ttobjs.c

Trolltech公司发布的基于C++图形开发环境

/***************************************************************************/
/*                                                                         */
/*  ttobjs.c                                                               */
/*                                                                         */
/*    Objects manager (body).                                              */
/*                                                                         */
/*  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 <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/ftstream.h>
#include <freetype/ttnameid.h>
#include <freetype/tttags.h>

#include <freetype/internal/sfnt.h>
#include <freetype/internal/psnames.h>


#ifdef FT_FLAT_COMPILE

#include "ttgload.h"
#include "ttpload.h"

#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
#include "ttinterp.h"
#endif

#else /* FT_FLAT_COMPILE */

#include <truetype/ttgload.h>
#include <truetype/ttpload.h>

#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
#include <truetype/ttinterp.h>
#endif

#endif /* FT_FLAT_COMPILE */


#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_ttobjs


#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER

  /*************************************************************************/
  /*                                                                       */
  /*                       GLYPH ZONE FUNCTIONS                            */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Done_GlyphZone                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Deallocates a glyph zone.                                          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    zone :: A pointer to the target glyph zone.                        */
  /*                                                                       */
  FT_LOCAL_DEF
  void  TT_Done_GlyphZone( TT_GlyphZone*  zone )
  {
    FT_Memory  memory = zone->memory;


    FREE( zone->contours );
    FREE( zone->tags );
    FREE( zone->cur );
    FREE( zone->org );

    zone->max_points   = zone->n_points   = 0;
    zone->max_contours = zone->n_contours = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_New_GlyphZone                                                   */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Allocates a new glyph zone.                                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory      :: A handle to the current memory object.              */
  /*                                                                       */
  /*    maxPoints   :: The capacity of glyph zone in points.               */
  /*                                                                       */
  /*    maxContours :: The capacity of glyph zone in contours.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    zone        :: A pointer to the target glyph zone record.          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF
  FT_Error TT_New_GlyphZone( FT_Memory      memory,
                             FT_UShort      maxPoints,
                             FT_Short       maxContours,
                             TT_GlyphZone*  zone )
  {
    FT_Error  error;


    if ( maxPoints > 0 )
      maxPoints += 2;

    MEM_Set( zone, 0, sizeof ( *zone ) );
    zone->memory = memory;

    if ( ALLOC_ARRAY( zone->org,      maxPoints * 2, FT_F26Dot6 ) ||
         ALLOC_ARRAY( zone->cur,      maxPoints * 2, FT_F26Dot6 ) ||
         ALLOC_ARRAY( zone->tags,     maxPoints,     FT_Byte    ) ||
         ALLOC_ARRAY( zone->contours, maxContours,   FT_UShort  ) )
    {
      TT_Done_GlyphZone( zone );
    }

    return error;
  }
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Init_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given TrueType face object.                          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream     :: The source font stream.                              */
  /*                                                                       */
  /*    face_index :: The index of the font face in the resource.          */
  /*                                                                       */
  /*    num_params :: Number of additional generic parameters.  Ignored.   */
  /*                                                                       */
  /*    params     :: Additional generic parameters.  Ignored.             */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    face       :: The newly built face object.                         */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL
  FT_Error  TT_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;
    SFNT_Interface*  sfnt;


    library = face->root.driver->root.library;
    sfnt    = (SFNT_Interface*)FT_Get_Module_Interface( library, "sfnt" );
    if ( !sfnt )
      goto Bad_Format;

    /* create input stream from resource */
    if ( FILE_Seek( 0 ) )
      goto Exit;

    /* check that we have a valid TrueType file */
    error = sfnt->init_face( stream, face, face_index, num_params, params );
    if ( error )
      goto Exit;

    /* We must also be able to accept Mac/GX fonts, as well as OT ones */
    if ( face->format_tag != 0x00010000L &&    /* MS fonts  */
         face->format_tag != TTAG_true   )     /* Mac fonts */
    {
      FT_TRACE2(( "[not a valid TTF font]\n" ));
      goto Bad_Format;
    }

    /* If we are performing a simple font format check, exit immediately */
    if ( face_index < 0 )
      return TT_Err_Ok;

    /* Load font directory */
    error = sfnt->load_face( stream, face, face_index, num_params, params );
    if ( error )
      goto Exit;

    if ( face->root.face_flags & FT_FACE_FLAG_SCALABLE )
      error = TT_Load_Locations( face, stream ) ||
              TT_Load_CVT      ( face, stream ) ||
              TT_Load_Programs ( face, stream );

    /* initialize standard glyph loading routines */
    TT_Init_Glyph_Loading( face );

  Exit:
    return error;

  Bad_Format:
    error = FT_Err_Unknown_File_Format;
    goto Exit;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Done_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given face object.                                     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A pointer to the face object to destroy.                   */
  /*                                                                       */
  FT_LOCAL
  void  TT_Done_Face( TT_Face  face )
  {
    FT_Memory  memory = face->root.memory;
    FT_Stream  stream = face->root.stream;

    SFNT_Interface*  sfnt = (SFNT_Interface*)face->sfnt;


    /* for `extended TrueType formats' (i.e. compressed versions) */
    if ( face->extra.finalizer )
      face->extra.finalizer( face->extra.data );

    if ( sfnt )
      sfnt->done_face( face );

    /* freeing the locations table */
    FREE( face->glyph_locations );
    face->num_locations = 0;

    /* freeing the CVT */
    FREE( face->cvt );
    face->cvt_size = 0;

    /* freeing the programs */
    RELEASE_Frame( face->font_program );
    RELEASE_Frame( face->cvt_program );
    face->font_program_size = 0;
    face->cvt_program_size  = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                           SIZE  FUNCTIONS                             */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Init_Size                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a new TrueType size object.                            */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    size :: A handle to the size object.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */