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 #define HB_SHAPER graphite2
30 #define hb_graphite2_shaper_font_data_t gr_font
31 #include "hb-shaper-impl-private.hh"
33 #include "hb-graphite2.h"
35 #include <graphite2/Segment.h>
38 HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, face)
39 HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, font)
46 typedef struct hb_graphite2_tablelist_t {
47 struct hb_graphite2_tablelist_t *next;
50 } hb_graphite2_tablelist_t;
52 struct hb_graphite2_shaper_face_data_t {
55 hb_graphite2_tablelist_t *tlist;
58 static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len)
60 hb_graphite2_shaper_face_data_t *face_data = (hb_graphite2_shaper_face_data_t *) data;
61 hb_graphite2_tablelist_t *tlist = face_data->tlist;
63 hb_blob_t *blob = NULL;
65 for (hb_graphite2_tablelist_t *p = tlist; p; p = p->next)
73 blob = face_data->face->reference_table (tag);
75 hb_graphite2_tablelist_t *p = (hb_graphite2_tablelist_t *) calloc (1, sizeof (hb_graphite2_tablelist_t));
77 hb_blob_destroy (blob);
83 /* TODO Not thread-safe, but fairly harmless.
84 * We can do the double-chcked pointer cmpexch thing here. */
85 p->next = face_data->tlist;
90 const char *d = hb_blob_get_data (blob, &tlen);
95 hb_graphite2_shaper_face_data_t *
96 _hb_graphite2_shaper_face_data_create (hb_face_t *face)
98 hb_blob_t *silf_blob = face->reference_table (HB_GRAPHITE2_TAG_SILF);
99 /* Umm, we just reference the table to check whether it exists.
100 * Maybe add better API for this? */
101 if (!hb_blob_get_length (silf_blob))
103 hb_blob_destroy (silf_blob);
106 hb_blob_destroy (silf_blob);
108 hb_graphite2_shaper_face_data_t *data = (hb_graphite2_shaper_face_data_t *) calloc (1, sizeof (hb_graphite2_shaper_face_data_t));
109 if (unlikely (!data))
113 data->grface = gr_make_face (data, &hb_graphite2_get_table, gr_face_preloadAll);
115 if (unlikely (!data->grface)) {
124 _hb_graphite2_shaper_face_data_destroy (hb_graphite2_shaper_face_data_t *data)
126 hb_graphite2_tablelist_t *tlist = data->tlist;
130 hb_graphite2_tablelist_t *old = tlist;
131 hb_blob_destroy (tlist->blob);
136 gr_face_destroy (data->grface);
142 hb_graphite2_face_get_gr_face (hb_face_t *face)
144 if (unlikely (!hb_graphite2_shaper_face_data_ensure (face))) return NULL;
145 return HB_SHAPER_DATA_GET (face)->grface;
153 static float hb_graphite2_get_advance (const void *hb_font, unsigned short gid)
155 return ((hb_font_t *) hb_font)->get_glyph_h_advance (gid);
158 hb_graphite2_shaper_font_data_t *
159 _hb_graphite2_shaper_font_data_create (hb_font_t *font)
161 if (unlikely (!hb_graphite2_shaper_face_data_ensure (font->face))) return NULL;
163 hb_face_t *face = font->face;
164 hb_graphite2_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
166 return gr_make_font_with_advance_fn (font->x_scale, font, &hb_graphite2_get_advance, face_data->grface);
170 _hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data)
172 gr_font_destroy (data);
176 hb_graphite2_font_get_gr_font (hb_font_t *font)
178 if (unlikely (!hb_graphite2_shaper_font_data_ensure (font))) return NULL;
179 return HB_SHAPER_DATA_GET (font);
184 * shaper shape_plan data
187 struct hb_graphite2_shaper_shape_plan_data_t {};
189 hb_graphite2_shaper_shape_plan_data_t *
190 _hb_graphite2_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
191 const hb_feature_t *user_features HB_UNUSED,
192 unsigned int num_user_features HB_UNUSED)
194 return (hb_graphite2_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
198 _hb_graphite2_shaper_shape_plan_data_destroy (hb_graphite2_shaper_shape_plan_data_t *data HB_UNUSED)
207 struct hb_graphite2_cluster_t {
208 unsigned int base_char;
209 unsigned int num_chars;
210 unsigned int base_glyph;
211 unsigned int num_glyphs;
215 _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
218 const hb_feature_t *features,
219 unsigned int num_features)
221 hb_face_t *face = font->face;
222 gr_face *grface = HB_SHAPER_DATA_GET (face)->grface;
223 gr_font *grfont = HB_SHAPER_DATA_GET (font);
225 const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
226 const char *lang_end = lang ? strchr (lang, '-') : NULL;
227 int lang_len = lang_end ? lang_end - lang : -1;
228 gr_feature_val *feats = gr_face_featureval_for_lang (grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
230 while (num_features--)
232 const gr_feature_ref *fref = gr_face_find_fref (grface, features->tag);
234 gr_fref_set_feature_value (fref, features->value, feats);
238 gr_segment *seg = NULL;
240 unsigned int ci = 0, ic = 0;
241 float curradvx = 0., curradvy = 0.;
243 unsigned int scratch_size;
244 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
246 uint32_t *chars = (uint32_t *) scratch;
248 for (unsigned int i = 0; i < buffer->len; ++i)
249 chars[i] = buffer->info[i].codepoint;
251 hb_tag_t script_tag[2];
252 hb_ot_tags_from_script (hb_buffer_get_script (buffer), &script_tag[0], &script_tag[1]);
254 seg = gr_make_seg (grfont, grface,
255 script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1],
257 gr_utf32, chars, buffer->len,
258 2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0));
260 if (unlikely (!seg)) {
261 if (feats) gr_featureval_destroy (feats);
265 unsigned int glyph_count = gr_seg_n_slots (seg);
266 if (unlikely (!glyph_count)) {
267 if (feats) gr_featureval_destroy (feats);
268 gr_seg_destroy (seg);
272 scratch = buffer->get_scratch_buffer (&scratch_size);
273 while ((DIV_CEIL (sizeof (hb_graphite2_cluster_t) * buffer->len, sizeof (*scratch)) +
274 DIV_CEIL (sizeof (hb_codepoint_t) * glyph_count, sizeof (*scratch))) > scratch_size)
276 buffer->ensure (buffer->allocated * 2);
277 if (unlikely (buffer->in_error)) {
278 if (feats) gr_featureval_destroy (feats);
279 gr_seg_destroy (seg);
282 scratch = buffer->get_scratch_buffer (&scratch_size);
285 #define ALLOCATE_ARRAY(Type, name, len) \
286 Type *name = (Type *) scratch; \
288 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
289 assert (_consumed <= scratch_size); \
290 scratch += _consumed; \
291 scratch_size -= _consumed; \
294 ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len);
295 ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count);
297 #undef ALLOCATE_ARRAY
299 memset (clusters, 0, sizeof (clusters[0]) * buffer->len);
301 hb_codepoint_t *pg = gids;
302 for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++)
304 unsigned int before = gr_slot_before (is);
305 unsigned int after = gr_slot_after (is);
306 *pg = gr_slot_gid (is);
308 while (clusters[ci].base_char > before && ci)
310 clusters[ci-1].num_chars += clusters[ci].num_chars;
311 clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
315 if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
317 hb_graphite2_cluster_t *c = clusters + ci + 1;
318 c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
319 c->num_chars = before - c->base_char;
324 clusters[ci].num_glyphs++;
326 if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
327 clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
331 //buffer->clear_output ();
332 for (unsigned int i = 0; i < ci; ++i)
334 for (unsigned int j = 0; j < clusters[i].num_glyphs; ++j)
336 hb_glyph_info_t *info = &buffer->info[clusters[i].base_glyph + j];
337 info->codepoint = gids[clusters[i].base_glyph + j];
338 info->cluster = gr_cinfo_base(gr_seg_cinfo(seg, clusters[i].base_char));
341 buffer->len = glyph_count;
342 //buffer->swap_buffers ();
344 if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
345 curradvx = gr_seg_advance_X(seg);
347 hb_glyph_position_t *pPos;
348 for (pPos = hb_buffer_get_glyph_positions (buffer, NULL), is = gr_seg_first_slot (seg);
349 is; pPos++, is = gr_slot_next_in_segment (is))
351 pPos->x_offset = gr_slot_origin_X (is) - curradvx;
352 pPos->y_offset = gr_slot_origin_Y (is) - curradvy;
353 pPos->x_advance = gr_slot_advance_X (is, grface, grfont);
354 pPos->y_advance = gr_slot_advance_Y (is, grface, grfont);
355 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
356 curradvx -= pPos->x_advance;
357 pPos->x_offset = gr_slot_origin_X (is) - curradvx;
358 if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
359 curradvx += pPos->x_advance;
360 pPos->y_offset = gr_slot_origin_Y (is) - curradvy;
361 curradvy += pPos->y_advance;
363 if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
364 pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx;
366 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
367 hb_buffer_reverse_clusters (buffer);
369 if (feats) gr_featureval_destroy (feats);
370 gr_seg_destroy (seg);