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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 "RenderLayerCompositor.h"
#include "RenderView.h"
namespace WebCore {
bool RenderLayerModelObject::s_wasFloating = false;
bool RenderLayerModelObject::s_hadLayer = false;
bool RenderLayerModelObject::s_hadTransform = false;
bool RenderLayerModelObject::s_layerWasSelfPainting = false;
RenderLayerModelObject::RenderLayerModelObject(Element& element, Ref<RenderStyle>&& style, BaseTypeFlags baseTypeFlags)
: RenderElement(element, WTFMove(style), baseTypeFlags | RenderLayerModelObjectFlag)
{
}
RenderLayerModelObject::RenderLayerModelObject(Document& document, Ref<RenderStyle>&& style, BaseTypeFlags baseTypeFlags)
: RenderElement(document, WTFMove(style), baseTypeFlags | RenderLayerModelObjectFlag)
{
}
RenderLayerModelObject::~RenderLayerModelObject()
{
if (isPositioned()) {
if (style().hasViewportConstrainedPosition())
view().frameView().removeViewportConstrainedObject(this);
}
// 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 = nullptr;
}
void RenderLayerModelObject::createLayer()
{
ASSERT(!m_layer);
m_layer = std::make_unique<RenderLayer>(*this);
setHasLayer(true);
m_layer->insertOnlyThisLayer();
}
bool RenderLayerModelObject::hasSelfPaintingLayer() const
{
return m_layer && m_layer->isSelfPaintingLayer();
}
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.
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
if (oldStyle) {
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 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()
|| oldStyle->filter() != newStyle.filter()
)
layer()->repaintIncludingDescendants();
} else if (newStyle.hasTransform() || newStyle.opacity() < 1 || newStyle.hasFilter() || newStyle.hasBackdropFilter()) {
// 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();
}
}
}
RenderElement::styleWillChange(diff, newStyle);
}
#if ENABLE(CSS_SCROLL_SNAP)
static bool scrollSnapContainerRequiresUpdateForStyleUpdate(const RenderStyle& oldStyle, const RenderStyle& newStyle)
{
return !(oldStyle.scrollSnapType() == newStyle.scrollSnapType()
&& oldStyle.scrollSnapPointsX() == newStyle.scrollSnapPointsX()
&& oldStyle.scrollSnapPointsY() == newStyle.scrollSnapPointsY()
&& oldStyle.scrollSnapDestination() == newStyle.scrollSnapDestination());
}
#endif
void RenderLayerModelObject::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderElement::styleDidChange(diff, oldStyle);
updateFromStyle();
if (requiresLayer()) {
if (!layer() && layerCreationAllowedForSubtree()) {
if (s_wasFloating && isFloating())
setChildNeedsLayout();
createLayer();
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()) {
#if ENABLE(CSS_COMPOSITING)
if (oldStyle->hasBlendMode())
layer()->parent()->dirtyAncestorChainHasBlendingDescendants();
#endif
setHasTransformRelatedProperty(false); // All transform-related propeties force layers, so we know we don't have one or the object doesn't support them.
setHasReflection(false);
// Repaint the about to be destroyed self-painting layer when style change also triggers repaint.
if (layer()->isSelfPaintingLayer() && layer()->repaintStatus() == NeedsFullRepaint)
repaintUsingContainer(containerForRepaint(), layer()->repaintRect());
layer()->removeOnlyThisLayer(); // calls destroyLayer() which clears m_layer
if (s_wasFloating && isFloating())
setChildNeedsLayout();
if (s_hadTransform)
setNeedsLayoutAndPrefWidthsRecalc();
}
if (layer()) {
layer()->styleChanged(diff, oldStyle);
if (s_hadLayer && layer()->isSelfPaintingLayer() != s_layerWasSelfPainting)
setChildNeedsLayout();
}
bool newStyleIsViewportConstrained = style().hasViewportConstrainedPosition();
bool oldStyleIsViewportConstrained = oldStyle && oldStyle->hasViewportConstrainedPosition();
if (newStyleIsViewportConstrained != oldStyleIsViewportConstrained) {
if (newStyleIsViewportConstrained && layer())
view().frameView().addViewportConstrainedObject(this);
else
view().frameView().removeViewportConstrainedObject(this);
}
#if ENABLE(CSS_SCROLL_SNAP)
const RenderStyle& newStyle = style();
if (oldStyle && scrollSnapContainerRequiresUpdateForStyleUpdate(*oldStyle, newStyle)) {
if (RenderLayer* renderLayer = layer()) {
renderLayer->updateSnapOffsets();
renderLayer->updateScrollSnapState();
} else if (isBody() || isDocumentElementRenderer()) {
FrameView& frameView = view().frameView();
frameView.updateSnapOffsets();
frameView.updateScrollSnapState();
frameView.updateScrollingCoordinatorScrollSnapProperties();
}
}
if (oldStyle && oldStyle->scrollSnapCoordinates() != newStyle.scrollSnapCoordinates()) {
const RenderBox* scrollSnapBox = enclosingBox().findEnclosingScrollableContainer();
if (scrollSnapBox && scrollSnapBox->layer()) {
const RenderStyle& style = scrollSnapBox->style();
if (style.scrollSnapType() != ScrollSnapType::None) {
scrollSnapBox->layer()->updateSnapOffsets();
scrollSnapBox->layer()->updateScrollSnapState();
if (scrollSnapBox->isBody() || scrollSnapBox->isDocumentElementRenderer())
scrollSnapBox->view().frameView().updateScrollingCoordinatorScrollSnapProperties();
}
}
}
#endif
}
} // namespace WebCore
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