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
27FT_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
106FT_END_HEADER
107
108#endif /* __TTSUBPIX_H__ */
109
110/* END */
111