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.

Trait Implementations

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

The lower-level source of this error, if any. Read more

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

Returns a stack backtrace, if available, of where this error occurred. Read more

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

Performs the conversion.

Performs the conversion.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The alignment of pointer.

The type for initializers.

Initializes a with the given initializer. Read more

Dereferences the given pointer. Read more

Mutably dereferences the given pointer. Read more

Drops the object pointed to by the given pointer. Read more

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.