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      1 /*
      2  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
      3  * Copyright (C) 2014 Google Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef CompositingRequirementsUpdater_h
     28 #define CompositingRequirementsUpdater_h
     29 
     30 #include "platform/geometry/IntRect.h"
     31 #include "platform/graphics/CompositingReasons.h"
     32 #include "wtf/Vector.h"
     33 
     34 namespace WebCore {
     35 
     36 class CompositingReasonFinder;
     37 class RenderLayer;
     38 class RenderObject;
     39 class RenderView;
     40 
     41 class CompositingRequirementsUpdater {
     42 public:
     43     CompositingRequirementsUpdater(RenderView&, CompositingReasonFinder&);
     44     ~CompositingRequirementsUpdater();
     45 
     46     //  Recurse through the layers in z-index and overflow order (which is equivalent to painting order)
     47     //  For the z-order children of a compositing layer:
     48     //      If a child layers has a compositing layer, then all subsequent layers must
     49     //      be compositing in order to render above that layer.
     50     //
     51     //      If a child in the negative z-order list is compositing, then the layer itself
     52     //      must be compositing so that its contents render over that child.
     53     //      This implies that its positive z-index children must also be compositing.
     54     //
     55     void update(RenderLayer* root);
     56 
     57 private:
     58     class OverlapMap;
     59     class RecursionData;
     60 
     61     void updateRecursive(RenderLayer* ancestorLayer, RenderLayer* currentLayer, OverlapMap&, RecursionData&, bool& descendantHas3DTransform, Vector<RenderLayer*>& unclippedDescendants, IntRect& absoluteDecendantBoundingBox);
     62     bool isRunningAcceleratedTransformAnimation(RenderObject*) const;
     63 
     64     RenderView& m_renderView;
     65     CompositingReasonFinder& m_compositingReasonFinder;
     66 };
     67 
     68 } // namespace WebCore
     69 
     70 #endif // CompositingRequirementsUpdater_h
     71