kc3-lang/freetype/src/sfnt/sfobjs.c
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Hash : f0df85ba
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Date : 2000-06-22T00:17:42
- MAJOR INTERNAL REDESIGN: A lot of internal modifications have been performed lately on the source in order to provide the following enhancements: - more generic module support: The FT_Module type is now defined to represent a handle to a given module. The file <freetype/ftmodule.h> contains the FT_Module_Class definition, as well as the module-loading public API The FT_Driver type is still defined, and still represents a pointer to a font driver. Note that FT_Add_Driver is replaced by FT_Add_Module, FT_Get_Driver by FT_Get_Module, etc.. - support for generic glyph image types: The FT_Renderer type is a pointer to a module used to perform various operations on glyph image. Each renderer is capable of handling images in a single format (e.g. ft_glyph_format_outline). Its functions are used to: - transform an glyph image - render a glyph image into a bitmap - return the control box (dimensions) of a given glyph image The scan converters "ftraster.c" and "ftgrays.c" have been moved to the new directory "src/renderer", and are used to provide two default renderer modules. One corresponds to the "standard" scan-converter, the other to the "smooth" one. The current renderer can be set through the new function FT_Set_Renderer. The old raster-related function FT_Set_Raster, FT_Get_Raster and FT_Set_Raster_Mode have now disappeared, in favor of the new: FT_Get_Renderer FT_Set_Renderer see the file <freetype/ftrender.h> for more details.. These changes were necessary to properly support different scalable formats in the future, like bi-color glyphs, etc.. - glyph loader object: A new internal object, called a 'glyph loader' has been introduced in the base layer. It is used by all scalable format font drivers to load glyphs and composites. This object has been created to reduce the code size of each driver, as each one of them basically re-implemented its functionality. See <freetype/internal/ftobjs.h> and the FT_GlyphLoader type for more information.. - FT_GlyphSlot had new fields: In order to support extended features (see below), the FT_GlyphSlot structure has a few new fields: linearHoriAdvance: this field gives the linearly scaled (i.e. scaled but unhinted) advance width for the glyph, expressed as a 16.16 fixed pixel value. This is useful to perform WYSIWYG text. linearVertAdvance: this field gives the linearly scaled advance height for the glyph (relevant in vertical glyph layouts only). This is useful to perform WYSIWYG text. Note that the two above field replace the removed "metrics2" field in the glyph slot. advance: this field is a vector that gives the transformed advance for the glyph. By default, it corresponds to the advance width, unless FT_LOAD_VERTICAL_LAYOUT was specified when calling FT_Load_Glyph or FT_Load_Char bitmap_left: this field gives the distance in integer pixels from the current pen position to the left-most pixel of a glyph image WHEN IT IS A BITMAP. It is only valid when the "format" field is set to "ft_glyph_format_bitmap", for example, after calling the new function FT_Render_Glyph. bitmap_top: this field gives the distance in integer pixels from the current pen position (located on the baseline) to the top-most pixel of the glyph image WHEN IT IS A BITMAP. Positive values correspond to upwards Y. loader: this is a new private field for the glyph slot. Client applications should not touch it.. - support for transforms and direct rendering in FT_Load_Glyph: Most of the functionality found in <freetype/ftglyph.h> has been moved to the core library. Hence, the following: - a transform can be specified for a face through FT_Set_Transform. this transform is applied by FT_Load_Glyph to scalable glyph images (i.e. NOT TO BITMAPS) before the function returns, unless the bit flag FT_LOAD_IGNORE_TRANSFORM was set in the load flags.. - once a glyph image has been loaded, it can be directly converted to a bitmap by using the new FT_Render_Glyph function. Note that this function takes the glyph image from the glyph slot, and converts it to a bitmap whose properties are returned in "face.glyph.bitmap", "face.glyph.bitmap_left" and "face.glyph.bitmap_top". The original native image might be lost after the conversion. - when using the new bit flag FT_LOAD_RENDER, the FT_Load_Glyph and FT_Load_Char functions will call FT_Render_Glyph automatically when needed.
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src/sfnt/sfobjs.c
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/***************************************************************************/ /* */ /* sfobjs.c */ /* */ /* SFNT object management (base). */ /* */ /* 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 <sfobjs.h> #include <freetype/internal/sfnt.h> #include <freetype/internal/psnames.h> #include <freetype/ttnameid.h> #include <freetype/internal/tterrors.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_sfobjs /*************************************************************************/ /* */ /* <Function> */ /* Get_Name */ /* */ /* <Description> */ /* Returns a given ENGLISH name record in ASCII. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* nameid :: The name id of the name record to return. */ /* */ /* <Return> */ /* Character string. NULL if no name is present. */ /* */ static FT_String* Get_Name( TT_Face face, FT_UShort nameid ) { FT_Memory memory = face->root.memory; FT_UShort n; TT_NameRec* rec; FT_Bool wide_chars = 1; rec = face->name_table.names; for ( n = 0; n < face->name_table.numNameRecords; n++, rec++ ) { if ( rec->nameID == nameid ) { /* found the name - now create an ASCII string from it */ FT_Bool found = 0; /* test for Microsoft English language */ if ( rec->platformID == TT_PLATFORM_MICROSOFT && rec->encodingID <= TT_MS_ID_UNICODE_CS && ( rec->languageID & 0x3FF ) == 0x009 ) found = 1; /* test for Apple Unicode encoding */ else if ( rec->platformID == TT_PLATFORM_APPLE_UNICODE ) found = 1; /* test for Apple Roman */ else if ( rec->platformID == TT_PLATFORM_MACINTOSH && rec->languageID == TT_MAC_ID_ROMAN ) { found = 1; wide_chars = 0; } /* found a Unicode name */ if ( found ) { FT_String* string; FT_UInt len; if ( wide_chars ) { FT_UInt m; len = (FT_UInt)rec->stringLength / 2; if ( MEM_Alloc( string, len + 1 ) ) return NULL; for ( m = 0; m < len; m ++ ) string[m] = rec->string[2 * m + 1]; } else { len = rec->stringLength; if ( MEM_Alloc( string, len + 1 ) ) return NULL; MEM_Copy( string, rec->string, len ); } string[len] = '\0'; return string; } } } return NULL; } static FT_Encoding find_encoding( int platform_id, int encoding_id ) { typedef struct TEncoding { int platform_id; int encoding_id; FT_Encoding encoding; } TEncoding; static const TEncoding tt_encodings[] = { { TT_PLATFORM_ISO, -1, ft_encoding_unicode }, { TT_PLATFORM_APPLE_UNICODE, -1, ft_encoding_unicode }, { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, ft_encoding_apple_roman }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, ft_encoding_unicode }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, ft_encoding_sjis }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, ft_encoding_gb2312 }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, ft_encoding_big5 }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, ft_encoding_wansung }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, ft_encoding_johab } }; const TEncoding *cur, *limit; cur = tt_encodings; limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] ); for ( ; cur < limit; cur++ ) { if ( cur->platform_id == platform_id ) { if ( cur->encoding_id == encoding_id || cur->encoding_id == -1 ) return cur->encoding; } } return ft_encoding_none; } LOCAL_FUNC FT_Error SFNT_Init_Face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_Library library = face->root.driver->root.library; SFNT_Interface* sfnt; SFNT_Header sfnt_header; /* for now, parameters are unused */ UNUSED( num_params ); UNUSED( params ); sfnt = (SFNT_Interface*)face->sfnt; if ( !sfnt ) { sfnt = (SFNT_Interface*)FT_Get_Module_Interface( library, "sfnt" ); if ( !sfnt ) { error = FT_Err_Invalid_File_Format; goto Exit; } face->sfnt = sfnt; face->goto_table = sfnt->goto_table; } if ( !face->psnames ) { face->psnames = (PSNames_Interface*) FT_Get_Module_Interface( library, "psnames" ); } /* check that we have a valid TrueType file */ error = sfnt->load_sfnt_header( face, stream, face_index, &sfnt_header ); if ( error ) goto Exit; face->format_tag = sfnt_header.format_tag; face->num_tables = sfnt_header.num_tables; /* Load font directory */ error = sfnt->load_directory( face, stream, &sfnt_header ); if ( error ) goto Exit; face->root.num_faces = face->ttc_header.DirCount; if ( face->root.num_faces < 1 ) face->root.num_faces = 1; Exit: return error; } #undef LOAD_ #define LOAD_( x ) ( (error = sfnt->load_##x( face, stream )) != TT_Err_Ok ) LOCAL_FUNC FT_Error SFNT_Load_Face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt; /* Load tables */ if ( LOAD_( header ) || LOAD_( max_profile ) || /* load the `hhea' & `hmtx' tables at once */ ( error = sfnt->load_metrics( face, stream, 0 ) ) != TT_Err_Ok || /* try to load the `vhea' & `vmtx' at once if present */ ( error = sfnt->load_metrics( face, stream, 1 ) ) != TT_Err_Ok || LOAD_( charmaps ) || LOAD_( names ) || LOAD_( os2 ) || LOAD_( psnames ) ) goto Exit; /* the optional tables */ #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS /* embedded bitmap support. */ if ( sfnt->load_sbits && LOAD_( sbits ) ) goto Exit; #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ if ( LOAD_( hdmx ) || LOAD_( gasp ) || LOAD_( kerning ) || LOAD_( pclt ) ) goto Exit; #ifdef TT_CONFIG_OPTION_EXTEND_ENGINE if ( ( error = TT_Extension_Create( face ) ) != TT_Err_Ok ) goto Exit; #endif face->root.family_name = Get_Name( face, TT_NAME_ID_FONT_FAMILY ); face->root.style_name = Get_Name( face, TT_NAME_ID_FONT_SUBFAMILY ); /* now set up root fields */ { FT_Face root = &face->root; FT_Int flags; TT_CharMap charmap; FT_Int n; FT_Memory memory; memory = root->memory; /*********************************************************************/ /* */ /* Compute face flags. */ /* */ flags = FT_FACE_FLAG_SCALABLE | /* scalable outlines */ FT_FACE_FLAG_SFNT | /* SFNT file format */ FT_FACE_FLAG_HORIZONTAL; /* horizontal data */ /* fixed width font? */ if ( face->postscript.isFixedPitch ) flags |= FT_FACE_FLAG_FIXED_WIDTH; /* vertical information? */ if ( face->vertical_info ) flags |= FT_FACE_FLAG_VERTICAL; /* kerning available ? */ if ( face->kern_pairs ) flags |= FT_FACE_FLAG_KERNING; root->face_flags = flags; /*********************************************************************/ /* */ /* Compute style flags. */ /* */ flags = 0; if ( face->os2.version != 0xFFFF ) { /* we have an OS/2 table; use the `fsSelection' field */ if ( face->os2.fsSelection & 1 ) flags |= FT_STYLE_FLAG_ITALIC; if ( face->os2.fsSelection & 32 ) flags |= FT_STYLE_FLAG_BOLD; } else { /* this is an old Mac font, use the header field */ if ( face->header.Mac_Style & 1 ) flags |= FT_STYLE_FLAG_BOLD; if ( face->header.Mac_Style & 2 ) flags |= FT_STYLE_FLAG_ITALIC; } face->root.style_flags = flags; /*********************************************************************/ /* */ /* Polish the charmaps. */ /* */ /* Try to set the charmap encoding according to the platform & */ /* encoding ID of each charmap. */ /* */ charmap = face->charmaps; root->num_charmaps = face->num_charmaps; /* allocate table of pointers */ if ( ALLOC_ARRAY( root->charmaps, root->num_charmaps, FT_CharMap ) ) goto Exit; for ( n = 0; n < root->num_charmaps; n++, charmap++ ) { FT_Int platform = charmap->cmap.platformID; FT_Int encoding = charmap->cmap.platformEncodingID; charmap->root.face = (FT_Face)face; charmap->root.platform_id = platform; charmap->root.encoding_id = encoding; charmap->root.encoding = find_encoding( platform, encoding ); /* now, set root->charmap with a unicode charmap */ /* wherever available */ if ( !root->charmap && charmap->root.encoding == ft_encoding_unicode ) root->charmap = (FT_CharMap)charmap; root->charmaps[n] = (FT_CharMap)charmap; } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS if ( face->num_sbit_strikes ) { face->root.num_fixed_sizes = face->num_sbit_strikes; if ( ALLOC_ARRAY( face->root.available_sizes, face->num_sbit_strikes, FT_Bitmap_Size ) ) return error; for ( n = 0 ; n < face->num_sbit_strikes ; n++ ) { face->root.available_sizes[n].width = face->sbit_strikes[n].x_ppem; face->root.available_sizes[n].height = face->sbit_strikes[n].y_ppem; } } else #else /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ { root->num_fixed_sizes = 0; root->available_sizes = 0; } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /*********************************************************************/ /* */ /* Set up metrics. */ /* */ root->bbox.xMin = face->header.xMin; root->bbox.yMin = face->header.yMin; root->bbox.xMax = face->header.xMax; root->bbox.yMax = face->header.yMax; root->units_per_EM = face->header.Units_Per_EM; /* The ascender/descender/height are computed from the OS/2 table */ /* when found. Otherwise, they're taken from the horizontal header. */ if ( face->os2.version != 0xFFFF ) { root->ascender = face->os2.sTypoAscender; root->descender = -face->os2.sTypoDescender; root->height = root->ascender + root->descender + face->os2.sTypoLineGap; } else { root->ascender = face->horizontal.Ascender; root->descender = face->horizontal.Descender; root->height = root->ascender + root->descender + face->horizontal.Line_Gap; } root->max_advance_width = face->horizontal.advance_Width_Max; root->max_advance_height = face->vertical_info ? face->vertical.advance_Height_Max : root->height; root->underline_position = face->postscript.underlinePosition; root->underline_thickness = face->postscript.underlineThickness; /* root->max_points - already set up */ /* root->max_contours - already set up */ } Exit: return error; } #undef LOAD_ LOCAL_FUNC void SFNT_Done_Face( TT_Face face ) { FT_Memory memory = face->root.memory; SFNT_Interface* sfnt = face->sfnt; if ( sfnt ) { /* destroy the postscript names table if it is loaded */ if ( sfnt->free_psnames ) sfnt->free_psnames( face ); /* destroy the embedded bitmaps table if it is loaded */ if ( sfnt->free_sbits ) sfnt->free_sbits( face ); } /* freeing the kerning table */ FREE( face->kern_pairs ); face->num_kern_pairs = 0; /* freeing the collection table */ FREE( face->ttc_header.TableDirectory ); face->ttc_header.DirCount = 0; /* freeing table directory */ FREE( face->dir_tables ); face->num_tables = 0; /* freeing the character mapping tables */ if (sfnt && sfnt->load_charmaps ) { FT_UShort n; for ( n = 0; n < face->num_charmaps; n++ ) sfnt->free_charmap( face, &face->charmaps[n].cmap ); } FREE( face->charmaps ); face->num_charmaps = 0; FREE( face->root.charmaps ); face->root.num_charmaps = 0; face->root.charmap = 0; /* freeing the horizontal metrics */ FREE( face->horizontal.long_metrics ); FREE( face->horizontal.short_metrics ); /* freeing the vertical ones, if any */ if ( face->vertical_info ) { FREE( face->vertical.long_metrics ); FREE( face->vertical.short_metrics ); face->vertical_info = 0; } /* freeing the gasp table */ FREE( face->gasp.gaspRanges ); face->gasp.numRanges = 0; /* freeing the name table */ sfnt->free_names( face ); /* freeing the hdmx table */ sfnt->free_hdmx( face ); /* freeing family and style name */ FREE( face->root.family_name ); FREE( face->root.style_name ); /* freeing sbit size table */ face->root.num_fixed_sizes = 0; if ( face->root.available_sizes ) FREE( face->root.available_sizes ); face->sfnt = 0; } /* END */