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// Copyright 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 UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_
#define UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_
#include <vector>
#include "base/basictypes.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/ozone/ozone_base_export.h"
#include "ui/ozone/public/surface_factory_ozone.h"
namespace ui {
// This class can be used to answer questions about possible overlay
// configurations for a particular output device. We get an instance of this
// class from SurfaceFactoryOzone given an AcceleratedWidget.
class OZONE_BASE_EXPORT OverlayCandidatesOzone {
public:
struct OverlaySurfaceCandidate {
OverlaySurfaceCandidate();
~OverlaySurfaceCandidate();
// Transformation to apply to layer during composition.
gfx::OverlayTransform transform;
// Format of the buffer to composite.
SurfaceFactoryOzone::BufferFormat format;
// Rect on the display to position the overlay to. Input rectangle may
// not have integer coordinates, but when accepting for overlay, must
// be modified by CheckOverlaySupport to output integer values.
gfx::RectF display_rect;
// Crop within the buffer to be placed inside |display_rect|.
gfx::RectF crop_rect;
// Stacking order of the overlay plane relative to the main surface,
// which is 0. Signed to allow for "underlays".
int plane_z_order;
// To be modified by the implementer if this candidate can go into
// an overlay.
bool overlay_handled;
};
typedef std::vector<OverlaySurfaceCandidate> OverlaySurfaceCandidateList;
// A list of possible overlay candidates is presented to this function.
// The expected result is that those candidates that can be in a separate
// plane are marked with |overlay_handled| set to true, otherwise they are
// to be traditionally composited. When setting |overlay_handled| to true,
// the implementation must also snap |display_rect| to integer coordinates
// if necessary.
virtual void CheckOverlaySupport(OverlaySurfaceCandidateList* surfaces);
virtual ~OverlayCandidatesOzone();
};
} // namespace ui
#endif // UI_OZONE_PUBLIC_OVERLAY_CANDIDATES_OZONE_H_
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