| /***************************************************************************/ |
| /* */ |
| /* afhints.h */ |
| /* */ |
| /* Auto-fitter hinting routines (specification). */ |
| /* */ |
| /* Copyright 2003, 2004, 2005, 2006, 2007 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" |
| |
| #define xxAF_SORT_SEGMENTS |
| |
| 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 */ |
| FT_Short height; /* the hinted segment height */ |
| |
| 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 */ |
| FT_Pos len; /* 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; |
| #ifdef AF_SORT_SEGMENTS |
| FT_Int mid_segments; |
| #endif |
| |
| 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; |
| |
| FT_Pos xmin_delta; /* used for warping */ |
| FT_Pos xmax_delta; |
| |
| } AF_GlyphHintsRec; |
| |
| |
| #define AF_HINTS_TEST_SCALER( h, f ) ( (h)->scaler_flags & (f) ) |
| #define AF_HINTS_TEST_OTHER( h, f ) ( (h)->other_flags & (f) ) |
| |
| |
| #ifdef AF_DEBUG |
| |
| #define AF_HINTS_DO_HORIZONTAL( h ) \ |
| ( !_af_debug_disable_horz_hints && \ |
| !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_HORIZONTAL ) ) |
| |
| #define AF_HINTS_DO_VERTICAL( h ) \ |
| ( !_af_debug_disable_vert_hints && \ |
| !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 ) |
| |
| #define AF_HINTS_DO_BLUES( h ) ( !_af_debug_disable_blue_hints ) |
| |
| #else /* !AF_DEBUG */ |
| |
| #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 ) |
| |
| #define AF_HINTS_DO_BLUES( h ) 1 |
| |
| #endif /* !AF_DEBUG */ |
| |
| |
| 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, |
| AF_Direction dir, |
| 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_Bool get_inflections ); |
| |
| 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 ); |
| |
| /* */ |
| |
| #define AF_SEGMENT_LEN( seg ) ( (seg)->max_coord - (seg)->min_coord ) |
| |
| #define AF_SEGMENT_DIST( seg1, seg2 ) ( ( (seg1)->pos > (seg2)->pos ) \ |
| ? (seg1)->pos - (seg2)->pos \ |
| : (seg2)->pos - (seg1)->pos ) |
| |
| |
| FT_END_HEADER |
| |
| #endif /* __AFHINTS_H__ */ |
| |
| |
| /* END */ |
