ref: f1c7814718e5326b32d6202c572e5629a80e222c
dir: /src/winfonts/winfnt.c/
/***************************************************************************/
/* */
/* winfnt.c */
/* */
/* FreeType font driver for Windows FNT/FON files */
/* */
/* Copyright 1996-2001, 2002, 2003 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 <ft2build.h>
#include FT_WINFONTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_FNT_TYPES_H
#include "winfnt.h"
#include "fnterrs.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_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 winfnt_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE FT_WinFNT_HeaderRec
FT_FRAME_START( 146 ),
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_USHORT_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 );
face->font = 0;
}
static FT_Error
fnt_font_load( FNT_Font font,
FT_Stream stream )
{
FT_Error error;
FT_WinFNT_Header header = &font->header;
/* first of all, read the FNT header */
if ( FT_STREAM_SEEK( font->offset ) ||
FT_STREAM_READ_FIELDS( winfnt_header_fields, header ) )
goto Exit;
/* check header */
if ( header->version != 0x200 &&
header->version != 0x300 )
{
FT_TRACE2(( "[not a valid FNT file]\n" ));
error = FNT_Err_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 = FNT_Err_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_index )
{
FT_Error error;
FT_Stream stream = FT_FACE( face )->stream;
FT_Memory memory = FT_FACE( face )->memory;
WinMZ_HeaderRec mz_header;
face->font = 0;
/* does it begin with an MZ header? */
if ( FT_STREAM_SEEK( 0 ) ||
FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) )
goto Exit;
error = FNT_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;
if ( FT_STREAM_SEEK( mz_header.lfanew ) ||
FT_STREAM_READ_FIELDS( winne_header_fields, &ne_header ) )
goto Exit;
error = FNT_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;
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();
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_ULong)( FT_STREAM_POS() + 4 +
( 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 = FNT_Err_Unknown_File_Format;
goto Exit;
}
face->root.num_faces = font_count;
if ( face_index >= font_count )
{
error = FNT_Err_Bad_Argument;
goto Exit;
}
if ( FT_NEW( face->font ) )
goto Exit;
if ( FT_STREAM_SEEK( font_offset + 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;
face->font->size_shift = size_shift;
stream->cursor += 8;
FT_FRAME_EXIT();
error = fnt_font_load( face->font, stream );
}
}
Fail:
if ( error )
fnt_font_done( face );
Exit:
return error;
}
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 )
{
FNT_Face face = (FNT_Face)FT_CMAP_FACE( cmap );
FNT_Font font = face->font;
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 )
gindex = char_code + 1; /* we artificially increase the glyph index; */
/* FNT_Load_Glyph reverts to the right one */
return gindex;
}
static FT_UInt
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 = char_code + 1;
}
}
*pchar_code = result;
return gindex;
}
static 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
};
static FT_CMap_Class fnt_cmap_class = &fnt_cmap_class_rec;
static void
FNT_Face_Done( FNT_Face face )
{
FT_Memory memory = FT_FACE_MEMORY( face );
fnt_font_done( face );
FT_FREE( face->root.available_sizes );
face->root.num_fixed_sizes = 0;
}
static FT_Error
FNT_Face_Init( FT_Stream stream,
FNT_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error;
FT_Memory memory = FT_FACE_MEMORY( face );
FT_UNUSED( num_params );
FT_UNUSED( params );
/* try to load font from a DLL */
error = fnt_face_get_dll_font( face, face_index );
if ( error )
{
/* this didn't work; try to load a single FNT font */
FNT_Font font;
if ( FT_NEW( face->font ) )
goto Exit;
face->root.num_faces = 1;
font = face->font;
font->offset = 0;
font->fnt_size = stream->size;
error = fnt_font_load( font, stream );
if ( error )
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;
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_NEW_ARRAY( root->available_sizes, 1 ) )
goto Fail;
root->num_fixed_sizes = 1;
{
FT_Bitmap_Size* bsize = root->available_sizes;
bsize->width = font->header.avg_width;
bsize->height =
font->header.pixel_height + font->header.external_leading;
bsize->size = font->header.nominal_point_size << 6;
bsize->x_ppem =
(FT_Pos)( ( font->header.horizontal_resolution * bsize->size + 36 )
/ 72 );
bsize->y_ppem =
(FT_Pos)( ( font->header.vertical_resolution* bsize->size + 36 )
/ 72 );
}
{
FT_CharMapRec charmap;
charmap.encoding = FT_ENCODING_UNICODE;
charmap.platform_id = 3;
charmap.encoding_id = 1;
charmap.face = root;
error = FT_CMap_New( fnt_cmap_class,
NULL,
&charmap,
NULL );
if ( error )
goto Fail;
/* Select default charmap */
if ( root->num_charmaps )
root->charmap = root->charmaps[0];
}
/* setup remaining flags */
/* reserve one slot for the .notdef glyph at index 0 */
root->num_glyphs = font->header.last_char -
font->header.first_char + 1 + 1;
root->family_name = (FT_String*)font->fnt_frame +
font->header.face_name_offset;
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";
}
Fail:
if ( error )
FNT_Face_Done( face );
Exit:
return error;
}
static FT_Error
FNT_Size_Set_Pixels( FT_Size size )
{
FNT_Face face = (FNT_Face)FT_SIZE_FACE( size );
FT_Face root = FT_FACE( face );
if ( size->metrics.y_ppem == root->available_sizes->height )
{
FNT_Font font = face->font;
size->metrics.ascender = font->header.ascent * 64;
size->metrics.descender = ( font->header.pixel_height -
font->header.ascent ) * 64;
size->metrics.height = font->header.pixel_height * 64;
size->metrics.max_advance = font->header.max_width * 64;
return FNT_Err_Ok;
}
else
return FNT_Err_Invalid_Pixel_Size;
}
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 = face->font;
FT_Error error = FNT_Err_Ok;
FT_Byte* p;
FT_Int len;
FT_Bitmap* bitmap = &slot->bitmap;
FT_ULong offset;
FT_Bool new_format;
FT_UNUSED( load_flags );
if ( !face || !font )
{
error = FNT_Err_Invalid_Argument;
goto Exit;
}
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;
/* jump to glyph entry */
p = font->fnt_frame + ( new_format ? 146 : 118 ) + len * glyph_index;
bitmap->width = FT_NEXT_SHORT_LE( p );
if ( new_format )
offset = FT_NEXT_ULONG_LE( p );
else
offset = FT_NEXT_USHORT_LE( p );
/* 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_Int pitch = ( bitmap->width + 7 ) >> 3;
FT_Byte* column;
FT_Byte* write;
bitmap->pitch = pitch;
bitmap->rows = font->header.pixel_height;
bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
/* note: since glyphs are stored in columns and not in rows we */
/* can't use ft_glyphslot_set_bitmap */
if ( FT_ALLOC( bitmap->buffer, pitch * bitmap->rows ) )
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;
slot->bitmap_left = 0;
slot->bitmap_top = font->header.ascent;
slot->format = FT_GLYPH_FORMAT_BITMAP;
/* now set up metrics */
slot->metrics.horiAdvance = bitmap->width << 6;
slot->metrics.horiBearingX = 0;
slot->metrics.horiBearingY = slot->bitmap_top << 6;
slot->linearHoriAdvance = (FT_Fixed)bitmap->width << 16;
slot->format = FT_GLYPH_FORMAT_BITMAP;
Exit:
return error;
}
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,
0,
(FT_Module_Constructor)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
},
sizeof( FNT_FaceRec ),
sizeof( FT_SizeRec ),
sizeof( FT_GlyphSlotRec ),
(FT_Face_InitFunc) FNT_Face_Init,
(FT_Face_DoneFunc) FNT_Face_Done,
(FT_Size_InitFunc) 0,
(FT_Size_DoneFunc) 0,
(FT_Slot_InitFunc) 0,
(FT_Slot_DoneFunc) 0,
(FT_Size_ResetPointsFunc) FNT_Size_Set_Pixels,
(FT_Size_ResetPixelsFunc) FNT_Size_Set_Pixels,
(FT_Slot_LoadFunc) FNT_Load_Glyph,
(FT_Face_GetKerningFunc) 0,
(FT_Face_AttachFunc) 0,
(FT_Face_GetAdvancesFunc) 0
};
/* END */