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pdf2htmlEX/pdf2htmlEX/src/util/ffw.c

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/*
* ffw.c: Fontforge wrapper
*
* Processing fonts using Fontforge
*
* Copyright (C) 2012-2014 Lu Wang <coolwanglu@gmail.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include <math.h>
#include <fontforge.h>
#include <baseviews.h>
#include "SignalHandler.h"
#include "ffw.h" // needed for:
#include "gfile.h" // FindProgDir
#include "fontforge/autowidth.h" // FVRemoveKerns
#include "fontforge/bitmapchar.h" // SFReplaceEncodingBDFProps
#include "fontforge/cvimages.h" // FVImportImages
#include "fontforge/encoding.h" // (helpful as we have a name conflict)
#include "fontforge/fvfonts.h" // SFFindSlot
#include "fontforge/namelist.h" // UniFromName
#include "fontforge/savefont.h" // GenerateScript
#include "fontforge/splineorder2.h" // SFConvertToOrder2
#include "fontforge/splineutil.h" // AltUniFree
#include "fontforge/splineutil2.h" // SplineFontNew
#include "fontforge/start.h" // InitSimpleStuff
#include "fontforge/tottf.h" // SFDefaultOS2Info
static real EPS=1e-6;
static inline int min(int a, int b)
{
return (a<b)?a:b;
}
static FontViewBase * cur_fv = NULL;
static Encoding * original_enc = NULL;
static Encoding * unicodefull_enc = NULL;
static Encoding * enc_head = NULL;
static void err(const char * format, ...)
{
va_list al;
va_start(al, format);
vfprintf(stderr, format, al);
va_end(al);
exit(-1);
}
static char * strcopy(const char * str)
{
if(str == NULL) return NULL;
char * blabla = strdup(str);
if(!blabla)
err("Not enough memory");
return blabla;
}
static void dumb_logwarning(const char * format, ...) { }
static void dumb_post_error(const char * title, const char * error, ...) { }
void ffw_init(const char* progPath, int debug)
{
ffwSetAction("initialize");
char *localProgPath = strdup(progPath);
FindProgDir(localProgPath);
InitSimpleStuff();
if ( default_encoding==NULL )
default_encoding=FindOrMakeEncoding("ISO8859-1");
if ( default_encoding==NULL )
default_encoding=&custom; /* In case iconv is broken */
if(!debug)
{
//disable error output of Fontforge
ui_interface->logwarning = &dumb_logwarning;
ui_interface->post_error = &dumb_post_error;
}
original_enc = FindOrMakeEncoding("original");
unicodefull_enc = FindOrMakeEncoding("UnicodeFull");
{
Val v;
v.type = v_int;
v.u.ival = 1;
SetPrefs("DetectDiagonalStems", &v, NULL);
}
ffwClearAction();
}
void ffw_finalize(void)
{
ffwSetAction("finalize");
while(enc_head)
{
Encoding * next = enc_head->next;
free((void*)enc_head->enc_name);
free(enc_head->unicode);
if(enc_head->psnames)
{
int i;
for(i = 0; i < enc_head->char_cnt; ++i)
free((void*)enc_head->psnames[i]);
free(enc_head->psnames);
}
free(enc_head);
enc_head = next;
}
ffwClearAction();
}
// see: https://stackoverflow.com/a/2653351
#define xstr(a) str(a)
#define str(a) #a
static FFWVersionInfo ffwVersionInfo;
const FFWVersionInfo* ffw_get_version_info(void)
{
ffwVersionInfo.versionDate = FONTFORGE_VERSION;
return &ffwVersionInfo;
}
void ffw_new_font()
{
ffwSetAction("create");
assert((cur_fv == NULL) && "Previous font is not destroyed");
cur_fv = FVAppend(_FontViewCreate(SplineFontNew()));
ffwClearAction();
}
void ffw_load_font(const char * filename)
{
ffwSetAction("load");
assert((cur_fv == NULL) && "Previous font is not destroyed");
char * _filename = strcopy(filename);
SplineFont * font = LoadSplineFont(_filename, of_fstypepermitted);
free(_filename);
if(!font)
err("Cannot load font %s\n", filename);
if(!font->fv) {
assert(fv_interface && "fv_interface not initialized!");
FVAppend(_FontViewCreate(font));
}
assert(font->fv);
cur_fv = font->fv;
// If we are a composite font, then ensure the cidmaster has the same ascent/descent values as the first subfont.
// If there are more than one subfont then what do we do???
if (cur_fv->cidmaster && (cur_fv->cidmaster->ascent != cur_fv->sf->ascent || cur_fv->cidmaster->descent != cur_fv->sf->descent)) {
printf("ffw_load_font:Warning ascent/descent mismatch for CID font: %d/%d => %d/%d\n",
cur_fv->cidmaster->ascent, cur_fv->cidmaster->descent, cur_fv->sf->ascent, cur_fv->sf->descent);
cur_fv->cidmaster->ascent = cur_fv->sf->ascent;
cur_fv->cidmaster->descent = cur_fv->sf->descent;
}
ffwClearAction();
}
//
// Fight again dirty stuffs
//
void ffw_prepare_font(void)
{
ffwSetAction("prepare");
memset(cur_fv->selected, 1, cur_fv->map->enccount);
// remove kern
FVRemoveKerns(cur_fv);
FVRemoveVKerns(cur_fv);
//
// Remove Alternate Unicodes
// We never use them because we will do a force encoding
//
int i;
SplineFont * sf = cur_fv->sf;
for(i = 0; i < sf->glyphcnt; ++i)
{
SplineChar * sc = sf->glyphs[i];
if(sc)
{
struct altuni * p = sc->altuni;
if(p)
{
AltUniFree(p);
sc->altuni = NULL;
}
}
}
//
// Wipe out font name
// browsers may rejects fonts with malformed font names
//
free(sf->fontname);
sf->fontname = strcopy("");
ffwClearAction();
}
void ffw_save(const char * filename)
{
ffwSetAction("save");
char * _filename = strcopy(filename);
char * _ = strcopy("");
int r = GenerateScript(cur_fv->sf, _filename
, _, -1, -1, NULL, NULL, cur_fv->map, NULL, ly_fore);
free(_);
free(_filename);
if(!r)
err("Cannot save font to %s\n", filename);
ffwClearAction();
}
void ffw_close(void)
{
ffwSetAction("close");
FontViewClose(cur_fv);
cur_fv = NULL;
ffwClearAction();
}
static void ffw_do_reencode(Encoding * encoding, int force)
{
assert(encoding);
if(force)
{
SFForceEncoding(cur_fv->sf, cur_fv->map, encoding);
}
else
{
EncMapFree(cur_fv->map);
cur_fv->map = EncMapFromEncoding(cur_fv->sf, encoding);
}
if(cur_fv->normal)
{
EncMapFree(cur_fv->normal);
cur_fv->normal = NULL;
}
SFReplaceEncodingBDFProps(cur_fv->sf, cur_fv->map);
free(cur_fv->selected);
cur_fv->selected = calloc(cur_fv->map->enccount, sizeof(char));
}
void ffw_reencode_glyph_order(void)
{
ffwSetAction("re-encode the glyph order in");
ffw_do_reencode(original_enc, 0);
ffwClearAction();
}
void ffw_reencode_unicode_full(void)
{
ffwSetAction("re-encode to unicode");
ffw_do_reencode(unicodefull_enc, 0);
ffwClearAction();
}
void ffw_reencode(const char * encname, int force)
{
ffwSetAction("re-encode");
Encoding * enc = FindOrMakeEncoding(encname);
if(!enc)
err("Unknown encoding %s\n", encname);
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_reencode_raw(int32_t * mapping, int mapping_len, int force)
{
ffwSetAction("re-encode (raw1)");
Encoding * enc = calloc(1, sizeof(Encoding));
enc->only_1byte = enc->has_1byte = true;
int len = (mapping_len < 256) ? 256 : mapping_len;
enc->char_cnt = len;
enc->unicode = (int32_t*)malloc(len * sizeof(int32_t));
memcpy(enc->unicode, mapping, mapping_len * sizeof(int32_t));
if(mapping_len < 256)
{
int i;
for(i = mapping_len; i < 256; ++i)
enc->unicode[i] = -1;
}
enc->enc_name = strcopy("");
enc->next = enc_head;
enc_head = enc;
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_reencode_raw2(const char ** mapping, int mapping_len, int force)
{
ffwSetAction("re-encode (raw2)");
Encoding * enc = calloc(1, sizeof(Encoding));
enc->enc_name = strcopy("");
enc->char_cnt = mapping_len;
enc->unicode = (int32_t*)malloc(mapping_len * sizeof(int32_t));
enc->psnames = (char**)calloc(mapping_len, sizeof(char*));
int i;
for(i = 0; i < mapping_len; ++i)
{
if(mapping[i])
{
enc->unicode[i] = UniFromName(mapping[i], ui_none, &custom);
enc->psnames[i] = strcopy(mapping[i]);
}
else
{
enc->unicode[i] = -1;
}
}
enc->next = enc_head;
enc_head = enc;
ffw_do_reencode(enc, force);
ffwClearAction();
}
void ffw_cidflatten(void)
{
if(!cur_fv->sf->cidmaster)
{
fprintf(stderr, "Cannot flatten a non-CID font\n");
return;
}
ffwSetAction("flatten the cid in");
SFFlatten(&(cur_fv->sf->cidmaster));
ffwClearAction();
}
//
// There is no check if a glyph with the same unicode exists!
// TODO: let FontForge fill in the standard glyph name <- or maybe this might cause collision?
//
void ffw_add_empty_char(int32_t unicode, int width)
{
ffwSetAction("add an empty character to");
SplineChar * sc = SFMakeChar(cur_fv->sf, cur_fv->map, cur_fv->map->enccount);
char buffer[400];
SCSetMetaData(sc,
strcopy(StdGlyphName(buffer, unicode,
cur_fv->sf->uni_interp, cur_fv->sf->for_new_glyphs)),
unicode, sc->comment);
SCSynchronizeWidth(sc, width, sc->width, cur_fv);
ffwClearAction();
}
int ffw_get_em_size(void)
{
ffwSetAction("get the em size of");
int emSize = cur_fv->sf->ascent + cur_fv->sf->descent;
ffwClearAction();
return emSize;
}
void ffw_fix_metric()
{
ffwSetAction("fix the metric of");
double ascent, descent;
ffw_get_metric(&ascent, &descent);
ffw_set_metric(ascent, descent);
ffwClearAction();
}
void ffw_get_metric(double * ascent, double * descent)
{
ffwSetAction("get the metric of");
SplineFont * sf = cur_fv->sf;
DBounds bb;
SplineFontFindBounds(sf, &bb);
int em = sf->ascent + sf->descent;
if (em > 0)
{
*ascent = ((double)bb.maxy) / em;
*descent = ((double)bb.miny) / em;
}
else
{
*ascent = *descent = 0;
}
ffwClearAction();
}
void ffw_set_metric(double ascent, double descent)
{
ffwSetAction("set the metric of");
SplineFont * sf = cur_fv->sf;
struct pfminfo * info = &sf->pfminfo;
SFDefaultOS2Info(info, sf, sf->fontname);
info->pfmset = 1;
sf->changed = 1;
int em = sf->ascent + sf->descent;
int a = floor(ascent * em + 0.5);
int d = floor(descent * em + 0.5);
if(a < 0) a = 0;
if(d > 0) d = 0;
//
//sf->ascent = min(a, em);
//sf->descent = em - bb.maxy;
//
//
// The embedded fonts are likely to have inconsistent values for the 3 sets of ascent/descent
// PDF viewers don't care, since they don't even use these values
// But have to unify them, for different browsers on different platforms
// Things may become easier when there are CSS rules for baseline-based positioning.
//
info->os2_winascent = a;
info->os2_typoascent = a;
info->hhead_ascent = a;
info->winascent_add = 0;
info->typoascent_add = 0;
info->hheadascent_add = 0;
info->os2_windescent = -d;
info->os2_typodescent = d;
info->hhead_descent = d;
info->windescent_add = 0;
info->typodescent_add = 0;
info->hheaddescent_add = 0;
info->os2_typolinegap = 0;
info->linegap = 0;
ffwClearAction();
}
//
// TODO:bitmap, reference have not been considered in this function
//
void ffw_set_widths(int * width_list, int mapping_len,
int stretch_narrow, int squeeze_wide)
{
ffwSetAction("set the widths of");
SplineFont * sf = cur_fv->sf;
if(sf->onlybitmaps
&& cur_fv->active_bitmap != NULL
&& sf->bitmaps != NULL)
{
printf("TODO: width vs bitmap\n");
}
EncMap * map = cur_fv->map;
int i;
int imax = min(mapping_len, map->enccount);
for(i = 0; i < imax; ++i)
{
//
// Don't mess with it if the glyphs is not used.
//
if(width_list[i] == -1)
{
continue;
}
int j = map->map[i];
if(j == -1) continue;
SplineChar * sc = sf->glyphs[j];
if(sc == NULL)
{
sc = SFMakeChar(cur_fv->sf, cur_fv->map, j);
}
else if(((sc->width > EPS)
&& (((sc->width > width_list[i] + EPS) && (squeeze_wide))
|| ((sc->width < width_list[i] - EPS) && (stretch_narrow)))))
{
real transform[6];
transform[0] = ((double)width_list[i]) / (sc->width);
transform[3] = 1.0;
transform[1] = transform[2] = transform[4] = transform[5] = 0;
FVTrans(cur_fv, sc, transform, NULL, fvt_alllayers | fvt_dontmovewidth);
}
SCSynchronizeWidth(sc, width_list[i], sc->width, cur_fv);
}
ffwClearAction();
}
void ffw_import_svg_glyph(int code, const char * filename, double ox, double oy, double width)
{
ffwSetAction("import the glyphs from");
int enc = SFFindSlot(cur_fv->sf, cur_fv->map, code, "");
if(enc == -1) {
ffwClearAction();
return;
}
SplineChar * sc = SFMakeChar(cur_fv->sf, cur_fv->map, enc);
memset(cur_fv->selected, 0, cur_fv->map->enccount);
cur_fv->selected[enc] = 1;
ImportParams ip;
InitImportParams(&ip);
int ok = FVImportImages(
cur_fv,
(char*)filename,
fv_svg,
0 /*toback*/,
true /*preclear*/,
&ip
);
if(!ok)
err("Import SVG glyph failed");
// correct origin and width
{
int a = cur_fv->sf->ascent;
int d = cur_fv->sf->descent;
real transform[6];
transform[0] = 1.0;
transform[3] = 1.0;
transform[1] = transform[2] = 0.0;
transform[4] = -ox * (a+d);
transform[5] = -oy * (a+d) + d;
FVTrans(cur_fv, sc, transform, NULL, fvt_alllayers | fvt_dontmovewidth);
SCSynchronizeWidth(sc, floor(width * (a+d) + 0.5), sc->width, cur_fv);
}
ffwClearAction();
}
void ffw_auto_hint(void)
{
ffwSetAction("automatically hint");
// convert to quadratic
if(!(cur_fv->sf->layers[ly_fore].order2))
{
SFCloseAllInstrs(cur_fv->sf);
SFConvertToOrder2(cur_fv->sf);
}
memset(cur_fv->selected, 1, cur_fv->map->enccount);
FVAutoHint(cur_fv);
FVAutoInstr(cur_fv);
ffwClearAction();
}
void ffw_override_fstype(void)
{
ffwSetAction("override the fstype of");
*(int16_t *)(&cur_fv->sf->pfminfo.fstype) = 0;
cur_fv->sf->pfminfo.pfmset = true;
cur_fv->sf->changed = true;
ffwClearAction();
}
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