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flutter / third_party / freetype2 / 5e9caaee7885cbc82f9f821bbec7f6c86f25b33a / . / src / winfonts / winfnt.c
blob: 6005e4c5c1a22f53fa63e0f9aa25aacc43e3c8ec [file] [log] [blame]
/****************************************************************************
*
* winfnt.c
*
* FreeType font driver for Windows FNT/FON files
*
* Copyright (C) 1996-2022 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
* Copyright 2003 Huw D M Davies for Codeweavers
* Copyright 2007 Dmitry Timoshkov for Codeweavers
*
* 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/ftwinfnt.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/ttnameid.h>
#include "winfnt.h"
#include "fnterrs.h"
#include <freetype/internal/services/svwinfnt.h>
#include <freetype/internal/services/svfntfmt.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 winfnt
static const FT_Frame_Field winmz_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinMZ_HeaderRec
FT_FRAME_START( 64 ),
FT_FRAME_USHORT_LE ( magic ),
FT_FRAME_SKIP_BYTES( 29 * 2 ),
FT_FRAME_ULONG_LE ( lfanew ),
FT_FRAME_END
};
static const FT_Frame_Field winne_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinNE_HeaderRec
FT_FRAME_START( 40 ),
FT_FRAME_USHORT_LE ( magic ),
FT_FRAME_SKIP_BYTES( 34 ),
FT_FRAME_USHORT_LE ( resource_tab_offset ),
FT_FRAME_USHORT_LE ( rname_tab_offset ),
FT_FRAME_END
};
static const FT_Frame_Field winpe32_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinPE32_HeaderRec
FT_FRAME_START( 248 ),
FT_FRAME_ULONG_LE ( magic ), /* PE00 */
FT_FRAME_USHORT_LE ( machine ), /* 0x014C - i386 */
FT_FRAME_USHORT_LE ( number_of_sections ),
FT_FRAME_SKIP_BYTES( 12 ),
FT_FRAME_USHORT_LE ( size_of_optional_header ),
FT_FRAME_SKIP_BYTES( 2 ),
FT_FRAME_USHORT_LE ( magic32 ), /* 0x10B */
FT_FRAME_SKIP_BYTES( 110 ),
FT_FRAME_ULONG_LE ( rsrc_virtual_address ),
FT_FRAME_ULONG_LE ( rsrc_size ),
FT_FRAME_SKIP_BYTES( 104 ),
FT_FRAME_END
};
static const FT_Frame_Field winpe32_section_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinPE32_SectionRec
FT_FRAME_START( 40 ),
FT_FRAME_BYTES ( name, 8 ),
FT_FRAME_SKIP_BYTES( 4 ),
FT_FRAME_ULONG_LE ( virtual_address ),
FT_FRAME_ULONG_LE ( size_of_raw_data ),
FT_FRAME_ULONG_LE ( pointer_to_raw_data ),
FT_FRAME_SKIP_BYTES( 16 ),
FT_FRAME_END
};
static const FT_Frame_Field winpe_rsrc_dir_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinPE_RsrcDirRec
FT_FRAME_START( 16 ),
FT_FRAME_ULONG_LE ( characteristics ),
FT_FRAME_ULONG_LE ( time_date_stamp ),
FT_FRAME_USHORT_LE( major_version ),
FT_FRAME_USHORT_LE( minor_version ),
FT_FRAME_USHORT_LE( number_of_named_entries ),
FT_FRAME_USHORT_LE( number_of_id_entries ),
FT_FRAME_END
};
static const FT_Frame_Field winpe_rsrc_dir_entry_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinPE_RsrcDirEntryRec
FT_FRAME_START( 8 ),
FT_FRAME_ULONG_LE( name ),
FT_FRAME_ULONG_LE( offset ),
FT_FRAME_END
};
static const FT_Frame_Field winpe_rsrc_data_entry_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WinPE_RsrcDataEntryRec
FT_FRAME_START( 16 ),
FT_FRAME_ULONG_LE( offset_to_data ),
FT_FRAME_ULONG_LE( size ),
FT_FRAME_ULONG_LE( code_page ),
FT_FRAME_ULONG_LE( reserved ),
FT_FRAME_END
};
static const FT_Frame_Field winfnt_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE FT_WinFNT_HeaderRec
FT_FRAME_START( 148 ),
FT_FRAME_USHORT_LE( version ),
FT_FRAME_ULONG_LE ( file_size ),
FT_FRAME_BYTES ( copyright, 60 ),
FT_FRAME_USHORT_LE( file_type ),
FT_FRAME_USHORT_LE( nominal_point_size ),
FT_FRAME_USHORT_LE( vertical_resolution ),
FT_FRAME_USHORT_LE( horizontal_resolution ),
FT_FRAME_USHORT_LE( ascent ),
FT_FRAME_USHORT_LE( internal_leading ),
FT_FRAME_USHORT_LE( external_leading ),
FT_FRAME_BYTE ( italic ),
FT_FRAME_BYTE ( underline ),
FT_FRAME_BYTE ( strike_out ),
FT_FRAME_USHORT_LE( weight ),
FT_FRAME_BYTE ( charset ),
FT_FRAME_USHORT_LE( pixel_width ),
FT_FRAME_USHORT_LE( pixel_height ),
FT_FRAME_BYTE ( pitch_and_family ),
FT_FRAME_USHORT_LE( avg_width ),
FT_FRAME_USHORT_LE( max_width ),
FT_FRAME_BYTE ( first_char ),
FT_FRAME_BYTE ( last_char ),
FT_FRAME_BYTE ( default_char ),
FT_FRAME_BYTE ( break_char ),
FT_FRAME_USHORT_LE( bytes_per_row ),
FT_FRAME_ULONG_LE ( device_offset ),
FT_FRAME_ULONG_LE ( face_name_offset ),
FT_FRAME_ULONG_LE ( bits_pointer ),
FT_FRAME_ULONG_LE ( bits_offset ),
FT_FRAME_BYTE ( reserved ),
FT_FRAME_ULONG_LE ( flags ),
FT_FRAME_USHORT_LE( A_space ),
FT_FRAME_USHORT_LE( B_space ),
FT_FRAME_USHORT_LE( C_space ),
FT_FRAME_ULONG_LE ( color_table_offset ),
FT_FRAME_BYTES ( reserved1, 16 ),
FT_FRAME_END
};
static void
fnt_font_done( FNT_Face face )
{
FT_Memory memory = FT_FACE( face )->memory;
FT_Stream stream = FT_FACE( face )->stream;
FNT_Font font = face->font;
if ( !font )
return;
if ( font->fnt_frame )
FT_FRAME_RELEASE( font->fnt_frame );
FT_FREE( font->family_name );
FT_FREE( font );
face->font = NULL;
}
static FT_Error
fnt_font_load( FNT_Font font,
FT_Stream stream )
{
FT_Error error;
FT_WinFNT_Header header = &font->header;
FT_Bool new_format;
FT_UInt size;
/* first of all, read the FNT header */
if ( FT_STREAM_SEEK( font->offset ) ||
FT_STREAM_READ_FIELDS( winfnt_header_fields, header ) )
{
FT_TRACE2(( " not a Windows FNT file\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* check header */
if ( header->version != 0x200 &&
header->version != 0x300 )
{
FT_TRACE2(( " not a Windows FNT file\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
new_format = FT_BOOL( font->header.version == 0x300 );
size = new_format ? 148 : 118;
if ( header->file_size < size )
{
FT_TRACE2(( " not a Windows FNT file\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* Version 2 doesn't have these fields */
if ( header->version == 0x200 )
{
header->flags = 0;
header->A_space = 0;
header->B_space = 0;
header->C_space = 0;
header->color_table_offset = 0;
}
if ( header->file_type & 1 )
{
FT_TRACE2(( "[can't handle vector FNT fonts]\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* this is a FNT file/table; extract its frame */
if ( FT_STREAM_SEEK( font->offset ) ||
FT_FRAME_EXTRACT( header->file_size, font->fnt_frame ) )
goto Exit;
Exit:
return error;
}
static FT_Error
fnt_face_get_dll_font( FNT_Face face,
FT_Int face_instance_index )
{
FT_Error error;
FT_Stream stream = FT_FACE( face )->stream;
FT_Memory memory = FT_FACE( face )->memory;
WinMZ_HeaderRec mz_header;
FT_Long face_index;
face->font = NULL;
face_index = FT_ABS( face_instance_index ) & 0xFFFF;
/* does it begin with an MZ header? */
if ( FT_STREAM_SEEK( 0 ) ||
FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) )
{
error = FT_ERR( Unknown_File_Format );
goto Exit;
}
error = FT_ERR( Unknown_File_Format );
if ( mz_header.magic == WINFNT_MZ_MAGIC )
{
/* yes, now look for an NE header in the file */
WinNE_HeaderRec ne_header;
FT_TRACE2(( "MZ signature found\n" ));
if ( FT_STREAM_SEEK( mz_header.lfanew ) ||
FT_STREAM_READ_FIELDS( winne_header_fields, &ne_header ) )
goto Exit;
error = FT_ERR( Unknown_File_Format );
if ( ne_header.magic == WINFNT_NE_MAGIC )
{
/* good, now look into the resource table for each FNT resource */
FT_ULong res_offset = mz_header.lfanew +
ne_header.resource_tab_offset;
FT_UShort size_shift;
FT_UShort font_count = 0;
FT_ULong font_offset = 0;
FT_TRACE2(( "NE signature found\n" ));
if ( FT_STREAM_SEEK( res_offset ) ||
FT_FRAME_ENTER( ne_header.rname_tab_offset -
ne_header.resource_tab_offset ) )
goto Exit;
size_shift = FT_GET_USHORT_LE();
/* Microsoft's specification of the executable-file header format */
/* for `New Executable' (NE) doesn't give a limit for the */
/* alignment shift count; however, in 1985, the year of the */
/* specification release, only 32bit values were supported, thus */
/* anything larger than 16 doesn't make sense in general, given */
/* that file offsets are 16bit values, shifted by the alignment */
/* shift count */
if ( size_shift > 16 )
{
FT_TRACE2(( "invalid alignment shift count for resource data\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit1;
}
for (;;)
{
FT_UShort type_id, count;
type_id = FT_GET_USHORT_LE();
if ( !type_id )
break;
count = FT_GET_USHORT_LE();
if ( type_id == 0x8008U )
{
font_count = count;
font_offset = FT_STREAM_POS() + 4 +
(FT_ULong)( stream->cursor - stream->limit );
break;
}
stream->cursor += 4 + count * 12;
}
FT_FRAME_EXIT();
if ( !font_count || !font_offset )
{
FT_TRACE2(( "this file doesn't contain any FNT resources\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* loading `winfnt_header_fields' needs at least 118 bytes; */
/* use this as a rough measure to check the expected font size */
if ( font_count * 118UL > stream->size )
{
FT_TRACE2(( "invalid number of faces\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
face->root.num_faces = font_count;
if ( face_instance_index < 0 )
goto Exit;
if ( face_index >= font_count )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
if ( FT_NEW( face->font ) )
goto Exit;
if ( FT_STREAM_SEEK( font_offset + (FT_ULong)face_index * 12 ) ||
FT_FRAME_ENTER( 12 ) )
goto Fail;
face->font->offset = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
face->font->fnt_size = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
stream->cursor += 8;
FT_FRAME_EXIT();
error = fnt_font_load( face->font, stream );
}
else if ( ne_header.magic == WINFNT_PE_MAGIC )
{
WinPE32_HeaderRec pe32_header;
WinPE32_SectionRec pe32_section;
WinPE_RsrcDirRec root_dir, name_dir, lang_dir;
WinPE_RsrcDirEntryRec dir_entry1, dir_entry2, dir_entry3;
WinPE_RsrcDataEntryRec data_entry;
FT_ULong root_dir_offset, name_dir_offset, lang_dir_offset;
FT_UShort i, j, k;
FT_TRACE2(( "PE signature found\n" ));
if ( FT_STREAM_SEEK( mz_header.lfanew ) ||
FT_STREAM_READ_FIELDS( winpe32_header_fields, &pe32_header ) )
goto Exit;
FT_TRACE2(( "magic %04lx, machine %02x, number_of_sections %u, "
"size_of_optional_header %02x\n",
pe32_header.magic, pe32_header.machine,
pe32_header.number_of_sections,
pe32_header.size_of_optional_header ));
FT_TRACE2(( "magic32 %02x, rsrc_virtual_address %04lx, "
"rsrc_size %04lx\n",
pe32_header.magic32, pe32_header.rsrc_virtual_address,
pe32_header.rsrc_size ));
if ( pe32_header.magic != WINFNT_PE_MAGIC /* check full signature */ ||
pe32_header.machine != 0x014C /* i386 */ ||
pe32_header.size_of_optional_header != 0xE0 /* FIXME */ ||
pe32_header.magic32 != 0x10B )
{
FT_TRACE2(( "this file has an invalid PE header\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
face->root.num_faces = 0;
for ( i = 0; i < pe32_header.number_of_sections; i++ )
{
if ( FT_STREAM_READ_FIELDS( winpe32_section_fields,
&pe32_section ) )
goto Exit;
FT_TRACE2(( "name %.8s, va %04lx, size %04lx, offset %04lx\n",
pe32_section.name, pe32_section.virtual_address,
pe32_section.size_of_raw_data,
pe32_section.pointer_to_raw_data ));
if ( pe32_header.rsrc_virtual_address ==
pe32_section.virtual_address )
goto Found_rsrc_section;
}
FT_TRACE2(( "this file doesn't contain any resources\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
Found_rsrc_section:
FT_TRACE2(( "found resources section %.8s\n", pe32_section.name ));
if ( FT_STREAM_SEEK( pe32_section.pointer_to_raw_data ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_fields, &root_dir ) )
goto Exit;
root_dir_offset = pe32_section.pointer_to_raw_data;
for ( i = 0; i < root_dir.number_of_named_entries +
root_dir.number_of_id_entries; i++ )
{
if ( FT_STREAM_SEEK( root_dir_offset + 16 + i * 8 ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_entry_fields,
&dir_entry1 ) )
goto Exit;
if ( !(dir_entry1.offset & 0x80000000UL ) /* DataIsDirectory */ )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
dir_entry1.offset &= ~0x80000000UL;
name_dir_offset = pe32_section.pointer_to_raw_data +
dir_entry1.offset;
if ( FT_STREAM_SEEK( pe32_section.pointer_to_raw_data +
dir_entry1.offset ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_fields, &name_dir ) )
goto Exit;
for ( j = 0; j < name_dir.number_of_named_entries +
name_dir.number_of_id_entries; j++ )
{
if ( FT_STREAM_SEEK( name_dir_offset + 16 + j * 8 ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_entry_fields,
&dir_entry2 ) )
goto Exit;
if ( !(dir_entry2.offset & 0x80000000UL ) /* DataIsDirectory */ )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
dir_entry2.offset &= ~0x80000000UL;
lang_dir_offset = pe32_section.pointer_to_raw_data +
dir_entry2.offset;
if ( FT_STREAM_SEEK( pe32_section.pointer_to_raw_data +
dir_entry2.offset ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_fields, &lang_dir ) )
goto Exit;
for ( k = 0; k < lang_dir.number_of_named_entries +
lang_dir.number_of_id_entries; k++ )
{
if ( FT_STREAM_SEEK( lang_dir_offset + 16 + k * 8 ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_dir_entry_fields,
&dir_entry3 ) )
goto Exit;
if ( dir_entry2.offset & 0x80000000UL /* DataIsDirectory */ )
{
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( dir_entry1.name == 8 /* RT_FONT */ )
{
if ( FT_STREAM_SEEK( root_dir_offset + dir_entry3.offset ) ||
FT_STREAM_READ_FIELDS( winpe_rsrc_data_entry_fields,
&data_entry ) )
goto Exit;
FT_TRACE2(( "found font #%lu, offset %04lx, "
"size %04lx, cp %lu\n",
dir_entry2.name,
pe32_section.pointer_to_raw_data +
data_entry.offset_to_data -
pe32_section.virtual_address,
data_entry.size, data_entry.code_page ));
if ( face_index == face->root.num_faces )
{
if ( FT_NEW( face->font ) )
goto Exit;
face->font->offset = pe32_section.pointer_to_raw_data +
data_entry.offset_to_data -
pe32_section.virtual_address;
face->font->fnt_size = data_entry.size;
error = fnt_font_load( face->font, stream );
if ( error )
{
FT_TRACE2(( "font #%lu load error 0x%x\n",
dir_entry2.name, error ));
goto Fail;
}
else
FT_TRACE2(( "font #%lu successfully loaded\n",
dir_entry2.name ));
}
face->root.num_faces++;
}
}
}
}
}
if ( !face->root.num_faces )
{
FT_TRACE2(( "this file doesn't contain any RT_FONT resources\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
if ( face_index >= face->root.num_faces )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
}
Fail:
if ( error )
fnt_font_done( face );
Exit:
return error;
Exit1:
FT_FRAME_EXIT();
goto Exit;
}
typedef struct FNT_CMapRec_
{
FT_CMapRec cmap;
FT_UInt32 first;
FT_UInt32 count;
} FNT_CMapRec, *FNT_CMap;
static FT_Error
fnt_cmap_init( FNT_CMap cmap,
FT_Pointer pointer )
{
FNT_Face face = (FNT_Face)FT_CMAP_FACE( cmap );
FNT_Font font = face->font;
FT_UNUSED( pointer );
cmap->first = (FT_UInt32) font->header.first_char;
cmap->count = (FT_UInt32)( font->header.last_char - cmap->first + 1 );
return 0;
}
static FT_UInt
fnt_cmap_char_index( FNT_CMap cmap,
FT_UInt32 char_code )
{
FT_UInt gindex = 0;
char_code -= cmap->first;
if ( char_code < cmap->count )
/* we artificially increase the glyph index; */
/* FNT_Load_Glyph reverts to the right one */
gindex = (FT_UInt)( char_code + 1 );
return gindex;
}
static FT_UInt32
fnt_cmap_char_next( FNT_CMap cmap,
FT_UInt32 *pchar_code )
{
FT_UInt gindex = 0;
FT_UInt32 result = 0;
FT_UInt32 char_code = *pchar_code + 1;
if ( char_code <= cmap->first )
{
result = cmap->first;
gindex = 1;
}
else
{
char_code -= cmap->first;
if ( char_code < cmap->count )
{
result = cmap->first + char_code;
gindex = (FT_UInt)( char_code + 1 );
}
}
*pchar_code = result;
return gindex;
}
static const FT_CMap_ClassRec fnt_cmap_class_rec =
{
sizeof ( FNT_CMapRec ),
(FT_CMap_InitFunc) fnt_cmap_init,
(FT_CMap_DoneFunc) NULL,
(FT_CMap_CharIndexFunc)fnt_cmap_char_index,
(FT_CMap_CharNextFunc) fnt_cmap_char_next,
NULL, NULL, NULL, NULL, NULL
};
static FT_CMap_Class const fnt_cmap_class = &fnt_cmap_class_rec;
static void
FNT_Face_Done( FT_Face fntface ) /* FNT_Face */
{
FNT_Face face = (FNT_Face)fntface;
FT_Memory memory;
if ( !face )
return;
memory = FT_FACE_MEMORY( face );
fnt_font_done( face );
FT_FREE( fntface->available_sizes );
fntface->num_fixed_sizes = 0;
}
static FT_Error
FNT_Face_Init( FT_Stream stream,
FT_Face fntface, /* FNT_Face */
FT_Int face_instance_index,
FT_Int num_params,
FT_Parameter* params )
{
FNT_Face face = (FNT_Face)fntface;
FT_Error error;
FT_Memory memory = FT_FACE_MEMORY( face );
FT_Int face_index;
FT_UNUSED( num_params );
FT_UNUSED( params );
FT_TRACE2(( "Windows FNT driver\n" ));
face_index = FT_ABS( face_instance_index ) & 0xFFFF;
/* try to load font from a DLL */
error = fnt_face_get_dll_font( face, face_instance_index );
if ( !error && face_instance_index < 0 )
goto Exit;
if ( FT_ERR_EQ( error, Unknown_File_Format ) )
{
/* this didn't work; try to load a single FNT font */
FNT_Font font;
if ( FT_NEW( face->font ) )
goto Exit;
fntface->num_faces = 1;
font = face->font;
font->offset = 0;
font->fnt_size = stream->size;
error = fnt_font_load( font, stream );
if ( !error )
{
if ( face_instance_index < 0 )
goto Exit;
if ( face_index > 0 )
error = FT_THROW( Invalid_Argument );
}
}
if ( error )
goto Fail;
/* sanity check */
if ( !face->font->header.pixel_height )
{
FT_TRACE2(( "invalid pixel height\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
/* we now need to fill the root FT_Face fields */
/* with relevant information */
{
FT_Face root = FT_FACE( face );
FNT_Font font = face->font;
FT_ULong family_size;
root->face_index = face_index;
root->face_flags |= FT_FACE_FLAG_FIXED_SIZES |
FT_FACE_FLAG_HORIZONTAL;
if ( font->header.avg_width == font->header.max_width )
root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
if ( font->header.italic )
root->style_flags |= FT_STYLE_FLAG_ITALIC;
if ( font->header.weight >= 800 )
root->style_flags |= FT_STYLE_FLAG_BOLD;
/* set up the `fixed_sizes' array */
if ( FT_QNEW( root->available_sizes ) )
goto Fail;
root->num_fixed_sizes = 1;
{
FT_Bitmap_Size* bsize = root->available_sizes;
FT_UShort x_res, y_res;
bsize->width = (FT_Short)font->header.avg_width;
bsize->height = (FT_Short)( font->header.pixel_height +
font->header.external_leading );
bsize->size = font->header.nominal_point_size << 6;
x_res = font->header.horizontal_resolution;
if ( !x_res )
x_res = 72;
y_res = font->header.vertical_resolution;
if ( !y_res )
y_res = 72;
bsize->y_ppem = FT_MulDiv( bsize->size, y_res, 72 );
bsize->y_ppem = FT_PIX_ROUND( bsize->y_ppem );
/*
* this reads:
*
* the nominal height is larger than the bbox's height
*
* => nominal_point_size contains incorrect value;
* use pixel_height as the nominal height
*/
if ( bsize->y_ppem > ( font->header.pixel_height << 6 ) )
{
FT_TRACE2(( "use pixel_height as the nominal height\n" ));
bsize->y_ppem = font->header.pixel_height << 6;
bsize->size = FT_MulDiv( bsize->y_ppem, 72, y_res );
}
bsize->x_ppem = FT_MulDiv( bsize->size, x_res, 72 );
bsize->x_ppem = FT_PIX_ROUND( bsize->x_ppem );
}
{
FT_CharMapRec charmap;
charmap.encoding = FT_ENCODING_NONE;
/* initial platform/encoding should indicate unset status? */
charmap.platform_id = TT_PLATFORM_APPLE_UNICODE;
charmap.encoding_id = TT_APPLE_ID_DEFAULT;
charmap.face = root;
if ( font->header.charset == FT_WinFNT_ID_MAC )
{
charmap.encoding = FT_ENCODING_APPLE_ROMAN;
charmap.platform_id = TT_PLATFORM_MACINTOSH;
/* charmap.encoding_id = TT_MAC_ID_ROMAN; */
}
error = FT_CMap_New( fnt_cmap_class,
NULL,
&charmap,
NULL );
if ( error )
goto Fail;
}
/* set up remaining flags */
if ( font->header.last_char < font->header.first_char )
{
FT_TRACE2(( "invalid number of glyphs\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
/* reserve one slot for the .notdef glyph at index 0 */
root->num_glyphs = font->header.last_char -
font->header.first_char + 1 + 1;
if ( font->header.face_name_offset >= font->header.file_size )
{
FT_TRACE2(( "invalid family name offset\n" ));
error = FT_THROW( Invalid_File_Format );
goto Fail;
}
family_size = font->header.file_size - font->header.face_name_offset;
/* Some broken fonts don't delimit the face name with a final */
/* null byte -- the frame is erroneously one byte too small. */
/* We thus allocate one more byte, setting it explicitly to */
/* zero. */
if ( FT_QALLOC( font->family_name, family_size + 1 ) )
goto Fail;
FT_MEM_COPY( font->family_name,
font->fnt_frame + font->header.face_name_offset,
family_size );
font->family_name[family_size] = '\0';
/* shrink it to the actual length */
if ( FT_QREALLOC( font->family_name,
family_size + 1,
ft_strlen( font->family_name ) + 1 ) )
goto Fail;
root->family_name = font->family_name;
root->style_name = (char *)"Regular";
if ( root->style_flags & FT_STYLE_FLAG_BOLD )
{
if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
root->style_name = (char *)"Bold Italic";
else
root->style_name = (char *)"Bold";
}
else if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
root->style_name = (char *)"Italic";
}
goto Exit;
Fail:
FNT_Face_Done( fntface );
Exit:
return error;
}
static FT_Error
FNT_Size_Select( FT_Size size,
FT_ULong strike_index )
{
FNT_Face face = (FNT_Face)size->face;
FT_WinFNT_Header header = &face->font->header;
FT_UNUSED( strike_index );
FT_Select_Metrics( size->face, 0 );
size->metrics.ascender = header->ascent * 64;
size->metrics.descender = -( header->pixel_height -
header->ascent ) * 64;
size->metrics.max_advance = header->max_width * 64;
return FT_Err_Ok;
}
static FT_Error
FNT_Size_Request( FT_Size size,
FT_Size_Request req )
{
FNT_Face face = (FNT_Face)size->face;
FT_WinFNT_Header header = &face->font->header;
FT_Bitmap_Size* bsize = size->face->available_sizes;
FT_Error error = FT_ERR( Invalid_Pixel_Size );
FT_Long height;
height = FT_REQUEST_HEIGHT( req );
height = ( height + 32 ) >> 6;
switch ( req->type )
{
case FT_SIZE_REQUEST_TYPE_NOMINAL:
if ( height == ( ( bsize->y_ppem + 32 ) >> 6 ) )
error = FT_Err_Ok;
break;
case FT_SIZE_REQUEST_TYPE_REAL_DIM:
if ( height == header->pixel_height )
error = FT_Err_Ok;
break;
default:
error = FT_THROW( Unimplemented_Feature );
break;
}
if ( error )
return error;
else
return FNT_Size_Select( size, 0 );
}
static FT_Error
FNT_Load_Glyph( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
FNT_Face face = (FNT_Face)FT_SIZE_FACE( size );
FNT_Font font;
FT_Error error = FT_Err_Ok;
FT_Byte* p;
FT_UInt len;
FT_Bitmap* bitmap = &slot->bitmap;
FT_ULong offset;
FT_Bool new_format;
if ( !face )
{
error = FT_THROW( Invalid_Face_Handle );
goto Exit;
}
font = face->font;
if ( !font ||
glyph_index >= (FT_UInt)( FT_FACE( face )->num_glyphs ) )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_TRACE1(( "FNT_Load_Glyph: glyph index %d\n", glyph_index ));
if ( glyph_index > 0 )
glyph_index--; /* revert to real index */
else
glyph_index = font->header.default_char; /* the `.notdef' glyph */
new_format = FT_BOOL( font->header.version == 0x300 );
len = new_format ? 6 : 4;
/* get glyph width and offset */
offset = ( new_format ? 148 : 118 ) + len * glyph_index;
if ( offset >= font->header.file_size - 2 - ( new_format ? 4 : 2 ) )
{
FT_TRACE2(( "invalid FNT offset\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
p = font->fnt_frame + offset;
bitmap->width = FT_NEXT_USHORT_LE( p );
/* jump to glyph entry */
if ( new_format )
offset = FT_NEXT_ULONG_LE( p );
else
offset = FT_NEXT_USHORT_LE( p );
if ( offset >= font->header.file_size )
{
FT_TRACE2(( "invalid FNT offset\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
bitmap->rows = font->header.pixel_height;
bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
slot->bitmap_left = 0;
slot->bitmap_top = font->header.ascent;
slot->format = FT_GLYPH_FORMAT_BITMAP;
/* now set up metrics */
slot->metrics.width = (FT_Pos)( bitmap->width << 6 );
slot->metrics.height = (FT_Pos)( bitmap->rows << 6 );
slot->metrics.horiAdvance = (FT_Pos)( bitmap->width << 6 );
slot->metrics.horiBearingX = 0;
slot->metrics.horiBearingY = slot->bitmap_top << 6;
ft_synthesize_vertical_metrics( &slot->metrics,
(FT_Pos)( bitmap->rows << 6 ) );
if ( load_flags & FT_LOAD_BITMAP_METRICS_ONLY )
goto Exit;
/* jump to glyph data */
p = font->fnt_frame + /* font->header.bits_offset */ + offset;
/* allocate and build bitmap */
{
FT_Memory memory = FT_FACE_MEMORY( slot->face );
FT_UInt pitch = ( bitmap->width + 7 ) >> 3;
FT_Byte* column;
FT_Byte* write;
bitmap->pitch = (int)pitch;
if ( !pitch ||
offset + pitch * bitmap->rows > font->header.file_size )
{
FT_TRACE2(( "invalid bitmap width\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
/* note: since glyphs are stored in columns and not in rows we */
/* can't use ft_glyphslot_set_bitmap */
if ( FT_QALLOC_MULT( bitmap->buffer, bitmap->rows, pitch ) )
goto Exit;
column = (FT_Byte*)bitmap->buffer;
for ( ; pitch > 0; pitch--, column++ )
{
FT_Byte* limit = p + bitmap->rows;
for ( write = column; p < limit; p++, write += bitmap->pitch )
*write = *p;
}
slot->internal->flags = FT_GLYPH_OWN_BITMAP;
}
Exit:
return error;
}
static FT_Error
winfnt_get_header( FT_Face face,
FT_WinFNT_HeaderRec *aheader )
{
FNT_Font font = ((FNT_Face)face)->font;
*aheader = font->header;
return 0;
}
static const FT_Service_WinFntRec winfnt_service_rec =
{
winfnt_get_header /* get_header */
};
/*
* SERVICE LIST
*
*/
static const FT_ServiceDescRec winfnt_services[] =
{
{ FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_WINFNT },
{ FT_SERVICE_ID_WINFNT, &winfnt_service_rec },
{ NULL, NULL }
};
static FT_Module_Interface
winfnt_get_service( FT_Module module,
const FT_String* service_id )
{
FT_UNUSED( module );
return ft_service_list_lookup( winfnt_services, service_id );
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec winfnt_driver_class =
{
{
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_NO_OUTLINES,
sizeof ( FT_DriverRec ),
"winfonts",
0x10000L,
0x20000L,
NULL, /* module-specific interface */
NULL, /* FT_Module_Constructor module_init */
NULL, /* FT_Module_Destructor module_done */
winfnt_get_service /* FT_Module_Requester get_interface */
},
sizeof ( FNT_FaceRec ),
sizeof ( FT_SizeRec ),
sizeof ( FT_GlyphSlotRec ),
FNT_Face_Init, /* FT_Face_InitFunc init_face */
FNT_Face_Done, /* FT_Face_DoneFunc done_face */
NULL, /* FT_Size_InitFunc init_size */
NULL, /* FT_Size_DoneFunc done_size */
NULL, /* FT_Slot_InitFunc init_slot */
NULL, /* FT_Slot_DoneFunc done_slot */
FNT_Load_Glyph, /* FT_Slot_LoadFunc load_glyph */
NULL, /* FT_Face_GetKerningFunc get_kerning */
NULL, /* FT_Face_AttachFunc attach_file */
NULL, /* FT_Face_GetAdvancesFunc get_advances */
FNT_Size_Request, /* FT_Size_RequestFunc request_size */
FNT_Size_Select /* FT_Size_SelectFunc select_size */
};
/* END */