ttobjs.c

奇趣公司比较新的qt/emd版本

    size->GS = tt_default_graphics_state;

    /* set `face->interpreter' according to the debug hook present */
    {
      FT_Library  library = face->root.driver->root.library;


      face->interpreter = (TT_Interpreter)
                            library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
      if ( !face->interpreter )
        face->interpreter = (TT_Interpreter)TT_RunIns;
    }

    /* Fine, now run the font program! */
    error = tt_size_run_fpgm( size );

  Exit:
    if ( error )
      tt_size_done_bytecode( ftsize );

    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  tt_size_ready_bytecode( TT_Size  size )
  {
    FT_Error  error = TT_Err_Ok;


    if ( !size->bytecode_ready )
    {
      error = tt_size_init_bytecode( (FT_Size)size );
      if ( error )
        goto Exit;
    }

    /* rescale CVT when needed */
    if ( !size->cvt_ready )
    {
      FT_UInt  i;
      TT_Face  face = (TT_Face) size->root.face;


      /* Scale the cvt values to the new ppem.          */
      /* We use by default the y ppem to scale the CVT. */
      for ( i = 0; i < size->cvt_size; i++ )
        size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );

      /* all twilight points are originally zero */
      for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ )
      {
        size->twilight.org[i].x = 0;
        size->twilight.org[i].y = 0;
        size->twilight.cur[i].x = 0;
        size->twilight.cur[i].y = 0;
      }

      /* clear storage area */
      for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
        size->storage[i] = 0;

      size->GS = tt_default_graphics_state;

      error = tt_size_run_prep( size );
    }
  Exit:
    return error;
  }

#else /* !TT_USE_BYTECODE_INTERPRETER */

  FT_LOCAL_DEF( FT_Error )
  tt_size_ready_bytecode( TT_Size  size )
  {
    FT_UNUSED( size );
    return 0;
  }

#endif /* !TT_USE_BYTECODE_INTERPRETER */


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_size_init                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initialize a new TrueType size object.                             */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    size :: A handle to the size object.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_size_init( FT_Size  ttsize )           /* TT_Size */
  {
    TT_Size   size  = (TT_Size)ttsize;
    FT_Error  error = TT_Err_Ok;

#ifdef TT_USE_BYTECODE_INTERPRETER
    size->bytecode_ready = 0;
    size->cvt_ready      = 0;
#endif

    size->ttmetrics.valid = FALSE;
    size->strike_index    = 0xFFFFFFFFUL;

    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_size_done                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The TrueType size object finalizer.                                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
  FT_LOCAL_DEF( void )
  tt_size_done( FT_Size  ttsize )           /* TT_Size */
  {
    TT_Size  size = (TT_Size)ttsize;


#ifdef TT_USE_BYTECODE_INTERPRETER
    if ( size->bytecode_ready )
      tt_size_done_bytecode( ttsize );
#endif

    size->ttmetrics.valid = FALSE;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_size_reset                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Reset a TrueType size when resolutions and character dimensions    */
  /*    have been changed.                                                 */
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_size_reset( TT_Size  size )
  {
    TT_Face           face;
    FT_Error          error = TT_Err_Ok;
    FT_Size_Metrics*  metrics;


    size->ttmetrics.valid = FALSE;

    face = (TT_Face)size->root.face;

    metrics = &size->metrics;

    /* copy the result from base layer */
    *metrics = size->root.metrics;

    if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
      return TT_Err_Invalid_PPem;

    /* This bit flag, if set, indicates that the ppems must be       */
    /* rounded to integers.  Nearly all TrueType fonts have this bit */
    /* set, as hinting won't work really well otherwise.             */
    /*                                                               */
    if ( face->header.Flags & 8 )
    {
      metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
                                    face->root.units_per_EM );
      metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
                                    face->root.units_per_EM );

      metrics->ascender =
        FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
      metrics->descender =
        FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
      metrics->height =
        FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
      metrics->max_advance =
        FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
                                 metrics->x_scale ) );
    }

    /* compute new transformation */
    if ( metrics->x_ppem >= metrics->y_ppem )
    {
      size->ttmetrics.scale   = metrics->x_scale;
      size->ttmetrics.ppem    = metrics->x_ppem;
      size->ttmetrics.x_ratio = 0x10000L;
      size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
                                           0x10000L,
                                           metrics->x_ppem );
    }
    else
    {
      size->ttmetrics.scale   = metrics->y_scale;
      size->ttmetrics.ppem    = metrics->y_ppem;
      size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
                                           0x10000L,
                                           metrics->y_ppem );
      size->ttmetrics.y_ratio = 0x10000L;
    }

#ifdef TT_USE_BYTECODE_INTERPRETER
    size->cvt_ready = 0;
#endif /* TT_USE_BYTECODE_INTERPRETER */

    if ( !error )
      size->ttmetrics.valid = TRUE;

    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_driver_init                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initialize a given TrueType driver object.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target driver object.                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_driver_init( FT_Module  ttdriver )     /* TT_Driver */
  {

#ifdef TT_USE_BYTECODE_INTERPRETER

    TT_Driver  driver = (TT_Driver)ttdriver;


    if ( !TT_New_Context( driver ) )
      return TT_Err_Could_Not_Find_Context;

#else

    FT_UNUSED( ttdriver );

#endif

    return TT_Err_Ok;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_driver_done                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalize a given TrueType driver.                                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target TrueType driver.                  */
  /*                                                                       */
  FT_LOCAL_DEF( void )
  tt_driver_done( FT_Module  ttdriver )     /* TT_Driver */
  {
#ifdef TT_USE_BYTECODE_INTERPRETER
    TT_Driver  driver = (TT_Driver)ttdriver;


    /* destroy the execution context */
    if ( driver->context )
    {
      TT_Done_Context( driver->context );
      driver->context = NULL;
    }
#else
    FT_UNUSED( ttdriver );
#endif

  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_slot_init                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initialize a new slot object.                                      */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    slot :: A handle to the slot object.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_slot_init( FT_GlyphSlot  slot )
  {
    return FT_GlyphLoader_CreateExtra( slot->internal->loader );
  }


/* END */