6cc7643f9c
The assertion is not serving much purpose. Now that container scrolling is a Live pref, checking it on the compositor side is racy if the pref is flipped, and on the content side it's clear from the code that it will only be set to true if the pref is turned on. Differential Revision: https://phabricator.services.mozilla.com/D7339
115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "FrameMetrics.h"
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#include "gfxPrefs.h"
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#include "nsStyleConsts.h"
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namespace mozilla {
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namespace layers {
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const FrameMetrics::ViewID FrameMetrics::NULL_SCROLL_ID = 0;
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void
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FrameMetrics::RecalculateViewportOffset()
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{
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if (!mIsRootContent) {
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return;
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}
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KeepLayoutViewportEnclosingVisualViewport(GetVisualViewport(), mViewport);
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}
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/* static */ void
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FrameMetrics::KeepLayoutViewportEnclosingVisualViewport(
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const CSSRect& aVisualViewport,
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CSSRect& aLayoutViewport)
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{
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// If the visual viewport is contained within the layout viewport, we don't
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// need to make any adjustments, so we can exit early.
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//
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// Additionally, if the composition bounds changes (due to an orientation
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// change, window resize, etc.), it may take a few frames for aLayoutViewport to
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// update and during that time, the visual viewport may be larger than the
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// layout viewport. In such situations, we take an early exit if the visual
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// viewport contains the layout viewport.
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if (aLayoutViewport.Contains(aVisualViewport) || aVisualViewport.Contains(aLayoutViewport)) {
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return;
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}
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// If visual viewport size is greater than the layout viewport, move the layout
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// viewport such that it remains inside the visual viewport. Otherwise,
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// move the layout viewport such that the visual viewport is contained
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// inside the layout viewport.
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if ((aLayoutViewport.Width() < aVisualViewport.Width() &&
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!FuzzyEqualsMultiplicative(aLayoutViewport.Width(), aVisualViewport.Width())) ||
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(aLayoutViewport.Height() < aVisualViewport.Height() &&
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!FuzzyEqualsMultiplicative(aLayoutViewport.Height(), aVisualViewport.Height()))) {
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if (aLayoutViewport.X() < aVisualViewport.X()) {
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// layout viewport moves right
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aLayoutViewport.MoveToX(aVisualViewport.X());
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} else if (aVisualViewport.XMost() < aLayoutViewport.XMost()) {
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// layout viewport moves left
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aLayoutViewport.MoveByX(aVisualViewport.XMost() - aLayoutViewport.XMost());
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}
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if (aLayoutViewport.Y() < aVisualViewport.Y()) {
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// layout viewport moves down
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aLayoutViewport.MoveToY(aVisualViewport.Y());
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} else if (aVisualViewport.YMost() < aLayoutViewport.YMost()) {
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// layout viewport moves up
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aLayoutViewport.MoveByY(aVisualViewport.YMost() - aLayoutViewport.YMost());
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}
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} else {
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if (aVisualViewport.X() < aLayoutViewport.X()) {
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aLayoutViewport.MoveToX(aVisualViewport.X());
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} else if (aLayoutViewport.XMost() < aVisualViewport.XMost()) {
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aLayoutViewport.MoveByX(aVisualViewport.XMost() - aLayoutViewport.XMost());
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}
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if (aVisualViewport.Y() < aLayoutViewport.Y()) {
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aLayoutViewport.MoveToY(aVisualViewport.Y());
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} else if (aLayoutViewport.YMost() < aVisualViewport.YMost()) {
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aLayoutViewport.MoveByY(aVisualViewport.YMost() - aLayoutViewport.YMost());
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}
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}
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}
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void
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ScrollMetadata::SetUsesContainerScrolling(bool aValue) {
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mUsesContainerScrolling = aValue;
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}
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static OverscrollBehavior
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ToOverscrollBehavior(StyleOverscrollBehavior aBehavior)
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{
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switch (aBehavior) {
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case StyleOverscrollBehavior::Auto:
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return OverscrollBehavior::Auto;
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case StyleOverscrollBehavior::Contain:
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return OverscrollBehavior::Contain;
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case StyleOverscrollBehavior::None:
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return OverscrollBehavior::None;
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}
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MOZ_ASSERT_UNREACHABLE("Invalid overscroll behavior");
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return OverscrollBehavior::Auto;
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}
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OverscrollBehaviorInfo
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OverscrollBehaviorInfo::FromStyleConstants(StyleOverscrollBehavior aBehaviorX,
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StyleOverscrollBehavior aBehaviorY)
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{
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OverscrollBehaviorInfo result;
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result.mBehaviorX = ToOverscrollBehavior(aBehaviorX);
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result.mBehaviorY = ToOverscrollBehavior(aBehaviorY);
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return result;
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}
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StaticAutoPtr<const ScrollMetadata> ScrollMetadata::sNullMetadata;
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}
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}
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