/* Copyright (C) 1995, 1996, 1997, 1998 Aladdin Enterprises.  All rights reserved.

   This file is part of Aladdin Ghostscript.

   Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
   or distributor accepts any responsibility for the consequences of using it,
   or for whether it serves any particular purpose or works at all, unless he
   or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
   License (the "License") for full details.

   Every copy of Aladdin Ghostscript must include a copy of the License,
   normally in a plain ASCII text file named PUBLIC.  The License grants you
   the right to copy, modify and redistribute Aladdin Ghostscript, but only
   under certain conditions described in the License.  Among other things, the
   License requires that the copyright notice and this notice be preserved on
   all copies.
 */

/*$Id: gxpdash.c $ */
/* Dash expansion for paths */
#include "math_.h"
#include "gx.h"
#include "gsmatrix.h"		/* for gscoord.h */
#include "gscoord.h"
#include "gxfixed.h"
#include "gsline.h"
#include "gzline.h"
#include "gzpath.h"

/* Expand a dashed path into explicit segments. */
/* The path contains no curves. */
private int subpath_expand_dashes(P4(const subpath *, gx_path *,
				     const gs_imager_state *,
				     const gx_dash_params *));
int
gx_path_add_dash_expansion(const gx_path * ppath_old, gx_path * ppath,
			   const gs_imager_state * pis)
{
    const subpath *psub;
    const gx_dash_params *dash = &gs_currentlineparams(pis)->dash;
    int code = 0;

    if (dash->pattern_size == 0)
	return gx_path_copy(ppath_old, ppath);
    for (psub = ppath_old->first_subpath; psub != 0 && code >= 0;
	 psub = (const subpath *)psub->last->next
	)
	code = subpath_expand_dashes(psub, ppath, pis, dash);
    return code;
}

private int
subpath_expand_dashes(const subpath * psub, gx_path * ppath,
		   const gs_imager_state * pis, const gx_dash_params * dash)
{
    const float *pattern = dash->pattern;
    int count, index;
    bool ink_on;
    double elt_length;
    fixed x0 = psub->pt.x, y0 = psub->pt.y;
    fixed x, y;
    const segment *pseg;
    int wrap = (dash->init_ink_on && psub->is_closed ? -1 : 0);
    int drawing = wrap;
    segment_notes notes = ~sn_not_first;
    int code;

    if ((code = gx_path_add_point(ppath, x0, y0)) < 0)
	return code;
    /*
     * To do the right thing at the beginning of a closed path, we have
     * to skip any initial line, and then redo it at the end of the
     * path.  Drawing = -1 while skipping, 0 while drawing normally, and
     * 1 on the second round.  Note that drawing != 0 implies ink_on.
     */
  top:count = dash->pattern_size;
    ink_on = dash->init_ink_on;
    index = dash->init_index;
    elt_length = dash->init_dist_left;
    x = x0, y = y0;
    pseg = (const segment *)psub;
    while ((pseg = pseg->next) != 0 && pseg->type != s_start) {
	fixed sx = pseg->pt.x, sy = pseg->pt.y;
	fixed udx = sx - x, udy = sy - y;
	double length, dx, dy;
	double scale = 1;
	double left;

	if (!(udx | udy))	/* degenerate */
	    dx = 0, dy = 0, length = 0;
	else {
	    gs_point d;

	    dx = udx, dy = udy;	/* scaled as fixed */
	    gs_imager_idtransform(pis, dx, dy, &d);
	    length = hypot(d.x, d.y) * (1.0 / fixed_1);
	    if (gs_imager_currentdashadapt(pis)) {
		double reps = length / dash->pattern_length;

		scale = reps / ceil(reps);
		/* Ensure we're starting at the start of a */
		/* repetition.  (This shouldn't be necessary, */
		/* but it is.) */
		count = dash->pattern_size;
		ink_on = dash->init_ink_on;
		index = dash->init_index;
		elt_length = dash->init_dist_left * scale;
	    }
	}
	left = length;
	while (left > elt_length) {	/* We are using up the line segment. */
	    double fraction = elt_length / length;
	    fixed nx = x + (fixed) (dx * fraction);
	    fixed ny = y + (fixed) (dy * fraction);

	    if (ink_on) {
		if (drawing >= 0)
		    code = gx_path_add_line_notes(ppath, nx, ny,
						  notes & pseg->notes);
		notes |= sn_not_first;
	    } else {
		if (drawing > 0)	/* done */
		    return 0;
		code = gx_path_add_point(ppath, nx, ny);
		notes &= ~sn_not_first;
		drawing = 0;
	    }
	    if (code < 0)
		return code;
	    left -= elt_length;
	    ink_on = !ink_on;
	    if (++index == count)
		index = 0;
	    elt_length = pattern[index] * scale;
	    x = nx, y = ny;
	}
	elt_length -= left;
	/* Handle the last dash of a segment. */
      on:if (ink_on) {
	    if (drawing >= 0) {
		code =
		    (pseg->type == s_line_close && drawing > 0 ?
		     gx_path_close_subpath_notes(ppath,
						 notes & pseg->notes) :
		     gx_path_add_line_notes(ppath, sx, sy,
					    notes & pseg->notes));
		notes |= sn_not_first;
	    }
	} else {
	    code = gx_path_add_point(ppath, sx, sy);
	    notes &= ~sn_not_first;
	    if (elt_length < fixed2float(fixed_epsilon) &&
		(pseg->next == 0 || pseg->next->type == s_start)
		) {		/*
				 * Ink is off, but we're within epsilon of the end
				 * of the dash element, and at the end of the
				 * subpath.  "Stretch" a little so we get a dot.
				 */
		if (code < 0)
		    return code;
		elt_length = 0;
		ink_on = true;
		if (++index == count)
		    index = 0;
		elt_length = pattern[index] * scale;
		goto on;
	    }
	    if (drawing > 0)	/* done */
		return code;
	    drawing = 0;
	}
	if (code < 0)
	    return code;
	x = sx, y = sy;
    }
    /* Check for wraparound. */
    if (wrap && drawing <= 0) {	/* We skipped some initial lines. */
	/* Go back and do them now. */
	drawing = 1;
	goto top;
    }
    return 0;
}
