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+/*
+ * 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
+ */
+
+#include "hb.hh"
+
+#ifdef HAVE_GRAPHITE2
+
+#include "hb-shaper-impl.hh"
+
+#include "hb-graphite2.h"
+
+#include <graphite2/Segment.h>
+
+#include "hb-ot-layout.h"
+
+
+/**
+ * SECTION:hb-graphite2
+ * @title: hb-graphite2
+ * @short_description: Graphite2 integration
+ * @include: hb-graphite2.h
+ *
+ * Functions for using HarfBuzz with fonts that include Graphite features.
+ *
+ * For Graphite features to work, you must be sure that HarfBuzz was compiled
+ * with the `graphite2` shaping engine enabled. Currently, the default is to
+ * not enable `graphite2` shaping.
+ **/
+
+
+/*
+ * 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_face_data_t
+{
+ hb_face_t *face;
+ gr_face *grface;
+ hb_atomic_ptr_t<hb_graphite2_tablelist_t> tlist;
+};
+
+static const void *hb_graphite2_get_table (const void *data, unsigned int tag, size_t *len)
+{
+ hb_graphite2_face_data_t *face_data = (hb_graphite2_face_data_t *) data;
+ hb_graphite2_tablelist_t *tlist = face_data->tlist;
+
+ hb_blob_t *blob = nullptr;
+
+ 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 *) hb_calloc (1, sizeof (hb_graphite2_tablelist_t));
+ if (unlikely (!p)) {
+ hb_blob_destroy (blob);
+ return nullptr;
+ }
+ p->blob = blob;
+ p->tag = tag;
+
+retry:
+ hb_graphite2_tablelist_t *tlist = face_data->tlist;
+ p->next = tlist;
+
+ if (unlikely (!face_data->tlist.cmpexch (tlist, p)))
+ goto retry;
+ }
+
+ unsigned int tlen;
+ const char *d = hb_blob_get_data (blob, &tlen);
+ *len = tlen;
+ return d;
+}
+
+hb_graphite2_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 nullptr;
+ }
+ hb_blob_destroy (silf_blob);
+
+ hb_graphite2_face_data_t *data = (hb_graphite2_face_data_t *) hb_calloc (1, sizeof (hb_graphite2_face_data_t));
+ if (unlikely (!data))
+ return nullptr;
+
+ data->face = face;
+ const gr_face_ops ops = {sizeof(gr_face_ops), &hb_graphite2_get_table, NULL};
+ data->grface = gr_make_face_with_ops (data, &ops, gr_face_preloadAll);
+
+ if (unlikely (!data->grface)) {
+ hb_free (data);
+ return nullptr;
+ }
+
+ return data;
+}
+
+void
+_hb_graphite2_shaper_face_data_destroy (hb_graphite2_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;
+ hb_free (old);
+ }
+
+ gr_face_destroy (data->grface);
+
+ hb_free (data);
+}
+
+/**
+ * hb_graphite2_face_get_gr_face: (skip)
+ * @face: @hb_face_t to query
+ *
+ * Fetches the Graphite2 gr_face corresponding to the specified
+ * #hb_face_t face object.
+ *
+ * Return value: the gr_face found
+ *
+ * Since: 0.9.10
+ */
+gr_face *
+hb_graphite2_face_get_gr_face (hb_face_t *face)
+{
+ const hb_graphite2_face_data_t *data = face->data.graphite2;
+ return data ? data->grface : nullptr;
+}
+
+
+/*
+ * shaper font data
+ */
+
+struct hb_graphite2_font_data_t {};
+
+hb_graphite2_font_data_t *
+_hb_graphite2_shaper_font_data_create (hb_font_t *font HB_UNUSED)
+{
+ return (hb_graphite2_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
+}
+
+void
+_hb_graphite2_shaper_font_data_destroy (hb_graphite2_font_data_t *data HB_UNUSED)
+{
+}
+
+#ifndef HB_DISABLE_DEPRECATED
+/**
+ * hb_graphite2_font_get_gr_font: (skip)
+ * @font: An #hb_font_t
+ *
+ * Always returns `NULL`. Use hb_graphite2_face_get_gr_face() instead.
+ *
+ * Return value: (nullable): Graphite2 font associated with @font.
+ *
+ * Since: 0.9.10
+ * Deprecated: 1.4.2
+ */
+gr_font *
+hb_graphite2_font_get_gr_font (hb_font_t *font HB_UNUSED)
+{
+ return nullptr;
+}
+#endif
+
+
+/*
+ * shaper
+ */
+
+struct hb_graphite2_cluster_t {
+ unsigned int base_char;
+ unsigned int num_chars;
+ unsigned int base_glyph;
+ unsigned int num_glyphs;
+ unsigned int cluster;
+ int advance;
+};
+
+hb_bool_t
+_hb_graphite2_shape (hb_shape_plan_t *shape_plan HB_UNUSED,
+ 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 = face->data.graphite2->grface;
+
+ const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
+ const char *lang_end = lang ? strchr (lang, '-') : nullptr;
+ 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);
+
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ const gr_feature_ref *fref = gr_face_find_fref (grface, features[i].tag);
+ if (fref)
+ gr_fref_set_feature_value (fref, features[i].value, feats);
+ }
+
+ hb_direction_t direction = buffer->props.direction;
+ hb_direction_t horiz_dir = hb_script_get_horizontal_direction (buffer->props.script);
+ /* TODO vertical:
+ * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
+ * Ogham fonts are supposed to be implemented BTT or not. Need to research that
+ * first. */
+ if ((HB_DIRECTION_IS_HORIZONTAL (direction) &&
+ direction != horiz_dir && horiz_dir != HB_DIRECTION_INVALID) ||
+ (HB_DIRECTION_IS_VERTICAL (direction) &&
+ direction != HB_DIRECTION_TTB))
+ {
+ hb_buffer_reverse_clusters (buffer);
+ direction = HB_DIRECTION_REVERSE (direction);
+ }
+
+ gr_segment *seg = nullptr;
+ const gr_slot *is;
+ unsigned int ci = 0, ic = 0;
+ unsigned int curradvx = 0, curradvy = 0;
+
+ unsigned int scratch_size;
+ hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
+
+ uint32_t *chars = (uint32_t *) scratch;
+
+ for (unsigned int i = 0; i < buffer->len; ++i)
+ chars[i] = buffer->info[i].codepoint;
+
+ seg = gr_make_seg (nullptr, grface,
+ HB_TAG_NONE, // https://github.com/harfbuzz/harfbuzz/issues/3439#issuecomment-1442650148
+ feats,
+ gr_utf32, chars, buffer->len,
+ 2 | (direction == HB_DIRECTION_RTL ? 1 : 0));
+
+ if (unlikely (!seg)) {
+ if (feats) gr_featureval_destroy (feats);
+ return false;
+ }
+
+ unsigned int glyph_count = gr_seg_n_slots (seg);
+ if (unlikely (!glyph_count)) {
+ if (feats) gr_featureval_destroy (feats);
+ gr_seg_destroy (seg);
+ buffer->len = 0;
+ return true;
+ }
+
+ (void) buffer->ensure (glyph_count);
+ scratch = buffer->get_scratch_buffer (&scratch_size);
+ while ((DIV_CEIL (sizeof (hb_graphite2_cluster_t) * buffer->len, sizeof (*scratch)) +
+ DIV_CEIL (sizeof (hb_codepoint_t) * glyph_count, sizeof (*scratch))) > scratch_size)
+ {
+ if (unlikely (!buffer->ensure (buffer->allocated * 2)))
+ {
+ if (feats) gr_featureval_destroy (feats);
+ gr_seg_destroy (seg);
+ return false;
+ }
+ scratch = buffer->get_scratch_buffer (&scratch_size);
+ }
+
+#define ALLOCATE_ARRAY(Type, name, len) \
+ Type *name = (Type *) scratch; \
+ do { \
+ unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
+ assert (_consumed <= scratch_size); \
+ scratch += _consumed; \
+ scratch_size -= _consumed; \
+ } while (0)
+
+ ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len);
+ ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count);
+
+#undef ALLOCATE_ARRAY
+
+ hb_memset (clusters, 0, sizeof (clusters[0]) * buffer->len);
+
+ hb_codepoint_t *pg = gids;
+ clusters[0].cluster = buffer->info[0].cluster;
+ unsigned int upem = hb_face_get_upem (face);
+ float xscale = (float) font->x_scale / upem;
+ float yscale = (float) font->y_scale / upem;
+ yscale *= yscale / xscale;
+ unsigned int curradv = 0;
+ if (HB_DIRECTION_IS_BACKWARD (direction))
+ {
+ curradv = gr_slot_origin_X(gr_seg_first_slot(seg)) * xscale;
+ clusters[0].advance = gr_seg_advance_X(seg) * xscale - curradv;
+ }
+ else
+ clusters[0].advance = 0;
+ 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;
+ clusters[ci-1].advance += clusters[ci].advance;
+ 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->cluster = buffer->info[c->base_char].cluster;
+ c->num_chars = before - c->base_char;
+ c->base_glyph = ic;
+ c->num_glyphs = 0;
+ if (HB_DIRECTION_IS_BACKWARD (direction))
+ {
+ c->advance = curradv - gr_slot_origin_X(is) * xscale;
+ curradv -= c->advance;
+ }
+ else
+ {
+ auto origin_X = gr_slot_origin_X (is) * xscale;
+ c->advance = 0;
+ clusters[ci].advance += origin_X - curradv;
+ curradv = origin_X;
+ }
+ 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;
+ }
+
+ if (HB_DIRECTION_IS_BACKWARD (direction))
+ clusters[ci].advance += curradv;
+ else
+ clusters[ci].advance += gr_seg_advance_X(seg) * xscale - curradv;
+ ci++;
+
+ for (unsigned int i = 0; i < ci; ++i)
+ {
+ for (unsigned int j = 0; j < clusters[i].num_glyphs; ++j)
+ {
+ hb_glyph_info_t *info = &buffer->info[clusters[i].base_glyph + j];
+ info->codepoint = gids[clusters[i].base_glyph + j];
+ info->cluster = clusters[i].cluster;
+ info->var1.i32 = clusters[i].advance; // all glyphs in the cluster get the same advance
+ }
+ }
+ buffer->len = glyph_count;
+
+ /* Positioning. */
+ unsigned int currclus = UINT_MAX;
+ const hb_glyph_info_t *info = buffer->info;
+ hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, nullptr);
+ if (!HB_DIRECTION_IS_BACKWARD (direction))
+ {
+ curradvx = 0;
+ for (is = gr_seg_first_slot (seg); is; pPos++, ++info, is = gr_slot_next_in_segment (is))
+ {
+ pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx;
+ pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
+ if (info->cluster != currclus) {
+ pPos->x_advance = info->var1.i32;
+ curradvx += pPos->x_advance;
+ currclus = info->cluster;
+ } else
+ pPos->x_advance = 0.;
+
+ pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
+ curradvy += pPos->y_advance;
+ }
+ }
+ else
+ {
+ curradvx = gr_seg_advance_X(seg) * xscale;
+ for (is = gr_seg_first_slot (seg); is; pPos++, info++, is = gr_slot_next_in_segment (is))
+ {
+ if (info->cluster != currclus)
+ {
+ pPos->x_advance = info->var1.i32;
+ curradvx -= pPos->x_advance;
+ currclus = info->cluster;
+ } else
+ pPos->x_advance = 0.;
+
+ pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
+ curradvy -= pPos->y_advance;
+ pPos->x_offset = gr_slot_origin_X (is) * xscale - info->var1.i32 - curradvx + pPos->x_advance;
+ pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
+ }
+ hb_buffer_reverse_clusters (buffer);
+ }
+
+ if (feats) gr_featureval_destroy (feats);
+ gr_seg_destroy (seg);
+
+ buffer->clear_glyph_flags ();
+ buffer->unsafe_to_break ();
+
+ return true;
+}
+
+
+#endif
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