Enum png::decoder::interlace_info::InterlaceInfo

pub enum InterlaceInfo {
    Null(NullInfo),
    Adam7(Adam7Info),
}

Describes which interlacing algorithm applies to a decoded row.

PNG (2003) specifies two interlace modes, but reserves future extensions.

See also Reader.next_interlaced_row.

Variants

Null(NullInfo)

The null method means no interlacing.

Adam7(Adam7Info)

The Adam7 algorithm derives its name from doing 7 passes over the image, only decoding a subset of all pixels in each pass. The following table shows pictorially what parts of each 8x8 area of the image is found in each pass:

1 6 4 6 2 6 4 6
7 7 7 7 7 7 7 7
5 6 5 6 5 6 5 6
7 7 7 7 7 7 7 7
3 6 4 6 3 6 4 6
7 7 7 7 7 7 7 7
5 6 5 6 5 6 5 6
7 7 7 7 7 7 7 7

Implementations

impl InterlaceInfo

pub(crate) fn line_number(&self) -> u32

pub(crate) fn get_adam7_info(&self) -> Option<&Adam7Info>

Trait Implementations

impl Clone for InterlaceInfo

fn clone(&self) -> InterlaceInfo

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for InterlaceInfo

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

Formats the value using the given formatter.

impl Copy for InterlaceInfo