dwrite: Initialize GSUB offsets in shaping cache.

dlls/dwrite/dwrite_private.h

@@ -448,6 +448,7 @@ struct scriptshaping_cache
     void *context;
     UINT16 upem;
 
+    struct ot_gsubgpos_table gsub;
     struct ot_gsubgpos_table gpos;
 
     struct

dlls/dwrite/opentype.c

@@ -2942,6 +2942,16 @@ DWRITE_CONTAINER_TYPE opentype_analyze_container_type(void const *data, UINT32 d
 
 void opentype_layout_scriptshaping_cache_init(struct scriptshaping_cache *cache)
 {
+    cache->font->grab_font_table(cache->context, MS_GSUB_TAG, &cache->gsub.table.data, &cache->gsub.table.size,
+            &cache->gsub.table.context);
+
+    if (cache->gsub.table.data)
+    {
+        cache->gsub.script_list = table_read_be_word(&cache->gsub.table, FIELD_OFFSET(struct gpos_gsub_header, script_list));
+        cache->gsub.feature_list = table_read_be_word(&cache->gsub.table, FIELD_OFFSET(struct gpos_gsub_header, feature_list));
+        cache->gsub.lookup_list = table_read_be_word(&cache->gsub.table, FIELD_OFFSET(struct gpos_gsub_header, lookup_list));
+    }
+
     cache->font->grab_font_table(cache->context, MS_GPOS_TAG, &cache->gpos.table.data, &cache->gpos.table.size,
             &cache->gpos.table.context);
 

dlls/dwrite/shape.c

@@ -52,6 +52,7 @@ void release_scriptshaping_cache(struct scriptshaping_cache *cache)
         return;
 
     cache->font->release_font_table(cache->context, cache->gdef.table.context);
+    cache->font->release_font_table(cache->context, cache->gsub.table.context);
     cache->font->release_font_table(cache->context, cache->gpos.table.context);
     heap_free(cache);
 }