ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /libfreetype/winfnt.c/
/***************************************************************************/ /* */ /* winfnt.c */ /* */ /* FreeType font driver for Windows FNT/FON files */ /* */ /* Copyright 1996-2001, 2002 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_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 WinFNT_HeaderRec 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 ) FT_FRAME_RELEASE( 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 ( 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; } 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 ( FT_STREAM_SEEK( font->offset ) || FT_FRAME_EXTRACT( 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 ); FT_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_HeaderRec mz_header; face->fonts = 0; face->num_fonts = 0; /* does it begin with a 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 a 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 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 ( 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 == 0x8008 ) { 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; } if ( FT_STREAM_SEEK( font_offset ) || FT_NEW_ARRAY( face->fonts, font_count ) ) goto Exit; face->num_fonts = font_count; if ( FT_FRAME_ENTER( (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)FT_GET_USHORT_LE() << size_shift; cur->fnt_size = (FT_ULong)FT_GET_USHORT_LE() << size_shift; cur->size_shift = size_shift; stream->cursor += 8; } } FT_FRAME_EXIT(); /* 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; } 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->fonts; 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; 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_face_done_fonts( 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 ); 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 ( FT_NEW( 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 ( FT_NEW_ARRAY( root->available_sizes, face->num_fonts ) ) 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; } } { 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 */ 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_Error FNT_Load_Glyph( FT_GlyphSlot slot, FNT_Size size, FT_UInt glyph_index, FT_Int32 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 = 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; 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[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_ClassRec 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 ), (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 */