src/truetype/ttsubpix.h

   1 /****************************************************************************
   2  *
   3  * ttsubpix.h
   4  *
   5  *   TrueType Subpixel Hinting.
   6  *
   7  * Copyright (C) 2010-2020 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 "ttobjs.h"
  23 #include "ttinterp.h"
  24
  25
  26 FT_BEGIN_HEADER
  27
  28
  29 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
  30
  31   /**************************************************************************
  32    *
  33    * ID flags to identify special functions at FDEF and runtime.
  34    *
  35    */
  36 #define SPH_FDEF_INLINE_DELTA_1       0x0000001
  37 #define SPH_FDEF_INLINE_DELTA_2       0x0000002
  38 #define SPH_FDEF_DIAGONAL_STROKE      0x0000004
  39 #define SPH_FDEF_VACUFORM_ROUND_1     0x0000008
  40 #define SPH_FDEF_TTFAUTOHINT_1        0x0000010
  41 #define SPH_FDEF_SPACING_1            0x0000020
  42 #define SPH_FDEF_SPACING_2            0x0000040
  43 #define SPH_FDEF_TYPEMAN_STROKES      0x0000080
  44 #define SPH_FDEF_TYPEMAN_DIAGENDCTRL  0x0000100
  45
  46
  47   /**************************************************************************
  48    *
  49    * Tweak flags that are set for each glyph by the below rules.
  50    *
  51    */
  52 #define SPH_TWEAK_ALLOW_X_DMOVE                   0x0000001UL
  53 #define SPH_TWEAK_ALWAYS_DO_DELTAP                0x0000002UL
  54 #define SPH_TWEAK_ALWAYS_SKIP_DELTAP              0x0000004UL
  55 #define SPH_TWEAK_COURIER_NEW_2_HACK              0x0000008UL
  56 #define SPH_TWEAK_DEEMBOLDEN                      0x0000010UL
  57 #define SPH_TWEAK_DO_SHPIX                        0x0000020UL
  58 #define SPH_TWEAK_EMBOLDEN                        0x0000040UL
  59 #define SPH_TWEAK_MIAP_HACK                       0x0000080UL
  60 #define SPH_TWEAK_NORMAL_ROUND                    0x0000100UL
  61 #define SPH_TWEAK_NO_ALIGNRP_AFTER_IUP            0x0000200UL
  62 #define SPH_TWEAK_NO_CALL_AFTER_IUP               0x0000400UL
  63 #define SPH_TWEAK_NO_DELTAP_AFTER_IUP             0x0000800UL
  64 #define SPH_TWEAK_PIXEL_HINTING                   0x0001000UL
  65 #define SPH_TWEAK_RASTERIZER_35                   0x0002000UL
  66 #define SPH_TWEAK_ROUND_NONPIXEL_Y_MOVES          0x0004000UL
  67 #define SPH_TWEAK_SKIP_IUP                        0x0008000UL
  68 #define SPH_TWEAK_SKIP_NONPIXEL_Y_MOVES           0x0010000UL
  69 #define SPH_TWEAK_SKIP_OFFPIXEL_Y_MOVES           0x0020000UL
  70 #define SPH_TWEAK_TIMES_NEW_ROMAN_HACK            0x0040000UL
  71 #define SPH_TWEAK_SKIP_NONPIXEL_Y_MOVES_DELTAP    0x0080000UL
  72
  73
  74   FT_LOCAL( FT_Bool )
  75   sph_test_tweak( TT_Face               face,
  76                   const FT_String*      family,
  77                   FT_UInt               ppem,
  78                   const FT_String*      style,
  79                   FT_UInt               glyph_index,
  80                   const SPH_TweakRule*  rule,
  81                   FT_UInt               num_rules );
  82
  83   FT_LOCAL( FT_UInt )
  84   sph_test_tweak_x_scaling( TT_Face           face,
  85                             const FT_String*  family,
  86                             FT_UInt           ppem,
  87                             const FT_String*  style,
  88                             FT_UInt           glyph_index );
  89
  90   FT_LOCAL( void )
  91   sph_set_tweaks( TT_Loader  loader,
  92                   FT_UInt    glyph_index );
  93
  94
  95   /* These macros are defined absent a method for setting them */
  96 #define SPH_OPTION_BITMAP_WIDTHS           FALSE
  97 #define SPH_OPTION_SET_SUBPIXEL            TRUE
  98 #define SPH_OPTION_SET_GRAYSCALE           FALSE
  99 #define SPH_OPTION_SET_COMPATIBLE_WIDTHS   FALSE
 100 #define SPH_OPTION_SET_RASTERIZER_VERSION  38
 101
 102 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
 103
 104
 105 FT_END_HEADER
 106
 107 #endif /* TTSUBPIX_H_ */
 108
 109
 110 /* END */