/***************************************************************************//*                                                                         *//*  sfnt.h                                                                 *//*                                                                         *//*    High-level `sfnt' driver interface (specification).                  *//*                                                                         *//*  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.                                        *//*                                                                         *//***************************************************************************/  #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 will find */  /*    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 will     */  /*    load 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 );    typedef FT_Module_Interface  (*SFNT_Get_Interface_Func)( FT_Module    module,                              const char*  func_interface );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Load_SFNT_HeaderRec_Func                                        */  /*                                                                       */  /* <Description>                                                         */  /*    Loads the header of a SFNT font file.  Supports collections.       */  /*                                                                       */  /* <Input>                                                               */  /*    face       :: A handle to the target face object.                  */  /*                                                                       */  /*    stream     :: The input stream.                                    */  /*                                                                       */  /*    face_index :: The index of the TrueType font, if we are opening a  */  /*                  collection.                                          */  /*                                                                       */  /* <Output>                                                              */  /*    sfnt       :: The SFNT header.                                     */  /*                                                                       */  /* <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'.                                                       */  /*                                                                       */  /*    This function checks that the header is valid by looking at the    */  /*    values of `search_range', `entry_selector', and `range_shift'.     */  /*                                                                       */  typedef FT_Error  (*TT_Load_SFNT_HeaderRec_Func)( TT_Face      face,                                  FT_Stream    stream,                                  FT_Long      face_index,                                  SFNT_Header  sfnt );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Load_Directory_Func                                             */  /*                                                                       */  /* <Description>                                                         */  /*    Loads the table directory into a face object.                      */  /*                                                                       */  /* <Input>                                                               */  /*    face      :: A handle to the target face object.                   */  /*                                                                       */  /*    stream    :: The input stream.                                     */  /*                                                                       */  /*    sfnt      :: The SFNT header.                                      */  /*                                                                       */  /* <Return>                                                              */  /*    FreeType error code.  0 means success.                             */  /*                                                                       */  /* <Note>                                                                */  /*    The stream cursor must be on the first byte after the 4-byte font  */  /*    format tag.  This is the case just after a call to                 */  /*    TT_Load_Format_Tag().                                              */  /*                                                                       */  typedef FT_Error  (*TT_Load_Directory_Func)( TT_Face      face,                             FT_Stream    stream,                             SFNT_Header  sfnt );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Load_Any_Func                                                   */  /*                                                                       */  /* <Description>                                                         */  /*    Loads 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_Load_SBit_Image_Func                                            */  /*                                                                       */  /* <Description>                                                         */  /*    Loads a given glyph sbit image from the font resource.  This also  */  /*    returns its metrics.                                               */  /*                                                                       */  /* <Input>                                                               */  /*    face        :: The target face object.                             */  /*                                                                       */  /*    x_ppem      :: The horizontal resolution in points per EM.         */  /*                                                                       */  /*    y_ppem      :: The vertical resolution in points per EM.           */  /*                                                                       */  /*    glyph_index :: The current glyph index.                            */  /*                                                                       */  /*    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>                                                         */  /*    Selects an sbit strike for given horizontal and vertical ppem      */  /*    values.                                                            */  /*                                                                       */  /* <Input>                                                               */  /*    face          :: The target face object.                           */  /*                                                                       */  /*    x_ppem        :: The horizontal resolution in points per EM.       */  /*                                                                       */  /*    y_ppem        :: The vertical resolution in points per EM.         */  /*                                                                       */  /* <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_Int     x_ppem,                              FT_Int     y_ppem,                              FT_ULong  *astrike_index );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Get_PS_Name_Func                                                */  /*                                                                       */  /* <Description>                                                         */  /*    Gets 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>                                                         */  /*    Loads the horizontal or vertical header in a face object.          */  /*                                                                       */  /* <Input>                                                               */  /*    face     :: A handle to the target face object.                    */  /*                                                                       */  /*    stream   :: The input stream.                                      */  /*                                                                       */  /*    vertical :: A boolean flag.  If set, load vertical metrics.        */  /*                                                                       */  /* <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_CharMap_Load_Func                                               */  /*                                                                       */  /* <Description>                                                         */  /*    Loads a given TrueType character map into memory.                  */  /*                                                                       */  /* <Input>                                                               */  /*    face   :: A handle to the parent face object.                      */  /*                                                                       */  /*    stream :: A handle to the current stream object.                   */  /*                                                                       */  /* <InOut>                                                               */  /*    cmap   :: A pointer to a cmap object.                              */  /*                                                                       */  /* <Return>                                                              */  /*    FreeType error code.  0 means success.                             */  /*                                                                       */  /* <Note>                                                                */  /*    The function assumes that the stream is already in use (i.e.,      */  /*    opened).  In case of error, all partially allocated tables are     */  /*    released.                                                          */  /*                                                                       */  typedef FT_Error  (*TT_CharMap_Load_Func)( TT_Face       face,                           TT_CMapTable  cmap,                           FT_Stream     input );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_CharMap_Free_Func                                               */  /*                                                                       */  /* <Description>                                                         */  /*    Destroys a character mapping table.                                */  /*                                                                       */  /* <Input>                                                               */  /*    face :: A handle to the parent face object.                        */  /*                                                                       */  /*    cmap :: A handle to a cmap object.                                 */  /*                                                                       */  /* <Return>                                                              */  /*    FreeType error code.  0 means success.                             */  /*                                                                       */  typedef FT_Error  (*TT_CharMap_Free_Func)( TT_Face       face,                           TT_CMapTable  cmap );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Load_Table_Func                                                 */  /*                                                                       */  /* <Description>                                                         */  /*    Loads 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 will use `face->goto_table' to seek the stream to     */  /*    the start of the table.                                            */  /*                                                                       */  typedef FT_Error  (*TT_Load_Table_Func)( TT_Face    face,                         FT_Stream  stream );    /*************************************************************************/  /*                                                                       */  /* <FuncType>                                                            */  /*    TT_Free_Table_Func                                                 */  /*                                                                       */  /* <Description>                                                         */  /*    Frees a given TrueType table.                                      */  /*                                                                       */  /* <Input>                                                               */  /*    face :: A handle to the target face object.                        */  /*                                                                       */  typedef void  (*TT_Free_Table_Func)( TT_Face  face );    /*************************************************************************/  /*                                                                       */  /* <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;    SFNT_Get_Interface_Func      get_interface;     TT_Load_Any_Func             load_any;    TT_Load_SFNT_HeaderRec_Func  load_sfnt_header;    TT_Load_Directory_Func       load_directory;     /* 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_header;    TT_Load_Metrics_Func         load_metrics;    TT_Load_Table_Func           load_charmaps;    TT_Load_Table_Func           load_max_profile;    TT_Load_Table_Func           load_os2;    TT_Load_Table_Func           load_psnames;     TT_Load_Table_Func           load_names;    TT_Free_Table_Func           free_names;     /* optional tables */    TT_Load_Table_Func           load_hdmx;    TT_Free_Table_Func           free_hdmx; 

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