ref: 55ca4082886cbd698d8ac120fd351cb5f95c2ef4
dir: /src/autofit/afhints.h/
#ifndef __AFHINTS_H__
#define __AFHINTS_H__
#include "aftypes.h"
FT_BEGIN_HEADER
/*
* The definition of outline hints. These are shared by all
* script analysis routines
*
*/
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_
{
AF_Flags flags; /* point flags used by hinter */
FT_Pos ox, oy; /* original, scaled position */
FT_Pos 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_Direction in_dir; /* direction of inwards vector */
AF_Direction out_dir; /* direction of outwards vector */
AF_Point next; /* next point in contour */
AF_Point prev; /* previous point in contour */
} AF_PointRec;
typedef struct AF_SegmentRec_
{
AF_Edge_Flags flags; /* edge/segment flags for this segment */
AF_Direction dir; /* segment direction */
FT_Pos pos; /* position of segment */
FT_Pos min_coord; /* minimum coordinate of segment */
FT_Pos 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; /* link segment */
AF_Segment serif; /* primary segment for serifs */
FT_Pos num_linked; /* number of linked segments */
FT_Pos score;
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_Pos fpos; /* original, unscaled position (font units) */
FT_Pos opos; /* original, scaled position */
FT_Pos pos; /* current position */
AF_Edge_Flags flags; /* edge flags */
AF_Direction dir; /* edge direction */
FT_Fixed scale; /* used to speed up interpolation between edges */
FT_Pos* blue_edge; /* non-NULL if this is a blue edge */
AF_Edge link;
AF_Edge serif;
FT_Int num_linked;
FT_Int score;
AF_Segment first;
AF_Segment last;
} AF_EdgeRec;
typedef struct AF_AxisHintsRec_
{
FT_Int num_segments;
AF_Segment segments;
FT_Int num_edges;
AF_Edge edges;
AF_Direction major_dir;
} AF_AxisHintsRec, *AF_AxisHints;
typedef struct AF_OutlineHintsRec_
{
FT_Memory memory;
FT_Fixed x_scale;
FT_Fixed y_scale;
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 ];
} AF_OutlineHintsRec;
FT_LOCAL( AF_Direction )
af_direction_compute( FT_Pos dx,
FT_Pos dy );
FT_LOCAL( void )
af_outline_hints_init( AF_OutlineHints hints );
/* used to set the (u,v) fields of each AF_Point in a AF_OutlineHints
* object.
*/
typedef enum AH_UV_
{
AH_UV_FXY, /* (u,v) = (fx,fy) */
AH_UV_FYX, /* (u,v) = (fy,fx) */
AH_UV_OXY, /* (u,v) = (ox,oy) */
AH_UV_OYX, /* (u,v) = (oy,ox) */
AH_UV_OX, /* (u,v) = (ox,x) */
AH_UV_OY, /* (u,v) = (oy,y) */
AH_UV_YX, /* (u,v) = (y,x) */
AH_UV_XY /* (u,v) = (x,y) * should always be last! */
} AH_UV;
FT_LOCAL_DEF( void )
af_outline_hints_setup_uv( AF_OutlineHints hints,
AF_UV source );
/* recomputes all AF_Point in a AF_OutlineHints from the definitions
* in a source outline
*/
FT_LOCAL( FT_Error )
af_outline_hints_reset( AF_OutlineHints hints,
FT_Outline* outline,
FT_Fixed x_scale,
FT_Fixed y_scale );
FT_LOCAL( void )
af_outline_hints_done( AF_OutlineHints hints );
/* */
FT_END_HEADER
#endif /* __AFHINTS_H__ */