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f3ea248188
Replace them instead by a computed value flag, the same way as the IS_IN_DISPLAY_NONE_SUBTREE flag works.
81 lines
3.2 KiB
Rust
81 lines
3.2 KiB
Rust
/* 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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//! Misc information about a given computed style.
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bitflags! {
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/// Misc information about a given computed style.
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///
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/// All flags are currently inherited for text, pseudo elements, and
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/// anonymous boxes, see StyleBuilder::for_inheritance and its callsites.
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/// If we ever want to add some flags that shouldn't inherit for them,
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/// we might want to add a function to handle this.
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pub struct ComputedValueFlags: u16 {
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/// Whether the style or any of the ancestors has a text-decoration-line
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/// property that should get propagated to descendants.
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///
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/// text-decoration-line is a reset property, but gets propagated in the
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/// frame/box tree.
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const HAS_TEXT_DECORATION_LINES = 1 << 0;
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/// Whether line break inside should be suppressed.
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///
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/// If this flag is set, the line should not be broken inside,
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/// which means inlines act as if nowrap is set, <br> element is
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/// suppressed, and blocks are inlinized.
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///
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/// This bit is propagated to all children of line participants.
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/// It is currently used by ruby to make its content unbreakable.
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const SHOULD_SUPPRESS_LINEBREAK = 1 << 1;
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/// A flag used to mark text that that has text-combine-upright.
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///
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/// This is used from Gecko's layout engine.
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const IS_TEXT_COMBINED = 1 << 2;
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/// A flag used to mark styles under a relevant link that is also
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/// visited.
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const IS_RELEVANT_LINK_VISITED = 1 << 3;
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/// A flag used to mark styles which are a pseudo-element or under one.
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const IS_IN_PSEUDO_ELEMENT_SUBTREE = 1 << 4;
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/// A flag used to mark styles which are in a display: none subtree, or
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/// under one.
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const IS_IN_DISPLAY_NONE_SUBTREE = 1 << 5;
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/// Whether this style inherits the `display` property.
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///
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/// This is important because it may affect our optimizations to avoid
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/// computing the style of pseudo-elements, given whether the
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/// pseudo-element is generated depends on the `display` value.
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const INHERITS_DISPLAY = 1 << 6;
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/// Whether this style inherits the `content` property.
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///
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/// Important because of the same reason.
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const INHERITS_CONTENT = 1 << 7;
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/// Whether the child explicitly inherits any reset property.
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const INHERITS_RESET_STYLE = 1 << 8;
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/// A flag to mark a style which is a visited style.
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const IS_STYLE_IF_VISITED = 1 << 9;
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/// Whether the style or any of the ancestors has a multicol style.
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///
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/// Only used in Servo.
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const CAN_BE_FRAGMENTED = 1 << 10;
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}
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}
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impl ComputedValueFlags {
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/// Returns the flags that are inherited.
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#[inline]
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pub fn inherited(self) -> Self {
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self & !(ComputedValueFlags::INHERITS_DISPLAY |
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ComputedValueFlags::INHERITS_CONTENT |
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ComputedValueFlags::INHERITS_RESET_STYLE)
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}
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}
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