sky/engine/core/rendering/PaintInvalidationState.h

// 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 SKY_ENGINE_CORE_RENDERING_PAINTINVALIDATIONSTATE_H_
#define SKY_ENGINE_CORE_RENDERING_PAINTINVALIDATIONSTATE_H_

#include "sky/engine/platform/geometry/LayoutRect.h"
#include "sky/engine/wtf/Noncopyable.h"

namespace blink {

class RenderBox;
class RenderInline;
class RenderLayerModelObject;
class RenderObject;
class RenderView;

class PaintInvalidationState {
    WTF_MAKE_NONCOPYABLE(PaintInvalidationState);
public:
    PaintInvalidationState(const PaintInvalidationState& next, RenderLayerModelObject& renderer, const RenderLayerModelObject& paintInvalidationContainer);

    explicit PaintInvalidationState(const RenderView&);

    const LayoutRect& clipRect() const { return m_clipRect; }
    const LayoutSize& paintOffset() const { return m_paintOffset; }

    bool cachedOffsetsEnabled() const { return m_cachedOffsetsEnabled; }
    bool isClipped() const { return m_clipped; }

    bool forceCheckForPaintInvalidation() const { return m_forceCheckForPaintInvalidation; }
    void setForceCheckForPaintInvalidation() { m_forceCheckForPaintInvalidation = true; }

    const RenderLayerModelObject& paintInvalidationContainer() const { return m_paintInvalidationContainer; }
    const RenderObject& renderer() const { return m_renderer; }

    bool canMapToContainer(const RenderLayerModelObject* container) const
    {
        return m_cachedOffsetsEnabled && container == &m_paintInvalidationContainer;
    }
private:
    void applyClipIfNeeded(const RenderObject&);

    friend class ForceHorriblySlowRectMapping;

    bool m_clipped;
    mutable bool m_cachedOffsetsEnabled;
    bool m_forceCheckForPaintInvalidation;

    LayoutRect m_clipRect;

    // x/y offset from paint invalidation container. Includes relative positioning and scroll offsets.
    LayoutSize m_paintOffset;

    const RenderLayerModelObject& m_paintInvalidationContainer;

    const RenderObject& m_renderer;
};

} // namespace blink

#endif  // SKY_ENGINE_CORE_RENDERING_PAINTINVALIDATIONSTATE_H_