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kc3-lang/freetype/src/autofit/aflatin.h
Werner Lemberg
- src/autofit/aflatin.h
-
/**************************************************************************** * * aflatin.h * * Auto-fitter hinting routines for latin writing system * (specification). * * Copyright (C) 2003-2020 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 */