reactos/dll/3rdparty/freetype/include/freetype/ftgasp.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftgasp.h                                                               */
   4 /*                                                                         */
   5 /*    Access of TrueType's `gasp' table (specification).                   */
   6 /*                                                                         */
   7 /*  Copyright 2007 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
  19 #ifndef _FT_GASP_H_
  20 #define _FT_GASP_H_
  21
  22 #include <ft2build.h>
  23 #include FT_FREETYPE_H
  24
  25   /***************************************************************************
  26    *
  27    * @section:
  28    *   gasp_table
  29    *
  30    * @title:
  31    *   Gasp Table
  32    *
  33    * @abstract:
  34    *   Retrieving TrueType `gasp' table entries
  35    *
  36    * @description:
  37    *   The function @FT_Get_Gasp can be used to query a TrueType or OpenType
  38    *   font for specific entries in their `gasp' table, if any.  This is
  39    *   mainly useful when implementing native TrueType hinting with the
  40    *   bytecode interpreter to duplicate the Windows text rendering results.
  41    */
  42
  43   /*************************************************************************
  44    *
  45    * @enum:
  46    *   FT_GASP_XXX
  47    *
  48    * @description:
  49    *   A list of values and/or bit-flags returned by the @FT_Get_Gasp
  50    *   function.
  51    *
  52    * @values:
  53    *   FT_GASP_NO_TABLE ::
  54    *     This special value means that there is no GASP table in this face.
  55    *     It is up to the client to decide what to do.
  56    *
  57    *   FT_GASP_DO_GRIDFIT ::
  58    *     Grid-fitting and hinting should be performed at the specified ppem.
  59    *     This *really* means TrueType bytecode interpretation.
  60    *
  61    *   FT_GASP_DO_GRAY ::
  62    *     Anti-aliased rendering should be performed at the specified ppem.
  63    *
  64    *   FT_GASP_SYMMETRIC_SMOOTHING ::
  65    *     Smoothing along multiple axes must be used with ClearType.
  66    *
  67    *   FT_GASP_SYMMETRIC_GRIDFIT ::
  68    *     Grid-fitting must be used with ClearType's symmetric smoothing.
  69    *
  70    * @note:
  71    *   `ClearType' is Microsoft's implementation of LCD rendering, partly
  72    *   protected by patents.
  73    *
  74    * @since:
  75    *   2.3.0
  76    */
  77 #define FT_GASP_NO_TABLE               -1
  78 #define FT_GASP_DO_GRIDFIT           0x01
  79 #define FT_GASP_DO_GRAY              0x02
  80 #define FT_GASP_SYMMETRIC_SMOOTHING  0x08
  81 #define FT_GASP_SYMMETRIC_GRIDFIT    0x10
  82
  83
  84   /*************************************************************************
  85    *
  86    * @func:
  87    *   FT_Get_Gasp
  88    *
  89    * @description:
  90    *   Read the `gasp' table from a TrueType or OpenType font file and
  91    *   return the entry corresponding to a given character pixel size.
  92    *
  93    * @input:
  94    *   face :: The source face handle.
  95    *   ppem :: The vertical character pixel size.
  96    *
  97    * @return:
  98    *   Bit flags (see @FT_GASP_XXX), or @FT_GASP_NO_TABLE is there is no
  99    *   `gasp' table in the face.
 100    *
 101    * @since:
 102    *   2.3.0
 103    */
 104   FT_EXPORT( FT_Int )
 105   FT_Get_Gasp( FT_Face  face,
 106                FT_UInt  ppem );
 107
 108 /* */
 109
 110 #endif /* _FT_GASP_H_ */
 111
 112
 113 /* END */