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      1 /***************************************************************************/
      2 /*                                                                         */
      3 /*  ftpfr.c                                                                */
      4 /*                                                                         */
      5 /*    FreeType API for accessing PFR-specific data (body).                 */
      6 /*                                                                         */
      7 /*  Copyright 2002-2018 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 
     18 #include <ft2build.h>
     19 #include FT_INTERNAL_DEBUG_H
     20 
     21 #include FT_INTERNAL_OBJECTS_H
     22 #include FT_SERVICE_PFR_H
     23 
     24 
     25   /* check the format */
     26   static FT_Service_PfrMetrics
     27   ft_pfr_check( FT_Face  face )
     28   {
     29     FT_Service_PfrMetrics  service = NULL;
     30 
     31 
     32     if ( face )
     33       FT_FACE_LOOKUP_SERVICE( face, service, PFR_METRICS );
     34 
     35     return service;
     36   }
     37 
     38 
     39   /* documentation is in ftpfr.h */
     40 
     41   FT_EXPORT_DEF( FT_Error )
     42   FT_Get_PFR_Metrics( FT_Face    face,
     43                       FT_UInt   *aoutline_resolution,
     44                       FT_UInt   *ametrics_resolution,
     45                       FT_Fixed  *ametrics_x_scale,
     46                       FT_Fixed  *ametrics_y_scale )
     47   {
     48     FT_Error               error = FT_Err_Ok;
     49     FT_Service_PfrMetrics  service;
     50 
     51 
     52     if ( !face )
     53       return FT_THROW( Invalid_Face_Handle );
     54 
     55     service = ft_pfr_check( face );
     56     if ( service )
     57     {
     58       error = service->get_metrics( face,
     59                                     aoutline_resolution,
     60                                     ametrics_resolution,
     61                                     ametrics_x_scale,
     62                                     ametrics_y_scale );
     63     }
     64     else
     65     {
     66       FT_Fixed  x_scale, y_scale;
     67 
     68 
     69       /* this is not a PFR font */
     70       if ( aoutline_resolution )
     71         *aoutline_resolution = face->units_per_EM;
     72 
     73       if ( ametrics_resolution )
     74         *ametrics_resolution = face->units_per_EM;
     75 
     76       x_scale = y_scale = 0x10000L;
     77       if ( face->size )
     78       {
     79         x_scale = face->size->metrics.x_scale;
     80         y_scale = face->size->metrics.y_scale;
     81       }
     82 
     83       if ( ametrics_x_scale )
     84         *ametrics_x_scale = x_scale;
     85 
     86       if ( ametrics_y_scale )
     87         *ametrics_y_scale = y_scale;
     88 
     89       error = FT_THROW( Unknown_File_Format );
     90     }
     91 
     92     return error;
     93   }
     94 
     95 
     96   /* documentation is in ftpfr.h */
     97 
     98   FT_EXPORT_DEF( FT_Error )
     99   FT_Get_PFR_Kerning( FT_Face     face,
    100                       FT_UInt     left,
    101                       FT_UInt     right,
    102                       FT_Vector  *avector )
    103   {
    104     FT_Error               error;
    105     FT_Service_PfrMetrics  service;
    106 
    107 
    108     if ( !face )
    109       return FT_THROW( Invalid_Face_Handle );
    110 
    111     if ( !avector )
    112       return FT_THROW( Invalid_Argument );
    113 
    114     service = ft_pfr_check( face );
    115     if ( service )
    116       error = service->get_kerning( face, left, right, avector );
    117     else
    118       error = FT_Get_Kerning( face, left, right,
    119                               FT_KERNING_UNSCALED, avector );
    120 
    121     return error;
    122   }
    123 
    124 
    125   /* documentation is in ftpfr.h */
    126 
    127   FT_EXPORT_DEF( FT_Error )
    128   FT_Get_PFR_Advance( FT_Face   face,
    129                       FT_UInt   gindex,
    130                       FT_Pos   *aadvance )
    131   {
    132     FT_Error               error;
    133     FT_Service_PfrMetrics  service;
    134 
    135 
    136     if ( !face )
    137       return FT_THROW( Invalid_Face_Handle );
    138 
    139     if ( !aadvance )
    140       return FT_THROW( Invalid_Argument );
    141 
    142     service = ft_pfr_check( face );
    143     if ( service )
    144       error = service->get_advance( face, gindex, aadvance );
    145     else
    146       /* XXX: TODO: PROVIDE ADVANCE-LOADING METHOD TO ALL FONT DRIVERS */
    147       error = FT_THROW( Invalid_Argument );
    148 
    149     return error;
    150   }
    151 
    152 
    153 /* END */
    154