Struct ColorCache 

pub struct ColorCache { /* private fields */ }

A VP8L color cache: 2^bits slots, each holding one ARGB color, all initialized to zero.

Implementations

impl ColorCache

pub fn new(bits: u32) -> Result<Self>

Creates a cache with bits (1..=11) hash bits and 2^bits zeroed slots.

Errors

Returns Error::InvalidInput if bits is outside 1..=11.

pub fn size(&self) -> usize

Number of slots (2^bits), which is also the size of the color-cache alphabet.

pub fn slot(&self, color: u32) -> usize

The hash slot a color maps to.

pub fn insert(&mut self, color: u32)

Inserts color, overwriting whatever shared its slot.

pub fn lookup(&self, index: u32) -> u32

Returns the color stored at index (the decoded cache code). Out-of-range indices yield 0, but callers bound index by size via the green alphabet.

Trait Implementations

impl Clone for ColorCache

fn clone(&self) -> ColorCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColorCache

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

Formats the value using the given formatter.