47 |
46 |
48 |
47 |
49 struct LongMetric |
48 struct LongMetric |
50 { |
49 { |
51 UFWORD advance; /* Advance width/height. */ |
50 UFWORD advance; /* Advance width/height. */ |
52 FWORD lsb; /* Leading (left/top) side bearing. */ |
51 FWORD sb; /* Leading (left/top) side bearing. */ |
53 public: |
52 public: |
54 DEFINE_SIZE_STATIC (4); |
53 DEFINE_SIZE_STATIC (4); |
55 }; |
54 }; |
56 |
55 |
57 template <typename T, typename H> |
56 template <typename T, typename H> |
58 struct hmtxvmtx |
57 struct hmtxvmtx |
59 { |
58 { |
60 inline bool sanitize (hb_sanitize_context_t *c) const |
59 bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const |
61 { |
60 { |
62 TRACE_SANITIZE (this); |
61 TRACE_SANITIZE (this); |
63 /* We don't check for anything specific here. The users of the |
62 /* We don't check for anything specific here. The users of the |
64 * struct do all the hard work... */ |
63 * struct do all the hard work... */ |
65 return_trace (true); |
64 return_trace (true); |
66 } |
65 } |
67 |
66 |
68 |
67 |
69 inline bool subset_update_header (hb_subset_plan_t *plan, |
68 bool subset_update_header (hb_subset_plan_t *plan, |
70 unsigned int num_hmetrics) const |
69 unsigned int num_hmetrics) const |
71 { |
70 { |
72 hb_blob_t *src_blob = OT::Sanitizer<H> ().sanitize (plan->source->reference_table (H::tableTag)); |
71 hb_blob_t *src_blob = hb_sanitize_context_t ().reference_table<H> (plan->source, H::tableTag); |
73 hb_blob_t *dest_blob = hb_blob_copy_writable_or_fail(src_blob); |
72 hb_blob_t *dest_blob = hb_blob_copy_writable_or_fail (src_blob); |
74 hb_blob_destroy (src_blob); |
73 hb_blob_destroy (src_blob); |
75 |
74 |
76 if (unlikely (!dest_blob)) { |
75 if (unlikely (!dest_blob)) { |
77 return false; |
76 return false; |
78 } |
77 } |
85 hb_blob_destroy (dest_blob); |
84 hb_blob_destroy (dest_blob); |
86 |
85 |
87 return result; |
86 return result; |
88 } |
87 } |
89 |
88 |
90 inline bool subset (hb_subset_plan_t *plan) const |
89 bool subset (hb_subset_plan_t *plan) const |
91 { |
90 { |
92 typename T::accelerator_t _mtx; |
91 typename T::accelerator_t _mtx; |
93 _mtx.init (plan->source); |
92 _mtx.init (plan->source); |
94 |
93 |
95 /* All the trailing glyphs with the same advance can use one LongMetric |
94 /* All the trailing glyphs with the same advance can use one LongMetric |
96 * and just keep LSB */ |
95 * and just keep LSB */ |
97 hb_vector_t<hb_codepoint_t> &gids = plan->glyphs; |
96 hb_vector_t<hb_codepoint_t> &gids = plan->glyphs; |
98 unsigned int num_advances = gids.len; |
97 unsigned int num_advances = gids.length; |
99 unsigned int last_advance = _mtx.get_advance (gids[num_advances - 1]); |
98 unsigned int last_advance = _mtx.get_advance (gids[num_advances - 1]); |
100 while (num_advances > 1 |
99 while (num_advances > 1 && |
101 && last_advance == _mtx.get_advance (gids[num_advances - 2])) |
100 last_advance == _mtx.get_advance (gids[num_advances - 2])) |
102 { |
101 { |
103 num_advances--; |
102 num_advances--; |
104 } |
103 } |
105 |
104 |
106 /* alloc the new table */ |
105 /* alloc the new table */ |
107 size_t dest_sz = num_advances * 4 |
106 size_t dest_sz = num_advances * 4 |
108 + (gids.len - num_advances) * 2; |
107 + (gids.length - num_advances) * 2; |
109 void *dest = (void *) malloc (dest_sz); |
108 void *dest = (void *) malloc (dest_sz); |
110 if (unlikely (!dest)) |
109 if (unlikely (!dest)) |
111 { |
110 { |
112 return false; |
111 return false; |
113 } |
112 } |
114 DEBUG_MSG(SUBSET, nullptr, "%c%c%c%c in src has %d advances, %d lsbs", HB_UNTAG(T::tableTag), _mtx.num_advances, _mtx.num_metrics - _mtx.num_advances); |
113 DEBUG_MSG(SUBSET, nullptr, "%c%c%c%c in src has %d advances, %d lsbs", HB_UNTAG(T::tableTag), _mtx.num_advances, _mtx.num_metrics - _mtx.num_advances); |
115 DEBUG_MSG(SUBSET, nullptr, "%c%c%c%c in dest has %d advances, %d lsbs, %u bytes", HB_UNTAG(T::tableTag), num_advances, gids.len - num_advances, (unsigned int) dest_sz); |
114 DEBUG_MSG(SUBSET, nullptr, "%c%c%c%c in dest has %d advances, %d lsbs, %u bytes", HB_UNTAG(T::tableTag), num_advances, gids.length - num_advances, (unsigned int) dest_sz); |
116 |
115 |
117 const char *source_table = hb_blob_get_data (_mtx.blob, nullptr); |
116 const char *source_table = hb_blob_get_data (_mtx.table.get_blob (), nullptr); |
118 // Copy everything over |
117 // Copy everything over |
119 LongMetric * old_metrics = (LongMetric *) source_table; |
118 LongMetric * old_metrics = (LongMetric *) source_table; |
120 FWORD *lsbs = (FWORD *) (old_metrics + _mtx.num_advances); |
119 FWORD *lsbs = (FWORD *) (old_metrics + _mtx.num_advances); |
121 char * dest_pos = (char *) dest; |
120 char * dest_pos = (char *) dest; |
122 |
121 |
123 bool failed = false; |
122 bool failed = false; |
124 for (unsigned int i = 0; i < gids.len; i++) |
123 for (unsigned int i = 0; i < gids.length; i++) |
125 { |
124 { |
126 /* the last metric or the one for gids[i] */ |
125 /* the last metric or the one for gids[i] */ |
127 LongMetric *src_metric = old_metrics + MIN ((hb_codepoint_t) _mtx.num_advances - 1, gids[i]); |
126 LongMetric *src_metric = old_metrics + MIN ((hb_codepoint_t) _mtx.num_advances - 1, gids[i]); |
128 if (gids[i] < _mtx.num_advances) |
127 if (gids[i] < _mtx.num_advances) |
129 { |
128 { |
146 DEBUG_MSG(SUBSET, nullptr, "gid %d is >= number of source metrics %d", |
145 DEBUG_MSG(SUBSET, nullptr, "gid %d is >= number of source metrics %d", |
147 gids[i], _mtx.num_metrics); |
146 gids[i], _mtx.num_metrics); |
148 failed = true; |
147 failed = true; |
149 break; |
148 break; |
150 } |
149 } |
151 FWORD src_lsb = *(lsbs + gids[i] - _mtx.num_advances); |
150 FWORD src_sb = *(lsbs + gids[i] - _mtx.num_advances); |
152 if (i < num_advances) |
151 if (i < num_advances) |
153 { |
152 { |
154 /* dest needs a full LongMetric */ |
153 /* dest needs a full LongMetric */ |
155 LongMetric *metric = (LongMetric *)dest_pos; |
154 LongMetric *metric = (LongMetric *)dest_pos; |
156 metric->advance = src_metric->advance; |
155 metric->advance = src_metric->advance; |
157 metric->lsb = src_lsb; |
156 metric->sb = src_sb; |
158 } |
157 } |
159 else |
158 else |
160 { |
159 { |
161 /* dest just needs an lsb */ |
160 /* dest just needs an sb */ |
162 *((FWORD *) dest_pos) = src_lsb; |
161 *((FWORD *) dest_pos) = src_sb; |
163 } |
162 } |
164 } |
163 } |
165 dest_pos += (i < num_advances ? 4 : 2); |
164 dest_pos += (i < num_advances ? 4 : 2); |
166 } |
165 } |
167 _mtx.fini (); |
166 _mtx.fini (); |
185 |
184 |
186 struct accelerator_t |
185 struct accelerator_t |
187 { |
186 { |
188 friend struct hmtxvmtx; |
187 friend struct hmtxvmtx; |
189 |
188 |
190 inline void init (hb_face_t *face, |
189 void init (hb_face_t *face, |
191 unsigned int default_advance_ = 0) |
190 unsigned int default_advance_ = 0) |
192 { |
191 { |
193 default_advance = default_advance_ ? default_advance_ : hb_face_get_upem (face); |
192 default_advance = default_advance_ ? default_advance_ : hb_face_get_upem (face); |
194 |
193 |
195 bool got_font_extents = false; |
194 bool got_font_extents = false; |
196 if (T::os2Tag) |
195 if (T::os2Tag != HB_TAG_NONE && face->table.OS2->is_typo_metrics ()) |
197 { |
196 { |
198 hb_blob_t *os2_blob = Sanitizer<os2> ().sanitize (face->reference_table (T::os2Tag)); |
197 ascender = abs (face->table.OS2->sTypoAscender); |
199 const os2 *os2_table = os2_blob->as<os2> (); |
198 descender = -abs (face->table.OS2->sTypoDescender); |
200 #define USE_TYPO_METRICS (1u<<7) |
199 line_gap = face->table.OS2->sTypoLineGap; |
201 if (0 != (os2_table->fsSelection & USE_TYPO_METRICS)) |
200 got_font_extents = (ascender | descender) != 0; |
202 { |
201 } |
203 ascender = os2_table->sTypoAscender; |
202 |
204 descender = os2_table->sTypoDescender; |
203 hb_blob_t *_hea_blob = hb_sanitize_context_t().reference_table<H> (face); |
205 line_gap = os2_table->sTypoLineGap; |
|
206 got_font_extents = (ascender | descender) != 0; |
|
207 } |
|
208 hb_blob_destroy (os2_blob); |
|
209 } |
|
210 |
|
211 hb_blob_t *_hea_blob = Sanitizer<H> ().sanitize (face->reference_table (H::tableTag)); |
|
212 const H *_hea_table = _hea_blob->as<H> (); |
204 const H *_hea_table = _hea_blob->as<H> (); |
213 num_advances = _hea_table->numberOfLongMetrics; |
205 num_advances = _hea_table->numberOfLongMetrics; |
214 if (!got_font_extents) |
206 if (!got_font_extents) |
215 { |
207 { |
216 ascender = _hea_table->ascender; |
208 ascender = abs (_hea_table->ascender); |
217 descender = _hea_table->descender; |
209 descender = -abs (_hea_table->descender); |
218 line_gap = _hea_table->lineGap; |
210 line_gap = _hea_table->lineGap; |
219 got_font_extents = (ascender | descender) != 0; |
211 got_font_extents = (ascender | descender) != 0; |
220 } |
212 } |
221 hb_blob_destroy (_hea_blob); |
213 hb_blob_destroy (_hea_blob); |
222 |
214 |
223 has_font_extents = got_font_extents; |
215 has_font_extents = got_font_extents; |
224 |
216 |
225 blob = Sanitizer<hmtxvmtx> ().sanitize (face->reference_table (T::tableTag)); |
217 table = hb_sanitize_context_t().reference_table<hmtxvmtx> (face, T::tableTag); |
226 |
218 |
227 /* Cap num_metrics() and num_advances() based on table length. */ |
219 /* Cap num_metrics() and num_advances() based on table length. */ |
228 unsigned int len = hb_blob_get_length (blob); |
220 unsigned int len = table.get_length (); |
229 if (unlikely (num_advances * 4 > len)) |
221 if (unlikely (num_advances * 4 > len)) |
230 num_advances = len / 4; |
222 num_advances = len / 4; |
231 num_metrics = num_advances + (len - 4 * num_advances) / 2; |
223 num_metrics = num_advances + (len - 4 * num_advances) / 2; |
232 |
224 |
233 /* We MUST set num_metrics to zero if num_advances is zero. |
225 /* We MUST set num_metrics to zero if num_advances is zero. |
234 * Our get_advance() depends on that. */ |
226 * Our get_advance() depends on that. */ |
235 if (unlikely (!num_advances)) |
227 if (unlikely (!num_advances)) |
236 { |
228 { |
237 num_metrics = num_advances = 0; |
229 num_metrics = num_advances = 0; |
238 hb_blob_destroy (blob); |
230 table.destroy (); |
239 blob = hb_blob_get_empty (); |
231 table = hb_blob_get_empty (); |
240 } |
232 } |
241 table = blob->as<hmtxvmtx> (); |
233 |
242 |
234 var_table = hb_sanitize_context_t().reference_table<HVARVVAR> (face, T::variationsTag); |
243 var_blob = Sanitizer<HVARVVAR> ().sanitize (face->reference_table (T::variationsTag)); |
235 } |
244 var_table = var_blob->as<HVARVVAR> (); |
236 |
245 } |
237 void fini () |
246 |
238 { |
247 inline void fini (void) |
239 table.destroy (); |
248 { |
240 var_table.destroy (); |
249 hb_blob_destroy (blob); |
241 } |
250 hb_blob_destroy (var_blob); |
242 |
251 } |
243 /* TODO Add variations version. */ |
252 |
244 unsigned int get_side_bearing (hb_codepoint_t glyph) const |
253 inline unsigned int get_advance (hb_codepoint_t glyph) const |
245 { |
|
246 if (glyph < num_advances) |
|
247 return table->longMetricZ[glyph].sb; |
|
248 |
|
249 if (unlikely (glyph >= num_metrics)) |
|
250 return 0; |
|
251 |
|
252 const FWORD *bearings = (const FWORD *) &table->longMetricZ[num_advances]; |
|
253 return bearings[glyph - num_advances]; |
|
254 } |
|
255 |
|
256 unsigned int get_advance (hb_codepoint_t glyph) const |
254 { |
257 { |
255 if (unlikely (glyph >= num_metrics)) |
258 if (unlikely (glyph >= num_metrics)) |
256 { |
259 { |
257 /* If num_metrics is zero, it means we don't have the metrics table |
260 /* If num_metrics is zero, it means we don't have the metrics table |
258 * for this direction: return default advance. Otherwise, it means that the |
261 * for this direction: return default advance. Otherwise, it means that the |
261 return 0; |
264 return 0; |
262 else |
265 else |
263 return default_advance; |
266 return default_advance; |
264 } |
267 } |
265 |
268 |
266 return table->longMetric[MIN (glyph, (uint32_t) num_advances - 1)].advance; |
269 return table->longMetricZ[MIN (glyph, (uint32_t) num_advances - 1)].advance; |
267 } |
270 } |
268 |
271 |
269 inline unsigned int get_advance (hb_codepoint_t glyph, |
272 unsigned int get_advance (hb_codepoint_t glyph, |
270 hb_font_t *font) const |
273 hb_font_t *font) const |
271 { |
274 { |
272 unsigned int advance = get_advance (glyph); |
275 unsigned int advance = get_advance (glyph); |
273 if (likely(glyph < num_metrics)) |
276 if (likely (glyph < num_metrics)) |
274 { |
277 { |
275 advance += (font->num_coords ? var_table->get_advance_var (glyph, font->coords, font->num_coords) : 0); // TODO Optimize?! |
278 advance += (font->num_coords ? var_table->get_advance_var (glyph, font->coords, font->num_coords) : 0); // TODO Optimize?! |
276 } |
279 } |
277 return advance; |
280 return advance; |
278 } |
281 } |
279 |
282 |
280 public: |
283 public: |
281 bool has_font_extents; |
284 bool has_font_extents; |
282 unsigned short ascender; |
285 int ascender; |
283 unsigned short descender; |
286 int descender; |
284 unsigned short line_gap; |
287 int line_gap; |
285 |
288 |
286 protected: |
289 protected: |
287 unsigned int num_metrics; |
290 unsigned int num_metrics; |
288 unsigned int num_advances; |
291 unsigned int num_advances; |
289 unsigned int default_advance; |
292 unsigned int default_advance; |
290 |
293 |
291 private: |
294 private: |
292 const hmtxvmtx *table; |
295 hb_blob_ptr_t<hmtxvmtx> table; |
293 hb_blob_t *blob; |
296 hb_blob_ptr_t<HVARVVAR> var_table; |
294 const HVARVVAR *var_table; |
|
295 hb_blob_t *var_blob; |
|
296 }; |
297 }; |
297 |
298 |
298 protected: |
299 protected: |
299 LongMetric longMetric[VAR]; /* Paired advance width and leading |
300 UnsizedArrayOf<LongMetric>longMetricZ;/* Paired advance width and leading |
300 * bearing values for each glyph. The |
301 * bearing values for each glyph. The |
301 * value numOfHMetrics comes from |
302 * value numOfHMetrics comes from |
302 * the 'hhea' table. If the font is |
303 * the 'hhea' table. If the font is |
303 * monospaced, only one entry need |
304 * monospaced, only one entry need |
304 * be in the array, but that entry is |
305 * be in the array, but that entry is |
305 * required. The last entry applies to |
306 * required. The last entry applies to |
306 * all subsequent glyphs. */ |
307 * all subsequent glyphs. */ |
307 /*FWORD leadingBearingX[VAR];*/ /* Here the advance is assumed |
308 /*UnsizedArrayOf<FWORD> leadingBearingX;*//* Here the advance is assumed |
308 * to be the same as the advance |
309 * to be the same as the advance |
309 * for the last entry above. The |
310 * for the last entry above. The |
310 * number of entries in this array is |
311 * number of entries in this array is |
311 * derived from numGlyphs (from 'maxp' |
312 * derived from numGlyphs (from 'maxp' |
312 * table) minus numberOfLongMetrics. |
313 * table) minus numberOfLongMetrics. |
316 * run is allowed and it must be at |
317 * run is allowed and it must be at |
317 * the end. This allows a monospaced |
318 * the end. This allows a monospaced |
318 * font to vary the side bearing |
319 * font to vary the side bearing |
319 * values for each glyph. */ |
320 * values for each glyph. */ |
320 public: |
321 public: |
321 DEFINE_SIZE_ARRAY (0, longMetric); |
322 DEFINE_SIZE_ARRAY (0, longMetricZ); |
322 }; |
323 }; |
323 |
324 |
324 struct hmtx : hmtxvmtx<hmtx, hhea> { |
325 struct hmtx : hmtxvmtx<hmtx, hhea> { |
325 static const hb_tag_t tableTag = HB_OT_TAG_hmtx; |
326 static constexpr hb_tag_t tableTag = HB_OT_TAG_hmtx; |
326 static const hb_tag_t variationsTag = HB_OT_TAG_HVAR; |
327 static constexpr hb_tag_t variationsTag = HB_OT_TAG_HVAR; |
327 static const hb_tag_t os2Tag = HB_OT_TAG_os2; |
328 static constexpr hb_tag_t os2Tag = HB_OT_TAG_OS2; |
328 }; |
329 }; |
329 struct vmtx : hmtxvmtx<vmtx, vhea> { |
330 struct vmtx : hmtxvmtx<vmtx, vhea> { |
330 static const hb_tag_t tableTag = HB_OT_TAG_vmtx; |
331 static constexpr hb_tag_t tableTag = HB_OT_TAG_vmtx; |
331 static const hb_tag_t variationsTag = HB_OT_TAG_VVAR; |
332 static constexpr hb_tag_t variationsTag = HB_OT_TAG_VVAR; |
332 static const hb_tag_t os2Tag = HB_TAG_NONE; |
333 static constexpr hb_tag_t os2Tag = HB_TAG_NONE; |
333 }; |
334 }; |
334 |
335 |
|
336 struct hmtx_accelerator_t : hmtx::accelerator_t {}; |
|
337 struct vmtx_accelerator_t : vmtx::accelerator_t {}; |
|
338 |
335 } /* namespace OT */ |
339 } /* namespace OT */ |
336 |
340 |
337 |
341 |
338 #endif /* HB_OT_HMTX_TABLE_HH */ |
342 #endif /* HB_OT_HMTX_TABLE_HH */ |