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https://github.com/pdf2htmlEX/pdf2htmlEX.git
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403 lines
9.0 KiB
C
403 lines
9.0 KiB
C
/*
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* ffw.c: Fontforge wrapper
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*
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* Processing fonts using Fontforge
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*
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* by WangLu
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* 2012.09.03
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <math.h>
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#include <fontforge.h>
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#include <baseviews.h>
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#include "ffw.h"
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static real EPS=1e-6;
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static inline int min(int a, int b)
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{
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return (a<b)?a:b;
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}
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static FontViewBase * cur_fv = NULL;
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static Encoding * original_enc = NULL;
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static Encoding * enc_head = NULL;
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static void err(const char * format, ...)
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{
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va_list al;
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va_start(al, format);
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vfprintf(stderr, format, al);
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va_end(al);
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exit(-1);
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}
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static char * strcopy(const char * str)
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{
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if(str == NULL) return NULL;
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char * _ = strdup(str);
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if(!_)
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err("Not enough memory");
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return _;
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}
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static void dumb_logwarning(const char * format, ...) { }
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static void dumb_post_error(const char * title, const char * error, ...) { }
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void ffw_init(int debug)
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{
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InitSimpleStuff();
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if ( default_encoding==NULL )
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default_encoding=FindOrMakeEncoding("ISO8859-1");
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if ( default_encoding==NULL )
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default_encoding=&custom; /* In case iconv is broken */
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if(!debug)
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{
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//disable error output of Fontforge
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ui_interface->logwarning = &dumb_logwarning;
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ui_interface->post_error = &dumb_post_error;
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}
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original_enc = FindOrMakeEncoding("original");
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{
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Val v;
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v.type = v_int;
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v.u.ival = 1;
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SetPrefs("DetectDiagonalStems", &v, NULL);
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}
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}
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void ffw_finalize(void)
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{
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while(enc_head)
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{
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Encoding * next = enc_head->next;
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free(enc_head->enc_name);
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free(enc_head->unicode);
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if(enc_head->psnames)
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{
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int i;
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for(i = 0; i < enc_head->char_cnt; ++i)
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free(enc_head->psnames[i]);
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free(enc_head->psnames);
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}
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free(enc_head);
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enc_head = next;
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}
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}
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void ffw_load_font(const char * filename)
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{
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assert((cur_fv == NULL) && "Previous font is not destroyed");
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char * _filename = strcopy(filename);
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SplineFont * font = LoadSplineFont(_filename, 1);
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free(_filename);
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if(!font)
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err("Cannot load font %s\n", filename);
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if(!font->fv)
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FVAppend(_FontViewCreate(font));
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assert(font->fv);
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cur_fv = font->fv;
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}
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/*
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* Fight again dirty stuffs
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*/
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void ffw_prepare_font(void)
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{
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memset(cur_fv->selected, 1, cur_fv->map->enccount);
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// remove kern
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FVRemoveKerns(cur_fv);
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FVRemoveVKerns(cur_fv);
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/*
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* Remove Alternate Unicodes
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* We never use them because we will do a force encoding
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*/
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int i;
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SplineFont * sf = cur_fv->sf;
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for(i = 0; i < sf->glyphcnt; ++i)
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{
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SplineChar * sc = sf->glyphs[i];
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if(sc)
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{
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struct altuni * p = sc->altuni;
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if(p)
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{
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AltUniFree(p);
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sc->altuni = NULL;
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}
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}
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}
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}
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void ffw_save(const char * filename)
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{
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char * _filename = strcopy(filename);
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char * _ = strcopy("");
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int r = GenerateScript(cur_fv->sf, _filename
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, _, -1, -1, NULL, NULL, cur_fv->map, NULL, ly_fore);
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free(_);
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free(_filename);
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if(!r)
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err("Cannot save font to %s\n", filename);
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}
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void ffw_close(void)
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{
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FontViewClose(cur_fv);
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cur_fv = NULL;
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}
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static void ffw_do_reencode(Encoding * encoding, int force)
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{
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assert(encoding);
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if(force)
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{
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SFForceEncoding(cur_fv->sf, cur_fv->map, encoding);
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}
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else
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{
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EncMapFree(cur_fv->map);
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cur_fv->map = EncMapFromEncoding(cur_fv->sf, encoding);
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}
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if(cur_fv->normal)
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{
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EncMapFree(cur_fv->normal);
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cur_fv->normal = NULL;
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}
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SFReplaceEncodingBDFProps(cur_fv->sf, cur_fv->map);
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free(cur_fv->selected);
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cur_fv->selected = gcalloc(cur_fv->map->enccount, sizeof(char));
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}
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void ffw_reencode_glyph_order(void)
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{
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ffw_do_reencode(original_enc, 0);
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}
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void ffw_reencode(const char * encname, int force)
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{
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Encoding * enc = FindOrMakeEncoding(encname);
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if(!enc)
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err("Unknown encoding %s\n", encname);
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ffw_do_reencode(enc, force);
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}
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void ffw_reencode_raw(int32 * mapping, int mapping_len, int force)
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{
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Encoding * enc = calloc(1, sizeof(Encoding));
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enc->only_1byte = enc->has_1byte = true;
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enc->char_cnt = mapping_len;
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enc->unicode = (int32_t*)malloc(mapping_len * sizeof(int32_t));
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memcpy(enc->unicode, mapping, mapping_len * sizeof(int32_t));
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enc->enc_name = strcopy("");
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enc->next = enc_head;
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enc_head = enc;
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ffw_do_reencode(enc, force);
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}
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void ffw_reencode_raw2(char ** mapping, int mapping_len, int force)
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{
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Encoding * enc = calloc(1, sizeof(Encoding));
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enc->enc_name = strcopy("");
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enc->char_cnt = mapping_len;
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enc->unicode = (int32_t*)malloc(mapping_len * sizeof(int32_t));
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enc->psnames = (char**)calloc(mapping_len, sizeof(char*));
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int i;
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for(i = 0; i < mapping_len; ++i)
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{
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if(mapping[i])
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{
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enc->unicode[i] = UniFromName(mapping[i], ui_none, &custom);
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enc->psnames[i] = strcopy(mapping[i]);
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}
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else
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{
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enc->unicode[i] = -1;
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}
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}
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enc->next = enc_head;
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enc_head = enc;
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ffw_do_reencode(enc, force);
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}
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void ffw_cidflatten(void)
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{
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if(!cur_fv->sf->cidmaster)
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err("Cannot flatten a non-CID font");
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SFFlatten(cur_fv->sf->cidmaster);
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}
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void ffw_make_char(int enc, int width)
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{
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SFMakeChar(cur_fv->sf, cur_fv->map, enc)->width = width;
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}
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int ffw_get_em_size(void)
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{
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return cur_fv->sf->ascent + cur_fv->sf->descent;
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}
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void ffw_metric(double * ascent, double * descent)
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{
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SplineFont * sf = cur_fv->sf;
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struct pfminfo * info = &sf->pfminfo;
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SFDefaultOS2Info(info, sf, sf->fontname);
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info->pfmset = 1;
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sf->changed = 1;
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DBounds bb;
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SplineFontFindBounds(sf, &bb);
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/*
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printf("bb %lf %lf\n", bb.maxy, bb.miny);
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printf("_ %d %d\n", sf->ascent, sf->descent);
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printf("win %d %d\n", info->os2_winascent, info->os2_windescent);
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printf("%d %d\n", info->winascent_add, info->windescent_add);
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printf("typo %d %d\n", info->os2_typoascent, info->os2_typodescent);
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printf("%d %d\n", info->typoascent_add, info->typodescent_add);
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printf("hhead %d %d\n", info->hhead_ascent, info->hhead_descent);
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printf("%d %d\n", info->hheadascent_add, info->hheaddescent_add);
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*/
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int em = sf->ascent + sf->descent;
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if (em > 0)
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{
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*ascent = ((double)bb.maxy) / em;
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*descent = ((double)bb.miny) / em;
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}
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else
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{
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*ascent = *descent = 0;
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}
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int a = floor(bb.maxy + 0.5);
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int d = floor(bb.miny + 0.5);
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if(a < 0) a = 0;
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if(d > 0) d = 0;
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/*
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sf->ascent = min(a, em);
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sf->descent = em - bb.maxy;
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*/
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info->os2_winascent = a;
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info->os2_typoascent = a;
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info->hhead_ascent = a;
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info->winascent_add = 0;
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info->typoascent_add = 0;
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info->hheadascent_add = 0;
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info->os2_windescent = -d;
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info->os2_typodescent = d;
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info->hhead_descent = d;
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info->windescent_add = 0;
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info->typodescent_add = 0;
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info->hheaddescent_add = 0;
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info->os2_typolinegap = 0;
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info->linegap = 0;
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}
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/*
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* TODO:bitmap, reference have not been considered in this function
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* TODO:remove_unused may not be suitable to be done here
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*/
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void ffw_set_widths(int * width_list, int mapping_len,
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int stretch_narrow, int squeeze_wide,
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int remove_unused)
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{
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SplineFont * sf = cur_fv->sf;
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if(sf->onlybitmaps
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&& cur_fv->active_bitmap != NULL
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&& sf->bitmaps != NULL)
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{
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printf("TODO: width vs bitmap\n");
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}
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memset(cur_fv->selected, 0, cur_fv->map->enccount);
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EncMap * map = cur_fv->map;
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int i;
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int imax = min(mapping_len, map->enccount);
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for(i = 0; i < imax; ++i)
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{
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/*
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* Do mess with it if the glyphs is not used.
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*/
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if(width_list[i] == -1)
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{
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cur_fv->selected[i] = 1;
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continue;
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}
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int j = map->map[i];
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if(j == -1) continue;
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SplineChar * sc = sf->glyphs[j];
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if(sc == NULL) continue;
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if(((sc->width > EPS)
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&& (((sc->width > width_list[i] + EPS) && (squeeze_wide))
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|| ((sc->width < width_list[i] - EPS) && (stretch_narrow)))))
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{
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real transform[6]; transform[0] = ((double)width_list[i]) / (sc->width);
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transform[3] = 1.0;
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transform[1] = transform[2] = transform[4] = transform[5] = 0;
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FVTrans(cur_fv, sc, transform, NULL, fvt_alllayers | fvt_dontmovewidth);
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}
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sc->width = width_list[i];
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}
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for(; i < map->enccount; ++i)
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cur_fv->selected[i] = 1;
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if(remove_unused)
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FVDetachAndRemoveGlyphs(cur_fv);
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}
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void ffw_auto_hint(void)
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{
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// convert to quadratic
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if(!(cur_fv->sf->layers[ly_fore].order2))
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{
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SFCloseAllInstrs(cur_fv->sf);
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SFConvertToOrder2(cur_fv->sf);
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}
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memset(cur_fv->selected, 1, cur_fv->map->enccount);
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FVAutoHint(cur_fv);
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FVAutoInstr(cur_fv);
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}
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