Struct CoeffContext 

pub struct CoeffContext {
    pub tx_size: TxSize,
    pub tx_type: TxType,
    pub plane: u8,
    pub scan_pos: u16,
    pub eob: u16,
    pub levels: Vec<i32>,
    pub signs: Vec<bool>,
    pub left_ctx: Vec<u8>,
    pub above_ctx: Vec<u8>,
    pub block_width: u8,
    pub block_height: u8,
}

Context for coefficient parsing state.

Fields

tx_size: TxSize

Transform size.

tx_type: TxType

Transform type.

plane: u8

Plane index (0=Y, 1=U, 2=V).

scan_pos: u16

Current scan position.

eob: u16

End of block position.

levels: Vec<i32>

Coefficient levels (dequantized).

signs: Vec<bool>

Sign bits.

left_ctx: Vec<u8>

Accumulated left context.

above_ctx: Vec<u8>

Accumulated above context.

block_width: u8

Block width in 4x4 units.

block_height: u8

Block height in 4x4 units.

Implementations

impl CoeffContext

pub fn new(tx_size: TxSize, tx_type: TxType, plane: u8) -> Self

Create a new coefficient context.

pub fn reset(&mut self)

Reset the context for a new block.

pub fn tx_class(&self) -> TxClass

Get the transform class.

pub fn get_scan_position(&self, idx: usize) -> (u32, u32)

Get scan position for a coefficient index.

pub fn get_coeff_index(&self, row: u32, col: u32) -> usize

Get coefficient index from row and column.

pub fn compute_level_context(&self, pos: usize) -> LevelContext

Compute level context for a position.

pub fn dc_sign_context(&self) -> u8

Get DC sign context.

pub fn set_coeff(&mut self, pos: usize, level: i32, sign: bool)

Set coefficient value at position.

pub fn get_coeff(&self, pos: usize) -> i32

Get coefficient value at position.

pub fn has_nonzero(&self) -> bool

Check if block has any non-zero coefficients.

pub fn count_nonzero(&self) -> u16

Get the number of non-zero coefficients.

Trait Implementations

impl Clone for CoeffContext

fn clone(&self) -> CoeffContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CoeffContext

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

Formats the value using the given formatter.

impl Default for CoeffContext

fn default() -> Self

Returns the “default value” for a type.