212 lines
7.2 KiB
C
212 lines
7.2 KiB
C
/***************************************************************************/
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/* */
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/* aflatin.h */
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/* */
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/* Auto-fitter hinting routines for latin script (specification). */
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/* */
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/* Copyright 2003-2007, 2009, 2011 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __AFLATIN_H__
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#define __AFLATIN_H__
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#include "afhints.h"
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FT_BEGIN_HEADER
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/* the latin-specific script class */
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AF_DECLARE_SCRIPT_CLASS(af_latin_script_class)
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/* constants are given with units_per_em == 2048 in mind */
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#define AF_LATIN_CONSTANT( metrics, c ) \
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( ( (c) * (FT_Long)( (AF_LatinMetrics)(metrics) )->units_per_em ) / 2048 )
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** L A T I N G L O B A L M E T R I C S *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*
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* The following declarations could be embedded in the file `aflatin.c';
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* they have been made semi-public to allow alternate script hinters to
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* re-use some of them.
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*/
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/* Latin (global) metrics management */
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enum
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{
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AF_LATIN_BLUE_CAPITAL_TOP,
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AF_LATIN_BLUE_CAPITAL_BOTTOM,
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AF_LATIN_BLUE_SMALL_F_TOP,
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AF_LATIN_BLUE_SMALL_TOP,
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AF_LATIN_BLUE_SMALL_BOTTOM,
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AF_LATIN_BLUE_SMALL_MINOR,
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AF_LATIN_BLUE_MAX
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};
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#define AF_LATIN_IS_TOP_BLUE( b ) ( (b) == AF_LATIN_BLUE_CAPITAL_TOP || \
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(b) == AF_LATIN_BLUE_SMALL_F_TOP || \
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(b) == AF_LATIN_BLUE_SMALL_TOP )
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#define AF_LATIN_MAX_WIDTHS 16
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#define AF_LATIN_MAX_BLUES AF_LATIN_BLUE_MAX
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enum
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{
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AF_LATIN_BLUE_ACTIVE = 1 << 0, /* set if zone height is <= 3/4px */
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AF_LATIN_BLUE_TOP = 1 << 1, /* result of AF_LATIN_IS_TOP_BLUE */
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AF_LATIN_BLUE_ADJUSTMENT = 1 << 2, /* used for scale adjustment */
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/* optimization */
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AF_LATIN_BLUE_FLAG_MAX
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};
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typedef struct AF_LatinBlueRec_
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{
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AF_WidthRec ref;
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AF_WidthRec shoot;
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FT_UInt flags;
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} AF_LatinBlueRec, *AF_LatinBlue;
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typedef struct AF_LatinAxisRec_
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{
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FT_Fixed scale;
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FT_Pos delta;
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FT_UInt width_count; /* number of used widths */
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AF_WidthRec widths[AF_LATIN_MAX_WIDTHS]; /* widths array */
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FT_Pos edge_distance_threshold; /* used for creating edges */
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FT_Pos standard_width; /* the default stem thickness */
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FT_Bool extra_light; /* is standard width very light? */
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/* ignored for horizontal metrics */
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FT_UInt blue_count;
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AF_LatinBlueRec blues[AF_LATIN_BLUE_MAX];
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FT_Fixed org_scale;
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FT_Pos org_delta;
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} AF_LatinAxisRec, *AF_LatinAxis;
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typedef struct AF_LatinMetricsRec_
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{
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AF_ScriptMetricsRec root;
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FT_UInt units_per_em;
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AF_LatinAxisRec axis[AF_DIMENSION_MAX];
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} AF_LatinMetricsRec, *AF_LatinMetrics;
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FT_LOCAL( FT_Error )
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af_latin_metrics_init( AF_LatinMetrics metrics,
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FT_Face face );
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FT_LOCAL( void )
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af_latin_metrics_scale( AF_LatinMetrics metrics,
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AF_Scaler scaler );
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FT_LOCAL( void )
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af_latin_metrics_init_widths( AF_LatinMetrics metrics,
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FT_Face face,
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FT_ULong charcode );
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FT_LOCAL( void )
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af_latin_metrics_check_digits( AF_LatinMetrics metrics,
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FT_Face face );
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** L A T I N G L Y P H A N A L Y S I S *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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enum
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{
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AF_LATIN_HINTS_HORZ_SNAP = 1 << 0, /* enable stem width snapping */
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AF_LATIN_HINTS_VERT_SNAP = 1 << 1, /* enable stem height snapping */
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AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height */
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/* adjustment */
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AF_LATIN_HINTS_MONO = 1 << 3 /* indicate monochrome */
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/* rendering */
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};
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#define AF_LATIN_HINTS_DO_HORZ_SNAP( h ) \
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AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_HORZ_SNAP )
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#define AF_LATIN_HINTS_DO_VERT_SNAP( h ) \
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AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_VERT_SNAP )
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#define AF_LATIN_HINTS_DO_STEM_ADJUST( h ) \
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AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_STEM_ADJUST )
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#define AF_LATIN_HINTS_DO_MONO( h ) \
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AF_HINTS_TEST_OTHER( h, AF_LATIN_HINTS_MONO )
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/*
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* This shouldn't normally be exported. However, other scripts might
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* like to use this function as-is.
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*/
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FT_LOCAL( FT_Error )
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af_latin_hints_compute_segments( AF_GlyphHints hints,
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AF_Dimension dim );
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/*
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* This shouldn't normally be exported. However, other scripts might
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* want to use this function as-is.
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*/
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FT_LOCAL( void )
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af_latin_hints_link_segments( AF_GlyphHints hints,
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AF_Dimension dim );
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/*
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* This shouldn't normally be exported. However, other scripts might
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* want to use this function as-is.
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*/
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FT_LOCAL( FT_Error )
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af_latin_hints_compute_edges( AF_GlyphHints hints,
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AF_Dimension dim );
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FT_LOCAL( FT_Error )
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af_latin_hints_detect_features( AF_GlyphHints hints,
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AF_Dimension dim );
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/* */
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FT_END_HEADER
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#endif /* __AFLATIN_H__ */
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/* END */
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