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gecko-dev/layout/generic/nsCanvasFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* rendering object that goes directly inside the document's scrollbars */
#include "nsCanvasFrame.h"
#include "AccessibleCaretEventHub.h"
#include "gfxUtils.h"
#include "nsContainerFrame.h"
#include "nsCSSRendering.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsIFrameInlines.h"
#include "nsIPresShell.h"
#include "nsDisplayList.h"
#include "nsCSSFrameConstructor.h"
#include "nsFrameManager.h"
#include "gfxPlatform.h"
#include "nsPrintfCString.h"
#include "mozilla/dom/AnonymousContent.h"
#include "mozilla/PresShell.h"
// for focus
#include "nsIScrollableFrame.h"
#ifdef DEBUG_CANVAS_FOCUS
#include "nsIDocShell.h"
#endif
//#define DEBUG_CANVAS_FOCUS
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::layout;
using namespace mozilla::gfx;
using namespace mozilla::layers;
nsCanvasFrame*
NS_NewCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsCanvasFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsCanvasFrame)
NS_QUERYFRAME_HEAD(nsCanvasFrame)
NS_QUERYFRAME_ENTRY(nsCanvasFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
void
nsCanvasFrame::ShowCustomContentContainer()
{
if (mCustomContentContainer) {
mCustomContentContainer->UnsetAttr(kNameSpaceID_None, nsGkAtoms::hidden, true);
}
}
void
nsCanvasFrame::HideCustomContentContainer()
{
if (mCustomContentContainer) {
mCustomContentContainer->SetAttr(kNameSpaceID_None, nsGkAtoms::hidden,
NS_LITERAL_STRING("true"),
true);
}
}
nsresult
nsCanvasFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
{
if (!mContent) {
return NS_OK;
}
nsCOMPtr<nsIDocument> doc = mContent->OwnerDoc();
nsresult rv = NS_OK;
// Create the custom content container.
mCustomContentContainer = doc->CreateHTMLElement(nsGkAtoms::div);
#ifdef DEBUG
// We restyle our mCustomContentContainer, even though it's root anonymous
// content. Normally that's not OK because the frame constructor doesn't know
// how to order the frame tree in such cases, but we make this work for this
// particular case, so it's OK.
mCustomContentContainer->SetProperty(nsGkAtoms::restylableAnonymousNode,
reinterpret_cast<void*>(true));
#endif // DEBUG
aElements.AppendElement(mCustomContentContainer);
// XXX add :moz-native-anonymous or will that be automatically set?
rv = mCustomContentContainer->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("moz-custom-content-container"),
true);
NS_ENSURE_SUCCESS(rv, rv);
// Append all existing AnonymousContent nodes stored at document level if any.
size_t len = doc->GetAnonymousContents().Length();
for (size_t i = 0; i < len; ++i) {
nsCOMPtr<Element> node = doc->GetAnonymousContents()[i]->GetContentNode();
mCustomContentContainer->AppendChildTo(node->AsContent(), true);
}
// Only create a frame for mCustomContentContainer if it has some children.
if (len == 0) {
HideCustomContentContainer();
}
RefPtr<AccessibleCaretEventHub> eventHub =
PresContext()->GetPresShell()->GetAccessibleCaretEventHub();
if (eventHub) {
// AccessibleCaret will insert anonymous caret elements.
eventHub->Init();
}
return NS_OK;
}
void
nsCanvasFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, uint32_t aFilter)
{
aElements.AppendElement(mCustomContentContainer);
}
void
nsCanvasFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsIScrollableFrame* sf =
PresContext()->GetPresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
sf->RemoveScrollPositionListener(this);
}
// Elements inserted in the custom content container have the same lifetime as
// the document, so before destroying the container, make sure to keep a clone
// of each of them at document level so they can be re-appended on reframe.
if (mCustomContentContainer) {
nsCOMPtr<nsIDocument> doc = mContent->OwnerDoc();
ErrorResult rv;
nsTArray<RefPtr<mozilla::dom::AnonymousContent>>& docAnonContents =
doc->GetAnonymousContents();
for (size_t i = 0, len = docAnonContents.Length(); i < len; ++i) {
AnonymousContent* content = docAnonContents[i];
nsCOMPtr<nsINode> clonedElement = content->GetContentNode()->CloneNode(true, rv);
content->SetContentNode(clonedElement->AsElement());
}
}
nsContentUtils::DestroyAnonymousContent(&mCustomContentContainer);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
void
nsCanvasFrame::ScrollPositionWillChange(nscoord aX, nscoord aY)
{
if (mDoPaintFocus) {
mDoPaintFocus = false;
PresContext()->FrameManager()->GetRootFrame()->InvalidateFrameSubtree();
}
}
NS_IMETHODIMP
nsCanvasFrame::SetHasFocus(bool aHasFocus)
{
if (mDoPaintFocus != aHasFocus) {
mDoPaintFocus = aHasFocus;
PresContext()->FrameManager()->GetRootFrame()->InvalidateFrameSubtree();
if (!mAddedScrollPositionListener) {
nsIScrollableFrame* sf =
PresContext()->GetPresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
sf->AddScrollPositionListener(this);
mAddedScrollPositionListener = true;
}
}
}
return NS_OK;
}
void
nsCanvasFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
NS_ASSERTION(aListID != kPrincipalList ||
aChildList.IsEmpty() || aChildList.OnlyChild(),
"Primary child list can have at most one frame in it");
nsContainerFrame::SetInitialChildList(aListID, aChildList);
MaybePropagateRootElementWritingMode();
}
void
nsCanvasFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
#ifdef DEBUG
MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list");
if (!mFrames.IsEmpty()) {
for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
// We only allow native anonymous child frames to be in principal child
// list in canvas frame.
MOZ_ASSERT(e.get()->GetContent()->IsInNativeAnonymousSubtree(),
"invalid child list");
}
}
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
nsContainerFrame::AppendFrames(aListID, aFrameList);
MaybePropagateRootElementWritingMode();
}
void
nsCanvasFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
// Because we only support a single child frame inserting is the same
// as appending
MOZ_ASSERT(!aPrevFrame, "unexpected previous sibling frame");
AppendFrames(aListID, aFrameList);
MaybePropagateRootElementWritingMode();
}
#ifdef DEBUG
void
nsCanvasFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list");
nsContainerFrame::RemoveFrame(aListID, aOldFrame);
}
#endif
nsRect nsCanvasFrame::CanvasArea() const
{
// Not clear which overflow rect we want here, but it probably doesn't
// matter.
nsRect result(GetVisualOverflowRect());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsRect portRect = scrollableFrame->GetScrollPortRect();
result.UnionRect(result, nsRect(nsPoint(0, 0), portRect.Size()));
}
return result;
}
void
nsDisplayCanvasBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
if (NS_GET_A(mColor) > 0) {
DrawTarget* drawTarget = aCtx->GetDrawTarget();
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
Rect devPxRect =
NSRectToSnappedRect(bgClipRect, appUnitsPerDevPixel, *drawTarget);
drawTarget->FillRect(devPxRect, ColorPattern(ToDeviceColor(mColor)));
}
}
already_AddRefed<Layer>
nsDisplayCanvasBackgroundColor::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
if (NS_GET_A(mColor) == 0) {
return nullptr;
}
if (aManager->GetBackendType() == layers::LayersBackend::LAYERS_WR) {
return BuildDisplayItemLayer(aBuilder, aManager, aContainerParameters);
}
RefPtr<ColorLayer> layer = static_cast<ColorLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateColorLayer();
if (!layer) {
return nullptr;
}
}
layer->SetColor(ToDeviceColor(mColor));
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
layer->SetBounds(bgClipRect.ToNearestPixels(appUnitsPerDevPixel));
layer->SetBaseTransform(gfx::Matrix4x4::Translation(aContainerParameters.mOffset.x,
aContainerParameters.mOffset.y, 0));
return layer.forget();
}
void
nsDisplayCanvasBackgroundColor::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
nsTArray<WebRenderParentCommand>& aParentCommands,
WebRenderDisplayItemLayer* aLayer)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
Rect devPxRect(Float(bgClipRect.x / appUnitsPerDevPixel),
Float(bgClipRect.y / appUnitsPerDevPixel),
Float(bgClipRect.width / appUnitsPerDevPixel),
Float(bgClipRect.height / appUnitsPerDevPixel));
Rect transformedRect = aLayer->RelativeToParent(devPxRect);
aBuilder.PushRect(wr::ToWrRect(transformedRect),
aBuilder.BuildClipRegion(wr::ToWrRect(transformedRect)),
wr::ToWrColor(ToDeviceColor(mColor)));
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayCanvasBackgroundColor::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (rgba "
<< (int)NS_GET_R(mColor) << ","
<< (int)NS_GET_G(mColor) << ","
<< (int)NS_GET_B(mColor) << ","
<< (int)NS_GET_A(mColor) << ")";
}
#endif
#ifndef MOZ_GFX_OPTIMIZE_MOBILE
static void BlitSurface(DrawTarget* aDest, const gfxRect& aRect, DrawTarget* aSource)
{
RefPtr<SourceSurface> source = aSource->Snapshot();
aDest->DrawSurface(source,
Rect(aRect.x, aRect.y, aRect.width, aRect.height),
Rect(0, 0, aRect.width, aRect.height));
}
#endif
void
nsDisplayCanvasBackgroundImage::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
#ifndef MOZ_GFX_OPTIMIZE_MOBILE
RefPtr<gfxContext> dest = aCtx->ThebesContext();
gfxRect destRect;
if (IsSingleFixedPositionImage(aBuilder, bgClipRect, &destRect) &&
aBuilder->IsPaintingToWindow() && !aBuilder->IsCompositingCheap() &&
!dest->CurrentMatrix().HasNonIntegerTranslation()) {
// Snap image rectangle to nearest pixel boundaries. This is the right way
// to snap for this context, because we checked HasNonIntegerTranslation
// above.
destRect.Round();
RefPtr<DrawTarget> dt =
Frame()->Properties().Get(nsIFrame::CachedBackgroundImageDT());
DrawTarget* destDT = dest->GetDrawTarget();
if (dt) {
BlitSurface(destDT, destRect, dt);
return;
}
dt = destDT->CreateSimilarDrawTarget(IntSize::Ceil(destRect.width,
destRect.height),
SurfaceFormat::B8G8R8A8);
if (dt && dt->IsValid()) {
RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
MOZ_ASSERT(ctx); // already checked draw target above
ctx->SetMatrix(ctx->CurrentMatrix().Translate(-destRect.x, -destRect.y));
nsRenderingContext context(ctx);
PaintInternal(aBuilder, &context, bgClipRect, &bgClipRect);
BlitSurface(dest->GetDrawTarget(), destRect, dt);
frame->Properties().Set(nsIFrame::CachedBackgroundImageDT(),
dt.forget().take());
return;
}
}
#endif
PaintInternal(aBuilder, aCtx, mVisibleRect, &bgClipRect);
}
bool
nsDisplayCanvasBackgroundImage::IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
const nsRect& aClipRect,
gfxRect* aDestRect)
{
if (!mBackgroundStyle)
return false;
if (mBackgroundStyle->mImage.mLayers.Length() != 1)
return false;
nsPresContext* presContext = mFrame->PresContext();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
const nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.mLayers[mLayer];
if (layer.mAttachment != NS_STYLE_IMAGELAYER_ATTACHMENT_FIXED)
return false;
nsBackgroundLayerState state =
nsCSSRendering::PrepareImageLayer(presContext, mFrame, flags,
borderArea, aClipRect, layer);
// We only care about images here, not gradients.
if (!mIsRasterImage)
return false;
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
*aDestRect = nsLayoutUtils::RectToGfxRect(state.mFillArea, appUnitsPerDevPixel);
return true;
}
void
nsDisplayCanvasThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
nsPoint offset = ToReferenceFrame();
nsRect bgClipRect = frame->CanvasArea() + offset;
PaintInternal(aBuilder, aCtx, mVisibleRect, &bgClipRect);
}
/**
* A display item to paint the focus ring for the document.
*
* The only reason this can't use nsDisplayGeneric is overriding GetBounds.
*/
class nsDisplayCanvasFocus : public nsDisplayItem {
public:
nsDisplayCanvasFocus(nsDisplayListBuilder* aBuilder, nsCanvasFrame *aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplayCanvasFocus);
}
virtual ~nsDisplayCanvasFocus() {
MOZ_COUNT_DTOR(nsDisplayCanvasFocus);
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) override
{
*aSnap = false;
// This is an overestimate, but that's not a problem.
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
return frame->CanvasArea() + ToReferenceFrame();
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) override
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
frame->PaintFocus(aCtx->GetDrawTarget(), ToReferenceFrame());
}
NS_DISPLAY_DECL_NAME("CanvasFocus", TYPE_CANVAS_FOCUS)
};
void
nsCanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
}
// Force a background to be shown. We may have a background propagated to us,
// in which case StyleBackground wouldn't have the right background
// and the code in nsFrame::DisplayBorderBackgroundOutline might not give us
// a background.
// We don't have any border or outline, and our background draws over
// the overflow area, so just add nsDisplayCanvasBackground instead of
// calling DisplayBorderBackgroundOutline.
if (IsVisibleForPainting(aBuilder)) {
nsStyleContext* bgSC;
const nsStyleBackground* bg = nullptr;
bool isThemed = IsThemed();
if (!isThemed && nsCSSRendering::FindBackground(this, &bgSC)) {
bg = bgSC->StyleBackground();
}
aLists.BorderBackground()->AppendNewToTop(
new (aBuilder) nsDisplayCanvasBackgroundColor(aBuilder, this));
if (isThemed) {
aLists.BorderBackground()->AppendNewToTop(
new (aBuilder) nsDisplayCanvasThemedBackground(aBuilder, this));
return;
}
if (!bg) {
return;
}
const ActiveScrolledRoot* asr =
aBuilder->CurrentActiveScrolledRoot();
bool needBlendContainer = false;
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
// Create separate items for each background layer.
const nsStyleImageLayers& layers = bg->mImage;
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, layers) {
if (layers.mLayers[i].mImage.IsEmpty()) {
continue;
}
if (layers.mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) {
needBlendContainer = true;
}
nsRect bgRect = GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
const ActiveScrolledRoot* thisItemASR = asr;
nsDisplayList thisItemList;
nsDisplayBackgroundImage::InitData bgData =
nsDisplayBackgroundImage::GetInitData(aBuilder, this, i, bgRect, bg,
nsDisplayBackgroundImage::LayerizeFixed::ALWAYS_LAYERIZE_FIXED_BACKGROUND);
if (bgData.shouldFixToViewport) {
auto* displayData = aBuilder->GetCurrentFixedBackgroundDisplayData();
nsDisplayListBuilder::AutoBuildingDisplayList
buildingDisplayList(aBuilder, this, aBuilder->GetDirtyRect(), false);
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(aBuilder);
if (displayData) {
nsRect dirtyRect = displayData->mDirtyRect + GetOffsetTo(PresContext()->GetPresShell()->GetRootFrame());
buildingDisplayList.SetDirtyRect(dirtyRect);
clipState.SetClipChainForContainingBlockDescendants(
displayData->mContainingBlockClipChain);
asrSetter.SetCurrentActiveScrolledRoot(
displayData->mContainingBlockActiveScrolledRoot);
thisItemASR = displayData->mContainingBlockActiveScrolledRoot;
}
nsDisplayCanvasBackgroundImage* bgItem = nullptr;
{
DisplayListClipState::AutoSaveRestore bgImageClip(aBuilder);
bgImageClip.Clear();
bgItem = new (aBuilder) nsDisplayCanvasBackgroundImage(bgData);
}
thisItemList.AppendNewToTop(
nsDisplayFixedPosition::CreateForFixedBackground(aBuilder, this, bgItem, i));
} else {
thisItemList.AppendNewToTop(new (aBuilder) nsDisplayCanvasBackgroundImage(bgData));
}
if (layers.mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) {
DisplayListClipState::AutoSaveRestore blendClip(aBuilder);
blendClip.ClearUpToASR(thisItemASR);
thisItemList.AppendNewToTop(
new (aBuilder) nsDisplayBlendMode(aBuilder, this, &thisItemList,
layers.mLayers[i].mBlendMode,
thisItemASR, i + 1));
}
aLists.BorderBackground()->AppendToTop(&thisItemList);
}
if (needBlendContainer) {
const ActiveScrolledRoot* containerASR = contASRTracker.GetContainerASR();
DisplayListClipState::AutoSaveRestore blendContainerClip(aBuilder);
blendContainerClip.ClearUpToASR(containerASR);
aLists.BorderBackground()->AppendNewToTop(
nsDisplayBlendContainer::CreateForBackgroundBlendMode(aBuilder, this,
aLists.BorderBackground(),
containerASR));
}
}
for (nsIFrame* kid : PrincipalChildList()) {
// Put our child into its own pseudo-stack.
BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
}
#ifdef DEBUG_CANVAS_FOCUS
nsCOMPtr<nsIContent> focusContent;
aPresContext->EventStateManager()->
GetFocusedContent(getter_AddRefs(focusContent));
bool hasFocus = false;
nsCOMPtr<nsISupports> container;
aPresContext->GetContainer(getter_AddRefs(container));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
if (docShell) {
docShell->GetHasFocus(&hasFocus);
printf("%p - nsCanvasFrame::Paint R:%d,%d,%d,%d DR: %d,%d,%d,%d\n", this,
mRect.x, mRect.y, mRect.width, mRect.height,
aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height);
}
printf("%p - Focus: %s c: %p DoPaint:%s\n", docShell.get(), hasFocus?"Y":"N",
focusContent.get(), mDoPaintFocus?"Y":"N");
#endif
if (!mDoPaintFocus)
return;
// Only paint the focus if we're visible
if (!StyleVisibility()->IsVisible())
return;
aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayCanvasFocus(aBuilder, this));
}
void
nsCanvasFrame::PaintFocus(DrawTarget* aDrawTarget, nsPoint aPt)
{
nsRect focusRect(aPt, GetSize());
nsIScrollableFrame *scrollableFrame = do_QueryFrame(GetParent());
if (scrollableFrame) {
nsRect portRect = scrollableFrame->GetScrollPortRect();
focusRect.width = portRect.width;
focusRect.height = portRect.height;
focusRect.MoveBy(scrollableFrame->GetScrollPosition());
}
// XXX use the root frame foreground color, but should we find BODY frame
// for HTML documents?
nsIFrame* root = mFrames.FirstChild();
const nsStyleColor* color = root ? root->StyleColor() : StyleColor();
if (!color) {
NS_ERROR("current color cannot be found");
return;
}
nsCSSRendering::PaintFocus(PresContext(), aDrawTarget,
focusRect, color->mColor);
}
/* virtual */ nscoord
nsCanvasFrame::GetMinISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetMinISize(aRenderingContext);
return result;
}
/* virtual */ nscoord
nsCanvasFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
if (mFrames.IsEmpty())
result = 0;
else
result = mFrames.FirstChild()->GetPrefISize(aRenderingContext);
return result;
}
void
nsCanvasFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsCanvasFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
NS_FRAME_TRACE_REFLOW_IN("nsCanvasFrame::Reflow");
// Initialize OUT parameter
aStatus.Reset();
nsCanvasFrame* prevCanvasFrame = static_cast<nsCanvasFrame*>
(GetPrevInFlow());
if (prevCanvasFrame) {
AutoFrameListPtr overflow(aPresContext,
prevCanvasFrame->StealOverflowFrames());
if (overflow) {
NS_ASSERTION(overflow->OnlyChild(),
"must have doc root as canvas frame's only child");
nsContainerFrame::ReparentFrameViewList(*overflow, prevCanvasFrame, this);
// Prepend overflow to the our child list. There may already be
// children placeholders for fixed-pos elements, which don't get
// reflowed but must not be lost until the canvas frame is destroyed.
mFrames.InsertFrames(this, nullptr, *overflow);
}
}
// Set our size up front, since some parts of reflow depend on it
// being already set. Note that the computed height may be
// unconstrained; that's ok. Consumers should watch out for that.
SetSize(nsSize(aReflowInput.ComputedWidth(), aReflowInput.ComputedHeight()));
// Reflow our one and only normal child frame. It's either the root
// element's frame or a placeholder for that frame, if the root element
// is abs-pos or fixed-pos. We may have additional children which
// are placeholders for continuations of fixed-pos content, but those
// don't need to be reflowed. The normal child is always comes before
// the fixed-pos placeholders, because we insert it at the start
// of the child list, above.
ReflowOutput kidDesiredSize(aReflowInput);
if (mFrames.IsEmpty()) {
// We have no child frame, so return an empty size
aDesiredSize.Width() = aDesiredSize.Height() = 0;
} else {
nsIFrame* kidFrame = mFrames.FirstChild();
bool kidDirty = (kidFrame->GetStateBits() & NS_FRAME_IS_DIRTY) != 0;
ReflowInput
kidReflowInput(aPresContext, aReflowInput, kidFrame,
aReflowInput.AvailableSize(kidFrame->GetWritingMode()));
if (aReflowInput.IsBResizeForWM(kidReflowInput.GetWritingMode()) &&
(kidFrame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
// Tell our kid it's being block-dir resized too. Bit of a
// hack for framesets.
kidReflowInput.SetBResize(true);
}
WritingMode wm = aReflowInput.GetWritingMode();
WritingMode kidWM = kidReflowInput.GetWritingMode();
nsSize containerSize = aReflowInput.ComputedPhysicalSize();
LogicalMargin margin = kidReflowInput.ComputedLogicalMargin();
LogicalPoint kidPt(kidWM, margin.IStart(kidWM), margin.BStart(kidWM));
kidReflowInput.ApplyRelativePositioning(&kidPt, containerSize);
// Reflow the frame
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowInput,
kidWM, kidPt, containerSize, 0, aStatus);
// Complete the reflow and position and size the child frame
FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, &kidReflowInput,
kidWM, kidPt, containerSize, 0);
if (!aStatus.IsFullyComplete()) {
nsIFrame* nextFrame = kidFrame->GetNextInFlow();
NS_ASSERTION(nextFrame || aStatus.NextInFlowNeedsReflow(),
"If it's incomplete and has no nif yet, it must flag a nif reflow.");
if (!nextFrame) {
nextFrame = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, kidFrame, this);
SetOverflowFrames(nsFrameList(nextFrame, nextFrame));
// Root overflow containers will be normal children of
// the canvas frame, but that's ok because there
// aren't any other frames we need to isolate them from
// during reflow.
}
if (aStatus.IsOverflowIncomplete()) {
nextFrame->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
}
}
// If the child frame was just inserted, then we're responsible for making sure
// it repaints
if (kidDirty) {
// But we have a new child, which will affect our background, so
// invalidate our whole rect.
// Note: Even though we request to be sized to our child's size, our
// scroll frame ensures that we are always the size of the viewport.
// Also note: GetPosition() on a CanvasFrame is always going to return
// (0, 0). We only want to invalidate GetRect() since Get*OverflowRect()
// could also include overflow to our top and left (out of the viewport)
// which doesn't need to be painted.
nsIFrame* viewport = PresContext()->GetPresShell()->GetRootFrame();
viewport->InvalidateFrame();
}
// Return our desired size. Normally it's what we're told, but
// sometimes we can be given an unconstrained height (when a window
// is sizing-to-content), and we should compute our desired height.
LogicalSize finalSize(wm);
finalSize.ISize(wm) = aReflowInput.ComputedISize();
if (aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE) {
finalSize.BSize(wm) = kidFrame->GetLogicalSize(wm).BSize(wm) +
kidReflowInput.ComputedLogicalMargin().BStartEnd(wm);
} else {
finalSize.BSize(wm) = aReflowInput.ComputedBSize();
}
aDesiredSize.SetSize(wm, finalSize);
aDesiredSize.SetOverflowAreasToDesiredBounds();
aDesiredSize.mOverflowAreas.UnionWith(
kidDesiredSize.mOverflowAreas + kidFrame->GetPosition());
}
if (prevCanvasFrame) {
ReflowOverflowContainerChildren(aPresContext, aReflowInput,
aDesiredSize.mOverflowAreas, 0,
aStatus);
}
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, aStatus);
NS_FRAME_TRACE_REFLOW_OUT("nsCanvasFrame::Reflow", aStatus);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
nsIAtom*
nsCanvasFrame::GetType() const
{
return nsGkAtoms::canvasFrame;
}
nsresult
nsCanvasFrame::GetContentForEvent(WidgetEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsresult rv = nsFrame::GetContentForEvent(aEvent,
aContent);
if (NS_FAILED(rv) || !*aContent) {
nsIFrame* kid = mFrames.FirstChild();
if (kid) {
rv = kid->GetContentForEvent(aEvent,
aContent);
}
}
return rv;
}
void
nsCanvasFrame::MaybePropagateRootElementWritingMode()
{
nsIFrame* child = PrincipalChildList().FirstChild();
if (child && child->GetContent() &&
child->GetContent() == PresContext()->Document()->GetRootElement()) {
nsIFrame* childPrimary = child->GetContent()->GetPrimaryFrame();
PropagateRootElementWritingMode(childPrimary->GetWritingMode());
}
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsCanvasFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Canvas"), aResult);
}
#endif
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