command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/common/id_allocator.h

 // Copyright (c) 2012 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.
 
 // This file contains the definition of the IdAllocator class.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
 #define GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_
 
 #include <stdint.h>
@@ skipping 18 matching lines @@
   IdAllocator();
   ~IdAllocator();
 
   // Allocates a new resource ID.
   ResourceId AllocateID();
 
   // Allocates an Id starting at or above desired_id.
   // Note: may wrap if it starts near limit.
   ResourceId AllocateIDAtOrAbove(ResourceId desired_id);
 
+  // Allocates |range| amount of contiguous ids.
+  // Returns the first id to |first_id| or |kInvalidResource| if
+  // allocation failed.
+  ResourceId AllocateIDRange(uint32_t range);
+
   // Marks an id as used. Returns false if id was already used.
   bool MarkAsUsed(ResourceId id);
 
   // Frees a resource ID.
   void FreeID(ResourceId id);
 
+  // Frees a |range| amount of contiguous ids, starting from |first_id|.
+  void FreeIDRange(ResourceId first_id, uint32_t range);
+
   // Checks whether or not a resource ID is in use.
   bool InUse(ResourceId id) const;
 
  private:
   // TODO(gman): This would work much better with ranges or a hash table.
   typedef std::set<ResourceId> ResourceIdSet;
 
   // The highest ID on the used list.
   ResourceId LastUsedId() const;
 
   // Lowest ID that isn't on the used list. This is slow, use as a last resort.
   ResourceId FindFirstUnusedId() const;
 
   ResourceIdSet used_ids_;
   ResourceIdSet free_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(IdAllocator);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_ID_ALLOCATOR_H_