ref: 467e49e817336bf3b890cb0e7fe984a5cae2e5e7
dir: /src/autofit/afglobal.h/
/****************************************************************************
*
* afglobal.h
*
* Auto-fitter routines to compute global hinting values
* (specification).
*
* Copyright (C) 2003-2021 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.
*
*/
#ifndef AFGLOBAL_H_
#define AFGLOBAL_H_
#include "aftypes.h"
#include "afmodule.h"
#include "afshaper.h"
FT_BEGIN_HEADER
FT_LOCAL_ARRAY( AF_WritingSystemClass )
af_writing_system_classes[];
#undef SCRIPT
#define SCRIPT( s, S, d, h, H, ss ) \
AF_DECLARE_SCRIPT_CLASS( af_ ## s ## _script_class )
#include "afscript.h"
FT_LOCAL_ARRAY( AF_ScriptClass )
af_script_classes[];
#undef STYLE
#define STYLE( s, S, d, ws, sc, ss, c ) \
AF_DECLARE_STYLE_CLASS( af_ ## s ## _style_class )
#include "afstyles.h"
FT_LOCAL_ARRAY( AF_StyleClass )
af_style_classes[];
#ifdef FT_DEBUG_LEVEL_TRACE
FT_LOCAL_ARRAY( char* )
af_style_names[];
#endif
/*
* Default values and flags for both autofitter globals (found in
* AF_ModuleRec) and face globals (in AF_FaceGlobalsRec).
*/
/* index of fallback style in `af_style_classes' */
#ifdef AF_CONFIG_OPTION_CJK
#define AF_STYLE_FALLBACK AF_STYLE_HANI_DFLT
#else
#define AF_STYLE_FALLBACK AF_STYLE_NONE_DFLT
#endif
/* default script for OpenType; ignored if HarfBuzz isn't used */
#define AF_SCRIPT_DEFAULT AF_SCRIPT_LATN
/* a bit mask for AF_DIGIT and AF_NONBASE */
#define AF_STYLE_MASK 0x3FFF
/* an uncovered glyph */
#define AF_STYLE_UNASSIGNED AF_STYLE_MASK
/* if this flag is set, we have an ASCII digit */
#define AF_DIGIT 0x8000U
/* if this flag is set, we have a non-base character */
#define AF_NONBASE 0x4000U
/* `increase-x-height' property */
#define AF_PROP_INCREASE_X_HEIGHT_MIN 6
#define AF_PROP_INCREASE_X_HEIGHT_MAX 0
/************************************************************************/
/************************************************************************/
/***** *****/
/***** F A C E G L O B A L S *****/
/***** *****/
/************************************************************************/
/************************************************************************/
/*
* Note that glyph_styles[] maps each glyph to an index into the
* `af_style_classes' array.
*
*/
typedef struct AF_FaceGlobalsRec_
{
FT_Face face;
FT_Long glyph_count; /* same as face->num_glyphs */
FT_UShort* glyph_styles;
#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
hb_font_t* hb_font;
hb_buffer_t* hb_buf; /* for feature comparison */
#endif
/* per-face auto-hinter properties */
FT_UInt increase_x_height;
AF_StyleMetrics metrics[AF_STYLE_MAX];
/* Compute darkening amount once per size. Use this to check whether */
/* darken_{x,y} needs to be recomputed. */
FT_UShort stem_darkening_for_ppem;
/* Copy from e.g. AF_LatinMetrics.axis[AF_DIMENSION_HORZ] */
/* to compute the darkening amount. */
FT_Pos standard_vertical_width;
/* Copy from e.g. AF_LatinMetrics.axis[AF_DIMENSION_VERT] */
/* to compute the darkening amount. */
FT_Pos standard_horizontal_width;
/* The actual amount to darken a glyph along the X axis. */
FT_Pos darken_x;
/* The actual amount to darken a glyph along the Y axis. */
FT_Pos darken_y;
/* Amount to scale down by to keep emboldened points */
/* on the Y-axis in pre-computed blue zones. */
FT_Fixed scale_down_factor;
AF_Module module; /* to access global properties */
} AF_FaceGlobalsRec;
/*
* model the global hints data for a given face, decomposed into
* style-specific items
*/
FT_LOCAL( FT_Error )
af_face_globals_new( FT_Face face,
AF_FaceGlobals *aglobals,
AF_Module module );
FT_LOCAL( FT_Error )
af_face_globals_get_metrics( AF_FaceGlobals globals,
FT_UInt gindex,
FT_UInt options,
AF_StyleMetrics *ametrics );
FT_LOCAL( void )
af_face_globals_free( AF_FaceGlobals globals );
FT_LOCAL_DEF( FT_Bool )
af_face_globals_is_digit( AF_FaceGlobals globals,
FT_UInt gindex );
/* */
FT_END_HEADER
#endif /* AFGLOBAL_H_ */
/* END */