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/****************************************************************************
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*
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* afcjk.h
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*
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* Auto-fitter hinting routines for CJK writing system (specification).
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*
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* Copyright (C) 2006-2019 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 AFCJK_H_
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#define AFCJK_H_
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#include "afhints.h"
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#include "aflatin.h"
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FT_BEGIN_HEADER
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/* the CJK-specific writing system */
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AF_DECLARE_WRITING_SYSTEM_CLASS( af_cjk_writing_system_class )
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** C J K 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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54876
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* CJK glyphs tend to fill the square. So we have both vertical and
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* horizontal blue zones. But some glyphs have flat bounding strokes that
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* leave some space between neighbour glyphs.
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*/
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#define AF_CJK_IS_TOP_BLUE( b ) \
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( (b)->properties & AF_BLUE_PROPERTY_CJK_TOP )
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#define AF_CJK_IS_HORIZ_BLUE( b ) \
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( (b)->properties & AF_BLUE_PROPERTY_CJK_HORIZ )
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#define AF_CJK_IS_RIGHT_BLUE AF_CJK_IS_TOP_BLUE
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#define AF_CJK_MAX_WIDTHS 16
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#define AF_CJK_BLUE_ACTIVE ( 1U << 0 ) /* zone height is <= 3/4px */
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#define AF_CJK_BLUE_TOP ( 1U << 1 ) /* result of AF_CJK_IS_TOP_BLUE */
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#define AF_CJK_BLUE_ADJUSTMENT ( 1U << 2 ) /* used for scale adjustment */
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/* optimization */
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typedef struct AF_CJKBlueRec_
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{
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AF_WidthRec ref;
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AF_WidthRec shoot; /* undershoot */
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FT_UInt flags;
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} AF_CJKBlueRec, *AF_CJKBlue;
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typedef struct AF_CJKAxisRec_
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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_CJK_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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/* used for horizontal metrics too for CJK */
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FT_Bool control_overshoot;
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FT_UInt blue_count;
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AF_CJKBlueRec blues[AF_BLUE_STRINGSET_MAX];
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FT_Fixed org_scale;
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FT_Pos org_delta;
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} AF_CJKAxisRec, *AF_CJKAxis;
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typedef struct AF_CJKMetricsRec_
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{
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AF_StyleMetricsRec root;
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FT_UInt units_per_em;
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AF_CJKAxisRec axis[AF_DIMENSION_MAX];
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} AF_CJKMetricsRec, *AF_CJKMetrics;
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#ifdef AF_CONFIG_OPTION_CJK
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FT_LOCAL( FT_Error )
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af_cjk_metrics_init( AF_CJKMetrics metrics,
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FT_Face face );
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FT_LOCAL( void )
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af_cjk_metrics_scale( AF_CJKMetrics metrics,
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AF_Scaler scaler );
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FT_LOCAL( FT_Error )
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af_cjk_hints_init( AF_GlyphHints hints,
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AF_CJKMetrics metrics );
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FT_LOCAL( FT_Error )
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af_cjk_hints_apply( FT_UInt glyph_index,
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AF_GlyphHints hints,
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FT_Outline* outline,
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AF_CJKMetrics metrics );
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/* shared; called from afindic.c */
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FT_LOCAL( void )
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af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
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FT_Face face );
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FT_LOCAL( void )
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af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
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FT_Face face );
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#endif /* AF_CONFIG_OPTION_CJK */
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/* */
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FT_END_HEADER
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#endif /* AFCJK_H_ */
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/* END */
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