/* * Copyright © 2011 Martin Hosken * Copyright © 2011 SIL International * Copyright © 2011,2012 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Google Author(s): Behdad Esfahbod */ #define HB_SHAPER graphite2 #define hb_graphite2_shaper_font_data_t gr_font #include "hb-shaper-impl-private.hh" #include #include #include "hb-graphite2.h" #include "hb-ot-tag.h" HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, face) HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, font) /* * shaper face data */ typedef struct hb_graphite2_tablelist_t { struct hb_graphite2_tablelist_t *next; hb_blob_t *blob; unsigned int tag; } hb_graphite2_tablelist_t; struct hb_graphite2_shaper_face_data_t { hb_face_t *face; gr_face *grface; hb_graphite2_tablelist_t *tlist; }; static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len) { hb_graphite2_shaper_face_data_t *face_data = (hb_graphite2_shaper_face_data_t *) data; hb_graphite2_tablelist_t *tlist = face_data->tlist; hb_blob_t *blob = NULL; for (hb_graphite2_tablelist_t *p = tlist; p; p = p->next) if (p->tag == tag) { blob = p->blob; break; } if (unlikely (!blob)) { blob = face_data->face->reference_table (tag); hb_graphite2_tablelist_t *p = (hb_graphite2_tablelist_t *) calloc (1, sizeof (hb_graphite2_tablelist_t)); if (unlikely (!p)) { hb_blob_destroy (blob); return NULL; } p->blob = blob; p->tag = tag; /* TODO Not thread-safe, but fairly harmless. * We can do the double-chcked pointer cmpexch thing here. */ p->next = face_data->tlist; face_data->tlist = p; } unsigned int tlen; const char *d = hb_blob_get_data (blob, &tlen); *len = tlen; return d; } hb_graphite2_shaper_face_data_t * _hb_graphite2_shaper_face_data_create (hb_face_t *face) { hb_blob_t *silf_blob = face->reference_table (HB_GRAPHITE2_TAG_SILF); /* Umm, we just reference the table to check whether it exists. * Maybe add better API for this? */ if (!hb_blob_get_length (silf_blob)) { hb_blob_destroy (silf_blob); return NULL; } hb_blob_destroy (silf_blob); hb_graphite2_shaper_face_data_t *data = (hb_graphite2_shaper_face_data_t *) calloc (1, sizeof (hb_graphite2_shaper_face_data_t)); if (unlikely (!data)) hb_blob_destroy (silf_blob); data->face = face; data->grface = gr_make_face (data, &hb_graphite2_get_table, gr_face_default); if (unlikely (!data->grface)) { free (data); return NULL; } return data; } void _hb_graphite2_shaper_face_data_destroy (hb_graphite2_shaper_face_data_t *data) { hb_graphite2_tablelist_t *tlist = data->tlist; while (tlist) { hb_graphite2_tablelist_t *old = tlist; hb_blob_destroy (tlist->blob); tlist = tlist->next; free (old); } gr_face_destroy (data->grface); free (data); } /* * shaper font data */ static float hb_graphite2_get_advance (const void *hb_font, unsigned short gid) { return ((hb_font_t *) hb_font)->get_glyph_h_advance (gid); } hb_graphite2_shaper_font_data_t * _hb_graphite2_shaper_font_data_create (hb_font_t *font) { if (unlikely (!hb_graphite2_shaper_face_data_ensure (font->face))) return NULL; hb_face_t *face = font->face; hb_graphite2_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); return gr_make_font_with_advance_fn (font->x_scale, font, &hb_graphite2_get_advance, face_data->grface); } void _hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data) { gr_font_destroy (data); } /* * shaper shape_plan data */ struct hb_graphite2_shaper_shape_plan_data_t {}; hb_graphite2_shaper_shape_plan_data_t * _hb_graphite2_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan, const hb_feature_t *user_features, unsigned int num_user_features) { return (hb_graphite2_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; } void _hb_graphite2_shaper_shape_plan_data_destroy (hb_graphite2_shaper_shape_plan_data_t *data) { } /* * shaper */ struct hb_graphite2_cluster_t { unsigned int base_char; unsigned int num_chars; unsigned int base_glyph; unsigned int num_glyphs; }; hb_bool_t _hb_graphite2_shape (hb_shape_plan_t *shape_plan, hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features) { hb_face_t *face = font->face; gr_face *grface = HB_SHAPER_DATA_GET (face)->grface; gr_font *grfont = HB_SHAPER_DATA_GET (font); unsigned int charlen; hb_glyph_info_t *bufferi = hb_buffer_get_glyph_infos (buffer, &charlen); int success = 0; const char *lang = hb_language_to_string (hb_buffer_get_language (buffer)); const char *lang_end = strchr (lang, '-'); int lang_len = lang_end ? lang_end - lang : -1; gr_feature_val *feats = gr_face_featureval_for_lang (grface, lang ? hb_tag_from_string (lang, lang_len) : 0); while (num_features--) { const gr_feature_ref *fref = gr_face_find_fref (grface, features->tag); if (fref) gr_fref_set_feature_value (fref, features->value, feats); features++; } /* TODO Use scratch buffer for these. */ hb_codepoint_t *gids = NULL, *pg; hb_graphite2_cluster_t *clusters = NULL; gr_segment *seg = NULL; uint32_t *text = NULL; const gr_slot *is; unsigned int ci = 0, ic = 0; float curradvx = 0., curradvy = 0.; unsigned int glyphlen = 0; unsigned int *p; text = (uint32_t *) malloc ((charlen + 1) * sizeof (uint32_t)); if (!text) goto dieout; p = text; for (unsigned int i = 0; i < charlen; ++i) *p++ = bufferi++->codepoint; *p = 0; hb_tag_t script_tag[2]; hb_ot_tags_from_script (hb_buffer_get_script (buffer), &script_tag[0], &script_tag[1]); seg = gr_make_seg (grfont, grface, script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1], feats, gr_utf32, text, charlen, 2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0)); if (!seg) goto dieout; glyphlen = gr_seg_n_slots (seg); clusters = (hb_graphite2_cluster_t *) calloc (charlen, sizeof (hb_graphite2_cluster_t)); if (!glyphlen || !clusters) goto dieout; gids = (hb_codepoint_t *) malloc (glyphlen * sizeof (hb_codepoint_t)); if (!gids) goto dieout; pg = gids; for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++) { unsigned int before = gr_slot_before (is); unsigned int after = gr_slot_after (is); *pg = gr_slot_gid (is); pg++; while (clusters[ci].base_char > before && ci) { clusters[ci-1].num_chars += clusters[ci].num_chars; clusters[ci-1].num_glyphs += clusters[ci].num_glyphs; ci--; } if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars) { hb_graphite2_cluster_t *c = clusters + ci + 1; c->base_char = clusters[ci].base_char + clusters[ci].num_chars; c->num_chars = before - c->base_char; c->base_glyph = ic; c->num_glyphs = 0; ci++; } clusters[ci].num_glyphs++; if (clusters[ci].base_char + clusters[ci].num_chars < after + 1) clusters[ci].num_chars = after + 1 - clusters[ci].base_char; } ci++; buffer->clear_output (); for (unsigned int i = 0; i < ci; ++i) buffer->replace_glyphs (clusters[i].num_chars, clusters[i].num_glyphs, gids + clusters[i].base_glyph); buffer->swap_buffers (); if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction)) curradvx = gr_seg_advance_X(seg); hb_glyph_position_t *pPos; for (pPos = hb_buffer_get_glyph_positions (buffer, NULL), is = gr_seg_first_slot (seg); is; pPos++, is = gr_slot_next_in_segment (is)) { pPos->x_offset = gr_slot_origin_X (is) - curradvx; pPos->y_offset = gr_slot_origin_Y (is) - curradvy; pPos->x_advance = gr_slot_advance_X (is, grface, grfont); pPos->y_advance = gr_slot_advance_Y (is, grface, grfont); if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) curradvx -= pPos->x_advance; pPos->x_offset = gr_slot_origin_X (is) - curradvx; if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) curradvx += pPos->x_advance; pPos->y_offset = gr_slot_origin_Y (is) - curradvy; curradvy += pPos->y_advance; } if (!HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx; if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) hb_buffer_reverse_clusters (buffer); success = 1; dieout: if (feats) gr_featureval_destroy (feats); if (gids) free (gids); if (clusters) free (clusters); if (seg) gr_seg_destroy (seg); if (text) free (text); return success; }