diff options
Diffstat (limited to 'dvi/mdvi-lib/fontsrch.c')
| -rw-r--r-- | dvi/mdvi-lib/fontsrch.c | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/dvi/mdvi-lib/fontsrch.c b/dvi/mdvi-lib/fontsrch.c deleted file mode 100644 index 415ed91..0000000 --- a/dvi/mdvi-lib/fontsrch.c +++ /dev/null @@ -1,370 +0,0 @@ -/* fontsearch.c -- implements the font lookup mechanism in MDVI */ -/* - * Copyright (C) 2000, Matias Atria - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -/* - * How this works: - * Fonts are divided into MAX_CLASS priority classes. The first - * MAX_CLASS-1 ones correspond to `real' fonts (pk, gf, vf, type1, truetype, - * etc). The last one corresponds to `metric' fonts that are used as a last - * resort (tfm, afm, ofm, ...). When a font is looked up, it is tried in a - * `high' priority class (0 being the highest priority). The priority is - * lowered until it reaches MAX_CLASS-1. Then the whole thing is repeated - * for the fallback font. When the search reaches MAX_CLASS-1, we lookup the - * original font, and then the fallback font. The search can be done - * incrementally, with several calls to mdvi_lookup_font(). If this function - * is called again to continue a search, the function assumes the previous - * font it returned was not valid, and it goes on to the next step. - * - * Reason for this: - * Some font types are quite expensive to load (e.g. Type1), so loading - * them is deferred until the last possible moment. This means that a font that - * was supposed to exist may have to be discarded. Until now, MDVI had no ability to - * "resume" a search, so in this case it would have produced an error, regardless - * of whether the offending font existed in other formats. - * Also, given the large number of font types supported by MDVI, some mechanism - * was necessary to bring some order into the chaos. - * - * This mechanism fixes these two problems. For the first one, a search can - * be "resumed" and all the font formats tried for the missing font, and - * again for the fallback font (see above). As for the second, the - * hierarchical division in classes gives a lot of flexibility in how the - * fonts are configured. - */ - -#include "mdvi.h" - -#define HAVE_PROTOTYPES 1 -#include <kpathsea/tex-file.h> -#include <kpathsea/tex-glyph.h> - -struct _DviFontClass { - DviFontClass *next; - DviFontClass *prev; - DviFontInfo info; - int links; - int id; -}; - -char *_mdvi_fallback_font = MDVI_FALLBACK_FONT; - -/* this leaves classes 0 and 1 for `real' fonts */ -#define MAX_CLASS 3 -static ListHead font_classes[MAX_CLASS]; -static int initialized = 0; - -static void init_font_classes(void) -{ - int i; - - for(i = 0; i < MAX_CLASS; i++) - listh_init(&font_classes[i]); - initialized = 1; -} - -int mdvi_get_font_classes(void) -{ - return (MAX_CLASS - 2); -} - -char **mdvi_list_font_class(int klass) -{ - char **list; - int i, n; - DviFontClass *fc; - - if(klass == -1) - klass = MAX_CLASS-1; - if(klass < 0 || klass >= MAX_CLASS) - return NULL; - n = font_classes[klass].count; - list = xnalloc(char *, n + 1); - fc = (DviFontClass *)font_classes[klass].head; - for(i = 0; i < n; fc = fc->next, i++) { - list[i] = mdvi_strdup(fc->info.name); - } - list[i] = NULL; - return list; -} - -int mdvi_register_font_type(DviFontInfo *info, int klass) -{ - DviFontClass *fc; - - if(klass == -1) - klass = MAX_CLASS-1; - if(klass < 0 || klass >= MAX_CLASS) - return -1; - if(!initialized) - init_font_classes(); - fc = xalloc(struct _DviFontClass); - fc->links = 0; - fc->id = klass; - fc->info.name = mdvi_strdup(info->name); - fc->info.scalable = info->scalable; - fc->info.load = info->load; - fc->info.getglyph = info->getglyph; - fc->info.shrink0 = info->shrink0; - fc->info.shrink1 = info->shrink1; - fc->info.freedata = info->freedata; - fc->info.reset = info->reset; - fc->info.lookup = info->lookup; - fc->info.kpse_type = info->kpse_type; - listh_append(&font_classes[klass], LIST(fc)); - return 0; -} - -int mdvi_unregister_font_type(const char *name, int klass) -{ - DviFontClass *fc; - int k; - - if(klass == -1) - klass = MAX_CLASS - 1; - - if(klass >= 0 && klass < MAX_CLASS) { - k = klass; - LIST_FOREACH(fc, DviFontClass, &font_classes[k]) { - if(STREQ(fc->info.name, name)) - break; - } - } else if(klass < 0) { - for(k = 0; k < MAX_CLASS; k++) { - LIST_FOREACH(fc, DviFontClass, &font_classes[k]) { - if(STREQ(fc->info.name, name)) - break; - } - if(fc) break; - } - } else - return -1; - - if(fc == NULL || fc->links) - return -1; - /* remove it */ - listh_remove(&font_classes[k], LIST(fc)); - - /* and destroy it */ - mdvi_free(fc->info.name); - mdvi_free(fc); - return 0; -} - -static char *lookup_font(DviFontClass *ptr, const char *name, Ushort *h, Ushort *v) -{ - char *filename; - - /* - * If the font type registered a function to do the lookup, use that. - * Otherwise we use kpathsea. - */ - if(ptr->info.lookup) - filename = ptr->info.lookup(name, h, v); - else if(ptr->info.kpse_type <= kpse_any_glyph_format) { - kpse_glyph_file_type type; - - filename = kpse_find_glyph(name, Max(*h, *v), - ptr->info.kpse_type, &type); - /* if kpathsea returned a fallback font, reject it */ - if(filename && type.source == kpse_glyph_source_fallback) { - mdvi_free(filename); - filename = NULL; - } else if(filename) - *h = *v = type.dpi; - } else - filename = kpse_find_file(name, ptr->info.kpse_type, 1); - return filename; -} - -/* - * Class MAX_CLASS-1 is special: it consists of `metric' fonts that should - * be tried as a last resort - */ -char *mdvi_lookup_font(DviFontSearch *search) -{ - int kid; - int k; - DviFontClass *ptr; - DviFontClass *last; - char *filename = NULL; - const char *name; - Ushort hdpi, vdpi; - - if(search->id < 0) - return NULL; - - if(search->curr == NULL) { - /* this is the initial search */ - name = search->wanted_name; - hdpi = search->hdpi; - vdpi = search->vdpi; - kid = 0; - last = NULL; - } else { - name = search->actual_name; - hdpi = search->actual_hdpi; - vdpi = search->actual_vdpi; - kid = search->id; - last = search->curr; - } - - ptr = NULL; -again: - /* try all classes except MAX_CLASS-1 */ - for(k = kid; !filename && k < MAX_CLASS-1; k++) { - if(last == NULL) - ptr = (DviFontClass *)font_classes[k].head; - else - ptr = last->next; - while(ptr) { - DEBUG((DBG_FONTS, "%d: trying `%s' at (%d,%d)dpi as `%s'\n", - k, name, hdpi, vdpi, ptr->info.name)); - /* lookup the font in this class */ - filename = lookup_font(ptr, name, &hdpi, &vdpi); - if(filename) - break; - ptr = ptr->next; - } - last = NULL; - } - if(filename != NULL) { - search->id = k-1; - search->curr = ptr; - search->actual_name = name; - search->actual_hdpi = hdpi; - search->actual_vdpi = vdpi; - search->info = &ptr->info; - ptr->links++; - return filename; - } - - if(kid < MAX_CLASS - 1 && !STREQ(name, _mdvi_fallback_font)) { - warning("font `%s' at %dx%d not found, trying `%s' instead\n", - name, hdpi, vdpi, _mdvi_fallback_font); - name = _mdvi_fallback_font; - kid = 0; - goto again; - } - - /* we tried the fallback font, and all the `real' classes. Let's - * try the `metric' class now */ - name = search->wanted_name; - hdpi = search->hdpi; - vdpi = search->vdpi; - if(kid == MAX_CLASS-1) { - /* we were looking into this class from the beginning */ - if(last == NULL) { - /* no more fonts to try */ - return NULL; - } - ptr = last->next; - } else { - warning("font `%s' not found, trying metric files instead\n", - name); - ptr = (DviFontClass *)font_classes[MAX_CLASS-1].head; - } - -metrics: - while(ptr) { - DEBUG((DBG_FONTS, "metric: trying `%s' at (%d,%d)dpi as `%s'\n", - name, hdpi, vdpi, ptr->info.name)); - filename = lookup_font(ptr, name, &hdpi, &vdpi); - if(filename) - break; - ptr = ptr->next; - } - if(filename != NULL) { - if(STREQ(name, _mdvi_fallback_font)) - search->id = MAX_CLASS; - else - search->id = MAX_CLASS - 1; - search->curr = ptr; - search->actual_name = name; - search->actual_hdpi = hdpi; - search->actual_vdpi = vdpi; - search->info = &ptr->info; - ptr->links++; - return filename; - } - if(!STREQ(name, _mdvi_fallback_font)) { - warning("metric file for `%s' not found, trying `%s' instead\n", - name, _mdvi_fallback_font); - name = _mdvi_fallback_font; - ptr = (DviFontClass *)font_classes[MAX_CLASS-1].head; - goto metrics; - } - - search->id = -1; - search->actual_name = NULL; - - /* tough luck, nothing found */ - return NULL; -} - -/* called by `font_reference' to do the initial lookup */ -DviFont *mdvi_add_font(const char *name, Int32 sum, - int hdpi, int vdpi, Int32 scale) -{ - DviFont *font; - - font = xalloc(DviFont); - font->fontname = mdvi_strdup(name); - SEARCH_INIT(font->search, font->fontname, hdpi, vdpi); - font->filename = mdvi_lookup_font(&font->search); - if(font->filename == NULL) { - /* this answer is final */ - mdvi_free(font->fontname); - mdvi_free(font); - return NULL; - } - font->hdpi = font->search.actual_hdpi; - font->vdpi = font->search.actual_vdpi; - font->scale = scale; - font->design = 0; - font->checksum = sum; - font->type = 0; - font->links = 0; - font->loc = 0; - font->hic = 0; - font->in = NULL; - font->chars = NULL; - font->subfonts = NULL; - - return font; -} - -int mdvi_font_retry(DviParams *params, DviFont *font) -{ - /* try the search again */ - char *filename; - - ASSERT(font->search.curr != NULL); - /* we won't be using this class anymore */ - font->search.curr->links--; - - filename = mdvi_lookup_font(&font->search); - if(filename == NULL) - return -1; - mdvi_free(font->filename); - font->filename = filename; - /* copy the new information */ - font->hdpi = font->search.actual_hdpi; - font->vdpi = font->search.actual_vdpi; - - return 0; -} |