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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 */
/* rendering object for CSS "::backdrop" */
#include "nsBackdropFrame.h"
#include "mozilla/PresShell.h"
#include "nsDisplayList.h"
using namespace mozilla;
nsresult nsBackdropFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"Backdrop"_ns, aResult);
/* virtual */
ComputedStyle* nsBackdropFrame::GetParentComputedStyle(
nsIFrame** aProviderFrame) const {
// Style context of backdrop pseudo-element does not inherit from
// any element, per the Fullscreen API spec.
*aProviderFrame = nullptr;
return nullptr;
/* virtual */
void nsBackdropFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
// We want this frame to always be there even if its display value is
// none or contents so that we can respond to style change on it. To
// support those values, we skip painting ourselves in those cases.
auto display = StyleDisplay()->mDisplay;
if (display == mozilla::StyleDisplay::None ||
display == mozilla::StyleDisplay::Contents) {
DisplayBorderBackgroundOutline(aBuilder, aLists);
/* virtual */
LogicalSize nsBackdropFrame::ComputeAutoSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
ComputeSizeFlags aFlags) {
// Note that this frame is a child of the viewport frame.
LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
if (aFlags.contains(ComputeSizeFlag::ShrinkWrap)) {
result.ISize(aWM) = 0;
} else {
result.ISize(aWM) =
aAvailableISize - aMargin.ISize(aWM) - aBorderPadding.ISize(aWM);
return result;
/* virtual */
void nsBackdropFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
// Note that this frame is a child of the viewport frame.
WritingMode wm = aReflowInput.GetWritingMode();
aDesiredSize.SetSize(wm, aReflowInput.ComputedSizeWithBorderPadding(wm));