2 * Copyright © 2011 Martin Hosken
3 * Copyright © 2011 SIL International
4 * Copyright © 2011,2012 Google, Inc.
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 * Google Author(s): Behdad Esfahbod
29 #include "hb-shaper-impl.hh"
31 #include "hb-graphite2.h"
33 #include <graphite2/Segment.h>
35 #include "hb-ot-layout.h"
39 * SECTION:hb-graphite2
40 * @title: hb-graphite2
41 * @short_description: Graphite2 integration
42 * @include: hb-graphite2.h
44 * Functions for using HarfBuzz with the Graphite2 fonts.
52 typedef struct hb_graphite2_tablelist_t
54 struct hb_graphite2_tablelist_t *next;
57 } hb_graphite2_tablelist_t;
59 struct hb_graphite2_face_data_t
63 hb_atomic_ptr_t<hb_graphite2_tablelist_t> tlist;
66 static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len)
68 hb_graphite2_face_data_t *face_data = (hb_graphite2_face_data_t *) data;
69 hb_graphite2_tablelist_t *tlist = face_data->tlist;
71 hb_blob_t *blob = nullptr;
73 for (hb_graphite2_tablelist_t *p = tlist; p; p = p->next)
81 blob = face_data->face->reference_table (tag);
83 hb_graphite2_tablelist_t *p = (hb_graphite2_tablelist_t *) calloc (1, sizeof (hb_graphite2_tablelist_t));
85 hb_blob_destroy (blob);
92 hb_graphite2_tablelist_t *tlist = face_data->tlist;
95 if (unlikely (!face_data->tlist.cmpexch (tlist, p)))
100 const char *d = hb_blob_get_data (blob, &tlen);
105 static void hb_graphite2_release_table(const void *data, const void *table_buffer)
107 hb_graphite2_face_data_t *face_data = (hb_graphite2_face_data_t *) data;
108 hb_graphite2_tablelist_t *tlist = face_data->tlist;
110 hb_graphite2_tablelist_t *prev = nullptr;
111 hb_graphite2_tablelist_t *curr = tlist;
114 if (hb_blob_get_data(curr->blob, nullptr) == table_buffer)
117 face_data->tlist.cmpexch(tlist, curr->next);
119 prev->next = curr->next;
120 hb_blob_destroy(curr->blob);
129 static gr_face_ops hb_graphite2_face_ops = { sizeof(gr_face_ops), hb_graphite2_get_table, hb_graphite2_release_table };
131 hb_graphite2_face_data_t *
132 _hb_graphite2_shaper_face_data_create (hb_face_t *face)
134 hb_blob_t *silf_blob = face->reference_table (HB_GRAPHITE2_TAG_SILF);
135 /* Umm, we just reference the table to check whether it exists.
136 * Maybe add better API for this? */
137 if (!hb_blob_get_length (silf_blob))
139 hb_blob_destroy (silf_blob);
142 hb_blob_destroy (silf_blob);
144 hb_graphite2_face_data_t *data = (hb_graphite2_face_data_t *) calloc (1, sizeof (hb_graphite2_face_data_t));
145 if (unlikely (!data))
149 data->grface = gr_make_face_with_ops (data, &hb_graphite2_face_ops, gr_face_preloadAll);
151 if (unlikely (!data->grface)) {
160 _hb_graphite2_shaper_face_data_destroy (hb_graphite2_face_data_t *data)
162 hb_graphite2_tablelist_t *tlist = data->tlist;
166 hb_graphite2_tablelist_t *old = tlist;
167 hb_blob_destroy (tlist->blob);
172 gr_face_destroy (data->grface);
181 hb_graphite2_face_get_gr_face (hb_face_t *face)
183 const hb_graphite2_face_data_t *data = face->data.graphite2;
184 return data ? data->grface : nullptr;
192 struct hb_graphite2_font_data_t {};
194 hb_graphite2_font_data_t *
195 _hb_graphite2_shaper_font_data_create (hb_font_t *font HB_UNUSED)
197 return (hb_graphite2_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
201 _hb_graphite2_shaper_font_data_destroy (hb_graphite2_font_data_t *data HB_UNUSED)
206 * hb_graphite2_font_get_gr_font:
212 hb_graphite2_font_get_gr_font (hb_font_t *font HB_UNUSED)
222 struct hb_graphite2_cluster_t {
223 unsigned int base_char;
224 unsigned int num_chars;
225 unsigned int base_glyph;
226 unsigned int num_glyphs;
227 unsigned int cluster;
228 unsigned int advance;
232 _hb_graphite2_shape (hb_shape_plan_t *shape_plan HB_UNUSED,
235 const hb_feature_t *features,
236 unsigned int num_features)
238 hb_face_t *face = font->face;
239 gr_face *grface = face->data.graphite2->grface;
241 const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
242 const char *lang_end = lang ? strchr (lang, '-') : nullptr;
243 int lang_len = lang_end ? lang_end - lang : -1;
244 gr_feature_val *feats = gr_face_featureval_for_lang (grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
246 for (unsigned int i = 0; i < num_features; i++)
248 const gr_feature_ref *fref = gr_face_find_fref (grface, features[i].tag);
250 gr_fref_set_feature_value (fref, features[i].value, feats);
253 gr_segment *seg = nullptr;
255 unsigned int ci = 0, ic = 0;
256 unsigned int curradvx = 0, curradvy = 0;
258 unsigned int scratch_size;
259 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
261 uint32_t *chars = (uint32_t *) scratch;
263 for (unsigned int i = 0; i < buffer->len; ++i)
264 chars[i] = buffer->info[i].codepoint;
266 /* TODO ensure_native_direction. */
268 hb_tag_t script_tag[HB_OT_MAX_TAGS_PER_SCRIPT];
269 unsigned int count = HB_OT_MAX_TAGS_PER_SCRIPT;
270 hb_ot_tags_from_script_and_language (hb_buffer_get_script (buffer),
276 seg = gr_make_seg (nullptr, grface,
277 count ? script_tag[count - 1] : HB_OT_TAG_DEFAULT_SCRIPT,
279 gr_utf32, chars, buffer->len,
280 2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0));
282 if (unlikely (!seg)) {
283 if (feats) gr_featureval_destroy (feats);
287 unsigned int glyph_count = gr_seg_n_slots (seg);
288 if (unlikely (!glyph_count)) {
289 if (feats) gr_featureval_destroy (feats);
290 gr_seg_destroy (seg);
295 buffer->ensure (glyph_count);
296 scratch = buffer->get_scratch_buffer (&scratch_size);
297 while ((DIV_CEIL (sizeof (hb_graphite2_cluster_t) * buffer->len, sizeof (*scratch)) +
298 DIV_CEIL (sizeof (hb_codepoint_t) * glyph_count, sizeof (*scratch))) > scratch_size)
300 if (unlikely (!buffer->ensure (buffer->allocated * 2)))
302 if (feats) gr_featureval_destroy (feats);
303 gr_seg_destroy (seg);
306 scratch = buffer->get_scratch_buffer (&scratch_size);
309 #define ALLOCATE_ARRAY(Type, name, len) \
310 Type *name = (Type *) scratch; \
312 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
313 assert (_consumed <= scratch_size); \
314 scratch += _consumed; \
315 scratch_size -= _consumed; \
318 ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len);
319 ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count);
321 #undef ALLOCATE_ARRAY
323 memset (clusters, 0, sizeof (clusters[0]) * buffer->len);
325 hb_codepoint_t *pg = gids;
326 clusters[0].cluster = buffer->info[0].cluster;
327 unsigned int upem = hb_face_get_upem (face);
328 float xscale = (float) font->x_scale / upem;
329 float yscale = (float) font->y_scale / upem;
330 yscale *= yscale / xscale;
331 unsigned int curradv = 0;
332 if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
334 curradv = gr_slot_origin_X(gr_seg_first_slot(seg)) * xscale;
335 clusters[0].advance = gr_seg_advance_X(seg) * xscale - curradv;
338 clusters[0].advance = 0;
339 for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++)
341 unsigned int before = gr_slot_before (is);
342 unsigned int after = gr_slot_after (is);
343 *pg = gr_slot_gid (is);
345 while (clusters[ci].base_char > before && ci)
347 clusters[ci-1].num_chars += clusters[ci].num_chars;
348 clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
349 clusters[ci-1].advance += clusters[ci].advance;
353 if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
355 hb_graphite2_cluster_t *c = clusters + ci + 1;
356 c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
357 c->cluster = buffer->info[c->base_char].cluster;
358 c->num_chars = before - c->base_char;
361 if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
363 c->advance = curradv - gr_slot_origin_X(is) * xscale;
364 curradv -= c->advance;
369 clusters[ci].advance += gr_slot_origin_X(is) * xscale - curradv;
370 curradv += clusters[ci].advance;
374 clusters[ci].num_glyphs++;
376 if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
377 clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
380 if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
381 clusters[ci].advance += curradv;
383 clusters[ci].advance += gr_seg_advance_X(seg) * xscale - curradv;
386 for (unsigned int i = 0; i < ci; ++i)
388 for (unsigned int j = 0; j < clusters[i].num_glyphs; ++j)
390 hb_glyph_info_t *info = &buffer->info[clusters[i].base_glyph + j];
391 info->codepoint = gids[clusters[i].base_glyph + j];
392 info->cluster = clusters[i].cluster;
393 info->var1.i32 = clusters[i].advance; // all glyphs in the cluster get the same advance
396 buffer->len = glyph_count;
399 unsigned int currclus = (unsigned int) -1;
400 const hb_glyph_info_t *info = buffer->info;
401 hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, nullptr);
402 if (!HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
405 for (is = gr_seg_first_slot (seg); is; pPos++, ++info, is = gr_slot_next_in_segment (is))
407 pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx;
408 pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
409 if (info->cluster != currclus) {
410 pPos->x_advance = info->var1.i32;
411 curradvx += pPos->x_advance;
412 currclus = info->cluster;
414 pPos->x_advance = 0.;
416 pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
417 curradvy += pPos->y_advance;
422 curradvx = gr_seg_advance_X(seg) * xscale;
423 for (is = gr_seg_first_slot (seg); is; pPos++, info++, is = gr_slot_next_in_segment (is))
425 if (info->cluster != currclus)
427 pPos->x_advance = info->var1.i32;
428 curradvx -= pPos->x_advance;
429 currclus = info->cluster;
431 pPos->x_advance = 0.;
433 pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
434 curradvy -= pPos->y_advance;
435 pPos->x_offset = gr_slot_origin_X (is) * xscale - info->var1.i32 - curradvx + pPos->x_advance;
436 pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
438 hb_buffer_reverse_clusters (buffer);
441 if (feats) gr_featureval_destroy (feats);
442 gr_seg_destroy (seg);
444 buffer->unsafe_to_break_all ();