kc3-lang/freetype/src/autohint/ahtypes.h
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Hash : 31654e1b
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Date : 2002-09-24T23:39:58
2002-09-25 David Turner <david@freetype.org> * src/autohint/ahtypes.h: disabling metrics hinting in the auto-hinter. this produces much better anti-aliased text 2002-09-25 Anthony Fok <anthony@thizlinux.com> * src/sfnt/ttcmap0.c: added support for opens___.ttf (it contains a charmap that uses offset=0xFFFFU instead of 0x0000 to indicate a missing glyph)
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src/autohint/ahtypes.h
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/***************************************************************************/ /* */ /* 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 */