Struct LutKernel 

pub struct LutKernel { /* private fields */ }

Lookup table (LUT) based color transformation

Implementations

impl LutKernel

pub fn new(lut_size: usize) -> Self

Create a new LUT kernel

Arguments

• lut_size - Size of the LUT (typically 256 for 1D or 33 for 3D)

pub fn lut_size(&self) -> usize

Get the LUT size

pub fn apply_1d( &self, _device: &GpuDevice, input: &[u8], output: &mut [u8], lut: &[u8], _width: u32, _height: u32, ) -> Result<()>

Apply 1D LUT transformation (CPU fallback).

The LUT layout is [CH0_LUT[0..lut_size], CH1_LUT[0..lut_size], …]. For each pixel and each channel c, the output value is lut[c * lut_size + idx] where idx = (pixel_value * (lut_size-1)) / 255.

Pixels and the LUT are treated as having the same number of channels, inferred from lut.len() / lut_size. If lut.len() is not a multiple of lut_size, the extra channel bytes are copied unchanged.

Arguments

• _device - GPU device (CPU fallback: unused)
• input - Input image buffer
• output - Output image buffer (same length as input)
• lut - 1D lookup table (size: lut_size * channels)
• _width - Image width (unused; length is inferred from buffers)
• _height - Image height (unused; length is inferred from buffers)

Errors

Returns an error if lut_size is zero or the LUT is empty.

pub fn apply_3d( &self, _device: &GpuDevice, input: &[u8], output: &mut [u8], lut: &[f32], _width: u32, _height: u32, ) -> Result<()>

Apply 3D LUT transformation with trilinear interpolation (CPU fallback).

The LUT is a cubic grid of size N × N × N (where N = lut_size) storing RGB triplets, laid out as lut[(r_idx * N*N + g_idx * N + b_idx) * 3 + channel].

Input pixels are expected to be interleaved 3-channel (RGB) data. Any extra channels beyond the first three are passed through unchanged.

Arguments

• _device - GPU device (CPU fallback: unused)
• input - Input image buffer (interleaved RGB, 3 bytes per pixel minimum)
• output - Output image buffer (same length as input)
• lut - 3D LUT (lut_size^3 * 3 f32 entries, values in [0.0, 1.0])
• _width - Image width (unused; length is inferred from buffers)
• _height - Image height (unused; length is inferred from buffers)

Errors

Returns an error if lut_size is zero or the LUT is too small.