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 <graphite2/Font.h>
34 #include <graphite2/Segment.h>
36 #include "hb-graphite2.h"
38 #include "hb-ot-tag.h"
41 HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, face)
42 HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, font)
49 typedef struct hb_graphite2_tablelist_t {
50 struct hb_graphite2_tablelist_t *next;
53 } hb_graphite2_tablelist_t;
55 struct hb_graphite2_shaper_face_data_t {
58 hb_graphite2_tablelist_t *tlist;
61 static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len)
63 hb_graphite2_shaper_face_data_t *face_data = (hb_graphite2_shaper_face_data_t *) data;
64 hb_graphite2_tablelist_t *tlist = face_data->tlist;
66 hb_blob_t *blob = NULL;
68 for (hb_graphite2_tablelist_t *p = tlist; p; p = p->next)
76 blob = face_data->face->reference_table (tag);
78 hb_graphite2_tablelist_t *p = (hb_graphite2_tablelist_t *) calloc (1, sizeof (hb_graphite2_tablelist_t));
80 hb_blob_destroy (blob);
86 /* TODO Not thread-safe, but fairly harmless.
87 * We can do the double-chcked pointer cmpexch thing here. */
88 p->next = face_data->tlist;
93 const char *d = hb_blob_get_data (blob, &tlen);
98 hb_graphite2_shaper_face_data_t *
99 _hb_graphite2_shaper_face_data_create (hb_face_t *face)
101 hb_blob_t *silf_blob = face->reference_table (HB_GRAPHITE2_TAG_SILF);
102 /* Umm, we just reference the table to check whether it exists.
103 * Maybe add better API for this? */
104 if (!hb_blob_get_length (silf_blob))
106 hb_blob_destroy (silf_blob);
109 hb_blob_destroy (silf_blob);
111 hb_graphite2_shaper_face_data_t *data = (hb_graphite2_shaper_face_data_t *) calloc (1, sizeof (hb_graphite2_shaper_face_data_t));
112 if (unlikely (!data))
113 hb_blob_destroy (silf_blob);
116 data->grface = gr_make_face (data, &hb_graphite2_get_table, gr_face_default);
118 if (unlikely (!data->grface)) {
127 _hb_graphite2_shaper_face_data_destroy (hb_graphite2_shaper_face_data_t *data)
129 hb_graphite2_tablelist_t *tlist = data->tlist;
133 hb_graphite2_tablelist_t *old = tlist;
134 hb_blob_destroy (tlist->blob);
139 gr_face_destroy (data->grface);
149 static float hb_graphite2_get_advance (const void *hb_font, unsigned short gid)
151 return ((hb_font_t *) hb_font)->get_glyph_h_advance (gid);
154 hb_graphite2_shaper_font_data_t *
155 _hb_graphite2_shaper_font_data_create (hb_font_t *font)
157 if (unlikely (!hb_graphite2_shaper_face_data_ensure (font->face))) return NULL;
159 hb_face_t *face = font->face;
160 hb_graphite2_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
162 return gr_make_font_with_advance_fn (font->x_scale, font, &hb_graphite2_get_advance, face_data->grface);
166 _hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data)
168 gr_font_destroy (data);
173 * shaper shape_plan data
176 struct hb_graphite2_shaper_shape_plan_data_t {};
178 hb_graphite2_shaper_shape_plan_data_t *
179 _hb_graphite2_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
180 const hb_feature_t *user_features HB_UNUSED,
181 unsigned int num_user_features HB_UNUSED)
183 return (hb_graphite2_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
187 _hb_graphite2_shaper_shape_plan_data_destroy (hb_graphite2_shaper_shape_plan_data_t *data HB_UNUSED)
196 struct hb_graphite2_cluster_t {
197 unsigned int base_char;
198 unsigned int num_chars;
199 unsigned int base_glyph;
200 unsigned int num_glyphs;
204 _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
207 const hb_feature_t *features,
208 unsigned int num_features)
210 hb_face_t *face = font->face;
211 gr_face *grface = HB_SHAPER_DATA_GET (face)->grface;
212 gr_font *grfont = HB_SHAPER_DATA_GET (font);
214 unsigned int charlen;
215 hb_glyph_info_t *bufferi = hb_buffer_get_glyph_infos (buffer, &charlen);
219 const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
220 const char *lang_end = strchr (lang, '-');
221 int lang_len = lang_end ? lang_end - lang : -1;
222 gr_feature_val *feats = gr_face_featureval_for_lang (grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
224 while (num_features--)
226 const gr_feature_ref *fref = gr_face_find_fref (grface, features->tag);
228 gr_fref_set_feature_value (fref, features->value, feats);
232 /* TODO Use scratch buffer for these. */
233 hb_codepoint_t *gids = NULL, *pg;
234 hb_graphite2_cluster_t *clusters = NULL;
235 gr_segment *seg = NULL;
236 uint32_t *text = NULL;
238 unsigned int ci = 0, ic = 0;
239 float curradvx = 0., curradvy = 0.;
240 unsigned int glyphlen = 0;
243 text = (uint32_t *) malloc ((charlen + 1) * sizeof (uint32_t));
244 if (!text) goto dieout;
247 for (unsigned int i = 0; i < charlen; ++i)
248 *p++ = bufferi++->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, text, charlen,
258 2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0));
259 if (!seg) goto dieout;
261 glyphlen = gr_seg_n_slots (seg);
262 clusters = (hb_graphite2_cluster_t *) calloc (charlen, sizeof (hb_graphite2_cluster_t));
263 if (!glyphlen || !clusters) goto dieout;
265 gids = (hb_codepoint_t *) malloc (glyphlen * sizeof (hb_codepoint_t));
266 if (!gids) goto dieout;
269 for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++)
271 unsigned int before = gr_slot_before (is);
272 unsigned int after = gr_slot_after (is);
273 *pg = gr_slot_gid (is);
275 while (clusters[ci].base_char > before && ci)
277 clusters[ci-1].num_chars += clusters[ci].num_chars;
278 clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
282 if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
284 hb_graphite2_cluster_t *c = clusters + ci + 1;
285 c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
286 c->num_chars = before - c->base_char;
291 clusters[ci].num_glyphs++;
293 if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
294 clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
298 buffer->clear_output ();
299 for (unsigned int i = 0; i < ci; ++i)
300 buffer->replace_glyphs (clusters[i].num_chars, clusters[i].num_glyphs, gids + clusters[i].base_glyph);
301 buffer->swap_buffers ();
303 if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
304 curradvx = gr_seg_advance_X(seg);
306 hb_glyph_position_t *pPos;
307 for (pPos = hb_buffer_get_glyph_positions (buffer, NULL), is = gr_seg_first_slot (seg);
308 is; pPos++, is = gr_slot_next_in_segment (is))
310 pPos->x_offset = gr_slot_origin_X (is) - curradvx;
311 pPos->y_offset = gr_slot_origin_Y (is) - curradvy;
312 pPos->x_advance = gr_slot_advance_X (is, grface, grfont);
313 pPos->y_advance = gr_slot_advance_Y (is, grface, grfont);
314 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
315 curradvx -= pPos->x_advance;
316 pPos->x_offset = gr_slot_origin_X (is) - curradvx;
317 if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
318 curradvx += pPos->x_advance;
319 pPos->y_offset = gr_slot_origin_Y (is) - curradvy;
320 curradvy += pPos->y_advance;
322 if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
323 pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx;
325 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
326 hb_buffer_reverse_clusters (buffer);
331 if (feats) gr_featureval_destroy (feats);
332 if (gids) free (gids);
333 if (clusters) free (clusters);
334 if (seg) gr_seg_destroy (seg);
335 if (text) free (text);