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// Copyright (c) 2013 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.
#include "ui/aura/aura_export.h"
namespace gfx {
class Insets;
class Rect;
class Size;
class Transform;
namespace aura {
// RootWindowTransformer controls how RootWindow should be placed and
// transformed inside the host window.
class AURA_EXPORT RootWindowTransformer {
virtual ~RootWindowTransformer() {}
// Returns the transform the root window in DIP.
virtual gfx::Transform GetTransform() const = 0;
// Returns the inverse of the transform above. This method is to
// provie an accurate inverse of the transform because the result of
// |gfx::Transform::GetInverse| may contains computational error.
virtual gfx::Transform GetInverseTransform() const = 0;
// Returns the root window's bounds for given host window size in DIP.
// This is necessary to handle the case where the root window's size
// is bigger than the host window. (Screen magnifier for example).
virtual gfx::Rect GetRootWindowBounds(const gfx::Size& host_size) const = 0;
// Returns the insets that specifies the effective area of
// the host window.
virtual gfx::Insets GetHostInsets() const = 0;
} // namespace aura