src/truetype/ttsubpix.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ttsubpix.h                                                             */
   4 /*                                                                         */
   5 /*    TrueType Subpixel Hinting.                                           */
   6 /*                                                                         */
   7 /*  Copyright 2010-2013 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 __TTSUBPIX_H__
  20 #define __TTSUBPIX_H__
  21
  22 #include <ft2build.h>
  23 #include "ttobjs.h"
  24 #include "ttinterp.h"
  25
  26
  27 FT_BEGIN_HEADER
  28
  29
  30 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
  31
  32   /*************************************************************************/
  33   /*                                                                       */
  34   /* ID flags to identify special functions at FDEF and runtime.           */
  35   /*                                                                       */
  36   /*                                                                       */
  37 #define SPH_FDEF_INLINE_DELTA_1       0x0000001
  38 #define SPH_FDEF_INLINE_DELTA_2       0x0000002
  39 #define SPH_FDEF_DIAGONAL_STROKE      0x0000004
  40 #define SPH_FDEF_VACUFORM_ROUND_1     0x0000008
  41 #define SPH_FDEF_TTFAUTOHINT_1        0x0000010
  42 #define SPH_FDEF_SPACING_1            0x0000020
  43 #define SPH_FDEF_SPACING_2            0x0000040
  44 #define SPH_FDEF_TYPEMAN_STROKES      0x0000080
  45 #define SPH_FDEF_TYPEMAN_DIAGENDCTRL  0x0000100
  46
  47
  48   /*************************************************************************/
  49   /*                                                                       */
  50   /* Tweak flags that are set for each glyph by the below rules.           */
  51   /*                                                                       */
  52   /*                                                                       */
  53 #define SPH_TWEAK_ALLOW_X_DMOVE                   0x0000001
  54 #define SPH_TWEAK_ALWAYS_DO_DELTAP                0x0000002
  55 #define SPH_TWEAK_ALWAYS_SKIP_DELTAP              0x0000004
  56 #define SPH_TWEAK_COURIER_NEW_2_HACK              0x0000008
  57 #define SPH_TWEAK_DEEMBOLDEN                      0x0000010
  58 #define SPH_TWEAK_DO_SHPIX                        0x0000020
  59 #define SPH_TWEAK_EMBOLDEN                        0x0000040
  60 #define SPH_TWEAK_MIAP_HACK                       0x0000080
  61 #define SPH_TWEAK_NORMAL_ROUND                    0x0000100
  62 #define SPH_TWEAK_NO_ALIGNRP_AFTER_IUP            0x0000200
  63 #define SPH_TWEAK_NO_CALL_AFTER_IUP               0x0000400
  64 #define SPH_TWEAK_NO_DELTAP_AFTER_IUP             0x0000800
  65 #define SPH_TWEAK_PIXEL_HINTING                   0x0001000
  66 #define SPH_TWEAK_RASTERIZER_35                   0x0002000
  67 #define SPH_TWEAK_ROUND_NONPIXEL_Y_MOVES          0x0004000
  68 #define SPH_TWEAK_SKIP_IUP                        0x0008000
  69 #define SPH_TWEAK_SKIP_NONPIXEL_Y_MOVES           0x0010000
  70 #define SPH_TWEAK_SKIP_OFFPIXEL_Y_MOVES           0x0020000
  71 #define SPH_TWEAK_TIMES_NEW_ROMAN_HACK            0x0040000
  72 #define SPH_TWEAK_SKIP_NONPIXEL_Y_MOVES_DELTAP    0x0080000
  73
  74
  75   FT_LOCAL( FT_Bool )
  76   sph_test_tweak( TT_Face               face,
  77                   const FT_String*      family,
  78                   FT_UInt               ppem,
  79                   const FT_String*      style,
  80                   FT_UInt               glyph_index,
  81                   const SPH_TweakRule*  rule,
  82                   FT_UInt               num_rules );
  83
  84   FT_LOCAL( FT_UInt )
  85   sph_test_tweak_x_scaling( TT_Face           face,
  86                             const FT_String*  family,
  87                             FT_UInt           ppem,
  88                             const FT_String*  style,
  89                             FT_UInt           glyph_index );
  90
  91   FT_LOCAL( void )
  92   sph_set_tweaks( TT_Loader  loader,
  93                   FT_UInt    glyph_index );
  94
  95
  96   /* These macros are defined absent a method for setting them */
  97 #define SPH_OPTION_BITMAP_WIDTHS           FALSE
  98 #define SPH_OPTION_SET_SUBPIXEL            TRUE
  99 #define SPH_OPTION_SET_GRAYSCALE           FALSE
 100 #define SPH_OPTION_SET_COMPATIBLE_WIDTHS   FALSE
 101 #define SPH_OPTION_SET_RASTERIZER_VERSION  38
 102
 103 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */
 104
 105
 106 FT_END_HEADER
 107
 108 #endif /* __TTSUBPIX_H__ */
 109
 110 /* END */