harfbuzz-ng roll

third_party/harfbuzz-ng/src/hb-shape-plan.cc

Index: third_party/harfbuzz-ng/src/hb-shape-plan.cc
diff --git a/third_party/harfbuzz-ng/src/hb-shape-plan.cc b/third_party/harfbuzz-ng/src/hb-shape-plan.cc
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index 0000000000000000000000000000000000000000..038f6af32462840e2634bccd72ccb19a6fc5fd5c
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+++ b/third_party/harfbuzz-ng/src/hb-shape-plan.cc
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+/*
+ * Copyright © 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-private.hh"
+
+#include "hb-shape-plan-private.hh"
+#include "hb-shaper-private.hh"
+#include "hb-font-private.hh"
+
+#define HB_SHAPER_IMPLEMENT(shaper) \
+	HB_SHAPER_DATA_ENSURE_DECLARE(shaper, face) \
+	HB_SHAPER_DATA_ENSURE_DECLARE(shaper, font)
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+
+static void
+hb_shape_plan_plan (hb_shape_plan_t    *shape_plan,
+		    const hb_feature_t *user_features,
+		    unsigned int        num_user_features,
+		    const char * const *shaper_list)
+{
+  const hb_shaper_pair_t *shapers = _hb_shapers_get ();
+
+#define HB_SHAPER_PLAN(shaper) \
+	HB_STMT_START { \
+	  if (hb_##shaper##_shaper_face_data_ensure (shape_plan->face)) { \
+	    HB_SHAPER_DATA (shaper, shape_plan) = \
+	      HB_SHAPER_DATA_CREATE_FUNC (shaper, shape_plan) (shape_plan, user_features, num_user_features); \
+	    shape_plan->shaper_func = _hb_##shaper##_shape; \
+	    return; \
+	  } \
+	} HB_STMT_END
+
+  if (likely (!shaper_list)) {
+    for (unsigned int i = 0; i < HB_SHAPERS_COUNT; i++)
+      if (0)
+	;
+#define HB_SHAPER_IMPLEMENT(shaper) \
+      else if (shapers[i].func == _hb_##shaper##_shape) \
+	HB_SHAPER_PLAN (shaper);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+  } else {
+    for (; *shaper_list; shaper_list++)
+      if (0)
+	;
+#define HB_SHAPER_IMPLEMENT(shaper) \
+      else if (0 == strcmp (*shaper_list, #shaper)) \
+	HB_SHAPER_PLAN (shaper);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+  }
+
+#undef HB_SHAPER_PLAN
+}
+
+
+/*
+ * hb_shape_plan_t
+ */
+
+hb_shape_plan_t *
+hb_shape_plan_create (hb_face_t                     *face,
+		      const hb_segment_properties_t *props,
+		      const hb_feature_t            *user_features,
+		      unsigned int                   num_user_features,
+		      const char * const            *shaper_list)
+{
+  assert (props->direction != HB_DIRECTION_INVALID);
+
+  hb_shape_plan_t *shape_plan;
+
+  if (unlikely (!face))
+    face = hb_face_get_empty ();
+  if (unlikely (!props || hb_object_is_inert (face)))
+    return hb_shape_plan_get_empty ();
+  if (!(shape_plan = hb_object_create<hb_shape_plan_t> ()))
+    return hb_shape_plan_get_empty ();
+
+  hb_face_make_immutable (face);
+  shape_plan->default_shaper_list = shaper_list == NULL;
+  shape_plan->face = hb_face_reference (face);
+  shape_plan->props = *props;
+
+  hb_shape_plan_plan (shape_plan, user_features, num_user_features, shaper_list);
+
+  return shape_plan;
+}
+
+hb_shape_plan_t *
+hb_shape_plan_get_empty (void)
+{
+  static const hb_shape_plan_t _hb_shape_plan_nil = {
+    HB_OBJECT_HEADER_STATIC,
+
+    true, /* default_shaper_list */
+    NULL, /* face */
+    _HB_BUFFER_PROPS_DEFAULT, /* props */
+
+    NULL, /* shaper_func */
+
+    {
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INVALID,
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+    }
+  };
+
+  return const_cast<hb_shape_plan_t *> (&_hb_shape_plan_nil);
+}
+
+hb_shape_plan_t *
+hb_shape_plan_reference (hb_shape_plan_t *shape_plan)
+{
+  return hb_object_reference (shape_plan);
+}
+
+void
+hb_shape_plan_destroy (hb_shape_plan_t *shape_plan)
+{
+  if (!hb_object_destroy (shape_plan)) return;
+
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_DESTROY(shaper, shape_plan);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+  hb_face_destroy (shape_plan->face);
+
+  free (shape_plan);
+}
+
+
+hb_bool_t
+hb_shape_plan_execute (hb_shape_plan      *shape_plan,
+		       hb_font_t          *font,
+		       hb_buffer_t        *buffer,
+		       const hb_feature_t *features,
+		       unsigned int        num_features)
+{
+  if (unlikely (shape_plan->face != font->face))
+    return false;
+
+#define HB_SHAPER_EXECUTE(shaper) \
+	HB_STMT_START { \
+	  return HB_SHAPER_DATA (shaper, shape_plan) && \
+		 hb_##shaper##_shaper_font_data_ensure (font) && \
+		 _hb_##shaper##_shape (shape_plan, font, buffer, features, num_features); \
+	} HB_STMT_END
+
+  if (0)
+    ;
+#define HB_SHAPER_IMPLEMENT(shaper) \
+  else if (shape_plan->shaper_func == _hb_##shaper##_shape) \
+    HB_SHAPER_EXECUTE (shaper);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+#undef HB_SHAPER_EXECUTE
+
+  return false;
+}
+
+
+/*
+ * caching
+ */
+
+#if 0
+static unsigned int
+hb_shape_plan_hash (const hb_shape_plan_t *shape_plan)
+{
+  return hb_segment_properties_hash (&shape_plan->props) +
+	 shape_plan->default_shaper_list ? 0 : (intptr_t) shape_plan->shaper_func;
+}
+#endif
+
+/* TODO no user-feature caching for now. */
+struct hb_shape_plan_proposal_t
+{
+  const hb_segment_properties_t  props;
+  const char * const            *shaper_list;
+  hb_shape_func_t               *shaper_func;
+};
+
+static hb_bool_t
+hb_shape_plan_matches (const hb_shape_plan_t          *shape_plan,
+		       const hb_shape_plan_proposal_t *proposal)
+{
+  return hb_segment_properties_equal (&shape_plan->props, &proposal->props) &&
+	 ((shape_plan->default_shaper_list && proposal->shaper_list == NULL) ||
+	  (shape_plan->shaper_func == proposal->shaper_func));
+}
+
+hb_shape_plan_t *
+hb_shape_plan_create_cached (hb_face_t                     *face,
+			     const hb_segment_properties_t *props,
+			     const hb_feature_t            *user_features,
+			     unsigned int                   num_user_features,
+			     const char * const            *shaper_list)
+{
+  if (num_user_features)
+    return hb_shape_plan_create (face, props, user_features, num_user_features, shaper_list);
+
+  hb_shape_plan_proposal_t proposal = {
+    *props,
+    shaper_list,
+    NULL
+  };
+
+  if (shaper_list) {
+    /* Choose shaper.  Adapted from hb_shape_plan_plan(). */
+#define HB_SHAPER_PLAN(shaper) \
+	  HB_STMT_START { \
+	    if (hb_##shaper##_shaper_face_data_ensure (face)) \
+	      proposal.shaper_func = _hb_##shaper##_shape; \
+	  } HB_STMT_END
+
+    for (const char * const *shaper_item = shaper_list; *shaper_item; shaper_item++)
+      if (0)
+	;
+#define HB_SHAPER_IMPLEMENT(shaper) \
+      else if (0 == strcmp (*shaper_item, #shaper)) \
+	HB_SHAPER_PLAN (shaper);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+#undef HB_SHAPER_PLAN
+
+    if (unlikely (!proposal.shaper_list))
+      return hb_shape_plan_get_empty ();
+  }
+
+
+retry:
+  hb_face_t::plan_node_t *cached_plan_nodes = (hb_face_t::plan_node_t *) hb_atomic_ptr_get (&face->shape_plans);
+  for (hb_face_t::plan_node_t *node = cached_plan_nodes; node; node = node->next)
+    if (hb_shape_plan_matches (node->shape_plan, &proposal))
+      return hb_shape_plan_reference (node->shape_plan);
+
+  /* Not found. */
+
+  hb_shape_plan_t *shape_plan = hb_shape_plan_create (face, props, user_features, num_user_features, shaper_list);
+
+  hb_face_t::plan_node_t *node = (hb_face_t::plan_node_t *) calloc (1, sizeof (hb_face_t::plan_node_t));
+  if (unlikely (!node))
+    return shape_plan;
+
+  node->shape_plan = shape_plan;
+  node->next = cached_plan_nodes;
+
+  if (!hb_atomic_ptr_cmpexch (&face->shape_plans, cached_plan_nodes, node)) {
+    hb_shape_plan_destroy (shape_plan);
+    free (node);
+    goto retry;
+  }
+
+  /* Release our reference on face. */
+  hb_face_destroy (face);
+
+  return hb_shape_plan_reference (shape_plan);
+}