4 * Copyright (C) 2011-2014 by Werner Lemberg.
6 * This file is part of the ttfautohint library, and may only be used,
7 * modified, and distributed under the terms given in `COPYING'. By
8 * continuing to use, modify, or distribute this file you indicate that you
9 * have read `COPYING' and understand and accept it fully.
11 * The file `COPYING' mentioned in the previous paragraph is distributed
12 * with the ttfautohint library.
20 TA_sfnt_compute_global_hints(SFNT
* sfnt
,
25 FT_Face face
= sfnt
->face
;
31 error
= FT_Select_Charmap(face
, FT_ENCODING_UNICODE
);
36 error
= FT_Select_Charmap(face
, FT_ENCODING_MS_SYMBOL
);
38 return TA_Err_Missing_Symbol_CMap
;
41 return TA_Err_Missing_Unicode_CMap
;
48 TA_FaceGlobals globals
= (TA_FaceGlobals
)sfnt
->face
->autohint
.data
;
49 TA_StyleClass style_class
= ta_style_classes
[style_idx
];
50 TA_ScriptClass script_class
= ta_script_classes
[style_class
->script
];
52 TA_StyleMetricsRec dummy
;
55 /* we don't have a `TA_Loader' object yet */
56 dummy
.globals
= globals
;
57 dummy
.style_class
= style_class
;
59 /* XXX: Extend this with a list of possible standard characters: */
60 /* Especially in non-default coverages, a single standard */
61 /* character may not be available. */
62 ta_get_char_index(&dummy
,
63 script_class
->standard_char
,
67 return TA_Err_Missing_Glyph
;
70 load_flags
= 1 << 29; /* vertical hinting only */
71 error
= ta_loader_load_glyph(font
, face
, glyph_index
, load_flags
);
78 TA_table_build_cvt(FT_Byte
** cvt
,
83 SFNT_Table
* glyf_table
= &font
->tables
[sfnt
->glyf_idx
];
84 glyf_Data
* data
= (glyf_Data
*)glyf_table
->data
;
103 /* checking multiple styles doesn't make sense for symbol fonts */
104 i_max
= font
->symbol
? 1 : TA_STYLE_MAX
;
106 /* loop over all styles and collect the relevant CVT data */
107 /* to compute the necessary array sizes and meta-information */
112 data
->num_used_styles
= 0;
114 for (i
= 0; i
< i_max
; i
++)
116 error
= TA_sfnt_compute_global_hints(sfnt
, font
, i
);
117 if (error
== TA_Err_Missing_Glyph
)
119 TA_FaceGlobals globals
= (TA_FaceGlobals
)sfnt
->face
->autohint
.data
;
120 FT_Byte
* gstyles
= globals
->glyph_styles
;
124 data
->style_ids
[i
] = 0xFFFFU
;
126 /* remove all references to this style; */
127 /* otherwise blue zones are computed later on, which we don't want */
128 for (nn
= 0; nn
< globals
->glyph_count
; nn
++)
130 if ((gstyles
[nn
] & ~TA_DIGIT
) == i
)
132 gstyles
[nn
] &= ~TA_STYLE_UNASSIGNED
;
133 gstyles
[nn
] |= globals
->font
->fallback_style
;
142 data
->style_ids
[i
] = data
->num_used_styles
++;
144 if (font
->loader
->hints
.metrics
->style_class
== &ta_none_dflt_style_class
)
148 /* XXX: generalize this to handle other metrics also */
149 haxis
= &((TA_LatinMetrics
)font
->loader
->hints
.metrics
)->axis
[0];
150 vaxis
= &((TA_LatinMetrics
)font
->loader
->hints
.metrics
)->axis
[1];
152 hwidth_count
+= haxis
->width_count
;
153 vwidth_count
+= vaxis
->width_count
;
154 /* there are two artificial blue zones at the end of the array */
155 /* that are not part of `vaxis->blue_count' */
156 blue_count
+= vaxis
->blue_count
+ 2;
160 /* exit if the font doesn't contain a single supported style */
161 if (!data
->num_used_styles
)
162 return TA_Err_Missing_Glyph
;
164 buf_len
= cvtl_max_runtime
/* runtime values 1 */
165 + data
->num_used_styles
/* runtime values 2 (for scaling) */
166 + 2 * data
->num_used_styles
/* runtime values 3 (blue data) */
167 + 2 * data
->num_used_styles
/* vert. and horiz. std. widths */
170 + 2 * blue_count
; /* round and flat blue zones */
171 buf_len
<<= 1; /* we have 16bit values */
173 /* buffer length must be a multiple of four */
174 len
= (buf_len
+ 3) & ~3;
175 buf
= (FT_Byte
*)malloc(len
);
177 return FT_Err_Out_Of_Memory
;
179 /* pad end of buffer with zeros */
187 * some CVT values are initialized (and modified) at runtime:
189 * (1) the `cvtl_xxx' values (see `tabytecode.h')
190 * (2) a scaling value for each style
191 * (3) offset and size of the vertical widths array
192 * (needed by `bci_{smooth,strong}_stem_width') for each style
194 for (i
= 0; i
< (cvtl_max_runtime
195 + data
->num_used_styles
196 + 2 * data
->num_used_styles
) * 2; i
++)
199 cvt_offset
= bufp
- buf
;
201 /* loop again over all styles and copy CVT data */
202 for (i
= 0; i
< i_max
; i
++)
204 /* collect offsets */
205 data
->cvt_offsets
[i
] = ((FT_UInt
)(bufp
- buf
) - cvt_offset
) >> 1;
207 error
= TA_sfnt_compute_global_hints(sfnt
, font
, i
);
208 if (error
== TA_Err_Missing_Glyph
)
213 if (font
->loader
->hints
.metrics
->style_class
== &ta_none_dflt_style_class
)
224 haxis
= &((TA_LatinMetrics
)font
->loader
->hints
.metrics
)->axis
[0];
225 vaxis
= &((TA_LatinMetrics
)font
->loader
->hints
.metrics
)->axis
[1];
227 hwidth_count
= haxis
->width_count
;
228 vwidth_count
= vaxis
->width_count
;
229 blue_count
= vaxis
->blue_count
+ 2; /* with artificial blue zones */
232 /* horizontal standard width */
233 if (hwidth_count
> 0)
235 *(bufp
++) = HIGH(haxis
->widths
[0].org
);
236 *(bufp
++) = LOW(haxis
->widths
[0].org
);
244 for (j
= 0; j
< hwidth_count
; j
++)
246 if (haxis
->widths
[j
].org
> 0xFFFF)
248 *(bufp
++) = HIGH(haxis
->widths
[j
].org
);
249 *(bufp
++) = LOW(haxis
->widths
[j
].org
);
252 /* vertical standard width */
253 if (vwidth_count
> 0)
255 *(bufp
++) = HIGH(vaxis
->widths
[0].org
);
256 *(bufp
++) = LOW(vaxis
->widths
[0].org
);
264 for (j
= 0; j
< vwidth_count
; j
++)
266 if (vaxis
->widths
[j
].org
> 0xFFFF)
268 *(bufp
++) = HIGH(vaxis
->widths
[j
].org
);
269 *(bufp
++) = LOW(vaxis
->widths
[j
].org
);
272 data
->cvt_blue_adjustment_offsets
[i
] = 0xFFFFU
;
274 for (j
= 0; j
< blue_count
; j
++)
276 if (vaxis
->blues
[j
].ref
.org
> 0xFFFF)
278 *(bufp
++) = HIGH(vaxis
->blues
[j
].ref
.org
);
279 *(bufp
++) = LOW(vaxis
->blues
[j
].ref
.org
);
282 for (j
= 0; j
< blue_count
; j
++)
284 if (vaxis
->blues
[j
].shoot
.org
> 0xFFFF)
286 *(bufp
++) = HIGH(vaxis
->blues
[j
].shoot
.org
);
287 *(bufp
++) = LOW(vaxis
->blues
[j
].shoot
.org
);
289 if (vaxis
->blues
[j
].flags
& TA_LATIN_BLUE_ADJUSTMENT
)
290 data
->cvt_blue_adjustment_offsets
[i
] = j
;
293 data
->cvt_horz_width_sizes
[i
] = hwidth_count
;
294 data
->cvt_vert_width_sizes
[i
] = vwidth_count
;
295 data
->cvt_blue_zone_sizes
[i
] = blue_count
;
305 return TA_Err_Hinter_Overflow
;
310 TA_sfnt_build_cvt_table(SFNT
* sfnt
,
315 SFNT_Table
* glyf_table
= &font
->tables
[sfnt
->glyf_idx
];
316 glyf_Data
* data
= (glyf_Data
*)glyf_table
->data
;
322 error
= TA_sfnt_add_table_info(sfnt
);
326 /* `glyf', `cvt', `fpgm', and `prep' are always used in parallel */
327 if (glyf_table
->processed
)
329 sfnt
->table_infos
[sfnt
->num_table_infos
- 1] = data
->cvt_idx
;
333 error
= TA_table_build_cvt(&cvt_buf
, &cvt_len
, sfnt
, font
);
337 /* in case of success, `cvt_buf' gets linked */
338 /* and is eventually freed in `TA_font_unload' */
339 error
= TA_font_add_table(font
,
340 &sfnt
->table_infos
[sfnt
->num_table_infos
- 1],
341 TTAG_cvt
, cvt_len
, cvt_buf
);
345 data
->cvt_idx
= sfnt
->table_infos
[sfnt
->num_table_infos
- 1];