Bug Summary

File:var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp
Warning:line 254, column 9
Value stored to 'subdocRootFrame' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name Unified_cpp_layout_generic4.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -ffp-contract=off -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/layout/generic -fcoverage-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/layout/generic -resource-dir /usr/lib/llvm-19/lib/clang/19 -include /var/lib/jenkins/workspace/firefox-scan-build/config/gcc_hidden.h -include /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mozilla-config.h -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/stl_wrappers -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/system_wrappers -U _FORTIFY_SOURCE -D _FORTIFY_SOURCE=2 -D DEBUG=1 -D MOZ_HAS_MOZGLUE -D MOZILLA_INTERNAL_API -D IMPL_LIBXUL -D MOZ_SUPPORT_LEAKCHECKING -D STATIC_EXPORTABLE_JS_API -I /var/lib/jenkins/workspace/firefox-scan-build/layout/generic -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/layout/generic -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/ipc/ipdl/_ipdlheaders -I /var/lib/jenkins/workspace/firefox-scan-build/ipc/chromium/src -I /var/lib/jenkins/workspace/firefox-scan-build/layout/base -I /var/lib/jenkins/workspace/firefox-scan-build/layout/forms -I /var/lib/jenkins/workspace/firefox-scan-build/layout/painting -I /var/lib/jenkins/workspace/firefox-scan-build/layout/style -I /var/lib/jenkins/workspace/firefox-scan-build/layout/tables -I /var/lib/jenkins/workspace/firefox-scan-build/layout/xul -I /var/lib/jenkins/workspace/firefox-scan-build/docshell/base -I /var/lib/jenkins/workspace/firefox-scan-build/dom/base -I /var/lib/jenkins/workspace/firefox-scan-build/dom/html -I /var/lib/jenkins/workspace/firefox-scan-build/dom/xul -I /var/lib/jenkins/workspace/firefox-scan-build/gfx/cairo/cairo/src -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nspr -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nss -D MOZILLA_CLIENT -I /usr/include/gtk-3.0 -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/gio-unix-2.0 -I /usr/include/cloudproviders -I /usr/include/atk-1.0 -I /usr/include/at-spi2-atk/2.0 -I /usr/include/at-spi-2.0 -I /usr/include/dbus-1.0 -I /usr/lib/x86_64-linux-gnu/dbus-1.0/include -I /usr/include/gtk-3.0/unix-print -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward -internal-isystem /usr/lib/llvm-19/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-error=tautological-type-limit-compare -Wno-invalid-offsetof -Wno-range-loop-analysis -Wno-deprecated-anon-enum-enum-conversion -Wno-deprecated-enum-enum-conversion -Wno-deprecated-this-capture -Wno-inline-new-delete -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=free-nonheap-object -Wno-error=atomic-alignment -Wno-error=deprecated-builtins -Wno-psabi -Wno-error=builtin-macro-redefined -Wno-vla-cxx-extension -Wno-unknown-warning-option -fdeprecated-macro -ferror-limit 19 -fstrict-flex-arrays=1 -stack-protector 2 -fstack-clash-protection -ftrivial-auto-var-init=pattern -fno-rtti -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fno-sized-deallocation -fno-aligned-allocation -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2024-09-22-115206-3586786-1 -x c++ Unified_cpp_layout_generic4.cpp
1/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2/* vim: set ts=8 sts=2 et sw=2 tw=80: */
3/* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7/*
8 * rendering object for replaced elements that contain a document, such
9 * as <frame>, <iframe>, and some <object>s
10 */
11
12#include "nsSubDocumentFrame.h"
13
14#include "mozilla/ComputedStyleInlines.h"
15#include "mozilla/Preferences.h"
16#include "mozilla/PresShell.h"
17#include "mozilla/ScrollContainerFrame.h"
18#include "mozilla/StaticPrefs_layout.h"
19#include "mozilla/Unused.h"
20#include "mozilla/dom/Document.h"
21#include "mozilla/dom/HTMLFrameElement.h"
22#include "mozilla/dom/ImageDocument.h"
23#include "mozilla/dom/BrowserParent.h"
24#include "mozilla/dom/RemoteBrowser.h"
25
26#include "nsCOMPtr.h"
27#include "nsGenericHTMLElement.h"
28#include "nsGenericHTMLFrameElement.h"
29#include "nsAttrValueInlines.h"
30#include "nsIDocShell.h"
31#include "nsIDocumentViewer.h"
32#include "nsIContentInlines.h"
33#include "nsPresContext.h"
34#include "nsView.h"
35#include "nsViewManager.h"
36#include "nsGkAtoms.h"
37#include "nsStyleConsts.h"
38#include "nsStyleStruct.h"
39#include "nsStyleStructInlines.h"
40#include "nsFrameSetFrame.h"
41#include "nsNameSpaceManager.h"
42#include "nsDisplayList.h"
43#include "nsIObjectLoadingContent.h"
44#include "nsLayoutUtils.h"
45#include "nsContentUtils.h"
46#include "nsServiceManagerUtils.h"
47#include "nsQueryObject.h"
48#include "RetainedDisplayListBuilder.h"
49#include "nsObjectLoadingContent.h"
50
51#include "mozilla/layers/WebRenderUserData.h"
52#include "mozilla/layers/WebRenderScrollData.h"
53#include "mozilla/layers/RenderRootStateManager.h"
54#include "mozilla/layers/StackingContextHelper.h" // for StackingContextHelper
55#include "mozilla/ProfilerLabels.h"
56
57using namespace mozilla;
58using namespace mozilla::dom;
59using namespace mozilla::gfx;
60using namespace mozilla::layers;
61
62static Document* GetDocumentFromView(nsView* aView) {
63 MOZ_ASSERT(aView, "null view")do { static_assert( mozilla::detail::AssertionConditionType<
decltype(aView)>::isValid, "invalid assertion condition");
if ((__builtin_expect(!!(!(!!(aView))), 0))) { do { } while (
false); MOZ_ReportAssertionFailure("aView" " (" "null view" ")"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 63); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aView" ") (" "null view"
")"); do { *((volatile int*)__null) = 63; __attribute__((nomerge
)) ::abort(); } while (false); } } while (false);
64
65 nsViewManager* vm = aView->GetViewManager();
66 PresShell* presShell = vm ? vm->GetPresShell() : nullptr;
67 return presShell ? presShell->GetDocument() : nullptr;
68}
69
70static void PropagateIsUnderHiddenEmbedderElement(nsFrameLoader* aFrameLoader,
71 bool aValue) {
72 if (!aFrameLoader) {
73 return;
74 }
75
76 if (BrowsingContext* bc = aFrameLoader->GetExtantBrowsingContext()) {
77 if (bc->IsUnderHiddenEmbedderElement() != aValue) {
78 Unused << bc->SetIsUnderHiddenEmbedderElement(aValue);
79 }
80 }
81}
82
83nsSubDocumentFrame::nsSubDocumentFrame(ComputedStyle* aStyle,
84 nsPresContext* aPresContext)
85 : nsAtomicContainerFrame(aStyle, aPresContext, kClassID),
86 mOuterView(nullptr),
87 mInnerView(nullptr),
88 mIsInline(false),
89 mPostedReflowCallback(false),
90 mDidCreateDoc(false),
91 mCallingShow(false),
92 mIsInObjectOrEmbed(false) {}
93
94#ifdef ACCESSIBILITY1
95a11y::AccType nsSubDocumentFrame::AccessibleType() {
96 return a11y::eOuterDocType;
97}
98#endif
99
100NS_QUERYFRAME_HEAD(nsSubDocumentFrame)void* nsSubDocumentFrame ::QueryFrame(FrameIID id) const { switch
(id) {
101 NS_QUERYFRAME_ENTRY(nsSubDocumentFrame)case nsSubDocumentFrame ::kFrameIID: { static_assert( std::is_same_v
<nsSubDocumentFrame, nsSubDocumentFrame ::Has_NS_DECL_QUERYFRAME_TARGET
>, "nsSubDocumentFrame" " must declare itself as a queryframe target"
); return const_cast<nsSubDocumentFrame*>(static_cast<
const nsSubDocumentFrame*>(this)); }
102NS_QUERYFRAME_TAIL_INHERITING(nsAtomicContainerFrame)default: break; } return nsAtomicContainerFrame ::QueryFrame(
id); }
103
104class AsyncFrameInit : public Runnable {
105 public:
106 explicit AsyncFrameInit(nsIFrame* aFrame)
107 : mozilla::Runnable("AsyncFrameInit"), mFrame(aFrame) {}
108 NS_IMETHODvirtual nsresult Run() override {
109 AUTO_PROFILER_LABEL("AsyncFrameInit::Run", OTHER)mozilla::AutoProfilerLabel raiiObject109( "AsyncFrameInit::Run"
, nullptr, JS::ProfilingCategoryPair::OTHER);
110 if (mFrame.IsAlive()) {
111 static_cast<nsSubDocumentFrame*>(mFrame.GetFrame())->ShowViewer();
112 }
113 return NS_OK;
114 }
115
116 private:
117 WeakFrame mFrame;
118};
119
120void nsSubDocumentFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
121 nsIFrame* aPrevInFlow) {
122 MOZ_ASSERT(aContent)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(aContent)>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(aContent))), 0))) { do { } while
(false); MOZ_ReportAssertionFailure("aContent", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 122); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aContent" ")"
); do { *((volatile int*)__null) = 122; __attribute__((nomerge
)) ::abort(); } while (false); } } while (false);
123 // determine if we are a <frame> or <iframe>
124 mIsInline = !aContent->IsHTMLElement(nsGkAtoms::frame);
125
126 nsAtomicContainerFrame::Init(aContent, aParent, aPrevInFlow);
127
128 // CreateView() creates this frame's view, stored in mOuterView. It needs to
129 // be created first since it's the parent of the inner view, stored in
130 // mInnerView.
131 CreateView();
132 EnsureInnerView();
133
134 // Set the primary frame now so that nsDocumentViewer::FindContainerView
135 // called from within EndSwapDocShellsForViews below can find it if needed.
136 aContent->SetPrimaryFrame(this);
137
138 // If we have a detached subdoc's root view on our frame loader, re-insert it
139 // into the view tree. This happens when we've been reframed, and ensures the
140 // presentation persists across reframes.
141 if (RefPtr<nsFrameLoader> frameloader = FrameLoader()) {
142 bool hadFrame = false;
143 nsIFrame* detachedFrame = frameloader->GetDetachedSubdocFrame(&hadFrame);
144 frameloader->SetDetachedSubdocFrame(nullptr);
145 nsView* detachedView = detachedFrame ? detachedFrame->GetView() : nullptr;
146 if (detachedView) {
147 // Restore stashed presentation.
148 InsertViewsInReverseOrder(detachedView, mInnerView);
149 EndSwapDocShellsForViews(mInnerView->GetFirstChild());
150 } else if (hadFrame) {
151 // Presentation is for a different document, don't restore it.
152 frameloader->Hide();
153 }
154 }
155
156 // NOTE: The frame loader might not yet be initialized yet. If it's not, the
157 // call in ShowViewer() should pick things up.
158 UpdateEmbeddedBrowsingContextDependentData();
159 nsContentUtils::AddScriptRunner(new AsyncFrameInit(this));
160}
161
162void nsSubDocumentFrame::UpdateEmbeddedBrowsingContextDependentData() {
163 if (!mFrameLoader) {
164 return;
165 }
166 BrowsingContext* bc = mFrameLoader->GetExtantBrowsingContext();
167 if (!bc) {
168 return;
169 }
170 mIsInObjectOrEmbed = bc->IsEmbedderTypeObjectOrEmbed();
171 MaybeUpdateRemoteStyle();
172 MaybeUpdateEmbedderColorScheme();
173 PropagateIsUnderHiddenEmbedderElement(
174 PresShell()->IsUnderHiddenEmbedderElement() ||
175 !StyleVisibility()->IsVisible());
176}
177
178void nsSubDocumentFrame::PropagateIsUnderHiddenEmbedderElement(bool aValue) {
179 ::PropagateIsUnderHiddenEmbedderElement(mFrameLoader, aValue);
180}
181
182void nsSubDocumentFrame::ShowViewer() {
183 if (mCallingShow) {
184 return;
185 }
186
187 RefPtr<nsFrameLoader> frameloader = FrameLoader();
188 if (!frameloader || frameloader->IsDead()) {
189 return;
190 }
191
192 if (!frameloader->IsRemoteFrame() && !PresContext()->IsDynamic()) {
193 // We let the printing code take care of loading the document and
194 // initializing the shell; just create the inner view for it to use.
195 (void)EnsureInnerView();
196 } else {
197 AutoWeakFrame weakThis(this);
198 mCallingShow = true;
199 bool didCreateDoc = frameloader->Show(this);
200 if (!weakThis.IsAlive()) {
201 return;
202 }
203 mCallingShow = false;
204 mDidCreateDoc = didCreateDoc;
205 if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
206 frameloader->UpdatePositionAndSize(this);
207 }
208 if (!weakThis.IsAlive()) {
209 return;
210 }
211 UpdateEmbeddedBrowsingContextDependentData();
212 InvalidateFrame();
213 }
214}
215
216nsIFrame* nsSubDocumentFrame::GetSubdocumentRootFrame() {
217 if (!mInnerView) return nullptr;
218 nsView* subdocView = mInnerView->GetFirstChild();
219 return subdocView ? subdocView->GetFrame() : nullptr;
220}
221
222mozilla::PresShell* nsSubDocumentFrame::GetSubdocumentPresShellForPainting(
223 uint32_t aFlags) {
224 if (!mInnerView) return nullptr;
225
226 nsView* subdocView = mInnerView->GetFirstChild();
227 if (!subdocView) return nullptr;
228
229 mozilla::PresShell* presShell = nullptr;
230
231 nsIFrame* subdocRootFrame = subdocView->GetFrame();
232 if (subdocRootFrame) {
233 presShell = subdocRootFrame->PresShell();
234 }
235
236 // If painting is suppressed in the presshell, we try to look for a better
237 // presshell to use.
238 if (!presShell || (presShell->IsPaintingSuppressed() &&
239 !(aFlags & IGNORE_PAINT_SUPPRESSION))) {
240 // During page transition mInnerView will sometimes have two children, the
241 // first being the new page that may not have any frame, and the second
242 // being the old page that will probably have a frame.
243 nsView* nextView = subdocView->GetNextSibling();
244 nsIFrame* frame = nullptr;
245 if (nextView) {
246 frame = nextView->GetFrame();
247 }
248 if (frame) {
249 mozilla::PresShell* presShellForNextView = frame->PresShell();
250 if (!presShell || (presShellForNextView &&
251 !presShellForNextView->IsPaintingSuppressed() &&
252 StaticPrefs::layout_show_previous_page())) {
253 subdocView = nextView;
254 subdocRootFrame = frame;
Value stored to 'subdocRootFrame' is never read
255 presShell = presShellForNextView;
256 }
257 }
258 if (!presShell) {
259 // If we don't have a frame we use this roundabout way to get the pres
260 // shell.
261 if (!mFrameLoader) return nullptr;
262 nsIDocShell* docShell = mFrameLoader->GetDocShell(IgnoreErrors());
263 if (!docShell) return nullptr;
264 presShell = docShell->GetPresShell();
265 }
266 }
267
268 return presShell;
269}
270
271nsRect nsSubDocumentFrame::GetDestRect() {
272 nsRect rect = GetContent()->IsHTMLElement(nsGkAtoms::frame)
273 ? GetRectRelativeToSelf()
274 : GetContentRectRelativeToSelf();
275 return GetDestRect(rect);
276}
277
278nsRect nsSubDocumentFrame::GetDestRect(const nsRect& aConstraintRect) {
279 // Adjust subdocument size, according to 'object-fit' and the subdocument's
280 // intrinsic size and ratio.
281 return nsLayoutUtils::ComputeObjectDestRect(
282 aConstraintRect, ComputeIntrinsicSize(/* aIgnoreContainment = */ true),
283 GetIntrinsicRatio(), StylePosition());
284}
285
286ScreenIntSize nsSubDocumentFrame::GetSubdocumentSize() {
287 if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
288 if (RefPtr<nsFrameLoader> frameloader = FrameLoader()) {
289 nsIFrame* detachedFrame = frameloader->GetDetachedSubdocFrame();
290 if (nsView* view = detachedFrame ? detachedFrame->GetView() : nullptr) {
291 nsSize size = view->GetBounds().Size();
292 nsPresContext* presContext = detachedFrame->PresContext();
293 return ScreenIntSize(presContext->AppUnitsToDevPixels(size.width),
294 presContext->AppUnitsToDevPixels(size.height));
295 }
296 }
297 // Pick some default size for now. Using 10x10 because that's what the
298 // code used to do.
299 return ScreenIntSize(10, 10);
300 }
301
302 nsSize docSizeAppUnits = GetDestRect().Size();
303 nsPresContext* pc = PresContext();
304 return ScreenIntSize(pc->AppUnitsToDevPixels(docSizeAppUnits.width),
305 pc->AppUnitsToDevPixels(docSizeAppUnits.height));
306}
307
308static void WrapBackgroundColorInOwnLayer(nsDisplayListBuilder* aBuilder,
309 nsIFrame* aFrame,
310 nsDisplayList* aList) {
311 for (nsDisplayItem* item : aList->TakeItems()) {
312 if (item->GetType() == DisplayItemType::TYPE_BACKGROUND_COLOR) {
313 nsDisplayList tmpList(aBuilder);
314 tmpList.AppendToTop(item);
315 item = MakeDisplayItemWithIndex<nsDisplayOwnLayer>(
316 aBuilder, aFrame, /* aIndex = */ nsDisplayOwnLayer::OwnLayerForSubdoc,
317 &tmpList, aBuilder->CurrentActiveScrolledRoot(),
318 nsDisplayOwnLayerFlags::None, ScrollbarData{}, true, false);
319 }
320 aList->AppendToTop(item);
321 }
322}
323
324void nsSubDocumentFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
325 const nsDisplayListSet& aLists) {
326 if (!IsVisibleForPainting()) {
327 return;
328 }
329
330 const bool forEvents = aBuilder->IsForEventDelivery();
331 if (forEvents && Style()->PointerEvents() == StylePointerEvents::None) {
332 // If we are pointer-events:none then we don't need to HitTest background or
333 // anything else.
334 return;
335 }
336
337 nsFrameLoader* frameLoader = FrameLoader();
338 const bool isRemoteFrame = frameLoader && frameLoader->IsRemoteFrame();
339
340 nsDisplayListCollection decorations(aBuilder);
341 DisplayBorderBackgroundOutline(aBuilder, decorations);
342 if (isRemoteFrame) {
343 // Wrap background colors of <iframe>s with remote subdocuments in their
344 // own layer so we generate a ColorLayer. This is helpful for optimizing
345 // compositing; we can skip compositing the ColorLayer when the
346 // remote content is opaque.
347 WrapBackgroundColorInOwnLayer(aBuilder, this,
348 decorations.BorderBackground());
349 }
350 decorations.MoveTo(aLists);
351
352 if (forEvents && !ContentReactsToPointerEvents()) {
353 return;
354 }
355
356 if (HidesContent()) {
357 return;
358 }
359
360 // If we're passing pointer events to children then we have to descend into
361 // subdocuments no matter what, to determine which parts are transparent for
362 // hit-testing or event regions.
363 if (!mInnerView || !aBuilder->GetDescendIntoSubdocuments()) {
364 return;
365 }
366
367 if (isRemoteFrame) {
368 // We're the subdoc for <browser remote="true"> and it has
369 // painted content. Display its shadow layer tree.
370 DisplayListClipState::AutoSaveRestore clipState(aBuilder);
371 clipState.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
372
373 aLists.Content()->AppendNewToTop<nsDisplayRemote>(aBuilder, this);
374 return;
375 }
376
377 RefPtr<mozilla::PresShell> presShell = GetSubdocumentPresShellForPainting(
378 aBuilder->IsIgnoringPaintSuppression() ? IGNORE_PAINT_SUPPRESSION : 0);
379
380 if (!presShell) {
381 return;
382 }
383
384 if (aBuilder->IsInFilter()) {
385 Document* outerDoc = PresShell()->GetDocument();
386 Document* innerDoc = presShell->GetDocument();
387 if (outerDoc && innerDoc) {
388 if (!outerDoc->NodePrincipal()->Equals(innerDoc->NodePrincipal())) {
389 outerDoc->SetUseCounter(eUseCounter_custom_FilteredCrossOriginIFrame);
390 }
391 }
392 }
393
394 nsIFrame* subdocRootFrame = presShell->GetRootFrame();
395
396 nsPresContext* presContext = presShell->GetPresContext();
397
398 int32_t parentAPD = PresContext()->AppUnitsPerDevPixel();
399 int32_t subdocAPD = presContext->AppUnitsPerDevPixel();
400
401 nsRect visible;
402 nsRect dirty;
403 bool ignoreViewportScrolling = false;
404 if (subdocRootFrame) {
405 // get the dirty rect relative to the root frame of the subdoc
406 visible = aBuilder->GetVisibleRect() + GetOffsetToCrossDoc(subdocRootFrame);
407 dirty = aBuilder->GetDirtyRect() + GetOffsetToCrossDoc(subdocRootFrame);
408 // and convert into the appunits of the subdoc
409 visible = visible.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
410 dirty = dirty.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
411
412 if (ScrollContainerFrame* sf = presShell->GetRootScrollContainerFrame()) {
413 // Use a copy, so the rects don't get modified.
414 nsRect copyOfDirty = dirty;
415 nsRect copyOfVisible = visible;
416 // TODO(botond): Can we just axe this DecideScrollableLayer call?
417 sf->DecideScrollableLayer(aBuilder, &copyOfVisible, &copyOfDirty,
418 /* aSetBase = */ true);
419
420 ignoreViewportScrolling = presShell->IgnoringViewportScrolling();
421 }
422
423 aBuilder->EnterPresShell(subdocRootFrame, !ContentReactsToPointerEvents());
424 aBuilder->IncrementPresShellPaintCount(presShell);
425 } else {
426 visible = aBuilder->GetVisibleRect();
427 dirty = aBuilder->GetDirtyRect();
428 }
429
430 DisplayListClipState::AutoSaveRestore clipState(aBuilder);
431 clipState.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
432
433 ScrollContainerFrame* sf = presShell->GetRootScrollContainerFrame();
434 bool constructZoomItem = subdocRootFrame && parentAPD != subdocAPD;
435 bool needsOwnLayer = constructZoomItem ||
436 presContext->IsRootContentDocumentCrossProcess() ||
437 (sf && sf->IsScrollingActive());
438
439 nsDisplayList childItems(aBuilder);
440
441 {
442 DisplayListClipState::AutoSaveRestore nestedClipState(aBuilder);
443 if (needsOwnLayer) {
444 // Clear current clip. There's no point in propagating it down, since
445 // the layer we will construct will be clipped by the current clip.
446 // In fact for nsDisplayZoom propagating it down would be incorrect since
447 // nsDisplayZoom changes the meaning of appunits.
448 nestedClipState.Clear();
449 }
450
451 // Invoke AutoBuildingDisplayList to ensure that the correct dirty rect
452 // is used to compute the visible rect if AddCanvasBackgroundColorItem
453 // creates a display item.
454 nsIFrame* frame = subdocRootFrame ? subdocRootFrame : this;
455 nsDisplayListBuilder::AutoBuildingDisplayList building(aBuilder, frame,
456 visible, dirty);
457
458 if (subdocRootFrame) {
459 bool hasDocumentLevelListenersForApzAwareEvents =
460 gfxPlatform::AsyncPanZoomEnabled() &&
461 nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(presShell);
462
463 aBuilder->SetAncestorHasApzAwareEventHandler(
464 hasDocumentLevelListenersForApzAwareEvents);
465 subdocRootFrame->BuildDisplayListForStackingContext(aBuilder,
466 &childItems);
467 if (!aBuilder->IsForEventDelivery()) {
468 // If we are going to use a displayzoom below then any items we put
469 // under it need to have underlying frames from the subdocument. So we
470 // need to calculate the bounds based on which frame will be the
471 // underlying frame for the canvas background color item.
472 nsRect bounds =
473 GetContentRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
474 bounds = bounds.ScaleToOtherAppUnitsRoundOut(parentAPD, subdocAPD);
475
476 // Add the canvas background color to the bottom of the list. This
477 // happens after we've built the list so that
478 // AddCanvasBackgroundColorItem can monkey with the contents if
479 // necessary.
480 presShell->AddCanvasBackgroundColorItem(aBuilder, &childItems, frame,
481 bounds, NS_RGBA(0, 0, 0, 0)((nscolor)(((0) << 24) | ((0) << 16) | ((0) <<
8) | (0))));
482 }
483 }
484 }
485
486 if (subdocRootFrame) {
487 aBuilder->LeavePresShell(subdocRootFrame, &childItems);
488 }
489
490 // Generate a resolution and/or zoom item if needed. If one or both of those
491 // is created, we don't need to create a separate nsDisplaySubDocument.
492
493 nsDisplayOwnLayerFlags flags =
494 nsDisplayOwnLayerFlags::GenerateSubdocInvalidations;
495 // If ignoreViewportScrolling is true then the top most layer we create here
496 // is going to become the scrollable layer for the root scroll frame, so we
497 // want to add nsDisplayOwnLayer::GENERATE_SCROLLABLE_LAYER to whatever layer
498 // becomes the topmost. We do this below.
499 if (constructZoomItem) {
500 nsDisplayOwnLayerFlags zoomFlags = flags;
501 if (ignoreViewportScrolling) {
502 zoomFlags |= nsDisplayOwnLayerFlags::GenerateScrollableLayer;
503 }
504 childItems.AppendNewToTop<nsDisplayZoom>(aBuilder, subdocRootFrame, this,
505 &childItems, subdocAPD, parentAPD,
506 zoomFlags);
507
508 needsOwnLayer = false;
509 }
510 // Wrap the zoom item in the resolution item if we have both because we want
511 // the resolution scale applied on top of the app units per dev pixel
512 // conversion.
513 if (ignoreViewportScrolling) {
514 flags |= nsDisplayOwnLayerFlags::GenerateScrollableLayer;
515 }
516
517 // We always want top level content documents to be in their own layer.
518 nsDisplaySubDocument* layerItem = MakeDisplayItem<nsDisplaySubDocument>(
519 aBuilder, subdocRootFrame ? subdocRootFrame : this, this, &childItems,
520 flags);
521 if (layerItem) {
522 childItems.AppendToTop(layerItem);
523 layerItem->SetShouldFlattenAway(!needsOwnLayer);
524 }
525
526 if (aBuilder->IsForFrameVisibility()) {
527 // We don't add the childItems to the return list as we're dealing with them
528 // here.
529 presShell->RebuildApproximateFrameVisibilityDisplayList(childItems);
530 childItems.DeleteAll(aBuilder);
531 } else {
532 aLists.Content()->AppendToTop(&childItems);
533 }
534}
535
536#ifdef DEBUG_FRAME_DUMP1
537void nsSubDocumentFrame::List(FILE* out, const char* aPrefix,
538 ListFlags aFlags) const {
539 nsCString str;
540 ListGeneric(str, aPrefix, aFlags);
541 fprintf_stderr(out, "%s\n", str.get());
542
543 if (aFlags.contains(ListFlag::TraverseSubdocumentFrames)) {
544 nsSubDocumentFrame* f = const_cast<nsSubDocumentFrame*>(this);
545 nsIFrame* subdocRootFrame = f->GetSubdocumentRootFrame();
546 if (subdocRootFrame) {
547 nsCString pfx(aPrefix);
548 pfx += " ";
549 subdocRootFrame->List(out, pfx.get(), aFlags);
550 }
551 }
552}
553
554nsresult nsSubDocumentFrame::GetFrameName(nsAString& aResult) const {
555 return MakeFrameName(u"FrameOuter"_ns, aResult);
556}
557#endif
558
559nscoord nsSubDocumentFrame::IntrinsicISize(const IntrinsicSizeInput& aInput,
560 IntrinsicISizeType aType) {
561 // Note: when computing max-content inline size (i.e. when aType is
562 // IntrinsicISizeType::PrefISize), if the subdocument is an SVG document, then
563 // in theory we want to return the same value that SVGOuterSVGFrame does. That
564 // method has some special handling of percentage values to avoid unhelpful
565 // zero sizing in the presence of orthogonal writing modes. We don't bother
566 // with that for SVG documents in <embed> and <object>, since that special
567 // handling doesn't look up across document boundaries anyway.
568 return GetIntrinsicSize().ISize(GetWritingMode()).valueOr(0);
569}
570
571/* virtual */
572IntrinsicSize nsSubDocumentFrame::GetIntrinsicSize() {
573 return ComputeIntrinsicSize();
574}
575
576IntrinsicSize nsSubDocumentFrame::ComputeIntrinsicSize(
577 bool aIgnoreContainment) const {
578 const auto containAxes =
579 aIgnoreContainment ? ContainSizeAxes(false, false) : GetContainSizeAxes();
580 if (containAxes.IsBoth()) {
581 // Intrinsic size of 'contain:size' replaced elements is determined by
582 // contain-intrinsic-size.
583 return FinishIntrinsicSize(containAxes, IntrinsicSize(0, 0));
584 }
585
586 if (nsCOMPtr<nsIObjectLoadingContent> iolc = do_QueryInterface(mContent)) {
587 const auto* olc = static_cast<nsObjectLoadingContent*>(iolc.get());
588 if (auto size = olc->GetSubdocumentIntrinsicSize()) {
589 // Use the intrinsic size from the child SVG document, if available.
590 return FinishIntrinsicSize(containAxes, *size);
591 }
592 }
593
594 if (!IsInline()) {
595 return {}; // <frame> elements have no useful intrinsic size.
596 }
597
598 if (mContent->IsXULElement()) {
599 return {}; // XUL <iframe> and <browser> have no useful intrinsic size
600 }
601
602 // We must be an HTML <iframe>. Return fallback size.
603 return FinishIntrinsicSize(containAxes,
604 IntrinsicSize(kFallbackIntrinsicSize));
605}
606
607/* virtual */
608AspectRatio nsSubDocumentFrame::GetIntrinsicRatio() const {
609 // FIXME(emilio): This should probably respect contain: size and return no
610 // ratio in the case subDocRoot is non-null. Otherwise we do it by virtue of
611 // using a zero-size below and reusing GetIntrinsicSize().
612 if (nsCOMPtr<nsIObjectLoadingContent> iolc = do_QueryInterface(mContent)) {
613 auto olc = static_cast<nsObjectLoadingContent*>(iolc.get());
614
615 auto ratio = olc->GetSubdocumentIntrinsicRatio();
616 if (ratio && *ratio) {
617 // Use the intrinsic aspect ratio from the child SVG document, if
618 // available.
619 return *ratio;
620 }
621 }
622
623 // NOTE(emilio): Even though we have an intrinsic size, we may not have an
624 // intrinsic ratio. For example `<iframe style="width: 100px">` should not
625 // shrink in the vertical axis to preserve the 300x150 ratio.
626 return nsAtomicContainerFrame::GetIntrinsicRatio();
627}
628
629/* virtual */
630nsIFrame::SizeComputationResult nsSubDocumentFrame::ComputeSize(
631 gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
632 nscoord aAvailableISize, const LogicalSize& aMargin,
633 const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
634 ComputeSizeFlags aFlags) {
635 return {ComputeSizeWithIntrinsicDimensions(
636 aRenderingContext, aWM, GetIntrinsicSize(), GetAspectRatio(),
637 aCBSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
638 AspectRatioUsage::None};
639}
640
641void nsSubDocumentFrame::Reflow(nsPresContext* aPresContext,
642 ReflowOutput& aDesiredSize,
643 const ReflowInput& aReflowInput,
644 nsReflowStatus& aStatus) {
645 MarkInReflow();
646 DO_GLOBAL_REFLOW_COUNT("nsSubDocumentFrame")aPresContext->CountReflows(("nsSubDocumentFrame"), (nsIFrame
*)this);;
647 MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!")do { static_assert( mozilla::detail::AssertionConditionType<
decltype(aStatus.IsEmpty())>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(aStatus.IsEmpty()))), 0))) {
do { } while (false); MOZ_ReportAssertionFailure("aStatus.IsEmpty()"
" (" "Caller should pass a fresh reflow status!" ")", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 647); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aStatus.IsEmpty()"
") (" "Caller should pass a fresh reflow status!" ")"); do {
*((volatile int*)__null) = 647; __attribute__((nomerge)) ::abort
(); } while (false); } } while (false);
648 NS_FRAME_TRACE(do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d"
, aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight
()); } } while (0)
649 NS_FRAME_TRACE_CALLS,do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d"
, aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight
()); } } while (0)
650 ("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d",do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d"
, aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight
()); } } while (0)
651 aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()))do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("enter nsSubDocumentFrame::Reflow: maxSize=%d,%d"
, aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight
()); } } while (0);
652
653 NS_ASSERTION(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE,do { if (!(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained inline-size here "
"thanks to the rules of reflow", "aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 655); MOZ_PretendNoReturn(); } } while (0)
654 "Shouldn't have unconstrained inline-size here "do { if (!(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained inline-size here "
"thanks to the rules of reflow", "aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 655); MOZ_PretendNoReturn(); } } while (0)
655 "thanks to the rules of reflow")do { if (!(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained inline-size here "
"thanks to the rules of reflow", "aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 655); MOZ_PretendNoReturn(); } } while (0);
656 NS_ASSERTION(aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE,do { if (!(aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained block-size here "
"thanks to ComputeAutoSize", "aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 658); MOZ_PretendNoReturn(); } } while (0)
657 "Shouldn't have unconstrained block-size here "do { if (!(aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained block-size here "
"thanks to ComputeAutoSize", "aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 658); MOZ_PretendNoReturn(); } } while (0)
658 "thanks to ComputeAutoSize")do { if (!(aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE
)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Shouldn't have unconstrained block-size here "
"thanks to ComputeAutoSize", "aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 658); MOZ_PretendNoReturn(); } } while (0);
659
660 NS_ASSERTION(mContent->GetPrimaryFrame() == this, "Shouldn't happen")do { if (!(mContent->GetPrimaryFrame() == this)) { NS_DebugBreak
(NS_DEBUG_ASSERTION, "Shouldn't happen", "mContent->GetPrimaryFrame() == this"
, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 660); MOZ_PretendNoReturn(); } } while (0);
661
662 // XUL <iframe> or <browser>, or HTML <iframe>, <object> or <embed>
663 const auto wm = aReflowInput.GetWritingMode();
664 aDesiredSize.SetSize(wm, aReflowInput.ComputedSizeWithBorderPadding(wm));
665
666 // "offset" is the offset of our content area from our frame's
667 // top-left corner.
668 nsPoint offset = nsPoint(aReflowInput.ComputedPhysicalBorderPadding().left,
669 aReflowInput.ComputedPhysicalBorderPadding().top);
670
671 if (mInnerView) {
672 const nsMargin& bp = aReflowInput.ComputedPhysicalBorderPadding();
673 nsSize innerSize(aDesiredSize.Width() - bp.LeftRight(),
674 aDesiredSize.Height() - bp.TopBottom());
675
676 // Size & position the view according to 'object-fit' & 'object-position'.
677 nsRect destRect = GetDestRect(nsRect(offset, innerSize));
678 nsViewManager* vm = mInnerView->GetViewManager();
679 vm->MoveViewTo(mInnerView, destRect.x, destRect.y);
680 vm->ResizeView(mInnerView, nsRect(nsPoint(0, 0), destRect.Size()));
681 }
682
683 aDesiredSize.SetOverflowAreasToDesiredBounds();
684
685 FinishAndStoreOverflow(&aDesiredSize);
686
687 if (!aPresContext->IsRootPaginatedDocument() && !mPostedReflowCallback) {
688 PresShell()->PostReflowCallback(this);
689 mPostedReflowCallback = true;
690 }
691
692 NS_FRAME_TRACE(do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s"
, aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus
).c_str()); } } while (0)
693 NS_FRAME_TRACE_CALLS,do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s"
, aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus
).c_str()); } } while (0)
694 ("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s",do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s"
, aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus
).c_str()); } } while (0)
695 aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus).c_str()))do { if ((int(((mozilla::LogModule*)(nsIFrame::sFrameLogModule
))->Level()) & (0x1))) { TraceMsg ("exit nsSubDocumentFrame::Reflow: size=%d,%d status=%s"
, aDesiredSize.Width(), aDesiredSize.Height(), ToString(aStatus
).c_str()); } } while (0);
696}
697
698bool nsSubDocumentFrame::ReflowFinished() {
699 mPostedReflowCallback = false;
700 nsFrameLoader* fl = FrameLoader();
701 if (!fl) {
702 return false;
703 }
704 if (fl->IsRemoteFrame() && fl->HasRemoteBrowserBeenSized()) {
705 // For remote frames we don't need to update the size and position instantly
706 // (but we should try to do so if we haven't shown it yet).
707 return false;
708 }
709 RefPtr { fl } -> UpdatePositionAndSize(this);
710 return false;
711}
712
713void nsSubDocumentFrame::ReflowCallbackCanceled() {
714 mPostedReflowCallback = false;
715}
716
717nsresult nsSubDocumentFrame::AttributeChanged(int32_t aNameSpaceID,
718 nsAtom* aAttribute,
719 int32_t aModType) {
720 if (aNameSpaceID != kNameSpaceID_None) {
721 return NS_OK;
722 }
723
724 // If the noResize attribute changes, dis/allow frame to be resized
725 if (aAttribute == nsGkAtoms::noresize) {
726 // Note that we're not doing content type checks, but that's ok -- if
727 // they'd fail we will just end up with a null framesetFrame.
728 if (mContent->GetParent()->IsHTMLElement(nsGkAtoms::frameset)) {
729 nsIFrame* parentFrame = GetParent();
730
731 if (parentFrame) {
732 // There is no interface for nsHTMLFramesetFrame so QI'ing to
733 // concrete class, yay!
734 nsHTMLFramesetFrame* framesetFrame = do_QueryFrame(parentFrame);
735 if (framesetFrame) {
736 framesetFrame->RecalculateBorderResize();
737 }
738 }
739 }
740 } else if (aAttribute == nsGkAtoms::marginwidth ||
741 aAttribute == nsGkAtoms::marginheight) {
742 // Notify the frameloader
743 if (RefPtr<nsFrameLoader> frameloader = FrameLoader()) {
744 frameloader->MarginsChanged();
745 }
746 }
747
748 return NS_OK;
749}
750
751void nsSubDocumentFrame::MaybeUpdateEmbedderColorScheme() {
752 nsFrameLoader* fl = mFrameLoader.get();
753 if (!fl) {
754 return;
755 }
756
757 BrowsingContext* bc = fl->GetExtantBrowsingContext();
758 if (!bc) {
759 return;
760 }
761
762 auto ToOverride = [](ColorScheme aScheme) -> PrefersColorSchemeOverride {
763 return aScheme == ColorScheme::Dark ? PrefersColorSchemeOverride::Dark
764 : PrefersColorSchemeOverride::Light;
765 };
766
767 EmbedderColorSchemes schemes{
768 ToOverride(LookAndFeel::ColorSchemeForFrame(this, ColorSchemeMode::Used)),
769 ToOverride(
770 LookAndFeel::ColorSchemeForFrame(this, ColorSchemeMode::Preferred))};
771 if (bc->GetEmbedderColorSchemes() == schemes) {
772 return;
773 }
774
775 Unused << bc->SetEmbedderColorSchemes(schemes);
776}
777
778void nsSubDocumentFrame::MaybeUpdateRemoteStyle(
779 ComputedStyle* aOldComputedStyle) {
780 if (!mIsInObjectOrEmbed) {
781 return;
782 }
783
784 if (aOldComputedStyle &&
785 aOldComputedStyle->StyleVisibility()->mImageRendering ==
786 Style()->StyleVisibility()->mImageRendering) {
787 return;
788 }
789
790 if (!mFrameLoader) {
791 return;
792 }
793
794 if (mFrameLoader->IsRemoteFrame()) {
795 mFrameLoader->UpdateRemoteStyle(
796 Style()->StyleVisibility()->mImageRendering);
797 return;
798 }
799
800 BrowsingContext* context = mFrameLoader->GetExtantBrowsingContext();
801 if (!context) {
802 return;
803 }
804
805 Document* document = context->GetDocument();
806 if (!document) {
807 return;
808 }
809
810 if (document->IsImageDocument()) {
811 document->AsImageDocument()->UpdateRemoteStyle(
812 Style()->StyleVisibility()->mImageRendering);
813 }
814}
815
816void nsSubDocumentFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
817 nsAtomicContainerFrame::DidSetComputedStyle(aOldComputedStyle);
818
819 MaybeUpdateEmbedderColorScheme();
820
821 MaybeUpdateRemoteStyle(aOldComputedStyle);
822
823 // If this presshell has invisible ancestors, we don't need to propagate the
824 // visibility style change to the subdocument since the subdocument should
825 // have already set the IsUnderHiddenEmbedderElement flag in
826 // nsSubDocumentFrame::Init.
827 if (PresShell()->IsUnderHiddenEmbedderElement()) {
828 return;
829 }
830
831 const bool isVisible = StyleVisibility()->IsVisible();
832 if (!aOldComputedStyle ||
833 isVisible != aOldComputedStyle->StyleVisibility()->IsVisible()) {
834 PropagateIsUnderHiddenEmbedderElement(!isVisible);
835 }
836}
837
838nsIFrame* NS_NewSubDocumentFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
839 return new (aPresShell)
840 nsSubDocumentFrame(aStyle, aPresShell->GetPresContext());
841}
842
843NS_IMPL_FRAMEARENA_HELPERS(nsSubDocumentFrame)void* nsSubDocumentFrame ::operator new(size_t sz, mozilla::PresShell
* aShell) { return aShell->AllocateFrame(nsQueryFrame::nsSubDocumentFrame_id
, sz); }
844
845class nsHideViewer final : public Runnable {
846 public:
847 nsHideViewer(nsIContent* aFrameElement, nsFrameLoader* aFrameLoader,
848 PresShell* aPresShell, bool aHideViewerIfFrameless)
849 : mozilla::Runnable("nsHideViewer"),
850 mFrameElement(aFrameElement),
851 mFrameLoader(aFrameLoader),
852 mPresShell(aPresShell),
853 mHideViewerIfFrameless(aHideViewerIfFrameless) {
854 NS_ASSERTION(mFrameElement, "Must have a frame element")do { if (!(mFrameElement)) { NS_DebugBreak(NS_DEBUG_ASSERTION
, "Must have a frame element", "mFrameElement", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 854); MOZ_PretendNoReturn(); } } while (0);
855 NS_ASSERTION(mFrameLoader, "Must have a frame loader")do { if (!(mFrameLoader)) { NS_DebugBreak(NS_DEBUG_ASSERTION,
"Must have a frame loader", "mFrameLoader", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 855); MOZ_PretendNoReturn(); } } while (0);
856 NS_ASSERTION(mPresShell, "Must have a presshell")do { if (!(mPresShell)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Must have a presshell"
, "mPresShell", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 856); MOZ_PretendNoReturn(); } } while (0);
857 }
858
859 MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODvirtual nsresult Run() override {
860 // Flush frames, to ensure any pending display:none changes are made.
861 // Note it can be unsafe to flush if we've destroyed the presentation
862 // for some other reason, like if we're shutting down.
863 //
864 // But avoid the flush if we know for sure we're away, like when we're out
865 // of the document already.
866 //
867 // FIXME(emilio): This could still be a perf footgun when removing lots of
868 // siblings where each of them cause the reframe of an ancestor which happen
869 // to contain a subdocument.
870 //
871 // We should find some way to avoid that!
872 if (!mPresShell->IsDestroying() && mFrameElement->IsInComposedDoc()) {
873 mPresShell->FlushPendingNotifications(FlushType::Frames);
874 }
875
876 // Either the frame has been constructed by now, or it never will be,
877 // either way we want to clear the stashed views.
878 mFrameLoader->SetDetachedSubdocFrame(nullptr);
879
880 nsSubDocumentFrame* frame = do_QueryFrame(mFrameElement->GetPrimaryFrame());
881 if (!frame || frame->FrameLoader() != mFrameLoader) {
882 PropagateIsUnderHiddenEmbedderElement(mFrameLoader, true);
883 if (mHideViewerIfFrameless) {
884 // The frame element has no nsIFrame for the same frame loader.
885 // Hide the nsFrameLoader, which destroys the presentation.
886 mFrameLoader->Hide();
887 }
888 }
889 return NS_OK;
890 }
891
892 private:
893 const nsCOMPtr<nsIContent> mFrameElement;
894 const RefPtr<nsFrameLoader> mFrameLoader;
895 const RefPtr<PresShell> mPresShell;
896 const bool mHideViewerIfFrameless;
897};
898
899static nsView* BeginSwapDocShellsForViews(nsView* aSibling);
900
901void nsSubDocumentFrame::Destroy(DestroyContext& aContext) {
902 if (mPostedReflowCallback) {
903 PresShell()->CancelReflowCallback(this);
904 mPostedReflowCallback = false;
905 }
906
907 // Detach the subdocument's views and stash them in the frame loader.
908 // We can then reattach them if we're being reframed (for example if
909 // the frame has been made position:fixed).
910 if (RefPtr<nsFrameLoader> frameloader = FrameLoader()) {
911 ClearDisplayItems();
912
913 nsView* detachedViews =
914 ::BeginSwapDocShellsForViews(mInnerView->GetFirstChild());
915
916 frameloader->SetDetachedSubdocFrame(
917 detachedViews ? detachedViews->GetFrame() : nullptr);
918
919 // We call nsFrameLoader::HideViewer() in a script runner so that we can
920 // safely determine whether the frame is being reframed or destroyed.
921 nsContentUtils::AddScriptRunner(new nsHideViewer(
922 mContent, frameloader, PresShell(), (mDidCreateDoc || mCallingShow)));
923 }
924
925 nsAtomicContainerFrame::Destroy(aContext);
926}
927
928nsFrameLoader* nsSubDocumentFrame::FrameLoader() const {
929 if (mFrameLoader) {
930 return mFrameLoader;
931 }
932
933 if (RefPtr<nsFrameLoaderOwner> loaderOwner = do_QueryObject(GetContent())) {
934 mFrameLoader = loaderOwner->GetFrameLoader();
935 }
936
937 return mFrameLoader;
938}
939
940auto nsSubDocumentFrame::GetRemotePaintData() const -> RemoteFramePaintData {
941 if (mRetainedRemoteFrame) {
942 return *mRetainedRemoteFrame;
943 }
944
945 RemoteFramePaintData data;
946 nsFrameLoader* fl = FrameLoader();
947 if (!fl) {
948 return data;
949 }
950
951 auto* rb = fl->GetRemoteBrowser();
952 if (!rb) {
953 return data;
954 }
955 data.mLayersId = rb->GetLayersId();
956 data.mTabId = rb->GetTabId();
957 return data;
958}
959
960void nsSubDocumentFrame::ResetFrameLoader(RetainPaintData aRetain) {
961 if (aRetain == RetainPaintData::Yes && mFrameLoader) {
962 mRetainedRemoteFrame = Some(GetRemotePaintData());
963 } else {
964 mRetainedRemoteFrame.reset();
965 }
966 mFrameLoader = nullptr;
967 ClearDisplayItems();
968 nsContentUtils::AddScriptRunner(new AsyncFrameInit(this));
969}
970
971void nsSubDocumentFrame::ClearRetainedPaintData() {
972 mRetainedRemoteFrame.reset();
973 ClearDisplayItems();
974 InvalidateFrameSubtree();
975}
976
977// XXX this should be called ObtainDocShell or something like that,
978// to indicate that it could have side effects
979nsIDocShell* nsSubDocumentFrame::GetDocShell() const {
980 // How can FrameLoader() return null???
981 if (NS_WARN_IF(!FrameLoader())NS_warn_if_impl(!FrameLoader(), "!FrameLoader()", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 981)) {
982 return nullptr;
983 }
984 return mFrameLoader->GetDocShell(IgnoreErrors());
985}
986
987static void DestroyDisplayItemDataForFrames(nsIFrame* aFrame) {
988 // Destroying a WebRenderUserDataTable can cause destruction of other objects
989 // which can remove frame properties in their destructor. If we delete a frame
990 // property it runs the destructor of the stored object in the middle of
991 // updating the frame property table, so if the destruction of that object
992 // causes another update to the frame property table it would leave the frame
993 // property table in an inconsistent state. So we remove it from the table and
994 // then destroy it. (bug 1530657)
995 WebRenderUserDataTable* userDataTable =
996 aFrame->TakeProperty(WebRenderUserDataProperty::Key());
997 if (userDataTable) {
998 for (const auto& data : userDataTable->Values()) {
999 data->RemoveFromTable();
1000 }
1001 delete userDataTable;
1002 }
1003
1004 for (const auto& childList : aFrame->ChildLists()) {
1005 for (nsIFrame* child : childList.mList) {
1006 DestroyDisplayItemDataForFrames(child);
1007 }
1008 }
1009}
1010
1011static CallState BeginSwapDocShellsForDocument(Document& aDocument) {
1012 if (PresShell* presShell = aDocument.GetPresShell()) {
1013 // Disable painting while the views are detached, see bug 946929.
1014 presShell->SetNeverPainting(true);
1015
1016 if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
1017 ::DestroyDisplayItemDataForFrames(rootFrame);
1018 }
1019 }
1020 aDocument.EnumerateSubDocuments(BeginSwapDocShellsForDocument);
1021 return CallState::Continue;
1022}
1023
1024static nsView* BeginSwapDocShellsForViews(nsView* aSibling) {
1025 // Collect the removed sibling views in reverse order in 'removedViews'.
1026 nsView* removedViews = nullptr;
1027 while (aSibling) {
1028 if (Document* doc = ::GetDocumentFromView(aSibling)) {
1029 ::BeginSwapDocShellsForDocument(*doc);
1030 }
1031 nsView* next = aSibling->GetNextSibling();
1032 aSibling->GetViewManager()->RemoveChild(aSibling);
1033 aSibling->SetNextSibling(removedViews);
1034 removedViews = aSibling;
1035 aSibling = next;
1036 }
1037 return removedViews;
1038}
1039
1040/* static */
1041void nsSubDocumentFrame::InsertViewsInReverseOrder(nsView* aSibling,
1042 nsView* aParent) {
1043 MOZ_ASSERT(aParent, "null view")do { static_assert( mozilla::detail::AssertionConditionType<
decltype(aParent)>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(aParent))), 0))) { do { } while
(false); MOZ_ReportAssertionFailure("aParent" " (" "null view"
")", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1043); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aParent" ") ("
"null view" ")"); do { *((volatile int*)__null) = 1043; __attribute__
((nomerge)) ::abort(); } while (false); } } while (false);
1044 MOZ_ASSERT(!aParent->GetFirstChild(), "inserting into non-empty list")do { static_assert( mozilla::detail::AssertionConditionType<
decltype(!aParent->GetFirstChild())>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(!aParent->GetFirstChild()
))), 0))) { do { } while (false); MOZ_ReportAssertionFailure(
"!aParent->GetFirstChild()" " (" "inserting into non-empty list"
")", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1044); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!aParent->GetFirstChild()"
") (" "inserting into non-empty list" ")"); do { *((volatile
int*)__null) = 1044; __attribute__((nomerge)) ::abort(); } while
(false); } } while (false);
1045
1046 nsViewManager* vm = aParent->GetViewManager();
1047 while (aSibling) {
1048 nsView* next = aSibling->GetNextSibling();
1049 aSibling->SetNextSibling(nullptr);
1050 // true means 'after' in document order which is 'before' in view order,
1051 // so this call prepends the child, thus reversing the siblings as we go.
1052 vm->InsertChild(aParent, aSibling, nullptr, true);
1053 aSibling = next;
1054 }
1055}
1056
1057nsresult nsSubDocumentFrame::BeginSwapDocShells(nsIFrame* aOther) {
1058 if (!aOther || !aOther->IsSubDocumentFrame()) {
1059 return NS_ERROR_NOT_IMPLEMENTED;
1060 }
1061
1062 nsSubDocumentFrame* other = static_cast<nsSubDocumentFrame*>(aOther);
1063 if (!mFrameLoader || !mDidCreateDoc || mCallingShow || !other->mFrameLoader ||
1064 !other->mDidCreateDoc) {
1065 return NS_ERROR_NOT_IMPLEMENTED;
1066 }
1067
1068 ClearDisplayItems();
1069 other->ClearDisplayItems();
1070
1071 if (mInnerView && other->mInnerView) {
1072 nsView* ourSubdocViews = mInnerView->GetFirstChild();
1073 nsView* ourRemovedViews = ::BeginSwapDocShellsForViews(ourSubdocViews);
1074 nsView* otherSubdocViews = other->mInnerView->GetFirstChild();
1075 nsView* otherRemovedViews = ::BeginSwapDocShellsForViews(otherSubdocViews);
1076
1077 InsertViewsInReverseOrder(ourRemovedViews, other->mInnerView);
1078 InsertViewsInReverseOrder(otherRemovedViews, mInnerView);
1079 }
1080 mFrameLoader.swap(other->mFrameLoader);
1081 return NS_OK;
1082}
1083
1084static CallState EndSwapDocShellsForDocument(Document& aDocument) {
1085 // Our docshell and view trees have been updated for the new hierarchy.
1086 // Now also update all nsDeviceContext::mWidget to that of the
1087 // container view in the new hierarchy.
1088 if (nsCOMPtr<nsIDocShell> ds = aDocument.GetDocShell()) {
1089 nsCOMPtr<nsIDocumentViewer> viewer;
1090 ds->GetDocViewer(getter_AddRefs(viewer));
1091 while (viewer) {
1092 RefPtr<nsPresContext> pc = viewer->GetPresContext();
1093 if (pc && pc->GetPresShell()) {
1094 pc->GetPresShell()->SetNeverPainting(ds->IsInvisible());
1095 }
1096 nsDeviceContext* dc = pc ? pc->DeviceContext() : nullptr;
1097 if (dc) {
1098 nsView* v = viewer->FindContainerView();
1099 dc->Init(v ? v->GetNearestWidget(nullptr) : nullptr);
1100 }
1101 viewer = viewer->GetPreviousViewer();
1102 }
1103 }
1104
1105 aDocument.EnumerateSubDocuments(EndSwapDocShellsForDocument);
1106 return CallState::Continue;
1107}
1108
1109/* static */
1110void nsSubDocumentFrame::EndSwapDocShellsForViews(nsView* aSibling) {
1111 for (; aSibling; aSibling = aSibling->GetNextSibling()) {
1112 if (Document* doc = ::GetDocumentFromView(aSibling)) {
1113 ::EndSwapDocShellsForDocument(*doc);
1114 }
1115 nsIFrame* frame = aSibling->GetFrame();
1116 if (frame) {
1117 nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(frame);
1118 if (parent->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
1119 nsIFrame::AddInPopupStateBitToDescendants(frame);
1120 } else {
1121 nsIFrame::RemoveInPopupStateBitFromDescendants(frame);
1122 }
1123 if (frame->HasInvalidFrameInSubtree()) {
1124 while (parent &&
1125 !parent->HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT |
1126 NS_FRAME_IS_NONDISPLAY)) {
1127 parent->AddStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT);
1128 parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(parent);
1129 }
1130 }
1131 }
1132 }
1133}
1134
1135void nsSubDocumentFrame::EndSwapDocShells(nsIFrame* aOther) {
1136 nsSubDocumentFrame* other = static_cast<nsSubDocumentFrame*>(aOther);
1137 AutoWeakFrame weakThis(this);
1138 AutoWeakFrame weakOther(aOther);
1139
1140 if (mInnerView) {
1141 EndSwapDocShellsForViews(mInnerView->GetFirstChild());
1142 }
1143 if (other->mInnerView) {
1144 EndSwapDocShellsForViews(other->mInnerView->GetFirstChild());
1145 }
1146
1147 // Now make sure we reflow both frames, in case their contents
1148 // determine their size.
1149 // And repaint them, for good measure, in case there's nothing
1150 // interesting that happens during reflow.
1151 if (weakThis.IsAlive()) {
1152 PresShell()->FrameNeedsReflow(this, IntrinsicDirty::FrameAndAncestors,
1153 NS_FRAME_IS_DIRTY);
1154 InvalidateFrameSubtree();
1155 PropagateIsUnderHiddenEmbedderElement(
1156 PresShell()->IsUnderHiddenEmbedderElement() ||
1157 !StyleVisibility()->IsVisible());
1158 }
1159 if (weakOther.IsAlive()) {
1160 other->PresShell()->FrameNeedsReflow(
1161 other, IntrinsicDirty::FrameAndAncestors, NS_FRAME_IS_DIRTY);
1162 other->InvalidateFrameSubtree();
1163 other->PropagateIsUnderHiddenEmbedderElement(
1164 other->PresShell()->IsUnderHiddenEmbedderElement() ||
1165 !other->StyleVisibility()->IsVisible());
1166 }
1167}
1168
1169void nsSubDocumentFrame::ClearDisplayItems() {
1170 if (auto* builder = nsLayoutUtils::GetRetainedDisplayListBuilder(this)) {
1171 DL_LOGD("nsSubDocumentFrame::ClearDisplayItems() %p", this)do { const ::mozilla::LogModule* moz_real_module = GetLoggerByProcess
(); if ((__builtin_expect(!!(mozilla::detail::log_test(moz_real_module
, LogLevel::Debug)), 0))) { mozilla::detail::log_print(moz_real_module
, LogLevel::Debug, "nsSubDocumentFrame::ClearDisplayItems() %p"
, this); } } while (0);
1172 builder->ClearRetainedData();
1173 }
1174}
1175
1176nsView* nsSubDocumentFrame::EnsureInnerView() {
1177 if (mInnerView) {
1178 return mInnerView;
1179 }
1180
1181 // create, init, set the parent of the view
1182 nsView* outerView = GetView();
1183 NS_ASSERTION(outerView, "Must have an outer view already")do { if (!(outerView)) { NS_DebugBreak(NS_DEBUG_ASSERTION, "Must have an outer view already"
, "outerView", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1183); MOZ_PretendNoReturn(); } } while (0);
1184 nsRect viewBounds(0, 0, 0, 0); // size will be fixed during reflow
1185
1186 nsViewManager* viewMan = outerView->GetViewManager();
1187 nsView* innerView = viewMan->CreateView(viewBounds, outerView);
1188 if (!innerView) {
1189 NS_ERROR("Could not create inner view")do { NS_DebugBreak(NS_DEBUG_ASSERTION, "Could not create inner view"
, "Error", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1189); MOZ_PretendNoReturn(); } while (0);
1190 return nullptr;
1191 }
1192 mInnerView = innerView;
1193 viewMan->InsertChild(outerView, innerView, nullptr, true);
1194
1195 return mInnerView;
1196}
1197
1198nsPoint nsSubDocumentFrame::GetExtraOffset() const {
1199 MOZ_ASSERT(mInnerView)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(mInnerView)>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(mInnerView))), 0))) { do { }
while (false); MOZ_ReportAssertionFailure("mInnerView", "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1199); AnnotateMozCrashReason("MOZ_ASSERT" "(" "mInnerView"
")"); do { *((volatile int*)__null) = 1199; __attribute__((nomerge
)) ::abort(); } while (false); } } while (false);
1200 return mInnerView->GetPosition();
1201}
1202
1203void nsSubDocumentFrame::SubdocumentIntrinsicSizeOrRatioChanged() {
1204 const nsStylePosition* pos = StylePosition();
1205 bool dependsOnIntrinsics =
1206 !pos->mWidth.ConvertsToLength() || !pos->mHeight.ConvertsToLength();
1207
1208 if (dependsOnIntrinsics || pos->mObjectFit != StyleObjectFit::Fill) {
1209 auto dirtyHint = dependsOnIntrinsics
1210 ? IntrinsicDirty::FrameAncestorsAndDescendants
1211 : IntrinsicDirty::None;
1212 PresShell()->FrameNeedsReflow(this, dirtyHint, NS_FRAME_IS_DIRTY);
1213 InvalidateFrame();
1214 }
1215}
1216
1217bool nsSubDocumentFrame::ContentReactsToPointerEvents() const {
1218 if (Style()->PointerEvents() == StylePointerEvents::None) {
1219 return false;
1220 }
1221 if (mIsInObjectOrEmbed) {
1222 if (nsCOMPtr<nsIObjectLoadingContent> iolc = do_QueryInterface(mContent)) {
1223 const auto* olc = static_cast<nsObjectLoadingContent*>(iolc.get());
1224 if (olc->IsSyntheticImageDocument()) {
1225 return false;
1226 }
1227 }
1228 }
1229 return true;
1230}
1231
1232// Return true iff |aManager| is a "temporary layer manager". They're
1233// used for small software rendering tasks, like drawWindow. That's
1234// currently implemented by a BasicLayerManager without a backing
1235// widget, and hence in non-retained mode.
1236nsDisplayRemote::nsDisplayRemote(nsDisplayListBuilder* aBuilder,
1237 nsSubDocumentFrame* aFrame)
1238 : nsPaintedDisplayItem(aBuilder, aFrame),
1239 mEventRegionsOverride(EventRegionsOverride::NoOverride) {
1240 if (aBuilder->IsInsidePointerEventsNoneDoc() ||
1241 !aFrame->ContentReactsToPointerEvents()) {
1242 mEventRegionsOverride |= EventRegionsOverride::ForceEmptyHitRegion;
1243 }
1244 if (nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(
1245 aFrame->PresShell())) {
1246 mEventRegionsOverride |= EventRegionsOverride::ForceDispatchToContent;
1247 }
1248
1249 mPaintData = aFrame->GetRemotePaintData();
1250}
1251
1252namespace mozilla {
1253
1254void nsDisplayRemote::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
1255 DrawTarget* target = aCtx->GetDrawTarget();
1256 if (!target->IsRecording() || mPaintData.mTabId == 0) {
1257 NS_WARNING("Remote iframe not rendered")NS_DebugBreak(NS_DEBUG_WARNING, "Remote iframe not rendered",
nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/layout/generic/nsSubDocumentFrame.cpp"
, 1257);
1258 return;
1259 }
1260
1261 // Rendering the inner document will apply a scale to account for its app
1262 // units per dev pixel ratio. We want to apply the inverse scaling using our
1263 // app units per dev pixel ratio, so that no actual scaling will be applied if
1264 // they match. For in-process rendering, nsSubDocumentFrame creates an
1265 // nsDisplayZoom item if the app units per dev pixel ratio changes.
1266 //
1267 // Similarly, rendering the inner document will scale up by the cross process
1268 // paint scale again, so we also need to account for that.
1269 const int32_t appUnitsPerDevPixel =
1270 mFrame->PresContext()->AppUnitsPerDevPixel();
1271
1272 gfxContextMatrixAutoSaveRestore saveMatrix(aCtx);
1273 gfxFloat targetAuPerDev =
1274 gfxFloat(AppUnitsPerCSSPixel()) / aCtx->GetCrossProcessPaintScale();
1275
1276 gfxFloat scale = targetAuPerDev / appUnitsPerDevPixel;
1277 aCtx->Multiply(gfxMatrix::Scaling(scale, scale));
1278
1279 Rect destRect =
1280 NSRectToSnappedRect(GetContentRect(), targetAuPerDev, *target);
1281 target->DrawDependentSurface(mPaintData.mTabId, destRect);
1282}
1283
1284bool nsDisplayRemote::CreateWebRenderCommands(
1285 mozilla::wr::DisplayListBuilder& aBuilder,
1286 mozilla::wr::IpcResourceUpdateQueue& aResources,
1287 const StackingContextHelper& aSc,
1288 mozilla::layers::RenderRootStateManager* aManager,
1289 nsDisplayListBuilder* aDisplayListBuilder) {
1290 if (!mPaintData.mLayersId.IsValid()) {
1291 return true;
1292 }
1293
1294 auto* subDocFrame = static_cast<nsSubDocumentFrame*>(mFrame);
1295 nsRect destRect = subDocFrame->GetDestRect();
1296 if (aDisplayListBuilder->IsForPainting()) {
1297 subDocFrame->SetRasterScale(aSc.GetInheritedScale());
1298 const nsRect buildingRect = GetBuildingRect() - ToReferenceFrame();
1299 Maybe<nsRect> visibleRect =
1300 buildingRect.EdgeInclusiveIntersection(destRect);
1301 if (visibleRect) {
1302 *visibleRect -= destRect.TopLeft();
1303 }
1304 subDocFrame->SetVisibleRect(visibleRect);
1305 }
1306 nscoord auPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
1307 nsPoint layerOffset =
1308 aDisplayListBuilder->ToReferenceFrame(mFrame) + destRect.TopLeft();
1309 mOffset = LayoutDevicePoint::FromAppUnits(layerOffset, auPerDevPixel);
1310
1311 destRect.MoveTo(0, 0);
1312 auto rect = LayoutDeviceRect::FromAppUnits(destRect, auPerDevPixel);
1313 rect += mOffset;
1314
1315 aBuilder.PushIFrame(rect, !BackfaceIsHidden(),
1316 mozilla::wr::AsPipelineId(mPaintData.mLayersId),
1317 /*ignoreMissingPipelines*/ true);
1318
1319 return true;
1320}
1321
1322bool nsDisplayRemote::UpdateScrollData(
1323 mozilla::layers::WebRenderScrollData* aData,
1324 mozilla::layers::WebRenderLayerScrollData* aLayerData) {
1325 if (!mPaintData.mLayersId.IsValid()) {
1326 return true;
1327 }
1328
1329 if (aLayerData) {
1330 aLayerData->SetReferentId(mPaintData.mLayersId);
1331
1332 auto size = static_cast<nsSubDocumentFrame*>(mFrame)->GetSubdocumentSize();
1333 Matrix4x4 m = Matrix4x4::Translation(mOffset.x, mOffset.y, 0.0);
1334 aLayerData->SetTransform(m);
1335 aLayerData->SetEventRegionsOverride(mEventRegionsOverride);
1336 aLayerData->SetRemoteDocumentSize(LayerIntSize(size.width, size.height));
1337 }
1338 return true;
1339}
1340
1341nsFrameLoader* nsDisplayRemote::GetFrameLoader() const {
1342 return static_cast<nsSubDocumentFrame*>(mFrame)->FrameLoader();
1343}
1344
1345} // namespace mozilla