Enum captcha_a::ImageError

source · [−]

pub enum ImageError {
    Decoding(DecodingError),
    Encoding(EncodingError),
    Parameter(ParameterError),
    Limits(LimitError),
    Unsupported(UnsupportedError),
    IoError(Error),
}

Expand description

The generic error type for image operations.

This high level enum allows, by variant matching, a rough separation of concerns between underlying IO, the caller, format specifications, and the image implementation.

Variants

`Decoding(DecodingError)`

An error was encountered while decoding.

This means that the input data did not conform to the specification of some image format, or that no format could be determined, or that it did not match format specific requirements set by the caller.

`Encoding(EncodingError)`

An error was encountered while encoding.

The input image can not be encoded with the chosen format, for example because the specification has no representation for its color space or because a necessary conversion is ambiguous. In some cases it might also happen that the dimensions can not be used with the format.

`Parameter(ParameterError)`

An error was encountered in input arguments.

This is a catch-all case for strictly internal operations such as scaling, conversions, etc. that involve no external format specifications.

`Limits(LimitError)`

Completing the operation would have required more resources than allowed.

Errors of this type are limits set by the user or environment, not inherent in a specific format or operation that was executed.

`Unsupported(UnsupportedError)`

An operation can not be completed by the chosen abstraction.

This means that it might be possible for the operation to succeed in general but

it requires a disabled feature,
the implementation does not yet exist, or
no abstraction for a lower level could be found.

`IoError(Error)`

An error occurred while interacting with the environment.

Enum captcha_a::ImageError

Variants

Decoding(DecodingError)

Encoding(EncodingError)

Parameter(ParameterError)

Limits(LimitError)

Unsupported(UnsupportedError)

IoError(Error)

Trait Implementations

impl Debug for ImageError

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

impl Display for ImageError

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

impl Error for ImageError

fn source(&self) -> Option<&(dyn Error + 'static)>

fn description(&self) -> &str

fn cause(&self) -> Option<&dyn Error>

fn provide(&'a self, demand: &mut Demand<'a>)

impl From<Error> for ImageError

fn from(error: Error) -> ImageError

impl From<Error> for ImageError

fn from(err: Error) -> ImageError

Auto Trait Implementations

impl !RefUnwindSafe for ImageError

impl Send for ImageError

impl Sync for ImageError

impl Unpin for ImageError

impl !UnwindSafe for ImageError

Blanket Implementations

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<Src, Scheme> ApproxFrom<Src, Scheme> for Srcwhere Scheme: ApproxScheme,

type Err = NoError

fn approx_from(src: Src) -> Result<Src, <Src as ApproxFrom<Src, Scheme>>::Err>

impl<Dst, Src, Scheme> ApproxInto<Dst, Scheme> for Srcwhere Dst: ApproxFrom<Src, Scheme>, Scheme: ApproxScheme,

type Err = <Dst as ApproxFrom<Src, Scheme>>::Err

fn approx_into(self) -> Result<Dst, <Src as ApproxInto<Dst, Scheme>>::Err>

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T, Dst> ConvAsUtil<Dst> for T

fn approx(self) -> Result<Dst, Self::Err>where Self: ApproxInto<Dst, DefaultApprox>,

fn approx_by<Scheme>(self) -> Result<Dst, Self::Err>where Self: ApproxInto<Dst, Scheme>, Scheme: ApproxScheme,

impl<T> ConvUtil for T

fn approx_as<Dst>(self) -> Result<Dst, Self::Err>where Self: ApproxInto<Dst, DefaultApprox>,

fn approx_as_by<Dst, Scheme>(self) -> Result<Dst, Self::Err>where Self: ApproxInto<Dst, Scheme>, Scheme: ApproxScheme,

fn into_as<Dst>(self) -> Dstwhere Self: Into<Dst>,

fn try_as<Dst>(self) -> Result<Dst, Self::Err>where Self: TryInto<Dst>,

fn value_as<Dst>(self) -> Result<Dst, Self::Err>where Self: ValueInto<Dst>,

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T> Pointable for T

const ALIGN: usize = mem::align_of::<T>()

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<E> Provider for Ewhere E: Error + ?Sized,

fn provide(&'a self, demand: &mut Demand<'a>)

impl<T> Same<T> for T

type Output = T

impl<SS, SP> SupersetOf<SS> for SPwhere SS: SubsetOf<SP>,

fn to_subset(&self) -> Option<SS>

fn is_in_subset(&self) -> bool

fn to_subset_unchecked(&self) -> SS

fn from_subset(element: &SS) -> SP

impl<T> ToString for Twhere T: Display + ?Sized,

default fn to_string(&self) -> String

impl<Src> TryFrom<Src> for Src

type Err = NoError

fn try_from(src: Src) -> Result<Src, <Src as TryFrom<Src>>::Err>

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<Src, Dst> TryInto<Dst> for Srcwhere Dst: TryFrom<Src>,

type Err = <Dst as TryFrom<Src>>::Err

`Decoding(DecodingError)`

`Encoding(EncodingError)`

`Parameter(ParameterError)`

`Limits(LimitError)`

`Unsupported(UnsupportedError)`

`IoError(Error)`

impl<T> Any for Twhere
T: 'static + ?Sized,

impl<Src, Scheme> ApproxFrom<Src, Scheme> for Srcwhere
Scheme: ApproxScheme,

impl<Dst, Src, Scheme> ApproxInto<Dst, Scheme> for Srcwhere
Dst: ApproxFrom<Src, Scheme>,
Scheme: ApproxScheme,

impl<T> Borrow<T> for Twhere
T: ?Sized,

impl<T> BorrowMut<T> for Twhere
T: ?Sized,

fn approx(self) -> Result<Dst, Self::Err>where
Self: ApproxInto<Dst, DefaultApprox>,

fn approx_by<Scheme>(self) -> Result<Dst, Self::Err>where
Self: ApproxInto<Dst, Scheme>,
Scheme: ApproxScheme,

fn approx_as<Dst>(self) -> Result<Dst, Self::Err>where
Self: ApproxInto<Dst, DefaultApprox>,

fn approx_as_by<Dst, Scheme>(self) -> Result<Dst, Self::Err>where
Self: ApproxInto<Dst, Scheme>,
Scheme: ApproxScheme,

fn into_as<Dst>(self) -> Dstwhere
Self: Into<Dst>,

fn try_as<Dst>(self) -> Result<Dst, Self::Err>where
Self: TryInto<Dst>,

fn value_as<Dst>(self) -> Result<Dst, Self::Err>where
Self: ValueInto<Dst>,

impl<T, U> Into<U> for Twhere
U: From<T>,

impl<E> Provider for Ewhere
E: Error + ?Sized,

impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,

impl<T> ToString for Twhere
T: Display + ?Sized,

impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

impl<Src, Dst> TryInto<Dst> for Srcwhere
Dst: TryFrom<Src>,

impl<T, U> TryInto<U> for Twhere
U: TryFrom<T>,

impl<V, T> VZip<V> for Twhere
V: MultiLane<T>,

impl<Src, Dst> ValueInto<Dst> for Srcwhere
Dst: ValueFrom<Src>,