ftpfr.c

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/***************************************************************************/
/*                                                                         */
/*  ftpfr.c                                                                */
/*                                                                         */
/*    FreeType API for accessing PFR-specific data (body).                 */
/*                                                                         */
/*  Copyright 2002-2018 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 <ft2build.h>
#include FT_INTERNAL_DEBUG_H
 
#include FT_INTERNAL_OBJECTS_H
#include FT_SERVICE_PFR_H
 
 
  /* check the format */
  static FT_Service_PfrMetrics
  ft_pfr_check( FT_Face  face )
  {
    FT_Service_PfrMetrics  service = NULL;
 
 
    if ( face )
      FT_FACE_LOOKUP_SERVICE( face, service, PFR_METRICS );
 
    return service;
  }
 
 
  /* documentation is in ftpfr.h */
 
  FT_EXPORT_DEF( FT_Error )
  FT_Get_PFR_Metrics( FT_Face    face,
                      FT_UInt   *aoutline_resolution,
                      FT_UInt   *ametrics_resolution,
                      FT_Fixed  *ametrics_x_scale,
                      FT_Fixed  *ametrics_y_scale )
  {
    FT_Error               error = FT_Err_Ok;
    FT_Service_PfrMetrics  service;
 
 
    if ( !face )
      return FT_THROW( Invalid_Face_Handle );
 
    service = ft_pfr_check( face );
    if ( service )
    {
      error = service->get_metrics( face,
                                    aoutline_resolution,
                                    ametrics_resolution,
                                    ametrics_x_scale,
                                    ametrics_y_scale );
    }
    else
    {
      FT_Fixed  x_scale, y_scale;
 
 
      /* this is not a PFR font */
      if ( aoutline_resolution )
        *aoutline_resolution = face->units_per_EM;
 
      if ( ametrics_resolution )
        *ametrics_resolution = face->units_per_EM;
 
      x_scale = y_scale = 0x10000L;
      if ( face->size )
      {
        x_scale = face->size->metrics.x_scale;
        y_scale = face->size->metrics.y_scale;
      }
 
      if ( ametrics_x_scale )
        *ametrics_x_scale = x_scale;
 
      if ( ametrics_y_scale )
        *ametrics_y_scale = y_scale;
 
      error = FT_THROW( Unknown_File_Format );
    }
 
    return error;
  }
 
 
  /* documentation is in ftpfr.h */
 
  FT_EXPORT_DEF( FT_Error )
  FT_Get_PFR_Kerning( FT_Face     face,
                      FT_UInt     left,
                      FT_UInt     right,
                      FT_Vector  *avector )
  {
    FT_Error               error;
    FT_Service_PfrMetrics  service;
 
 
    if ( !face )
      return FT_THROW( Invalid_Face_Handle );
 
    if ( !avector )
      return FT_THROW( Invalid_Argument );
 
    service = ft_pfr_check( face );
    if ( service )
      error = service->get_kerning( face, left, right, avector );
    else
      error = FT_Get_Kerning( face, left, right,
                              FT_KERNING_UNSCALED, avector );
 
    return error;
  }
 
 
  /* documentation is in ftpfr.h */
 
  FT_EXPORT_DEF( FT_Error )
  FT_Get_PFR_Advance( FT_Face   face,
                      FT_UInt   gindex,
                      FT_Pos   *aadvance )
  {
    FT_Error               error;
    FT_Service_PfrMetrics  service;
 
 
    if ( !face )
      return FT_THROW( Invalid_Face_Handle );
 
    if ( !aadvance )
      return FT_THROW( Invalid_Argument );
 
    service = ft_pfr_check( face );
    if ( service )
      error = service->get_advance( face, gindex, aadvance );
    else
      /* XXX: TODO: PROVIDE ADVANCE-LOADING METHOD TO ALL FONT DRIVERS */
      error = FT_THROW( Invalid_Argument );
 
    return error;
  }
 
 
/* END */