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 blink { 35 36 class CompositingReasonFinder; 37 class RenderLayer; 38 class RenderView; 39 40 class CompositingRequirementsUpdater { 41 public: 42 CompositingRequirementsUpdater(RenderView&, CompositingReasonFinder&); 43 ~CompositingRequirementsUpdater(); 44 45 // Recurse through the layers in z-index and overflow order (which is equivalent to painting order) 46 // For the z-order children of a compositing layer: 47 // If a child layers has a compositing layer, then all subsequent layers must 48 // be compositing in order to render above that layer. 49 // 50 // If a child in the negative z-order list is compositing, then the layer itself 51 // must be compositing so that its contents render over that child. 52 // This implies that its positive z-index children must also be compositing. 53 // 54 void update(RenderLayer* root); 55 56 private: 57 class OverlapMap; 58 class RecursionData; 59 60 void updateRecursive(RenderLayer* ancestorLayer, RenderLayer* currentLayer, OverlapMap&, RecursionData&, bool& descendantHas3DTransform, Vector<RenderLayer*>& unclippedDescendants, IntRect& absoluteDecendantBoundingBox); 61 62 RenderView& m_renderView; 63 CompositingReasonFinder& m_compositingReasonFinder; 64 }; 65 66 } // namespace blink 67 68 #endif // CompositingRequirementsUpdater_h 69