Module dct97_2d 

Constrained 2D DCT to irreversible 9/7 wavelet transforms.

The production float path performs a separable 8x8 IDCT into a reusable spatial plane, then applies the separable single-level 9/7 transform.

Structs

Dct97GridError

Error returned when a DCT block grid cannot cover the requested component.

Dct97GridScratch

Scratch storage for repeated DCT-grid to 9/7 transform calls.

Dwt97TwoDimensional

One separable single-level 2D 9/7 transform result.

Functions

dct8x8_blocks_then_dwt97_float

Reference path for a DCT block grid: DCT coefficients -> float IDCT samples -> separable linearized 9/7.

dct8x8_blocks_then_dwt97_float_with_scratch

Reference 9/7 path with caller-owned spatial-sample scratch: DCT coefficients -> float IDCT samples -> separable linearized 9/7.