ref: ab9cc277c2d695b2d253610d9867256aa2a3ad8f
dir: /src/winfonts/winfnt.c/
/***************************************************************************/
/* */
/* winfnt.c */
/* */
/* FreeType font driver for Windows FNT/FON files */
/* */
/* 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 <winfnt.h>
#include <freetype/fterrors.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftobjs.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttobjs
static const FT_Frame_Field winmz_header_fields[] =
{ FT_FRAME_START( 64 ),
FT_FRAME_USHORT_LE ( WinMZ_Header, magic ),
FT_FRAME_SKIP_BYTES( 29*2 ),
FT_FRAME_ULONG_LE ( WinMZ_Header, lfanew ),
FT_FRAME_END };
static const FT_Frame_Field winne_header_fields[] =
{ FT_FRAME_START( 40 ),
FT_FRAME_USHORT_LE( WinNE_Header, magic ),
FT_FRAME_SKIP_BYTES( 34 ),
FT_FRAME_USHORT_LE( WinNE_Header, resource_tab_offset ),
FT_FRAME_USHORT_LE( WinNE_Header, rname_tab_offset ),
FT_FRAME_END };
static const FT_Frame_Field winfnt_header_fields[] =
{ FT_FRAME_START( 134 ),
FT_FRAME_USHORT_LE( WinFNT_Header, version ),
FT_FRAME_ULONG_LE ( WinFNT_Header, file_size ),
FT_FRAME_BYTES ( WinFNT_Header, copyright, 60 ),
FT_FRAME_USHORT_LE( WinFNT_Header, file_type ),
FT_FRAME_USHORT_LE( WinFNT_Header, nominal_point_size ),
FT_FRAME_USHORT_LE( WinFNT_Header, vertical_resolution ),
FT_FRAME_USHORT_LE( WinFNT_Header, horizontal_resolution ),
FT_FRAME_USHORT_LE( WinFNT_Header, ascent ),
FT_FRAME_USHORT_LE( WinFNT_Header, internal_leading ),
FT_FRAME_USHORT_LE( WinFNT_Header, external_leading ),
FT_FRAME_BYTE ( WinFNT_Header, italic ),
FT_FRAME_BYTE ( WinFNT_Header, underline ),
FT_FRAME_BYTE ( WinFNT_Header, strike_out ),
FT_FRAME_USHORT_LE( WinFNT_Header, weight ),
FT_FRAME_BYTE ( WinFNT_Header, charset ),
FT_FRAME_USHORT_LE( WinFNT_Header, pixel_width ),
FT_FRAME_USHORT_LE( WinFNT_Header, pixel_height ),
FT_FRAME_BYTE ( WinFNT_Header, pitch_and_family ),
FT_FRAME_USHORT_LE( WinFNT_Header, avg_width ),
FT_FRAME_USHORT_LE( WinFNT_Header, max_width ),
FT_FRAME_BYTE ( WinFNT_Header, first_char ),
FT_FRAME_BYTE ( WinFNT_Header, last_char ),
FT_FRAME_BYTE ( WinFNT_Header, default_char ),
FT_FRAME_BYTE ( WinFNT_Header, break_char ),
FT_FRAME_USHORT_LE( WinFNT_Header, bytes_per_row ),
FT_FRAME_ULONG_LE ( WinFNT_Header, device_offset ),
FT_FRAME_ULONG_LE ( WinFNT_Header, face_name_offset ),
FT_FRAME_ULONG_LE ( WinFNT_Header, bits_pointer ),
FT_FRAME_ULONG_LE ( WinFNT_Header, bits_offset ),
FT_FRAME_BYTE ( WinFNT_Header, reserved ),
FT_FRAME_ULONG_LE ( WinFNT_Header, flags ),
FT_FRAME_USHORT_LE( WinFNT_Header, A_space ),
FT_FRAME_USHORT_LE( WinFNT_Header, B_space ),
FT_FRAME_USHORT_LE( WinFNT_Header, C_space ),
FT_FRAME_USHORT_LE( WinFNT_Header, color_table_offset ),
FT_FRAME_BYTES ( WinFNT_Header, reserved, 4 ),
FT_FRAME_END };
static
void fnt_done_font( FT_Stream stream,
FNT_Font* font )
{
if (font->fnt_frame)
RELEASE_Frame( font->fnt_frame );
font->fnt_size = 0;
font->fnt_frame = 0;
}
static
FT_Error fnt_load_font( FT_Stream stream,
FNT_Font* font )
{
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 = FT_Err_Unknown_File_Format;
goto Exit;
}
if ( header->file_type & 1 )
{
FT_TRACE2(( "can't handle vector FNT fonts\n" ));
error = FT_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_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_done_font( stream, cur );
FREE( face->fonts );
face->num_fonts = 0;
}
static
FT_Error fnt_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;
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;
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 = 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 resource !!\n" ));
error = FT_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_load_font( stream, cur );
if (error) goto Fail;
}
}
}
}
Fail:
if (error)
fnt_done_fonts( face );
Exit:
return error;
}
static
void FNT_Done_Face( FNT_Face face )
{
FT_Memory memory = FT_FACE_MEMORY(face);
fnt_done_fonts(face);
FREE( face->root.available_sizes );
face->root.num_fixed_sizes = 0;
}
static
FT_Error FNT_Init_Face( 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_get_dll_fonts( face );
if (error)
{
/* this didn't work, now try to load a single FNT font */
FT_Memory memory = FT_FACE_MEMORY(face);
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_load_font( stream, font );
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 = "Regular";
if (root->style_flags & FT_STYLE_FLAG_BOLD)
{
if (root->style_flags & FT_STYLE_FLAG_ITALIC)
root->style_name = "Bold Italic";
else
root->style_name = "Bold";
}
else if (root->style_flags & FT_STYLE_FLAG_ITALIC)
root->style_name = "Italic";
}
Fail:
if (error)
FNT_Done_Face( face );
Exit:
return error;
}
static
FT_Error FNT_Set_Pixel_Size( 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;
break;
}
}
return (size->font ? FT_Err_Ok : FT_Err_Invalid_Argument);
}
static
FT_UInt FNT_Get_Char_Index( FT_CharMap charmap,
FT_ULong char_code )
{
FT_UInt result = char_code;
if (charmap)
{
FNT_Font* font = ((FNT_Face)charmap->face)->fonts;
FT_UInt first = font->header.first_char;
FT_UInt count = font->header.last_char - first + 1;
char_code -= first;
if (char_code < count)
result = char_code;
else
result = font->header.default_char - first;
}
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 = FT_Err_Invalid_Argument;
goto Exit;
}
new_format = 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;
Exit:
return error;
}
const FT_Driver_Class winfnt_driver_class =
{
{
ft_module_font_driver,
sizeof( FT_DriverRec ),
"winfonts",
0x10000,
0x20000,
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_Init_Face,
(FTDriver_doneFace) FNT_Done_Face,
(FTDriver_initSize) 0,
(FTDriver_doneSize) 0,
(FTDriver_initGlyphSlot)0,
(FTDriver_doneGlyphSlot)0,
(FTDriver_setCharSizes) FNT_Set_Pixel_Size,
(FTDriver_setPixelSizes)FNT_Set_Pixel_Size,
(FTDriver_loadGlyph) FNT_Load_Glyph,
(FTDriver_getCharIndex) FNT_Get_Char_Index,
(FTDriver_getKerning) 0,
(FTDriver_attachFile) 0,
(FTDriver_getAdvances) 0
};