/***************************************************************************/
/* */
/* afcjk.h */
/* */
/* Auto-fitter hinting routines for CJK writing system (specification). */
/* */
/* Copyright 2006-2017 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 AFCJK_H_
#define AFCJK_H_
#include "afhints.h"
#include "aflatin.h"
FT_BEGIN_HEADER
/* the CJK-specific writing system */
AF_DECLARE_WRITING_SYSTEM_CLASS( af_cjk_writing_system_class )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** C J K G L O B A L M E T R I C S *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*
* CJK glyphs tend to fill the square. So we have both vertical and
* horizontal blue zones. But some glyphs have flat bounding strokes that
* leave some space between neighbour glyphs.
*/
#define AF_CJK_IS_TOP_BLUE( b ) \
( (b)->properties & AF_BLUE_PROPERTY_CJK_TOP )
#define AF_CJK_IS_HORIZ_BLUE( b ) \
( (b)->properties & AF_BLUE_PROPERTY_CJK_HORIZ )
#define AF_CJK_IS_RIGHT_BLUE AF_CJK_IS_TOP_BLUE
#define AF_CJK_MAX_WIDTHS 16
#define AF_CJK_BLUE_ACTIVE ( 1U << 0 ) /* zone height is <= 3/4px */
#define AF_CJK_BLUE_TOP ( 1U << 1 ) /* result of AF_CJK_IS_TOP_BLUE */
#define AF_CJK_BLUE_ADJUSTMENT ( 1U << 2 ) /* used for scale adjustment */
/* optimization */
typedef struct AF_CJKBlueRec_
{
AF_WidthRec ref;
AF_WidthRec shoot; /* undershoot */
FT_UInt flags;
} AF_CJKBlueRec, *AF_CJKBlue;
typedef struct AF_CJKAxisRec_
{
FT_Fixed scale;
FT_Pos delta;
FT_UInt width_count; /* number of used widths */
AF_WidthRec widths[AF_CJK_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? */
/* used for horizontal metrics too for CJK */
FT_Bool control_overshoot;
FT_UInt blue_count;
AF_CJKBlueRec blues[AF_BLUE_STRINGSET_MAX];
FT_Fixed org_scale;
FT_Pos org_delta;
} AF_CJKAxisRec, *AF_CJKAxis;
typedef struct AF_CJKMetricsRec_
{
AF_StyleMetricsRec root;
FT_UInt units_per_em;
AF_CJKAxisRec axis[AF_DIMENSION_MAX];
} AF_CJKMetricsRec, *AF_CJKMetrics;
#ifdef AF_CONFIG_OPTION_CJK
FT_LOCAL( FT_Error )
af_cjk_metrics_init( AF_CJKMetrics metrics,
FT_Face face );
FT_LOCAL( void )
af_cjk_metrics_scale( AF_CJKMetrics metrics,
AF_Scaler scaler );
FT_LOCAL( FT_Error )
af_cjk_hints_init( AF_GlyphHints hints,
AF_CJKMetrics metrics );
FT_LOCAL( FT_Error )
af_cjk_hints_apply( FT_UInt glyph_index,
AF_GlyphHints hints,
FT_Outline* outline,
AF_CJKMetrics metrics );
/* shared; called from afindic.c */
FT_LOCAL( void )
af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
FT_Face face );
FT_LOCAL( void )
af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
FT_Face face );
#endif /* AF_CONFIG_OPTION_CJK */
/* */
FT_END_HEADER
#endif /* AFCJK_H_ */
/* END */
