Struct ContextFeatureFlags

pub struct ContextFeatureFlags(/* private fields */);

Feature flags that allow augmenting Context behavior. Some features require additional services in the service directory provided during context initialization. See [CreateContextParams.service_directory].

Implementations

impl ContextFeatureFlags

pub const NETWORK: ContextFeatureFlags

Enables network access. Requires the following services:

• [fuchsia.net.interfaces/State]
• [fuchsia.net.name/Lookup]
• [fuchsia.posix.socket/Provider]

pub const AUDIO: ContextFeatureFlags

Enables audio input and output. Requires the following services:

• [fuchsia.media/Audio]
• [fuchsia.media/AudioDeviceEnumerator]
• [fuchsia.media/SessionAudioConsumerFactory]

pub const VULKAN: ContextFeatureFlags

Enables GPU-accelerated rendering of the web content. Requires the following services:

• [fuchsia.vulkan.loader/Loader] The following service is required in order to collect Vulkan trace data.
• [fuchsia.tracing.provider.Registry]

pub const HARDWARE_VIDEO_DECODER: ContextFeatureFlags

Enables hardware video decoding. [ContextFeatureFlags.VULKAN] must be enabled as well. Requires the following service:

• [fuchsia.mediacodec/CodecFactory]

pub const HARDWARE_VIDEO_DECODER_ONLY: ContextFeatureFlags

Disables video codecs that cannot be decoded in hardware. Software decoders will only be used as fallbacks for hardware decoders, such as when insufficient resources are available. Requires [ContextFeatureFlags.HARDWARE_VIDEO_DECODER].

pub const WIDEVINE_CDM: ContextFeatureFlags

Enables Widevine CDM modules for EME API. [ContextFeatureFlags.VULKAN] must be enabled as well. Requires [fuchsia.media.drm/Widevine] service. Requires that a cdm_data_directory be specified in [CreateContextParams].

pub const HEADLESS: ContextFeatureFlags

Allows embedders to render web content without graphical output or Scenic. Not compatible with [ContextFeatureFlags.VULKAN].

pub const LEGACYMETRICS: ContextFeatureFlags

Report telemetry data to the [fuchsia.legacymetrics/MetricsRecorder].

pub const KEYBOARD: ContextFeatureFlags

Enables input events for keyboard keypresses. Requires [fuchsia.ui.input3/Keyboard], from which the events are obtained.

pub const VIRTUAL_KEYBOARD: ContextFeatureFlags

Enables the use of onscreen virtual keyboards. The implementation will manage the state of the keyboard in response to input/focus events in web content. Requires the [fuchsia.input.virtualkeyboard/ControllerCreator] service and [ContextFeatureFlags.KEYBOARD].

pub const DISABLE_DYNAMIC_CODE_GENERATION: ContextFeatureFlags

Disables dynamic generation of machine-code from scripts (e.g. JavaScript) and other technologies (e.g. WebAssembly). This should typically result in scripts being executed by an interpreter, with associated loss in performance. Other technologies relying on dynamic code generation may be provided in a limited form where feasible, or unavailable if interpreting would render them unusable (as is likely the case for WebAssembly). [fuchsia.kernel/VmexResource] is not required if this option is set.

impl ContextFeatureFlags

pub const fn empty() -> ContextFeatureFlags

Get a flags value with all bits unset.

pub const fn all() -> ContextFeatureFlags

Get a flags value with all known bits set.

pub const fn bits(&self) -> u64

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u64) -> Option<ContextFeatureFlags>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u64) -> ContextFeatureFlags

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u64) -> ContextFeatureFlags

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<ContextFeatureFlags>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: ContextFeatureFlags) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: ContextFeatureFlags) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: ContextFeatureFlags)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: ContextFeatureFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: ContextFeatureFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: ContextFeatureFlags, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection( self, other: ContextFeatureFlags, ) -> ContextFeatureFlags

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference( self, other: ContextFeatureFlags, ) -> ContextFeatureFlags

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> ContextFeatureFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl ContextFeatureFlags

pub const fn iter(&self) -> Iter<ContextFeatureFlags>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<ContextFeatureFlags>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

impl ContextFeatureFlags

pub fn has_unknown_bits(&self) -> bool

👎Deprecated: Strict bits should not use has_unknown_bits

pub fn get_unknown_bits(&self) -> u64

👎Deprecated: Strict bits should not use get_unknown_bits

Trait Implementations

impl Binary for ContextFeatureFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl BitAnd for ContextFeatureFlags

fn bitand(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The bitwise and (&) of the bits in two flags values.

type Output = ContextFeatureFlags

The resulting type after applying the & operator.

impl BitAndAssign for ContextFeatureFlags

fn bitand_assign(&mut self, other: ContextFeatureFlags)

The bitwise and (&) of the bits in two flags values.

impl BitOr for ContextFeatureFlags

fn bitor(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The bitwise or (|) of the bits in two flags values.

type Output = ContextFeatureFlags

The resulting type after applying the | operator.

impl BitOrAssign for ContextFeatureFlags

fn bitor_assign(&mut self, other: ContextFeatureFlags)

The bitwise or (|) of the bits in two flags values.

impl BitXor for ContextFeatureFlags

fn bitxor(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = ContextFeatureFlags

The resulting type after applying the ^ operator.

impl BitXorAssign for ContextFeatureFlags

fn bitxor_assign(&mut self, other: ContextFeatureFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for ContextFeatureFlags

fn clone(&self) -> ContextFeatureFlags

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ContextFeatureFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<D> Decode<ContextFeatureFlags, D> for ContextFeatureFlags

where D: ResourceDialect,

fn new_empty() -> ContextFeatureFlags

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<(), Error>

Decodes an object of type T from the decoder’s buffers into self.

impl Default for ContextFeatureFlags

fn default() -> ContextFeatureFlags

Returns the “default value” for a type.

impl<D> Encode<ContextFeatureFlags, D> for ContextFeatureFlags

where D: ResourceDialect,

unsafe fn encode( self, encoder: &mut Encoder<'_, D>, offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl Extend<ContextFeatureFlags> for ContextFeatureFlags

fn extend<T>(&mut self, iterator: T)

where T: IntoIterator<Item = ContextFeatureFlags>,

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for ContextFeatureFlags

const FLAGS: &'static [Flag<ContextFeatureFlags>]

The set of defined flags.

type Bits = u64

The underlying bits type.

fn bits(&self) -> u64

Get the underlying bits value.

fn from_bits_retain(bits: u64) -> ContextFeatureFlags

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn contains_unknown_bits(&self) -> bool

This method will return true if any unknown bits are set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn truncate(&mut self)

where Self: Sized,

Remove any unknown bits from the flags.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call [Flags::insert] when value is true or [Flags::remove] when value is false.

fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromIterator<ContextFeatureFlags> for ContextFeatureFlags

fn from_iter<T>(iterator: T) -> ContextFeatureFlags

where T: IntoIterator<Item = ContextFeatureFlags>,

The bitwise or (|) of the bits in each flags value.

impl Hash for ContextFeatureFlags

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoIterator for ContextFeatureFlags

type Item = ContextFeatureFlags

The type of the elements being iterated over.

type IntoIter = Iter<ContextFeatureFlags>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <ContextFeatureFlags as IntoIterator>::IntoIter

Creates an iterator from a value.

impl LowerHex for ContextFeatureFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Not for ContextFeatureFlags

fn not(self) -> ContextFeatureFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = ContextFeatureFlags

The resulting type after applying the ! operator.

impl Octal for ContextFeatureFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Ord for ContextFeatureFlags

fn cmp(&self, other: &ContextFeatureFlags) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ContextFeatureFlags

fn eq(&self, other: &ContextFeatureFlags) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ContextFeatureFlags

fn partial_cmp(&self, other: &ContextFeatureFlags) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Sub for ContextFeatureFlags

fn sub(self, other: ContextFeatureFlags) -> ContextFeatureFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = ContextFeatureFlags

The resulting type after applying the - operator.

impl SubAssign for ContextFeatureFlags

fn sub_assign(&mut self, other: ContextFeatureFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl TypeMarker for ContextFeatureFlags

type Owned = ContextFeatureFlags

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl UpperHex for ContextFeatureFlags

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl ValueTypeMarker for ContextFeatureFlags

type Borrowed<'a> = ContextFeatureFlags

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &Self::Owned. There are three cases:

fn borrow( value: &<ContextFeatureFlags as TypeMarker>::Owned, ) -> <ContextFeatureFlags as ValueTypeMarker>::Borrowed<'_>

Cheaply converts from &Self::Owned to Self::Borrowed.

impl Copy for ContextFeatureFlags

impl Eq for ContextFeatureFlags

impl StructuralPartialEq for ContextFeatureFlags