command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/command_buffer/service/path_manager.h

+// Copyright (c) 2014 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 GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+// This class keeps track of paths and their client and service ids
+// so we can correctly clear them.
+class GPU_EXPORT PathManager {
+ public:
+  PathManager();
+  ~PathManager();
+
+  // Must call before destruction.
+  void Destroy(bool have_context);
+
+  // Creates a path
+  void CreatePath(GLuint client_id, GLuint service_id);
+
+  // Gets the path.  Returns false if path not found
+  bool GetPath(GLuint client_id, GLuint* service_id = NULL);
+
+  // Removes a range of paths
+  void RemovePaths(GLuint path, GLuint range);
+
+ private:
+  // Info for each path in the system.
+  typedef base::hash_map<GLuint, GLuint> PathMap;
+  PathMap path_map_;
+
+  bool have_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(PathManager);
+};
+
+}  // namespace gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_