/***************************************************************************/ /* */ /* afhints.h */ /* */ /* Auto-fitter hinting routines (specification). */ /* */ /* Copyright 2003, 2004, 2005 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 __AFHINTS_H__ #define __AFHINTS_H__ #include "aftypes.h" FT_BEGIN_HEADER /* * The definition of outline glyph hints. These are shared by all * script analysis routines (until now). */ typedef enum { AF_DIMENSION_HORZ = 0, /* x coordinates, */ /* i.e., vertical segments & edges */ AF_DIMENSION_VERT = 1, /* y coordinates, */ /* i.e., horizontal segments & edges */ AF_DIMENSION_MAX /* do not remove */ } AF_Dimension; /* hint directions -- the values are computed so that two vectors are */ /* in opposite directions iff `dir1 + dir2 == 0' */ typedef enum { AF_DIR_NONE = 4, AF_DIR_RIGHT = 1, AF_DIR_LEFT = -1, AF_DIR_UP = 2, AF_DIR_DOWN = -2 } AF_Direction; /* point hint flags */ typedef enum { AF_FLAG_NONE = 0, /* point type flags */ AF_FLAG_CONIC = 1 << 0, AF_FLAG_CUBIC = 1 << 1, AF_FLAG_CONTROL = AF_FLAG_CONIC | AF_FLAG_CUBIC, /* point extremum flags */ AF_FLAG_EXTREMA_X = 1 << 2, AF_FLAG_EXTREMA_Y = 1 << 3, /* point roundness flags */ AF_FLAG_ROUND_X = 1 << 4, AF_FLAG_ROUND_Y = 1 << 5, /* point touch flags */ AF_FLAG_TOUCH_X = 1 << 6, AF_FLAG_TOUCH_Y = 1 << 7, /* candidates for weak interpolation have this flag set */ AF_FLAG_WEAK_INTERPOLATION = 1 << 8, /* all inflection points in the outline have this flag set */ AF_FLAG_INFLECTION = 1 << 9 } AF_Flags; /* edge hint flags */ typedef enum { AF_EDGE_NORMAL = 0, AF_EDGE_ROUND = 1 << 0, AF_EDGE_SERIF = 1 << 1, AF_EDGE_DONE = 1 << 2 } AF_Edge_Flags; typedef struct AF_PointRec_* AF_Point; typedef struct AF_SegmentRec_* AF_Segment; typedef struct AF_EdgeRec_* AF_Edge; typedef struct AF_PointRec_ { FT_UShort flags; /* point flags used by hinter */ FT_Char in_dir; /* direction of inwards vector */ FT_Char out_dir; /* direction of outwards vector */ FT_Pos ox, oy; /* original, scaled position */ FT_Short fx, fy; /* original, unscaled position (font units) */ FT_Pos x, y; /* current position */ FT_Pos u, v; /* current (x,y) or (y,x) depending on context */ AF_Point next; /* next point in contour */ AF_Point prev; /* previous point in contour */ } AF_PointRec; typedef struct AF_SegmentRec_ { FT_Byte flags; /* edge/segment flags for this segment */ FT_Char dir; /* segment direction */ FT_Short pos; /* position of segment */ FT_Short min_coord; /* minimum coordinate of segment */ FT_Short max_coord; /* maximum coordinate of segment */ AF_Edge edge; /* the segment's parent edge */ AF_Segment edge_next; /* link to next segment in parent edge */ AF_Segment link; /* (stem) link segment */ AF_Segment serif; /* primary segment for serifs */ FT_Pos num_linked; /* number of linked segments */ FT_Pos score; /* used during stem matching */ AF_Point first; /* first point in edge segment */ AF_Point last; /* last point in edge segment */ AF_Point* contour; /* ptr to first point of segment's contour */ } AF_SegmentRec; typedef struct AF_EdgeRec_ { FT_Short fpos; /* original, unscaled position (font units) */ FT_Pos opos; /* original, scaled position */ FT_Pos pos; /* current position */ FT_Byte flags; /* edge flags */ FT_Char dir; /* edge direction */ FT_Fixed scale; /* used to speed up interpolation between edges */ AF_Width blue_edge; /* non-NULL if this is a blue edge */ AF_Edge link; AF_Edge serif; FT_Short num_linked; FT_Int score; AF_Segment first; AF_Segment last; } AF_EdgeRec; typedef struct AF_AxisHintsRec_ { FT_Int num_segments; FT_Int max_segments; AF_Segment segments; FT_Int num_edges; FT_Int max_edges; AF_Edge edges; AF_Direction major_dir; } AF_AxisHintsRec, *AF_AxisHints; typedef struct AF_GlyphHintsRec_ { FT_Memory memory; FT_Fixed x_scale; FT_Pos x_delta; FT_Fixed y_scale; FT_Pos y_delta; FT_Pos edge_distance_threshold; FT_Int max_points; FT_Int num_points; AF_Point points; FT_Int max_contours; FT_Int num_contours; AF_Point* contours; AF_AxisHintsRec axis[AF_DIMENSION_MAX]; FT_UInt32 scaler_flags; /* copy of scaler flags */ FT_UInt32 other_flags; /* free for script-specific */ /* implementations */ AF_ScriptMetrics metrics; } AF_GlyphHintsRec; #define AF_HINTS_TEST_SCALER( h, f ) ( (h)->scaler_flags & (f) ) #define AF_HINTS_TEST_OTHER( h, f ) ( (h)->other_flags & (f) ) #define AF_HINTS_DO_HORIZONTAL( h ) \ !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_HORIZONTAL ) #define AF_HINTS_DO_VERTICAL( h ) \ !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_VERTICAL ) #define AF_HINTS_DO_ADVANCE( h ) \ !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_ADVANCE ) FT_LOCAL( AF_Direction ) af_direction_compute( FT_Pos dx, FT_Pos dy ); FT_LOCAL( FT_Error ) af_axis_hints_new_segment( AF_AxisHints axis, FT_Memory memory, AF_Segment *asegment ); FT_LOCAL( FT_Error) af_axis_hints_new_edge( AF_AxisHints axis, FT_Int fpos, FT_Memory memory, AF_Edge *edge ); FT_LOCAL( void ) af_glyph_hints_init( AF_GlyphHints hints, FT_Memory memory ); /* * recompute all AF_Point in a AF_GlyphHints from the definitions * in a source outline */ FT_LOCAL( void ) af_glyph_hints_rescale( AF_GlyphHints hints, AF_ScriptMetrics metrics ); FT_LOCAL( FT_Error ) af_glyph_hints_reload( AF_GlyphHints hints, FT_Outline* outline ); FT_LOCAL( void ) af_glyph_hints_save( AF_GlyphHints hints, FT_Outline* outline ); FT_LOCAL( void ) af_glyph_hints_align_edge_points( AF_GlyphHints hints, AF_Dimension dim ); FT_LOCAL( void ) af_glyph_hints_align_strong_points( AF_GlyphHints hints, AF_Dimension dim ); FT_LOCAL( void ) af_glyph_hints_align_weak_points( AF_GlyphHints hints, AF_Dimension dim ); #ifdef AF_USE_WARPER FT_LOCAL( void ) af_glyph_hints_scale_dim( AF_GlyphHints hints, AF_Dimension dim, FT_Fixed scale, FT_Pos delta ); #endif FT_LOCAL( void ) af_glyph_hints_done( AF_GlyphHints hints ); /* */ FT_END_HEADER #endif /* __AFHINTS_H__ */ /* END */