Struct CostMap 

pub struct CostMap { /* private fields */ }

Per-coefficient embedding costs for one image component.

Stored in the same block-raster order as DctGrid: block index * 64 + row * 8 + col. DC positions (index % 64 == 0) always have WET_COST.

Uses f32 storage to halve memory usage (~46 MB instead of ~93 MB for a 4032x3024 image). f32 has more than enough precision for cost ranking.

Implementations

impl CostMap

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

pub fn blocks_wide(&self) -> usize

pub fn blocks_tall(&self) -> usize

pub fn total_blocks(&self) -> usize

pub fn get(&self, br: usize, bc: usize, i: usize, j: usize) -> f32

Get the cost at block (br, bc), frequency position (i, j).

pub fn set(&mut self, br: usize, bc: usize, i: usize, j: usize, val: f32)

Set the cost at block (br, bc), frequency position (i, j).