C.y += bp->dest.y;
- }
- break;
-
- case HINTTYPE:
- {
- register struct hintsegment *hp = (struct hintsegment *)p;
-
- hp->ref.x = -hp->ref.x;
- hp->ref.y = -hp->ref.y;
- }
- break;
-
- default:
- t1_abort("Reverse: bad path segment");
- }
- /*
- * We need to reverse the order of segments too, so we break this segment
- * off of the input path, and tack it on the front of the growing path
- * in 'r':
- */
- nextp = p->link;
- p->link = NULL;
- p->last = p;
- if (r != NULL)
- CONCAT(p, r); /* leaves result in 'p'... not what we want */
- r = p;
- p = nextp; /* advance to next segment in input path */
-
- }
- while (p != NULL);
-
- if (wasclosed)
- r = ClosePath(r);
-
- return (r);
- }
-
-
- /*
- * DropSubPath() - Drops the First Sub-Path Off a Path
- *
- * This subroutine returns the remaining sub-path(s). While doing so, it
- * breaks the input path after the first sub-path so that a pointer to
- * the original path now contains the first sub-path only.
- */
- static struct segment *DropSubPath(
- struct segment *p0) /* original path */
- {
- struct segment *p; /* returned remainder here */
-
- for (p = p0; p->link != NULL; p = p->link)
- {
- if (p->link->type == MOVETYPE)
- break;
- }
-
- return (SplitPath(p0, p));
- }
-
-
- static struct segment *SplitPath(struct segment *anchor, struct segment *before)
- {
- struct segment *r;
-
- if (before == anchor->last)
- return (NULL);
-
- r = before->link;
- r->last = anchor->last;
- anchor->last = before;
- before->link = NULL;
-
- return (r);
- }
-
-
- /*
- * ReverseSubPaths() - Reverse the Direction of Sub-paths Within a Path
- *
- * This user operator reverses the sub-paths in a path, but leaves the
- * 'move' segments unchanged. It builds on top of the subroutines
- * already established.
- */
- struct segment *ReverseSubPaths(
- struct segment *p) /* input path */
- {
- struct segment *r; /* reversed path will be created here */
- struct segment *nextp; /* temporary variable used in loop */
- int wasclosed; /* flag; subpath was closed */
- struct segment *nomove; /* the part of sub-path without move segment */
- struct fractpoint delta;
-
- IfTrace1((MustTraceCalls), "ReverseSubPaths(%z)\n", p);
-
- if (p == NULL)
- return (NULL);
-
- ARGCHECK(!ISPATHANCHOR(p), "ReverseSubPaths: invalid path", p, NULL, (0,NULL,NULL,NULL), struct segment *);
-
- if (p->type == TEXTTYPE)
- p = CoerceText(p);
- if (p->type != MOVETYPE)
- p = JoinSegment(NULL, MOVETYPE, 0, 0, p);
-
- p = UniquePath(p);
-
- r = NULL;
-
- for (; p != NULL;)
- {
- nextp = DropSubPath(p);
- wasclosed = ISCLOSED(p->flag);
- if (wasclosed)
- UnClose(p);
-
- nomove = SplitPath(p, p);
- r = Join(r, p);
-
- PathDelta(nomove, &delta);
-
- nomove = ReverseSubPath(nomove);
- p->dest.x += delta.x;
- p->dest.y += delta.y;
- if (nextp != NULL)
- {
- nextp->dest.x += delta.x;
- nextp->dest.y += delta.y;
- }
- if (wasclosed)
- {
- nomove = ClosePath(nomove);
- nextp->dest.x -= delta.x;
- nextp->dest.y -= delta.y;
- }
- r = Join(r, nomove);
- p = nextp;
-
- }
-
- return (r);
- }
-
-
- static void UnClose(struct segment *p0)
- {
- struct segment *p;
-
- for (p = p0; p->link->link != NULL; p = p->link)
- {;
- }
-
- if (!LASTCLOSED(p->link->flag))
- t1_abort("UnClose: no LASTCLOSED");
-
- Free(SplitPath(p0, p));
- p0->flag &= ~ISCLOSED(ON);
- }
-
-
- /*
- * Transforming and Putting Handles on Paths
- *
- * PathTransform() - Transform a Path
- *
- * Transforming a path involves transforming all the points. In order
- * that closed paths do not become "unclosed" when their relative
- * positions are slightly changed due to loss of arithmetic precision,
- * all point transformations are in absolute coordinates.
- *
- * (It might be better to reset the "absolute" coordinates every time a
- * move segment is encountered. This would mean that we could accumulate
- * error from subpath to subpath, but we would be less likely to make
- * the "big error" where our fixed point arithmetic "wraps". However, I
- * think I'll keep it this way until something happens to convince me
- * otherwise.)
- *
- * The transform is described as a "space", that way we can use our
- * old friend the "iconvert" function, which should be very efficient.
- */
- struct segment *PathTransform(
- struct segment *p0, /* path to transform */
- struct XYspace *S) /* pseudo space to transform in */
- {
- struct segment *p; /* to loop through path with */
- fractpel newx, newy; /* current transformed position in path */
- fractpel oldx, oldy; /* current untransformed position in path */
- fractpel savex, savey; /* save path delta x,y */
-
- p0 = UniquePath(p0);
-
- newx = newy = oldx = oldy = 0;
-
- for (p = p0; p != NULL; p = p->link)
- {
-
- savex = p->dest.x;
- savey = p->dest.y;
-
- (*S->iconvert) (&p->dest, S, p->dest.x + oldx, p->dest.y + oldy);
- p->dest.x -= newx;
- p->dest.y -= newy;
-
- switch (p->type)
- {
-
- case LINETYPE:
- case MOVETYPE:
- break;
-
- case CONICTYPE:
- {
- register struct conicsegment *cp = (struct conicsegment *)p;
-
- (*S->iconvert) (&cp->M, S, cp->M.x + oldx, cp->M.y + oldy);
- cp->M.x -= newx;
- cp->M.y -= newy;
- /*
- * Note roundness doesn't change... linear transform
- */
- break;
- }
-
-
- case BEZIERTYPE:
- {
- register struct beziersegment *bp = (struct beziersegment *)p;
-
- (*S->iconvert) (&bp->B, S, bp->B.x + oldx, bp->B.y + oldy);
- bp->B.x -= newx;
- bp->B.y -= newy;
- (*S->iconvert) (&bp->C, S, bp->C.x + oldx, bp->C.y + oldy);
- bp->C.x -= newx;
- bp->C.y -= newy;
- break;
- }
-
- case HINTTYPE:
- {
- register struct hintsegment *hp = (struct hintsegment *)p;
-
- (*S->iconvert) (&hp->ref, S, hp->ref.x + oldx, hp->ref.y + oldy);
- hp->ref.x -= newx;
- hp->ref.y -= newy;
- (*S->iconvert) (&hp->width, S, hp->width.x, hp->width.y);
- /* Note: width is not relative to origin */
- break;
- }
-
- case TEXTTYPE:
- {
- XformText(p, S);
- break;
- }
-
- default:
- IfTrace1(TRUE, "path = %z\n", p);
- t1_abort("PathTransform: invalid segment");
- }
- oldx += savex;
- oldy += savey;
- newx += p->dest.x;
- newy += p->dest.y;
- }
- return (p0);
- }
-
-
- /*
- * PathDelta() - Return a Path's Ending Point
- */
- void t1_PathDelta(
- struct segment *p, /* input path */
- struct fractpoint *pt) /* pointer to x,y to set */
- {
- struct fractpoint mypoint; /* I pass this to TextDelta */
- fractpel x, y; /* working variables for path current point */
-
- for (x = y = 0; p != NULL; p = p->link)
- {
- x += p->dest.x;
- y += p->dest.y;
- if (p->type == TEXTTYPE)
- {
- TextDelta(p, &mypoint);
- x += mypoint.x;
- y += mypoint.y;
- }
- }
-
- pt->x = x;
- pt->y = y;
- }
-
-
- /*
- * BoundingBox() - Produce a Bounding Box Path
- *
- * This function is called by image code, when we know the size of the
- * image in pels, and need to get a bounding box path that surrounds it.
- * The starting/ending handle is in the lower right hand corner.
- */
- struct segment *BoundingBox(
- pel h, pel w) /* size of box */
- {
- struct segment *path;
-
- path = PathSegment(LINETYPE, -TOFRACTPEL(w), 0);
- path = JoinSegment(NULL, LINETYPE, 0, -TOFRACTPEL(h), path);
- path = JoinSegment(NULL, LINETYPE, TOFRACTPEL(w), 0, path);
- path = ClosePath(path);
-
- return (path);
- }
-
-
- /*
- * Querying Locations and Paths
- *
- * QueryLoc() - Return the X,Y of a Locition
- */
- void QueryLoc(
- struct segment *P, /* location to query, not consumed */
- struct XYspace *S, /* XY space to return coordinates in */
- double *xP, double *yP) /* coordinates returned here */
- {
- IfTrace4((MustTraceCalls), "QueryLoc(P=%z, S=%z, (%x, %x))\n",
- P, S, xP, yP);
- if (!ISLOCATION(P))
- {
- ArgErr("QueryLoc: first arg not a location", P, NULL);
- return;
- }
- if (S->type != SPACETYPE)
- {
- ArgErr("QueryLoc: second arg not a space", S, NULL);
- return;
- }
- UnConvert(S, &P->dest, xP, yP);
- }
-
-
- /*
- * QueryPath() - Find Out the Type of Segment at the Head of a Path
- *
- * This is a very simple routine that looks at the first segment of a
- * path and tells the caller what it is, as well as returning the control
- * point(s) of the path segment. Different path segments have different
- * number of control points. If the caller knows that the segment is
- * a move segment, for example, he only needs to pass pointers to return
- * one control point.
- */
- void QueryPath(
- struct segment *path, /* path to check */
- int *typeP, /* return the type of path here */
- struct segment **Bp, /* return location of first point */
- struct segment **Cp, /* return location of second point */
- struct segment **Dp, /* return location of third point */
- double *fP) /* return Conic sharpness */
- {
- int coerced = FALSE; /* did I coerce a text path? */
-
- IfTrace3((MustTraceCalls), "QueryPath(%z, %x, %x, ...)\n",
- path, typeP, Bp);
- if (path == NULL)
- {
- *typeP = -1;
- return;
- }
- if (!ISPATHANCHOR(path))
- {
- ArgErr("QueryPath: arg not a valid path", path, NULL);
- }
- if (path->type == TEXTTYPE)
- {
- path = CoerceText(path);
- coerced = TRUE;
- }
-
- switch (path->type)
- {
-
- case MOVETYPE:
- *typeP = 0;
- *Bp = PathSegment(MOVETYPE, path->dest.x, path->dest.y);
- break;
-
- case LINETYPE:
- *typeP = (LASTCLOSED(path->flag)) ? 4 : 1;
- *Bp = PathSegment(MOVETYPE, path->dest.x, path->dest.y);
- break;
-
- case CONICTYPE:
- {
- register struct conicsegment *cp = (struct conicsegment *)path;
-
- *typeP = 2;
- *Bp = PathSegment(MOVETYPE, cp->M.x, cp->M.y);
- *Cp = PathSegment(MOVETYPE, cp->dest.x, cp->dest.y);
- *fP = cp->roundness;
- }
- break;
-
- case BEZIERTYPE:
- {
- register struct beziersegment *bp = (struct beziersegment *)path;
-
- *typeP = 3;
- *Bp = PathSegment(MOVETYPE, bp->B.x, bp->B.y);
- *Cp = PathSegment(MOVETYPE, bp->C.x, bp->C.y);
- *Dp = PathSegment(MOVETYPE, bp->dest.x, bp->dest.y);
- }
- break;
-
- case HINTTYPE:
- *typeP = 5;
- break;
-
- default:
- t1_abort("QueryPath: unknown segment");
- }
- if (coerced)
- KillPath(path);
- }
-
-
- /*
- * QueryBounds() - Return the Bounding Box of a Path
- *
- * Returns the bounding box by setting the user's variables.
- */
- void QueryBounds(
- struct segment *p0, /* object to check for bound */
- struct XYspace *S, /* coordinate space of returned values */
- double *xminP,
- double *yminP, /* lower left hand corner (set by routine) */
- double *xmaxP,
- double *ymaxP) /* upper right hand corner (set by routine) */
- {
- struct segment *path; /* loop variable for path segments */
- fractpel lastx, lasty; /* loop variables: previous endingpoint */
- fractpel x, y; /* loop variables: current ending point */
- struct fractpoint min; /* registers to keep lower left hand corner */
- struct fractpoint max; /* registers to keep upper right hand corner */
- int coerced = FALSE; /* we have coerced the path from another object */
- double x1, y1, x2, y2, x3, y3, x4, y4; /* corners of rectangle in space X */
-
- IfTrace2((MustTraceCalls), "QueryBounds(%z, %z,", p0, S);
- IfTrace4((MustTraceCalls), " %x, %x, %x, %x)\n",
- xminP, yminP, xmaxP, ymaxP);
- if (S->type != SPACETYPE)
- {
- ArgErr("QueryBounds: bad XYspace", S, NULL);
- return;
- }
-
- min.x = min.y = max.x = max.y = 0;
- if (p0 != NULL)
- {
- if (!ISPATHANCHOR(p0))
- {
- switch (p0->type)
- {
- case STROKEPATHTYPE:
- /* replaced DupStrokePath() with Dup() 3-26-91 PNM */
- p0 = (struct segment *)DoStroke(Dup(p0));
- /* no break here, we have a region in p0 */
- case REGIONTYPE:
- p0 = RegionBounds(p0);
- break;
-
- case PICTURETYPE:
- p0 = PictureBounds(p0);
- break;
-
- default:
- ArgErr("QueryBounds: bad object", p0, NULL);
- return;
- }
- coerced = TRUE;
- }
- if (p0->type == TEXTTYPE)
- {
- /* replaced CopyPath() with Dup() 3-26-91 PNM */
- p0 = (struct segment *)CoerceText(Dup(p0)); /* there are faster ways */
- coerced = TRUE;
- }
- if (p0->type == MOVETYPE)
- {
- min.x = max.x = p0->dest.x;
- min.y = max.y = p0->dest.y;
- }
- }
- lastx = lasty = 0;
-
- for (path = p0; path != NULL; path = path->link)
- {
-
- x = lastx + path->dest.x;
- y = lasty + path->dest.y;
-
- switch (path->type)
- {
-
- case LINETYPE:
- break;
-
- case CONICTYPE:
- {
- register struct conicsegment *cp = (struct conicsegment *)path;
- register fractpel Mx = lastx + cp->M.x;
- register fractpel My = lasty + cp->M.y;
- register fractpel deltax = 0.5 * cp->roundness * cp->dest.x;
- register fractpel deltay = 0.5 * cp->roundness * cp->dest.y;
- register fractpel Px = Mx - deltax;
- register fractpel Py = My - deltay;
- register fractpel Qx = Mx + deltax;
- register fractpel Qy = My + deltay;
-
-
- if (Mx < min.x)
- min.x = Mx;
- else if (Mx > max.x)
- max.x = Mx;
- if (My < min.y)
- min.y = My;
- else if (My > max.y)
- max.y = My;
-
- if (Px < min.x)
- min.x = Px;
- else if (Px > max.x)
- max.x = Px;
- if (Py < min.y)
- min.y = Py;
- else if (Py > max.y)
- max.y = Py;
-
- if (Qx < min.x)
- min.x = Qx;
- else if (Qx > max.x)
- max.x = Qx;
- if (Qy < min.y)
- min.y = Qy;
- else if (Qy > max.y)
- max.y = Qy;
- }
- break;
-
-
- case MOVETYPE:
- /*
- * We can't risk adding trailing Moves to the
- * bounding box:
- */
- if (path->link == NULL)
- goto done; /* God forgive me */
- break;
-
- case BEZIERTYPE:
- {
- register struct beziersegment *bp = (struct beziersegment *)path;
- register fractpel Bx = lastx + bp->B.x;
- register fractpel By = lasty + bp->B.y;
- register fractpel Cx = lastx + bp->C.x;
- register fractpel Cy = lasty + bp->C.y;
-
- if (Bx < min.x)
- min.x = Bx;
- else if (Bx > max.x)
- max.x = Bx;
- if (By < min.y)
- min.y = By;
- else if (By > max.y)
- max.y = By;
-
- if (Cx < min.x)
- min.x = Cx;
- else if (Cx > max.x)
- max.x = Cx;
- if (Cy < min.y)
- min.y = Cy;
- else if (Cy > max.y)
- max.y = Cy;
- }
- break;
-
- case HINTTYPE:
- break;
- default:
- t1_abort("QueryBounds: unknown type");
- }
-
- if (x < min.x)
- min.x = x;
- else if (x > max.x)
- max.x = x;
- if (y < min.y)
- min.y = y;
- else if (y > max.y)
- max.y = y;
-
- lastx = x;
- lasty = y;
- }
- done:
- UnConvert(S, &min, &x1, &y1);
- UnConvert(S, &max, &x4, &y4);
- x = min.x;
- min.x = max.x;
- max.x = x;
- UnConvert(S, &min, &x2, &y2);
- UnConvert(S, &max, &x3, &y3);
-
- *xminP = *xmaxP = x1;
- if (x2 < *xminP)
- *xminP = x2;
- else if (x2 > *xmaxP)
- *xmaxP = x2;
- if (x3 < *xminP)
- *xminP = x3;
- else if (x3 > *xmaxP)
- *xmaxP = x3;
- if (x4 < *xminP)
- *xminP = x4;
- else if (x4 > *xmaxP)
- *xmaxP = x4;
-
- *yminP = *ymaxP = y1;
- if (y2 < *yminP)
- *yminP = y2;
- else if (y2 > *ymaxP)
- *ymaxP = y2;
- if (y3 < *yminP)
- *yminP = y3;
- else if (y3 > *ymaxP)
- *ymaxP = y3;
- if (y4 < *yminP)
- *yminP = y4;
- else if (y4 > *ymaxP)
- *ymaxP = y4;
-
- if (coerced)
- Destroy(p0);
- }
-
-
- /*
- * BoxPath()
- */
- struct segment *BoxPath(struct XYspace *S, int h, int w)
- {
- struct segment *path;
-
- path = Join(Line(ILoc(S, w, 0)), Line(ILoc(S, 0, h)));
- path = JoinSegment(path, LINETYPE, -path->dest.x, -path->dest.y, NULL);
- return (ClosePath(path));
- }
-
-
- /*
- * DropSegment() - Drop the First Segment in a Path
- *
- * This routine takes the path and returns a new path that is one segment
- * shorter. It can be used in conjunction with QueryPath(), for example,
- * to ask about an entire path.
- */
- struct segment *DropSegment(struct segment *path)
- {
- IfTrace1((MustTraceCalls), "DropSegment(%z)\n", path);
- if (path != NULL && path->type == STROKEPATHTYPE)
- path = CoercePath(path);
- ARGCHECK((path == NULL || !ISPATHANCHOR(path)),
- "DropSegment: arg not a non-null path", path, path, (0,NULL,NULL,NULL), struct segment *);
-
- if (path->type == TEXTTYPE)
- path = CoerceText(path);
- path = UniquePath(path);
-
- POP(path);
- return (path);
- }
-
-
- /*
- * HeadSegment() - Return the First Segment in a Path
- *
- * This routine takes the path and returns a new path consists of the
- * first segment only.
- */
- struct segment *HeadSegment(
- struct segment *path) /* input path */
- {
- IfTrace1((MustTraceCalls), "HeadSegment(%z)\n", path);
- if (path == NULL)
- return (NULL);
- if (path->type == STROKEPATHTYPE)
- path = CoercePath(path);
- ARGCHECK(!ISPATHANCHOR(path), "HeadSegment: arg not a path", path, path, (0,NULL,NULL,NULL), struct segment *);
-
- if (path->type == TEXTTYPE)
- path = CoerceText(path);
- path = UniquePath(path);
-
- if (path->link != NULL)
- KillPath(path->link);
- path->link = NULL;
- path->last = path;
- return (path);
- }
-
-
- #ifdef AMISHDEBUG
-
- /*
- * Path Debug Routines
- *
- * DumpPath() - Display a Path on the Trace File
- */
- void DumpPath(struct segment *p)
- {
- fractpel x, y;
- fractpel lastx, lasty;
- double roundness;
-
- IfTrace1(TRUE, "Dumping path, anchor=%x:\n", p);
- lastx = lasty = 0;
-
- for (; p != NULL; p = p->link)
- {
-
- IfTrace0(TRUE, ". ");
- x = p->dest.x;
- y = p->dest.y;
- switch (p->type)
- {
-
- case LINETYPE:
- IfTrace1(TRUE, ". line<%x> to", (long)p->flag);
- IfTrace4(TRUE, " (%p,%p), delta=(%p,%p)",
- x + lastx, y + lasty, x, y);
- break;
-
- case MOVETYPE:
- IfTrace1(TRUE, "MOVE<%x> to", (long)p->flag);
- IfTrace4(TRUE, "(%p,%p), delta=(%p,%p)",
- x + lastx, y + lasty, x, y);
- break;
-
- case CONICTYPE:
- {
- register struct conicsegment *cp = (struct conicsegment *)p;
-
- roundness = cp->roundness;
- IfTrace2(TRUE, ". conic to (%p,%p),",
- x + lastx, y + lasty);
- IfTrace3(TRUE, " M=(%p,%p), r=%f", cp->M.x + lastx,
- cp->M.y + lasty, &roundness);
- }
- break;
-
- case BEZIERTYPE:
- {
- register struct beziersegment *bp = (struct beziersegment *)p;
-
- IfTrace4(TRUE, ". bezier to (%p,%p), B=(%p,%p)",
- x + lastx, y + lasty,
- bp->B.x + lastx, bp->B.y + lasty);
- IfTrace2(TRUE, ", C=(%p,%p)",
- bp->C.x + lastx, bp->C.y + lasty);
- }
- break;
-
- case HINTTYPE:
- {
- register struct hintsegment *hp = (struct hintsegment *)p;
-
- IfTrace4(TRUE, ". hint ref=(%p,%p), width=(%p,%p)",
- hp->ref.x + lastx, hp->ref.y + lasty,
- hp->width.x, hp->width.y);
- IfTrace4(TRUE, ", %c %c %c %c",
- hp->orientation, hp->hinttype,
- hp->adjusttype, hp->direction);
- IfTrace1(TRUE, ", %ld", (long)hp->label);
- }
- break;
-
- case TEXTTYPE:
- // DumpText(p);
- // DumpText();
- break;
-
- default:
- IfTrace0(TRUE, "bad path segment?");
- }
- IfTrace1(TRUE, " at %x\n", p);
- lastx += x;
- lasty += y;
- }
- }
-
- #endif
-