Roll HarfBuzz to 1.4.6

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

 /*
  * 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 "hb-graphite2.h"
 
 #include <graphite2/Segment.h>
 
 
-HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, face)
-HB_SHAPER_DATA_ENSURE_DECLARE(graphite2, font)
+HB_SHAPER_DATA_ENSURE_DEFINE(graphite2, face)
+HB_SHAPER_DATA_ENSURE_DEFINE(graphite2, font)
 
 
 /*
  * shaper face data
  */
 
 typedef struct hb_graphite2_tablelist_t {
   struct hb_graphite2_tablelist_t *next;
   hb_blob_t *blob;
   unsigned int tag;
@@ skipping 96 matching lines @@
 {
   if (unlikely (!hb_graphite2_shaper_face_data_ensure (face))) return NULL;
   return HB_SHAPER_DATA_GET (face)->grface;
 }
 
 
 /*
  * 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);
-}
+struct hb_graphite2_shaper_font_data_t {};
 
 hb_graphite2_shaper_font_data_t *
-_hb_graphite2_shaper_font_data_create (hb_font_t *font)
+_hb_graphite2_shaper_font_data_create (hb_font_t *font HB_UNUSED)
 {
-  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);
+  return (hb_graphite2_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
 }
 
 void
-_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data)
+_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data HB_UNUSED)
 {
-  gr_font_destroy (data);
 }
 
 /*
  * Since: 0.9.10
  */
 gr_font *
 hb_graphite2_font_get_gr_font (hb_font_t *font)
 {
-  if (unlikely (!hb_graphite2_shaper_font_data_ensure (font))) return NULL;
-  return HB_SHAPER_DATA_GET (font);
+  return NULL;
 }
 
 
 /*
  * shaper shape_plan data
  */
 
 struct hb_graphite2_shaper_shape_plan_data_t {};
 
 hb_graphite2_shaper_shape_plan_data_t *
@@ skipping 27 matching lines @@
 
 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);
 
   const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
   const char *lang_end = lang ? strchr (lang, '-') : NULL;
   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)
@@ skipping 11 matching lines @@
   uint32_t *chars = (uint32_t *) scratch;
 
   for (unsigned int i = 0; i < buffer->len; ++i)
     chars[i] = buffer->info[i].codepoint;
 
   /* TODO ensure_native_direction. */
 
   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,
+  seg = gr_make_seg (NULL, grface,
                      script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1],
                      feats,
                      gr_utf32, chars, buffer->len,
                      2 | (hb_buffer_get_direction (buffer) == HB_DIRECTION_RTL ? 1 : 0));
 
   if (unlikely (!seg)) {
     if (feats) gr_featureval_destroy (feats);
     return false;
   }
 
@@ skipping 30 matching lines @@
 
   ALLOCATE_ARRAY (hb_graphite2_cluster_t, clusters, buffer->len);
   ALLOCATE_ARRAY (hb_codepoint_t, gids, glyph_count);
 
 #undef ALLOCATE_ARRAY
 
   memset (clusters, 0, sizeof (clusters[0]) * buffer->len);
 
   hb_codepoint_t *pg = gids;
   clusters[0].cluster = buffer->info[0].cluster;
-  float curradv = HB_DIRECTION_IS_BACKWARD(buffer->props.direction) ? gr_slot_origin_X(gr_seg_first_slot(seg)) : 0.;
+  float curradv = 0.;
   if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
   {
     curradv = gr_slot_origin_X(gr_seg_first_slot(seg));
     clusters[0].advance = gr_seg_advance_X(seg) - curradv;
   }
   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(buffer->props.direction))
-      {
-        ci++;
-        clusters[ci].advance = curradv - gr_slot_origin_X(is);
-      } else {
+        c->advance = curradv - gr_slot_origin_X(is);
+      else
         clusters[ci].advance = gr_slot_origin_X(is) - curradv;
-        ci++;
-      }
+      ci++;
       curradv = gr_slot_origin_X(is);
     }
     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(buffer->props.direction))
+  if (HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
+    clusters[ci].advance += curradv;
+  else
     clusters[ci].advance = gr_seg_advance_X(seg) - 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;
 
-  float yscale = font->y_scale / font->x_scale;
+  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;
   /* Positioning. */
+  int currclus = -1;
+  const hb_glyph_info_t *info = buffer->info;
+  hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, NULL);
   if (!HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
   {
-    int currclus = -1;
-    const hb_glyph_info_t *info = buffer->info;
-    hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, NULL);
     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) - curradvx;
+      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;
+        pPos->x_advance = info->var1.i32 * xscale;
         curradvx += pPos->x_advance;
         currclus = info->cluster;
       } else
         pPos->x_advance = 0.;
 
-      pPos->y_advance = gr_slot_advance_Y (is, grface, grfont) * yscale;
+      pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
       curradvy += pPos->y_advance;
     }
   }
   else
   {
-    int currclus = -1;
-    const hb_glyph_info_t *info = buffer->info;
-    hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, NULL);
     curradvx = gr_seg_advance_X(seg);
     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;
-        if (currclus != -1) curradvx -= info[-1].var1.i32;
+        pPos->x_advance = info->var1.i32 * xscale;
+        curradvx -= pPos->x_advance;
         currclus = info->cluster;
       } else
-      pPos->x_advance = 0.;
+        pPos->x_advance = 0.;
 
-      pPos->y_advance = gr_slot_advance_Y (is, grface, grfont) * yscale;
+      pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
       curradvy -= pPos->y_advance;
-      pPos->x_offset = gr_slot_origin_X (is) - curradvx + pPos->x_advance;
+      pPos->x_offset = (gr_slot_origin_X (is) - info->var1.i32) * xscale - 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);
 
   return true;
 }