ref: ce9a0441ad2f0508649251373ceedb1b01f97b22
dir: /src/winfonts/winfnt.c/
/***************************************************************************/
/* */
/* winfnt.c */
/* */
/* FreeType font driver for Windows FNT/FON files */
/* */
/* Copyright 1996-2001 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_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_Header
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_Header
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 WinFNT_Header
FT_FRAME_START( 134 ),
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 ( reserved, 4 ),
FT_FRAME_END
};
static void
fnt_font_done( FNT_Font* font,
FT_Stream stream )
{
if ( font->fnt_frame )
RELEASE_Frame( font->fnt_frame );
font->fnt_size = 0;
font->fnt_frame = 0;
}
static FT_Error
fnt_font_load( FNT_Font* font,
FT_Stream stream )
{
FT_Error error;
WinFNT_Header* header = &font->header;
/* first of all, read the FNT header */
if ( FILE_Seek( font->offset ) ||
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;
}
if ( header->file_type & 1 )
{
FT_TRACE2(( "[can't handle vector FNT fonts]\n" ));
error = FNT_Err_Unknown_File_Format;
goto Exit;
}
/* small fixup -- some fonts have the `pixel_width' field set to 0 */
if ( header->pixel_width == 0 )
header->pixel_width = header->pixel_height;
/* this is a FNT file/table, we now extract its frame */
if ( FILE_Seek( font->offset ) ||
EXTRACT_Frame( header->file_size, font->fnt_frame ) )
goto Exit;
Exit:
return error;
}
static void
fnt_face_done_fonts( FNT_Face face )
{
FT_Memory memory = FT_FACE(face)->memory;
FT_Stream stream = FT_FACE(face)->stream;
FNT_Font* cur = face->fonts;
FNT_Font* limit = cur + face->num_fonts;
for ( ; cur < limit; cur++ )
fnt_font_done( cur, stream );
FREE( face->fonts );
face->num_fonts = 0;
}
static FT_Error
fnt_face_get_dll_fonts( FNT_Face face )
{
FT_Error error;
FT_Stream stream = FT_FACE(face)->stream;
FT_Memory memory = FT_FACE(face)->memory;
WinMZ_Header mz_header;
face->fonts = 0;
face->num_fonts = 0;
/* does it begin with a MZ header? */
if ( FILE_Seek( 0 ) ||
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 a NE header in the file */
WinNE_Header ne_header;
if ( FILE_Seek( mz_header.lfanew ) ||
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 in 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 ( FILE_Seek( res_offset ) ||
ACCESS_Frame( ne_header.rname_tab_offset -
ne_header.resource_tab_offset ) )
goto Exit;
size_shift = GET_UShortLE();
for (;;)
{
FT_UShort type_id, count;
type_id = GET_UShortLE();
if ( !type_id )
break;
count = GET_UShortLE();
if ( type_id == 0x8008 )
{
font_count = count;
font_offset = (FT_ULong)( FILE_Pos() + 4 +
( stream->cursor - stream->limit ) );
break;
}
stream->cursor += 4 + count * 12;
}
FORGET_Frame();
if ( !font_count || !font_offset )
{
FT_TRACE2(( "this file doesn't contain any FNT resources!\n" ));
error = FNT_Err_Unknown_File_Format;
goto Exit;
}
if ( FILE_Seek( font_offset ) ||
ALLOC_ARRAY( face->fonts, font_count, FNT_Font ) )
goto Exit;
face->num_fonts = font_count;
if ( ACCESS_Frame( (FT_Long)font_count * 12 ) )
goto Exit;
/* now read the offset and position of each FNT font */
{
FNT_Font* cur = face->fonts;
FNT_Font* limit = cur + font_count;
for ( ; cur < limit; cur++ )
{
cur->offset = (FT_ULong)GET_UShortLE() << size_shift;
cur->fnt_size = (FT_ULong)GET_UShortLE() << size_shift;
cur->size_shift = size_shift;
stream->cursor += 8;
}
}
FORGET_Frame();
/* finally, try to load each font there */
{
FNT_Font* cur = face->fonts;
FNT_Font* limit = cur + font_count;
for ( ; cur < limit; cur++ )
{
error = fnt_font_load( cur, stream );
if ( error )
goto Fail;
}
}
}
}
Fail:
if ( error )
fnt_face_done_fonts( face );
Exit:
return error;
}
static void
FNT_Face_Done( FNT_Face face )
{
FT_Memory memory = FT_FACE_MEMORY( face );
fnt_face_done_fonts( face );
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 );
FT_UNUSED( face_index );
/* try to load several fonts from a DLL */
error = fnt_face_get_dll_fonts( face );
if ( error )
{
/* this didn't work, now try to load a single FNT font */
FNT_Font* font;
if ( ALLOC( face->fonts, sizeof ( *face->fonts ) ) )
goto Exit;
face->num_fonts = 1;
font = face->fonts;
font->offset = 0;
font->fnt_size = stream->size;
error = fnt_font_load( font, stream );
if ( error )
goto Fail;
}
/* all right, one or more fonts were loaded; we now need to */
/* fill the root FT_Face fields with relevant information */
{
FT_Face root = FT_FACE( face );
FNT_Font* fonts = face->fonts;
FNT_Font* limit = fonts + face->num_fonts;
FNT_Font* cur;
root->num_faces = 1;
root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
FT_FACE_FLAG_HORIZONTAL;
if ( fonts->header.avg_width == fonts->header.max_width )
root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
if ( fonts->header.italic )
root->style_flags |= FT_STYLE_FLAG_ITALIC;
if ( fonts->header.weight >= 800 )
root->style_flags |= FT_STYLE_FLAG_BOLD;
/* Setup the `fixed_sizes' array */
if ( ALLOC_ARRAY( root->available_sizes, face->num_fonts,
FT_Bitmap_Size ) )
goto Fail;
root->num_fixed_sizes = face->num_fonts;
{
FT_Bitmap_Size* size = root->available_sizes;
for ( cur = fonts; cur < limit; cur++, size++ )
{
size->width = cur->header.pixel_width;
size->height = cur->header.pixel_height;
}
}
/* Setup the `charmaps' array */
root->charmaps = &face->charmap_handle;
root->num_charmaps = 1;
face->charmap.encoding = ft_encoding_unicode;
face->charmap.platform_id = 3;
face->charmap.encoding_id = 1;
face->charmap.face = root;
face->charmap_handle = &face->charmap;
root->charmap = face->charmap_handle;
/* setup remaining flags */
root->num_glyphs = fonts->header.last_char -
fonts->header.first_char + 1;
root->family_name = (FT_String*)fonts->fnt_frame +
fonts->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( FNT_Size size )
{
/* look up a font corresponding to the current pixel size */
FNT_Face face = (FNT_Face)FT_SIZE_FACE( size );
FNT_Font* cur = face->fonts;
FNT_Font* limit = cur + face->num_fonts;
size->font = 0;
for ( ; cur < limit; cur++ )
{
/* we only compare the character height, as fonts used some strange */
/* values */
if ( cur->header.pixel_height == size->root.metrics.y_ppem )
{
size->font = cur;
size->root.metrics.ascender = cur->header.ascent * 64;
size->root.metrics.descender = ( cur->header.pixel_height -
cur->header.ascent ) * 64;
size->root.metrics.height = cur->header.pixel_height * 64;
break;
}
}
return ( size->font ? FNT_Err_Ok : FNT_Err_Invalid_Pixel_Size );
}
static FT_UInt
FNT_Get_Char_Index( FT_CharMap charmap,
FT_Long char_code )
{
FT_Long result = char_code;
if ( charmap )
{
FNT_Font* font = ((FNT_Face)charmap->face)->fonts;
FT_Long first = font->header.first_char;
FT_Long count = font->header.last_char - first + 1;
char_code -= first;
if ( char_code < count )
result = char_code + 1;
else
result = 0;
}
return result;
}
static FT_Error
FNT_Load_Glyph( FT_GlyphSlot slot,
FNT_Size size,
FT_UInt glyph_index,
FT_Int load_flags )
{
FNT_Font* font = size->font;
FT_Error error = 0;
FT_Byte* p;
FT_Int len;
FT_Bitmap* bitmap = &slot->bitmap;
FT_ULong offset;
FT_Bool new_format;
FT_UNUSED( slot );
FT_UNUSED( load_flags );
if ( !font )
{
error = FNT_Err_Invalid_Argument;
goto Exit;
}
if ( glyph_index > 0 )
glyph_index--;
else
glyph_index = font->header.default_char - font->header.first_char;
new_format = FT_BOOL( font->header.version == 0x300 );
len = new_format ? 6 : 4;
/* jump to glyph entry */
p = font->fnt_frame + 118 + len * glyph_index;
bitmap->width = NEXT_ShortLE(p);
if ( new_format )
offset = NEXT_ULongLE(p);
else
offset = NEXT_UShortLE(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;
if ( 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[0] = p[0];
}
}
slot->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_Class winfnt_driver_class =
{
{
ft_module_font_driver,
sizeof ( FT_DriverRec ),
"winfonts",
0x10000L,
0x20000L,
0,
(FT_Module_Constructor)0,
(FT_Module_Destructor) 0,
(FT_Module_Requester) 0
},
sizeof( FNT_FaceRec ),
sizeof( FNT_SizeRec ),
sizeof( FT_GlyphSlotRec ),
(FTDriver_initFace) FNT_Face_Init,
(FTDriver_doneFace) FNT_Face_Done,
(FTDriver_initSize) 0,
(FTDriver_doneSize) 0,
(FTDriver_initGlyphSlot)0,
(FTDriver_doneGlyphSlot)0,
(FTDriver_setCharSizes) FNT_Size_Set_Pixels,
(FTDriver_setPixelSizes)FNT_Size_Set_Pixels,
(FTDriver_loadGlyph) FNT_Load_Glyph,
(FTDriver_getCharIndex) FNT_Get_Char_Index,
(FTDriver_getKerning) 0,
(FTDriver_attachFile) 0,
(FTDriver_getAdvances) 0
};
#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
/*************************************************************************/
/* */
/* <Function> */
/* getDriverClass */
/* */
/* <Description> */
/* This function is used when compiling the TrueType driver as a */
/* shared library (`.DLL' or `.so'). It will be used by the */
/* high-level library of FreeType to retrieve the address of the */
/* driver's generic interface. */
/* */
/* It shouldn't be implemented in a static build, as each driver must */
/* have the same function as an exported entry point. */
/* */
/* <Return> */
/* The address of the TrueType's driver generic interface. The */
/* format-specific interface can then be retrieved through the method */
/* interface->get_format_interface. */
/* */
FT_EXPORT_DEF( const FT_Driver_Class* )
getDriverClass( void )
{
return &winfnt_driver_class;
}
#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */
/* END */