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+/***************************************************************************/
+/* */
+/* ahtypes.h */
+/* */
+/* General types and definitions for the auto-hint module */
+/* (specification only). */
+/* */
+/* Copyright 2000-2001, 2002, 2003, 2004 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
+
+
+ /*************************************************************************/
+ /* */
+ /* 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 ahangles.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). */
+ /* */
+ /* 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_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. */
+ /* */
+ /* min_coord :: The minimum coordinate of the segment. */
+ /* */
+ /* max_coord :: The maximum coordinate of the segment. */
+ /* */
+ /* 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. */
+ /* */
+ /* 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. */
+ /* */
+ typedef struct AH_SegmentRec_
+ {
+ AH_Edge_Flags flags;
+ AH_Direction dir;
+ 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_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 */
+
+ } 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> */
+ /* fpos :: The original edge position in font units. */
+ /* */
+ /* opos :: The original scaled edge position. */
+ /* */
+ /* pos :: The hinted edge position. */
+ /* */
+ /* flags :: The segment edge flags (straight, rounded, etc.). */
+ /* */
+ /* dir :: The main segment direction on this edge. */
+ /* */
+ /* scale :: Scaling factor between original and hinted edge */
+ /* positions. */
+ /* */
+ /* blue_edge :: Indicate the blue zone edge this edge is related to. */
+ /* Only set for some of the horizontal edges in a latin */
+ /* font. */
+ /* */
+ /* link :: The linked edge. */
+ /* */
+ /* serif :: The serif edge. */
+ /* */
+ /* num_linked :: The number of other edges that pair to this one. */
+ /* */
+ /* score :: Used to score the edge when selecting them. */
+ /* */
+ /* first :: The first edge segment. */
+ /* */
+ /* last :: The last edge segment. */
+ /* */
+ typedef struct AH_EdgeRec_
+ {
+ FT_Pos fpos;
+ FT_Pos opos;
+ FT_Pos pos;
+
+ AH_Edge_Flags flags;
+ AH_Direction dir;
+ FT_Fixed scale;
+ FT_Pos* blue_edge;
+
+ AH_Edge link;
+ AH_Edge serif;
+ FT_Int num_linked;
+
+ FT_Int score;
+
+ AH_Segment first;
+ AH_Segment last;
+
+
+ } 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;
+
+
+#ifdef FT_CONFIG_CHESTER_SMALL_F
+
+#define AH_BLUE_CAPITAL_TOP 0 /* THEZOCQS */
+#define AH_BLUE_CAPITAL_BOTTOM ( AH_BLUE_CAPITAL_TOP + 1 ) /* HEZLOCUS */
+#define AH_BLUE_SMALL_F_TOP ( AH_BLUE_CAPITAL_BOTTOM + 1 ) /* fijkdbh */
+#define AH_BLUE_SMALL_TOP ( AH_BLUE_SMALL_F_TOP + 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 )
+
+#else /* !FT_CONFIG_CHESTER_SMALL_F */
+
+#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 )
+
+#endif /* !FT_CONFIG_CHESTER_SMALL_F */
+
+ 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. */
+ /* */
+ /* stds :: A two-element array giving the default stem width */
+ /* and height. */
+ /* */
+ /* 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. */
+ /* */
+ /* control_overshoot :: */
+ /* Currently unused. */
+ /* */
+ 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; /* horizontal phantom points */
+ FT_Vector pp2;
+ /* we ignore vertical phantom points */
+
+ 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 */
+ FT_Bool do_stem_adjust; /* disable light stem 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 */
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