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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_SURFACE_UNIFIED_H_
#define COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_SURFACE_UNIFIED_H_
#include "components/viz/service/display/output_surface.h"
namespace viz {
// An OutputSurface implementation for the Chrome OS unified desktop display.
// The unified display is a fake display that spans across multiple physical
// displays. The Display/OutputSurface for the unified display exist only to
// issue begin frames and doesn't need to do any drawing work. This class is
// essentially a stub implementation.
//
// OutputSurfaceUnified will end up with a corresponding NullRenderer. While
// Chrome OS uses GL rendering to draw it doesn't matter what renderer is
// created for the unified display because it's never used to draw. Using
// NullRenderer avoids the need to allocate a GL context and command buffer,
// which have significant memory overhead.
class OutputSurfaceUnified : public OutputSurface {
public:
// TODO(kylechar): Add test that uses OutputSurfaceUnified.
OutputSurfaceUnified();
OutputSurfaceUnified(const OutputSurfaceUnified&) = delete;
OutputSurfaceUnified& operator=(const OutputSurfaceUnified&) = delete;
~OutputSurfaceUnified() override;
// OutputSurface implementation.
void BindToClient(OutputSurfaceClient* client) override {}
void EnsureBackbuffer() override {}
void DiscardBackbuffer() override {}
void Reshape(const ReshapeParams& params) override {}
void SwapBuffers(OutputSurfaceFrame frame) override;
void SetUpdateVSyncParametersCallback(
UpdateVSyncParametersCallback callback) override {}
void SetDisplayTransformHint(gfx::OverlayTransform transform) override {}
gfx::OverlayTransform GetDisplayTransform() override;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_DISPLAY_EMBEDDER_OUTPUT_SURFACE_UNIFIED_H_
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