| /***************************************************************************/ |
| /* */ |
| /* sfnt.h */ |
| /* */ |
| /* High-level `sfnt' driver interface (specification). */ |
| /* */ |
| /* Copyright 1996-2015 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. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| #ifndef __SFNT_H__ |
| #define __SFNT_H__ |
| |
| |
| #include <ft2build.h> |
| #include FT_INTERNAL_DRIVER_H |
| #include FT_INTERNAL_TRUETYPE_TYPES_H |
| |
| |
| FT_BEGIN_HEADER |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Init_Face_Func */ |
| /* */ |
| /* <Description> */ |
| /* First part of the SFNT face object initialization. This finds */ |
| /* the face in a SFNT file or collection, and load its format tag in */ |
| /* face->format_tag. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* face_index :: The index of the TrueType font, if we are opening a */ |
| /* collection. */ |
| /* */ |
| /* num_params :: The number of additional parameters. */ |
| /* */ |
| /* params :: Optional additional parameters. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <Note> */ |
| /* The stream cursor must be at the font file's origin. */ |
| /* */ |
| /* This function recognizes fonts embedded in a `TrueType */ |
| /* collection'. */ |
| /* */ |
| /* Once the format tag has been validated by the font driver, it */ |
| /* should then call the TT_Load_Face_Func() callback to read the rest */ |
| /* of the SFNT tables in the object. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Init_Face_Func)( FT_Stream stream, |
| TT_Face face, |
| FT_Int face_index, |
| FT_Int num_params, |
| FT_Parameter* params ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_Face_Func */ |
| /* */ |
| /* <Description> */ |
| /* Second part of the SFNT face object initialization. This loads */ |
| /* the common SFNT tables (head, OS/2, maxp, metrics, etc.) in the */ |
| /* face object. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* face_index :: The index of the TrueType font, if we are opening a */ |
| /* collection. */ |
| /* */ |
| /* num_params :: The number of additional parameters. */ |
| /* */ |
| /* params :: Optional additional parameters. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <Note> */ |
| /* This function must be called after TT_Init_Face_Func(). */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_Face_Func)( FT_Stream stream, |
| TT_Face face, |
| FT_Int face_index, |
| FT_Int num_params, |
| FT_Parameter* params ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Done_Face_Func */ |
| /* */ |
| /* <Description> */ |
| /* A callback used to delete the common SFNT data from a face. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* <Note> */ |
| /* This function does NOT destroy the face object. */ |
| /* */ |
| typedef void |
| (*TT_Done_Face_Func)( TT_Face face ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_Any_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load any font table into client memory. */ |
| /* */ |
| /* <Input> */ |
| /* face :: The face object to look for. */ |
| /* */ |
| /* tag :: The tag of table to load. Use the value 0 if you want */ |
| /* to access the whole font file, else set this parameter */ |
| /* to a valid TrueType table tag that you can forge with */ |
| /* the MAKE_TT_TAG macro. */ |
| /* */ |
| /* offset :: The starting offset in the table (or the file if */ |
| /* tag == 0). */ |
| /* */ |
| /* length :: The address of the decision variable: */ |
| /* */ |
| /* If length == NULL: */ |
| /* Loads the whole table. Returns an error if */ |
| /* `offset' == 0! */ |
| /* */ |
| /* If *length == 0: */ |
| /* Exits immediately; returning the length of the given */ |
| /* table or of the font file, depending on the value of */ |
| /* `tag'. */ |
| /* */ |
| /* If *length != 0: */ |
| /* Loads the next `length' bytes of table or font, */ |
| /* starting at offset `offset' (in table or font too). */ |
| /* */ |
| /* <Output> */ |
| /* buffer :: The address of target buffer. */ |
| /* */ |
| /* <Return> */ |
| /* TrueType error code. 0 means success. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_Any_Func)( TT_Face face, |
| FT_ULong tag, |
| FT_Long offset, |
| FT_Byte *buffer, |
| FT_ULong* length ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Find_SBit_Image_Func */ |
| /* */ |
| /* <Description> */ |
| /* Check whether an embedded bitmap (an `sbit') exists for a given */ |
| /* glyph, at a given strike. */ |
| /* */ |
| /* <Input> */ |
| /* face :: The target face object. */ |
| /* */ |
| /* glyph_index :: The glyph index. */ |
| /* */ |
| /* strike_index :: The current strike index. */ |
| /* */ |
| /* <Output> */ |
| /* arange :: The SBit range containing the glyph index. */ |
| /* */ |
| /* astrike :: The SBit strike containing the glyph index. */ |
| /* */ |
| /* aglyph_offset :: The offset of the glyph data in `EBDT' table. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. Returns */ |
| /* SFNT_Err_Invalid_Argument if no sbit exists for the requested */ |
| /* glyph. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Find_SBit_Image_Func)( TT_Face face, |
| FT_UInt glyph_index, |
| FT_ULong strike_index, |
| TT_SBit_Range *arange, |
| TT_SBit_Strike *astrike, |
| FT_ULong *aglyph_offset ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_SBit_Metrics_Func */ |
| /* */ |
| /* <Description> */ |
| /* Get the big metrics for a given embedded bitmap. */ |
| /* */ |
| /* <Input> */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* range :: The SBit range containing the glyph. */ |
| /* */ |
| /* <Output> */ |
| /* big_metrics :: A big SBit metrics structure for the glyph. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <Note> */ |
| /* The stream cursor must be positioned at the glyph's offset within */ |
| /* the `EBDT' table before the call. */ |
| /* */ |
| /* If the image format uses variable metrics, the stream cursor is */ |
| /* positioned just after the metrics header in the `EBDT' table on */ |
| /* function exit. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_SBit_Metrics_Func)( FT_Stream stream, |
| TT_SBit_Range range, |
| TT_SBit_Metrics metrics ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_SBit_Image_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load a given glyph sbit image from the font resource. This also */ |
| /* returns its metrics. */ |
| /* */ |
| /* <Input> */ |
| /* face :: */ |
| /* The target face object. */ |
| /* */ |
| /* strike_index :: */ |
| /* The strike index. */ |
| /* */ |
| /* glyph_index :: */ |
| /* The current glyph index. */ |
| /* */ |
| /* load_flags :: */ |
| /* The current load flags. */ |
| /* */ |
| /* stream :: */ |
| /* The input stream. */ |
| /* */ |
| /* <Output> */ |
| /* amap :: */ |
| /* The target pixmap. */ |
| /* */ |
| /* ametrics :: */ |
| /* A big sbit metrics structure for the glyph image. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. Returns an error if no */ |
| /* glyph sbit exists for the index. */ |
| /* */ |
| /* <Note> */ |
| /* The `map.buffer' field is always freed before the glyph is loaded. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_SBit_Image_Func)( TT_Face face, |
| FT_ULong strike_index, |
| FT_UInt glyph_index, |
| FT_UInt load_flags, |
| FT_Stream stream, |
| FT_Bitmap *amap, |
| TT_SBit_MetricsRec *ametrics ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Set_SBit_Strike_Func */ |
| /* */ |
| /* <Description> */ |
| /* Select an sbit strike for a given size request. */ |
| /* */ |
| /* <Input> */ |
| /* face :: The target face object. */ |
| /* */ |
| /* req :: The size request. */ |
| /* */ |
| /* <Output> */ |
| /* astrike_index :: The index of the sbit strike. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. Returns an error if no */ |
| /* sbit strike exists for the selected ppem values. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Set_SBit_Strike_Func)( TT_Face face, |
| FT_Size_Request req, |
| FT_ULong* astrike_index ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_Strike_Metrics_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load the metrics of a given strike. */ |
| /* */ |
| /* <Input> */ |
| /* face :: The target face object. */ |
| /* */ |
| /* strike_index :: The strike index. */ |
| /* */ |
| /* <Output> */ |
| /* metrics :: the metrics of the strike. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. Returns an error if no */ |
| /* such sbit strike exists. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_Strike_Metrics_Func)( TT_Face face, |
| FT_ULong strike_index, |
| FT_Size_Metrics* metrics ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Get_PS_Name_Func */ |
| /* */ |
| /* <Description> */ |
| /* Get the PostScript glyph name of a glyph. */ |
| /* */ |
| /* <Input> */ |
| /* idx :: The glyph index. */ |
| /* */ |
| /* PSname :: The address of a string pointer. Will be NULL in case */ |
| /* of error, otherwise it is a pointer to the glyph name. */ |
| /* */ |
| /* You must not modify the returned string! */ |
| /* */ |
| /* <Output> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Get_PS_Name_Func)( TT_Face face, |
| FT_UInt idx, |
| FT_String** PSname ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_Metrics_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load a metrics table, which is a table with a horizontal and a */ |
| /* vertical version. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* vertical :: A boolean flag. If set, load the vertical one. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_Metrics_Func)( TT_Face face, |
| FT_Stream stream, |
| FT_Bool vertical ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Get_Metrics_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load the horizontal or vertical header in a face object. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* vertical :: A boolean flag. If set, load vertical metrics. */ |
| /* */ |
| /* gindex :: The glyph index. */ |
| /* */ |
| /* <Output> */ |
| /* abearing :: The horizontal (or vertical) bearing. Set to zero in */ |
| /* case of error. */ |
| /* */ |
| /* aadvance :: The horizontal (or vertical) advance. Set to zero in */ |
| /* case of error. */ |
| /* */ |
| typedef void |
| (*TT_Get_Metrics_Func)( TT_Face face, |
| FT_Bool vertical, |
| FT_UInt gindex, |
| FT_Short* abearing, |
| FT_UShort* aadvance ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Load_Table_Func */ |
| /* */ |
| /* <Description> */ |
| /* Load a given TrueType table. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| /* stream :: The input stream. */ |
| /* */ |
| /* <Return> */ |
| /* FreeType error code. 0 means success. */ |
| /* */ |
| /* <Note> */ |
| /* The function uses `face->goto_table' to seek the stream to the */ |
| /* start of the table, except while loading the font directory. */ |
| /* */ |
| typedef FT_Error |
| (*TT_Load_Table_Func)( TT_Face face, |
| FT_Stream stream ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* TT_Free_Table_Func */ |
| /* */ |
| /* <Description> */ |
| /* Free a given TrueType table. */ |
| /* */ |
| /* <Input> */ |
| /* face :: A handle to the target face object. */ |
| /* */ |
| typedef void |
| (*TT_Free_Table_Func)( TT_Face face ); |
| |
| |
| /* |
| * @functype: |
| * TT_Face_GetKerningFunc |
| * |
| * @description: |
| * Return the horizontal kerning value between two glyphs. |
| * |
| * @input: |
| * face :: A handle to the source face object. |
| * left_glyph :: The left glyph index. |
| * right_glyph :: The right glyph index. |
| * |
| * @return: |
| * The kerning value in font units. |
| */ |
| typedef FT_Int |
| (*TT_Face_GetKerningFunc)( TT_Face face, |
| FT_UInt left_glyph, |
| FT_UInt right_glyph ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Struct> */ |
| /* SFNT_Interface */ |
| /* */ |
| /* <Description> */ |
| /* This structure holds pointers to the functions used to load and */ |
| /* free the basic tables that are required in a `sfnt' font file. */ |
| /* */ |
| /* <Fields> */ |
| /* Check the various xxx_Func() descriptions for details. */ |
| /* */ |
| typedef struct SFNT_Interface_ |
| { |
| TT_Loader_GotoTableFunc goto_table; |
| |
| TT_Init_Face_Func init_face; |
| TT_Load_Face_Func load_face; |
| TT_Done_Face_Func done_face; |
| FT_Module_Requester get_interface; |
| |
| TT_Load_Any_Func load_any; |
| |
| /* these functions are called by `load_face' but they can also */ |
| /* be called from external modules, if there is a need to do so */ |
| TT_Load_Table_Func load_head; |
| TT_Load_Metrics_Func load_hhea; |
| TT_Load_Table_Func load_cmap; |
| TT_Load_Table_Func load_maxp; |
| TT_Load_Table_Func load_os2; |
| TT_Load_Table_Func load_post; |
| |
| TT_Load_Table_Func load_name; |
| TT_Free_Table_Func free_name; |
| |
| /* this field was called `load_kerning' up to version 2.1.10 */ |
| TT_Load_Table_Func load_kern; |
| |
| TT_Load_Table_Func load_gasp; |
| TT_Load_Table_Func load_pclt; |
| |
| /* see `ttload.h'; this field was called `load_bitmap_header' up to */ |
| /* version 2.1.10 */ |
| TT_Load_Table_Func load_bhed; |
| |
| TT_Load_SBit_Image_Func load_sbit_image; |
| |
| /* see `ttpost.h' */ |
| TT_Get_PS_Name_Func get_psname; |
| TT_Free_Table_Func free_psnames; |
| |
| /* starting here, the structure differs from version 2.1.7 */ |
| |
| /* this field was introduced in version 2.1.8, named `get_psname' */ |
| TT_Face_GetKerningFunc get_kerning; |
| |
| /* new elements introduced after version 2.1.10 */ |
| |
| /* load the font directory, i.e., the offset table and */ |
| /* the table directory */ |
| TT_Load_Table_Func load_font_dir; |
| TT_Load_Metrics_Func load_hmtx; |
| |
| TT_Load_Table_Func load_eblc; |
| TT_Free_Table_Func free_eblc; |
| |
| TT_Set_SBit_Strike_Func set_sbit_strike; |
| TT_Load_Strike_Metrics_Func load_strike_metrics; |
| |
| TT_Get_Metrics_Func get_metrics; |
| |
| } SFNT_Interface; |
| |
| |
| /* transitional */ |
| typedef SFNT_Interface* SFNT_Service; |
| |
| #ifndef FT_CONFIG_OPTION_PIC |
| |
| #define FT_DEFINE_SFNT_INTERFACE( \ |
| class_, \ |
| goto_table_, \ |
| init_face_, \ |
| load_face_, \ |
| done_face_, \ |
| get_interface_, \ |
| load_any_, \ |
| load_head_, \ |
| load_hhea_, \ |
| load_cmap_, \ |
| load_maxp_, \ |
| load_os2_, \ |
| load_post_, \ |
| load_name_, \ |
| free_name_, \ |
| load_kern_, \ |
| load_gasp_, \ |
| load_pclt_, \ |
| load_bhed_, \ |
| load_sbit_image_, \ |
| get_psname_, \ |
| free_psnames_, \ |
| get_kerning_, \ |
| load_font_dir_, \ |
| load_hmtx_, \ |
| load_eblc_, \ |
| free_eblc_, \ |
| set_sbit_strike_, \ |
| load_strike_metrics_, \ |
| get_metrics_ ) \ |
| static const SFNT_Interface class_ = \ |
| { \ |
| goto_table_, \ |
| init_face_, \ |
| load_face_, \ |
| done_face_, \ |
| get_interface_, \ |
| load_any_, \ |
| load_head_, \ |
| load_hhea_, \ |
| load_cmap_, \ |
| load_maxp_, \ |
| load_os2_, \ |
| load_post_, \ |
| load_name_, \ |
| free_name_, \ |
| load_kern_, \ |
| load_gasp_, \ |
| load_pclt_, \ |
| load_bhed_, \ |
| load_sbit_image_, \ |
| get_psname_, \ |
| free_psnames_, \ |
| get_kerning_, \ |
| load_font_dir_, \ |
| load_hmtx_, \ |
| load_eblc_, \ |
| free_eblc_, \ |
| set_sbit_strike_, \ |
| load_strike_metrics_, \ |
| get_metrics_, \ |
| }; |
| |
| #else /* FT_CONFIG_OPTION_PIC */ |
| |
| #define FT_INTERNAL( a, a_ ) \ |
| clazz->a = a_; |
| |
| #define FT_DEFINE_SFNT_INTERFACE( \ |
| class_, \ |
| goto_table_, \ |
| init_face_, \ |
| load_face_, \ |
| done_face_, \ |
| get_interface_, \ |
| load_any_, \ |
| load_head_, \ |
| load_hhea_, \ |
| load_cmap_, \ |
| load_maxp_, \ |
| load_os2_, \ |
| load_post_, \ |
| load_name_, \ |
| free_name_, \ |
| load_kern_, \ |
| load_gasp_, \ |
| load_pclt_, \ |
| load_bhed_, \ |
| load_sbit_image_, \ |
| get_psname_, \ |
| free_psnames_, \ |
| get_kerning_, \ |
| load_font_dir_, \ |
| load_hmtx_, \ |
| load_eblc_, \ |
| free_eblc_, \ |
| set_sbit_strike_, \ |
| load_strike_metrics_, \ |
| get_metrics_ ) \ |
| void \ |
| FT_Init_Class_ ## class_( FT_Library library, \ |
| SFNT_Interface* clazz ) \ |
| { \ |
| FT_UNUSED( library ); \ |
| \ |
| clazz->goto_table = goto_table_; \ |
| clazz->init_face = init_face_; \ |
| clazz->load_face = load_face_; \ |
| clazz->done_face = done_face_; \ |
| clazz->get_interface = get_interface_; \ |
| clazz->load_any = load_any_; \ |
| clazz->load_head = load_head_; \ |
| clazz->load_hhea = load_hhea_; \ |
| clazz->load_cmap = load_cmap_; \ |
| clazz->load_maxp = load_maxp_; \ |
| clazz->load_os2 = load_os2_; \ |
| clazz->load_post = load_post_; \ |
| clazz->load_name = load_name_; \ |
| clazz->free_name = free_name_; \ |
| clazz->load_kern = load_kern_; \ |
| clazz->load_gasp = load_gasp_; \ |
| clazz->load_pclt = load_pclt_; \ |
| clazz->load_bhed = load_bhed_; \ |
| clazz->load_sbit_image = load_sbit_image_; \ |
| clazz->get_psname = get_psname_; \ |
| clazz->free_psnames = free_psnames_; \ |
| clazz->get_kerning = get_kerning_; \ |
| clazz->load_font_dir = load_font_dir_; \ |
| clazz->load_hmtx = load_hmtx_; \ |
| clazz->load_eblc = load_eblc_; \ |
| clazz->free_eblc = free_eblc_; \ |
| clazz->set_sbit_strike = set_sbit_strike_; \ |
| clazz->load_strike_metrics = load_strike_metrics_; \ |
| clazz->get_metrics = get_metrics_; \ |
| } |
| |
| #endif /* FT_CONFIG_OPTION_PIC */ |
| |
| FT_END_HEADER |
| |
| #endif /* __SFNT_H__ */ |
| |
| |
| /* END */ |
