| /***************************************************************************/ |
| /* */ |
| /* aflatin.h */ |
| /* */ |
| /* Auto-fitter hinting routines for latin script (specification). */ |
| /* */ |
| /* Copyright 2003-2007, 2009, 2011-2012 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-specific script class */ |
| |
| AF_DECLARE_SCRIPT_CLASS( af_latin_script_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 script hinters to |
| * re-use some of them. |
| */ |
| |
| |
| /* Latin (global) metrics management */ |
| |
| enum |
| { |
| AF_LATIN_BLUE_CAPITAL_TOP, |
| AF_LATIN_BLUE_CAPITAL_BOTTOM, |
| AF_LATIN_BLUE_SMALL_F_TOP, |
| AF_LATIN_BLUE_SMALL_TOP, |
| AF_LATIN_BLUE_SMALL_BOTTOM, |
| AF_LATIN_BLUE_SMALL_MINOR, |
| |
| AF_LATIN_BLUE_MAX |
| }; |
| |
| |
| #define AF_LATIN_IS_TOP_BLUE( b ) ( (b) == AF_LATIN_BLUE_CAPITAL_TOP || \ |
| (b) == AF_LATIN_BLUE_SMALL_F_TOP || \ |
| (b) == AF_LATIN_BLUE_SMALL_TOP ) |
| |
| #define AF_LATIN_MAX_WIDTHS 16 |
| #define AF_LATIN_MAX_BLUES AF_LATIN_BLUE_MAX |
| |
| |
| 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_LATIN_BLUE_MAX]; |
| |
| FT_Fixed org_scale; |
| FT_Pos org_delta; |
| |
| } AF_LatinAxisRec, *AF_LatinAxis; |
| |
| |
| typedef struct AF_LatinMetricsRec_ |
| { |
| AF_ScriptMetricsRec 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 |
| * scripts 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 */ |