forked from minhngoc25a/freetype2
574 lines
17 KiB
C
574 lines
17 KiB
C
/***************************************************************************/
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/* */
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/* winfnt.c */
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/* */
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/* FreeType font driver for Windows FNT/FON files */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used */
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/* modified and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifdef FT_FLAT_COMPILE
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#include "winfnt.h"
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#else
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#include <winfonts/winfnt.h>
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#endif
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#include <freetype/fterrors.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftobjs.h>
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttobjs
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static const FT_Frame_Field winmz_header_fields[] =
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{ FT_FRAME_START( 64 ),
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FT_FRAME_USHORT_LE ( WinMZ_Header, magic ),
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FT_FRAME_SKIP_BYTES( 29*2 ),
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FT_FRAME_ULONG_LE ( WinMZ_Header, lfanew ),
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FT_FRAME_END };
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static const FT_Frame_Field winne_header_fields[] =
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{ FT_FRAME_START( 40 ),
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FT_FRAME_USHORT_LE( WinNE_Header, magic ),
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FT_FRAME_SKIP_BYTES( 34 ),
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FT_FRAME_USHORT_LE( WinNE_Header, resource_tab_offset ),
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FT_FRAME_USHORT_LE( WinNE_Header, rname_tab_offset ),
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FT_FRAME_END };
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static const FT_Frame_Field winfnt_header_fields[] =
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{ FT_FRAME_START( 134 ),
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FT_FRAME_USHORT_LE( WinFNT_Header, version ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, file_size ),
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FT_FRAME_BYTES ( WinFNT_Header, copyright, 60 ),
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FT_FRAME_USHORT_LE( WinFNT_Header, file_type ),
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FT_FRAME_USHORT_LE( WinFNT_Header, nominal_point_size ),
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FT_FRAME_USHORT_LE( WinFNT_Header, vertical_resolution ),
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FT_FRAME_USHORT_LE( WinFNT_Header, horizontal_resolution ),
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FT_FRAME_USHORT_LE( WinFNT_Header, ascent ),
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FT_FRAME_USHORT_LE( WinFNT_Header, internal_leading ),
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FT_FRAME_USHORT_LE( WinFNT_Header, external_leading ),
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FT_FRAME_BYTE ( WinFNT_Header, italic ),
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FT_FRAME_BYTE ( WinFNT_Header, underline ),
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FT_FRAME_BYTE ( WinFNT_Header, strike_out ),
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FT_FRAME_USHORT_LE( WinFNT_Header, weight ),
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FT_FRAME_BYTE ( WinFNT_Header, charset ),
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FT_FRAME_USHORT_LE( WinFNT_Header, pixel_width ),
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FT_FRAME_USHORT_LE( WinFNT_Header, pixel_height ),
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FT_FRAME_BYTE ( WinFNT_Header, pitch_and_family ),
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FT_FRAME_USHORT_LE( WinFNT_Header, avg_width ),
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FT_FRAME_USHORT_LE( WinFNT_Header, max_width ),
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FT_FRAME_BYTE ( WinFNT_Header, first_char ),
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FT_FRAME_BYTE ( WinFNT_Header, last_char ),
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FT_FRAME_BYTE ( WinFNT_Header, default_char ),
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FT_FRAME_BYTE ( WinFNT_Header, break_char ),
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FT_FRAME_USHORT_LE( WinFNT_Header, bytes_per_row ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, device_offset ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, face_name_offset ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, bits_pointer ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, bits_offset ),
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FT_FRAME_BYTE ( WinFNT_Header, reserved ),
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FT_FRAME_ULONG_LE ( WinFNT_Header, flags ),
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FT_FRAME_USHORT_LE( WinFNT_Header, A_space ),
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FT_FRAME_USHORT_LE( WinFNT_Header, B_space ),
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FT_FRAME_USHORT_LE( WinFNT_Header, C_space ),
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FT_FRAME_USHORT_LE( WinFNT_Header, color_table_offset ),
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FT_FRAME_BYTES ( WinFNT_Header, reserved, 4 ),
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FT_FRAME_END };
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static
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void fnt_done_font( FT_Stream stream,
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FNT_Font* font )
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{
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if (font->fnt_frame)
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RELEASE_Frame( font->fnt_frame );
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font->fnt_size = 0;
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font->fnt_frame = 0;
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}
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static
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FT_Error fnt_load_font( FT_Stream stream,
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FNT_Font* font )
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{
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FT_Error error;
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WinFNT_Header* header = &font->header;
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/* first of all, read the FNT header */
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if ( FILE_Seek ( font->offset ) ||
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READ_Fields( winfnt_header_fields, header ) )
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goto Exit;
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/* check header */
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if ( header->version != 0x200 &&
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header->version != 0x300 )
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{
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FT_TRACE2(( "not a valid FNT file\n" ));
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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if ( header->file_type & 1 )
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{
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FT_TRACE2(( "can't handle vector FNT fonts\n" ));
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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/* small fixup. some fonts have the "pixel_width" field set to 0 */
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if ( header->pixel_width == 0 )
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header->pixel_width = header->pixel_height;
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/* this is a FNT file/table, we now extract its frame */
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if ( FILE_Seek( font->offset ) ||
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EXTRACT_Frame( header->file_size, font->fnt_frame ) )
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goto Exit;
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Exit:
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return error;
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}
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static
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void fnt_done_fonts( FNT_Face face )
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{
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FT_Memory memory = FT_FACE(face)->memory;
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FT_Stream stream = FT_FACE(face)->stream;
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FNT_Font* cur = face->fonts;
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FNT_Font* limit = cur + face->num_fonts;
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for ( ; cur < limit; cur++ )
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fnt_done_font( stream, cur );
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FREE( face->fonts );
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face->num_fonts = 0;
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}
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static
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FT_Error fnt_get_dll_fonts( FNT_Face face )
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{
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FT_Error error;
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FT_Stream stream = FT_FACE(face)->stream;
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FT_Memory memory = FT_FACE(face)->memory;
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WinMZ_Header mz_header;
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face->fonts = 0;
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face->num_fonts = 0;
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/* does it begin with a MZ header ?? */
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if ( FILE_Seek( 0 ) ||
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READ_Fields( winmz_header_fields, &mz_header ) )
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goto Exit;
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error = FT_Err_Unknown_File_Format;
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if ( mz_header.magic == WINFNT_MZ_MAGIC )
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{
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/* yes, now look for a NE header in the file */
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WinNE_Header ne_header;
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if ( FILE_Seek( mz_header.lfanew ) ||
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READ_Fields( winne_header_fields, &ne_header ) )
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goto Exit;
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error = FT_Err_Unknown_File_Format;
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if ( ne_header.magic == WINFNT_NE_MAGIC )
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{
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/* good, now look in the resource table for each FNT resource */
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FT_ULong res_offset = mz_header.lfanew + ne_header.resource_tab_offset;
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FT_UShort size_shift;
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FT_UShort font_count = 0;
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FT_ULong font_offset = 0;
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if ( FILE_Seek( res_offset ) ||
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ACCESS_Frame( ne_header.rname_tab_offset -
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ne_header.resource_tab_offset ) )
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goto Exit;
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size_shift = GET_UShortLE();
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for (;;)
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{
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FT_UShort type_id, count;
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type_id = GET_UShortLE();
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if (!type_id)
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break;
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count = GET_UShortLE();
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if (type_id == 0x8008)
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{
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font_count = count;
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font_offset = FILE_Pos() + 4 + (stream->cursor - stream->limit);
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break;
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}
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stream->cursor += 4 + count*12;
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}
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FORGET_Frame();
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if ( !font_count || !font_offset )
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{
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FT_TRACE2(( "This file doesn't contain any FNT resource !!\n" ));
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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if ( FILE_Seek( font_offset ) ||
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ALLOC_ARRAY( face->fonts, font_count, FNT_Font ) )
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goto Exit;
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face->num_fonts = font_count;
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if ( ACCESS_Frame( (FT_Long)font_count * 12 ) )
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goto Exit;
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/* now read the offset and position of each FNT font */
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{
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FNT_Font* cur = face->fonts;
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FNT_Font* limit = cur + font_count;
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for ( ; cur < limit; cur++ )
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{
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cur->offset = (FT_ULong)GET_UShortLE() << size_shift;
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cur->fnt_size = (FT_ULong)GET_UShortLE() << size_shift;
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cur->size_shift = size_shift;
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stream->cursor += 8;
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}
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}
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FORGET_Frame();
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/* finally, try to load each font there */
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{
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FNT_Font* cur = face->fonts;
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FNT_Font* limit = cur + font_count;
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for ( ; cur < limit; cur++ )
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{
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error = fnt_load_font( stream, cur );
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if (error) goto Fail;
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}
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}
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}
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}
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Fail:
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if (error)
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fnt_done_fonts( face );
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Exit:
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return error;
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}
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static
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void FNT_Done_Face( FNT_Face face )
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{
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FT_Memory memory = FT_FACE_MEMORY(face);
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fnt_done_fonts(face);
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FREE( face->root.available_sizes );
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face->root.num_fixed_sizes = 0;
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}
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static
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FT_Error FNT_Init_Face( FT_Stream stream,
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FNT_Face face,
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params )
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{
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FT_Error error;
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FT_Memory memory = FT_FACE_MEMORY(face);
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FT_UNUSED(num_params);
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FT_UNUSED(params);
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FT_UNUSED(face_index);
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/* try to load several fonts from a DLL */
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error = fnt_get_dll_fonts( face );
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if (error)
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{
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/* this didn't work, now try to load a single FNT font */
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FT_Memory memory = FT_FACE_MEMORY(face);
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FNT_Font* font;
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if ( ALLOC( face->fonts, sizeof(*face->fonts) ) )
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goto Exit;
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face->num_fonts = 1;
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font = face->fonts;
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font->offset = 0;
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font->fnt_size = stream->size;
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error = fnt_load_font( stream, font );
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if (error)
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goto Fail;
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}
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/* all right, one or more fonts were loaded, we now need to */
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/* fill the root FT_Face fields with relevant information.. */
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{
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FT_Face root = FT_FACE(face);
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FNT_Font* fonts = face->fonts;
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FNT_Font* limit = fonts + face->num_fonts;
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FNT_Font* cur;
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root->num_faces = 1;
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root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
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FT_FACE_FLAG_HORIZONTAL;
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if ( fonts->header.avg_width == fonts->header.max_width )
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root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
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if ( fonts->header.italic )
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root->style_flags |= FT_STYLE_FLAG_ITALIC;
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if ( fonts->header.weight >= 800 )
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root->style_flags |= FT_STYLE_FLAG_BOLD;
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/* Setup the "fixed_sizes" array */
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if ( ALLOC_ARRAY( root->available_sizes, face->num_fonts, FT_Bitmap_Size ) )
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goto Fail;
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root->num_fixed_sizes = face->num_fonts;
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{
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FT_Bitmap_Size* size = root->available_sizes;
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for ( cur = fonts; cur < limit; cur++, size++ )
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{
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size->width = cur->header.pixel_width;
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size->height = cur->header.pixel_height;
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}
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}
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/* Setup the "charmaps" array */
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root->charmaps = &face->charmap_handle;
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root->num_charmaps = 1;
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face->charmap.encoding = ft_encoding_unicode;
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face->charmap.platform_id = 3;
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face->charmap.encoding_id = 1;
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face->charmap.face = root;
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face->charmap_handle = &face->charmap;
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root->charmap = face->charmap_handle;
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/* setup remaining flags */
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root->num_glyphs = fonts->header.last_char - fonts->header.first_char + 1;
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root->family_name = (FT_String*)fonts->fnt_frame + fonts->header.face_name_offset;
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root->style_name = "Regular";
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if (root->style_flags & FT_STYLE_FLAG_BOLD)
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{
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if (root->style_flags & FT_STYLE_FLAG_ITALIC)
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root->style_name = "Bold Italic";
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else
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root->style_name = "Bold";
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}
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else if (root->style_flags & FT_STYLE_FLAG_ITALIC)
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root->style_name = "Italic";
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}
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Fail:
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if (error)
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FNT_Done_Face( face );
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Exit:
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return error;
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}
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static
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FT_Error FNT_Set_Pixel_Size( FNT_Size size )
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{
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/* look up a font corresponding to the current pixel size */
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FNT_Face face = (FNT_Face)FT_SIZE_FACE(size);
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FNT_Font* cur = face->fonts;
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FNT_Font* limit = cur + face->num_fonts;
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size->font = 0;
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for ( ; cur < limit; cur++ )
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{
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/* we only compare the character height, as fonts used some strange */
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/* values.. */
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if ( cur->header.pixel_height == size->root.metrics.y_ppem )
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{
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size->font = cur;
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break;
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}
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}
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return (size->font ? FT_Err_Ok : FT_Err_Invalid_Argument);
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}
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static
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FT_UInt FNT_Get_Char_Index( FT_CharMap charmap,
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FT_ULong char_code )
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{
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FT_UInt result = char_code;
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if (charmap)
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{
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FNT_Font* font = ((FNT_Face)charmap->face)->fonts;
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FT_UInt first = font->header.first_char;
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FT_UInt count = font->header.last_char - first + 1;
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char_code -= first;
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if (char_code < count)
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result = char_code;
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else
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result = font->header.default_char - first;
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}
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return result;
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}
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static
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FT_Error FNT_Load_Glyph( FT_GlyphSlot slot,
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FNT_Size size,
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FT_UInt glyph_index,
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FT_Int load_flags )
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{
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FNT_Font* font = size->font;
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FT_Error error = 0;
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FT_Byte* p;
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FT_Int len;
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FT_Bitmap* bitmap = &slot->bitmap;
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FT_ULong offset;
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FT_Bool new_format;
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FT_UNUSED(slot);
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FT_UNUSED(load_flags);
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if (!font)
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{
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error = FT_Err_Invalid_Argument;
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goto Exit;
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}
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new_format = font->header.version == 0x300;
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len = new_format ? 6 : 4;
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/* jump to glyph entry */
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p = font->fnt_frame + 118 + len*glyph_index;
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bitmap->width = NEXT_ShortLE(p);
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if (new_format)
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offset = NEXT_ULongLE(p);
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else
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offset = NEXT_UShortLE(p);
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/* jump to glyph data */
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p = font->fnt_frame + /* font->header.bits_offset */ + offset;
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/* allocate and build bitmap */
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{
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FT_Memory memory = FT_FACE_MEMORY(slot->face);
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FT_Int pitch = (bitmap->width+7) >> 3;
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FT_Byte* column;
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FT_Byte* write;
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bitmap->pitch = pitch;
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bitmap->rows = font->header.pixel_height;
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bitmap->pixel_mode = ft_pixel_mode_mono;
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if ( ALLOC( bitmap->buffer, pitch * bitmap->rows ) )
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goto Exit;
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column = (FT_Byte*)bitmap->buffer;
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for ( ; pitch > 0; pitch--, column++ )
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{
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FT_Byte* limit = p + bitmap->rows;
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for ( write = column; p < limit; p++, write += bitmap->pitch )
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write[0] = p[0];
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}
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}
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slot->flags = ft_glyph_own_bitmap;
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slot->bitmap_left = 0;
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slot->bitmap_top = font->header.ascent;
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slot->format = ft_glyph_format_bitmap;
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/* now set up metrics */
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slot->metrics.horiAdvance = bitmap->width << 6;
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slot->metrics.horiBearingX = 0;
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slot->metrics.horiBearingY = slot->bitmap_top << 6;
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slot->linearHoriAdvance = (FT_Fixed)bitmap->width << 16;
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Exit:
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return error;
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}
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const FT_Driver_Class winfnt_driver_class =
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{
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{
|
|
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
|
|
};
|
|
|