cid_mkmap.c

/*
  cid_mkmap.c -- make array of glyph ids from cid
  Copyright (C) 1999 Dieter Baron

  This file is part of ttftot42, to use TrueType fonts in PostScript.
  The author can be contacted at <dillo@giga.or.at>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The name of the author may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "t42.h"

struct cmap_feature {
    TT_UShort sidx, lidx, fidx;
};

struct cmap_state {
    int valid;
    TT_CharMap cmap;
    int nvert, nfeature;
    struct cmap_feature *vert, feature;
};

#ifdef HAVE_GSUB
static int get_feature(font *f, struct cid_feature *feature,
		       struct cmap_feature *feat)
#endif



int
cid_mkmap(struct font *f, struct cid *cid, unsigned short **mapp)
{
    struct cmap_state *state;
    unsigned short *map;
    int valid, v, flags;
    int i, j, ncid;
#ifdef HAVE_GSUB
    int k;
#endif
    unsigned short pl, en;

    state = (struct cmap_state *)xmalloc(sizeof(struct cmap_state)*cid->ncmap);

    valid = 0;
    for (i=0; i<cid->ncmap; i++) {
	state[i].valid = 0;
	for (j=0; j<f->ncmaps; j++) {
	    TT_Get_CharMap_ID(f->face, j, &pl, &en);
	    if ((pl == cid->cmap[i].pid && en == cid->cmap[i].eid)) {
		if (TT_Get_CharMap(f->face, i, &state[i].cmap) == TT_Err_Ok)
		    valid = state[i].valid = 1;
		break;
	    }
	}
	if (state[i].valid) {
	    cid_decode_init(cid->cmap[i].code);
#ifdef HAVE_GSUB
	    if (cid->cmap[i].nvert)
		state[i].vert
		    = (struct cmap_feature *)xmalloc(sizeof(struct
							    cmap_feature)
						     * cid->cmap[i].nvert);
	    else
		state[i].vert = NULL;
	    if (cid->cmap[i].nfeature)
		state[i].feature
		    = (struct cmap_feature *)xmalloc(sizeof(struct
							    cmap_feature)
						     * cid->cmap[i].nfeature);
	    else
		state[i].feature = NULL;
	    state[i].nvert = state[i].nfeature = 0;
	    for (k=0; k<cid->cmap[i].nvert; k++) {
		if (get_feature(f->face,
				cid->cmap[i].vert+k,
				state[i].vert+state[i].nvert) == 0)
		    state[i].nvert++;
	    }
	    for (k=0; k<cid->cmap[i].nfeature; k++) {
		if (get_feature(f->face,
				cid->cmap[i].feature+k,
				state[i].feature+state[i].nfeature) == 0)
		    state[i].nfeature++;
	    }
#endif /* HAVE_GSUB */
	}
    }

    if (valid == 0) {
	/* XXX: no suitable charmap found */
	return -1;
    }

    map = (unsigned short *)xmalloc(sizeof(unsigned short)
				    * cid->supl_ncid[cid->supplement]);

    ncid = 0;
    for (i=0; i<cid->supl_ncid[cid->supplement]; i++) {
	map[i] = 0;
	for (j=0; j<cid->ncmap; j++) {
	    do {
		flags = cid_decode(cid->cmap[j].code, &v);
		if ((flags & CID_NENC) == 0 && state[j].valid && map[i] == 0) {
		    if ((v=TT_Char_Index(state[j].cmap, v)) != 0) {
			/* XXX: apply vert & feature */
#ifdef HAVE_GSUB
			if (flags & CID_VERT) {
			    v = apply_features(f, state[j].nvert,
					       state[j].vert, v);
			}
			v = apply_features(f, state[j].nfeature,
					   state[j].feature, v);
			map[i] = v;
			ncid = i;
#else /* HAVE_GSUB */
			if (!(flags & CID_VERT)) {
			    map[i] = v;
			    ncid = i;
			}
#endif
		    }
		}
	    } while (flags & CID_ALT);
	}
    }

    *mapp = map;
    
#ifdef HAVE_GSUB
    for (i=0; i<cid->ncmap; i++) {
	if (state[i].valid) {
	    free(state[i].vert);
	    free(state[i].feature);
	}
    }
#endif HAVE_GSUB

    return ncid+1;
}



#ifdef HAVE_GSUB

static int
get_feature(font *f, struct cid_feature *feature, struct cmap_feature *feat)
{
    if (TT_GSUB_Select_Script(f->gsub, feature->script, &feat->sidx))
	return -1;
    if (TT_GSUB_Select_Language(f->gsub, feature->language,
				feat->sidx, &feat->lidx))
	return -1;
    if (TT_GSUB_Select_Feature(f->gsub, feature->feature,
			       feat->sidx, feat->lidx, &feat->fidx))
	return -1;
    return 0;
}



static int
apply_features(font *f, int n, struct cmap_feature *feat, int v)
{
    /* XXX: FreeType 1.2 doesn't implement TTO_GSUB_Apply */
    return v;
}
#endif /* HAVE_GSUB */