Implement SharedQuadStateList StructTraits

cc/ipc/shared_quad_state_struct_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_
 #define CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_
 
 #include "cc/ipc/shared_quad_state.mojom.h"
 #include "cc/quads/shared_quad_state.h"
 
@@ skipping 44 matching lines @@
     out->is_clipped = data.is_clipped();
     out->opacity = data.opacity();
     if (data.blend_mode() > SkXfermode::kLastMode)
       return false;
     out->blend_mode = static_cast<SkXfermode::Mode>(data.blend_mode());
     out->sorting_context_id = data.sorting_context_id();
     return true;
   }
 };
 
+struct SharedQuadStateListArray {
+  cc::SharedQuadStateList* list;
+};
+
+template <>
+struct ArrayTraits<SharedQuadStateListArray> {
+  using Element = cc::SharedQuadState;
+  using Iterator = cc::SharedQuadStateList::Iterator;
+  using ConstIterator = cc::SharedQuadStateList::ConstIterator;
+
+  static ConstIterator GetBegin(const SharedQuadStateListArray& input) {
+    return input.list->begin();
+  }
+  static Iterator GetBegin(SharedQuadStateListArray& input) {
+    return input.list->begin();
+  }
+  static void AdvanceIterator(ConstIterator& iterator) { ++iterator; }
+  static void AdvanceIterator(Iterator& iterator) { ++iterator; }
+  static const Element& GetValue(ConstIterator& iterator) { return **iterator; }
+  static Element& GetValue(Iterator& iterator) { return **iterator; }
+  static size_t GetSize(const SharedQuadStateListArray& input) {
+    return input.list->size();
+  }
+  static bool Resize(SharedQuadStateListArray& input, size_t size) {
+    if (input.list->size() == size)
+      return true;
+    input.list->clear();
+    for (size_t i = 0; i < size; ++i)
+      input.list->AllocateAndConstruct<cc::SharedQuadState>();
+    return true;
+  }
+};
+
+template <>
+struct StructTraits<cc::mojom::SharedQuadStateList, cc::SharedQuadStateList> {
+  static SharedQuadStateListArray shared_quad_states(
+      const cc::SharedQuadStateList& list) {
+    return {const_cast<cc::SharedQuadStateList*>(&list)};
+  }
+
+  static bool Read(cc::mojom::SharedQuadStateListDataView data,
+                   cc::SharedQuadStateList* out) {
+    SharedQuadStateListArray sqs_array = {out};
+    return data.ReadSharedQuadStates(&sqs_array);
+  }
+};
+
 }  // namespace mojo
 
 #endif  // CC_IPC_SHARED_QUAD_STATE_STRUCT_TRAITS_H_