freetype1/lib/extend/ftxgasp.c

   1 /*******************************************************************
   2  *
   3  *  ftxgasp.c                                                   1.0
   4  *
   5  *    Gasp table support API extension body
   6  *
   7  *  Copyright 1996-1999 by
   8  *  David Turner, Robert Wilhelm, and Werner Lemberg.
   9  *
  10  *  This file is part of the FreeType project, and may only be used
  11  *  modified and distributed under the terms of the FreeType project
  12  *  license, LICENSE.TXT. By continuing to use, modify, or distribute
  13  *  this file you indicate that you have read the license and
  14  *  understand and accept it fully.
  15  *
  16  *
  17  *  The gasp table is currently loaded by the core engine, but the
  18  *  standard API doesn't give access to it.  This file is used to
  19  *  demonstrate the use of a simple API extension.
  20  *
  21  ******************************************************************/
  22
  23 #include "ftxgasp.h"
  24
  25 #include "tttypes.h"
  26 #include "ttobjs.h"
  27 #include "tttables.h"
  28
  29
  30   EXPORT_FUNC
  31   TT_Error  TT_Get_Face_Gasp_Flags( TT_Face    face,
  32                                     TT_UShort  point_size,
  33                                     TT_Bool*   grid_fit,
  34                                     TT_Bool*   smooth_font )
  35   {
  36     PFace   faze = HANDLE_Face( face );
  37     UShort  i, flag;
  38
  39
  40     if ( !faze )
  41       return TT_Err_Invalid_Face_Handle;
  42
  43     if ( faze->gasp.numRanges == 0 || !faze->gasp.gaspRanges )
  44       return TT_Err_Table_Missing;
  45
  46     for ( i = 0; i < faze->gasp.numRanges; i++ )
  47     {
  48       if ( point_size <= faze->gasp.gaspRanges[i].maxPPEM )
  49       {
  50         flag = faze->gasp.gaspRanges[i].gaspFlag;
  51
  52         *grid_fit    = ( (flag & GASP_GRIDFIT) != 0 );
  53         *smooth_font = ( (flag & GASP_DOGRAY ) != 0 );
  54
  55         return TT_Err_Ok;
  56       }
  57     }
  58
  59     /* for very large fonts we enable font smoothing and discard */
  60     /* grid fitting                                              */
  61
  62     *grid_fit    = 0;
  63     *smooth_font = 1;
  64
  65     return TT_Err_Ok;
  66   }
  67
  68
  69 /* END */