Struct Adam7Info 

pub struct Adam7Info {
    pub(crate) pass: u8,
    pub(crate) line: u32,
    pub(crate) width: u32,
    pub(crate) samples: u32,
}

Describes which stage of the Adam7 algorithm applies to a decoded row.

See also Reader::next_interlaced_row.

Fields

pass: u8

The Adam7 pass number, 1..7.

line: u32

The index of the line within this pass.

width: u32

The original pixel count.

samples: u32

How many Adam7 samples there are.

Implementations

impl Adam7Info

pub fn new(pass: u8, line: u32, width: u32) -> Self

Creates a new Adam7Info. May panic if the arguments are out of range (e.g. if pass is 0 or greater than 8).

• pass corresponds to a pass of the the Adam7 algorithm
• line is the number of a line within a pass (starting with 0). For example, in an image of height 8, line can be beteween 0..4 in the 7th pass (those 4 interlaced rows correspond to 2nd, 4th, 6th, and 8th row of the full image).
• width describes how many pixels are in a full row of the image. The bytes in each passline of the Adam7 are calculated from this number.

Note that in typical usage, Adam7Infos are returned by Reader::next_interlaced_row and there is no need to create them by calling Adam7Info::new. Adam7Info::new is nevertheless exposed as a public API, because it helps to provide self-contained example usage of expand_interlaced_row.

fn pass_constants(&self) -> PassConstants

fn splat_pixel_repeat(self, idx: usize) -> u8

How often to repeat a pixel.

fn splat_line_repeat(self, height: u32) -> u8

Trait Implementations

impl Clone for Adam7Info

fn clone(&self) -> Adam7Info

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Adam7Info

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

Formats the value using the given formatter.

impl PartialEq for Adam7Info

fn eq(&self, other: &Adam7Info) -> 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 Copy for Adam7Info

impl Eq for Adam7Info

impl StructuralPartialEq for Adam7Info