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gecko-dev/layout/base/nsDisplayList.cpp

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/* -*- 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 "nsRenderingContext.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"
#include "nsSVGIntegrationUtils.h"
#include "nsLayoutUtils.h"
#include "nsIScrollableFrame.h"
#include "nsThemeConstants.h"
#include "imgIContainer.h"
#include "nsIInterfaceRequestorUtils.h"
#include "BasicLayers.h"
#include "nsBoxFrame.h"
#include "nsViewportFrame.h"
using namespace mozilla;
using namespace mozilla::layers;
typedef FrameMetrics::ViewID ViewID;
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
Mode aMode, PRBool aBuildCaret)
: mReferenceFrame(aReferenceFrame),
mIgnoreScrollFrame(nsnull),
mCurrentTableItem(nsnull),
mFinalTransparentRegion(nsnull),
mMode(aMode),
mBuildCaret(aBuildCaret),
mIgnoreSuppression(PR_FALSE),
mHadToIgnoreSuppression(PR_FALSE),
mIsAtRootOfPseudoStackingContext(PR_FALSE),
mIncludeAllOutOfFlows(PR_FALSE),
mSelectedFramesOnly(PR_FALSE),
mAccurateVisibleRegions(PR_FALSE),
mInTransform(PR_FALSE),
mSyncDecodeImages(PR_FALSE),
mIsPaintingToWindow(PR_FALSE),
mSnappingEnabled(mMode != EVENT_DELIVERY),
mHasDisplayPort(PR_FALSE),
mHasFixedItems(PR_FALSE)
{
MOZ_COUNT_CTOR(nsDisplayListBuilder);
PL_InitArenaPool(&mPool, "displayListArena", 1024,
NS_MAX(NS_ALIGNMENT_OF(void*),NS_ALIGNMENT_OF(double))-1);
nsPresContext* pc = aReferenceFrame->PresContext();
nsIPresShell *shell = pc->PresShell();
if (pc->IsRenderingOnlySelection()) {
nsCOMPtr<nsISelectionController> selcon(do_QueryInterface(shell));
if (selcon) {
selcon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mBoundingSelection));
}
}
if(mReferenceFrame->GetType() == nsGkAtoms::viewportFrame) {
ViewportFrame* viewportFrame = static_cast<ViewportFrame*>(mReferenceFrame);
if (!viewportFrame->GetChildList(nsIFrame::kFixedList).IsEmpty()) {
mHasFixedItems = PR_TRUE;
}
}
LayerBuilder()->Init(this);
PR_STATIC_ASSERT(nsDisplayItem::TYPE_MAX < (1 << nsDisplayItem::TYPE_BITS));
}
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 PRBool IsFixedFrame(nsIFrame* aFrame)
{
return aFrame && aFrame->GetParent() && !aFrame->GetParent()->GetParent();
}
static PRBool IsFixedItem(nsDisplayItem *aItem, nsDisplayListBuilder* aBuilder,
PRBool* aIsFixedBackground)
{
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(aItem, aBuilder, aIsFixedBackground);
return activeScrolledRoot &&
!nsLayoutUtils::ScrolledByViewportScrolling(activeScrolledRoot,
aBuilder);
}
static PRBool ForceVisiblityForFixedItem(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
PRBool* aIsFixedBackground)
{
return aBuilder->GetDisplayPort() && aBuilder->GetHasFixedItems() &&
IsFixedItem(aItem, aBuilder, aIsFixedBackground);
}
void nsDisplayListBuilder::SetDisplayPort(const nsRect& aDisplayPort)
{
static bool fixedPositionLayersEnabled = getenv("MOZ_ENABLE_FIXED_POSITION_LAYERS") != 0;
if (fixedPositionLayersEnabled) {
mHasDisplayPort = PR_TRUE;
mDisplayPort = aDisplayPort;
}
}
void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame,
nsIFrame* aFrame,
const nsRect& aDirtyRect)
{
nsRect dirty = aDirtyRect - aFrame->GetOffsetTo(aDirtyFrame);
nsRect overflowRect = aFrame->GetVisualOverflowRect();
if (mHasDisplayPort && IsFixedFrame(aFrame)) {
dirty = overflowRect;
}
if (!dirty.IntersectRect(dirty, overflowRect))
return;
aFrame->Properties().Set(nsDisplayListBuilder::OutOfFlowDirtyRectProperty(),
new nsRect(dirty));
MarkFrameForDisplay(aFrame, aDirtyFrame);
}
static void UnmarkFrameForDisplay(nsIFrame* aFrame) {
nsPresContext* presContext = aFrame->PresContext();
presContext->PropertyTable()->
Delete(aFrame, nsDisplayListBuilder::OutOfFlowDirtyRectProperty());
nsFrameManager* frameManager = 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);
}
}
static void RecordFrameMetrics(nsIFrame* aForFrame,
nsIFrame* aScrollFrame,
ContainerLayer* aRoot,
const nsRect& aVisibleRect,
const nsRect& aViewport,
nsRect* aDisplayPort,
ViewID aScrollId,
const nsDisplayItem::ContainerParameters& aContainerParameters) {
nsPresContext* presContext = aForFrame->PresContext();
PRInt32 auPerDevPixel = presContext->AppUnitsPerDevPixel();
nsIntRect visible = aVisibleRect.ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
aRoot->SetVisibleRegion(nsIntRegion(visible));
FrameMetrics metrics;
metrics.mViewport = aViewport.ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
if (aDisplayPort) {
metrics.mDisplayPort = aDisplayPort->ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
}
nsIScrollableFrame* scrollableFrame = nsnull;
if (aScrollFrame)
scrollableFrame = aScrollFrame->GetScrollTargetFrame();
if (scrollableFrame) {
nsSize contentSize =
scrollableFrame->GetScrollRange().Size() +
scrollableFrame->GetScrollPortRect().Size();
metrics.mContentSize = contentSize.ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
metrics.mViewportScrollOffset = scrollableFrame->GetScrollPosition().ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
}
else {
nsSize contentSize = aForFrame->GetSize();
metrics.mContentSize = contentSize.ScaleToNearestPixels(
aContainerParameters.mXScale, aContainerParameters.mYScale, auPerDevPixel);
}
metrics.mScrollId = aScrollId;
aRoot->SetFrameMetrics(metrics);
}
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);
MOZ_COUNT_DTOR(nsDisplayListBuilder);
}
PRUint32
nsDisplayListBuilder::GetBackgroundPaintFlags() {
PRUint32 flags = 0;
if (mSyncDecodeImages) {
flags |= nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES;
}
if (mIsPaintingToWindow) {
flags |= nsCSSRendering::PAINTBG_TO_WINDOW;
}
return flags;
}
static PRUint64 RegionArea(const nsRegion& aRegion)
{
PRUint64 area = 0;
nsRegionRectIterator iter(aRegion);
const nsRect* r;
while ((r = iter.Next()) != nsnull) {
area += PRUint64(r->width)*r->height;
}
return area;
}
void
nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
const nsRegion& aRegion)
{
if (aRegion.IsEmpty())
return;
nsRegion tmp;
tmp.Sub(*aVisibleRegion, aRegion);
// Don't let *aVisibleRegion get too complex, but don't let it fluff out
// to its bounds either, which can be very bad (see bug 516740).
// Do let aVisibleRegion get more complex if by doing so we reduce its
// area by at least half.
if (GetAccurateVisibleRegions() || tmp.GetNumRects() <= 15 ||
RegionArea(tmp) <= RegionArea(*aVisibleRegion)/2) {
*aVisibleRegion = tmp;
}
}
nsCaret *
nsDisplayListBuilder::GetCaret() {
nsRefPtr<nsCaret> caret = CurrentPresShellState()->mPresShell->GetCaret();
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();
state->mPresShell->UpdateCanvasBackground();
if (mIsPaintingToWindow) {
mReferenceFrame->AddPaintedPresShell(state->mPresShell);
state->mPresShell->IncrementPaintCount();
}
PRBool buildCaret = mBuildCaret;
if (mIgnoreSuppression || !state->mPresShell->IsPaintingSuppressed()) {
if (state->mPresShell->IsPaintingSuppressed()) {
mHadToIgnoreSuppression = PR_TRUE;
}
state->mIsBackgroundOnly = PR_FALSE;
} else {
state->mIsBackgroundOnly = PR_TRUE;
buildCaret = PR_FALSE;
}
if (!buildCaret)
return;
nsRefPtr<nsCaret> caret = state->mPresShell->GetCaret();
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,
const nsFrameList& aFrames,
const nsRect& aDirtyRect) {
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
mFramesMarkedForDisplay.AppendElement(e.get());
MarkOutOfFlowFrameForDisplay(aDirtyFrame, e.get(), aDirtyRect);
}
}
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());
}
void
nsDisplayList::FlattenTo(nsTArray<nsDisplayItem*>* aElements) {
nsDisplayItem* item;
while ((item = RemoveBottom()) != nsnull) {
if (item->GetType() == nsDisplayItem::TYPE_WRAP_LIST) {
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;
}
PRBool
nsDisplayList::ComputeVisibilityForRoot(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
return ComputeVisibilityForSublist(aBuilder, aVisibleRegion, r.GetBounds(), r.GetBounds());
}
static nsRegion
TreatAsOpaque(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder,
PRBool* aTransparentBackground)
{
nsRegion opaque = aItem->GetOpaqueRegion(aBuilder, aTransparentBackground);
if (aBuilder->IsForPluginGeometry()) {
// Treat all chrome items as opaque, unless their frames are opacity:0.
// Since opacity:0 frames generate an nsDisplayOpacity, that item will
// not be treated as opaque here, so opacity:0 chrome content will be
// effectively ignored, as it should be.
nsIFrame* f = aItem->GetUnderlyingFrame();
if (f && f->PresContext()->IsChrome() && f->GetStyleDisplay()->mOpacity != 0.0) {
opaque = aItem->GetBounds(aBuilder);
}
}
return opaque;
}
static nsRect GetDisplayPortBounds(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
PRBool aIgnoreTransform)
{
nsIFrame* frame = aItem->GetUnderlyingFrame();
const nsRect* displayport = aBuilder->GetDisplayPort();
if (aIgnoreTransform) {
return *displayport;
}
return nsLayoutUtils::TransformRectToBoundsInAncestor(
frame,
nsRect(0, 0, displayport->width, displayport->height),
aBuilder->ReferenceFrame());
}
PRBool
nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aListVisibleBounds,
const nsRect& aAllowVisibleRegionExpansion) {
#ifdef DEBUG
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
NS_ASSERTION(r.GetBounds().IsEqualInterior(aListVisibleBounds),
"bad aListVisibleBounds");
#endif
mVisibleRect = aListVisibleBounds;
PRBool anyVisible = PR_FALSE;
nsAutoTArray<nsDisplayItem*, 512> elements;
FlattenTo(&elements);
PRBool forceTransparentSurface = PR_FALSE;
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;
}
nsDisplayList* list = item->GetList();
if (list && item->ShouldFlattenAway(aBuilder)) {
// The elements on the list >= i no longer serve any use.
elements.SetLength(i);
list->FlattenTo(&elements);
i = elements.Length();
item->~nsDisplayItem();
continue;
}
nsRect bounds = item->GetBounds(aBuilder);
nsRegion itemVisible;
PRBool isFixedBackground;
if (ForceVisiblityForFixedItem(aBuilder, item, &isFixedBackground)) {
itemVisible.And(GetDisplayPortBounds(aBuilder, item, isFixedBackground), bounds);
} else {
itemVisible.And(*aVisibleRegion, bounds);
}
item->mVisibleRect = itemVisible.GetBounds();
if (item->ComputeVisibility(aBuilder, aVisibleRegion, aAllowVisibleRegionExpansion)) {
anyVisible = PR_TRUE;
PRBool transparentBackground = PR_FALSE;
nsRegion opaque = TreatAsOpaque(item, aBuilder, &transparentBackground);
// Subtract opaque item from the visible region
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
forceTransparentSurface = forceTransparentSurface || transparentBackground;
}
AppendToBottom(item);
}
mIsOpaque = !aVisibleRegion->Intersects(mVisibleRect);
mForceTransparentSurface = forceTransparentSurface;
#ifdef DEBUG
mDidComputeVisibility = PR_TRUE;
#endif
return anyVisible;
}
void nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
PRUint32 aFlags) const {
PaintForFrame(aBuilder, aCtx, aBuilder->ReferenceFrame(), aFlags);
}
/**
* We paint by executing a layer manager transaction, constructing a
* single layer representing the display list, and then making it the
* root of the layer manager, drawing into the ThebesLayers.
*/
void nsDisplayList::PaintForFrame(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
nsIFrame* aForFrame,
PRUint32 aFlags) const {
NS_ASSERTION(mDidComputeVisibility,
"Must call ComputeVisibility before calling Paint");
nsRefPtr<LayerManager> layerManager;
bool allowRetaining = false;
bool doBeginTransaction = true;
if (aFlags & PAINT_USE_WIDGET_LAYERS) {
nsIFrame* referenceFrame = aBuilder->ReferenceFrame();
NS_ASSERTION(referenceFrame == nsLayoutUtils::GetDisplayRootFrame(referenceFrame),
"Reference frame must be a display root for us to use the layer manager");
nsIWidget* window = referenceFrame->GetNearestWidget();
if (window) {
layerManager = window->GetLayerManager(&allowRetaining);
if (layerManager) {
doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION);
}
}
}
if (!layerManager) {
if (!aCtx) {
NS_WARNING("Nowhere to paint into");
return;
}
layerManager = new BasicLayerManager();
}
if (aFlags & PAINT_FLUSH_LAYERS) {
FrameLayerBuilder::InvalidateAllLayers(layerManager);
}
if (doBeginTransaction) {
if (aCtx) {
layerManager->BeginTransactionWithTarget(aCtx->ThebesContext());
} else {
layerManager->BeginTransaction();
}
}
if (allowRetaining) {
aBuilder->LayerBuilder()->DidBeginRetainedLayerTransaction(layerManager);
}
nsPresContext* presContext = aForFrame->PresContext();
nsIPresShell* presShell = presContext->GetPresShell();
nsDisplayItem::ContainerParameters containerParameters
(presShell->GetXResolution(), presShell->GetYResolution());
nsRefPtr<ContainerLayer> root = aBuilder->LayerBuilder()->
BuildContainerLayerFor(aBuilder, layerManager, aForFrame, nsnull, *this,
containerParameters, nsnull);
if (!root)
return;
// Root is being scaled up by the X/Y resolution. Scale it back down.
gfx3DMatrix rootTransform = root->GetTransform()*
gfx3DMatrix::ScalingMatrix(1.0f/containerParameters.mXScale,
1.0f/containerParameters.mYScale, 1.0f);
root->SetTransform(rootTransform);
ViewID id = presContext->IsRootContentDocument() ? FrameMetrics::ROOT_SCROLL_ID
: FrameMetrics::NULL_SCROLL_ID;
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
nsRect displayport;
bool usingDisplayport = false;
if (rootScrollFrame) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayport = nsLayoutUtils::GetDisplayPort(content, &displayport);
}
}
RecordFrameMetrics(aForFrame, rootScrollFrame,
root, mVisibleRect, mVisibleRect,
(usingDisplayport ? &displayport : nsnull), id,
containerParameters);
layerManager->SetRoot(root);
aBuilder->LayerBuilder()->WillEndTransaction(layerManager);
layerManager->EndTransaction(FrameLayerBuilder::DrawThebesLayer,
aBuilder);
aBuilder->LayerBuilder()->DidEndTransaction(layerManager);
if (aFlags & PAINT_FLUSH_LAYERS) {
FrameLayerBuilder::InvalidateAllLayers(layerManager);
}
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::DeleteAll() {
nsDisplayItem* item;
while ((item = RemoveBottom()) != nsnull) {
item->~nsDisplayItem();
}
}
static PRBool
GetMouseThrough(const nsIFrame* aFrame)
{
if (!aFrame->IsBoxFrame())
return PR_FALSE;
const nsIFrame* frame = aFrame;
while (frame) {
if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_ALWAYS) {
return PR_TRUE;
} else if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_NEVER) {
return PR_FALSE;
}
frame = frame->GetParentBox();
}
return PR_FALSE;
}
void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames) 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 (aRect.Intersects(item->GetBounds(aBuilder))) {
nsAutoTArray<nsIFrame*, 16> outFrames;
item->HitTest(aBuilder, aRect, aState, &outFrames);
for (PRUint32 j = 0; j < outFrames.Length(); j++) {
nsIFrame *f = outFrames.ElementAt(j);
// Handle the XUL 'mousethrough' feature and 'pointer-events'.
if (!GetMouseThrough(f) &&
f->GetStyleVisibility()->mPointerEvents != NS_STYLE_POINTER_EVENTS_NONE) {
aOutFrames->AppendElement(f);
}
}
}
}
NS_ASSERTION(aState->mItemBuffer.Length() == PRUint32(itemBufferStart),
"How did we forget to pop some elements?");
}
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<nsIContent*>(aClosure)) <= 0;
}
static PRBool IsZPositionLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
if (!aItem1->GetUnderlyingFrame()->Preserves3D() ||
!aItem1->GetUnderlyingFrame()->Preserves3D()) {
return IsContentLEQ(aItem1, aItem2, aClosure);
}
nsIFrame* ancestor;
gfx3DMatrix matrix1 = aItem1->GetUnderlyingFrame()->GetTransformMatrix(&ancestor);
gfx3DMatrix matrix2 = aItem2->GetUnderlyingFrame()->GetTransformMatrix(&ancestor);
if (matrix1._43 == matrix2._43) {
return IsContentLEQ(aItem1, aItem2, aClosure);
}
return matrix1._43 < matrix2._43;
}
static PRBool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
// These GetUnderlyingFrame calls return non-null because we're only used
// in sorting. Note that we can't just take the difference of the two
// z-indices here, because that might overflow a 32-bit int.
PRInt32 index1 = nsLayoutUtils::GetZIndex(aItem1->GetUnderlyingFrame());
PRInt32 index2 = nsLayoutUtils::GetZIndex(aItem2->GetUnderlyingFrame());
if (index1 == index2)
return IsZPositionLEQ(aItem1, aItem2, aClosure);
return index1 < index2;
}
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<nsDisplayWrapList*>(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::SortByZPosition(nsDisplayListBuilder* aBuilder,
nsIContent* aCommonAncestor) {
Sort(aBuilder, IsZPositionLEQ, aCommonAncestor);
}
void nsDisplayList::Sort(nsDisplayListBuilder* aBuilder,
SortLEQ aCmp, void* aClosure) {
ExplodeAnonymousChildLists(aBuilder);
::Sort(this, Count(), aCmp, aClosure);
}
PRBool nsDisplayItem::RecomputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
nsRect bounds = GetBounds(aBuilder);
nsRegion itemVisible;
PRBool isFixedBackground;
if (ForceVisiblityForFixedItem(aBuilder, this, &isFixedBackground)) {
itemVisible.And(GetDisplayPortBounds(aBuilder, this, isFixedBackground), bounds);
} else {
itemVisible.And(*aVisibleRegion, bounds);
}
mVisibleRect = itemVisible.GetBounds();
// When we recompute visibility within layers we don't need to
// expand the visible region for content behind plugins (the plugin
// is not in the layer).
if (!ComputeVisibility(aBuilder, aVisibleRegion, nsRect()))
return PR_FALSE;
PRBool forceTransparentBackground;
nsRegion opaque = TreatAsOpaque(this, aBuilder, &forceTransparentBackground);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
return PR_TRUE;
}
// Note that even if the rectangle we draw and snap is smaller than aRect,
// it's OK to call this to get a bounding rect for what we'll draw, because
// snapping a rectangle which is contained in R always gives you a
// rectangle which is contained in the snapped R.
static nsRect
SnapBounds(PRBool aSnappingEnabled, nsPresContext* aPresContext,
const nsRect& aRect) {
nsRect r = aRect;
if (aSnappingEnabled) {
nscoord appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
r = r.ToNearestPixels(appUnitsPerDevPixel).ToAppUnits(appUnitsPerDevPixel);
}
return r;
}
nsRect
nsDisplaySolidColor::GetBounds(nsDisplayListBuilder* aBuilder)
{
nsPresContext* presContext = mFrame->PresContext();
return SnapBounds(mSnappingEnabled, presContext, mBounds);
}
void
nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
aCtx->SetColor(mColor);
aCtx->FillRect(mVisibleRect);
}
static void
RegisterThemeGeometry(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
{
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
// Bail out if we're in a transformed subtree
if (f->IsTransformed())
return;
// Bail out if we're not in the displayRoot's document
if (!f->GetParent() && f != displayRoot)
return;
}
nsRect borderBox(aFrame->GetOffsetTo(displayRoot), aFrame->GetSize());
aBuilder->RegisterThemeGeometry(aFrame->GetStyleDisplay()->mAppearance,
borderBox.ToNearestPixels(aFrame->PresContext()->AppUnitsPerDevPixel()));
}
nsDisplayBackground::nsDisplayBackground(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame),
mSnappingEnabled(aBuilder->IsSnappingEnabled() && !aBuilder->IsInTransform())
{
MOZ_COUNT_CTOR(nsDisplayBackground);
const nsStyleDisplay* disp = mFrame->GetStyleDisplay();
mIsThemed = mFrame->IsThemed(disp, &mThemeTransparency);
if (mIsThemed) {
// Perform necessary RegisterThemeGeometry
if (disp->mAppearance == NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR ||
disp->mAppearance == NS_THEME_TOOLBAR) {
RegisterThemeGeometry(aBuilder, aFrame);
}
} else {
// Set HasFixedItems if we construct a background-attachment:fixed item
nsPresContext* presContext = mFrame->PresContext();
nsStyleContext* bgSC;
PRBool hasBG = nsCSSRendering::FindBackground(presContext, mFrame, &bgSC);
if (hasBG && bgSC->GetStyleBackground()->HasFixedBackground()) {
aBuilder->SetHasFixedItems();
}
}
}
// Helper for RoundedRectIntersectsRect.
static PRBool
CheckCorner(nscoord aXOffset, nscoord aYOffset,
nscoord aXRadius, nscoord aYRadius)
{
NS_ABORT_IF_FALSE(aXOffset > 0 && aYOffset > 0,
"must not pass nonpositives to CheckCorner");
NS_ABORT_IF_FALSE(aXRadius >= 0 && aYRadius >= 0,
"must not pass negatives to CheckCorner");
// Avoid floating point math unless we're either (1) within the
// quarter-ellipse area at the rounded corner or (2) outside the
// rounding.
if (aXOffset >= aXRadius || aYOffset >= aYRadius)
return PR_TRUE;
// Convert coordinates to a unit circle with (0,0) as the center of
// curvature, and see if we're inside the circle or outside.
float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
return scaledX * scaledX + scaledY * scaledY < 1.0f;
}
/**
* Return whether any part of aTestRect is inside of the rounded
* rectangle formed by aBounds and aRadii (which are indexed by the
* NS_CORNER_* constants in nsStyleConsts.h).
*
* See also RoundedRectContainsRect.
*/
static PRBool
RoundedRectIntersectsRect(const nsRect& aRoundedRect, nscoord aRadii[8],
const nsRect& aTestRect)
{
NS_ABORT_IF_FALSE(aTestRect.Intersects(aRoundedRect),
"we should already have tested basic rect intersection");
// distances from this edge of aRoundedRect to opposite edge of aTestRect,
// which we know are positive due to the Intersects check above.
nsMargin insets;
insets.top = aTestRect.YMost() - aRoundedRect.y;
insets.right = aRoundedRect.XMost() - aTestRect.x;
insets.bottom = aRoundedRect.YMost() - aTestRect.y;
insets.left = aTestRect.XMost() - aRoundedRect.x;
// Check whether the bottom-right corner of aTestRect is inside the
// top left corner of aBounds when rounded by aRadii, etc. If any
// corner is not, then fail; otherwise succeed.
return CheckCorner(insets.left, insets.top,
aRadii[NS_CORNER_TOP_LEFT_X],
aRadii[NS_CORNER_TOP_LEFT_Y]) &&
CheckCorner(insets.right, insets.top,
aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_TOP_RIGHT_Y]) &&
CheckCorner(insets.right, insets.bottom,
aRadii[NS_CORNER_BOTTOM_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) &&
CheckCorner(insets.left, insets.bottom,
aRadii[NS_CORNER_BOTTOM_LEFT_X],
aRadii[NS_CORNER_BOTTOM_LEFT_Y]);
}
// Check that the rounded border of aFrame, added to aToReferenceFrame,
// intersects aRect. Assumes that the unrounded border has already
// been checked for intersection.
static PRBool
RoundedBorderIntersectsRect(nsIFrame* aFrame,
const nsPoint& aFrameToReferenceFrame,
const nsRect& aTestRect)
{
if (!nsRect(aFrameToReferenceFrame, aFrame->GetSize()).Intersects(aTestRect))
return PR_FALSE;
nscoord radii[8];
return !aFrame->GetBorderRadii(radii) ||
RoundedRectIntersectsRect(nsRect(aFrameToReferenceFrame,
aFrame->GetSize()),
radii, aTestRect);
}
// Returns TRUE if aContainedRect is guaranteed to be contained in
// the rounded rect defined by aRoundedRect and aRadii. Complex cases are
// handled conservatively by returning FALSE in some situations where
// a more thorough analysis could return TRUE.
//
// See also RoundedRectIntersectsRect.
static PRBool RoundedRectContainsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect) {
nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(aRoundedRect, aRadii, aContainedRect);
return rgn.Contains(aContainedRect);
}
void
nsDisplayBackground::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (mIsThemed) {
// For theme backgrounds, assume that any point in our border rect is a hit.
if (!nsRect(ToReferenceFrame(), mFrame->GetSize()).Intersects(aRect))
return;
} else {
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
}
aOutFrames->AppendElement(mFrame);
}
PRBool
nsDisplayBackground::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion)) {
return PR_FALSE;
}
// Return false if the background was propagated away from this
// frame. We don't want this display item to show up and confuse
// anything.
nsStyleContext* bgSC;
return mIsThemed ||
nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bgSC);
}
nsRegion
nsDisplayBackground::GetInsideClipRegion(nsPresContext* aPresContext,
PRUint8 aClip, const nsRect& aRect)
{
nsRegion result;
if (aRect.IsEmpty())
return result;
nscoord radii[8];
nsRect clipRect;
PRBool haveRadii;
switch (aClip) {
case NS_STYLE_BG_CLIP_BORDER:
haveRadii = mFrame->GetBorderRadii(radii);
clipRect = nsRect(ToReferenceFrame(), mFrame->GetSize());
break;
case NS_STYLE_BG_CLIP_PADDING:
haveRadii = mFrame->GetPaddingBoxBorderRadii(radii);
clipRect = mFrame->GetPaddingRect() - mFrame->GetPosition() + ToReferenceFrame();
break;
case NS_STYLE_BG_CLIP_CONTENT:
haveRadii = mFrame->GetContentBoxBorderRadii(radii);
clipRect = mFrame->GetContentRect() - mFrame->GetPosition() + ToReferenceFrame();
break;
default:
NS_NOTREACHED("Unknown clip type");
return result;
}
nsRect inputRect = SnapBounds(mSnappingEnabled, aPresContext, aRect);
clipRect = SnapBounds(mSnappingEnabled, aPresContext, clipRect);
if (haveRadii) {
result = nsLayoutUtils::RoundedRectIntersectRect(clipRect, radii, inputRect);
} else {
nsRect r;
r.IntersectRect(clipRect, inputRect);
result = r;
}
return result;
}
nsRegion
nsDisplayBackground::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
PRBool* aForceTransparentSurface) {
nsRegion result;
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
// theme background overrides any other background
if (mIsThemed) {
if (aForceTransparentSurface) {
const nsStyleDisplay* disp = mFrame->GetStyleDisplay();
*aForceTransparentSurface = disp->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
disp->mAppearance == NS_THEME_WIN_GLASS;
}
if (mThemeTransparency == nsITheme::eOpaque) {
result = GetBounds(aBuilder);
}
return result;
}
nsStyleContext* bgSC;
nsPresContext* presContext = mFrame->PresContext();
if (!nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bgSC))
return result;
const nsStyleBackground* bg = bgSC->GetStyleBackground();
const nsStyleBackground::Layer& bottomLayer = bg->BottomLayer();
nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize());
if (NS_GET_A(bg->mBackgroundColor) == 255 &&
!nsCSSRendering::IsCanvasFrame(mFrame)) {
result = GetInsideClipRegion(presContext, bottomLayer.mClip, borderBox);
}
// For policies other than EACH_BOX, don't try to optimize here, since
// this could easily lead to O(N^2) behavior inside InlineBackgroundData,
// which expects frames to be sent to it in content order, not reverse
// content order which we'll produce here.
// Of course, if there's only one frame in the flow, it doesn't matter.
if (bg->mBackgroundInlinePolicy == NS_STYLE_BG_INLINE_POLICY_EACH_BOX ||
(!mFrame->GetPrevContinuation() && !mFrame->GetNextContinuation())) {
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
const nsStyleBackground::Layer& layer = bg->mLayers[i];
if (layer.mImage.IsOpaque()) {
nsRect r = nsCSSRendering::GetBackgroundLayerRect(presContext, mFrame,
borderBox, *bg, layer);
result.Or(result, GetInsideClipRegion(presContext, layer.mClip, r));
}
}
}
return result;
}
PRBool
nsDisplayBackground::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
// theme background overrides any other background
if (mIsThemed) {
const nsStyleDisplay* disp = mFrame->GetStyleDisplay();
if (disp->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
disp->mAppearance == NS_THEME_WIN_GLASS) {
*aColor = NS_RGBA(0,0,0,0);
return PR_TRUE;
}
return PR_FALSE;
}
nsStyleContext *bgSC;
PRBool hasBG =
nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bgSC);
if (!hasBG) {
*aColor = NS_RGBA(0,0,0,0);
return PR_TRUE;
}
const nsStyleBackground* bg = bgSC->GetStyleBackground();
if (bg->BottomLayer().mImage.IsEmpty() &&
bg->mImageCount == 1 &&
!nsLayoutUtils::HasNonZeroCorner(mFrame->GetStyleBorder()->mBorderRadius) &&
bg->BottomLayer().mClip == NS_STYLE_BG_CLIP_BORDER) {
// Canvas frames don't actually render their background color, since that
// gets propagated to the solid color of the viewport
// (see nsCSSRendering::PaintBackgroundWithSC)
*aColor = nsCSSRendering::IsCanvasFrame(mFrame) ? NS_RGBA(0,0,0,0)
: bg->mBackgroundColor;
return PR_TRUE;
}
return PR_FALSE;
}
PRBool
nsDisplayBackground::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
{
// theme background overrides any other background and is never fixed
if (mIsThemed)
return PR_FALSE;
nsPresContext* presContext = mFrame->PresContext();
nsStyleContext *bgSC;
PRBool hasBG =
nsCSSRendering::FindBackground(presContext, mFrame, &bgSC);
if (!hasBG)
return PR_FALSE;
const nsStyleBackground* bg = bgSC->GetStyleBackground();
if (!bg->HasFixedBackground())
return PR_FALSE;
// If aFrame is mFrame or an ancestor in this document, and aFrame is
// not the viewport frame, then moving aFrame will move mFrame
// relative to the viewport, so our fixed-pos background will change.
return aFrame->GetParent() &&
(aFrame == mFrame ||
nsLayoutUtils::IsProperAncestorFrame(aFrame, mFrame));
}
PRBool
nsDisplayBackground::ShouldFixToViewport(nsDisplayListBuilder* aBuilder)
{
if (mIsThemed)
return PR_FALSE;
nsPresContext* presContext = mFrame->PresContext();
nsStyleContext* bgSC;
PRBool hasBG =
nsCSSRendering::FindBackground(presContext, mFrame, &bgSC);
if (!hasBG)
return PR_FALSE;
const nsStyleBackground* bg = bgSC->GetStyleBackground();
if (!bg->HasFixedBackground())
return PR_FALSE;
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
const nsStyleBackground::Layer& layer = bg->mLayers[i];
if (layer.mAttachment != NS_STYLE_BG_ATTACHMENT_FIXED &&
!layer.mImage.IsEmpty()) {
return PR_FALSE;
}
if (layer.mClip != NS_STYLE_BG_CLIP_BORDER)
return PR_FALSE;
}
if (nsLayoutUtils::HasNonZeroCorner(mFrame->GetStyleBorder()->mBorderRadius))
return PR_FALSE;
nsRect bounds = GetBounds(aBuilder);
nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
if (!rootScrollFrame)
return PR_FALSE;
nsIScrollableFrame* scrollable = do_QueryFrame(rootScrollFrame);
nsRect scrollport = scrollable->GetScrollPortRect() +
aBuilder->ToReferenceFrame(rootScrollFrame);
return bounds.Contains(scrollport);
}
void
nsDisplayBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
PRUint32 flags = aBuilder->GetBackgroundPaintFlags();
nsDisplayItem* nextItem = GetAbove();
if (nextItem && nextItem->GetUnderlyingFrame() == mFrame &&
nextItem->GetType() == TYPE_BORDER) {
flags |= nsCSSRendering::PAINTBG_WILL_PAINT_BORDER;
}
nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
flags);
}
nsRect
nsDisplayBackground::GetBounds(nsDisplayListBuilder* aBuilder) {
nsRect r(nsPoint(0,0), mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
if (mIsThemed) {
presContext->GetTheme()->
GetWidgetOverflow(presContext->DeviceContext(), mFrame,
mFrame->GetStyleDisplay()->mAppearance, &r);
}
return SnapBounds(mSnappingEnabled, presContext, r + ToReferenceFrame());
}
nsRect
nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder) {
return mFrame->GetVisualOverflowRectRelativeToSelf() + ToReferenceFrame();
}
void
nsDisplayOutline::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
// TODO join outlines together
nsPoint offset = ToReferenceFrame();
nsCSSRendering::PaintOutline(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->GetStyleContext());
}
PRBool
nsDisplayOutline::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion)) {
return PR_FALSE;
}
const nsStyleOutline* outline = mFrame->GetStyleOutline();
nsRect borderBox(ToReferenceFrame(), mFrame->GetSize());
if (borderBox.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
nsDisplayEventReceiver::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
void
nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
// 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, ToReferenceFrame());
}
PRBool
nsDisplayBorder::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion)) {
return PR_FALSE;
}
nsRect paddingRect = mFrame->GetPaddingRect() - mFrame->GetPosition() +
ToReferenceFrame();
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,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->GetStyleContext(),
mFrame->GetSkipSides());
}
nsRect
nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder)
{
return SnapBounds(mSnappingEnabled, mFrame->PresContext(),
nsRect(ToReferenceFrame(), mFrame->GetSize()));
}
// Given a region, compute a conservative approximation to it as a list
// of rectangles that aren't vertically adjacent (i.e., vertically
// adjacent or overlapping rectangles are combined).
// Right now this is only approximate, some vertically overlapping rectangles
// aren't guaranteed to be combined.
static void
ComputeDisjointRectangles(const nsRegion& aRegion,
nsTArray<nsRect>* aRects) {
nscoord accumulationMargin = nsPresContext::CSSPixelsToAppUnits(25);
nsRect accumulated;
nsRegionRectIterator iter(aRegion);
while (PR_TRUE) {
const nsRect* r = iter.Next();
if (r && !accumulated.IsEmpty() &&
accumulated.YMost() >= r->y - accumulationMargin) {
accumulated.UnionRect(accumulated, *r);
continue;
}
if (!accumulated.IsEmpty()) {
aRects->AppendElement(accumulated);
accumulated.SetEmpty();
}
if (!r)
break;
accumulated = *r;
}
}
void
nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
for (PRUint32 i = 0; i < rects.Length(); ++i) {
aCtx->PushState();
aCtx->IntersectClip(rects[i]);
nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame,
borderRect, rects[i]);
aCtx->PopState();
}
}
nsRect
nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder) {
return mFrame->GetVisualOverflowRectRelativeToSelf() + ToReferenceFrame();
}
PRBool
nsDisplayBoxShadowOuter::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion)) {
return PR_FALSE;
}
// Store the actual visible region
mVisibleRegion.And(*aVisibleRegion, mVisibleRect);
nsPoint origin = ToReferenceFrame();
nsRect visibleBounds = aVisibleRegion->GetBounds();
nsRect frameRect(origin, mFrame->GetSize());
if (!frameRect.Contains(visibleBounds))
return PR_TRUE;
// the visible region is entirely inside the border-rect, and box shadows
// never render within the border-rect (unless there's a border radius).
nscoord twipsRadii[8];
PRBool hasBorderRadii = mFrame->GetBorderRadii(twipsRadii);
if (!hasBorderRadii)
return PR_FALSE;
return !RoundedRectContainsRect(frameRect, twipsRadii, visibleBounds);
}
void
nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
for (PRUint32 i = 0; i < rects.Length(); ++i) {
aCtx->PushState();
aCtx->IntersectClip(rects[i]);
nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame,
borderRect, rects[i]);
aCtx->PopState();
}
}
PRBool
nsDisplayBoxShadowInner::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion)) {
return PR_FALSE;
}
// Store the actual visible region
mVisibleRegion.And(*aVisibleRegion, mVisibleRect);
return PR_TRUE;
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayItem(aBuilder, aFrame) {
mList.AppendToTop(aList);
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayItem* aItem)
: nsDisplayItem(aBuilder, aFrame) {
mList.AppendToTop(aItem);
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
}
nsDisplayWrapList::~nsDisplayWrapList() {
mList.DeleteAll();
}
void
nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsRect
nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder) {
return mList.GetBounds(aBuilder);
}
PRBool
nsDisplayWrapList::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
return mList.ComputeVisibilityForSublist(aBuilder, aVisibleRegion,
mVisibleRect,
aAllowVisibleRegionExpansion);
}
nsRegion
nsDisplayWrapList::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
PRBool* aForceTransparentSurface) {
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
nsRegion result;
if (mList.IsOpaque()) {
result = GetBounds(aBuilder);
}
return result;
}
PRBool nsDisplayWrapList::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
// We could try to do something but let's conservatively just return PR_FALSE.
return PR_FALSE;
}
PRBool nsDisplayWrapList::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
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,
nsRenderingContext* aCtx) {
NS_ERROR("nsDisplayWrapList should have been flattened away for painting");
}
PRBool nsDisplayWrapList::ChildrenCanBeInactive(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const nsDisplayList& aList,
nsIFrame* aActiveScrolledRoot) {
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
nsIFrame* f = i->GetUnderlyingFrame();
if (f) {
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(f, nsnull);
if (activeScrolledRoot != aActiveScrolledRoot)
return PR_FALSE;
}
LayerState state = i->GetLayerState(aBuilder, aManager);
if (state == LAYER_ACTIVE)
return PR_FALSE;
if (state == LAYER_NONE) {
nsDisplayList* list = i->GetList();
if (list && !ChildrenCanBeInactive(aBuilder, aManager, *list, aActiveScrolledRoot))
return PR_FALSE;
}
}
return PR_TRUE;
}
nsRect nsDisplayWrapList::GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder)
{
nsRect bounds;
for (nsDisplayItem* i = mList.GetBottom(); i; i = i->GetAbove()) {
bounds.UnionRect(bounds, i->GetComponentAlphaBounds(aBuilder));
}
return bounds;
}
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(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayOpacity);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayOpacity::~nsDisplayOpacity() {
MOZ_COUNT_DTOR(nsDisplayOpacity);
}
#endif
nsRegion nsDisplayOpacity::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
PRBool* aForceTransparentSurface) {
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
// We are never opaque, if our opacity was < 1 then we wouldn't have
// been created.
return nsRegion();
}
// nsDisplayOpacity uses layers for rendering
already_AddRefed<Layer>
nsDisplayOpacity::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<Layer> layer = aBuilder->LayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, nsnull);
if (!layer)
return nsnull;
layer->SetOpacity(mFrame->GetStyleDisplay()->mOpacity);
return layer.forget();
}
nsDisplayItem::LayerState
nsDisplayOpacity::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager) {
if (mFrame->AreLayersMarkedActive(nsChangeHint_UpdateOpacityLayer))
return LAYER_ACTIVE;
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(mFrame, nsnull);
return !ChildrenCanBeInactive(aBuilder, aManager, mList, activeScrolledRoot)
? LAYER_ACTIVE : LAYER_INACTIVE;
}
PRBool
nsDisplayOpacity::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
// 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.
nsRect bounds = GetBounds(aBuilder);
nsRegion visibleUnderChildren;
visibleUnderChildren.And(*aVisibleRegion, bounds);
nsRect allowExpansion;
allowExpansion.IntersectRect(bounds, aAllowVisibleRegionExpansion);
return
nsDisplayWrapList::ComputeVisibility(aBuilder, &visibleUnderChildren,
allowExpansion);
}
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<nsDisplayOpacity*>(aItem)->mList);
return PR_TRUE;
}
nsDisplayOwnLayer::nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayOwnLayer);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayOwnLayer::~nsDisplayOwnLayer() {
MOZ_COUNT_DTOR(nsDisplayOwnLayer);
}
#endif
// nsDisplayOpacity uses layers for rendering
already_AddRefed<Layer>
nsDisplayOwnLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<Layer> layer = aBuilder->LayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, nsnull);
return layer.forget();
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame, aList)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame, aItem)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayScrollLayer::~nsDisplayScrollLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollLayer);
}
#endif
already_AddRefed<Layer>
nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<ContainerLayer> layer = aBuilder->LayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, nsnull);
// Get the already set unique ID for scrolling this content remotely.
// Or, if not set, generate a new ID.
nsIContent* content = mScrolledFrame->GetContent();
ViewID scrollId = nsLayoutUtils::FindIDFor(content);
nsRect viewport = mScrollFrame->GetRect() -
mScrollFrame->GetPosition() +
aBuilder->ToReferenceFrame(mScrollFrame);
bool usingDisplayport = false;
nsRect displayport;
if (content) {
usingDisplayport = nsLayoutUtils::GetDisplayPort(content, &displayport);
}
RecordFrameMetrics(mScrolledFrame, mScrollFrame, layer, mVisibleRect, viewport,
(usingDisplayport ? &displayport : nsnull), scrollId,
aContainerParameters);
return layer.forget();
}
PRBool
nsDisplayScrollLayer::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
nsRect displayport;
if (nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport)) {
// The visible region for the children may be much bigger than the hole we
// are viewing the children from, so that the compositor process has enough
// content to asynchronously pan while content is being refreshed.
nsRegion childVisibleRegion = displayport + aBuilder->ToReferenceFrame(mScrollFrame);
nsRect boundedRect;
boundedRect.IntersectRect(childVisibleRegion.GetBounds(), mList.GetBounds(aBuilder));
nsRect allowExpansion;
allowExpansion.IntersectRect(allowExpansion, boundedRect);
PRBool visible = mList.ComputeVisibilityForSublist(
aBuilder, &childVisibleRegion, boundedRect, allowExpansion);
mVisibleRect = boundedRect;
return visible;
} else {
return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion);
}
}
LayerState
nsDisplayScrollLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager)
{
// Force this as a layer so we can scroll asynchronously.
// This causes incorrect rendering for rounded clips!
return LAYER_ACTIVE_FORCE;
}
PRBool
nsDisplayScrollLayer::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
if (aItem->GetType() != TYPE_SCROLL_LAYER) {
return PR_FALSE;
}
nsDisplayScrollLayer* other = static_cast<nsDisplayScrollLayer*>(aItem);
if (other->mScrolledFrame != this->mScrolledFrame) {
return PR_FALSE;
}
FrameProperties props = mScrolledFrame->Properties();
props.Set(nsIFrame::ScrollLayerCount(),
reinterpret_cast<void*>(GetScrollLayerCount() - 1));
mList.AppendToBottom(&other->mList);
return PR_TRUE;
}
PRBool
nsDisplayScrollLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
return GetScrollLayerCount() > 1;
}
PRWord
nsDisplayScrollLayer::GetScrollLayerCount()
{
FrameProperties props = mScrolledFrame->Properties();
#ifdef DEBUG
PRBool hasCount = PR_FALSE;
PRWord result = reinterpret_cast<PRWord>(
props.Get(nsIFrame::ScrollLayerCount(), &hasCount));
// If this aborts, then the property was either not added before scroll
// layers were created or the property was deleted to early. If the latter,
// make sure that nsDisplayScrollInfoLayer is on the bottom of the list so
// that it is processed last.
NS_ABORT_IF_FALSE(hasCount, "nsDisplayScrollLayer should always be defined");
return result;
#else
return reinterpret_cast<PRWord>(props.Get(nsIFrame::ScrollLayerCount()));
#endif
}
PRWord
nsDisplayScrollLayer::RemoveScrollLayerCount()
{
PRWord result = GetScrollLayerCount();
FrameProperties props = mScrolledFrame->Properties();
props.Remove(nsIFrame::ScrollLayerCount());
return result;
}
nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
nsDisplayListBuilder* aBuilder,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayScrollLayer(aBuilder, aScrolledFrame, aScrolledFrame, aScrollFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
#endif
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer);
}
#endif
LayerState
nsDisplayScrollInfoLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager)
{
return LAYER_ACTIVE_EMPTY;
}
PRBool
nsDisplayScrollInfoLayer::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
return PR_FALSE;
}
PRBool
nsDisplayScrollInfoLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
// Layer metadata for a particular scroll frame needs to be unique. Only
// one nsDisplayScrollLayer (with rendered content) or one
// nsDisplayScrollInfoLayer (with only the metadata) should survive the
// visibility computation.
return RemoveScrollLayerCount() == 1;
}
nsDisplayClip::nsDisplayClip(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayItem* aItem,
const nsRect& aRect)
: nsDisplayWrapList(aBuilder, aFrame, aItem) {
MOZ_COUNT_CTOR(nsDisplayClip);
mClip = SnapBounds(aBuilder->IsSnappingEnabled() && !aBuilder->IsInTransform(),
aBuilder->CurrentPresContext(), aRect);
}
nsDisplayClip::nsDisplayClip(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const nsRect& aRect)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayClip);
mClip = SnapBounds(aBuilder->IsSnappingEnabled() && !aBuilder->IsInTransform(),
aBuilder->CurrentPresContext(), aRect);
}
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,
nsRenderingContext* aCtx) {
NS_ERROR("nsDisplayClip should have been flattened away for painting");
}
PRBool nsDisplayClip::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
nsRegion clipped;
clipped.And(*aVisibleRegion, mClip);
nsRegion finalClipped(clipped);
nsRect allowExpansion;
allowExpansion.IntersectRect(mClip, aAllowVisibleRegionExpansion);
PRBool anyVisible =
nsDisplayWrapList::ComputeVisibility(aBuilder, &finalClipped,
allowExpansion);
nsRegion removed;
removed.Sub(clipped, finalClipped);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
return anyVisible;
}
PRBool nsDisplayClip::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_CLIP)
return PR_FALSE;
nsDisplayClip* other = static_cast<nsDisplayClip*>(aItem);
if (!other->mClip.IsEqualInterior(mClip))
return PR_FALSE;
mList.AppendToBottom(&other->mList);
return PR_TRUE;
}
nsDisplayWrapList* nsDisplayClip::WrapWithClone(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem) {
return new (aBuilder)
nsDisplayClip(aBuilder, aItem->GetUnderlyingFrame(), aItem, mClip);
}
nsDisplayClipRoundedRect::nsDisplayClipRoundedRect(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayItem* aItem,
const nsRect& aRect, nscoord aRadii[8])
: nsDisplayClip(aBuilder, aFrame, aItem, aRect)
{
MOZ_COUNT_CTOR(nsDisplayClipRoundedRect);
memcpy(mRadii, aRadii, sizeof(mRadii));
}
nsDisplayClipRoundedRect::nsDisplayClipRoundedRect(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayList* aList,
const nsRect& aRect, nscoord aRadii[8])
: nsDisplayClip(aBuilder, aFrame, aList, aRect)
{
MOZ_COUNT_CTOR(nsDisplayClipRoundedRect);
memcpy(mRadii, aRadii, sizeof(mRadii));
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayClipRoundedRect::~nsDisplayClipRoundedRect()
{
MOZ_COUNT_DTOR(nsDisplayClipRoundedRect);
}
#endif
nsRegion
nsDisplayClipRoundedRect::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
PRBool* aForceTransparentSurface)
{
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
return nsRegion();
}
void
nsDisplayClipRoundedRect::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (!RoundedRectIntersectsRect(mClip, mRadii, aRect)) {
// aRect doesn't intersect our border-radius curve.
// FIXME: This isn't quite sufficient for aRect having nontrivial
// size (which is the unusual case here), since it's possible that
// the part of aRect that intersects the the rounded rect isn't the
// part that intersects the items in mList.
return;
}
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsDisplayWrapList*
nsDisplayClipRoundedRect::WrapWithClone(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem) {
return new (aBuilder)
nsDisplayClipRoundedRect(aBuilder, aItem->GetUnderlyingFrame(), aItem,
mClip, mRadii);
}
PRBool nsDisplayClipRoundedRect::ComputeVisibility(
nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
nsRegion clipped;
clipped.And(*aVisibleRegion, mClip);
return nsDisplayWrapList::ComputeVisibility(aBuilder, &clipped, nsRect());
// FIXME: Remove a *conservative* opaque region from aVisibleRegion
// (like in nsDisplayClip::ComputeVisibility).
}
PRBool nsDisplayClipRoundedRect::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
{
if (aItem->GetType() != TYPE_CLIP_ROUNDED_RECT)
return PR_FALSE;
nsDisplayClipRoundedRect* other =
static_cast<nsDisplayClipRoundedRect*>(aItem);
if (!mClip.IsEqualInterior(other->mClip) ||
memcmp(mRadii, other->mRadii, sizeof(mRadii)) != 0)
return PR_FALSE;
mList.AppendToBottom(&other->mList);
return PR_TRUE;
}
nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
PRInt32 aAPD, PRInt32 aParentAPD)
: nsDisplayOwnLayer(aBuilder, aFrame, aList), mAPD(aAPD),
mParentAPD(aParentAPD) {
MOZ_COUNT_CTOR(nsDisplayZoom);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayZoom::~nsDisplayZoom() {
MOZ_COUNT_DTOR(nsDisplayZoom);
}
#endif
nsRect nsDisplayZoom::GetBounds(nsDisplayListBuilder* aBuilder)
{
nsRect bounds = nsDisplayWrapList::GetBounds(aBuilder);
return bounds.ConvertAppUnitsRoundOut(mAPD, mParentAPD);
}
void nsDisplayZoom::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
nsRect rect;
// A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1
// rect as well instead of possibly rounding the width or height to zero.
if (aRect.width == 1 && aRect.height == 1) {
rect.MoveTo(aRect.TopLeft().ConvertAppUnits(mParentAPD, mAPD));
rect.width = rect.height = 1;
} else {
rect = aRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
}
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
void nsDisplayZoom::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
mList.PaintForFrame(aBuilder, aCtx, mFrame, nsDisplayList::PAINT_DEFAULT);
}
PRBool nsDisplayZoom::ComputeVisibility(nsDisplayListBuilder *aBuilder,
nsRegion *aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
// Convert the passed in visible region to our appunits.
nsRegion visibleRegion =
aVisibleRegion->ConvertAppUnitsRoundOut(mParentAPD, mAPD);
nsRegion originalVisibleRegion = visibleRegion;
nsRect transformedVisibleRect =
mVisibleRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
nsRect allowExpansion =
aAllowVisibleRegionExpansion.ConvertAppUnitsRoundIn(mParentAPD, mAPD);
PRBool retval =
mList.ComputeVisibilityForSublist(aBuilder, &visibleRegion,
transformedVisibleRect,
allowExpansion);
nsRegion removed;
// removed = originalVisibleRegion - visibleRegion
removed.Sub(originalVisibleRegion, visibleRegion);
// Convert removed region to parent appunits.
removed = removed.ConvertAppUnitsRoundIn(mAPD, mParentAPD);
// aVisibleRegion = aVisibleRegion - removed (modulo any simplifications
// SubtractFromVisibleRegion does)
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
return retval;
}
///////////////////////////////////////////////////
// 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 reflowed, 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 <span> 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-transform-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
gfxPoint3D 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. */
gfxPoint3D result;
gfxFloat* coords[3] = {&result.x, &result.y, &result.z};
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.
*/
const nsStyleCoord &coord = display->mTransformOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
*coords[index] = NSAppUnitsToFloatPixels(*dimensions[index], aFactor) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aFactor);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
*coords[index] = NSAppUnitsToFloatPixels(*dimensions[index], aFactor) *
coord.GetPercentValue();
} else {
NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
*coords[index] = NSAppUnitsToFloatPixels(coord.GetCoordValue(), aFactor);
}
}
*coords[2] = NSAppUnitsToFloatPixels(display->mTransformOrigin[2].GetCoordValue(), aFactor);
/* Adjust based on the origin of the rectangle. */
result.x += NSAppUnitsToFloatPixels(boundingRect.x, aFactor);
result.y += NSAppUnitsToFloatPixels(boundingRect.y, aFactor);
return result;
}
/* Returns the delta specified by the -moz-perspective-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 perspective origin.
*/
static
gfxPoint3D GetDeltaToMozPerspectiveOrigin(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-perspective-origin is a
* percentage, it's relative to the size of the frame. Otherwise, if it's
* a distance, it's already computed for us!
*/
//TODO: Should this be using our bounds or the parent's bounds?
// How do we handle aBoundsOverride in the latter case?
const nsStyleDisplay* display = aFrame->GetParent()->GetStyleDisplay();
nsRect boundingRect = (aBoundsOverride ? *aBoundsOverride :
nsDisplayTransform::GetFrameBoundsForTransform(aFrame));
/* Allows us to access named variables by index. */
gfxPoint3D result;
result.z = 0.0f;
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.
*/
const nsStyleCoord &coord = display->mPerspectiveOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
*coords[index] = NSAppUnitsToFloatPixels(*dimensions[index], aFactor) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aFactor);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
*coords[index] = NSAppUnitsToFloatPixels(*dimensions[index], aFactor) *
coord.GetPercentValue();
} else {
NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
*coords[index] = NSAppUnitsToFloatPixels(coord.GetCoordValue(), aFactor);
}
}
/**
* An offset of (0,0) results in the perspective-origin being at the centre of the element,
* so include a shift of the centre point to (0,0).
*/
result.x -= NSAppUnitsToFloatPixels(boundingRect.width, aFactor)/2;
result.y -= NSAppUnitsToFloatPixels(boundingRect.height, aFactor)/2;
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.
*/
gfx3DMatrix
nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame,
const nsPoint &aOrigin,
float aFactor,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor)
{
NS_PRECONDITION(aFrame, "Cannot get transform matrix for a null frame!");
if (aOutAncestor) {
*aOutAncestor = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
}
/* Preserve-3d can cause frames without a transform to get an nsDisplayTransform created, we should
* use our parent's transform here.
*/
if (!aFrame->GetStyleDisplay()->HasTransform()) {
return GetResultingTransformMatrix(aFrame->GetParent(), aOrigin - aFrame->GetPosition(), aFactor, nsnull, aOutAncestor);
}
/* Account for the -moz-transform-origin property by translating the
* coordinate space to the new origin.
*/
gfxPoint3D toMozOrigin = GetDeltaToMozTransformOrigin(aFrame, aFactor, aBoundsOverride);
gfxPoint3D toPerspectiveOrigin = GetDeltaToMozPerspectiveOrigin(aFrame, aFactor, aBoundsOverride);
gfxPoint3D newOrigin = gfxPoint3D(NSAppUnitsToFloatPixels(aOrigin.x, aFactor),
NSAppUnitsToFloatPixels(aOrigin.y, aFactor),
0.0f);
/* 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. */
PRBool dummy;
gfx3DMatrix result;
/* Transformed frames always have a transform, or are preserving 3d (and might still have perspective!) */
if (disp->mSpecifiedTransform) {
result = nsStyleTransformMatrix::ReadTransforms(disp->mSpecifiedTransform,
aFrame->GetStyleContext(),
aFrame->PresContext(),
dummy, bounds, aFactor);
} else {
NS_ASSERTION(aFrame->GetStyleDisplay()->mTransformStyle == NS_STYLE_TRANSFORM_STYLE_PRESERVE_3D,
"If we don't have a transform, then we must be at least attempting to preserve the transforms of our children");
}
const nsStyleDisplay* parentDisp = nsnull;
if (aFrame->GetParent()) {
parentDisp = aFrame->GetParent()->GetStyleDisplay();
}
if (nsLayoutUtils::Are3DTransformsEnabled() &&
parentDisp && parentDisp->mChildPerspective.GetUnit() == eStyleUnit_Coord &&
parentDisp->mChildPerspective.GetCoordValue() > 0.0) {
gfx3DMatrix perspective;
perspective._34 =
-1.0 / NSAppUnitsToFloatPixels(parentDisp->mChildPerspective.GetCoordValue(),
aFactor);
result = result * nsLayoutUtils::ChangeMatrixBasis(toPerspectiveOrigin, perspective);
}
if (aFrame->Preserves3D() && nsLayoutUtils::Are3DTransformsEnabled()) {
// Include the transform set on our parent
NS_ASSERTION(aFrame->GetParent() &&
aFrame->GetParent()->IsTransformed() &&
aFrame->GetParent()->Preserves3DChildren(),
"Preserve3D mismatch!");
gfx3DMatrix parent = GetResultingTransformMatrix(aFrame->GetParent(), aOrigin - aFrame->GetPosition(),
aFactor, nsnull, aOutAncestor);
return nsLayoutUtils::ChangeMatrixBasis(newOrigin + toMozOrigin, result) * parent;
}
return nsLayoutUtils::ChangeMatrixBasis
(newOrigin + toMozOrigin, result);
}
const gfx3DMatrix&
nsDisplayTransform::GetTransform(float aFactor)
{
if (mTransform.IsIdentity() || mCachedFactor != aFactor) {
mTransform =
GetResultingTransformMatrix(mFrame, ToReferenceFrame(),
aFactor,
nsnull);
mCachedFactor = aFactor;
}
return mTransform;
}
already_AddRefed<Layer> nsDisplayTransform::BuildLayer(nsDisplayListBuilder *aBuilder,
LayerManager *aManager,
const ContainerParameters& aContainerParameters)
{
const gfx3DMatrix& newTransformMatrix =
GetTransform(mFrame->PresContext()->AppUnitsPerDevPixel());
if (newTransformMatrix.IsSingular() ||
(mFrame->GetStyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN &&
newTransformMatrix.GetNormalVector().z <= 0.0)) {
return nsnull;
}
return aBuilder->LayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, *mStoredList.GetList(),
aContainerParameters, &newTransformMatrix);
}
nsDisplayItem::LayerState
nsDisplayTransform::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager) {
if (mFrame->AreLayersMarkedActive(nsChangeHint_UpdateTransformLayer))
return LAYER_ACTIVE;
if (!GetTransform(mFrame->PresContext()->AppUnitsPerDevPixel()).Is2D())
return LAYER_ACTIVE;
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(mFrame, nsnull);
return !mStoredList.ChildrenCanBeInactive(aBuilder,
aManager,
*mStoredList.GetList(),
activeScrolledRoot)
? LAYER_ACTIVE : LAYER_INACTIVE;
}
PRBool nsDisplayTransform::ComputeVisibility(nsDisplayListBuilder *aBuilder,
nsRegion *aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
/* As we do this, we need to be sure to
* untransform the visible rect, since we want everything that's painting to
* think that it's painting in its original rectangular coordinate space.
* If we can't untransform, take the entire overflow rect */
nsRect untransformedVisibleRect;
if (!UntransformRect(mVisibleRect,
mFrame,
aBuilder->ToReferenceFrame(mFrame),
&untransformedVisibleRect))
{
untransformedVisibleRect = mFrame->GetVisualOverflowRectRelativeToSelf() +
aBuilder->ToReferenceFrame(mFrame);
}
nsRegion untransformedVisible = untransformedVisibleRect;
// Call RecomputeVisiblity instead of ComputeVisibility since
// nsDisplayItem::ComputeVisibility should only be called from
// nsDisplayList::ComputeVisibility (which sets mVisibleRect on the item)
mStoredList.RecomputeVisibility(aBuilder, &untransformedVisible);
return PR_TRUE;
}
#ifdef DEBUG_HIT
#include <time.h>
#endif
/* HitTest does some fun stuff with matrix transforms to obtain the answer. */
void nsDisplayTransform::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
/* 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 rect into the correct space.
* 4. Pass that rect down through to the list's version of HitTest.
*/
float factor = nsPresContext::AppUnitsPerCSSPixel();
gfx3DMatrix matrix = GetTransform(factor);
/* If the matrix is singular, or a hidden backface is shown, we didn't hit anything. */
if (matrix.IsSingular() ||
(mFrame->GetStyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN &&
matrix.GetNormalVector().z <= 0.0)) {
return;
}
/* 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)
*/
/* Now, apply the transform and pass it down the channel. */
nsRect resultingRect;
if (aRect.width == 1 && aRect.height == 1) {
// Magic width/height indicating we're hit testing a point, not a rect
gfxPoint point = matrix.Inverse().ProjectPoint(
gfxPoint(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor)));
resultingRect = nsRect(NSFloatPixelsToAppUnits(float(point.x), factor),
NSFloatPixelsToAppUnits(float(point.y), factor),
1, 1);
} else {
gfxRect originalRect(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor),
NSAppUnitsToFloatPixels(aRect.width, factor),
NSAppUnitsToFloatPixels(aRect.height, factor));
gfxRect rect = matrix.Inverse().ProjectRectBounds(originalRect);;
resultingRect = nsRect(NSFloatPixelsToAppUnits(float(rect.X()), factor),
NSFloatPixelsToAppUnits(float(rect.Y()), factor),
NSFloatPixelsToAppUnits(float(rect.Width()), factor),
NSFloatPixelsToAppUnits(float(rect.Height()), factor));
}
#ifdef DEBUG_HIT
printf("Frame: %p\n", dynamic_cast<void *>(mFrame));
printf(" Untransformed point: (%f, %f)\n", resultingRect.X(), resultingRect.Y());
PRUint32 originalFrameCount = aOutFrames.Length();
#endif
mStoredList.HitTest(aBuilder, resultingRect, aState, aOutFrames);
#ifdef DEBUG_HIT
if (originalFrameCount != aOutFrames.Length())
printf(" Hit! Time: %f, first frame: %p\n", static_cast<double>(clock()),
dynamic_cast<void *>(aOutFrames.ElementAt(0)));
printf("=== end of hit test ===\n");
#endif
}
/* The bounding rectangle for the object is the overflow rectangle translated
* by the reference point.
*/
nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder *aBuilder)
{
return TransformRect(mStoredList.GetBounds(aBuilder), mFrame, ToReferenceFrame());
}
/* The transform is opaque iff the transform consists solely of scales and
* translations 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.
*
* We also need to check whether the underlying opaque content completely fills
* our visible rect. We use UntransformRect which expands to the axis-aligned
* bounding rect, but that's OK since if
* mStoredList.GetVisibleRect().Contains(untransformedVisible), then it
* certainly contains the actual (non-axis-aligned) untransformed rect.
*/
nsRegion nsDisplayTransform::GetOpaqueRegion(nsDisplayListBuilder *aBuilder,
PRBool* aForceTransparentSurface)
{
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
nsRect untransformedVisible;
if (!UntransformRect(mVisibleRect, mFrame, ToReferenceFrame(), &untransformedVisible)) {
return nsRegion();
}
const gfx3DMatrix& matrix = GetTransform(nsPresContext::AppUnitsPerCSSPixel());
nsRegion result;
gfxMatrix matrix2d;
if (matrix.Is2D(&matrix2d) &&
matrix2d.PreservesAxisAlignedRectangles() &&
mStoredList.GetOpaqueRegion(aBuilder).Contains(untransformedVisible)) {
result = mVisibleRect;
}
return result;
}
/* The transform is uniform if it fills the entire bounding rect and the
* wrapped list is uniform. See GetOpaqueRegion for discussion of why this
* works.
*/
PRBool nsDisplayTransform::IsUniform(nsDisplayListBuilder *aBuilder, nscolor* aColor)
{
nsRect untransformedVisible;
if (!UntransformRect(mVisibleRect, mFrame, ToReferenceFrame(), &untransformedVisible)) {
return PR_FALSE;
}
const gfx3DMatrix& matrix = GetTransform(nsPresContext::AppUnitsPerCSSPixel());
gfxMatrix matrix2d;
return matrix.Is2D(&matrix2d) &&
matrix2d.PreservesAxisAlignedRectangles() &&
mStoredList.GetVisibleRect().Contains(untransformedVisible) &&
mStoredList.IsUniform(aBuilder, aColor);
}
/* 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<nsDisplayTransform *>(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!");
float factor = nsPresContext::AppUnitsPerCSSPixel();
return nsLayoutUtils::MatrixTransformRect
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride),
factor);
}
nsRect nsDisplayTransform::TransformRectOut(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!");
float factor = nsPresContext::AppUnitsPerCSSPixel();
return nsLayoutUtils::MatrixTransformRectOut
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride),
factor);
}
PRBool nsDisplayTransform::UntransformRect(const nsRect &aUntransformedBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
nsRect* aOutRect)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
/* Grab the matrix. If the transform is degenerate, just hand back the
* empty rect.
*/
float factor = nsPresContext::AppUnitsPerCSSPixel();
gfx3DMatrix matrix = GetResultingTransformMatrix(aFrame, aOrigin, factor, nsnull);
if (matrix.IsSingular())
return PR_FALSE;
gfxRect result(NSAppUnitsToFloatPixels(aUntransformedBounds.x, factor),
NSAppUnitsToFloatPixels(aUntransformedBounds.y, factor),
NSAppUnitsToFloatPixels(aUntransformedBounds.width, factor),
NSAppUnitsToFloatPixels(aUntransformedBounds.height, factor));
/* We want to untransform the matrix, so invert the transformation first! */
result = matrix.Inverse().ProjectRectBounds(result);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(result, factor);
return PR_TRUE;
}
nsDisplaySVGEffects::nsDisplaySVGEffects(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList), mEffectsFrame(aFrame),
mBounds(aFrame->GetVisualOverflowRectRelativeToSelf())
{
MOZ_COUNT_CTOR(nsDisplaySVGEffects);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplaySVGEffects::~nsDisplaySVGEffects()
{
MOZ_COUNT_DTOR(nsDisplaySVGEffects);
}
#endif
nsRegion nsDisplaySVGEffects::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
PRBool* aForceTransparentSurface)
{
if (aForceTransparentSurface) {
*aForceTransparentSurface = PR_FALSE;
}
return nsRegion();
}
void
nsDisplaySVGEffects::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2);
if (nsSVGIntegrationUtils::HitTestFrameForEffects(mEffectsFrame,
rectCenter - aBuilder->ToReferenceFrame(mEffectsFrame))) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
}
void nsDisplaySVGEffects::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsSVGIntegrationUtils::PaintFramesWithEffects(aCtx,
mEffectsFrame, mVisibleRect, aBuilder, &mList);
}
PRBool nsDisplaySVGEffects::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion) {
nsPoint offset = aBuilder->ToReferenceFrame(mEffectsFrame);
nsRect dirtyRect =
nsSVGIntegrationUtils::GetRequiredSourceForInvalidArea(mEffectsFrame,
mVisibleRect - offset) +
offset;
// Our children may be made translucent or arbitrarily deformed so we should
// not allow them to subtract area from aVisibleRegion.
nsRegion childrenVisible(dirtyRect);
nsRect r;
r.IntersectRect(dirtyRect, mList.GetBounds(aBuilder));
mList.ComputeVisibilityForSublist(aBuilder, &childrenVisible, r, nsRect());
return PR_TRUE;
}
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<nsDisplaySVGEffects*>(aItem);
mList.AppendToBottom(&other->mList);
mBounds.UnionRect(mBounds,
other->mBounds + other->mEffectsFrame->GetOffsetTo(mEffectsFrame));
return PR_TRUE;
}
nsDisplayForcePaintOnScroll::nsDisplayForcePaintOnScroll(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayForcePaintOnScroll);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayForcePaintOnScroll::~nsDisplayForcePaintOnScroll() {
MOZ_COUNT_DTOR(nsDisplayForcePaintOnScroll);
}
#endif
PRBool nsDisplayForcePaintOnScroll::IsVaryingRelativeToMovingFrame(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
return PR_TRUE;
}
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