gecko-dev/layout/style/ServoTypes.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ServoTypes_h
#define mozilla_ServoTypes_h
#include "mozilla/TypedEnumBits.h"
/*
* Type definitions used to interact with Servo. This gets included by nsINode,
* so don't add significant include dependencies to this file.
*/
struct ServoNodeData;
namespace mozilla {
/*
* Replaced types. These get mapped to associated Servo types in bindgen.
*/
template<typename T>
struct ServoUnsafeCell {
T value;
// Ensure that primitive types (i.e. pointers) get zero-initialized.
ServoUnsafeCell() : value() {};
};
template<typename T>
struct ServoCell {
ServoUnsafeCell<T> value;
T Get() const { return value.value; }
void Set(T arg) { value.value = arg; }
ServoCell() : value() {};
};
// Indicates whether the Servo style system should expect the style on an element
// to have already been resolved (i.e. via a parallel traversal), or whether it
// may be lazily computed.
enum class LazyComputeBehavior {
Allow,
Assert,
};
// Indicates whether the Servo style system should perform normal processing or
// whether it should only process unstyled children of the root and their
// descendants.
enum class TraversalRootBehavior {
Normal,
UnstyledChildrenOnly,
};
// Indicates whether the Servo style system should perform normal processing,
// animation-only processing (so we can flush any throttled animation styles),
// or whether it should traverse in a mode that doesn't generate any change
// hints, which is what's required when handling frame reconstruction.
// The change hints in this case are unneeded, since the old frames have
// already been destroyed.
// Indicates how the Servo style system should perform.
enum class TraversalRestyleBehavior {
// Normal processing.
Normal,
// Traverses in a mode that doesn't generate any change hints, which is what's
// required when handling frame reconstruction. The change hints in this case
// are unneeded, since the old frames have already been destroyed.
ForReconstruct,
// Processes animation-only restyle.
ForAnimationOnly,
// Traverses as normal mode but tries to update all CSS animations.
ForCSSRuleChanges,
};
// Indicates which rules should be included when performing selecting matching
// on an element. DefaultOnly is used to exclude all rules except for those
// that come from UA style sheets, and is used to implemented
// getDefaultComputedStyle.
enum class StyleRuleInclusion {
All,
DefaultOnly,
};
// Represents which tasks are performed in a SequentialTask of UpdateAnimations.
enum class UpdateAnimationsTasks : uint8_t {
CSSAnimations = 1 << 0,
CSSTransitions = 1 << 1,
EffectProperties = 1 << 2,
CascadeResults = 1 << 3,
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(UpdateAnimationsTasks)
// The mode to use when parsing values.
enum class ParsingMode : uint8_t {
// In CSS, lengths must have units, except for zero values, where the unit can
// be omitted.
// https://www.w3.org/TR/css3-values/#lengths
Default = 0,
// In SVG, a coordinate or length value without a unit identifier (e.g., "25")
// is assumed to be in user units (px).
// https://www.w3.org/TR/SVG/coords.html#Units
AllowUnitlessLength = 1 << 0,
// In SVG, out-of-range values are not treated as an error in parsing.
// https://www.w3.org/TR/SVG/implnote.html#RangeClamping
AllowAllNumericValues = 1 << 1,
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ParsingMode)
// The kind of style we're generating when requesting Servo to give us an
// inherited style.
enum class InheritTarget {
// We're requesting a text style.
Text,
// We're requesting a first-letter continuation frame style.
FirstLetterContinuation,
// We're requesting a style for a placeholder frame.
PlaceholderFrame,
};
} // namespace mozilla
#endif // mozilla_ServoTypes_h