/* * Copyright (C) 2018 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if ENABLE(LAYOUT_FORMATTING_CONTEXT) #include <wtf/HashMap.h> #include <wtf/HashSet.h> #include <wtf/IsoMalloc.h> #include <wtf/OptionSet.h> namespace WebCore { #if ENABLE(LAYOUT_FORMATTING_CONTEXT) class RenderView; #endif namespace Display { class Box; } namespace Layout { enum class StyleDiff; class Box; class Container; class FormattingState; // LayoutState is the entry point for layout. It takes the initial containing block which acts as the root of the layout context. // LayoutState::layout() generates the display tree for the root container's subtree (it does not run layout on the root though). // Note, while the initial containing block is entry point for the initial layout, it does not necessarily need to be the entry point of any // subsequent layouts (subtree layout). A non-initial, subtree layout could be initiated on multiple formatting contexts. // Each formatting context has an entry point for layout, which potenitally means multiple entry points per layout frame. // LayoutState also holds the formatting states. They cache formatting context specific data to enable performant incremental layouts. class LayoutState { WTF_MAKE_ISO_ALLOCATED(LayoutState); public: LayoutState(const Container& initialContainingBlock, const LayoutSize&); void updateLayout(); void styleChanged(const Box&, StyleDiff); void setInQuirksMode(bool inQuirksMode) { m_inQuirksMode = inQuirksMode; } enum class UpdateType { Overflow = 1 << 0, Position = 1 << 1, Size = 1 << 2, All = Overflow | Position | Size }; void markNeedsUpdate(const Box&, OptionSet<UpdateType>); bool needsUpdate(const Box&) const; FormattingState& formattingStateForBox(const Box&) const; FormattingState& establishedFormattingState(const Box& formattingRoot) const; FormattingState& createFormattingStateForFormattingRootIfNeeded(const Box& formattingRoot); Display::Box& displayBoxForLayoutBox(const Box& layoutBox) const; bool hasDisplayBox(const Box& layoutBox) const { return m_layoutToDisplayBox.contains(&layoutBox); } bool inQuirksMode() const { return m_inQuirksMode; } // For testing purposes only void verifyAndOutputMismatchingLayoutTree(const RenderView&) const; private: const Container& initialContainingBlock() const { return *m_initialContainingBlock; } void layoutFormattingContextSubtree(const Box&); WeakPtr<const Container> m_initialContainingBlock; HashSet<const Container*> m_formattingContextRootListForLayout; HashMap<const Box*, std::unique_ptr<FormattingState>> m_formattingStates; mutable HashMap<const Box*, std::unique_ptr<Display::Box>> m_layoutToDisplayBox; bool m_inQuirksMode { false }; }; } } #endif