| /**************************************************************************** |
| * |
| * aflatin.h |
| * |
| * Auto-fitter hinting routines for latin writing system |
| * (specification). |
| * |
| * Copyright (C) 2003-2022 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_SUB_TOP_BLUE( b ) \ |
| ( (b)->properties & AF_BLUE_PROPERTY_LATIN_SUB_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_SUB_TOP ( 1U << 2 ) /* we have a subscript top */ |
| /* blue zone */ |
| #define AF_LATIN_BLUE_NEUTRAL ( 1U << 3 ) /* we have neutral blue zone */ |
| #define AF_LATIN_BLUE_ADJUSTMENT ( 1U << 4 ) /* 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 */ |