cc: Refactor ResourceProvider.

cc/resources/resource_helper.h

+// Copyright 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.
+
+#ifndef CC_RESOURCES_RESOURCE_HELPER_H_
+#define CC_RESOURCES_RESOURCE_HELPER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "cc/base/cc_export.h"
+#include "cc/output/context_provider.h"
+#include "cc/output/output_surface.h"
+#include "third_party/khronos/GLES2/gl2.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
+
+class GrContext;
+
+namespace gpu {
+namespace gles {
+class GLES2Interface;
+}
+}
+
+namespace cc {
+
+class CC_EXPORT ResourceHelper {
+ public:
+  ResourceHelper(OutputSurface* output_surface);
+  ~ResourceHelper();
+
+  // The following class is needed to modify GL resources using GPU
+  // raster. The user must ensure that they only use GPU raster on
+  // GL resources while an instance of this class is alive.
+  class CC_EXPORT ScopedGpuRaster {

[danakj, 2014/07/09 16:01:33]

How about making this a top-level class instead of nesting it?

[sohanjg, 2014/07/10 15:11:06]

Done.

+   public:
+    ScopedGpuRaster(ResourceHelper* resource_helper);
+    ~ScopedGpuRaster();
+
+   private:
+    void BeginGpuRaster();
+    void EndGpuRaster();
+
+    ResourceHelper* resource_helper_;
+
+    DISALLOW_COPY_AND_ASSIGN(ScopedGpuRaster);
+  };
+
+  // Flush all context operations, kicking uploads and ensuring ordering with
+  // respect to other contexts.
+  void Flush();
+
+  // Finish all context operations, causing any pending callbacks to be
+  // scheduled.
+  void Finish();
+
+  static GLint GetActiveTextureUnit(gpu::gles2::GLES2Interface* gl);
+
+  // Only flush the command buffer if supported.
+  // Returns true if the shallow flush occurred, false otherwise.
+  bool ShallowFlushIfSupported();
+
+  // Returns NULL if the output_surface_ does not have a ContextProvider.
+  gpu::gles2::GLES2Interface* ContextGL() const;
+  class GrContext* GrContext() const;
+
+ private:
+  OutputSurface* output_surface_;
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResourceHelper);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RESOURCE_HELPER_H_