/* -*- 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,
typename Enable =
void>
struct HasTriggerImageLoads :
public std::false_type {};
template <
typename T>
struct HasTriggerImageLoads<T, decltype(std::declval<T&>().TriggerImageLoads(
std::declval<dom::Document&>(), nullptr))>
:
public std::true_type {};
template <
typename T,
const T* (ComputedStyle::*Method)()
const>
void TriggerImageLoads(dom::Document& aDocument,
const ComputedStyle* aOldStyle,
ComputedStyle* aStyle) {
if constexpr (HasTriggerImageLoads<T>::value) {
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;
}
const 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->SupportsContainLayoutAndPaint()) {
return true;
}
if (disp.IsFixedPosContainingBlockForTransformSupportingFrames() &&
aContextFrame->SupportsCSSTransforms()) {
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
