/* 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 https://mozilla.org/MPL/2.0/. */ use bitflags::bitflags; use malloc_size_of::malloc_size_of_is_0; use malloc_size_of_derive::MallocSizeOf; use script_layout_interface::combine_id_with_fragment_type; use style::dom::OpaqueNode; use style::selector_parser::PseudoElement; /// This data structure stores fields that are common to all non-base /// Fragment types and should generally be the first member of all /// concrete fragments. #[derive(Clone, Debug, MallocSizeOf)] pub(crate) struct BaseFragment { /// A tag which identifies the DOM node and pseudo element of this /// Fragment's content. If this fragment is for an anonymous box, /// the tag will be None. pub tag: Option, /// Flags which various information about this fragment used during /// layout. pub flags: FragmentFlags, } impl BaseFragment { pub(crate) fn anonymous() -> Self { BaseFragment { tag: None, flags: FragmentFlags::empty(), } } /// Returns true if this fragment is non-anonymous and it is for the given /// OpaqueNode, regardless of the pseudo element. pub(crate) fn is_for_node(&self, node: OpaqueNode) -> bool { self.tag.map(|tag| tag.node == node).unwrap_or(false) } } /// Information necessary to construct a new BaseFragment. #[derive(Clone, Copy, Debug, MallocSizeOf)] pub(crate) struct BaseFragmentInfo { /// The tag to use for the new BaseFragment, if it is not an anonymous Fragment. pub tag: Option, /// The flags to use for the new BaseFragment. pub flags: FragmentFlags, } impl BaseFragmentInfo { pub(crate) fn new_for_node(node: OpaqueNode) -> Self { Self { tag: Some(Tag::new(node)), flags: FragmentFlags::empty(), } } pub(crate) fn anonymous() -> Self { Self { tag: None, flags: FragmentFlags::empty(), } } } impl From for BaseFragment { fn from(info: BaseFragmentInfo) -> Self { Self { tag: info.tag, flags: info.flags, } } } bitflags! { /// Flags used to track various information about a DOM node during layout. #[derive(Clone, Copy, Debug)] pub(crate) struct FragmentFlags: u16 { /// Whether or not the node that created this fragment is a `` element on an HTML document. const IS_BODY_ELEMENT_OF_HTML_ELEMENT_ROOT = 1 << 0; /// Whether or not the node that created this Fragment is a `
` element. const IS_BR_ELEMENT = 1 << 1; /// Whether or not the node that created this Fragment is a `` or `

` element.
        const IS_TEXT_CONTROL = 1 << 2;
        /// Whether or not this Fragment is a flex item or a grid item.
        const IS_FLEX_OR_GRID_ITEM = 1 << 3;
        /// Whether or not this Fragment was created to contain a replaced element or is
        /// a replaced element.
        const IS_REPLACED = 1 << 4;
        /// Whether or not the node that created was a `<table>`, `<th>` or
        /// `<td>` element. Note that this does *not* include elements with
        /// `display: table` or `display: table-cell`.
        const IS_TABLE_TH_OR_TD_ELEMENT = 1 << 5;
        /// Whether or not this Fragment was created to contain a list item marker
        /// with a used value of `list-style-position: outside`.
        const IS_OUTSIDE_LIST_ITEM_MARKER = 1 << 6;
        /// Avoid painting the borders, backgrounds, and drop shadow for this fragment, this is used
        /// for empty table cells when 'empty-cells' is 'hide' and also table wrappers.  This flag
        /// doesn't avoid hit-testing nor does it prevent the painting outlines.
        const DO_NOT_PAINT = 1 << 7;
        /// Whether or not the size of this fragment depends on the block size of its container
        /// and the fragment can be a flex item. This flag is used to cache items during flex
        /// layout.
        const SIZE_DEPENDS_ON_BLOCK_CONSTRAINTS_AND_CAN_BE_CHILD_OF_FLEX_ITEM = 1 << 8;
        /// Whether or not the node that created this fragment is the root element.
        const IS_ROOT_ELEMENT = 1 << 9;
    }
}

malloc_size_of_is_0!(FragmentFlags);

/// A data structure used to hold DOM and pseudo-element information about
/// a particular layout object.
#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, PartialEq)]
pub(crate) struct Tag {
    pub(crate) node: OpaqueNode,
    pub(crate) pseudo: Option<PseudoElement>,
}

impl Tag {
    /// Create a new Tag for a non-pseudo element. This is mainly used for
    /// matching existing tags, since it does not accept an `info` argument.
    pub(crate) fn new(node: OpaqueNode) -> Self {
        Tag { node, pseudo: None }
    }

/// Create a new Tag for a pseudo element. This is mainly used for
    /// matching existing tags, since it does not accept an `info` argument.
    pub(crate) fn new_pseudo(node: OpaqueNode, pseudo: Option<PseudoElement>) -> Self {
        Tag { node, pseudo }
    }

pub(crate) fn to_display_list_fragment_id(self) -> u64 {
        combine_id_with_fragment_type(self.node.id(), self.pseudo.into())
    }
}