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/* vf.c */
/************************************************************************
Part of the dvipng distribution
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>.
Copyright (C) 2002-2015 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
#define VF_ID 202
#define LONG_CHAR 242
int32_t SetVF(struct char_entry* ptr)
{
struct font_entry* currentvf;
unsigned char *command,*end;
currentvf=currentfont;
BeginVFMacro(currentvf);
command = ptr->data;
end = command + ptr->length;
while (command < end) {
DEBUG_PRINT(DEBUG_DVI,("\n VF MACRO:\t%s ", dvi_commands[*command]));
DrawCommand(command,currentvf);
command += CommandLength(command);
}
EndVFMacro();
currentfont=currentvf;
return(ptr->tfmw);
}
void InitVF(struct font_entry * tfontp)
{
unsigned char* position;
int length;
struct char_entry *tcharptr;
uint32_t c=0;
struct font_num *tfontnump; /* temporary font_num pointer */
DEBUG_PRINT((DEBUG_DVI|DEBUG_VF),("\n OPEN FONT:\t'%s'", tfontp->name));
Message(BE_VERBOSE,"<%s>", tfontp->name);
if (MmapFile(tfontp->name,&(tfontp->fmmap)))
Fatal("font file %s unusable", tfontp->name);
position=(unsigned char*)tfontp->fmmap.data;
if (*(position) != PRE)
Fatal("unknown font format in file %s",tfontp->name);
if (*(position+1) != VF_ID)
Fatal( "wrong version %d of vf file %s (should be 202)",
(int)*(position+1),tfontp->name);
DEBUG_PRINT(DEBUG_VF,("\n VF_PRE:\t'%.*s'",
(int)*(position+2), position+3));
position = position+3 + *(position+2);
c=UNumRead(position, 4);
DEBUG_PRINT(DEBUG_VF,(" %d", c));
CheckChecksum (tfontp->c, c, tfontp->name);
tfontp->designsize = UNumRead(position+4,4);
DEBUG_PRINT(DEBUG_VF,(" %d", tfontp->designsize));
tfontp->type = FONT_TYPE_VF;
tfontp->vffontnump=NULL;
/* Read font definitions */
position += 8;
while(*position >= FNT_DEF1 && *position <= FNT_DEF4) {
DEBUG_PRINT(DEBUG_VF,("\n @%ld VF:\t%s",
(long)((char *)position - tfontp->fmmap.data),
dvi_commands[*position]));
FontDef(position,tfontp);
length = dvi_commandlength[*position];
position += length + *(position + length-1) + *(position+length-2);
}
/* Default font is the first defined */
tfontnump = tfontp->vffontnump;
while (tfontnump->next != NULL) {
tfontnump = tfontnump->next;
}
tfontp->defaultfont=tfontnump->k;
/* Read char definitions */
while(*position < FNT_DEF1) {
DEBUG_PRINT(DEBUG_VF,("\n@%ld VF CHAR:\t",
(long)((char *)position - tfontp->fmmap.data)));
if ((tcharptr=malloc(sizeof(struct char_entry)))==NULL)
Fatal("cannot allocate memory for VF char entry");
switch (*position) {
case LONG_CHAR:
tcharptr->length = UNumRead(position+1,4);
c = UNumRead(position+5,4);
tcharptr->tfmw = UNumRead(position+9,4);
position += 13;
break;
default:
tcharptr->length = UNumRead(position,1);
c = UNumRead(position+1,1);
tcharptr->tfmw = UNumRead(position+2,3);
position += 5;
}
DEBUG_PRINT(DEBUG_VF,("%d %d %d",tcharptr->length,c,tcharptr->tfmw));
tcharptr->tfmw = (int32_t)
((int64_t) tcharptr->tfmw * tfontp->s / (1 << 20));
DEBUG_PRINT(DEBUG_VF,(" (%d)",tcharptr->tfmw));
if (c >= NFNTCHARS) /* Only positive for now */
Fatal("VF font %s exceeds char numbering limit",tfontp->name);
tfontp->chr[c] = tcharptr;
tcharptr->data=position;
position += tcharptr->length;
}
}
void DoneVF(struct font_entry *tfontp)
{
int c=FIRSTFNTCHAR;
UnMmapFile(&(tfontp->fmmap));
while(c<=LASTFNTCHAR) {
if (tfontp->chr[c]!=NULL) {
free(tfontp->chr[c]);
tfontp->chr[c]=NULL;
}
c++;
}
FreeFontNumP(tfontp->vffontnump);
tfontp->vffontnump=NULL;
if (tfontp->name!=NULL)
free(tfontp->name);
tfontp->name=NULL;
}
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