/***************************************************************************/ | |
/* */ | |
/* aflatin.h */ | |
/* */ | |
/* Auto-fitter hinting routines for latin writing system */ | |
/* (specification). */ | |
/* */ | |
/* Copyright 2003-2015 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 __AFLATIN_H__ | |
#define __AFLATIN_H__ | |
#include "afhints.h" | |
FT_BEGIN_HEADER | |
/* the `latin' writing system */ | |
AF_DECLARE_WRITING_SYSTEM_CLASS( af_latin_writing_system_class ) | |
/* constants are given with units_per_em == 2048 in mind */ | |
#define AF_LATIN_CONSTANT( metrics, c ) \ | |
( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 ) | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** L A T I N G L O B A L M E T R I C S *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/* | |
* The following declarations could be embedded in the file `aflatin.c'; | |
* they have been made semi-public to allow alternate writing system | |
* hinters to re-use some of them. | |
*/ | |
#define AF_LATIN_IS_TOP_BLUE( b ) \ | |
( (b)->properties & AF_BLUE_PROPERTY_LATIN_TOP ) | |
#define AF_LATIN_IS_NEUTRAL_BLUE( b ) \ | |
( (b)->properties & AF_BLUE_PROPERTY_LATIN_NEUTRAL ) | |
#define AF_LATIN_IS_X_HEIGHT_BLUE( b ) \ | |
( (b)->properties & AF_BLUE_PROPERTY_LATIN_X_HEIGHT ) | |
#define AF_LATIN_IS_LONG_BLUE( b ) \ | |
( (b)->properties & AF_BLUE_PROPERTY_LATIN_LONG ) | |
#define AF_LATIN_MAX_WIDTHS 16 | |
#define AF_LATIN_BLUE_ACTIVE ( 1U << 0 ) /* zone height is <= 3/4px */ | |
#define AF_LATIN_BLUE_TOP ( 1U << 1 ) /* we have a top blue zone */ | |
#define AF_LATIN_BLUE_NEUTRAL ( 1U << 2 ) /* we have neutral blue zone */ | |
#define AF_LATIN_BLUE_ADJUSTMENT ( 1U << 3 ) /* used for scale adjustment */ | |
/* optimization */ | |
typedef struct AF_LatinBlueRec_ | |
{ | |
AF_WidthRec ref; | |
AF_WidthRec shoot; | |
FT_Pos ascender; | |
FT_Pos descender; | |
FT_UInt flags; | |
} AF_LatinBlueRec, *AF_LatinBlue; | |
typedef struct AF_LatinAxisRec_ | |
{ | |
FT_Fixed scale; | |
FT_Pos delta; | |
FT_UInt width_count; /* number of used widths */ | |
AF_WidthRec widths[AF_LATIN_MAX_WIDTHS]; /* widths array */ | |
FT_Pos edge_distance_threshold; /* used for creating edges */ | |
FT_Pos standard_width; /* the default stem thickness */ | |
FT_Bool extra_light; /* is standard width very light? */ | |
/* ignored for horizontal metrics */ | |
FT_UInt blue_count; | |
AF_LatinBlueRec blues[AF_BLUE_STRINGSET_MAX]; | |
FT_Fixed org_scale; | |
FT_Pos org_delta; | |
} AF_LatinAxisRec, *AF_LatinAxis; | |
typedef struct AF_LatinMetricsRec_ | |
{ | |
AF_StyleMetricsRec root; | |
FT_UInt units_per_em; | |
AF_LatinAxisRec axis[AF_DIMENSION_MAX]; | |
} AF_LatinMetricsRec, *AF_LatinMetrics; | |
FT_LOCAL( FT_Error ) | |
af_latin_metrics_init( AF_LatinMetrics metrics, | |
FT_Face face ); | |
FT_LOCAL( void ) | |
af_latin_metrics_scale( AF_LatinMetrics metrics, | |
AF_Scaler scaler ); | |
FT_LOCAL( void ) | |
af_latin_metrics_init_widths( AF_LatinMetrics metrics, | |
FT_Face face ); | |
FT_LOCAL( void ) | |
af_latin_metrics_check_digits( AF_LatinMetrics metrics, | |
FT_Face face ); | |
/*************************************************************************/ | |
/*************************************************************************/ | |
/***** *****/ | |
/***** L A T I N G L Y P H A N A L Y S I S *****/ | |
/***** *****/ | |
/*************************************************************************/ | |
/*************************************************************************/ | |
#define AF_LATIN_HINTS_HORZ_SNAP ( 1U << 0 ) /* stem width snapping */ | |
#define AF_LATIN_HINTS_VERT_SNAP ( 1U << 1 ) /* stem height snapping */ | |
#define AF_LATIN_HINTS_STEM_ADJUST ( 1U << 2 ) /* stem width/height */ | |
/* adjustment */ | |
#define AF_LATIN_HINTS_MONO ( 1U << 3 ) /* monochrome rendering */ | |
#define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \ | |
AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP ) | |
#define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \ | |
AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP ) | |
#define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \ | |
AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST ) | |
#define AF_LATIN_HINTS_DO_MONO( h ) \ | |
AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO ) | |
/* | |
* The next functions shouldn't normally be exported. However, other | |
* writing systems might like to use these functions as-is. | |
*/ | |
FT_LOCAL( FT_Error ) | |
af_latin_hints_compute_segments( AF_GlyphHints hints, | |
AF_Dimension dim ); | |
FT_LOCAL( void ) | |
af_latin_hints_link_segments( AF_GlyphHints hints, | |
FT_UInt width_count, | |
AF_WidthRec* widths, | |
AF_Dimension dim ); | |
FT_LOCAL( FT_Error ) | |
af_latin_hints_compute_edges( AF_GlyphHints hints, | |
AF_Dimension dim ); | |
FT_LOCAL( FT_Error ) | |
af_latin_hints_detect_features( AF_GlyphHints hints, | |
FT_UInt width_count, | |
AF_WidthRec* widths, | |
AF_Dimension dim ); | |
/* */ | |
FT_END_HEADER | |
#endif /* __AFLATIN_H__ */ | |
/* END */ |