Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-graphite2.cc

+/*
+ * Copyright © 2011  Martin Hosken
+ * Copyright © 2011  SIL International
+ * Copyright © 2011  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-private.hh"
+
+#include "hb-graphite2.h"
+
+#include "hb-buffer-private.hh"
+#include "hb-font-private.hh"
+#include "hb-ot-tag.h"
+
+#include <graphite2/Font.h>
+#include <graphite2/Segment.h>
+
+
+struct hb_gr_cluster_t {
+  unsigned int base_char;
+  unsigned int num_chars;
+  unsigned int base_glyph;
+  unsigned int num_glyphs;
+};
+
+
+typedef struct hb_gr_tablelist_t {
+  hb_blob_t   *blob;
+  struct hb_gr_tablelist_t *next;
+  unsigned int tag;
+} hb_gr_tablelist_t;
+
+static struct hb_gr_face_data_t {
+  hb_face_t         *face;
+  gr_face           *grface;
+  hb_gr_tablelist_t *tlist;
+} _hb_gr_face_data_nil = {NULL, NULL};
+
+static struct hb_gr_font_data_t {
+  gr_font   *grfont;
+  gr_face   *grface;
+} _hb_gr_font_data_nil = {NULL, NULL};
+
+
+static const void *hb_gr_get_table (const void *data, unsigned int tag, size_t *len)
+{
+  hb_gr_tablelist_t *pl = NULL, *p;
+  hb_gr_face_data_t *face = (hb_gr_face_data_t *) data;
+  hb_gr_tablelist_t *tlist = face->tlist;
+
+  for (p = tlist; p; p = p->next)
+    if (p->tag == tag ) {
+      unsigned int tlen;
+      const char *d = hb_blob_get_data (p->blob, &tlen);
+      *len = tlen;
+      return d;
+    } else
+      pl = p;
+
+  if (!face->face)
+    return NULL;
+  hb_blob_t *blob = hb_face_reference_table (face->face, tag);
+
+  if (!pl || pl->blob)
+  {
+    p = (hb_gr_tablelist_t *) malloc (sizeof (hb_gr_tablelist_t));
+    if (!p) {
+      hb_blob_destroy (blob);
+      return NULL;
+    }
+    p->next = NULL;
+    if (pl)
+      pl->next = p;
+    else
+      face->tlist = p;
+    pl = p;
+  }
+  pl->blob = blob;
+  pl->tag = tag;
+
+  unsigned int tlen;
+  const char *d = hb_blob_get_data (blob, &tlen);
+  *len = tlen;
+  return d;
+}
+
+static float hb_gr_get_advance (const void *hb_font, unsigned short gid)
+{
+  return hb_font_get_glyph_h_advance ((hb_font_t *) hb_font, gid);
+}
+
+static void _hb_gr_face_data_destroy (void *data)
+{
+  hb_gr_face_data_t *f = (hb_gr_face_data_t *) data;
+  hb_gr_tablelist_t *tlist = f->tlist;
+  while (tlist)
+  {
+    hb_gr_tablelist_t *old = tlist;
+    hb_blob_destroy (tlist->blob);
+    tlist = tlist->next;
+    free (old);
+  }
+  gr_face_destroy (f->grface);
+}
+
+static void _hb_gr_font_data_destroy (void *data)
+{
+  hb_gr_font_data_t *f = (hb_gr_font_data_t *) data;
+
+  gr_font_destroy (f->grfont);
+}
+
+static hb_user_data_key_t hb_gr_data_key;
+
+static hb_gr_face_data_t *
+_hb_gr_face_get_data (hb_face_t *face)
+{
+  hb_gr_face_data_t *data = (hb_gr_face_data_t *) hb_face_get_user_data (face, &hb_gr_data_key);
+  if (likely (data)) return data;
+
+  data = (hb_gr_face_data_t *) calloc (1, sizeof (hb_gr_face_data_t));
+  if (unlikely (!data))
+    return &_hb_gr_face_data_nil;
+
+
+  hb_blob_t *silf_blob = hb_face_reference_table (face, HB_GRAPHITE_TAG_Silf);
+  if (!hb_blob_get_length (silf_blob))
+  {
+    hb_blob_destroy (silf_blob);
+    return &_hb_gr_face_data_nil;
+  }
+
+  data->face = face;
+  data->grface = gr_make_face (data, &hb_gr_get_table, gr_face_default);
+
+
+  if (unlikely (!hb_face_set_user_data (face, &hb_gr_data_key, data,
+                                        (hb_destroy_func_t) _hb_gr_face_data_destroy,
+                                        FALSE)))
+  {
+    _hb_gr_face_data_destroy (data);
+    data = (hb_gr_face_data_t *) hb_face_get_user_data (face, &hb_gr_data_key);
+    if (data)
+      return data;
+    else
+      return &_hb_gr_face_data_nil;
+  }
+
+  return data;
+}
+
+static hb_gr_font_data_t *
+_hb_gr_font_get_data (hb_font_t *font)
+{
+  hb_gr_font_data_t *data = (hb_gr_font_data_t *) hb_font_get_user_data (font, &hb_gr_data_key);
+  if (likely (data)) return data;
+
+  data = (hb_gr_font_data_t *) calloc (1, sizeof (hb_gr_font_data_t));
+  if (unlikely (!data))
+    return &_hb_gr_font_data_nil;
+
+
+  hb_blob_t *silf_blob = hb_face_reference_table (font->face, HB_GRAPHITE_TAG_Silf);
+  if (!hb_blob_get_length (silf_blob))
+  {
+    hb_blob_destroy (silf_blob);
+    return &_hb_gr_font_data_nil;
+  }
+
+  data->grface = _hb_gr_face_get_data (font->face)->grface;
+  int scale;
+  hb_font_get_scale (font, &scale, NULL);
+  data->grfont = gr_make_font_with_advance_fn (scale, font, &hb_gr_get_advance, data->grface);
+
+
+  if (unlikely (!hb_font_set_user_data (font, &hb_gr_data_key, data,
+                                        (hb_destroy_func_t) _hb_gr_font_data_destroy,
+                                        FALSE)))
+  {
+    _hb_gr_font_data_destroy (data);
+    data = (hb_gr_font_data_t *) hb_font_get_user_data (font, &hb_gr_data_key);
+    if (data)
+      return data;
+    else
+      return &_hb_gr_font_data_nil;
+  }
+
+  return data;
+}
+
+
+hb_bool_t
+hb_graphite_shape (hb_font_t          *font,
+                   hb_buffer_t        *buffer,
+                   const hb_feature_t *features,
+                   unsigned int        num_features,
+                   const char * const *shaper_options)
+{
+
+  buffer->guess_properties ();
+
+  hb_gr_font_data_t *data = _hb_gr_font_get_data (font);
+  if (!data->grface) return FALSE;
+
+  unsigned int charlen;
+  hb_glyph_info_t *bufferi = hb_buffer_get_glyph_infos (buffer, &charlen);
+
+  int success = 0;
+
+  if (!charlen) return TRUE;
+
+  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 (data->grface, lang ? hb_tag_from_string (lang, lang_len) : 0);
+
+  while (num_features--)
+  {
+    const gr_feature_ref *fref = gr_face_find_fref (data->grface, features->tag);
+    if (fref)
+      gr_fref_set_feature_value (fref, features->value, feats);
+    features++;
+  }
+
+  unsigned short *gids = NULL;
+  hb_gr_cluster_t *clusters = NULL;
+  gr_segment *seg = NULL;
+  uint32_t *text = NULL;
+  unsigned short *pg;
+  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 (data->grfont, data->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_gr_cluster_t *) calloc (charlen, sizeof (hb_gr_cluster_t));
+  if (!glyphlen || !clusters) goto dieout;
+
+  gids = (uint16_t *) malloc (glyphlen * sizeof (uint16_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_gr_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 ();
+
+  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, data->grface, data->grfont);
+    pPos->y_advance = gr_slot_advance_Y(is, data->grface, data->grfont);
+//    if (pPos->x_advance < 0 && gr_slot_attached_to(is))
+//      pPos->x_advance = 0;
+    curradvx += pPos->x_advance;
+    curradvy += pPos->y_advance;
+  }
+  pPos[-1].x_advance += gr_seg_advance_X(seg) - curradvx;
+
+  /* TODO(behdad):
+   * This shaper is badly broken with RTL text.  It returns glyphs
+   * in the logical order!
+   */
+//  if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
+//    hb_buffer_reverse (buffer);
+
+  success = 1;
+
+dieout:
+  if (gids) free (gids);
+  if (clusters) free (clusters);
+  if (seg) gr_seg_destroy (seg);
+  if (text) free (text);
+  return success;
+}