ref: 9eeea990cc54128afcbad46058e8f925f9436fab
dir: /src/cff/t2objs.c/
/***************************************************************************/
/* */
/* t2objs.c */
/* */
/* OpenType objects manager (body). */
/* */
/* Copyright 1996-2000 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/ftstream.h>
#include <freetype/fterrors.h>
#include <freetype/ttnameid.h>
#include <freetype/tttags.h>
#include <freetype/internal/sfnt.h>
#include <freetype/internal/psnames.h>
#ifdef FT_FLAT_COMPILE
#include "t2objs.h"
#include "t2load.h"
#else
#include <cff/t2objs.h>
#include <cff/t2load.h>
#endif
#include <freetype/internal/t2errors.h>
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_t2objs
/*************************************************************************/
/* */
/* FACE FUNCTIONS */
/* */
/*************************************************************************/
static
FT_String* T2_StrCopy( FT_Memory memory, const FT_String* source )
{
FT_Error error;
FT_String* result = 0;
FT_Int len = (FT_Int)strlen(source);
if ( !ALLOC( result, len+1 ) )
{
MEM_Copy( result, source, len );
result[len] = 0;
}
return result;
}
/* this function is used to build a Unicode charmap from the glyph names */
/* in a file.. */
static
FT_Error CFF_Build_Unicode_Charmap( T2_Face face,
FT_ULong base_offset,
PSNames_Interface* psnames )
{
CFF_Font* font = (CFF_Font*)face->extra.data;
FT_Memory memory = FT_FACE_MEMORY(face);
FT_UInt n, num_glyphs = face->root.num_glyphs;
const char** glyph_names;
FT_Error error;
CFF_Font_Dict* dict = &font->top_font.font_dict;
FT_ULong charset_offset;
FT_Byte format;
FT_Stream stream = face->root.stream;
charset_offset = dict->charset_offset;
if (!charset_offset)
{
FT_ERROR(( "CFF.Build_Unicode_Charmap: charset table is missing\n" ));
error = FT_Err_Invalid_File_Format;
goto Exit;
}
/* seek to charset table and allocate glyph names table */
if ( FILE_Seek( base_offset + charset_offset ) ||
ALLOC_ARRAY( glyph_names, num_glyphs, const char* ) )
goto Exit;
/* now, read each glyph name and store it in the glyph name table */
if ( READ_Byte(format) )
goto Fail;
switch (format)
{
case 0: /* format 0 - one SID per glyph */
{
const char** gname = glyph_names;
const char** limit = gname + num_glyphs;
if ( ACCESS_Frame( num_glyphs*2 ) )
goto Fail;
for ( ; gname < limit; gname++ )
gname[0] = T2_Get_String( &font->string_index,
GET_UShort(),
psnames );
FORGET_Frame();
break;
}
case 1: /* format 1 - sequential ranges */
case 2: /* format 2 - sequential ranges with 16-bit counts */
{
const char** gname = glyph_names;
const char** limit = gname + num_glyphs;
FT_UInt len = 3;
if (format == 2)
len++;
while (gname < limit)
{
FT_UInt first;
FT_UInt count;
if ( ACCESS_Frame( len ) )
goto Fail;
first = GET_UShort();
if (format == 3)
count = GET_UShort();
else
count = GET_Byte();
FORGET_Frame();
for ( ; count > 0; count-- )
{
gname[0] = T2_Get_String( &font->string_index,
first,
psnames );
gname++;
first++;
}
}
break;
}
default: /* unknown charset format !! */
FT_ERROR(( "CFF: unknown charset format !!\n" ));
error = FT_Err_Invalid_File_Format;
goto Fail;
}
/* all right, the glyph names were loaded, we now need to create */
/* the corresponding unicode charmap.. */
Fail:
for ( n = 0; n < num_glyphs; n++ )
FREE( glyph_names[n] );
FREE( glyph_names );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* T2_Init_Face */
/* */
/* <Description> */
/* Initializes a given OpenType face object. */
/* */
/* <Input> */
/* stream :: The source font stream. */
/* */
/* face_index :: The index of the font face in the resource. */
/* */
/* num_params :: Number of additional generic parameters. Ignored. */
/* */
/* params :: Additional generic parameters. Ignored. */
/* */
/* <InOut> */
/* face :: The newly built face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
LOCAL_DEF
FT_Error T2_Init_Face( FT_Stream stream,
T2_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error;
SFNT_Interface* sfnt;
PSNames_Interface* psnames;
FT_Bool pure_cff = 1;
FT_Bool sfnt_format = 0;
sfnt = (SFNT_Interface*)FT_Get_Module_Interface(
face->root.driver->root.library, "sfnt" );
if ( !sfnt )
goto Bad_Format;
psnames = (PSNames_Interface*)FT_Get_Module_Interface(
face->root.driver->root.library, "psnames" );
/* create input stream from resource */
if ( FILE_Seek( 0 ) )
goto Exit;
/* check that we have a valid OpenType file */
error = sfnt->init_face( stream, face, face_index, num_params, params );
if ( !error )
{
if ( face->format_tag != 0x4F54544FL ) /* `OTTO'; OpenType/CFF font */
{
FT_TRACE2(( "[not a valid OpenType/CFF font]\n" ));
goto Bad_Format;
}
/* If we are performing a simple font format check, exit immediately */
if ( face_index < 0 )
return T2_Err_Ok;
sfnt_format = 1;
/* now, the font can be either an OpenType/CFF font, or a SVG CEF font */
/* in the later case, it doesn't have a "head" table.. */
error = face->goto_table( face, TTAG_head, stream, 0 );
if (!error)
{
pure_cff = 0;
/* Load font directory */
error = sfnt->load_face( stream, face, face_index, num_params, params );
if ( error )
goto Exit;
}
else
{
/* load the "cmap" table by hand */
error = sfnt->load_charmaps( face, stream );
if (error)
goto Exit;
/* XXX: for now, we don't load the GPOS table, as OpenType Layout */
/* support will be added later to FreeType 2 as a separate module */
}
/* now, load the CFF part of the file */
error = face->goto_table( face, TTAG_CFF, stream, 0 );
if ( error )
goto Exit;
}
else
{
/* rewind to start of file, we're going to load a pure-CFF font */
(void)FILE_Seek(0);
error = FT_Err_Ok;
}
/* now load and parse the CFF table in the file */
{
CFF_Font* cff;
FT_Memory memory = face->root.memory;
FT_Face root;
FT_UInt flags;
if ( ALLOC( cff, sizeof ( *cff ) ) )
goto Exit;
face->extra.data = cff;
error = T2_Load_CFF_Font( stream, face_index, cff );
if ( error )
goto Exit;
/* Complement the root flags with some interesting information. */
/* Note that this is only necessary for pure CFF and CEF fonts */
root = &face->root;
if (pure_cff)
{
CFF_Font_Dict* dict = &cff->top_font.font_dict;
/* we need the psnames module for pure-CFF and CEF formats */
if (!psnames)
{
FT_ERROR(( "cannot open CFF & CEF fonts without the 'psnames' module\n" ));
goto Bad_Format;
}
/* compute number of glyphs */
if (dict->cid_registry)
root->num_glyphs = dict->cid_count;
else
root->num_glyphs = cff->charstrings_index.count;
/* set global bbox, as well as EM size */
root->units_per_EM = FT_DivFix( 1000L << 16, dict->font_matrix.yy ) >> 16;
root->bbox = dict->font_bbox;
root->ascender = root->bbox.yMax;
root->descender = root->bbox.yMin;
/* retrieve font family & style name */
root->family_name = T2_Get_Name( &cff->name_index, face_index );
if (dict->cid_registry)
{
root->style_name = T2_StrCopy( memory, "Regular" ); /* XXXX */
}
else
{
root->style_name = T2_Get_String( &cff->string_index,
dict->weight,
psnames );
}
/*********************************************************************/
/* */
/* Compute face flags. */
/* */
flags = FT_FACE_FLAG_SCALABLE | /* scalable outlines */
FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
if (sfnt_format)
flags |= FT_FACE_FLAG_SFNT;
/* fixed width font? */
if ( dict->is_fixed_pitch )
flags |= FT_FACE_FLAG_FIXED_WIDTH;
/* XXXX: WE DO NOT SUPPORT KERNING METRICS IN THE GPOS TABLE FOR NOW */
#if 0
/* kerning available ? */
if ( face->kern_pairs )
flags |= FT_FACE_FLAG_KERNING;
#endif
root->face_flags = flags;
/*********************************************************************/
/* */
/* Compute style flags. */
/* */
flags = 0;
if ( dict->italic_angle )
flags |= FT_STYLE_FLAG_ITALIC;
/* XXXX : may not be correct .. */
if ( cff->top_font.private_dict.force_bold )
flags |= FT_STYLE_FLAG_BOLD;
root->style_flags = flags;
}
}
Exit:
return error;
Bad_Format:
error = FT_Err_Unknown_File_Format;
goto Exit;
}
/*************************************************************************/
/* */
/* <Function> */
/* T2_Done_Face */
/* */
/* <Description> */
/* Finalizes a given face object. */
/* */
/* <Input> */
/* face :: A pointer to the face object to destroy. */
/* */
LOCAL_DEF
void T2_Done_Face( T2_Face face )
{
FT_Memory memory = face->root.memory;
SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
if ( sfnt )
sfnt->done_face( face );
{
CFF_Font* cff = (CFF_Font*)face->extra.data;
if ( cff )
{
T2_Done_CFF_Font( cff );
FREE( face->extra.data );
}
}
}
/*************************************************************************/
/* */
/* <Function> */
/* T2_Init_Driver */
/* */
/* <Description> */
/* Initializes a given OpenType driver object. */
/* */
/* <Input> */
/* driver :: A handle to the target driver object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
LOCAL_FUNC
FT_Error T2_Init_Driver( T2_Driver driver )
{
/* init extension registry if needed */
#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
return TT_Init_Extensions( driver );
#else
FT_UNUSED( driver );
return T2_Err_Ok;
#endif
}
/*************************************************************************/
/* */
/* <Function> */
/* T2_Done_Driver */
/* */
/* <Description> */
/* Finalizes a given OpenType driver. */
/* */
/* <Input> */
/* driver :: A handle to the target OpenType driver. */
/* */
LOCAL_FUNC
void T2_Done_Driver( T2_Driver driver )
{
/* destroy extensions registry if needed */
#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
TT_Done_Extensions( driver );
#else
FT_UNUSED( driver );
#endif
}
/* END */