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fune/layout/svg/SVGOuterSVGFrame.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
// Main header first:
#include "SVGOuterSVGFrame.h"
// Keep others in (case-insensitive) order:
#include "gfxContext.h"
#include "nsDisplayList.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsLayoutUtils.h"
#include "nsObjectLoadingContent.h"
#include "nsSubDocumentFrame.h"
#include "mozilla/PresShell.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/SVGSVGElement.h"
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
//----------------------------------------------------------------------
// Implementation
nsContainerFrame* NS_NewSVGOuterSVGFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGOuterSVGFrame(aStyle, aPresShell->GetPresContext());
}
namespace mozilla {
NS_IMPL_FRAMEARENA_HELPERS(SVGOuterSVGFrame)
SVGOuterSVGFrame::SVGOuterSVGFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: SVGDisplayContainerFrame(aStyle, aPresContext, kClassID) {
// Outer-<svg> has CSS layout, so remove this bit:
RemoveStateBits(NS_FRAME_SVG_LAYOUT);
AddStateBits(NS_FRAME_REFLOW_ROOT | NS_FRAME_FONT_INFLATION_CONTAINER |
NS_FRAME_FONT_INFLATION_FLOW_ROOT | NS_FRAME_MAY_BE_TRANSFORMED);
}
// The CSS Containment spec says that size-contained replaced elements must be
// treated as having an intrinsic width and height of 0. That's applicable to
// outer SVG frames, unless they're the outermost element (in which case
// they're not really "replaced", and there's no outer context to contain sizes
// from leaking into). Hence, we check for a parent element before we bother
// testing for 'contain:size'.
static inline ContainSizeAxes ContainSizeAxesIfApplicable(
const SVGOuterSVGFrame* aFrame) {
if (!aFrame->GetContent()->GetParent()) {
return ContainSizeAxes(false, false);
}
return aFrame->GetContainSizeAxes();
}
// This should match ImageDocument::GetZoomLevel.
float SVGOuterSVGFrame::ComputeFullZoom() const {
MOZ_ASSERT(mIsRootContent);
MOZ_ASSERT(!mIsInIframe);
if (BrowsingContext* bc = PresContext()->Document()->GetBrowsingContext()) {
return bc->FullZoom();
}
return 1.0f;
}
void SVGOuterSVGFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svg),
"Content is not an SVG 'svg' element!");
// Check for conditional processing attributes here rather than in
// nsCSSFrameConstructor::FindSVGData because we want to avoid
// simply giving failing outer <svg> elements an SVGContainerFrame.
// We don't create other SVG frames if PassesConditionalProcessingTests
// returns false, but since we do create SVGOuterSVGFrame frames we
// prevent them from painting by [ab]use NS_FRAME_IS_NONDISPLAY. The
// frame will be recreated via an nsChangeHint_ReconstructFrame restyle if
// the value returned by PassesConditionalProcessingTests changes.
auto* svg = static_cast<SVGSVGElement*>(aContent);
if (!svg->PassesConditionalProcessingTests()) {
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
Document* doc = mContent->GetUncomposedDoc();
mIsRootContent = doc && doc->GetRootElement() == mContent;
if (mIsRootContent) {
if (nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell()) {
RefPtr<BrowsingContext> bc = docShell->GetBrowsingContext();
if (const Maybe<nsString>& type = bc->GetEmbedderElementType()) {
mIsInObjectOrEmbed =
nsGkAtoms::object->Equals(*type) || nsGkAtoms::embed->Equals(*type);
mIsInIframe = nsGkAtoms::iframe->Equals(*type);
}
}
if (!mIsInIframe) {
mFullZoom = ComputeFullZoom();
}
}
MaybeSendIntrinsicSizeAndRatioToEmbedder();
}
//----------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(SVGOuterSVGFrame)
NS_QUERYFRAME_ENTRY(SVGOuterSVGFrame)
NS_QUERYFRAME_ENTRY(ISVGSVGFrame)
NS_QUERYFRAME_TAIL_INHERITING(SVGDisplayContainerFrame)
//----------------------------------------------------------------------
// nsIFrame methods
//----------------------------------------------------------------------
// reflowing
/* virtual */
nscoord SVGOuterSVGFrame::GetMinISize(gfxContext* aRenderingContext) {
auto size = GetIntrinsicSize();
const auto& iSize = GetWritingMode().IsVertical() ? size.height : size.width;
return iSize.valueOr(0);
}
/* virtual */
nscoord SVGOuterSVGFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord result;
SVGSVGElement* svg = static_cast<SVGSVGElement*>(GetContent());
WritingMode wm = GetWritingMode();
const SVGAnimatedLength& isize =
wm.IsVertical() ? svg->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]
: svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
if (Maybe<nscoord> containISize =
ContainSizeAxesIfApplicable(this).ContainIntrinsicISize(*this)) {
result = *containISize;
} else if (isize.IsPercentage()) {
// If we are here, our inline size attribute is a percentage either
// explicitly (via an attribute value) or implicitly (by being unset, which
// is treated as 100%). The following if-condition, deciding to return
// either the fallback intrinsic size or zero, is made to match blink and
// webkit's behavior for webcompat.
if (isize.IsExplicitlySet() || StylePosition()->ISize(wm).HasPercent() ||
!GetAspectRatio()) {
result = wm.IsVertical() ? kFallbackIntrinsicSize.height
: kFallbackIntrinsicSize.width;
} else {
result = nscoord(0);
}
} else {
result =
nsPresContext::CSSPixelsToAppUnits(isize.GetAnimValueWithZoom(svg));
if (result < 0) {
result = nscoord(0);
}
}
return result;
}
/* virtual */
IntrinsicSize SVGOuterSVGFrame::GetIntrinsicSize() {
// XXXjwatt Note that here we want to return the CSS width/height if they're
// specified and we're embedded inside an nsIObjectLoadingContent.
const auto containAxes = ContainSizeAxesIfApplicable(this);
if (containAxes.IsBoth()) {
// Intrinsic size of 'contain:size' replaced elements is determined by
// contain-intrinsic-size, defaulting to 0x0.
return FinishIntrinsicSize(containAxes, IntrinsicSize(0, 0));
}
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
const SVGAnimatedLength& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
const SVGAnimatedLength& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
IntrinsicSize intrinsicSize;
if (!width.IsPercentage()) {
nscoord val =
nsPresContext::CSSPixelsToAppUnits(width.GetAnimValueWithZoom(content));
intrinsicSize.width.emplace(std::max(val, 0));
}
if (!height.IsPercentage()) {
nscoord val = nsPresContext::CSSPixelsToAppUnits(
height.GetAnimValueWithZoom(content));
intrinsicSize.height.emplace(std::max(val, 0));
}
return FinishIntrinsicSize(containAxes, intrinsicSize);
}
/* virtual */
AspectRatio SVGOuterSVGFrame::GetIntrinsicRatio() const {
if (ContainSizeAxesIfApplicable(this).IsAny()) {
return AspectRatio();
}
// We only have an intrinsic size/ratio if our width and height attributes
// are both specified and set to non-percentage values, or we have a viewBox
// rect: https://svgwg.org/svg2-draft/coords.html#SizingSVGInCSS
auto* content = static_cast<SVGSVGElement*>(GetContent());
const SVGAnimatedLength& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
const SVGAnimatedLength& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
if (!width.IsPercentage() && !height.IsPercentage()) {
// Use width/height ratio only if
// 1. it's not a degenerate ratio, and
// 2. width and height are non-negative numbers.
// Otherwise, we use the viewbox rect.
// https://github.com/w3c/csswg-drafts/issues/6286
const float w = width.GetAnimValue(content);
const float h = height.GetAnimValue(content);
if (w > 0.0f && h > 0.0f) {
return AspectRatio::FromSize(w, h);
}
}
const auto& viewBox = content->GetViewBoxInternal();
if (viewBox.HasRect()) {
const auto& anim = viewBox.GetAnimValue();
return AspectRatio::FromSize(anim.width, anim.height);
}
return SVGDisplayContainerFrame::GetIntrinsicRatio();
}
/* virtual */
nsIFrame::SizeComputationResult SVGOuterSVGFrame::ComputeSize(
gfxContext* aRenderingContext, WritingMode aWritingMode,
const LogicalSize& aCBSize, nscoord aAvailableISize,
const LogicalSize& aMargin, const LogicalSize& aBorderPadding,
const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) {
if (IsRootOfImage() || mIsInObjectOrEmbed) {
// The embedding element has sized itself using the CSS replaced element
// sizing rules, using our intrinsic dimensions as necessary. The SVG spec
// says that the width and height of embedded SVG is overridden by the
// width and height of the embedding element, so we just need to size to
// the viewport that the embedding element has established for us.
return {aCBSize, AspectRatioUsage::None};
}
LogicalSize cbSize = aCBSize;
IntrinsicSize intrinsicSize = GetIntrinsicSize();
if (mIsRootContent) {
// We're the root of the outermost browsing context, so we need to scale
// cbSize by the full-zoom so that SVGs with percentage width/height zoom:
NS_ASSERTION(aCBSize.ISize(aWritingMode) != NS_UNCONSTRAINEDSIZE &&
aCBSize.BSize(aWritingMode) != NS_UNCONSTRAINEDSIZE,
"root should not have auto-width/height containing block");
if (!mIsInIframe) {
// NOTE: We can't just use mFullZoom because this can run before Reflow()
// updates it.
const float zoom = ComputeFullZoom();
cbSize.ISize(aWritingMode) *= zoom;
cbSize.BSize(aWritingMode) *= zoom;
}
// We also need to honour the width and height attributes' default values
// of 100% when we're the root of a browsing context. (GetIntrinsicSize()
// doesn't report these since there's no such thing as a percentage
// intrinsic size. Also note that explicit percentage values are mapped
// into style, so the following isn't for them.)
auto* content = static_cast<SVGSVGElement*>(GetContent());
const SVGAnimatedLength& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
if (width.IsPercentage()) {
MOZ_ASSERT(!intrinsicSize.width,
"GetIntrinsicSize should have reported no intrinsic width");
float val = width.GetAnimValInSpecifiedUnits() / 100.0f;
intrinsicSize.width.emplace(std::max(val, 0.0f) *
cbSize.Width(aWritingMode));
}
const SVGAnimatedLength& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
NS_ASSERTION(aCBSize.BSize(aWritingMode) != NS_UNCONSTRAINEDSIZE,
"root should not have auto-height containing block");
if (height.IsPercentage()) {
MOZ_ASSERT(!intrinsicSize.height,
"GetIntrinsicSize should have reported no intrinsic height");
float val = height.GetAnimValInSpecifiedUnits() / 100.0f;
intrinsicSize.height.emplace(std::max(val, 0.0f) *
cbSize.Height(aWritingMode));
}
MOZ_ASSERT(intrinsicSize.height && intrinsicSize.width,
"We should have just handled the only situation where"
"we lack an intrinsic height or width.");
}
return {ComputeSizeWithIntrinsicDimensions(
aRenderingContext, aWritingMode, intrinsicSize, GetAspectRatio(),
cbSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
AspectRatioUsage::None};
}
void SVGOuterSVGFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("SVGOuterSVGFrame");
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_FRAME_TRACE(
NS_FRAME_TRACE_CALLS,
("enter SVGOuterSVGFrame::Reflow: availSize=%d,%d",
aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_IN_REFLOW), "frame is not in reflow");
const auto wm = GetWritingMode();
aDesiredSize.SetSize(wm, aReflowInput.ComputedSizeWithBorderPadding(wm));
NS_ASSERTION(!GetPrevInFlow(), "SVG can't currently be broken across pages.");
SVGSVGElement* svgElem = static_cast<SVGSVGElement*>(GetContent());
auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
// Initialize
svgElem->UpdateHasChildrenOnlyTransform();
}
// If our SVG viewport has changed, update our content and notify.
// http://www.w3.org/TR/SVG11/coords.html#ViewportSpace
gfx::Size newViewportSize(
nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedWidth()),
nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedHeight()));
uint32_t changeBits = 0;
if (newViewportSize != svgElem->GetViewportSize()) {
// When our viewport size changes, we may need to update the overflow rects
// of our child frames. This is the case if:
//
// * We have a real/synthetic viewBox (a children-only transform), since
// the viewBox transform will change as the viewport dimensions change.
//
// * We do not have a real/synthetic viewBox, but the last time we
// reflowed (or the last time UpdateOverflow() was called) we did.
//
// We only handle the former case here, in which case we mark all our child
// frames as dirty so that we reflow them below and update their overflow
// rects.
//
// In the latter case, updating of overflow rects is handled for removal of
// real viewBox (the viewBox attribute) in AttributeChanged. Synthetic
// viewBox "removal" (e.g. a document references the same SVG via both an
// <svg:image> and then as a CSS background image (a synthetic viewBox is
// used when painting the former, but not when painting the latter)) is
// handled in SVGSVGElement::FlushImageTransformInvalidation.
//
if (svgElem->HasViewBoxOrSyntheticViewBox()) {
nsIFrame* anonChild = PrincipalChildList().FirstChild();
anonChild->MarkSubtreeDirty();
for (nsIFrame* child : anonChild->PrincipalChildList()) {
child->MarkSubtreeDirty();
}
}
changeBits |= COORD_CONTEXT_CHANGED;
svgElem->SetViewportSize(newViewportSize);
}
if (mIsRootContent && !mIsInIframe) {
const auto oldZoom = mFullZoom;
mFullZoom = ComputeFullZoom();
if (oldZoom != mFullZoom) {
changeBits |= FULL_ZOOM_CHANGED;
}
}
if (changeBits && !HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
NotifyViewportOrTransformChanged(changeBits);
}
// Now that we've marked the necessary children as dirty, call
// ReflowSVG() or ReflowSVGNonDisplayText() on them, depending
// on whether we are non-display.
mCallingReflowSVG = true;
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
ReflowSVGNonDisplayText(this);
} else {
// Update the mRects and ink overflow rects of all our descendants,
// including our anonymous wrapper kid:
anonKid->ReflowSVG();
MOZ_ASSERT(!anonKid->GetNextSibling(),
"We should have one anonymous child frame wrapping our real "
"children");
}
mCallingReflowSVG = false;
// Set our anonymous kid's offset from our border box:
anonKid->SetPosition(GetContentRectRelativeToSelf().TopLeft());
// Including our size in our overflow rects regardless of the value of
// 'background', 'border', etc. makes sure that we usually (when we clip to
// our content area) don't have to keep changing our overflow rects as our
// descendants move about (see perf comment below). Including our size in our
// scrollable overflow rect also makes sure that we scroll if we're too big
// for our viewport.
//
// <svg> never allows scrolling to anything outside its mRect (only panning),
// so we must always keep our scrollable overflow set to our size.
//
// With regards to ink overflow, we always clip root-<svg> (see our
// BuildDisplayList method) regardless of the value of the 'overflow'
// property since that is per-spec, even for the initial 'visible' value. For
// that reason there's no point in adding descendant ink overflow to our
// own when this frame is for a root-<svg>. That said, there's also a very
// good performance reason for us wanting to avoid doing so. If we did, then
// the frame's overflow would often change as descendants that are partially
// or fully outside its rect moved (think animation on/off screen), and that
// would cause us to do a full NS_FRAME_IS_DIRTY reflow and repaint of the
// entire document tree each such move (see bug 875175).
//
// So it's only non-root outer-<svg> that has the ink overflow of its
// descendants added to its own. (Note that the default user-agent style
// sheet makes 'hidden' the default value for :not(root(svg)), so usually
// FinishAndStoreOverflow will still clip this back to the frame's rect.)
//
// WARNING!! Keep UpdateBounds below in sync with whatever we do for our
// overflow rects here! (Again, see bug 875175.)
//
aDesiredSize.SetOverflowAreasToDesiredBounds();
// An outer SVG will be here as a nondisplay if it fails the conditional
// processing test. In that case, we don't maintain its overflow.
if (!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
if (!mIsRootContent) {
aDesiredSize.mOverflowAreas.InkOverflow().UnionRect(
aDesiredSize.mOverflowAreas.InkOverflow(),
anonKid->InkOverflowRect() + anonKid->GetPosition());
}
FinishAndStoreOverflow(&aDesiredSize);
}
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit SVGOuterSVGFrame::Reflow: size=%d,%d",
aDesiredSize.Width(), aDesiredSize.Height()));
}
void SVGOuterSVGFrame::DidReflow(nsPresContext* aPresContext,
const ReflowInput* aReflowInput) {
SVGDisplayContainerFrame::DidReflow(aPresContext, aReflowInput);
// Make sure elements styled by :hover get updated if script/animation moves
// them under or out from under the pointer:
PresShell()->SynthesizeMouseMove(false);
}
/* virtual */
void SVGOuterSVGFrame::UnionChildOverflow(OverflowAreas& aOverflowAreas) {
// See the comments in Reflow above.
// WARNING!! Keep this in sync with Reflow above!
if (!mIsRootContent) {
nsIFrame* anonKid = PrincipalChildList().FirstChild();
aOverflowAreas.InkOverflow().UnionRect(
aOverflowAreas.InkOverflow(),
anonKid->InkOverflowRect() + anonKid->GetPosition());
}
}
//----------------------------------------------------------------------
// container methods
nsresult SVGOuterSVGFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (aNameSpaceID == kNameSpaceID_None &&
!HasAnyStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_NONDISPLAY)) {
if (aAttribute == nsGkAtoms::viewBox ||
aAttribute == nsGkAtoms::preserveAspectRatio ||
aAttribute == nsGkAtoms::transform) {
// make sure our cached transform matrix gets (lazily) updated
mCanvasTM = nullptr;
SVGUtils::NotifyChildrenOfSVGChange(
PrincipalChildList().FirstChild(),
aAttribute == nsGkAtoms::viewBox
? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED
: TRANSFORM_CHANGED);
if (aAttribute != nsGkAtoms::transform) {
static_cast<SVGSVGElement*>(GetContent())
->ChildrenOnlyTransformChanged();
}
}
if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::viewBox) {
// Don't call ChildrenOnlyTransformChanged() here, since we call it
// under Reflow if the width/height/viewBox actually changed.
MaybeSendIntrinsicSizeAndRatioToEmbedder();
if (!mIsInObjectOrEmbed) {
// We are not embedded by reference, so our 'width' and 'height'
// attributes are not overridden (and viewBox may influence our
// intrinsic aspect ratio). We need to reflow.
PresShell()->FrameNeedsReflow(
this, IntrinsicDirty::FrameAncestorsAndDescendants,
NS_FRAME_IS_DIRTY);
}
}
}
return NS_OK;
}
bool SVGOuterSVGFrame::IsSVGTransformed(Matrix* aOwnTransform,
Matrix* aFromParentTransform) const {
// Our anonymous child's HasChildrenOnlyTransform() implementation makes sure
// our children-only transforms are applied to our children. We only care
// about transforms that transform our own frame here.
bool foundTransform = false;
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
SVGAnimatedTransformList* transformList = content->GetAnimatedTransformList();
if ((transformList && transformList->HasTransform()) ||
content->GetAnimateMotionTransform()) {
if (aOwnTransform) {
*aOwnTransform = gfx::ToMatrix(
content->PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent));
}
foundTransform = true;
}
return foundTransform;
}
//----------------------------------------------------------------------
// painting
void SVGOuterSVGFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
return;
}
DisplayBorderBackgroundOutline(aBuilder, aLists);
nsRect visibleRect = aBuilder->GetVisibleRect();
nsRect dirtyRect = aBuilder->GetDirtyRect();
// Per-spec, we always clip root-<svg> even when 'overflow' has its initial
// value of 'visible'. See also the "ink overflow" comments in Reflow.
DisplayListClipState::AutoSaveRestore autoSR(aBuilder);
if (mIsRootContent || StyleDisplay()->IsScrollableOverflow()) {
autoSR.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
visibleRect = visibleRect.Intersect(GetContentRectRelativeToSelf());
dirtyRect = dirtyRect.Intersect(GetContentRectRelativeToSelf());
}
nsDisplayListBuilder::AutoBuildingDisplayList building(
aBuilder, this, visibleRect, dirtyRect);
nsDisplayList* contentList = aLists.Content();
nsDisplayListSet set(contentList, contentList, contentList, contentList,
contentList, contentList);
BuildDisplayListForNonBlockChildren(aBuilder, set);
}
//----------------------------------------------------------------------
// ISVGSVGFrame methods:
void SVGOuterSVGFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) {
MOZ_ASSERT(aFlags && !(aFlags & ~(COORD_CONTEXT_CHANGED | TRANSFORM_CHANGED |
FULL_ZOOM_CHANGED)),
"Unexpected aFlags value");
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
if (aFlags & COORD_CONTEXT_CHANGED) {
if (content->HasViewBox()) {
// Percentage lengths on children resolve against the viewBox rect so we
// don't need to notify them of the viewport change, but the viewBox
// transform will have changed, so we need to notify them of that instead.
aFlags = TRANSFORM_CHANGED;
} else if (content->ShouldSynthesizeViewBox()) {
// In the case of a synthesized viewBox, the synthetic viewBox's rect
// changes as the viewport changes. As a result we need to maintain the
// COORD_CONTEXT_CHANGED flag.
aFlags |= TRANSFORM_CHANGED;
} else if (mCanvasTM && mCanvasTM->IsSingular()) {
// A width/height of zero will result in us having a singular mCanvasTM
// even when we don't have a viewBox. So we also want to recompute our
// mCanvasTM for this width/height change even though we don't have a
// viewBox.
aFlags |= TRANSFORM_CHANGED;
}
}
bool haveNonFulLZoomTransformChange = (aFlags & TRANSFORM_CHANGED);
if (aFlags & FULL_ZOOM_CHANGED) {
// Convert FULL_ZOOM_CHANGED to TRANSFORM_CHANGED:
aFlags = (aFlags & ~FULL_ZOOM_CHANGED) | TRANSFORM_CHANGED;
}
if (aFlags & TRANSFORM_CHANGED) {
// Make sure our canvas transform matrix gets (lazily) recalculated:
mCanvasTM = nullptr;
if (haveNonFulLZoomTransformChange &&
!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
uint32_t flags = HasAnyStateBits(NS_FRAME_IN_REFLOW)
? SVGSVGElement::eDuringReflow
: 0;
content->ChildrenOnlyTransformChanged(flags);
}
}
SVGUtils::NotifyChildrenOfSVGChange(PrincipalChildList().FirstChild(),
aFlags);
}
//----------------------------------------------------------------------
// ISVGDisplayableFrame methods:
void SVGOuterSVGFrame::PaintSVG(gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams) {
NS_ASSERTION(
PrincipalChildList().FirstChild()->IsSVGOuterSVGAnonChildFrame() &&
!PrincipalChildList().FirstChild()->GetNextSibling(),
"We should have a single, anonymous, child");
auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
anonKid->PaintSVG(aContext, aTransform, aImgParams);
}
SVGBBox SVGOuterSVGFrame::GetBBoxContribution(
const gfx::Matrix& aToBBoxUserspace, uint32_t aFlags) {
NS_ASSERTION(
PrincipalChildList().FirstChild()->IsSVGOuterSVGAnonChildFrame() &&
!PrincipalChildList().FirstChild()->GetNextSibling(),
"We should have a single, anonymous, child");
// We must defer to our child so that we don't include our
// content->PrependLocalTransformsTo() transforms.
auto* anonKid = static_cast<SVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
return anonKid->GetBBoxContribution(aToBBoxUserspace, aFlags);
}
//----------------------------------------------------------------------
// SVGContainerFrame methods:
gfxMatrix SVGOuterSVGFrame::GetCanvasTM() {
if (!mCanvasTM) {
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
float devPxPerCSSPx = 1.0f / nsPresContext::AppUnitsToFloatCSSPixels(
PresContext()->AppUnitsPerDevPixel());
gfxMatrix tm = content->PrependLocalTransformsTo(
gfxMatrix::Scaling(devPxPerCSSPx, devPxPerCSSPx));
mCanvasTM = MakeUnique<gfxMatrix>(tm);
}
return *mCanvasTM;
}
//----------------------------------------------------------------------
// Implementation helpers
bool SVGOuterSVGFrame::IsRootOfImage() {
if (!mContent->GetParent()) {
// Our content is the document element
Document* doc = mContent->GetUncomposedDoc();
if (doc && doc->IsBeingUsedAsImage()) {
// Our document is being used as an image
return true;
}
}
return false;
}
bool SVGOuterSVGFrame::VerticalScrollbarNotNeeded() const {
const SVGAnimatedLength& height =
static_cast<SVGSVGElement*>(GetContent())
->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
return height.IsPercentage() && height.GetBaseValInSpecifiedUnits() <= 100;
}
void SVGOuterSVGFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
nsIFrame* anonKid = PrincipalChildList().FirstChild();
MOZ_ASSERT(anonKid->IsSVGOuterSVGAnonChildFrame());
aResult.AppendElement(OwnedAnonBox(anonKid));
}
void SVGOuterSVGFrame::MaybeSendIntrinsicSizeAndRatioToEmbedder() {
MaybeSendIntrinsicSizeAndRatioToEmbedder(Some(GetIntrinsicSize()),
Some(GetAspectRatio()));
}
void SVGOuterSVGFrame::MaybeSendIntrinsicSizeAndRatioToEmbedder(
Maybe<IntrinsicSize> aIntrinsicSize, Maybe<AspectRatio> aIntrinsicRatio) {
if (!mIsInObjectOrEmbed) {
return;
}
nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell();
if (!docShell) {
return;
}
BrowsingContext* bc = docShell->GetBrowsingContext();
MOZ_ASSERT(bc->IsContentSubframe());
if (bc->GetParent()->IsInProcess()) {
if (Element* embedder = bc->GetEmbedderElement()) {
if (nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(embedder)) {
static_cast<nsObjectLoadingContent*>(olc.get())
->SubdocumentIntrinsicSizeOrRatioChanged(aIntrinsicSize,
aIntrinsicRatio);
}
return;
}
}
if (BrowserChild* browserChild = BrowserChild::GetFrom(docShell)) {
Unused << browserChild->SendIntrinsicSizeOrRatioChanged(aIntrinsicSize,
aIntrinsicRatio);
}
}
void SVGOuterSVGFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
SVGDisplayContainerFrame::DidSetComputedStyle(aOldComputedStyle);
if (!aOldComputedStyle) {
return;
}
if (aOldComputedStyle->StylePosition()->mAspectRatio !=
StylePosition()->mAspectRatio) {
// Our aspect-ratio property value changed, and an embedding <object> or
// <embed> might care about that.
MaybeSendIntrinsicSizeAndRatioToEmbedder();
}
}
void SVGOuterSVGFrame::Destroy(DestroyContext& aContext) {
// This handles both the case when the root <svg> element is made display:none
// (and thus loses its intrinsic size and aspect ratio), and when the frame
// is navigated elsewhere & we need to reset parent <object>/<embed>'s
// recorded intrinsic size/ratio values.
MaybeSendIntrinsicSizeAndRatioToEmbedder(Nothing(), Nothing());
SVGDisplayContainerFrame::Destroy(aContext);
}
} // namespace mozilla
//----------------------------------------------------------------------
// Implementation of SVGOuterSVGAnonChildFrame
nsContainerFrame* NS_NewSVGOuterSVGAnonChildFrame(
mozilla::PresShell* aPresShell, mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGOuterSVGAnonChildFrame(aStyle, aPresShell->GetPresContext());
}
namespace mozilla {
NS_IMPL_FRAMEARENA_HELPERS(SVGOuterSVGAnonChildFrame)
#ifdef DEBUG
void SVGOuterSVGAnonChildFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(aParent->IsSVGOuterSVGFrame(), "Unexpected parent");
SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif
void SVGOuterSVGAnonChildFrame::BuildDisplayList(
nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) {
// Wrap our contents into an nsDisplaySVGWrapper.
// We wrap this frame instead of the SVGOuterSVGFrame so that the wrapper
// doesn't contain the <svg> element's CSS styles, like backgrounds or
// borders. Creating the nsDisplaySVGWrapper here also means that it'll be
// inside the nsDisplayTransform for our viewbox transform. The
// nsDisplaySVGWrapper's reference frame is this frame, because this frame
// always returns true from IsSVGTransformed.
nsDisplayList newList(aBuilder);
nsDisplayListSet set(&newList, &newList, &newList, &newList, &newList,
&newList);
BuildDisplayListForNonBlockChildren(aBuilder, set);
aLists.Content()->AppendNewToTop<nsDisplaySVGWrapper>(aBuilder, this,
&newList);
}
static Matrix ComputeOuterSVGAnonChildFrameTransform(
const SVGOuterSVGAnonChildFrame* aFrame) {
// Our elements 'transform' attribute is applied to our SVGOuterSVGFrame
// parent, and the element's children-only transforms are applied to us, the
// anonymous child frame. Since we are the child frame, we apply the
// children-only transforms as if they are our own transform.
SVGSVGElement* content = static_cast<SVGSVGElement*>(aFrame->GetContent());
if (!content->HasChildrenOnlyTransform()) {
return Matrix();
}
// Outer-<svg> doesn't use x/y, so we can pass eChildToUserSpace here.
gfxMatrix ownMatrix =
content->PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace);
if (ownMatrix.HasNonTranslation()) {
// viewBox, currentScale and currentTranslate should only produce a
// rectilinear transform.
MOZ_ASSERT(ownMatrix.IsRectilinear(),
"Non-rectilinear transform will break the following logic");
// The nsDisplayTransform code will apply this transform to our frame,
// including to our frame position. We don't want our frame position to
// be scaled though, so we need to correct for that in the transform.
// XXX Yeah, this is a bit hacky.
CSSPoint pos = CSSPixel::FromAppUnits(aFrame->GetPosition());
CSSPoint scaledPos = CSSPoint(ownMatrix._11 * pos.x, ownMatrix._22 * pos.y);
CSSPoint deltaPos = scaledPos - pos;
ownMatrix *= gfxMatrix::Translation(-deltaPos.x, -deltaPos.y);
}
return gfx::ToMatrix(ownMatrix);
}
// We want this frame to be a reference frame. An easy way to achieve that is
// to always return true from this method, even for identity transforms.
// This frame being a reference frame ensures that the offset between this
// <svg> element and the parent reference frame is completely absorbed by the
// nsDisplayTransform that's created for this frame, and that this offset does
// not affect our descendants' transforms. Consequently, if the <svg> element
// moves, e.g. during scrolling, the transform matrices of our contents are
// unaffected. This simplifies invalidation.
bool SVGOuterSVGAnonChildFrame::IsSVGTransformed(
Matrix* aOwnTransform, Matrix* aFromParentTransform) const {
if (aOwnTransform) {
*aOwnTransform = ComputeOuterSVGAnonChildFrameTransform(this);
}
return true;
}
} // namespace mozilla
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