зеркало из https://github.com/mozilla/gecko-dev.git
130 строки
4.2 KiB
C++
130 строки
4.2 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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#ifndef mozilla_ServoTypes_h
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#define mozilla_ServoTypes_h
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#include "mozilla/TypedEnumBits.h"
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/*
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* Type definitions used to interact with Servo. This gets included by nsINode,
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* so don't add significant include dependencies to this file.
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*/
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struct ServoNodeData;
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namespace mozilla {
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/*
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* Replaced types. These get mapped to associated Servo types in bindgen.
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*/
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template<typename T>
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struct ServoUnsafeCell {
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T value;
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// Ensure that primitive types (i.e. pointers) get zero-initialized.
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ServoUnsafeCell() : value() {};
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};
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template<typename T>
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struct ServoCell {
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ServoUnsafeCell<T> value;
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T Get() const { return value.value; }
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void Set(T arg) { value.value = arg; }
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ServoCell() : value() {};
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};
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// Indicates whether the Servo style system should expect the style on an element
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// to have already been resolved (i.e. via a parallel traversal), or whether it
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// may be lazily computed.
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enum class LazyComputeBehavior {
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Allow,
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Assert,
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};
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// Indicates whether the Servo style system should perform normal processing or
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// whether it should only process unstyled children of the root and their
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// descendants.
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enum class TraversalRootBehavior {
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Normal,
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UnstyledChildrenOnly,
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};
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// Indicates whether the Servo style system should perform normal processing,
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// animation-only processing (so we can flush any throttled animation styles),
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// or whether it should traverse in a mode that doesn't generate any change
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// hints, which is what's required when handling frame reconstruction.
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// The change hints in this case are unneeded, since the old frames have
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// already been destroyed.
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// Indicates how the Servo style system should perform.
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enum class TraversalRestyleBehavior {
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// Normal processing.
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Normal,
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// Normal processing, but tolerant to calls to restyle elements in unstyled
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// or display:none subtrees (which can occur when styling elements with
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// newly applied XBL bindings).
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ForNewlyBoundElement,
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// Traverses in a mode that doesn't generate any change hints, which is what's
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// required when handling frame reconstruction. The change hints in this case
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// are unneeded, since the old frames have already been destroyed.
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ForReconstruct,
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// Processes animation-only restyle.
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ForAnimationOnly,
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// Traverses as normal mode but tries to update all CSS animations.
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ForCSSRuleChanges,
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};
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// Indicates which rules should be included when performing selecting matching
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// on an element. DefaultOnly is used to exclude all rules except for those
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// that come from UA style sheets, and is used to implemented
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// getDefaultComputedStyle.
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enum class StyleRuleInclusion {
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All,
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DefaultOnly,
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};
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// Represents which tasks are performed in a SequentialTask of UpdateAnimations.
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enum class UpdateAnimationsTasks : uint8_t {
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CSSAnimations = 1 << 0,
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CSSTransitions = 1 << 1,
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EffectProperties = 1 << 2,
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CascadeResults = 1 << 3,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(UpdateAnimationsTasks)
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// The mode to use when parsing values.
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enum class ParsingMode : uint8_t {
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// In CSS, lengths must have units, except for zero values, where the unit can
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// be omitted.
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// https://www.w3.org/TR/css3-values/#lengths
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Default = 0,
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// In SVG, a coordinate or length value without a unit identifier (e.g., "25")
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// is assumed to be in user units (px).
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// https://www.w3.org/TR/SVG/coords.html#Units
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AllowUnitlessLength = 1 << 0,
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// In SVG, out-of-range values are not treated as an error in parsing.
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// https://www.w3.org/TR/SVG/implnote.html#RangeClamping
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AllowAllNumericValues = 1 << 1,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ParsingMode)
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// The kind of style we're generating when requesting Servo to give us an
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// inherited style.
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enum class InheritTarget {
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// We're requesting a text style.
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Text,
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// We're requesting a first-letter continuation frame style.
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FirstLetterContinuation,
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// We're requesting a style for a placeholder frame.
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PlaceholderFrame,
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};
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} // namespace mozilla
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#endif // mozilla_ServoTypes_h
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