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diff --git a/layout/style/ComputedStyleInlines.h b/layout/style/ComputedStyleInlines.h
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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/. */
+
+/*
+ * Inlined methods for ComputedStyle. Will just redirect to
+ * GeckoComputedStyle methods when compiled without stylo, but will do
+ * virtual dispatch (by checking which kind of container it is)
+ * in stylo mode.
+ */
+
+#ifndef ComputedStyleInlines_h
+#define ComputedStyleInlines_h
+
+#include "mozilla/ComputedStyle.h"
+
+#include "MainThreadUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Unused.h"
+#include "nsStyleStructInlines.h"
+
+namespace mozilla {
+
+namespace detail {
+template <typename T, const T* (ComputedStyle::*Method)() const>
+void TriggerImageLoads(dom::Document& aDocument, const ComputedStyle* aOldStyle,
+ ComputedStyle* aStyle) {
+ if constexpr (T::kHasTriggerImageLoads) {
+ auto* old = aOldStyle ? (aOldStyle->*Method)() : nullptr;
+ auto* current = const_cast<T*>((aStyle->*Method)());
+ current->TriggerImageLoads(aDocument, old);
+ } else {
+ Unused << aOldStyle;
+ Unused << aStyle;
+ }
+}
+} // namespace detail
+
+void ComputedStyle::StartImageLoads(dom::Document& aDocument,
+ const ComputedStyle* aOldStyle) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+#define STYLE_STRUCT(name_) \
+ detail::TriggerImageLoads<nsStyle##name_, &ComputedStyle::Style##name_>( \
+ aDocument, aOldStyle, this);
+#include "nsStyleStructList.h"
+#undef STYLE_STRUCT
+}
+
+StylePointerEvents ComputedStyle::PointerEvents() const {
+ if (IsRootElementStyle()) {
+ // The root frame is not allowed to have pointer-events: none, or else no
+ // frames could be hit test against and scrolling the viewport would not
+ // work.
+ return StylePointerEvents::Auto;
+ }
+ auto& ui = *StyleUI();
+ if (ui.IsInert()) {
+ return StylePointerEvents::None;
+ }
+ return ui.ComputedPointerEvents();
+}
+
+StyleUserSelect ComputedStyle::UserSelect() const {
+ return StyleUI()->IsInert() ? StyleUserSelect::None
+ : StyleUIReset()->ComputedUserSelect();
+}
+
+bool ComputedStyle::IsFixedPosContainingBlockForNonSVGTextFrames() const {
+ // NOTE: Any CSS properties that influence the output of this function
+ // should return FIXPOS_CB_NON_SVG for will-change.
+ if (IsRootElementStyle()) {
+ return false;
+ }
+
+ const auto& disp = *StyleDisplay();
+ if (disp.mWillChange.bits & mozilla::StyleWillChangeBits::FIXPOS_CB_NON_SVG) {
+ return true;
+ }
+
+ const auto& effects = *StyleEffects();
+ return effects.HasFilters() || effects.HasBackdropFilters();
+}
+
+bool ComputedStyle::IsFixedPosContainingBlock(
+ const nsIFrame* aContextFrame) const {
+ // NOTE: Any CSS properties that influence the output of this function
+ // should also handle will-change appropriately.
+ if (aContextFrame->IsInSVGTextSubtree()) {
+ return false;
+ }
+ if (IsFixedPosContainingBlockForNonSVGTextFrames()) {
+ return true;
+ }
+ const auto& disp = *StyleDisplay();
+ if (disp.IsFixedPosContainingBlockForContainLayoutAndPaintSupportingFrames() &&
+ aContextFrame->IsFrameOfType(nsIFrame::eSupportsContainLayoutAndPaint)) {
+ return true;
+ }
+ if (disp.IsFixedPosContainingBlockForTransformSupportingFrames() &&
+ aContextFrame->IsFrameOfType(nsIFrame::eSupportsCSSTransforms)) {
+ return true;
+ }
+ return false;
+}
+
+bool ComputedStyle::IsAbsPosContainingBlock(
+ const nsIFrame* aContextFrame) const {
+ if (IsFixedPosContainingBlock(aContextFrame)) {
+ return true;
+ }
+ // NOTE: Any CSS properties that influence the output of this function
+ // should also handle will-change appropriately.
+ return StyleDisplay()->IsPositionedStyle() &&
+ !aContextFrame->IsInSVGTextSubtree();
+}
+
+} // namespace mozilla
+
+#endif // ComputedStyleInlines_h