/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
*
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
*
* Other contributors:
* Robert O'Callahan <roc+@cs.cmu.edu>
* David Baron <dbaron@fas.harvard.edu>
* Christian Biesinger <cbiesinger@web.de>
* Randall Jesup <rjesup@wgate.com>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Josh Soref <timeless@mac.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
*/
#include "config.h"
#include "core/rendering/RenderLayerBlendInfo.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderLayerModelObject.h"
#include "core/rendering/compositing/CompositedLayerMapping.h"
namespace WebCore {
RenderLayerBlendInfo::RenderLayerBlendInfo(RenderLayerModelObject* renderer)
: m_renderer(renderer)
, m_blendMode(blink::WebBlendModeNormal)
, m_childLayerHasBlendMode(false)
, m_childLayerHasBlendModeStatusDirty(false)
{
}
bool RenderLayerBlendInfo::hasBlendMode() const
{
return RuntimeEnabledFeatures::cssCompositingEnabled() && m_renderer->hasBlendMode();
}
void RenderLayerBlendInfo::updateBlendMode()
{
if (!RuntimeEnabledFeatures::cssCompositingEnabled())
return;
blink::WebBlendMode newBlendMode = m_renderer->style()->blendMode();
if (newBlendMode == m_blendMode)
return;
bool hadBlendMode = m_blendMode != blink::WebBlendModeNormal;
m_blendMode = newBlendMode;
RenderLayer* layer = m_renderer->layer();
// Only update the flag if a blend mode is set or unset.
if (layer->parent() && (!hadBlendMode || !hasBlendMode()))
layer->parent()->blendInfo().dirtyAncestorChainBlendedDescendantStatus();
if (layer->hasCompositedLayerMapping())
layer->compositedLayerMapping()->setBlendMode(newBlendMode);
}
void RenderLayerBlendInfo::dirtyAncestorChainBlendedDescendantStatus()
{
for (RenderLayer* layer = m_renderer->layer(); layer; layer = layer->parent()) {
if (layer->blendInfo().childLayerHasBlendModeStatusDirty())
break;
layer->blendInfo().setChildLayerHasBlendModeStatusDirty(true);
if (layer->stackingNode()->isStackingContext())
break;
}
}
void RenderLayerBlendInfo::setAncestorChainBlendedDescendant()
{
for (RenderLayer* layer = m_renderer->layer(); layer; layer = layer->parent()) {
if (!layer->blendInfo().childLayerHasBlendModeStatusDirty() && layer->blendInfo().childLayerHasBlendMode())
break;
layer->blendInfo().setChildLayerHasBlendMode(true);
layer->blendInfo().setChildLayerHasBlendModeStatusDirty(false);
if (layer->stackingNode()->isStackingContext())
break;
}
}
} // namespace WebCore