ref: d515992587ca2db825158535ba02252a9f0bdb29
dir: /src/autofit/aflatin.h/
/***************************************************************************/ /* */ /* aflatin.h */ /* */ /* Auto-fitter hinting routines for latin writing system */ /* (specification). */ /* */ /* Copyright 2003-2007, 2009, 2011-2013 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_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 enum { AF_LATIN_BLUE_ACTIVE = 1 << 0, /* set if zone height is <= 3/4px */ AF_LATIN_BLUE_TOP = 1 << 1, /* result of AF_LATIN_IS_TOP_BLUE */ AF_LATIN_BLUE_ADJUSTMENT = 1 << 2, /* used for scale adjustment */ /* optimization */ AF_LATIN_BLUE_FLAG_MAX }; typedef struct AF_LatinBlueRec_ { AF_WidthRec ref; AF_WidthRec shoot; 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 *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ enum { AF_LATIN_HINTS_HORZ_SNAP = 1 << 0, /* enable stem width snapping */ AF_LATIN_HINTS_VERT_SNAP = 1 << 1, /* enable stem height snapping */ AF_LATIN_HINTS_STEM_ADJUST = 1 << 2, /* enable stem width/height */ /* adjustment */ AF_LATIN_HINTS_MONO = 1 << 3 /* indicate 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, 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, AF_Dimension dim ); /* */ FT_END_HEADER #endif /* __AFLATIN_H__ */ /* END */