ref: 82a3f55c5fb7b9f7a82449e4eb943c535ec3e491
dir: /libfreetype/ahtypes.h/
/***************************************************************************/
/* */
/* ahtypes.h */
/* */
/* General types and definitions for the auto-hint module */
/* (specification only). */
/* */
/* Copyright 2000-2001, 2002 Catharon Productions Inc. */
/* Author: David Turner */
/* */
/* This file is part of the Catharon Typography Project and shall only */
/* be used, modified, and distributed under the terms of the Catharon */
/* Open Source License that should come with this file under the name */
/* `CatharonLicense.txt'. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/* Note that this license is compatible with the FreeType license. */
/* */
/***************************************************************************/
#ifndef __AHTYPES_H__
#define __AHTYPES_H__
#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H
#ifdef DEBUG_HINTER
#include <../src/autohint/ahloader.h>
#else
#include "ahloader.h"
#endif
#define xxAH_DEBUG
#ifdef AH_DEBUG
#include <stdio.h>
#define AH_LOG( x ) printf ## x
#else
#define AH_LOG( x ) do ; while ( 0 ) /* nothing */
#endif /* AH_DEBUG */
FT_BEGIN_HEADER
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** COMPILE-TIME BUILD OPTIONS ****/
/**** ****/
/**** Toggle these configuration macros to experiment with `features' ****/
/**** of the auto-hinter. ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* If this option is defined, only strong interpolation will be used to */
/* place the points between edges. Otherwise, `smooth' points are */
/* detected and later hinted through weak interpolation to correct some */
/* unpleasant artefacts. */
/* */
#undef AH_OPTION_NO_WEAK_INTERPOLATION
/*************************************************************************/
/* */
/* If this option is defined, only weak interpolation will be used to */
/* place the points between edges. Otherwise, `strong' points are */
/* detected and later hinted through strong interpolation to correct */
/* some unpleasant artefacts. */
/* */
#undef AH_OPTION_NO_STRONG_INTERPOLATION
/*************************************************************************/
/* */
/* Undefine this macro if you don't want to hint the metrics. There is */
/* no reason to do this (at least for non-CJK scripts), except for */
/* experimentation. */
/* */
#undef AH_HINT_METRICS
/*************************************************************************/
/* */
/* Define this macro if you do not want to insert extra edges at a */
/* glyph's x and y extremum (if there isn't one already available). */
/* This helps to reduce a number of artefacts and allows hinting of */
/* metrics. */
/* */
#undef AH_OPTION_NO_EXTREMUM_EDGES
/* don't touch for now */
#define AH_MAX_WIDTHS 12
#define AH_MAX_HEIGHTS 12
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** TYPE DEFINITIONS ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* see agangles.h */
typedef FT_Int AH_Angle;
/* hint flags */
#define AH_FLAG_NONE 0
/* bezier control points flags */
#define AH_FLAG_CONIC 1
#define AH_FLAG_CUBIC 2
#define AH_FLAG_CONTROL ( AH_FLAG_CONIC | AH_FLAG_CUBIC )
/* extrema flags */
#define AH_FLAG_EXTREMA_X 4
#define AH_FLAG_EXTREMA_Y 8
/* roundness */
#define AH_FLAG_ROUND_X 16
#define AH_FLAG_ROUND_Y 32
/* touched */
#define AH_FLAG_TOUCH_X 64
#define AH_FLAG_TOUCH_Y 128
/* weak interpolation */
#define AH_FLAG_WEAK_INTERPOLATION 256
#define AH_FLAG_INFLECTION 512
typedef FT_Int AH_Flags;
/* edge hint flags */
#define AH_EDGE_NORMAL 0
#define AH_EDGE_ROUND 1
#define AH_EDGE_SERIF 2
#define AH_EDGE_DONE 4
typedef FT_Int AH_Edge_Flags;
/* hint directions -- the values are computed so that two vectors are */
/* in opposite directions iff `dir1+dir2 == 0' */
#define AH_DIR_NONE 4
#define AH_DIR_RIGHT 1
#define AH_DIR_LEFT -1
#define AH_DIR_UP 2
#define AH_DIR_DOWN -2
typedef FT_Int AH_Direction;
typedef struct AH_PointRec_* AH_Point;
typedef struct AH_SegmentRec_* AH_Segment;
typedef struct AH_EdgeRec_* AH_Edge;
/*************************************************************************/
/* */
/* <Struct> */
/* AH_PointRec */
/* */
/* <Description> */
/* A structure used to model an outline point to the AH_OutlineRec */
/* type. */
/* */
/* <Fields> */
/* flags :: The current point hint flags. */
/* */
/* ox, oy :: The current original scaled coordinates. */
/* */
/* fx, fy :: The current coordinates in font units. */
/* */
/* x, y :: The current hinted coordinates. */
/* */
/* u, v :: Point coordinates -- meaning varies with context. */
/* */
/* in_dir :: The direction of the inwards vector (prev->point). */
/* */
/* out_dir :: The direction of the outwards vector (point->next). */
/* */
/* in_angle :: The angle of the inwards vector. */
/* */
/* out_angle :: The angle of the outwards vector. */
/* */
/* next :: The next point in same contour. */
/* */
/* prev :: The previous point in same contour. */
/* */
typedef struct AH_PointRec_
{
AH_Flags flags; /* point flags used by hinter */
FT_Pos ox, oy;
FT_Pos fx, fy;
FT_Pos x, y;
FT_Pos u, v;
AH_Direction in_dir; /* direction of inwards vector */
AH_Direction out_dir; /* direction of outwards vector */
AH_Angle in_angle;
AH_Angle out_angle;
AH_Point next; /* next point in contour */
AH_Point prev; /* previous point in contour */
} AH_PointRec;
/*************************************************************************/
/* */
/* <Struct> */
/* AH_SegmentRec */
/* */
/* <Description> */
/* A structure used to describe an edge segment to the auto-hinter. */
/* A segment is simply a sequence of successive points located on the */
/* same horizontal or vertical `position', in a given direction. */
/* */
/* <Fields> */
/* flags :: The segment edge flags (straight, rounded, etc.). */
/* */
/* dir :: The segment direction. */
/* */
/* first :: The first point in the segment. */
/* */
/* last :: The last point in the segment. */
/* */
/* contour :: A pointer to the first point of the segment's */
/* contour. */
/* */
/* pos :: The segment position in font units. */
/* */
/* size :: The segment size. */
/* */
/* edge :: The edge of the current segment. */
/* */
/* edge_next :: The next segment on the same edge. */
/* */
/* link :: The pairing segment for this edge. */
/* */
/* serif :: The primary segment for serifs. */
/* */
/* num_linked :: The number of other segments that link to this one. */
/* */
/* score :: Used to score the segment when selecting them. */
/* */
typedef struct AH_SegmentRec_
{
AH_Edge_Flags flags;
AH_Direction dir;
AH_Point first; /* first point in edge segment */
AH_Point last; /* last point in edge segment */
AH_Point* contour; /* ptr to first point of segment's contour */
FT_Pos pos; /* position of segment */
FT_Pos min_coord; /* minimum coordinate of segment */
FT_Pos max_coord; /* maximum coordinate of segment */
AH_Edge edge;
AH_Segment edge_next;
AH_Segment link; /* link segment */
AH_Segment serif; /* primary segment for serifs */
FT_Pos num_linked; /* number of linked segments */
FT_Pos score;
} AH_SegmentRec;
/*************************************************************************/
/* */
/* <Struct> */
/* AH_EdgeRec */
/* */
/* <Description> */
/* A structure used to describe an edge, which really is a horizontal */
/* or vertical coordinate to be hinted depending on the segments */
/* located on it. */
/* */
/* <Fields> */
/* flags :: The segment edge flags (straight, rounded, etc.). */
/* */
/* dir :: The main segment direction on this edge. */
/* */
/* first :: The first edge segment. */
/* */
/* last :: The last edge segment. */
/* */
/* fpos :: The original edge position in font units. */
/* */
/* opos :: The original scaled edge position. */
/* */
/* pos :: The hinted edge position. */
/* */
/* link :: The linked edge. */
/* */
/* serif :: The serif edge. */
/* */
/* num_paired :: The number of other edges that pair to this one. */
/* */
/* score :: Used to score the edge when selecting them. */
/* */
/* blue_edge :: Indicate the blue zone edge this edge is related to. */
/* Only set for some of the horizontal edges in a Latin */
/* font. */
/* */
typedef struct AH_EdgeRec_
{
AH_Edge_Flags flags;
AH_Direction dir;
AH_Segment first;
AH_Segment last;
FT_Pos fpos;
FT_Pos opos;
FT_Pos pos;
AH_Edge link;
AH_Edge serif;
FT_Int num_linked;
FT_Int score;
FT_Pos* blue_edge;
} AH_EdgeRec;
/* an outline as seen by the hinter */
typedef struct AH_OutlineRec_
{
FT_Memory memory;
AH_Direction vert_major_dir; /* vertical major direction */
AH_Direction horz_major_dir; /* horizontal major direction */
FT_Fixed x_scale;
FT_Fixed y_scale;
FT_Pos edge_distance_threshold;
FT_Int max_points;
FT_Int num_points;
AH_Point points;
FT_Int max_contours;
FT_Int num_contours;
AH_Point * contours;
FT_Int num_hedges;
AH_Edge horz_edges;
FT_Int num_vedges;
AH_Edge vert_edges;
FT_Int num_hsegments;
AH_Segment horz_segments;
FT_Int num_vsegments;
AH_Segment vert_segments;
} AH_OutlineRec, *AH_Outline;
#define AH_BLUE_CAPITAL_TOP 0 /* THEZOCQS */
#define AH_BLUE_CAPITAL_BOTTOM ( AH_BLUE_CAPITAL_TOP + 1 ) /* HEZLOCUS */
#define AH_BLUE_SMALL_TOP ( AH_BLUE_CAPITAL_BOTTOM + 1 ) /* xzroesc */
#define AH_BLUE_SMALL_BOTTOM ( AH_BLUE_SMALL_TOP + 1 ) /* xzroesc */
#define AH_BLUE_SMALL_MINOR ( AH_BLUE_SMALL_BOTTOM + 1 ) /* pqgjy */
#define AH_BLUE_MAX ( AH_BLUE_SMALL_MINOR + 1 )
typedef FT_Int AH_Blue;
#define AH_HINTER_MONOCHROME 1
#define AH_HINTER_OPTIMIZE 2
typedef FT_Int AH_Hinter_Flags;
/*************************************************************************/
/* */
/* <Struct> */
/* AH_GlobalsRec */
/* */
/* <Description> */
/* Holds the global metrics for a given font face (be it in design */
/* units or scaled pixel values). */
/* */
/* <Fields> */
/* num_widths :: The number of widths. */
/* */
/* num_heights :: The number of heights. */
/* */
/* widths :: Snap widths, including standard one. */
/* */
/* heights :: Snap height, including standard one. */
/* */
/* blue_refs :: The reference positions of blue zones. */
/* */
/* blue_shoots :: The overshoot positions of blue zones. */
/* */
typedef struct AH_GlobalsRec_
{
FT_Int num_widths;
FT_Int num_heights;
FT_Pos stds[2];
FT_Pos widths [AH_MAX_WIDTHS];
FT_Pos heights[AH_MAX_HEIGHTS];
FT_Pos blue_refs [AH_BLUE_MAX];
FT_Pos blue_shoots[AH_BLUE_MAX];
} AH_GlobalsRec, *AH_Globals;
/*************************************************************************/
/* */
/* <Struct> */
/* AH_Face_GlobalsRec */
/* */
/* <Description> */
/* Holds the complete global metrics for a given font face (i.e., the */
/* design units version + a scaled version + the current scales */
/* used). */
/* */
/* <Fields> */
/* face :: A handle to the source face object */
/* */
/* design :: The globals in font design units. */
/* */
/* scaled :: Scaled globals in sub-pixel values. */
/* */
/* x_scale :: The current horizontal scale. */
/* */
/* y_scale :: The current vertical scale. */
/* */
typedef struct AH_Face_GlobalsRec_
{
FT_Face face;
AH_GlobalsRec design;
AH_GlobalsRec scaled;
FT_Fixed x_scale;
FT_Fixed y_scale;
FT_Bool control_overshoot;
} AH_Face_GlobalsRec, *AH_Face_Globals;
typedef struct AH_HinterRec
{
FT_Memory memory;
AH_Hinter_Flags flags;
FT_Int algorithm;
FT_Face face;
AH_Face_Globals globals;
AH_Outline glyph;
AH_Loader loader;
FT_Vector pp1;
FT_Vector pp2;
FT_Bool transformed;
FT_Vector trans_delta;
FT_Matrix trans_matrix;
FT_Bool do_horz_hints; /* disable X hinting */
FT_Bool do_vert_hints; /* disable Y hinting */
FT_Bool do_horz_snapping; /* disable X stem size snapping */
FT_Bool do_vert_snapping; /* disable Y stem size snapping */
} AH_HinterRec, *AH_Hinter;
#ifdef DEBUG_HINTER
extern AH_Hinter ah_debug_hinter;
extern FT_Bool ah_debug_disable_horz;
extern FT_Bool ah_debug_disable_vert;
#else
#define ah_debug_disable_horz 0
#define ah_debug_disable_vert 0
#endif /* DEBUG_HINTER */
FT_END_HEADER
#endif /* __AHTYPES_H__ */
/* END */