Struct DctGrid 

pub struct DctGrid { /* private fields */ }

Grid of quantized DCT coefficients for one image component.

Coefficients are stored in block-raster order. Within each block, the 64 coefficients are in natural (row-major) order, i.e. index = row * 8 + col.

Implementations

impl DctGrid

pub fn new(blocks_wide: usize, blocks_tall: usize) -> Self

Create a new grid initialized to zero.

pub fn blocks_wide(&self) -> usize

pub fn blocks_tall(&self) -> usize

pub fn get(&self, br: usize, bc: usize, i: usize, j: usize) -> i16

Get a coefficient value.

• br, bc: block row and column (0-based)
• i, j: frequency row and column within the block (0–7)

pub fn set(&mut self, br: usize, bc: usize, i: usize, j: usize, val: i16)

Set a coefficient value.

pub fn block_mut(&mut self, br: usize, bc: usize) -> &mut [i16]

Get a mutable reference to the 64-coefficient block at (br, bc).

pub fn block(&self, br: usize, bc: usize) -> &[i16]

Get a reference to the 64-coefficient block at (br, bc).

pub fn total_blocks(&self) -> usize

Total number of blocks.

pub fn coeffs_mut(&mut self) -> &mut [i16]

Raw mutable access to all coefficients.

Layout: blocks_tall * blocks_wide * 64 contiguous i16 values in block-raster order. Each 64-element chunk is one 8×8 block. Used by parallel processing (Rayon par_chunks_mut).

pub fn coeffs(&self) -> &[i16]

Raw read-only access to all coefficients.

Trait Implementations

impl Clone for DctGrid

fn clone(&self) -> DctGrid

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DctGrid

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

Formats the value using the given formatter.