Enum AfState

#[repr(i32)]
pub enum AfState {
    Idle = 0,
    Scanning = 1,
    Focused = 2,
    Failed = 3,
}

The current state of the AF algorithm.

This control reports the current state of the AF algorithm in conjunction with the reported AfMode value and (in continuous AF mode) the AfPauseState value. The possible state changes are described below, though we note the following state transitions that occur when the AfMode is changed.

If the AfMode is set to AfModeManual, then the AfState will always report AfStateIdle (even if the lens is subsequently moved). Changing to the AfModeManual state does not initiate any lens movement.

If the AfMode is set to AfModeAuto then the AfState will report AfStateIdle. However, if AfModeAuto and AfTriggerStart are sent together then AfState will omit AfStateIdle and move straight to AfStateScanning (and start a scan).

If the AfMode is set to AfModeContinuous then the AfState will initially report AfStateScanning.

Variants

Idle = 0

The AF algorithm is in manual mode (AfModeManual) or in auto mode (AfModeAuto) and a scan has not yet been triggered, or an in-progress scan was cancelled.

Scanning = 1

The AF algorithm is in auto mode (AfModeAuto), and a scan has been started using the AfTrigger control.

The scan can be cancelled by sending AfTriggerCancel at which point the algorithm will either move back to AfStateIdle or, if the scan actually completes before the cancel request is processed, to one of AfStateFocused or AfStateFailed.

Alternatively the AF algorithm could be in continuous mode (AfModeContinuous) at which point it may enter this state spontaneously whenever it determines that a rescan is needed.

Focused = 2

The AF algorithm is in auto (AfModeAuto) or continuous (AfModeContinuous) mode and a scan has completed with the result that the algorithm believes the image is now in focus.

Failed = 3

The AF algorithm is in auto (AfModeAuto) or continuous (AfModeContinuous) mode and a scan has completed with the result that the algorithm did not find a good focus position.

Trait Implementations

impl Clone for AfState

fn clone(&self) -> AfState

Returns a copy of the value.

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

Performs copy-assignment from source.

impl ControlEntry for AfState

const ID: u32 = 41u32

impl Debug for AfState

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

Formats the value using the given formatter.

impl From<AfState> for ControlValue

fn from(val: AfState) -> Self

Converts to this type from the input type.

impl From<AfState> for i32

fn from(enum_value: AfState) -> Self

Converts to this type from the input type.

impl PartialEq for AfState

fn eq(&self, other: &AfState) -> 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 TryFrom<ControlValue> for AfState

type Error = ControlValueError

The type returned in the event of a conversion error.

fn try_from(value: ControlValue) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<i32> for AfState

type Error = TryFromPrimitiveError<AfState>

The type returned in the event of a conversion error.

fn try_from(number: i32) -> Result<Self, TryFromPrimitiveError<Self>>

Performs the conversion.

impl TryFromPrimitive for AfState

const NAME: &'static str = "AfState"

type Primitive = i32

fn try_from_primitive( number: Self::Primitive, ) -> Result<Self, TryFromPrimitiveError<Self>>

impl Control for AfState

impl Copy for AfState

impl Eq for AfState

impl StructuralPartialEq for AfState