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// Copyright (c) 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.
#include "base/callback_forward.h"
#include "ui/compositor/compositor_export.h"
namespace gfx {
class Canvas;
class Rect;
namespace ui {
// A delegate interface implemented by an object that renders to a Layer.
class COMPOSITOR_EXPORT LayerDelegate {
// Paint content for the layer to the specified canvas. It has already been
// clipped to the Layer's invalid rect.
virtual void OnPaintLayer(gfx::Canvas* canvas) = 0;
// A notification that this layer has had a delegated frame swap and
// will be repainted.
virtual void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) = 0;
// Called when the layer's device scale factor has changed.
virtual void OnDeviceScaleFactorChanged(float device_scale_factor) = 0;
// Invoked prior to the bounds changing. The returned closured is run after
// the bounds change.
virtual base::Closure PrepareForLayerBoundsChange() = 0;
virtual ~LayerDelegate() {}
} // namespace ui