Enum UnsupportedFeature 

#[non_exhaustive]
pub enum UnsupportedFeature {
    ProgressiveJpeg,
    ExtendedSequentialJpeg,
    ArithmeticCodedJpeg,
    LosslessJpeg,
    HierarchicalJpeg,
    JpegPrecision {
        bits: u8,
    },
    JpegComponentCount {
        components: u8,
    },
    PngNotEnabled,
    JpegChromaSubsampling,
}

A specific image-format feature that the codec does not implement.

Carried by CodecError::Unsupported. Use this to distinguish “the byte string is well-formed but uses a feature we don’t decode” from “the byte string is corrupt” (CodecError::InvalidData).

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ProgressiveJpeg

JPEG SOF2 (progressive baseline).

ExtendedSequentialJpeg

JPEG SOF1 (extended sequential, Huffman coded).

ArithmeticCodedJpeg

JPEG SOF9/SOF10/SOF11/SOF13/SOF14/SOF15 (arithmetic coding, in all sequential/progressive/lossless/hierarchical flavours).

LosslessJpeg

JPEG SOF3 (lossless predictive).

HierarchicalJpeg

JPEG SOF5/SOF6/SOF7 (hierarchical).

JpegPrecision

JPEG sample precision other than 8 bits per channel.

Fields

bits: u8

The unsupported precision reported in the SOF marker.

JpegComponentCount

JPEG with a component count we do not handle (anything other than 1 for greyscale or 3 for YCbCr).

Fields

components: u8

The unsupported component count reported in the SOF marker.

PngNotEnabled

PNG data was recognised but the png feature is disabled in this build.

JpegChromaSubsampling

JPEG chroma subsampling configuration where a chroma component is sampled at a higher rate than luma along some axis (rejected so the downstream upsampler does not divide by zero).

Trait Implementations

impl Clone for UnsupportedFeature

fn clone(&self) -> UnsupportedFeature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UnsupportedFeature

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

Formats the value using the given formatter.

impl Display for UnsupportedFeature

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

Formats the value using the given formatter.

impl Eq for UnsupportedFeature

impl PartialEq for UnsupportedFeature

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for UnsupportedFeature