/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=2 sw=2 et tw=78: * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Novell code. * * The Initial Developer of the Original Code is Novell Corporation. * Portions created by the Initial Developer are Copyright (C) 2006 * the Initial Developer. All Rights Reserved. * * Contributor(s): * robert@ocallahan.org * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /* * structures that represent things to be painted (ordered in z-order), * used during painting and hit testing */ #include "nsDisplayList.h" #include "nsCSSRendering.h" #include "nsISelectionController.h" #include "nsIPresShell.h" #include "nsRegion.h" #include "nsFrameManager.h" #include "gfxContext.h" #include "nsStyleStructInlines.h" #include "nsStyleTransformMatrix.h" #include "gfxMatrix.h" #ifdef MOZ_SVG #include "nsSVGIntegrationUtils.h" #endif nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame, PRBool aIsForEvents, PRBool aBuildCaret) : mReferenceFrame(aReferenceFrame), mMovingFrame(nsnull), mIgnoreScrollFrame(nsnull), mCurrentTableItem(nsnull), mBuildCaret(aBuildCaret), mEventDelivery(aIsForEvents), mIsAtRootOfPseudoStackingContext(PR_FALSE), mPaintAllFrames(PR_FALSE) { PL_InitArenaPool(&mPool, "displayListArena", 1024, sizeof(void*)-1); nsPresContext* pc = aReferenceFrame->PresContext(); nsIPresShell *shell = pc->PresShell(); PRBool suppressed; shell->IsPaintingSuppressed(&suppressed); mIsBackgroundOnly = suppressed; if (pc->IsRenderingOnlySelection()) { nsCOMPtr selcon(do_QueryInterface(shell)); if (selcon) { selcon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(mBoundingSelection)); } } if (mIsBackgroundOnly) { mBuildCaret = PR_FALSE; } } // Destructor function for the dirty rect property static void DestroyRectFunc(void* aFrame, nsIAtom* aPropertyName, void* aPropertyValue, void* aDtorData) { delete static_cast(aPropertyValue); } static void MarkFrameForDisplay(nsIFrame* aFrame, nsIFrame* aStopAtFrame) { nsFrameManager* frameManager = aFrame->PresContext()->PresShell()->FrameManager(); for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetParentOrPlaceholderFor(frameManager, f)) { if (f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) return; f->AddStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO); if (f == aStopAtFrame) { // we've reached a frame that we know will be painted, so we can stop. break; } } } static void MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame, nsIFrame* aFrame, const nsRect& aDirtyRect) { nsRect dirty = aDirtyRect - aFrame->GetOffsetTo(aDirtyFrame); nsRect overflowRect = aFrame->GetOverflowRect(); if (!dirty.IntersectRect(dirty, overflowRect)) return; // if "new nsRect" fails, this won't do anything, but that's okay aFrame->SetProperty(nsGkAtoms::outOfFlowDirtyRectProperty, new nsRect(dirty), DestroyRectFunc); MarkFrameForDisplay(aFrame, aDirtyFrame); } static void UnmarkFrameForDisplay(nsIFrame* aFrame) { aFrame->DeleteProperty(nsGkAtoms::outOfFlowDirtyRectProperty); nsFrameManager* frameManager = aFrame->PresContext()->PresShell()->FrameManager(); for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetParentOrPlaceholderFor(frameManager, f)) { if (!(f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) return; f->RemoveStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO); } } nsDisplayListBuilder::~nsDisplayListBuilder() { NS_ASSERTION(mFramesMarkedForDisplay.Length() == 0, "All frames should have been unmarked"); NS_ASSERTION(mPresShellStates.Length() == 0, "All presshells should have been exited"); NS_ASSERTION(!mCurrentTableItem, "No table item should be active"); PL_FreeArenaPool(&mPool); PL_FinishArenaPool(&mPool); } nsCaret * nsDisplayListBuilder::GetCaret() { nsRefPtr caret; CurrentPresShellState()->mPresShell->GetCaret(getter_AddRefs(caret)); return caret; } void nsDisplayListBuilder::EnterPresShell(nsIFrame* aReferenceFrame, const nsRect& aDirtyRect) { PresShellState* state = mPresShellStates.AppendElement(); if (!state) return; state->mPresShell = aReferenceFrame->PresContext()->PresShell(); state->mCaretFrame = nsnull; state->mFirstFrameMarkedForDisplay = mFramesMarkedForDisplay.Length(); if (!mBuildCaret) return; nsRefPtr caret; state->mPresShell->GetCaret(getter_AddRefs(caret)); state->mCaretFrame = caret->GetCaretFrame(); if (state->mCaretFrame) { // Check if the dirty rect intersects with the caret's dirty rect. nsRect caretRect = caret->GetCaretRect() + state->mCaretFrame->GetOffsetTo(aReferenceFrame); if (caretRect.Intersects(aDirtyRect)) { // Okay, our rects intersect, let's mark the frame and all of its ancestors. mFramesMarkedForDisplay.AppendElement(state->mCaretFrame); MarkFrameForDisplay(state->mCaretFrame, nsnull); } } } void nsDisplayListBuilder::LeavePresShell(nsIFrame* aReferenceFrame, const nsRect& aDirtyRect) { if (CurrentPresShellState()->mPresShell != aReferenceFrame->PresContext()->PresShell()) { // Must have not allocated a state for this presshell, presumably due // to OOM. return; } // Unmark and pop off the frames marked for display in this pres shell. PRUint32 firstFrameForShell = CurrentPresShellState()->mFirstFrameMarkedForDisplay; for (PRUint32 i = firstFrameForShell; i < mFramesMarkedForDisplay.Length(); ++i) { UnmarkFrameForDisplay(mFramesMarkedForDisplay[i]); } mFramesMarkedForDisplay.SetLength(firstFrameForShell); mPresShellStates.SetLength(mPresShellStates.Length() - 1); } void nsDisplayListBuilder::MarkFramesForDisplayList(nsIFrame* aDirtyFrame, nsIFrame* aFrames, const nsRect& aDirtyRect) { while (aFrames) { mFramesMarkedForDisplay.AppendElement(aFrames); MarkOutOfFlowFrameForDisplay(aDirtyFrame, aFrames, aDirtyRect); aFrames = aFrames->GetNextSibling(); } } void* nsDisplayListBuilder::Allocate(size_t aSize) { void *tmp; PL_ARENA_ALLOCATE(tmp, &mPool, aSize); return tmp; } void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const { aDestination.BorderBackground()->AppendToTop(BorderBackground()); aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds()); aDestination.Floats()->AppendToTop(Floats()); aDestination.Content()->AppendToTop(Content()); aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants()); aDestination.Outlines()->AppendToTop(Outlines()); } // Suitable for leaf items only, overridden by nsDisplayWrapList PRBool nsDisplayItem::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { nsRect bounds = GetBounds(aBuilder); if (!aVisibleRegion->Intersects(bounds)) return PR_FALSE; nsIFrame* f = GetUnderlyingFrame(); NS_ASSERTION(f, "GetUnderlyingFrame() must return non-null for leaf items"); PRBool isMoving = aBuilder->IsMovingFrame(f); if (IsOpaque(aBuilder)) { nsRect opaqueArea = bounds; if (isMoving) { // The display list should include items for both the before and after // states (see nsLayoutUtils::ComputeRepaintRegionForCopy. So the // only area we want to cover is the the area that was opaque in the // before state and in the after state. opaqueArea.IntersectRect(bounds - aBuilder->GetMoveDelta(), bounds); } aVisibleRegion->SimpleSubtract(opaqueArea); } return PR_TRUE; } void nsDisplayList::FlattenTo(nsTArray* aElements) { nsDisplayItem* item; while ((item = RemoveBottom()) != nsnull) { if (item->GetType() == nsDisplayItem::TYPE_WRAPLIST) { item->GetList()->FlattenTo(aElements); item->~nsDisplayItem(); } else { aElements->AppendElement(item); } } } nsRect nsDisplayList::GetBounds(nsDisplayListBuilder* aBuilder) const { nsRect bounds; for (nsDisplayItem* i = GetBottom(); i != nsnull; i = i->GetAbove()) { bounds.UnionRect(bounds, i->GetBounds(aBuilder)); } return bounds; } void nsDisplayList::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { nsAutoTArray elements; FlattenTo(&elements); for (PRInt32 i = elements.Length() - 1; i >= 0; --i) { nsDisplayItem* item = elements[i]; nsDisplayItem* belowItem = i < 1 ? nsnull : elements[i - 1]; if (belowItem && item->TryMerge(aBuilder, belowItem)) { belowItem->~nsDisplayItem(); elements.ReplaceElementsAt(i - 1, 1, item); continue; } if (item->OptimizeVisibility(aBuilder, aVisibleRegion)) { AppendToBottom(item); } else { item->~nsDisplayItem(); } } } void nsDisplayList::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) const { for (nsDisplayItem* i = GetBottom(); i != nsnull; i = i->GetAbove()) { i->Paint(aBuilder, aCtx, aDirtyRect); } nsCSSRendering::DidPaint(); } PRUint32 nsDisplayList::Count() const { PRUint32 count = 0; for (nsDisplayItem* i = GetBottom(); i; i = i->GetAbove()) { ++count; } return count; } nsDisplayItem* nsDisplayList::RemoveBottom() { nsDisplayItem* item = mSentinel.mAbove; if (!item) return nsnull; mSentinel.mAbove = item->mAbove; if (item == mTop) { // must have been the only item mTop = &mSentinel; } item->mAbove = nsnull; return item; } void nsDisplayList::DeleteBottom() { nsDisplayItem* item = RemoveBottom(); if (item) { item->~nsDisplayItem(); } } void nsDisplayList::DeleteAll() { nsDisplayItem* item; while ((item = RemoveBottom()) != nsnull) { item->~nsDisplayItem(); } } nsIFrame* nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt, nsDisplayItem::HitTestState* aState) const { PRInt32 itemBufferStart = aState->mItemBuffer.Length(); nsDisplayItem* item; for (item = GetBottom(); item; item = item->GetAbove()) { aState->mItemBuffer.AppendElement(item); } for (PRInt32 i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart; --i) { // Pop element off the end of the buffer. We want to shorten the buffer // so that recursive calls to HitTest have more buffer space. item = aState->mItemBuffer[i]; aState->mItemBuffer.SetLength(i); if (item->GetBounds(aBuilder).Contains(aPt)) { nsIFrame* f = item->HitTest(aBuilder, aPt, aState); // Handle the XUL 'mousethrough' feature. if (f) { if (!f->GetMouseThrough()) { aState->mItemBuffer.SetLength(itemBufferStart); return f; } } } } NS_ASSERTION(aState->mItemBuffer.Length() == PRUint32(itemBufferStart), "How did we forget to pop some elements?"); return nsnull; } static void Sort(nsDisplayList* aList, PRInt32 aCount, nsDisplayList::SortLEQ aCmp, void* aClosure) { if (aCount < 2) return; nsDisplayList list1; nsDisplayList list2; int i; PRInt32 half = aCount/2; PRBool sorted = PR_TRUE; nsDisplayItem* prev = nsnull; for (i = 0; i < aCount; ++i) { nsDisplayItem* item = aList->RemoveBottom(); (i < half ? &list1 : &list2)->AppendToTop(item); if (sorted && prev && !aCmp(prev, item, aClosure)) { sorted = PR_FALSE; } prev = item; } if (sorted) { aList->AppendToTop(&list1); aList->AppendToTop(&list2); return; } Sort(&list1, half, aCmp, aClosure); Sort(&list2, aCount - half, aCmp, aClosure); for (i = 0; i < aCount; ++i) { if (list1.GetBottom() && (!list2.GetBottom() || aCmp(list1.GetBottom(), list2.GetBottom(), aClosure))) { aList->AppendToTop(list1.RemoveBottom()); } else { aList->AppendToTop(list2.RemoveBottom()); } } } static PRBool IsContentLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2, void* aClosure) { // These GetUnderlyingFrame calls return non-null because we're only used // in sorting return nsLayoutUtils::CompareTreePosition( aItem1->GetUnderlyingFrame()->GetContent(), aItem2->GetUnderlyingFrame()->GetContent(), static_cast(aClosure)) <= 0; } static PRBool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2, void* aClosure) { // These GetUnderlyingFrame calls return non-null because we're only used // in sorting PRInt32 diff = nsLayoutUtils::GetZIndex(aItem1->GetUnderlyingFrame()) - nsLayoutUtils::GetZIndex(aItem2->GetUnderlyingFrame()); if (diff == 0) return IsContentLEQ(aItem1, aItem2, aClosure); return diff < 0; } void nsDisplayList::ExplodeAnonymousChildLists(nsDisplayListBuilder* aBuilder) { // See if there's anything to do PRBool anyAnonymousItems = PR_FALSE; nsDisplayItem* i; for (i = GetBottom(); i != nsnull; i = i->GetAbove()) { if (!i->GetUnderlyingFrame()) { anyAnonymousItems = PR_TRUE; break; } } if (!anyAnonymousItems) return; nsDisplayList tmp; while ((i = RemoveBottom()) != nsnull) { if (i->GetUnderlyingFrame()) { tmp.AppendToTop(i); } else { nsDisplayList* list = i->GetList(); NS_ASSERTION(list, "leaf items can't be anonymous"); list->ExplodeAnonymousChildLists(aBuilder); nsDisplayItem* j; while ((j = list->RemoveBottom()) != nsnull) { tmp.AppendToTop(static_cast(i)-> WrapWithClone(aBuilder, j)); } i->~nsDisplayItem(); } } AppendToTop(&tmp); } void nsDisplayList::SortByZOrder(nsDisplayListBuilder* aBuilder, nsIContent* aCommonAncestor) { Sort(aBuilder, IsZOrderLEQ, aCommonAncestor); } void nsDisplayList::SortByContentOrder(nsDisplayListBuilder* aBuilder, nsIContent* aCommonAncestor) { Sort(aBuilder, IsContentLEQ, aCommonAncestor); } void nsDisplayList::Sort(nsDisplayListBuilder* aBuilder, SortLEQ aCmp, void* aClosure) { ExplodeAnonymousChildLists(aBuilder); ::Sort(this, Count(), aCmp, aClosure); } PRBool nsDisplayBackground::IsOpaque(nsDisplayListBuilder* aBuilder) { // theme background overrides any other background if (mIsThemed) return PR_FALSE; const nsStyleBackground* bg; PRBool hasBG = nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bg); return (hasBG && NS_GET_A(bg->mBackgroundColor) == 255 && // bottom layer's clip is used for the color bg->BottomLayer().mClip == NS_STYLE_BG_CLIP_BORDER && !nsLayoutUtils::HasNonZeroCorner(mFrame->GetStyleBorder()-> mBorderRadius)); } PRBool nsDisplayBackground::IsUniform(nsDisplayListBuilder* aBuilder) { // theme background overrides any other background if (mIsThemed) return PR_FALSE; const nsStyleBackground* bg; PRBool hasBG = nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bg); if (!hasBG) return PR_TRUE; if (!bg->BottomLayer().mImage.mRequest && bg->mImageCount == 1 && !nsLayoutUtils::HasNonZeroCorner(mFrame->GetStyleBorder()->mBorderRadius) && bg->BottomLayer().mClip == NS_STYLE_BG_CLIP_BORDER) return PR_TRUE; return PR_FALSE; } PRBool nsDisplayBackground::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder) { NS_ASSERTION(aBuilder->IsMovingFrame(mFrame), "IsVaryingRelativeToMovingFrame called on non-moving frame!"); nsPresContext* presContext = mFrame->PresContext(); const nsStyleBackground* bg; PRBool hasBG = nsCSSRendering::FindBackground(presContext, mFrame, &bg); if (!hasBG) return PR_FALSE; if (!bg->HasFixedBackground()) return PR_FALSE; nsIFrame* movingFrame = aBuilder->GetRootMovingFrame(); // movingFrame is the frame that is going to be moved. It must be equal // to mFrame or some ancestor of mFrame, see assertion above. // If mFrame is in the same document as movingFrame, then mFrame // will move relative to its viewport, which means this display item will // change when it is moved. If they are in different documents, we do not // want to return true because mFrame won't move relative to its viewport. return movingFrame->PresContext() == presContext; } void nsDisplayBackground::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { nsPoint offset = aBuilder->ToReferenceFrame(mFrame); nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame, aDirtyRect, nsRect(offset, mFrame->GetSize()), mFrame->HonorPrintBackgroundSettings()); } nsRect nsDisplayBackground::GetBounds(nsDisplayListBuilder* aBuilder) { if (mIsThemed) return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame); return nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize()); } 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->PresContext(), *aCtx, mFrame, aDirtyRect, nsRect(offset, mFrame->GetSize()), *mFrame->GetStyleBorder(), *mFrame->GetStyleOutline(), mFrame->GetStyleContext()); } PRBool nsDisplayOutline::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { if (!nsDisplayItem::OptimizeVisibility(aBuilder, aVisibleRegion)) return PR_FALSE; const nsStyleOutline* outline = mFrame->GetStyleOutline(); nsPoint origin = aBuilder->ToReferenceFrame(mFrame); if (nsRect(origin, mFrame->GetSize()).Contains(aVisibleRegion->GetBounds()) && !nsLayoutUtils::HasNonZeroCorner(outline->mOutlineRadius)) { if (outline->mOutlineOffset >= 0) { // the visible region is entirely inside the border-rect, and the outline // isn't rendered inside the border-rect, so the outline is not visible return PR_FALSE; } } return PR_TRUE; } void nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { // Note: Because we exist, we know that the caret is visible, so we don't // need to check for the caret's visibility. mCaret->PaintCaret(aBuilder, aCtx, mFrame, aBuilder->ToReferenceFrame(mFrame)); } PRBool nsDisplayBorder::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { if (!nsDisplayItem::OptimizeVisibility(aBuilder, aVisibleRegion)) return PR_FALSE; nsRect paddingRect = mFrame->GetPaddingRect() - mFrame->GetPosition() + aBuilder->ToReferenceFrame(mFrame); const nsStyleBorder *styleBorder; if (paddingRect.Contains(aVisibleRegion->GetBounds()) && !(styleBorder = mFrame->GetStyleBorder())->IsBorderImageLoaded() && !nsLayoutUtils::HasNonZeroCorner(styleBorder->mBorderRadius)) { // the visible region is entirely inside the content rect, and no part // of the border is rendered inside the content rect, so we are not // visible // Skip this if there's a border-image (which draws a background // too) or if there is a border-radius (which makes the border draw // further in). return PR_FALSE; } return PR_TRUE; } void nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { nsPoint offset = aBuilder->ToReferenceFrame(mFrame); nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame, aDirtyRect, nsRect(offset, mFrame->GetSize()), *mFrame->GetStyleBorder(), mFrame->GetStyleContext(), mFrame->GetSkipSides()); } void nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { nsPoint offset = aBuilder->ToReferenceFrame(mFrame); nsCSSRendering::PaintBoxShadowOuter(mFrame->PresContext(), *aCtx, mFrame, nsRect(offset, mFrame->GetSize()), aDirtyRect); } nsRect nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder) { return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame); } PRBool nsDisplayBoxShadowOuter::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { if (!nsDisplayItem::OptimizeVisibility(aBuilder, aVisibleRegion)) return PR_FALSE; const nsStyleBorder* border = mFrame->GetStyleBorder(); nsPoint origin = aBuilder->ToReferenceFrame(mFrame); if (nsRect(origin, mFrame->GetSize()).Contains(aVisibleRegion->GetBounds()) && !nsLayoutUtils::HasNonZeroCorner(border->mBorderRadius)) { // the visible region is entirely inside the border-rect, and box shadows // never render within the border-rect (unless there's a border radius). return PR_FALSE; } return PR_TRUE; } void nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { nsPoint offset = aBuilder->ToReferenceFrame(mFrame); nsCSSRendering::PaintBoxShadowInner(mFrame->PresContext(), *aCtx, mFrame, nsRect(offset, mFrame->GetSize()), aDirtyRect); } nsDisplayWrapList::nsDisplayWrapList(nsIFrame* aFrame, nsDisplayList* aList) : nsDisplayItem(aFrame) { mList.AppendToTop(aList); } nsDisplayWrapList::nsDisplayWrapList(nsIFrame* aFrame, nsDisplayItem* aItem) : nsDisplayItem(aFrame) { mList.AppendToTop(aItem); } nsDisplayWrapList::~nsDisplayWrapList() { mList.DeleteAll(); } nsIFrame* nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt, HitTestState* aState) { return mList.HitTest(aBuilder, aPt, aState); } nsRect nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder) { return mList.GetBounds(aBuilder); } 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::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder) { // The only existing consumer of IsVaryingRelativeToMovingFrame is // nsLayoutUtils::ComputeRepaintRegionForCopy, which refrains from calling // this on wrapped lists. NS_WARNING("nsDisplayWrapList::IsVaryingRelativeToMovingFrame called unexpectedly"); // We could try to do something but let's conservatively just return PR_TRUE. return PR_TRUE; } 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) { MOZ_COUNT_CTOR(nsDisplayOpacity); } #ifdef NS_BUILD_REFCNT_LOGGING nsDisplayOpacity::~nsDisplayOpacity() { MOZ_COUNT_DTOR(nsDisplayOpacity); } #endif 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) { float opacity = mFrame->GetStyleDisplay()->mOpacity; nsRect bounds; bounds.IntersectRect(GetBounds(aBuilder), aDirtyRect); nsCOMPtr devCtx; aCtx->GetDeviceContext(*getter_AddRefs(devCtx)); gfxContext* ctx = aCtx->ThebesContext(); ctx->Save(); ctx->NewPath(); gfxRect r(bounds.x, bounds.y, bounds.width, bounds.height); r.ScaleInverse(devCtx->AppUnitsPerDevPixel()); ctx->Rectangle(r, PR_TRUE); ctx->Clip(); if (mNeedAlpha) ctx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA); else ctx->PushGroup(gfxASurface::CONTENT_COLOR); nsDisplayWrapList::Paint(aBuilder, aCtx, bounds); ctx->PopGroupToSource(); ctx->SetOperator(gfxContext::OPERATOR_OVER); ctx->Paint(opacity); ctx->Restore(); } 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(&static_cast(aItem)->mList); return PR_TRUE; } nsDisplayClip::nsDisplayClip(nsIFrame* aFrame, nsIFrame* aClippingFrame, nsDisplayItem* aItem, const nsRect& aRect) : nsDisplayWrapList(aFrame, aItem), mClippingFrame(aClippingFrame), mClip(aRect) { MOZ_COUNT_CTOR(nsDisplayClip); } nsDisplayClip::nsDisplayClip(nsIFrame* aFrame, nsIFrame* aClippingFrame, nsDisplayList* aList, const nsRect& aRect) : nsDisplayWrapList(aFrame, aList), mClippingFrame(aClippingFrame), mClip(aRect) { MOZ_COUNT_CTOR(nsDisplayClip); } nsRect nsDisplayClip::GetBounds(nsDisplayListBuilder* aBuilder) { nsRect r = nsDisplayWrapList::GetBounds(aBuilder); r.IntersectRect(mClip, r); return r; } #ifdef NS_BUILD_REFCNT_LOGGING nsDisplayClip::~nsDisplayClip() { MOZ_COUNT_DTOR(nsDisplayClip); } #endif 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 = static_cast(aItem); if (other->mClip != mClip || other->mClippingFrame != mClippingFrame) return PR_FALSE; mList.AppendToBottom(&other->mList); return PR_TRUE; } nsDisplayWrapList* nsDisplayClip::WrapWithClone(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { return new (aBuilder) nsDisplayClip(aItem->GetUnderlyingFrame(), mClippingFrame, aItem, mClip); } /////////////////////////////////////////////////// // nsDisplayTransform Implementation // // Write #define UNIFIED_CONTINUATIONS here to have the transform property try // to transform content with continuations as one unified block instead of // several smaller ones. This is currently disabled because it doesn't work // correctly, since when the frames are initially being reflown, their // continuations all compute their bounding rects independently of each other // and consequently get the wrong value. Write #define DEBUG_HIT here to have // the nsDisplayTransform class dump out a bunch of information about hit // detection. #undef UNIFIED_CONTINUATIONS #undef DEBUG_HIT /* Returns the bounds of a frame as defined for transforms. If * UNIFIED_CONTINUATIONS is not defined, this is simply the frame's bounding * rectangle, translated to the origin. Otherwise, returns the smallest * rectangle containing a frame and all of its continuations. For example, if * there is a element with several continuations split over several * lines, this function will return the rectangle containing all of those * continuations. This rectangle is relative to the origin of the frame's local * coordinate space. */ #ifndef UNIFIED_CONTINUATIONS nsRect nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame) { NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!"); return nsRect(nsPoint(0, 0), aFrame->GetSize()); } #else nsRect nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame) { NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!"); nsRect result; /* Iterate through the continuation list, unioning together all the * bounding rects. */ for (const nsIFrame *currFrame = aFrame->GetFirstContinuation(); currFrame != nsnull; currFrame = currFrame->GetNextContinuation()) { /* Get the frame rect in local coordinates, then translate back to the * original coordinates. */ result.UnionRect(result, nsRect(currFrame->GetOffsetTo(aFrame), currFrame->GetSize())); } return result; } #endif /* Returns the delta specified by the -moz-tranform-origin property. * This is a positive delta, meaning that it indicates the direction to move * to get from (0, 0) of the frame to the transform origin. */ static gfxPoint GetDeltaToMozTransformOrigin(const nsIFrame* aFrame, float aFactor, const nsRect* aBoundsOverride) { NS_PRECONDITION(aFrame, "Can't get delta for a null frame!"); NS_PRECONDITION(aFrame->GetStyleDisplay()->HasTransform(), "Can't get a delta for an untransformed frame!"); /* For both of the coordinates, if the value of -moz-transform is a * percentage, it's relative to the size of the frame. Otherwise, if it's * a distance, it's already computed for us! */ const nsStyleDisplay* display = aFrame->GetStyleDisplay(); nsRect boundingRect = (aBoundsOverride ? *aBoundsOverride : nsDisplayTransform::GetFrameBoundsForTransform(aFrame)); /* Allows us to access named variables by index. */ gfxPoint result; gfxFloat* coords[2] = {&result.x, &result.y}; const nscoord* dimensions[2] = {&boundingRect.width, &boundingRect.height}; for (PRUint8 index = 0; index < 2; ++index) { /* If the -moz-transform-origin specifies a percentage, take the percentage * of the size of the box. */ if (display->mTransformOrigin[index].GetUnit() == eStyleUnit_Percent) *coords[index] = NSAppUnitsToFloatPixels(*dimensions[index], aFactor) * display->mTransformOrigin[index].GetPercentValue(); /* Otherwise, it's a length. */ else *coords[index] = NSAppUnitsToFloatPixels(display-> mTransformOrigin[index].GetCoordValue(), aFactor); } /* Adjust based on the origin of the rectangle. */ result.x += NSAppUnitsToFloatPixels(boundingRect.x, aFactor); result.y += NSAppUnitsToFloatPixels(boundingRect.y, aFactor); return result; } /* Wraps up the -moz-transform matrix in a change-of-basis matrix pair that * translates from local coordinate space to transform coordinate space, then * hands it back. */ gfxMatrix nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame, const nsPoint &aOrigin, float aFactor, const nsRect* aBoundsOverride) { NS_PRECONDITION(aFrame, "Cannot get transform matrix for a null frame!"); NS_PRECONDITION(aFrame->GetStyleDisplay()->HasTransform(), "Cannot get transform matrix if frame isn't transformed!"); /* Account for the -moz-transform-origin property by translating the * coordinate space to the new origin. */ gfxPoint toMozOrigin = GetDeltaToMozTransformOrigin(aFrame, aFactor, aBoundsOverride); gfxPoint newOrigin = gfxPoint(NSAppUnitsToFloatPixels(aOrigin.x, aFactor), NSAppUnitsToFloatPixels(aOrigin.y, aFactor)); /* Get the underlying transform matrix. This requires us to get the * bounds of the frame. */ const nsStyleDisplay* disp = aFrame->GetStyleDisplay(); nsRect bounds = (aBoundsOverride ? *aBoundsOverride : nsDisplayTransform::GetFrameBoundsForTransform(aFrame)); /* Get the matrix, then change its basis to factor in the origin. */ return nsLayoutUtils::ChangeMatrixBasis (newOrigin + toMozOrigin, disp->mTransform.GetThebesMatrix(bounds, aFactor)); } /* Painting applies the transform, paints the sublist, then unapplies * the transform. */ void nsDisplayTransform::Paint(nsDisplayListBuilder *aBuilder, nsIRenderingContext *aCtx, const nsRect &aDirtyRect) { /* Get the local transform matrix with which we'll transform all wrapped * elements. If this matrix is singular, we shouldn't display anything * and can abort. */ gfxMatrix newTransformMatrix = GetResultingTransformMatrix(mFrame, aBuilder->ToReferenceFrame(mFrame), mFrame->PresContext()->AppUnitsPerDevPixel(), nsnull); if (newTransformMatrix.IsSingular()) return; /* Get the context and automatically save and restore it. */ gfxContext* gfx = aCtx->ThebesContext(); gfxContextAutoSaveRestore autoRestorer(gfx); /* Get the new CTM by applying this transform after all of the * transforms preceding it. */ newTransformMatrix.Multiply(gfx->CurrentMatrix()); /* Set the matrix for the transform based on the old matrix and the new * transform data. */ gfx->SetMatrix(newTransformMatrix); /* Now, send the paint call down. As we do this, we need to be sure to * untransform the dirty rect, since we want everything that's painting to * think that it's painting in its original rectangular coordinate space. */ mStoredList.Paint(aBuilder, aCtx, UntransformRect(aDirtyRect, mFrame, aBuilder->ToReferenceFrame(mFrame))); /* The AutoSaveRestore object will clean things up. */ } /* We don't need to do anything here. */ PRBool nsDisplayTransform::OptimizeVisibility(nsDisplayListBuilder *aBuilder, nsRegion *aVisibleRegion) { return PR_TRUE; } #ifdef DEBUG_HIT #include #endif /* HitTest does some fun stuff with matrix transforms to obtain the answer. */ nsIFrame *nsDisplayTransform::HitTest(nsDisplayListBuilder *aBuilder, nsPoint aPt, HitTestState *aState) { /* Here's how this works: * 1. Get the matrix. If it's singular, abort (clearly we didn't hit * anything). * 2. Invert the matrix. * 3. Use it to transform the point into the correct space. * 4. Pass that point down through to the list's version of HitTest. */ float factor = nsPresContext::AppUnitsPerCSSPixel(); gfxMatrix matrix = GetResultingTransformMatrix(mFrame, aBuilder->ToReferenceFrame(mFrame), factor, nsnull); if (matrix.IsSingular()) return nsnull; /* We want to go from transformed-space to regular space. * Thus we have to invert the matrix, which normally does * the reverse operation (e.g. regular->transformed) */ matrix.Invert(); /* Now, apply the transform and pass it down the channel. */ gfxPoint result = matrix.Transform(gfxPoint(NSAppUnitsToFloatPixels(aPt.x, factor), NSAppUnitsToFloatPixels(aPt.y, factor))); #ifdef DEBUG_HIT printf("Frame: %p\n", dynamic_cast(mFrame)); printf(" Untransformed point: (%f, %f)\n", result.x, result.y); #endif nsIFrame* resultFrame = mStoredList.HitTest(aBuilder, nsPoint(NSFloatPixelsToAppUnits(float(result.x), factor), NSFloatPixelsToAppUnits(float(result.y), factor)), aState); #ifdef DEBUG_HIT if (resultFrame) printf(" Hit! Time: %f, frame: %p\n", static_cast(clock()), dynamic_cast(resultFrame)); printf("=== end of hit test ===\n"); #endif return resultFrame; } /* The bounding rectangle for the object is the overflow rectangle translated * by the reference point. */ nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder *aBuilder) { return mFrame->GetOverflowRect() + aBuilder->ToReferenceFrame(mFrame); } /* The transform is opaque iff the transform consists solely of scales and * transforms and if the underlying content is opaque. Thus if the transform * is of the form * * |a c e| * |b d f| * |0 0 1| * * We need b and c to be zero. */ PRBool nsDisplayTransform::IsOpaque(nsDisplayListBuilder *aBuilder) { const nsStyleDisplay* disp = mFrame->GetStyleDisplay(); return disp->mTransform.GetMainMatrixEntry(1) == 0.0f && disp->mTransform.GetMainMatrixEntry(2) == 0.0f && mStoredList.IsOpaque(aBuilder); } /* The transform is uniform if it fills the entire bounding rect and the * wrapped list is uniform. See IsOpaque for discussion of why this * works. */ PRBool nsDisplayTransform::IsUniform(nsDisplayListBuilder *aBuilder) { const nsStyleDisplay* disp = mFrame->GetStyleDisplay(); return disp->mTransform.GetMainMatrixEntry(1) == 0.0f && disp->mTransform.GetMainMatrixEntry(2) == 0.0f && mStoredList.IsUniform(aBuilder); } /* If UNIFIED_CONTINUATIONS is defined, we can merge two display lists that * share the same underlying content. Otherwise, doing so results in graphical * glitches. */ #ifndef UNIFIED_CONTINUATIONS PRBool nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder, nsDisplayItem *aItem) { return PR_FALSE; } #else PRBool nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder, nsDisplayItem *aItem) { NS_PRECONDITION(aItem, "Why did you try merging with a null item?"); NS_PRECONDITION(aBuilder, "Why did you try merging with a null builder?"); /* Make sure that we're dealing with two transforms. */ if (aItem->GetType() != TYPE_TRANSFORM) return PR_FALSE; /* Check to see that both frames are part of the same content. */ if (aItem->GetUnderlyingFrame()->GetContent() != mFrame->GetContent()) return PR_FALSE; /* Now, move everything over to this frame and signal that * we merged things! */ mStoredList.GetList()-> AppendToBottom(&static_cast(aItem)->mStoredList); return PR_TRUE; } #endif /* TransformRect takes in as parameters a rectangle (in app space) and returns * the smallest rectangle (in app space) containing the transformed image of * that rectangle. That is, it takes the four corners of the rectangle, * transforms them according to the matrix associated with the specified frame, * then returns the smallest rectangle containing the four transformed points. * * @param aUntransformedBounds The rectangle (in app units) to transform. * @param aFrame The frame whose transformation should be applied. * @param aOrigin The delta from the frame origin to the coordinate space origin * @param aBoundsOverride (optional) Force the frame bounds to be the * specified bounds. * @return The smallest rectangle containing the image of the transformed * rectangle. */ nsRect nsDisplayTransform::TransformRect(const nsRect &aUntransformedBounds, const nsIFrame* aFrame, const nsPoint &aOrigin, const nsRect* aBoundsOverride) { NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!"); NS_PRECONDITION(aFrame->GetStyleDisplay()->HasTransform(), "Cannot transform a rectangle if there's no transformation!"); float factor = nsPresContext::AppUnitsPerCSSPixel(); return nsLayoutUtils::MatrixTransformRect (aUntransformedBounds, GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride), factor); } nsRect nsDisplayTransform::UntransformRect(const nsRect &aUntransformedBounds, const nsIFrame* aFrame, const nsPoint &aOrigin) { NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!"); NS_PRECONDITION(aFrame->GetStyleDisplay()->HasTransform(), "Cannot transform a rectangle if there's no transformation!"); /* Grab the matrix. If the transform is degenerate, just hand back the * empty rect. */ float factor = nsPresContext::AppUnitsPerCSSPixel(); gfxMatrix matrix = GetResultingTransformMatrix(aFrame, aOrigin, factor, nsnull); if (matrix.IsSingular()) return nsRect(); /* We want to untransform the matrix, so invert the transformation first! */ matrix.Invert(); return nsLayoutUtils::MatrixTransformRect(aUntransformedBounds, matrix, factor); } #ifdef MOZ_SVG nsDisplaySVGEffects::nsDisplaySVGEffects(nsIFrame* aFrame, nsDisplayList* aList) : nsDisplayWrapList(aFrame, aList), mEffectsFrame(aFrame), mBounds(aFrame->GetOverflowRectRelativeToSelf()) { MOZ_COUNT_CTOR(nsDisplaySVGEffects); } #ifdef NS_BUILD_REFCNT_LOGGING nsDisplaySVGEffects::~nsDisplaySVGEffects() { MOZ_COUNT_DTOR(nsDisplaySVGEffects); } #endif PRBool nsDisplaySVGEffects::IsOpaque(nsDisplayListBuilder* aBuilder) { return PR_FALSE; } nsIFrame* nsDisplaySVGEffects::HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt, HitTestState* aState) { if (!nsSVGIntegrationUtils::HitTestFrameForEffects(mEffectsFrame, aPt - aBuilder->ToReferenceFrame(mEffectsFrame))) return nsnull; return mList.HitTest(aBuilder, aPt, aState); } void nsDisplaySVGEffects::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx, const nsRect& aDirtyRect) { nsSVGIntegrationUtils::PaintFramesWithEffects(aCtx, mEffectsFrame, aDirtyRect, aBuilder, &mList); } PRBool nsDisplaySVGEffects::OptimizeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) { nsRegion vis; vis.And(*aVisibleRegion, GetBounds(aBuilder)); nsPoint offset = aBuilder->ToReferenceFrame(mEffectsFrame); nsRect dirtyRect = nsSVGIntegrationUtils::GetRequiredSourceForInvalidArea(mEffectsFrame, vis.GetBounds() - offset) + offset; // Our children may be translucent so we should not allow them to subtract // area from aVisibleRegion. nsRegion childrenVisibleRegion(dirtyRect); nsDisplayWrapList::OptimizeVisibility(aBuilder, &childrenVisibleRegion); return !vis.IsEmpty(); } PRBool nsDisplaySVGEffects::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { if (aItem->GetType() != TYPE_SVG_EFFECTS) 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 nsDisplaySVGEffects if (aItem->GetUnderlyingFrame()->GetContent() != mFrame->GetContent()) return PR_FALSE; nsDisplaySVGEffects* other = static_cast(aItem); mList.AppendToBottom(&other->mList); mBounds.UnionRect(mBounds, other->mBounds + other->mEffectsFrame->GetOffsetTo(mEffectsFrame)); return PR_TRUE; } #endif