2 * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
4 * Portions are Copyright (C) 1998 Netscape Communications Corporation.
7 * Robert O'Callahan <roc+@cs.cmu.edu>
8 * David Baron <dbaron@fas.harvard.edu>
9 * Christian Biesinger <cbiesinger@web.de>
10 * Randall Jesup <rjesup@wgate.com>
11 * Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
12 * Josh Soref <timeless@mac.com>
13 * Boris Zbarsky <bzbarsky@mit.edu>
15 * This library is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU Lesser General Public
17 * License as published by the Free Software Foundation; either
18 * version 2.1 of the License, or (at your option) any later version.
20 * This library is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * Lesser General Public License for more details.
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29 * Alternatively, the contents of this file may be used under the terms
30 * of either the Mozilla Public License Version 1.1, found at
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45 #include "core/rendering/RenderLayerBlendInfo.h"
47 #include "core/rendering/RenderLayer.h"
48 #include "core/rendering/RenderLayerModelObject.h"
49 #include "core/rendering/compositing/CompositedLayerMapping.h"
53 RenderLayerBlendInfo::RenderLayerBlendInfo(RenderLayerModelObject& renderer)
54 : m_renderer(renderer)
55 , m_blendMode(blink::WebBlendModeNormal)
56 , m_childLayerHasBlendMode(false)
57 , m_childLayerHasBlendModeStatusDirty(false)
61 bool RenderLayerBlendInfo::hasBlendMode() const
63 return RuntimeEnabledFeatures::cssCompositingEnabled() && m_renderer.hasBlendMode();
66 void RenderLayerBlendInfo::updateBlendMode()
68 if (!RuntimeEnabledFeatures::cssCompositingEnabled())
71 blink::WebBlendMode newBlendMode = m_renderer.style()->blendMode();
72 if (newBlendMode == m_blendMode)
75 bool hadBlendMode = m_blendMode != blink::WebBlendModeNormal;
76 m_blendMode = newBlendMode;
78 RenderLayer* layer = m_renderer.layer();
79 // Only update the flag if a blend mode is set or unset.
80 if (layer->parent() && (!hadBlendMode || !hasBlendMode()))
81 layer->parent()->blendInfo().dirtyAncestorChainBlendedDescendantStatus();
83 if (layer->hasCompositedLayerMapping())
84 layer->compositedLayerMapping()->setBlendMode(newBlendMode);
87 void RenderLayerBlendInfo::dirtyAncestorChainBlendedDescendantStatus()
89 for (RenderLayer* layer = m_renderer.layer(); layer; layer = layer->parent()) {
90 if (layer->blendInfo().childLayerHasBlendModeStatusDirty())
93 layer->blendInfo().setChildLayerHasBlendModeStatusDirty(true);
95 if (layer->stackingNode()->isStackingContext())
100 void RenderLayerBlendInfo::setAncestorChainBlendedDescendant()
102 for (RenderLayer* layer = m_renderer.layer(); layer; layer = layer->parent()) {
103 if (!layer->blendInfo().childLayerHasBlendModeStatusDirty() && layer->blendInfo().childLayerHasBlendMode())
106 layer->blendInfo().setChildLayerHasBlendMode(true);
107 layer->blendInfo().setChildLayerHasBlendModeStatusDirty(false);
109 if (layer->stackingNode()->isStackingContext())
114 } // namespace WebCore