Enum Compression 

pub enum Compression {
    None,
    CcittRle,
    CcittGroup3Fax,
    CcittGroup4Fax,
    Lzw,
    OldJpeg,
    Jpeg,
    Deflate,
    PackBits,
}

A compression scheme applied to a strip or tile of image data.

The discriminants are documented with their on-disk Compression tag values.

Variants

None

1 — no compression; samples are packed into bytes as tightly as possible.

CcittRle

2 — CCITT Group 3 1-Dimensional Modified Huffman run-length encoding (TIFF 6.0 §10).

CcittGroup3Fax

3 — CCITT T.4 (Group 3) bilevel fax encoding (TIFF 6.0 §11).

CcittGroup4Fax

4 — CCITT T.6 (Group 4) bilevel fax encoding (TIFF 6.0 §11).

Lzw

5 — LZW (TIFF 6.0 §13).

OldJpeg

6 — the deprecated old-style JPEG process (TIFF 6.0 §22).

Jpeg

7 — JPEG (the redefined “new-style” process; TIFF Technical Note 2).

Deflate

8 — Deflate/zlib (Adobe). Post-6.0 extension; out of the current campaign’s scope.

PackBits

32773 — PackBits, a simple byte-oriented run-length scheme (TIFF 6.0 §9).

Implementations

impl Compression

pub fn from_code(code: u32) -> Option<Self>

Returns the scheme for an on-disk Compression tag value, or None if unrecognised.

pub fn code(self) -> u16

Returns the on-disk Compression tag value.

Trait Implementations

impl Clone for Compression

fn clone(&self) -> Compression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Compression

impl Debug for Compression

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

Formats the value using the given formatter.

impl Default for Compression

fn default() -> Compression

Returns the “default value” for a type.

impl Eq for Compression

impl PartialEq for Compression

fn eq(&self, other: &Compression) -> 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 StructuralPartialEq for Compression