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gecko-dev/layout/svg/nsSVGOuterSVGFrame.cpp

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39 KiB
C++
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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 "nsSVGOuterSVGFrame.h"
// Keep others in (case-insensitive) order:
#include "gfxContext.h"
#include "nsDisplayList.h"
#include "mozilla/dom/Document.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIObjectLoadingContent.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGForeignObjectFrame.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "mozilla/dom/SVGViewElement.h"
#include "nsSubDocumentFrame.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
//----------------------------------------------------------------------
// Implementation helpers
void nsSVGOuterSVGFrame::RegisterForeignObject(
nsSVGForeignObjectFrame* aFrame) {
NS_ASSERTION(aFrame, "Who on earth is calling us?!");
if (!mForeignObjectHash) {
mForeignObjectHash =
new nsTHashtable<nsPtrHashKey<nsSVGForeignObjectFrame> >();
}
NS_ASSERTION(!mForeignObjectHash->GetEntry(aFrame),
"nsSVGForeignObjectFrame already registered!");
mForeignObjectHash->PutEntry(aFrame);
NS_ASSERTION(mForeignObjectHash->GetEntry(aFrame),
"Failed to register nsSVGForeignObjectFrame!");
}
void nsSVGOuterSVGFrame::UnregisterForeignObject(
nsSVGForeignObjectFrame* aFrame) {
NS_ASSERTION(aFrame, "Who on earth is calling us?!");
NS_ASSERTION(mForeignObjectHash && mForeignObjectHash->GetEntry(aFrame),
"nsSVGForeignObjectFrame not in registry!");
return mForeignObjectHash->RemoveEntry(aFrame);
}
//----------------------------------------------------------------------
// Implementation
nsContainerFrame* NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell)
nsSVGOuterSVGFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGOuterSVGFrame)
nsSVGOuterSVGFrame::nsSVGOuterSVGFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsSVGDisplayContainerFrame(aStyle, aPresContext, kClassID),
mCallingReflowSVG(false),
mFullZoom(PresContext()->GetFullZoom()),
mViewportInitialized(false),
mIsRootContent(false) {
// Outer-<svg> has CSS layout, so remove this bit:
RemoveStateBits(NS_FRAME_SVG_LAYOUT);
}
// helper
static inline bool DependsOnIntrinsicSize(const nsIFrame* aEmbeddingFrame) {
const nsStylePosition* pos = aEmbeddingFrame->StylePosition();
const auto& width = pos->mWidth;
const auto& height = pos->mHeight;
// XXX it would be nice to know if the size of aEmbeddingFrame's containing
// block depends on aEmbeddingFrame, then we'd know if we can return false
// for eStyleUnit_Percent too.
return !width.ConvertsToLength() || !height.ConvertsToLength();
}
void nsSVGOuterSVGFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svg),
"Content is not an SVG 'svg' element!");
AddStateBits(NS_STATE_IS_OUTER_SVG | NS_FRAME_FONT_INFLATION_CONTAINER |
NS_FRAME_FONT_INFLATION_FLOW_ROOT);
// Check for conditional processing attributes here rather than in
// nsCSSFrameConstructor::FindSVGData because we want to avoid
// simply giving failing outer <svg> elements an nsSVGContainerFrame.
// We don't create other SVG frames if PassesConditionalProcessingTests
// returns false, but since we do create nsSVGOuterSVGFrame 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.
SVGSVGElement* svg = static_cast<SVGSVGElement*>(aContent);
if (!svg->PassesConditionalProcessingTests()) {
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
nsSVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
Document* doc = mContent->GetUncomposedDoc();
if (doc) {
// we only care about our content's zoom and pan values if it's the root
// element
if (doc->GetRootElement() == mContent) {
mIsRootContent = true;
nsIFrame* embeddingFrame;
if (IsRootOfReplacedElementSubDoc(&embeddingFrame) && embeddingFrame) {
if (MOZ_UNLIKELY(!embeddingFrame->HasAllStateBits(NS_FRAME_IS_DIRTY)) &&
DependsOnIntrinsicSize(embeddingFrame)) {
// Looks like this document is loading after the embedding element
// has had its first reflow, and that its size depends on our
// intrinsic size. We need it to resize itself to use our (now
// available) intrinsic size:
embeddingFrame->PresShell()->FrameNeedsReflow(
embeddingFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
}
}
}
}
}
//----------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(nsSVGOuterSVGFrame)
NS_QUERYFRAME_ENTRY(nsISVGSVGFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGDisplayContainerFrame)
//----------------------------------------------------------------------
// nsIFrame methods
//----------------------------------------------------------------------
// reflowing
/* virtual */
nscoord nsSVGOuterSVGFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_MIN_INLINE_SIZE(this, result);
result = nscoord(0);
return result;
}
/* virtual */
nscoord nsSVGOuterSVGFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_PREF_INLINE_SIZE(this, result);
SVGSVGElement* svg = static_cast<SVGSVGElement*>(GetContent());
WritingMode wm = GetWritingMode();
const nsSVGLength2& isize =
wm.IsVertical() ? svg->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]
: svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
if (isize.IsPercentage()) {
// It looks like our containing block's isize may depend on our isize. In
// that case our behavior is undefined according to CSS 2.1 section 10.3.2.
// As a last resort, we'll fall back to returning zero.
result = nscoord(0);
// Returning zero may be unhelpful, however, as it leads to unexpected
// disappearance of %-sized SVGs in orthogonal contexts, where our
// containing block wants to shrink-wrap. So let's look for an ancestor
// with non-zero size in this dimension, and use that as a (somewhat
// arbitrary) result instead.
nsIFrame* parent = GetParent();
while (parent) {
nscoord parentISize = parent->GetLogicalSize(wm).ISize(wm);
if (parentISize > 0 && parentISize != NS_UNCONSTRAINEDSIZE) {
result = parentISize;
break;
}
parent = parent->GetParent();
}
} else {
result = nsPresContext::CSSPixelsToAppUnits(isize.GetAnimValue(svg));
if (result < 0) {
result = nscoord(0);
}
}
return result;
}
/* virtual */
IntrinsicSize nsSVGOuterSVGFrame::GetIntrinsicSize() {
// XXXjwatt Note that here we want to return the CSS width/height if they're
// specified and we're embedded inside an nsIObjectLoadingContent.
IntrinsicSize intrinsicSize;
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
const nsSVGLength2& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
const nsSVGLength2& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
if (!width.IsPercentage()) {
nscoord val =
nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content));
if (val < 0) val = 0;
intrinsicSize.width.SetCoordValue(val);
}
if (!height.IsPercentage()) {
nscoord val =
nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content));
if (val < 0) val = 0;
intrinsicSize.height.SetCoordValue(val);
}
return intrinsicSize;
}
/* virtual */
nsSize nsSVGOuterSVGFrame::GetIntrinsicRatio() {
// 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: http://www.w3.org/TR/SVGMobile12/coords.html#IntrinsicSizing
// Unfortunately we have to return the ratio as two nscoords whereas what
// we have are two floats. Using app units allows for some floating point
// values to work but really small or large numbers will fail.
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
const nsSVGLength2& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
const nsSVGLength2& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
if (!width.IsPercentage() && !height.IsPercentage()) {
nsSize ratio(
nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content)),
nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content)));
if (ratio.width < 0) {
ratio.width = 0;
}
if (ratio.height < 0) {
ratio.height = 0;
}
return ratio;
}
SVGViewElement* viewElement = content->GetCurrentViewElement();
const SVGViewBoxRect* viewbox = nullptr;
// The logic here should match HasViewBox().
if (viewElement && viewElement->mViewBox.HasRect()) {
viewbox = &viewElement->mViewBox.GetAnimValue();
} else if (content->mViewBox.HasRect()) {
viewbox = &content->mViewBox.GetAnimValue();
}
if (viewbox) {
float viewBoxWidth = viewbox->width;
float viewBoxHeight = viewbox->height;
if (viewBoxWidth < 0.0f) {
viewBoxWidth = 0.0f;
}
if (viewBoxHeight < 0.0f) {
viewBoxHeight = 0.0f;
}
return nsSize(nsPresContext::CSSPixelsToAppUnits(viewBoxWidth),
nsPresContext::CSSPixelsToAppUnits(viewBoxHeight));
}
return nsSVGDisplayContainerFrame::GetIntrinsicRatio();
}
/* virtual */
LogicalSize nsSVGOuterSVGFrame::ComputeSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorder, const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
if (IsRootOfImage() || IsRootOfReplacedElementSubDoc()) {
// 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;
}
LogicalSize cbSize = aCBSize;
IntrinsicSize intrinsicSize = GetIntrinsicSize();
if (!mContent->GetParent()) {
// 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(aWM) != NS_AUTOHEIGHT &&
aCBSize.BSize(aWM) != NS_AUTOHEIGHT,
"root should not have auto-width/height containing block");
cbSize.ISize(aWM) *= PresContext()->GetFullZoom();
cbSize.BSize(aWM) *= PresContext()->GetFullZoom();
// 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.)
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
const nsSVGLength2& width =
content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
if (width.IsPercentage()) {
MOZ_ASSERT(intrinsicSize.width.GetUnit() == eStyleUnit_None,
"GetIntrinsicSize should have reported no intrinsic width");
float val = width.GetAnimValInSpecifiedUnits() / 100.0f;
if (val < 0.0f) val = 0.0f;
intrinsicSize.width.SetCoordValue(val * cbSize.Width(aWM));
}
const nsSVGLength2& height =
content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
NS_ASSERTION(aCBSize.BSize(aWM) != NS_AUTOHEIGHT,
"root should not have auto-height containing block");
if (height.IsPercentage()) {
MOZ_ASSERT(intrinsicSize.height.GetUnit() == eStyleUnit_None,
"GetIntrinsicSize should have reported no intrinsic height");
float val = height.GetAnimValInSpecifiedUnits() / 100.0f;
if (val < 0.0f) val = 0.0f;
intrinsicSize.height.SetCoordValue(val * cbSize.Height(aWM));
}
MOZ_ASSERT(intrinsicSize.height.GetUnit() == eStyleUnit_Coord &&
intrinsicSize.width.GetUnit() == eStyleUnit_Coord,
"We should have just handled the only situation where"
"we lack an intrinsic height or width.");
}
return ComputeSizeWithIntrinsicDimensions(
aRenderingContext, aWM, intrinsicSize, GetIntrinsicRatio(), cbSize,
aMargin, aBorder, aPadding, aFlags);
}
void nsSVGOuterSVGFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsSVGOuterSVGFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_FRAME_TRACE(
NS_FRAME_TRACE_CALLS,
("enter nsSVGOuterSVGFrame::Reflow: availSize=%d,%d",
aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
MOZ_ASSERT(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
aDesiredSize.Width() =
aReflowInput.ComputedWidth() +
aReflowInput.ComputedPhysicalBorderPadding().LeftRight();
aDesiredSize.Height() =
aReflowInput.ComputedHeight() +
aReflowInput.ComputedPhysicalBorderPadding().TopBottom();
NS_ASSERTION(!GetPrevInFlow(), "SVG can't currently be broken across pages.");
SVGSVGElement* svgElem = static_cast<SVGSVGElement*>(GetContent());
nsSVGOuterSVGAnonChildFrame* anonKid =
static_cast<nsSVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
if (mState & 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
svgFloatSize newViewportSize(
nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedWidth()),
nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedHeight()));
svgFloatSize oldViewportSize = svgElem->GetViewportSize();
uint32_t changeBits = 0;
if (newViewportSize != oldViewportSize) {
// 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->AddStateBits(NS_FRAME_IS_DIRTY);
for (nsIFrame* child : anonChild->PrincipalChildList()) {
child->AddStateBits(NS_FRAME_IS_DIRTY);
}
}
changeBits |= COORD_CONTEXT_CHANGED;
svgElem->SetViewportSize(newViewportSize);
}
if (mFullZoom != PresContext()->GetFullZoom()) {
changeBits |= FULL_ZOOM_CHANGED;
mFullZoom = PresContext()->GetFullZoom();
}
if (changeBits) {
NotifyViewportOrTransformChanged(changeBits);
}
mViewportInitialized = true;
// 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 (GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
ReflowSVGNonDisplayText(this);
} else {
// Update the mRects and visual overflow rects of all our descendants,
// including our anonymous wrapper kid:
anonKid->AddStateBits(mState & NS_FRAME_IS_DIRTY);
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 visual 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 visual 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 visual 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.VisualOverflow().UnionRect(
aDesiredSize.mOverflowAreas.VisualOverflow(),
anonKid->GetVisualOverflowRect() + anonKid->GetPosition());
}
FinishAndStoreOverflow(&aDesiredSize);
}
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit nsSVGOuterSVGFrame::Reflow: size=%d,%d",
aDesiredSize.Width(), aDesiredSize.Height()));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
void nsSVGOuterSVGFrame::DidReflow(nsPresContext* aPresContext,
const ReflowInput* aReflowInput) {
nsSVGDisplayContainerFrame::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 nsSVGOuterSVGFrame::UnionChildOverflow(nsOverflowAreas& aOverflowAreas) {
// See the comments in Reflow above.
// WARNING!! Keep this in sync with Reflow above!
if (!mIsRootContent) {
nsIFrame* anonKid = PrincipalChildList().FirstChild();
aOverflowAreas.VisualOverflow().UnionRect(
aOverflowAreas.VisualOverflow(),
anonKid->GetVisualOverflowRect() + anonKid->GetPosition());
}
}
//----------------------------------------------------------------------
// container methods
/**
* Used to paint/hit-test SVG when SVG display lists are disabled.
*/
class nsDisplayOuterSVG final : public nsDisplayItem {
public:
nsDisplayOuterSVG(nsDisplayListBuilder* aBuilder, nsSVGOuterSVGFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayOuterSVG);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayOuterSVG() { MOZ_COUNT_DTOR(nsDisplayOuterSVG); }
#endif
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) override;
virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
virtual void ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const override;
nsDisplayItemGeometry* AllocateGeometry(
nsDisplayListBuilder* aBuilder) override {
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
}
NS_DISPLAY_DECL_NAME("SVGOuterSVG", TYPE_SVG_OUTER_SVG)
};
void nsDisplayOuterSVG::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
nsSVGOuterSVGFrame* outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(mFrame);
nsPoint refFrameToContentBox =
ToReferenceFrame() +
outerSVGFrame->GetContentRectRelativeToSelf().TopLeft();
nsPoint pointRelativeToContentBox =
nsPoint(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2) -
refFrameToContentBox;
gfxPoint svgViewportRelativePoint =
gfxPoint(pointRelativeToContentBox.x, pointRelativeToContentBox.y) /
AppUnitsPerCSSPixel();
nsSVGOuterSVGAnonChildFrame* anonKid =
static_cast<nsSVGOuterSVGAnonChildFrame*>(
outerSVGFrame->PrincipalChildList().FirstChild());
nsIFrame* frame =
nsSVGUtils::HitTestChildren(anonKid, svgViewportRelativePoint);
if (frame) {
aOutFrames->AppendElement(frame);
}
}
void nsDisplayOuterSVG::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aContext) {
#if defined(DEBUG) && defined(SVG_DEBUG_PAINT_TIMING)
PRTime start = PR_Now();
#endif
// Create an SVGAutoRenderState so we can call SetPaintingToWindow on it.
SVGAutoRenderState state(aContext->GetDrawTarget());
if (aBuilder->IsPaintingToWindow()) {
state.SetPaintingToWindow(true);
}
nsRect viewportRect =
mFrame->GetContentRectRelativeToSelf() + ToReferenceFrame();
nsRect clipRect = GetPaintRect().Intersect(viewportRect);
uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
nsIntRect contentAreaDirtyRect =
(clipRect - viewportRect.TopLeft()).ToOutsidePixels(appUnitsPerDevPixel);
gfxPoint devPixelOffset = nsLayoutUtils::PointToGfxPoint(
viewportRect.TopLeft(), appUnitsPerDevPixel);
aContext->Save();
imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
// We include the offset of our frame and a scale from device pixels to user
// units (i.e. CSS px) in the matrix that we pass to our children):
gfxMatrix tm = nsSVGUtils::GetCSSPxToDevPxMatrix(mFrame) *
gfxMatrix::Translation(devPixelOffset);
nsSVGUtils::PaintFrameWithEffects(mFrame, *aContext, tm, imgParams,
&contentAreaDirtyRect);
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, imgParams.result);
aContext->Restore();
#if defined(DEBUG) && defined(SVG_DEBUG_PAINT_TIMING)
PRTime end = PR_Now();
printf("SVG Paint Timing: %f ms\n", (end - start) / 1000.0);
#endif
}
nsRegion nsSVGOuterSVGFrame::FindInvalidatedForeignObjectFrameChildren(
nsIFrame* aFrame) {
nsRegion result;
if (mForeignObjectHash && mForeignObjectHash->Count()) {
for (auto it = mForeignObjectHash->Iter(); !it.Done(); it.Next()) {
result.Or(result, it.Get()->GetKey()->GetInvalidRegion());
}
}
return result;
}
void nsDisplayOuterSVG::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
nsSVGOuterSVGFrame* frame = static_cast<nsSVGOuterSVGFrame*>(mFrame);
frame->InvalidateSVG(frame->FindInvalidatedForeignObjectFrameChildren(frame));
nsRegion result = frame->GetInvalidRegion();
result.MoveBy(ToReferenceFrame());
frame->ClearInvalidRegion();
nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
aInvalidRegion->Or(*aInvalidRegion, result);
auto geometry =
static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
}
nsresult nsSVGOuterSVGFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (aNameSpaceID == kNameSpaceID_None &&
!(GetStateBits() & (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;
nsSVGUtils::NotifyChildrenOfSVGChange(
PrincipalChildList().FirstChild(),
aAttribute == nsGkAtoms::viewBox
? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED
: TRANSFORM_CHANGED);
if (aAttribute != nsGkAtoms::transform) {
static_cast<SVGSVGElement*>(GetContent())
->ChildrenOnlyTransformChanged();
}
} else if (aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height) {
// Don't call ChildrenOnlyTransformChanged() here, since we call it
// under Reflow if the width/height actually changed.
nsIFrame* embeddingFrame;
if (IsRootOfReplacedElementSubDoc(&embeddingFrame) && embeddingFrame) {
if (DependsOnIntrinsicSize(embeddingFrame)) {
// Tell embeddingFrame's presShell it needs to be reflowed (which
// takes care of reflowing us too).
embeddingFrame->PresShell()->FrameNeedsReflow(
embeddingFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
}
// else our width and height is overridden - don't reflow anything
} else {
// We are not embedded by reference, so our 'width' and 'height'
// attributes are not overridden - we need to reflow.
PresShell()->FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
}
}
return NS_OK;
}
bool nsSVGOuterSVGFrame::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 nsSVGOuterSVGFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
return;
}
DisplayBorderBackgroundOutline(aBuilder, aLists);
// Per-spec, we always clip root-<svg> even when 'overflow' has its initial
// value of 'visible'. See also the "visual overflow" comments in Reflow.
DisplayListClipState::AutoSaveRestore autoSR(aBuilder);
if (mIsRootContent || StyleDisplay()->IsScrollableOverflow()) {
autoSR.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
}
if ((aBuilder->IsForEventDelivery() &&
NS_SVGDisplayListHitTestingEnabled()) ||
(!aBuilder->IsForEventDelivery() && NS_SVGDisplayListPaintingEnabled())) {
nsDisplayList* contentList = aLists.Content();
nsDisplayListSet set(contentList, contentList, contentList, contentList,
contentList, contentList);
BuildDisplayListForNonBlockChildren(aBuilder, set);
} else if (IsVisibleForPainting() || !aBuilder->IsForPainting()) {
aLists.Content()->AppendToTop(
MakeDisplayItem<nsDisplayOuterSVG>(aBuilder, this));
}
}
//----------------------------------------------------------------------
// nsISVGSVGFrame methods:
void nsSVGOuterSVGFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) {
MOZ_ASSERT(aFlags && !(aFlags & ~(COORD_CONTEXT_CHANGED | TRANSFORM_CHANGED |
FULL_ZOOM_CHANGED)),
"Unexpected aFlags value");
// No point in doing anything when were not init'ed yet:
if (!mViewportInitialized) {
return;
}
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
if (aFlags & COORD_CONTEXT_CHANGED) {
if (content->HasViewBoxRect()) {
// 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 && !(mState & NS_FRAME_IS_NONDISPLAY)) {
uint32_t flags =
(mState & NS_FRAME_IN_REFLOW) ? SVGSVGElement::eDuringReflow : 0;
content->ChildrenOnlyTransformChanged(flags);
}
}
nsSVGUtils::NotifyChildrenOfSVGChange(PrincipalChildList().FirstChild(),
aFlags);
}
//----------------------------------------------------------------------
// nsSVGDisplayableFrame methods:
void nsSVGOuterSVGFrame::PaintSVG(gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams,
const nsIntRect* aDirtyRect) {
NS_ASSERTION(
PrincipalChildList().FirstChild()->IsSVGOuterSVGAnonChildFrame() &&
!PrincipalChildList().FirstChild()->GetNextSibling(),
"We should have a single, anonymous, child");
nsSVGOuterSVGAnonChildFrame* anonKid =
static_cast<nsSVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
anonKid->PaintSVG(aContext, aTransform, aImgParams, aDirtyRect);
}
SVGBBox nsSVGOuterSVGFrame::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.
nsSVGOuterSVGAnonChildFrame* anonKid =
static_cast<nsSVGOuterSVGAnonChildFrame*>(
PrincipalChildList().FirstChild());
return anonKid->GetBBoxContribution(aToBBoxUserspace, aFlags);
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods:
gfxMatrix nsSVGOuterSVGFrame::GetCanvasTM() {
if (!mCanvasTM) {
SVGSVGElement* content = static_cast<SVGSVGElement*>(GetContent());
float devPxPerCSSPx = 1.0f / PresContext()->AppUnitsToFloatCSSPixels(
PresContext()->AppUnitsPerDevPixel());
gfxMatrix tm = content->PrependLocalTransformsTo(
gfxMatrix::Scaling(devPxPerCSSPx, devPxPerCSSPx));
mCanvasTM = new gfxMatrix(tm);
}
return *mCanvasTM;
}
//----------------------------------------------------------------------
// Implementation helpers
bool nsSVGOuterSVGFrame::IsRootOfReplacedElementSubDoc(
nsIFrame** aEmbeddingFrame) {
if (!mContent->GetParent()) {
// Our content is the document element
nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell();
nsCOMPtr<nsPIDOMWindowOuter> window;
if (docShell) {
window = docShell->GetWindow();
}
if (window) {
RefPtr<Element> frameElement = window->GetFrameElement();
if (frameElement &&
frameElement->IsAnyOfHTMLElements(nsGkAtoms::object, nsGkAtoms::embed,
nsGkAtoms::iframe)) {
// Our document is inside an HTML 'object', 'embed' or 'iframe' element
if (aEmbeddingFrame) {
*aEmbeddingFrame = frameElement->GetPrimaryFrame();
NS_ASSERTION(*aEmbeddingFrame, "Yikes, no embedding frame!");
}
return true;
}
}
}
if (aEmbeddingFrame) {
*aEmbeddingFrame = nullptr;
}
return false;
}
bool nsSVGOuterSVGFrame::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 nsSVGOuterSVGFrame::VerticalScrollbarNotNeeded() const {
const nsSVGLength2& height =
static_cast<SVGSVGElement*>(GetContent())
->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
return height.IsPercentage() && height.GetBaseValInSpecifiedUnits() <= 100;
}
void nsSVGOuterSVGFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
nsIFrame* anonKid = PrincipalChildList().FirstChild();
MOZ_ASSERT(anonKid->IsSVGOuterSVGAnonChildFrame());
aResult.AppendElement(OwnedAnonBox(anonKid));
}
//----------------------------------------------------------------------
// Implementation of nsSVGOuterSVGAnonChildFrame
nsContainerFrame* NS_NewSVGOuterSVGAnonChildFrame(nsIPresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell)
nsSVGOuterSVGAnonChildFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGOuterSVGAnonChildFrame)
#ifdef DEBUG
void nsSVGOuterSVGAnonChildFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(aParent->IsSVGOuterSVGFrame(), "Unexpected parent");
nsSVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif
void nsSVGOuterSVGAnonChildFrame::BuildDisplayList(
nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) {
// Wrap our contents into an nsDisplaySVGWrapper.
// We wrap this frame instead of the nsSVGOuterSVGFrame 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;
nsDisplayListSet set(&newList, &newList, &newList, &newList, &newList,
&newList);
BuildDisplayListForNonBlockChildren(aBuilder, set);
aLists.Content()->AppendToTop(
MakeDisplayItem<nsDisplaySVGWrapper>(aBuilder, this, &newList));
}
static Matrix ComputeOuterSVGAnonChildFrameTransform(
const nsSVGOuterSVGAnonChildFrame* aFrame) {
// Our elements 'transform' attribute is applied to our nsSVGOuterSVGFrame
// 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 nsSVGOuterSVGAnonChildFrame::IsSVGTransformed(
Matrix* aOwnTransform, Matrix* aFromParentTransform) const {
if (aOwnTransform) {
*aOwnTransform = ComputeOuterSVGAnonChildFrameTransform(this);
}
return true;
}
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