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authorDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
committerDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
commitc6101f91d071883b48b1b4b51e5eba0f36d9a78d (patch)
tree1bf7f5a881d7a4f5c5bf59d0b2821943dd822372 /Build/source/libs/freetype2/freetype-src/src/autofit/afhints.h
parent07ee7222e389b0777456b427a55c22d0e6ffd267 (diff)
French translation for tlmgr updated
git-svn-id: svn://tug.org/texlive/trunk@57912 c570f23f-e606-0410-a88d-b1316a301751
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-/****************************************************************************
- *
- * afhints.h
- *
- * Auto-fitter hinting routines (specification).
- *
- * Copyright (C) 2003-2020 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
- * writing system analysis routines (until now).
- */
-
- typedef enum AF_Dimension_
- {
- 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_Direction_
- {
- AF_DIR_NONE = 4,
- AF_DIR_RIGHT = 1,
- AF_DIR_LEFT = -1,
- AF_DIR_UP = 2,
- AF_DIR_DOWN = -2
-
- } AF_Direction;
-
-
- /*
- * The following explanations are mostly taken from the article
- *
- * Real-Time Grid Fitting of Typographic Outlines
- *
- * by David Turner and Werner Lemberg
- *
- * https://www.tug.org/TUGboat/Articles/tb24-3/lemberg.pdf
- *
- * with appropriate updates.
- *
- *
- * Segments
- *
- * `af_{cjk,latin,...}_hints_compute_segments' are the functions to
- * find segments in an outline.
- *
- * A segment is a series of at least two consecutive points that are
- * approximately aligned along a coordinate axis. The analysis to do
- * so is specific to a writing system.
- *
- *
- * Edges
- *
- * `af_{cjk,latin,...}_hints_compute_edges' are the functions to find
- * edges.
- *
- * As soon as segments are defined, the auto-hinter groups them into
- * edges. An edge corresponds to a single position on the main
- * dimension that collects one or more segments (allowing for a small
- * threshold).
- *
- * As an example, the `latin' writing system first tries to grid-fit
- * edges, then to align segments on the edges unless it detects that
- * they form a serif.
- *
- *
- * A H
- * | |
- * | |
- * | |
- * | |
- * C | | F
- * +------<-----+ +-----<------+
- * | B G |
- * | |
- * | |
- * +--------------->------------------+
- * D E
- *
- *
- * Stems
- *
- * Stems are detected by `af_{cjk,latin,...}_hint_edges'.
- *
- * Segments need to be `linked' to other ones in order to detect stems.
- * A stem is made of two segments that face each other in opposite
- * directions and that are sufficiently close to each other. Using
- * vocabulary from the TrueType specification, stem segments form a
- * `black distance'.
- *
- * In the above ASCII drawing, the horizontal segments are BC, DE, and
- * FG; the vertical segments are AB, CD, EF, and GH.
- *
- * Each segment has at most one `best' candidate to form a black
- * distance, or no candidate at all. Notice that two distinct segments
- * can have the same candidate, which frequently means a serif.
- *
- * A stem is recognized by the following condition:
- *
- * best segment_1 = segment_2 && best segment_2 = segment_1
- *
- * The best candidate is stored in field `link' in structure
- * `AF_Segment'.
- *
- * In the above ASCII drawing, the best candidate for both AB and CD is
- * GH, while the best candidate for GH is AB. Similarly, the best
- * candidate for EF and GH is AB, while the best candidate for AB is
- * GH.
- *
- * The detection and handling of stems is dependent on the writing
- * system.
- *
- *
- * Serifs
- *
- * Serifs are detected by `af_{cjk,latin,...}_hint_edges'.
- *
- * In comparison to a stem, a serif (as handled by the auto-hinter
- * module that takes care of the `latin' writing system) has
- *
- * best segment_1 = segment_2 && best segment_2 != segment_1
- *
- * where segment_1 corresponds to the serif segment (CD and EF in the
- * above ASCII drawing).
- *
- * The best candidate is stored in field `serif' in structure
- * `AF_Segment' (and `link' is set to NULL).
- *
- *
- * Touched points
- *
- * A point is called `touched' if it has been processed somehow by the
- * auto-hinter. It basically means that it shouldn't be moved again
- * (or moved only under certain constraints to preserve the already
- * applied processing).
- *
- *
- * Flat and round segments
- *
- * Segments are `round' or `flat', depending on the series of points
- * that define them. A segment is round if the next and previous point
- * of an extremum (which can be either a single point or sequence of
- * points) are both conic or cubic control points. Otherwise, a
- * segment with an extremum is flat.
- *
- *
- * Strong Points
- *
- * Experience has shown that points not part of an edge need to be
- * interpolated linearly between their two closest edges, even if these
- * are not part of the contour of those particular points. Typical
- * candidates for this are
- *
- * - angle points (i.e., points where the `in' and `out' direction
- * differ greatly)
- *
- * - inflection points (i.e., where the `in' and `out' angles are the
- * same, but the curvature changes sign) [currently, such points
- * aren't handled specially in the auto-hinter]
- *
- * `af_glyph_hints_align_strong_points' is the function that takes
- * care of such situations; it is equivalent to the TrueType `IP'
- * hinting instruction.
- *
- *
- * Weak Points
- *
- * Other points in the outline must be interpolated using the
- * coordinates of their previous and next unfitted contour neighbours.
- * These are called `weak points' and are touched by the function
- * `af_glyph_hints_align_weak_points', equivalent to the TrueType `IUP'
- * hinting instruction. Typical candidates are control points and
- * points on the contour without a major direction.
- *
- * The major effect is to reduce possible distortion caused by
- * alignment of edges and strong points, thus weak points are processed
- * after strong points.
- */
-
-
- /* point hint flags */
-#define AF_FLAG_NONE 0
-
- /* point type flags */
-#define AF_FLAG_CONIC ( 1U << 0 )
-#define AF_FLAG_CUBIC ( 1U << 1 )
-#define AF_FLAG_CONTROL ( AF_FLAG_CONIC | AF_FLAG_CUBIC )
-
- /* point touch flags */
-#define AF_FLAG_TOUCH_X ( 1U << 2 )
-#define AF_FLAG_TOUCH_Y ( 1U << 3 )
-
- /* candidates for weak interpolation have this flag set */
-#define AF_FLAG_WEAK_INTERPOLATION ( 1U << 4 )
-
- /* the distance to the next point is very small */
-#define AF_FLAG_NEAR ( 1U << 5 )
-
-
- /* edge hint flags */
-#define AF_EDGE_NORMAL 0
-#define AF_EDGE_ROUND ( 1U << 0 )
-#define AF_EDGE_SERIF ( 1U << 1 )
-#define AF_EDGE_DONE ( 1U << 2 )
-#define AF_EDGE_NEUTRAL ( 1U << 3 ) /* edge aligns to a neutral blue zone */
-
-
- 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 (in 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 */
-
-#ifdef FT_DEBUG_AUTOFIT
- /* track `before' and `after' edges for strong points */
- AF_Edge before[2];
- AF_Edge after[2];
-#endif
-
- } 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 delta; /* deviation from segment position */
- 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 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_SegmentRec;
-
-
- typedef struct AF_EdgeRec_
- {
- FT_Short fpos; /* original, unscaled position (in 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; /* link edge */
- AF_Edge serif; /* primary edge for serifs */
- FT_Int score; /* used during stem matching */
-
- AF_Segment first; /* first segment in edge */
- AF_Segment last; /* last segment in edge */
-
- } AF_EdgeRec;
-
-#define AF_SEGMENTS_EMBEDDED 18 /* number of embedded segments */
-#define AF_EDGES_EMBEDDED 12 /* number of embedded edges */
-
- typedef struct AF_AxisHintsRec_
- {
- FT_Int num_segments; /* number of used segments */
- FT_Int max_segments; /* number of allocated segments */
- AF_Segment segments; /* segments array */
-#ifdef AF_SORT_SEGMENTS
- FT_Int mid_segments;
-#endif
-
- FT_Int num_edges; /* number of used edges */
- FT_Int max_edges; /* number of allocated edges */
- AF_Edge edges; /* edges array */
-
- AF_Direction major_dir; /* either vertical or horizontal */
-
- /* two arrays to avoid allocation penalty */
- struct
- {
- AF_SegmentRec segments[AF_SEGMENTS_EMBEDDED];
- AF_EdgeRec edges[AF_EDGES_EMBEDDED];
- } embedded;
-
-
- } AF_AxisHintsRec, *AF_AxisHints;
-
-
-#define AF_POINTS_EMBEDDED 96 /* number of embedded points */
-#define AF_CONTOURS_EMBEDDED 8 /* number of embedded contours */
-
- typedef struct AF_GlyphHintsRec_
- {
- FT_Memory memory;
-
- FT_Fixed x_scale;
- FT_Pos x_delta;
-
- FT_Fixed y_scale;
- FT_Pos y_delta;
-
- FT_Int max_points; /* number of allocated points */
- FT_Int num_points; /* number of used points */
- AF_Point points; /* points array */
-
- FT_Int max_contours; /* number of allocated contours */
- FT_Int num_contours; /* number of used contours */
- AF_Point* contours; /* contours array */
-
- AF_AxisHintsRec axis[AF_DIMENSION_MAX];
-
- FT_UInt32 scaler_flags; /* copy of scaler flags */
- FT_UInt32 other_flags; /* free for style-specific */
- /* implementations */
- AF_StyleMetrics metrics;
-
- FT_Pos xmin_delta; /* used for warping */
- FT_Pos xmax_delta;
-
- /* Two arrays to avoid allocation penalty. */
- /* The `embedded' structure must be the last element! */
- struct
- {
- AF_Point contours[AF_CONTOURS_EMBEDDED];
- AF_PointRec points[AF_POINTS_EMBEDDED];
- } embedded;
-
- } 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 FT_DEBUG_AUTOFIT
-
-#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_BLUES( h ) ( !_af_debug_disable_blue_hints )
-
-#else /* !FT_DEBUG_AUTOFIT */
-
-#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_BLUES( h ) 1
-
-#endif /* !FT_DEBUG_AUTOFIT */
-
-
-#define AF_HINTS_DO_ADVANCE( h ) \
- !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_ADVANCE )
-
-#define AF_HINTS_DO_WARP( h ) \
- !AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_WARPER )
-
-
-
- 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_Bool top_to_bottom_hinting,
- FT_Memory memory,
- AF_Edge *edge );
-
- FT_LOCAL( void )
- af_glyph_hints_init( AF_GlyphHints hints,
- FT_Memory memory );
-
- FT_LOCAL( void )
- af_glyph_hints_rescale( AF_GlyphHints hints,
- AF_StyleMetrics 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_CONFIG_OPTION_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 */