devela::_dep::image::codecs::pnm

Struct PnmHeader

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pub struct PnmHeader { /* private fields */ }

Available on crate feature dep_image only.

Expand description

Stores the complete header data of a file.

Internally, provides mechanisms for lossless reencoding. After reading a file with the decoder it is possible to recover the header and construct an encoder. Using the encoder on the just loaded image should result in a byte copy of the original file (for single image pnms without additional trailing data).

Implementations§

impl PnmHeader

pub fn subtype(&self) -> PnmSubtype

Retrieve the format subtype from which the header was created.

pub fn width(&self) -> u32 ⓘ

The width of the image this header is for.

pub fn height(&self) -> u32 ⓘ

The height of the image this header is for.

pub fn maximal_sample(&self) -> u32 ⓘ

The biggest value a sample can have. In other words, the colour resolution.

pub fn as_bitmap(&self) -> Option<&BitmapHeader> ⓘ

Retrieve the underlying bitmap header if any

pub fn as_graymap(&self) -> Option<&GraymapHeader> ⓘ

Retrieve the underlying graymap header if any

pub fn as_pixmap(&self) -> Option<&PixmapHeader> ⓘ

Retrieve the underlying pixmap header if any

pub fn as_arbitrary(&self) -> Option<&ArbitraryHeader> ⓘ

Retrieve the underlying arbitrary header if any

pub fn write(&self, writer: &mut dyn Write) -> Result<(), Error> ⓘ

Write the header back into a binary stream

Trait Implementations§

impl From<ArbitraryHeader> for PnmHeader

fn from(header: ArbitraryHeader) -> PnmHeader

Converts to this type from the input type.

impl From<BitmapHeader> for PnmHeader

fn from(header: BitmapHeader) -> PnmHeader

Converts to this type from the input type.

impl From<GraymapHeader> for PnmHeader

fn from(header: GraymapHeader) -> PnmHeader

Converts to this type from the input type.

impl From<PixmapHeader> for PnmHeader

fn from(header: PixmapHeader) -> PnmHeader

Converts to this type from the input type.

Auto Trait Implementations§

impl Freeze for PnmHeader

impl RefUnwindSafe for PnmHeader

impl Send for PnmHeader

impl Sync for PnmHeader

impl Unpin for PnmHeader

impl UnwindSafe for PnmHeader

Blanket Implementations§

impl<T> Any for T
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const BYTE_ALIGN: usize = _

The alignment of this type in bytes.

const BYTE_SIZE: usize = _

The size of this type in bytes.

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fn mem_copy(&self) -> Self
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fn mem_drop(self)
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Replaces self with other, returning the previous value of self. Read more

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Swaps the value of self and other without deinitializing either one. Read more

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fn from(t: T) -> T

Returns the argument unchanged.

impl<S> FromSample<S> for S

fn from_sample_(s: S) -> S

impl<T> Hook for T

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fn into_sample(self) -> T

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type Init = T

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impl<T, U> ToSample<U> for T
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fn to_sample_(self) -> U

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