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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_HOST_ROOT_WINDOW_TRANSFORMER_H_
#define ASH_HOST_ROOT_WINDOW_TRANSFORMER_H_
#include "ash/ash_export.h"
namespace gfx {
class Insets;
class Rect;
class Size;
class Transform;
}
namespace ash {
// RootWindowTransformer controls how RootWindow should be placed and
// transformed inside the host window.
class ASH_EXPORT RootWindowTransformer {
public:
virtual ~RootWindowTransformer() {}
// Returns the transform that converts root window coordinates in DIP to
// host (platform) window coordinates. The transform normally includes
// rotation and scaling, except for unified desktop, which doesn't include
// rotation.
virtual gfx::Transform GetTransform() const = 0;
// Returns the inverse of the transform above. This method is to
// provide 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;
// Returns the transform for applying host insets and magnifier scale. It is
// similar to GetTransform() but without the screen rotation.
virtual gfx::Transform GetInsetsAndScaleTransform() const = 0;
};
} // namespace ash
#endif // ASH_HOST_ROOT_WINDOW_TRANSFORMER_H_
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