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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2010, 2012 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "RenderLayerModelObject.h"
#include "RenderLayer.h"
#include "RenderView.h"
using namespace std;
namespace WebCore {
bool RenderLayerModelObject::s_wasFloating = false;
bool RenderLayerModelObject::s_hadLayer = false;
bool RenderLayerModelObject::s_hadTransform = false;
bool RenderLayerModelObject::s_layerWasSelfPainting = false;
RenderLayerModelObject::RenderLayerModelObject(ContainerNode* node)
: RenderObject(node)
, m_layer(0)
{
}
RenderLayerModelObject::~RenderLayerModelObject()
{
// Our layer should have been destroyed and cleared by now
ASSERT(!hasLayer());
ASSERT(!m_layer);
}
void RenderLayerModelObject::destroyLayer()
{
ASSERT(!hasLayer()); // Callers should have already called setHasLayer(false)
ASSERT(m_layer);
m_layer->destroy(renderArena());
m_layer = 0;
}
void RenderLayerModelObject::ensureLayer()
{
if (m_layer)
return;
m_layer = new (renderArena()) RenderLayer(this);
setHasLayer(true);
m_layer->insertOnlyThisLayer();
}
bool RenderLayerModelObject::hasSelfPaintingLayer() const
{
return m_layer && m_layer->isSelfPaintingLayer();
}
void RenderLayerModelObject::willBeDestroyed()
{
if (isPositioned()) {
// Don't use this->view() because the document's renderView has been set to 0 during destruction.
if (Frame* frame = this->frame()) {
if (FrameView* frameView = frame->view()) {
if (style()->hasViewportConstrainedPosition())
frameView->removeViewportConstrainedObject(this);
}
}
}
// RenderObject::willBeDestroyed calls back to destroyLayer() for layer destruction
RenderObject::willBeDestroyed();
}
void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
s_wasFloating = isFloating();
s_hadLayer = hasLayer();
s_hadTransform = hasTransform();
if (s_hadLayer)
s_layerWasSelfPainting = layer()->isSelfPaintingLayer();
// If our z-index changes value or our visibility changes,
// we need to dirty our stacking context's z-order list.
RenderStyle* oldStyle = style();
if (oldStyle && newStyle) {
if (parent()) {
// Do a repaint with the old style first, e.g., for example if we go from
// having an outline to not having an outline.
if (diff == StyleDifferenceRepaintLayer) {
layer()->repaintIncludingDescendants();
if (!(oldStyle->clip() == newStyle->clip()))
layer()->clearClipRectsIncludingDescendants();
} else if (diff == StyleDifferenceRepaint || newStyle->outlineSize() < oldStyle->outlineSize())
repaint();
}
if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) {
// When a layout hint happens, we go ahead and do a repaint of the layer, since the layer could
// end up being destroyed.
if (hasLayer()) {
if (oldStyle->position() != newStyle->position()
|| oldStyle->zIndex() != newStyle->zIndex()
|| oldStyle->hasAutoZIndex() != newStyle->hasAutoZIndex()
|| !(oldStyle->clip() == newStyle->clip())
|| oldStyle->hasClip() != newStyle->hasClip()
|| oldStyle->opacity() != newStyle->opacity()
|| oldStyle->transform() != newStyle->transform()
#if ENABLE(CSS_FILTERS)
|| oldStyle->filter() != newStyle->filter()
#endif
)
layer()->repaintIncludingDescendants();
} else if (newStyle->hasTransform() || newStyle->opacity() < 1 || newStyle->hasFilter()) {
// If we don't have a layer yet, but we are going to get one because of transform or opacity,
// then we need to repaint the old position of the object.
repaint();
}
}
}
RenderObject::styleWillChange(diff, newStyle);
}
void RenderLayerModelObject::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderObject::styleDidChange(diff, oldStyle);
updateFromStyle();
if (requiresLayer()) {
if (!layer() && layerCreationAllowedForSubtree()) {
if (s_wasFloating && isFloating())
setChildNeedsLayout(true);
ensureLayer();
if (parent() && !needsLayout() && containingBlock()) {
layer()->setRepaintStatus(NeedsFullRepaint);
// There is only one layer to update, it is not worth using |cachedOffset| since
// we are not sure the value will be used.
layer()->updateLayerPositions(0);
}
}
} else if (layer() && layer()->parent()) {
setHasTransform(false); // Either a transform wasn't specified or the object doesn't support transforms, so just null out the bit.
setHasReflection(false);
layer()->removeOnlyThisLayer(); // calls destroyLayer() which clears m_layer
if (s_wasFloating && isFloating())
setChildNeedsLayout(true);
if (s_hadTransform)
setNeedsLayoutAndPrefWidthsRecalc();
}
if (layer()) {
layer()->styleChanged(diff, oldStyle);
if (s_hadLayer && layer()->isSelfPaintingLayer() != s_layerWasSelfPainting)
setChildNeedsLayout(true);
}
if (FrameView *frameView = view()->frameView()) {
bool newStyleIsViewportConstained = style()->hasViewportConstrainedPosition();
bool oldStyleIsViewportConstrained = oldStyle && oldStyle->hasViewportConstrainedPosition();
if (newStyleIsViewportConstained != oldStyleIsViewportConstrained) {
if (newStyleIsViewportConstained && layer())
frameView->addViewportConstrainedObject(this);
else
frameView->removeViewportConstrainedObject(this);
}
}
}
} // namespace WebCore
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