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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 "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
#include "nsLayoutUtils.h"
#include "imgIContainer.h"
#include "nsIInterfaceRequestorUtils.h"
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
PRBool aIsForEvents, PRBool aBuildCaret)
: mReferenceFrame(aReferenceFrame),
mMovingFrame(nsnull),
mSaveVisibleRegionOfMovingContent(nsnull),
mIgnoreScrollFrame(nsnull),
mCurrentTableItem(nsnull),
mBuildCaret(aBuildCaret),
mEventDelivery(aIsForEvents),
mIsAtRootOfPseudoStackingContext(PR_FALSE),
mPaintAllFrames(PR_FALSE),
mAccurateVisibleRegions(PR_FALSE),
mInTransform(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<nsISelectionController> 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<nsRect*>(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);
}
void
nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
const nsRegion& aRegion)
{
aVisibleRegion->Sub(*aVisibleRegion, aRegion);
if (!GetAccurateVisibleRegions()) {
aVisibleRegion->SimplifyOutward(15);
}
}
PRBool
nsDisplayListBuilder::IsMovingFrame(nsIFrame* aFrame)
{
return mMovingFrame &&
nsLayoutUtils::IsAncestorFrameCrossDoc(mMovingFrame, aFrame, mReferenceFrame);
}
nsCaret *
nsDisplayListBuilder::GetCaret() {
nsRefPtr<nsCaret> 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();
state->mPresShell->UpdateCanvasBackground();
if (!mBuildCaret)
return;
nsRefPtr<nsCaret> 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,
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
nsDisplayListBuilder::AccumulateVisibleRegionOfMovingContent(const nsRegion& aMovingContent,
const nsRegion& aVisibleRegion)
{
if (!mSaveVisibleRegionOfMovingContent)
return;
// Grab the union of aMovingContent (after the move) with
// aMovingContent - mMoveDelta (before the move)
nsRegion r = aMovingContent;
r.MoveBy(-mMoveDelta);
r.Or(r, aMovingContent);
// Reduce to the part that's visible after the move
r.And(r, aVisibleRegion);
// Accumulate it into our result
mSaveVisibleRegionOfMovingContent->Or(
*mSaveVisibleRegionOfMovingContent, r);
mSaveVisibleRegionOfMovingContent->SimplifyOutward(15);
}
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");
if (IsOpaque(aBuilder)) {
nsRect opaqueArea = bounds;
if (aBuilder->IsMovingFrame(f)) {
// 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 area that was opaque in the
// before state and in the after state.
opaqueArea.IntersectRect(bounds - aBuilder->GetMoveDelta(), bounds);
}
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, nsRegion(opaqueArea));
}
return PR_TRUE;
}
void
nsDisplayList::FlattenTo(nsTArray<nsDisplayItem*>* 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<nsDisplayItem*, 512> elements;
FlattenTo(&elements);
// Accumulate the bounds of all moving content we find in this list
nsRect movingContentAccumulatedBounds;
// Store an overapproximation of the visible region for the moving
// content in this list
nsRegion movingContentVisibleRegion;
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;
}
nsIFrame* f = item->GetUnderlyingFrame();
if (f && aBuilder->IsMovingFrame(f)) {
if (movingContentAccumulatedBounds.IsEmpty()) {
// *aVisibleRegion can only shrink during this loop, so storing
// the first one we see is a sound overapproximation
movingContentVisibleRegion = *aVisibleRegion;
}
movingContentAccumulatedBounds.UnionRect(movingContentAccumulatedBounds,
item->GetBounds(aBuilder));
}
if (item->OptimizeVisibility(aBuilder, aVisibleRegion)) {
AppendToBottom(item);
} else {
item->~nsDisplayItem();
}
}
aBuilder->AccumulateVisibleRegionOfMovingContent(
nsRegion(movingContentAccumulatedBounds), movingContentVisibleRegion);
}
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<nsIContent*>(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<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::Sort(nsDisplayListBuilder* aBuilder,
SortLEQ aCmp, void* aClosure) {
ExplodeAnonymousChildLists(aBuilder);
::Sort(this, Count(), aCmp, aClosure);
}
void nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect) {
nsRect dirty;
dirty.IntersectRect(GetBounds(aBuilder), aDirtyRect);
aCtx->SetColor(mColor);
aCtx->FillRect(dirty);
}
// 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.
static PRBool RoundedRectContainsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect) {
// rectFullHeight and rectFullWidth together will approximately contain
// the total area of the frame minus the rounded corners.
nsRect rectFullHeight = aRoundedRect;
nscoord xDiff = PR_MAX(aRadii[NS_CORNER_TOP_LEFT_X], aRadii[NS_CORNER_BOTTOM_LEFT_X]);
rectFullHeight.x += xDiff;
rectFullHeight.width -= PR_MAX(aRadii[NS_CORNER_TOP_RIGHT_X],
aRadii[NS_CORNER_BOTTOM_RIGHT_X]) + xDiff;
if (rectFullHeight.Contains(aContainedRect))
return PR_TRUE;
nsRect rectFullWidth = aRoundedRect;
nscoord yDiff = PR_MAX(aRadii[NS_CORNER_TOP_LEFT_Y], aRadii[NS_CORNER_TOP_RIGHT_Y]);
rectFullWidth.y += yDiff;
rectFullWidth.height -= PR_MAX(aRadii[NS_CORNER_BOTTOM_LEFT_Y],
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) + yDiff;
if (rectFullWidth.Contains(aContainedRect))
return PR_TRUE;
return PR_FALSE;
}
PRBool
nsDisplayBackground::IsOpaque(nsDisplayListBuilder* aBuilder) {
// theme background overrides any other background
if (mIsThemed)
return PR_FALSE;
const nsStyleBackground* bg;
if (!nsCSSRendering::FindBackground(mFrame->PresContext(), mFrame, &bg))
return PR_FALSE;
const nsStyleBackground::Layer& bottomLayer = bg->BottomLayer();
// bottom layer's clip is used for the color
if (bottomLayer.mClip != NS_STYLE_BG_CLIP_BORDER ||
nsLayoutUtils::HasNonZeroCorner(mFrame->GetStyleBorder()->mBorderRadius))
return PR_FALSE;
if (NS_GET_A(bg->mBackgroundColor) == 255 &&
!nsCSSRendering::IsCanvasFrame(mFrame))
return PR_TRUE;
if (bottomLayer.mRepeat == NS_STYLE_BG_REPEAT_XY) {
if (bottomLayer.mImage.GetType() == eBackgroundImage_Image) {
nsCOMPtr<imgIContainer> container;
bottomLayer.mImage.GetImageData()->GetImage(getter_AddRefs(container));
if (container) {
PRBool animated;
container->GetAnimated(&animated);
if (!animated) {
PRBool isOpaque;
if (NS_SUCCEEDED(container->GetCurrentFrameIsOpaque(&isOpaque)))
return isOpaque;
}
}
}
}
return PR_FALSE;
}
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.GetType() == eBackgroundImage_Null &&
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);
PRUint32 flags = 0;
nsDisplayItem* nextItem = GetAbove();
if (nextItem && nextItem->GetUnderlyingFrame() == mFrame &&
nextItem->GetType() == TYPE_BORDER) {
flags |= nsCSSRendering::PAINT_WILL_PAINT_BORDER;
}
nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame,
aDirtyRect, nsRect(offset, mFrame->GetSize()),
flags);
}
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;
nsPoint origin = aBuilder->ToReferenceFrame(mFrame);
nsRect frameRect(origin, mFrame->GetSize());
const nsRect visibleBounds = aVisibleRegion->GetBounds();
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 =
nsCSSRendering::GetBorderRadiusTwips(mFrame->GetStyleBorder()->mBorderRadius,
frameRect.width,
twipsRadii);
if (!hasBorderRadii)
return PR_FALSE;
return !RoundedRectContainsRect(frameRect, twipsRadii, visibleBounds);
}
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() && !aBuilder->HasMovingFrames())
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<nsIDeviceContext> 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<nsDisplayOpacity*>(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);
if (aBuilder->HasMovingFrames() &&
!aBuilder->IsMovingFrame(mClippingFrame)) {
// There may be some clipped moving children that were visible before
// but are clipped out now. Conservatively assume they were there
// and add their possible area to the visible region of moving
// content.
// Compute the after-move region of moving content that could have been
// totally clipped out.
nsRegion r;
r.Sub(mClip + aBuilder->GetMoveDelta(), mClip);
aBuilder->AccumulateVisibleRegionOfMovingContent(r, *aVisibleRegion);
}
nsRegion rNew(clipped);
PRBool anyVisible = nsDisplayWrapList::OptimizeVisibility(aBuilder, &rNew);
nsRegion subtracted;
subtracted.Sub(clipped, rNew);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, subtracted);
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 != 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 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-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 <time.h>
#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<void *>(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<double>(clock()),
dynamic_cast<void *>(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<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!");
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<nsDisplaySVGEffects*>(aItem);
mList.AppendToBottom(&other->mList);
mBounds.UnionRect(mBounds,
other->mBounds + other->mEffectsFrame->GetOffsetTo(mEffectsFrame));
return PR_TRUE;
}
#endif
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