зеркало из https://github.com/mozilla/pjs.git
724 строки
24 KiB
C++
724 строки
24 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Novell code.
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*
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* The Initial Developer of the Novell Code is Novell Corporation.
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* Portions created by Novell are Copyright (C) 2005 Novell. All Rights Reserved.
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*
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* Contributor(s):
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* robert@ocallahan.org
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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*/
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#include "nsDisplayList.h"
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#include "nsCSSRendering.h"
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#include "nsISelectionController.h"
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#include "nsIPresShell.h"
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#include "nsRegion.h"
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#include "nsIViewManager.h"
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#include "nsIBlender.h"
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#include "nsTransform2D.h"
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nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
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PRBool aIsForEvents, nsIFrame* aMovingFrame)
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: mReferenceFrame(aReferenceFrame),
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mMovingFrame(aMovingFrame),
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mIgnoreScrollFrame(nsnull),
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mEventDelivery(aIsForEvents),
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mIsAtRootOfPseudoStackingContext(PR_FALSE) {
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PL_InitArenaPool(&mPool, "displayListArena", 1024, sizeof(void*)-1);
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nsPresContext* pc = aReferenceFrame->GetPresContext();
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nsIPresShell *shell = pc->PresShell();
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PRBool suppressed;
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shell->IsPaintingSuppressed(&suppressed);
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mIsBackgroundOnly = suppressed;
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if (pc->IsRenderingOnlySelection()) {
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nsCOMPtr<nsISelectionController> selcon(do_QueryInterface(shell));
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if (selcon) {
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selcon->GetSelection(nsISelectionController::SELECTION_NORMAL,
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getter_AddRefs(mBoundingSelection));
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}
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}
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}
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nsDisplayListBuilder::~nsDisplayListBuilder() {
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PL_FreeArenaPool(&mPool);
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PL_FinishArenaPool(&mPool);
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}
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void*
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nsDisplayListBuilder::Allocate(size_t aSize) {
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void *tmp;
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PL_ARENA_ALLOCATE(tmp, &mPool, aSize);
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return tmp;
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}
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void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const
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{
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aDestination.BorderBackground()->AppendToTop(BorderBackground());
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aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds());
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aDestination.Floats()->AppendToTop(Floats());
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aDestination.Content()->AppendToTop(Content());
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aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants());
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aDestination.Outlines()->AppendToTop(Outlines());
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}
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// Suitable for leaf items only, overridden by nsDisplayWrapList
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PRBool
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nsDisplayItem::OptimizeVisibility(nsDisplayListBuilder* aBuilder,
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nsRegion* aVisibleRegion) {
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nsRect bounds = GetBounds(aBuilder);
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if (!aVisibleRegion->Intersects(bounds))
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return PR_FALSE;
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nsIFrame* f = GetUnderlyingFrame();
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NS_ASSERTION(f, "GetUnderlyingFrame() must return non-null for leaf items");
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if (aBuilder->HasMovingFrames() && aBuilder->IsMovingFrame(f)) {
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// If this frame is in the moving subtree, and it doesn't
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// require repainting just because it's moved, then just remove it now
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// because it's not relevant.
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if (!IsVaryingRelativeToFrame(aBuilder, aBuilder->GetRootMovingFrame()))
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return PR_FALSE;
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// keep it, but don't let it cover other display items (see nsLayoutUtils::
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// ComputeRepaintRegionForCopy)
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return PR_TRUE;
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}
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if (IsOpaque(aBuilder)) {
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aVisibleRegion->SimpleSubtract(bounds);
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}
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return PR_TRUE;
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}
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void
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nsDisplayList::FlattenTo(nsVoidArray* aElements) {
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nsDisplayItem* item;
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while ((item = RemoveBottom()) != nsnull) {
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if (item->GetType() == nsDisplayItem::TYPE_WRAPLIST) {
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item->GetList()->FlattenTo(aElements);
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item->nsDisplayItem::~nsDisplayItem();
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} else {
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aElements->AppendElement(item);
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}
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}
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}
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void
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nsDisplayList::OptimizeVisibility(nsDisplayListBuilder* aBuilder,
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nsRegion* aVisibleRegion) {
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nsVoidArray elements;
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FlattenTo(&elements);
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for (PRInt32 i = elements.Count() - 1; i >= 0; --i) {
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nsDisplayItem* item = NS_STATIC_CAST(nsDisplayItem*, elements.ElementAt(i));
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nsDisplayItem* belowItem = i < 1 ? nsnull :
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NS_STATIC_CAST(nsDisplayItem*, elements.ElementAt(i - 1));
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if (belowItem && item->TryMerge(aBuilder, belowItem)) {
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belowItem->nsDisplayItem::~nsDisplayItem();
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elements.ReplaceElementAt(item, i - 1);
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continue;
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}
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if (item->OptimizeVisibility(aBuilder, aVisibleRegion)) {
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AppendToBottom(item);
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} else {
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item->nsDisplayItem::~nsDisplayItem();
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}
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}
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}
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void nsDisplayList::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
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const nsRect& aDirtyRect) const {
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for (nsDisplayItem* i = GetBottom(); i != nsnull; i = i->GetAbove()) {
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i->Paint(aBuilder, aCtx, aDirtyRect);
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}
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}
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PRUint32 nsDisplayList::Count() const {
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PRUint32 count = 0;
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for (nsDisplayItem* i = GetBottom(); i; i = i->GetAbove()) {
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++count;
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}
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return count;
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}
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nsDisplayItem* nsDisplayList::RemoveBottom() {
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nsDisplayItem* item = mSentinel.mAbove;
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if (!item)
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return nsnull;
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mSentinel.mAbove = item->mAbove;
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if (item == mTop) {
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// must have been the only item
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mTop = &mSentinel;
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}
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item->mAbove = nsnull;
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return item;
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}
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void nsDisplayList::DeleteBottom() {
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nsDisplayItem* item = RemoveBottom();
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if (item) {
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item->nsDisplayItem::~nsDisplayItem();
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}
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}
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void nsDisplayList::DeleteAll() {
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nsDisplayItem* item;
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while ((item = RemoveBottom()) != nsnull) {
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item->nsDisplayItem::~nsDisplayItem();
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}
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}
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nsIFrame* nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt) const {
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nsVoidArray elements;
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nsDisplayItem* item;
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for (item = GetBottom(); item; item = item->GetAbove()) {
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elements.AppendElement(item);
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}
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for (PRInt32 i = elements.Count() - 1; i >= 0; --i) {
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item = NS_STATIC_CAST(nsDisplayItem*, elements.ElementAt(i));
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if (item->GetBounds(aBuilder).Contains(aPt)) {
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nsIFrame* f = item->HitTest(aBuilder, aPt);
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// Handle the XUL 'mousethrough' feature.
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if (f) {
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PRBool mouseThrough = PR_FALSE;
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f->GetMouseThrough(mouseThrough);
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if (!mouseThrough)
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return f;
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}
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}
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}
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return nsnull;
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}
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typedef PRBool (* SortLEQ)(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
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void* aClosure);
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static void Sort(nsDisplayList* aList, PRInt32 aCount, SortLEQ aCmp, void* aClosure) {
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if (aCount < 2)
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return;
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nsDisplayList list1;
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nsDisplayList list2;
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int i;
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PRInt32 half = aCount/2;
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PRBool sorted = PR_TRUE;
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nsDisplayItem* prev = nsnull;
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for (i = 0; i < aCount; ++i) {
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nsDisplayItem* item = aList->RemoveBottom();
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(i < half ? &list1 : &list2)->AppendToTop(item);
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if (sorted && prev && !aCmp(prev, item, aClosure)) {
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sorted = PR_FALSE;
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}
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prev = item;
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}
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if (sorted) {
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aList->AppendToTop(&list1);
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aList->AppendToTop(&list2);
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return;
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}
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Sort(&list1, half, aCmp, aClosure);
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Sort(&list2, aCount - half, aCmp, aClosure);
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for (i = 0; i < aCount; ++i) {
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if (list1.GetBottom() &&
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(!list2.GetBottom() ||
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aCmp(list1.GetBottom(), list2.GetBottom(), aClosure))) {
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aList->AppendToTop(list1.RemoveBottom());
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} else {
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aList->AppendToTop(list2.RemoveBottom());
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}
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}
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}
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static PRBool IsContentLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
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void* aClosure) {
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// These GetUnderlyingFrame calls return non-null because we're only used
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// in sorting
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return nsLayoutUtils::CompareTreePosition(
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aItem1->GetUnderlyingFrame()->GetContent(),
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aItem2->GetUnderlyingFrame()->GetContent(),
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NS_STATIC_CAST(nsIContent*, aClosure)) <= 0;
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}
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static PRBool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
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void* aClosure) {
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// These GetUnderlyingFrame calls return non-null because we're only used
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// in sorting
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PRInt32 diff = nsLayoutUtils::GetZIndex(aItem1->GetUnderlyingFrame()) -
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nsLayoutUtils::GetZIndex(aItem2->GetUnderlyingFrame());
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if (diff == 0)
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return IsContentLEQ(aItem1, aItem2, aClosure);
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return diff < 0;
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}
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void nsDisplayList::ExplodeAnonymousChildLists(nsDisplayListBuilder* aBuilder) {
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// See if there's anything to do
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PRBool anyAnonymousItems = PR_FALSE;
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nsDisplayItem* i;
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for (i = GetBottom(); i != nsnull; i = i->GetAbove()) {
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if (!i->GetUnderlyingFrame()) {
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anyAnonymousItems = PR_TRUE;
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break;
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}
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}
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if (!anyAnonymousItems)
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return;
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nsDisplayList tmp;
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while ((i = RemoveBottom()) != nsnull) {
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if (i->GetUnderlyingFrame()) {
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tmp.AppendToTop(i);
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} else {
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nsDisplayList* list = i->GetList();
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NS_ASSERTION(list, "leaf items can't be anonymous");
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list->ExplodeAnonymousChildLists(aBuilder);
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nsDisplayItem* j;
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while ((j = list->RemoveBottom()) != nsnull) {
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tmp.AppendToTop(NS_STATIC_CAST(nsDisplayWrapList*, i)->
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WrapWithClone(aBuilder, j));
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}
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i->nsDisplayItem::~nsDisplayItem();
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}
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}
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AppendToTop(&tmp);
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}
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void nsDisplayList::SortByZOrder(nsDisplayListBuilder* aBuilder,
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nsIContent* aCommonAncestor) {
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ExplodeAnonymousChildLists(aBuilder);
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Sort(this, Count(), IsZOrderLEQ, aCommonAncestor);
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}
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void nsDisplayList::SortByContentOrder(nsDisplayListBuilder* aBuilder,
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nsIContent* aCommonAncestor) {
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ExplodeAnonymousChildLists(aBuilder);
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Sort(this, Count(), IsContentLEQ, aCommonAncestor);
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}
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static PRBool
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NonZeroStyleCoord(const nsStyleCoord& aCoord) {
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switch (aCoord.GetUnit()) {
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case eStyleUnit_Percent:
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return aCoord.GetPercentValue() > 0;
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case eStyleUnit_Coord:
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return aCoord.GetCoordValue() > 0;
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case eStyleUnit_Null:
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return PR_FALSE;
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default:
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return PR_TRUE;
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}
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}
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static PRBool
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HasNonZeroBorderRadius(const nsStyleBorder* aBorder) {
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nsStyleCoord coord;
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aBorder->mBorderRadius.GetTop(coord);
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if (NonZeroStyleCoord(coord)) return PR_TRUE;
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aBorder->mBorderRadius.GetRight(coord);
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if (NonZeroStyleCoord(coord)) return PR_TRUE;
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aBorder->mBorderRadius.GetBottom(coord);
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if (NonZeroStyleCoord(coord)) return PR_TRUE;
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aBorder->mBorderRadius.GetLeft(coord);
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if (NonZeroStyleCoord(coord)) return PR_TRUE;
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return PR_FALSE;
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}
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PRBool
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nsDisplayBackground::IsOpaque(nsDisplayListBuilder* aBuilder) {
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// theme background overrides any other background
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if (mFrame->IsThemed())
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return PR_FALSE;
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PRBool isCanvas;
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const nsStyleBackground* bg;
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PRBool hasBG =
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nsCSSRendering::FindBackground(mFrame->GetPresContext(), mFrame, &bg, &isCanvas);
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if (!hasBG || (bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) ||
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bg->mBackgroundClip != NS_STYLE_BG_CLIP_BORDER ||
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HasNonZeroBorderRadius(mFrame->GetStyleBorder()) ||
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NS_GET_A(bg->mBackgroundColor) < 255)
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return PR_FALSE;
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return PR_TRUE;
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}
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PRBool
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nsDisplayBackground::IsUniform(nsDisplayListBuilder* aBuilder) {
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// theme background overrides any other background
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if (mFrame->IsThemed())
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return PR_FALSE;
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PRBool isCanvas;
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const nsStyleBackground* bg;
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PRBool hasBG =
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nsCSSRendering::FindBackground(mFrame->GetPresContext(), mFrame, &bg, &isCanvas);
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if (!hasBG)
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return PR_TRUE;
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if ((bg->mBackgroundFlags & NS_STYLE_BG_IMAGE_NONE) &&
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!HasNonZeroBorderRadius(mFrame->GetStyleBorder()) &&
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bg->mBackgroundClip == NS_STYLE_BG_CLIP_BORDER)
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return PR_TRUE;
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return PR_FALSE;
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}
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PRBool
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nsDisplayBackground::IsVaryingRelativeToFrame(nsDisplayListBuilder* aBuilder,
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nsIFrame* aAncestorFrame)
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{
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PRBool isCanvas;
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const nsStyleBackground* bg;
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PRBool hasBG =
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nsCSSRendering::FindBackground(mFrame->GetPresContext(), mFrame, &bg, &isCanvas);
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if (!hasBG)
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return PR_FALSE;
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if (!bg->HasFixedBackground())
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return PR_FALSE;
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// aAncestorFrame is an ancestor of this frame ... if it's in our document
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// then we'll be moving relative to the viewport, so we will change our
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// display. If it's in some ancestor document then we won't be moving
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// relative to the viewport so we won't change our display.
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for (nsIFrame* f = mFrame->GetParent(); f; f = f->GetParent()) {
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if (f == aAncestorFrame)
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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void
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|
nsDisplayBackground::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
|
||
|
nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
|
||
|
nsCSSRendering::PaintBackground(mFrame->GetPresContext(), *aCtx, mFrame,
|
||
|
aDirtyRect, nsRect(offset, mFrame->GetSize()),
|
||
|
*mFrame->GetStyleBorder(),
|
||
|
*mFrame->GetStylePadding(),
|
||
|
mFrame->HonorPrintBackgroundSettings());
|
||
|
}
|
||
|
|
||
|
nsRect
|
||
|
nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder) {
|
||
|
return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
nsDisplayOutline::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
|
||
|
// TODO join outlines together
|
||
|
nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
|
||
|
nsCSSRendering::PaintOutline(mFrame->GetPresContext(), *aCtx, mFrame,
|
||
|
aDirtyRect, nsRect(offset, mFrame->GetSize()),
|
||
|
*mFrame->GetStyleBorder(),
|
||
|
*mFrame->GetStyleOutline(),
|
||
|
mFrame->GetStyleContext(), 0);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
|
||
|
nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
|
||
|
nsCSSRendering::PaintBorder(mFrame->GetPresContext(), *aCtx, mFrame,
|
||
|
aDirtyRect, nsRect(offset, mFrame->GetSize()),
|
||
|
*mFrame->GetStyleBorder(),
|
||
|
mFrame->GetStyleContext(), mFrame->GetSkipSides());
|
||
|
}
|
||
|
|
||
|
nsDisplayWrapList::nsDisplayWrapList(nsIFrame* aFrame, nsDisplayList* aList)
|
||
|
: mFrame(aFrame) {
|
||
|
mList.AppendToTop(aList);
|
||
|
}
|
||
|
|
||
|
nsDisplayWrapList::nsDisplayWrapList(nsIFrame* aFrame, nsDisplayItem* aItem)
|
||
|
: mFrame(aFrame) {
|
||
|
mList.AppendToTop(aItem);
|
||
|
}
|
||
|
|
||
|
nsDisplayWrapList::~nsDisplayWrapList() {
|
||
|
mList.DeleteAll();
|
||
|
}
|
||
|
|
||
|
nsIFrame*
|
||
|
nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt) {
|
||
|
return mList.HitTest(aBuilder, aPt);
|
||
|
}
|
||
|
|
||
|
nsRect
|
||
|
nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder) {
|
||
|
nsRect bounds;
|
||
|
for (nsDisplayItem* i = mList.GetBottom(); i != nsnull; i = i->GetAbove()) {
|
||
|
bounds.UnionRect(bounds, i->GetBounds(aBuilder));
|
||
|
}
|
||
|
return bounds;
|
||
|
}
|
||
|
|
||
|
PRBool
|
||
|
nsDisplayWrapList::OptimizeVisibility(nsDisplayListBuilder* aBuilder,
|
||
|
nsRegion* aVisibleRegion) {
|
||
|
mList.OptimizeVisibility(aBuilder, aVisibleRegion);
|
||
|
// If none of the items are visible, they will all have been deleted
|
||
|
return mList.GetTop() != nsnull;
|
||
|
}
|
||
|
|
||
|
PRBool
|
||
|
nsDisplayWrapList::IsOpaque(nsDisplayListBuilder* aBuilder) {
|
||
|
// We could try to do something but let's conservatively just return PR_FALSE.
|
||
|
// We reimplement OptimizeVisibility and that's what really matters
|
||
|
return PR_FALSE;
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayWrapList::IsUniform(nsDisplayListBuilder* aBuilder) {
|
||
|
// We could try to do something but let's conservatively just return PR_FALSE.
|
||
|
return PR_FALSE;
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayWrapList::IsVaryingRelativeToFrame(nsDisplayListBuilder* aBuilder,
|
||
|
nsIFrame* aFrame) {
|
||
|
for (nsDisplayItem* i = mList.GetBottom(); i != nsnull; i = i->GetAbove()) {
|
||
|
if (i->IsVaryingRelativeToFrame(aBuilder, aFrame))
|
||
|
return PR_TRUE;
|
||
|
}
|
||
|
return PR_FALSE;
|
||
|
}
|
||
|
|
||
|
void nsDisplayWrapList::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
|
||
|
mList.Paint(aBuilder, aCtx, aDirtyRect);
|
||
|
}
|
||
|
|
||
|
static nsresult
|
||
|
WrapDisplayList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
||
|
nsDisplayList* aList, nsDisplayWrapper* aWrapper) {
|
||
|
if (!aList->GetTop())
|
||
|
return NS_OK;
|
||
|
nsDisplayItem* item = aWrapper->WrapList(aBuilder, aFrame, aList);
|
||
|
if (!item)
|
||
|
return NS_ERROR_OUT_OF_MEMORY;
|
||
|
// aList was emptied
|
||
|
aList->AppendToTop(item);
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
static nsresult
|
||
|
WrapEachDisplayItem(nsDisplayListBuilder* aBuilder,
|
||
|
nsDisplayList* aList, nsDisplayWrapper* aWrapper) {
|
||
|
nsDisplayList newList;
|
||
|
nsDisplayItem* item;
|
||
|
while ((item = aList->RemoveBottom())) {
|
||
|
item = aWrapper->WrapItem(aBuilder, item);
|
||
|
if (!item)
|
||
|
return NS_ERROR_OUT_OF_MEMORY;
|
||
|
newList.AppendToTop(item);
|
||
|
}
|
||
|
// aList was emptied
|
||
|
aList->AppendToTop(&newList);
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
nsresult nsDisplayWrapper::WrapLists(nsDisplayListBuilder* aBuilder,
|
||
|
nsIFrame* aFrame, const nsDisplayListSet& aIn, const nsDisplayListSet& aOut)
|
||
|
{
|
||
|
nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
|
||
|
if (&aOut == &aIn)
|
||
|
return NS_OK;
|
||
|
aOut.BorderBackground()->AppendToTop(aIn.BorderBackground());
|
||
|
aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds());
|
||
|
aOut.Floats()->AppendToTop(aIn.Floats());
|
||
|
aOut.Content()->AppendToTop(aIn.Content());
|
||
|
aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants());
|
||
|
aOut.Outlines()->AppendToTop(aIn.Outlines());
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
nsresult nsDisplayWrapper::WrapListsInPlace(nsDisplayListBuilder* aBuilder,
|
||
|
nsIFrame* aFrame, const nsDisplayListSet& aLists)
|
||
|
{
|
||
|
nsresult rv;
|
||
|
if (WrapBorderBackground()) {
|
||
|
// Our border-backgrounds are in-flow
|
||
|
rv = WrapDisplayList(aBuilder, aFrame, aLists.BorderBackground(), this);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
}
|
||
|
// Our block border-backgrounds are in-flow
|
||
|
rv = WrapDisplayList(aBuilder, aFrame, aLists.BlockBorderBackgrounds(), this);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
// The floats are not in flow
|
||
|
rv = WrapEachDisplayItem(aBuilder, aLists.Floats(), this);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
// Our child content is in flow
|
||
|
rv = WrapDisplayList(aBuilder, aFrame, aLists.Content(), this);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
// The positioned descendants may not be in-flow
|
||
|
rv = WrapEachDisplayItem(aBuilder, aLists.PositionedDescendants(), this);
|
||
|
NS_ENSURE_SUCCESS(rv, rv);
|
||
|
// The outlines may not be in-flow
|
||
|
return WrapEachDisplayItem(aBuilder, aLists.Outlines(), this);
|
||
|
}
|
||
|
|
||
|
nsDisplayOpacity::nsDisplayOpacity(nsIFrame* aFrame, nsDisplayList* aList)
|
||
|
: nsDisplayWrapList(aFrame, aList), mNeedAlpha(PR_TRUE) {
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayOpacity::IsOpaque(nsDisplayListBuilder* aBuilder) {
|
||
|
// We are never opaque, if our opacity was < 1 then we wouldn't have
|
||
|
// been created.
|
||
|
return PR_FALSE;
|
||
|
}
|
||
|
|
||
|
void nsDisplayOpacity::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
|
||
|
{
|
||
|
// XXX This way of handling 'opacity' creates exponential time blowup in the
|
||
|
// depth of nested translucent elements. This will be fixed when we move to
|
||
|
// cairo with support for real alpha channels in surfaces, so we don't have
|
||
|
// to do this white/black hack anymore.
|
||
|
nsIViewManager* vm = mFrame->GetPresContext()->GetViewManager();
|
||
|
nsRect bounds;
|
||
|
bounds.IntersectRect(GetBounds(aBuilder), aDirtyRect);
|
||
|
nsIViewManager::BlendingBuffers* buffers =
|
||
|
vm->CreateBlendingBuffers(aCtx, PR_FALSE, nsnull, mNeedAlpha, bounds);
|
||
|
if (!buffers) {
|
||
|
NS_WARNING("Could not create blending buffers for translucent painting; ignoring opacity");
|
||
|
nsDisplayWrapList::Paint(aBuilder, aCtx, aDirtyRect);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// Paint onto black, and also onto white if necessary
|
||
|
nsDisplayWrapList::Paint(aBuilder, buffers->mBlackCX, bounds);
|
||
|
if (buffers->mWhiteCX) {
|
||
|
nsDisplayWrapList::Paint(aBuilder, buffers->mWhiteCX, bounds);
|
||
|
}
|
||
|
|
||
|
nsTransform2D* transform;
|
||
|
nsresult rv = aCtx->GetCurrentTransform(transform);
|
||
|
if (NS_FAILED(rv))
|
||
|
return;
|
||
|
|
||
|
nsRect damageRectInPixels = bounds;
|
||
|
transform->TransformCoord(&damageRectInPixels.x, &damageRectInPixels.y,
|
||
|
&damageRectInPixels.width, &damageRectInPixels.height);
|
||
|
// If blender creation failed then we would have not received a buffers object
|
||
|
nsIBlender* blender = vm->GetBlender();
|
||
|
blender->Blend(0, 0, damageRectInPixels.width, damageRectInPixels.height,
|
||
|
buffers->mBlackCX, aCtx,
|
||
|
damageRectInPixels.x, damageRectInPixels.y,
|
||
|
mFrame->GetStyleDisplay()->mOpacity, buffers->mWhiteCX,
|
||
|
NS_RGB(0, 0, 0), NS_RGB(255, 255, 255));
|
||
|
delete buffers;
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayOpacity::OptimizeVisibility(nsDisplayListBuilder* aBuilder,
|
||
|
nsRegion* aVisibleRegion) {
|
||
|
// Our children are translucent so we should not allow them to subtract
|
||
|
// area from aVisibleRegion. We do need to find out what is visible under
|
||
|
// our children in the temporary compositing buffer, because if our children
|
||
|
// paint our entire bounds opaquely then we don't need an alpha channel in
|
||
|
// the temporary compositing buffer.
|
||
|
nsRegion visibleUnderChildren = *aVisibleRegion;
|
||
|
PRBool anyVisibleChildren =
|
||
|
nsDisplayWrapList::OptimizeVisibility(aBuilder, &visibleUnderChildren);
|
||
|
if (!anyVisibleChildren)
|
||
|
return PR_FALSE;
|
||
|
|
||
|
mNeedAlpha = visibleUnderChildren.Intersects(GetBounds(aBuilder));
|
||
|
return PR_TRUE;
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayOpacity::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
|
||
|
if (aItem->GetType() != TYPE_OPACITY)
|
||
|
return PR_FALSE;
|
||
|
// items for the same content element should be merged into a single
|
||
|
// compositing group
|
||
|
// aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity
|
||
|
if (aItem->GetUnderlyingFrame()->GetContent() != mFrame->GetContent())
|
||
|
return PR_FALSE;
|
||
|
mList.AppendToBottom(&NS_STATIC_CAST(nsDisplayOpacity*, aItem)->mList);
|
||
|
return PR_TRUE;
|
||
|
}
|
||
|
|
||
|
nsDisplayClip::nsDisplayClip(nsIFrame* aFrame, nsDisplayItem* aItem,
|
||
|
const nsRect& aRect)
|
||
|
: nsDisplayWrapList(aFrame, aItem), mClip(aRect) {
|
||
|
}
|
||
|
|
||
|
nsDisplayClip::nsDisplayClip(nsIFrame* aFrame, nsDisplayList* aList,
|
||
|
const nsRect& aRect)
|
||
|
: nsDisplayWrapList(aFrame, aList), mClip(aRect) {
|
||
|
}
|
||
|
|
||
|
nsRect nsDisplayClip::GetBounds(nsDisplayListBuilder* aBuilder) {
|
||
|
nsRect r = nsDisplayWrapList::GetBounds(aBuilder);
|
||
|
r.IntersectRect(mClip, r);
|
||
|
return r;
|
||
|
}
|
||
|
|
||
|
void nsDisplayClip::Paint(nsDisplayListBuilder* aBuilder,
|
||
|
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
|
||
|
nsRect dirty;
|
||
|
dirty.IntersectRect(mClip, aDirtyRect);
|
||
|
aCtx->PushState();
|
||
|
aCtx->SetClipRect(dirty, nsClipCombine_kIntersect);
|
||
|
nsDisplayWrapList::Paint(aBuilder, aCtx, dirty);
|
||
|
aCtx->PopState();
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayClip::OptimizeVisibility(nsDisplayListBuilder* aBuilder,
|
||
|
nsRegion* aVisibleRegion) {
|
||
|
nsRegion clipped;
|
||
|
clipped.And(*aVisibleRegion, mClip);
|
||
|
nsRegion rNew(clipped);
|
||
|
PRBool anyVisible = nsDisplayWrapList::OptimizeVisibility(aBuilder, &rNew);
|
||
|
nsRegion subtracted;
|
||
|
subtracted.Sub(clipped, rNew);
|
||
|
aVisibleRegion->SimpleSubtract(subtracted);
|
||
|
return anyVisible;
|
||
|
}
|
||
|
|
||
|
PRBool nsDisplayClip::TryMerge(nsDisplayListBuilder* aBuilder,
|
||
|
nsDisplayItem* aItem) {
|
||
|
if (aItem->GetType() != TYPE_CLIP)
|
||
|
return PR_FALSE;
|
||
|
nsDisplayClip* other = NS_STATIC_CAST(nsDisplayClip*, aItem);
|
||
|
if (other->mClip != mClip)
|
||
|
return PR_FALSE;
|
||
|
mList.AppendToBottom(&other->mList);
|
||
|
return PR_TRUE;
|
||
|
}
|
||
|
|
||
|
nsDisplayWrapList* nsDisplayClip::WrapWithClone(nsDisplayListBuilder* aBuilder,
|
||
|
nsDisplayItem* aItem) {
|
||
|
return new (aBuilder) nsDisplayClip(aItem->GetUnderlyingFrame(), aItem, mClip);
|
||
|
}
|