290 lines
9.7 KiB
C
290 lines
9.7 KiB
C
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#ifndef __AFTYPES_H__
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#define __AFTYPES_H__
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FT_BEGIN_HEADER
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** D E B U G G I N G *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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#define xxAF_DEBUG
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#ifdef AF_DEBUG
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# include <stdio.h>
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# define AF_LOG( x ) printf ## x
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#else
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# define AF_LOG( x ) do ; while ( 0 ) /* nothing */
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#endif /* AF_DEBUG */
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** A N G L E T Y P E S *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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/*
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* Angle type. The auto-fitter doesn't need a very high angular accuracy,
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* and this allows us to speed up some computations considerably with a
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* light Cordic algorithm (see afangle.c)
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*
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*/
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typedef FT_Int AF_Angle;
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#define AF_ANGLE_PI 128
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#define AF_ANGLE_2PI (AF_ANGLE_PI*2)
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#define AF_ANGLE_PI2 (AF_ANGLE_PI/2)
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#define AF_ANGLE_PI4 (AF_ANGLE_PI/4)
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/*
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* compute the angle of a given 2-D vector
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*
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*/
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FT_LOCAL( AF_Angle )
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af_angle( FT_Pos dx,
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FT_Pos dy );
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/*
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* computes "angle2 - angle1", the result is always within
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* the range [ -AF_ANGLE_PI .. AF_ANGLE_PI-1 ]
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*
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*/
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FT_LOCAL( AF_Angle )
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af_angle_diff( AF_Angle angle1,
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AF_Angle angle2 );
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** O U T L I N E S *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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typedef struct AF_OutlineHintsRec_* AF_OutlineHints;
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typedef struct AF_GlobalHintsRec_* AF_GlobalHints;
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typedef struct AF_OutlineRec_
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{
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FT_Memory memory;
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FT_Face face;
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FT_OutlineRec outline;
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FT_UInt outline_resolution;
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FT_Int advance;
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FT_UInt metrics_resolution;
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AF_OutlineHints hints;
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} AF_OutlineRec;
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** 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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* the following define global metrics in a _single_ dimension
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*
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* the "blue_refs" and "blue_shoots" arrays are ignored in
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* the horizontal dimension
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*/
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typedef struct AF_WidthRec_
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{
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FT_Pos org; /* original position/width in font units */
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FT_Pos cur; /* current/scaled position/width in device sub-pixels */
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FT_Pos fit; /* current/fitted position/width in device sub-pixels */
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} AF_WidthRec, *AF_Width;
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#define AF_MAX_WIDTHS 16
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#define AF_MAX_BLUES 32
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typedef struct AF_GlobalMetricsRec_
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{
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FT_Int num_widths;
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AF_WidthRec widths[ AF_MAX_WIDTHS ];
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FT_Fixed scale; /* used to scale from org to cur with: */
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FT_Pos delta; /* x_cur = x_org * scale + delta */
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/* ignored for horizontal metrics */
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AF_WidthRec blue_refs [ AF_MAX_BLUES ];
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AF_WidthRec blue_shoots[ AF_MAX_BLUES ];
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FT_Bool control_overshoot;
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} AF_GlobalMetricsRec, *AF_GlobalMetrics;
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** S C A L E R S *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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/*
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* A scaler models the target pixel device that will receive the
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* auto-hinted glyph image
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*
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*/
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typedef enum
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{
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AF_SCALER_FLAG_NO_HORIZONTAL = 1, /* disable horizontal hinting */
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AF_SCALER_FLAG_NO_VERTICAL = 2, /* disable vertical hinting */
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AF_SCALER_FLAG_NO_ADVANCE = 4 /* disable advance hinting */
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} AF_ScalerFlags;
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typedef struct AF_ScalerRec_
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{
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FT_Face face; /* source font face */
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FT_Fixed x_scale; /* from font units to 1/64th device pixels */
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FT_Fixed y_scale; /* from font units to 1/64th device pixels */
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FT_Pos x_delta; /* in 1/64th device pixels */
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FT_Pos y_delta; /* in 1/64th device pixels */
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FT_Render_Mode render_mode; /* monochrome, anti-aliased, LCD, etc.. */
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FT_UInt32 flags; /* additionnal control flags, see above */
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} AF_ScalerRec, *AF_Scaler;
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** S C R I P T S *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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/*
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* the list of know scripts. Each different script correspond to the
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* following information:
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*
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* - a set of Unicode ranges to test wether the face supports the
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* script
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*
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* - a specific global analyzer that will compute global metrics
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* specific to the script.
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*
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* - a specific hinting routine
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*
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* all scripts should share the same analysis routine though
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*/
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typedef enum
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{
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AF_SCRIPT_LATIN = 0,
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/* add new scripts here */
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AF_SCRIPT_MAX /* do not remove */
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} AF_Script;
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typedef struct AF_ScriptClassRec_ const* AF_ScriptClass;
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/*
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* root class for script-specific metrics
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*/
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typedef struct AF_ScriptMetricsRec_
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{
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AF_ScriptClass script_class;
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AF_GlobalMetricsRec horz_metrics;
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AF_GlobalMetricsRec vert_metrics;
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} AF_ScriptMetricsRec, *AF_ScriptMetrics;
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/* this function parses a FT_Face to compute global metrics for
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* a specific script
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*/
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typedef FT_Error (*AF_Script_InitMetricsFunc)( AF_ScriptMetrics metrics,
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FT_Face face );
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typedef void (*AF_Script_ScaleMetricsFunc)( AF_ScriptMetrics metrics,
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AF_Scaler scaler );
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typedef void (*AF_Script_DoneMetricsFunc)( AF_ScriptMetrics metrics );
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typedef FT_Error (*AF_Script_InitHintsFunc)( AF_OutlineHints hints,
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AF_Scaler scaler,
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AF_ScriptMetrics metrics );
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typedef void (*AF_Script_ApplyHintsFunc)( AF_OutlineHints hints );
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typedef struct AF_Script_UniRangeRec_
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{
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FT_UInt32 first;
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FT_UInt32 last;
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} AF_Script_UniRangeRec, *AF_Script_UniRange;
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typedef struct AF_ScriptClassRec_
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{
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AF_Script script;
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AF_Scipt_UniRange script_uni_ranges; /* last must be { 0, 0 } */
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FT_UInt script_metrics_size;
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AF_Script_InitMetricsFunc script_metrics_init;
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AF_Script_ScaleMetricsFunc script_metrics_scale;
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AF_Script_DoneMetricsFunc script_metrics_done;
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} AF_ScriptClassRec;
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/**************************************************************************/
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/**************************************************************************/
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/***** *****/
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/***** F A C E G L O B A L S *****/
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/***** *****/
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/**************************************************************************/
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/**************************************************************************/
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/*
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* models the global hints data for a given face, decomposed into
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* script-specific items..
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*
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*/
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typedef struct AF_FaceGlobalsRec_
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{
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FT_Face face;
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FT_UInt glyph_count; /* same as face->num_glyphs */
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FT_Byte* glyph_scripts; /* maps each gindex to a script */
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FT_ScriptMetrics metrics[ AF_SCRIPT_MAX ];
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} AF_FaceGlobalsRec, *AF_FaceGlobals;
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/* */
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FT_END_HEADER
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#endif /* __AFTYPES_H__ */
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