1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
|
/***************************************************************************/
/* */
/* cf2hints.h */
/* */
/* Adobe's code for handling CFF hints (body). */
/* */
/* Copyright 2007-2013 Adobe Systems Incorporated. */
/* */
/* This software, and all works of authorship, whether in source or */
/* object code form as indicated by the copyright notice(s) included */
/* herein (collectively, the "Work") is made available, and may only be */
/* used, modified, and distributed under the FreeType Project License, */
/* LICENSE.TXT. Additionally, subject to the terms and conditions of the */
/* FreeType Project License, each contributor to the Work hereby grants */
/* to any individual or legal entity exercising permissions granted by */
/* the FreeType Project License and this section (hereafter, "You" or */
/* "Your") a perpetual, worldwide, non-exclusive, no-charge, */
/* royalty-free, irrevocable (except as stated in this section) patent */
/* license to make, have made, use, offer to sell, sell, import, and */
/* otherwise transfer the Work, where such license applies only to those */
/* patent claims licensable by such contributor that are necessarily */
/* infringed by their contribution(s) alone or by combination of their */
/* contribution(s) with the Work to which such contribution(s) was */
/* submitted. If You institute patent litigation against any entity */
/* (including a cross-claim or counterclaim in a lawsuit) alleging that */
/* the Work or a contribution incorporated within the Work constitutes */
/* direct or contributory patent infringement, then any patent licenses */
/* granted to You under this License for that Work shall terminate as of */
/* the date such litigation is filed. */
/* */
/* By using, modifying, or distributing the Work you indicate that you */
/* have read and understood the terms and conditions of the */
/* FreeType Project License as well as those provided in this section, */
/* and you accept them fully. */
/* */
/***************************************************************************/
#ifndef __CF2HINTS_H__
#define __CF2HINTS_H__
FT_BEGIN_HEADER
enum
{
CF2_MAX_HINTS = 96 /* maximum # of hints */
};
/*
* A HintMask object stores a bit mask that specifies which hints in the
* charstring are active at a given time. Hints in CFF must be declared
* at the start, before any drawing operators, with horizontal hints
* preceding vertical hints. The HintMask is ordered the same way, with
* horizontal hints immediately followed by vertical hints. Clients are
* responsible for knowing how many of each type are present.
*
* The maximum total number of hints is 96, as specified by the CFF
* specification.
*
* A HintMask is built 0 or more times while interpreting a charstring, by
* the HintMask operator. There is only one HintMask, but it is built or
* rebuilt each time there is a hint substitution (HintMask operator) in
* the charstring. A default HintMask with all bits set is built if there
* has been no HintMask operator prior to the first drawing operator.
*
*/
typedef struct CF2_HintMaskRec_
{
FT_Error* error;
FT_Bool isValid;
FT_Bool isNew;
size_t bitCount;
size_t byteCount;
FT_Byte mask[( CF2_MAX_HINTS + 7 ) / 8];
} CF2_HintMaskRec, *CF2_HintMask;
typedef struct CF2_StemHintRec_
{
FT_Bool used; /* DS positions are valid */
CF2_Fixed min; /* original character space value */
CF2_Fixed max;
CF2_Fixed minDS; /* DS position after first use */
CF2_Fixed maxDS;
} CF2_StemHintRec, *CF2_StemHint;
/*
* A HintMap object stores a piecewise linear function for mapping
* y-coordinates from character space to device space, providing
* appropriate pixel alignment to stem edges.
*
* The map is implemented as an array of `CF2_Hint' elements, each
* representing an edge. When edges are paired, as from stem hints, the
* bottom edge must immediately precede the top edge in the array.
* Element character space AND device space positions must both increase
* monotonically in the array. `CF2_Hint' elements are also used as
* parameters to `cf2_blues_capture'.
*
* The `cf2_hintmap_build' method must be called before any drawing
* operation (beginning with a Move operator) and at each hint
* substitution (HintMask operator).
*
* The `cf2_hintmap_map' method is called to transform y-coordinates at
* each drawing operation (move, line, curve).
*
*/
/* TODO: make this a CF2_ArrStack and add a deep copy method */
enum
{
CF2_MAX_HINT_EDGES = CF2_MAX_HINTS * 2
};
typedef struct CF2_HintMapRec_
{
CF2_Font font;
/* initial map based on blue zones */
struct CF2_HintMapRec_* initialHintMap;
/* working storage for 2nd pass adjustHints */
CF2_ArrStack hintMoves;
FT_Bool isValid;
FT_Bool hinted;
CF2_Fixed scale;
CF2_UInt count;
/* start search from this index */
CF2_UInt lastIndex;
CF2_HintRec edge[CF2_MAX_HINT_EDGES]; /* 192 */
} CF2_HintMapRec, *CF2_HintMap;
FT_LOCAL( FT_Bool )
cf2_hint_isValid( const CF2_Hint hint );
FT_LOCAL( FT_Bool )
cf2_hint_isTop( const CF2_Hint hint );
FT_LOCAL( FT_Bool )
cf2_hint_isBottom( const CF2_Hint hint );
FT_LOCAL( void )
cf2_hint_lock( CF2_Hint hint );
FT_LOCAL( void )
cf2_hintmap_init( CF2_HintMap hintmap,
CF2_Font font,
CF2_HintMap initialMap,
CF2_ArrStack hintMoves,
CF2_Fixed scale );
FT_LOCAL( void )
cf2_hintmap_build( CF2_HintMap hintmap,
CF2_ArrStack hStemHintArray,
CF2_ArrStack vStemHintArray,
CF2_HintMask hintMask,
CF2_Fixed hintOrigin,
FT_Bool initialMap );
/*
* GlyphPath is a wrapper for drawing operations that scales the
* coordinates according to the render matrix and HintMap. It also tracks
* open paths to control ClosePath and to insert MoveTo for broken fonts.
*
*/
typedef struct CF2_GlyphPathRec_
{
/* TODO: gather some of these into a hinting context */
CF2_Font font; /* font instance */
CF2_OutlineCallbacks callbacks; /* outline consumer */
CF2_HintMapRec hintMap; /* current hint map */
CF2_HintMapRec firstHintMap; /* saved copy */
CF2_HintMapRec initialHintMap; /* based on all captured hints */
CF2_ArrStackRec hintMoves; /* list of hint moves for 2nd pass */
CF2_Fixed scaleX; /* matrix a */
CF2_Fixed scaleC; /* matrix c */
CF2_Fixed scaleY; /* matrix d */
FT_Vector fractionalTranslation; /* including deviceXScale */
#if 0
CF2_Fixed hShift; /* character space horizontal shift */
/* (for fauxing) */
#endif
FT_Bool pathIsOpen; /* true after MoveTo */
FT_Bool pathIsClosing; /* true when synthesizing closepath line */
FT_Bool darken; /* true if stem darkening */
FT_Bool moveIsPending; /* true between MoveTo and offset MoveTo */
/* references used to call `cf2_hintmap_build', if necessary */
CF2_ArrStack hStemHintArray;
CF2_ArrStack vStemHintArray;
CF2_HintMask hintMask; /* ptr to the current mask */
CF2_Fixed hintOriginY; /* copy of current origin */
const CF2_BluesRec* blues;
CF2_Fixed xOffset; /* character space offsets */
CF2_Fixed yOffset;
/* character space miter limit threshold */
CF2_Fixed miterLimit;
/* vertical/horzizontal snap distance in character space */
CF2_Fixed snapThreshold;
FT_Vector offsetStart0; /* first and second points of first */
FT_Vector offsetStart1; /* element with offset applied */
/* current point, character space, before offset */
FT_Vector currentCS;
/* current point, device space */
FT_Vector currentDS;
/* start point of subpath, character space */
FT_Vector start;
/* the following members constitute the `queue' of one element */
FT_Bool elemIsQueued;
CF2_Int prevElemOp;
FT_Vector prevElemP0;
FT_Vector prevElemP1;
FT_Vector prevElemP2;
FT_Vector prevElemP3;
} CF2_GlyphPathRec, *CF2_GlyphPath;
FT_LOCAL( void )
cf2_glyphpath_init( CF2_GlyphPath glyphpath,
CF2_Font font,
CF2_OutlineCallbacks callbacks,
CF2_Fixed scaleY,
/* CF2_Fixed hShift, */
CF2_ArrStack hStemHintArray,
CF2_ArrStack vStemHintArray,
CF2_HintMask hintMask,
CF2_Fixed hintOrigin,
const CF2_Blues blues,
const FT_Vector* fractionalTranslation );
FT_LOCAL( void )
cf2_glyphpath_finalize( CF2_GlyphPath glyphpath );
FT_LOCAL( void )
cf2_glyphpath_moveTo( CF2_GlyphPath glyphpath,
CF2_Fixed x,
CF2_Fixed y );
FT_LOCAL( void )
cf2_glyphpath_lineTo( CF2_GlyphPath glyphpath,
CF2_Fixed x,
CF2_Fixed y );
FT_LOCAL( void )
cf2_glyphpath_curveTo( CF2_GlyphPath glyphpath,
CF2_Fixed x1,
CF2_Fixed y1,
CF2_Fixed x2,
CF2_Fixed y2,
CF2_Fixed x3,
CF2_Fixed y3 );
FT_LOCAL( void )
cf2_glyphpath_closeOpenPath( CF2_GlyphPath glyphpath );
FT_END_HEADER
#endif /* __CF2HINTS_H__ */
/* END */
|
