Enum ValueDirection 

#[repr(i32)]
pub enum ValueDirection {
    Unspecified = 0,
    BackwardsLooking = 1,
    ForwardsLooking = 2,
}

Direction of the time interval that each emitted sample applies to. A GPU counter is sampled at discrete timestamps, but its value really represents a measurement over some interval around that timestamp (e.g. average GPU utilization over the sampling window). This field tells trace processor on which side of the timestamp that interval lies, which controls where the value is drawn in the UI.

Example: samples at t=10, 20, 30 with values 5, 7, 0. BACKWARDS_LOOKING: 5 covers (-inf, 10], 7 covers (10, 20], 0 covers (20, 30]; the UI draws 7 between t=10 and t=20. FORWARDS_LOOKING: 5 covers [10, 20), 7 covers [20, 30), 0 covers [30, +inf); the UI draws 5 between t=10 and t=20.

Variants

Unspecified = 0

Treated as BACKWARDS_LOOKING (the historical default).

BackwardsLooking = 1

The value applies to the interval ending at this event’s timestamp. This is the convention used by AGI and most existing GPU producers, where a sample reports what happened during the window leading up to the timestamp.

ForwardsLooking = 2

The value applies to the interval starting at this event’s timestamp, matching standard Perfetto counters. Producers that emit explicit zero samples to denote “no activity from here on” should use this so the zero is not back-propagated over earlier non-zero samples (https://github.com/google/perfetto/issues/5683).

Implementations

impl ValueDirection

pub fn is_valid(value: i32) -> bool

Returns true if value is a variant of ValueDirection.

pub fn from_i32(value: i32) -> Option<ValueDirection>

Converts an i32 to a ValueDirection, or None if value is not a valid variant.

impl ValueDirection

pub fn as_str_name(&self) -> &'static str

String value of the enum field names used in the ProtoBuf definition.

The values are not transformed in any way and thus are considered stable (if the ProtoBuf definition does not change) and safe for programmatic use.

Trait Implementations

impl Clone for ValueDirection

fn clone(&self) -> ValueDirection

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValueDirection

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

Formats the value using the given formatter.

impl Default for ValueDirection

fn default() -> ValueDirection

Returns the “default value” for a type.

impl From<ValueDirection> for i32

fn from(value: ValueDirection) -> i32

Converts to this type from the input type.

impl Hash for ValueDirection

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

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 Ord for ValueDirection

fn cmp(&self, other: &ValueDirection) -> 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 ValueDirection

fn eq(&self, other: &ValueDirection) -> 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 ValueDirection

fn partial_cmp(&self, other: &ValueDirection) -> 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 Copy for ValueDirection

impl Eq for ValueDirection

impl StructuralPartialEq for ValueDirection