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b1d8c6f915
- The VR specific render path in ContainerLayerComposite does not handle nsBackdropFrame correctly, resulting in a alternate frame strobing effect in the Oculus Headset. As VR content is composed of a Canvas element that is scaled to the extents of the surface, the backdrop would otherwise not have an effect for VR content, which means we can simply suppress the backdrop. MozReview-Commit-ID: 3bCTOApiH8E --HG-- extra : rebase_source : 015e15dee2ac3235e1e571642d3988b66b97dfd1
105 lines
3.6 KiB
C++
105 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* rendering object for CSS "::backdrop" */
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#include "nsBackdropFrame.h"
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using namespace mozilla;
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NS_IMPL_FRAMEARENA_HELPERS(nsBackdropFrame)
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/* virtual */ nsIAtom*
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nsBackdropFrame::GetType() const
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{
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return nsGkAtoms::backdropFrame;
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}
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsBackdropFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Backdrop"), aResult);
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}
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#endif
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/* virtual */ nsStyleContext*
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nsBackdropFrame::GetParentStyleContext(nsIFrame** aProviderFrame) const
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{
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// Style context of backdrop pseudo-element does not inherit from
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// any element, per the Fullscreen API spec.
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*aProviderFrame = nullptr;
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return nullptr;
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}
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/* virtual */ void
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nsBackdropFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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DO_GLOBAL_REFLOW_COUNT_DSP("nsBackdropFrame");
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// We want this frame to always be there even if its display value is
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// none or contents so that we can respond to style change on it. To
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// support those values, we skip painting ourselves in those cases.
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auto display = StyleDisplay()->mDisplay;
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if (display == NS_STYLE_DISPLAY_NONE ||
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display == NS_STYLE_DISPLAY_CONTENTS) {
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return;
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}
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// The WebVR specific render path in nsContainerLayerComposite
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// results in an alternating frame strobing effect when an nsBackdropFrame is
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// rendered.
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// Currently, VR content is composed of a fullscreen canvas element that
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// is expected to cover the entire viewport so a backdrop should not
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// be necessary.
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if (GetStateBits() & NS_FRAME_HAS_VR_CONTENT) {
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return;
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}
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DisplayBorderBackgroundOutline(aBuilder, aLists);
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}
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/* virtual */ LogicalSize
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nsBackdropFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
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WritingMode aWM,
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const LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const LogicalSize& aMargin,
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const LogicalSize& aBorder,
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const LogicalSize& aPadding,
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bool aShrinkWrap)
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{
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// Note that this frame is a child of the viewport frame.
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LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
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if (aShrinkWrap) {
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result.ISize(aWM) = 0;
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} else {
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result.ISize(aWM) = aAvailableISize - aMargin.ISize(aWM) -
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aBorder.ISize(aWM) - aPadding.ISize(aWM);
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}
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return result;
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}
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/* virtual */ void
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nsBackdropFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("nsBackdropFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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// Note that this frame is a child of the viewport frame.
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WritingMode wm = aReflowState.GetWritingMode();
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LogicalMargin borderPadding = aReflowState.ComputedLogicalBorderPadding();
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nscoord isize = aReflowState.ComputedISize() + borderPadding.IStartEnd(wm);
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nscoord bsize = aReflowState.ComputedBSize() + borderPadding.BStartEnd(wm);
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aDesiredSize.SetSize(wm, LogicalSize(wm, isize, bsize));
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aStatus = NS_FRAME_COMPLETE;
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}
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