Struct SpanImageFilterBase 

pub struct SpanImageFilterBase<'a, I> { /* private fields */ }

Base state for image filter span generators.

Holds a reference to the interpolator and optional filter LUT, plus the subpixel offset (dx, dy) applied to coordinates before filtering.

Port of C++ span_image_filter<Source, Interpolator> (without the source, which is handled by the concrete span generator).

Implementations

impl<'a, I> SpanImageFilterBase<'a, I>

pub fn new(interpolator: &'a mut I, filter: Option<&'a ImageFilterLut>) -> Self

Create a new base with interpolator, optional filter, and default 0.5 offset.

pub fn interpolator(&self) -> &I

pub fn interpolator_mut(&mut self) -> &mut I

pub fn filter(&self) -> Option<&ImageFilterLut>

pub fn filter_dx_int(&self) -> u32

pub fn filter_dy_int(&self) -> u32

pub fn filter_dx_dbl(&self) -> f64

pub fn filter_dy_dbl(&self) -> f64

pub fn set_filter_offset(&mut self, dx: f64, dy: f64)

Set the subpixel filter offset.

The offset shifts coordinates before filtering. Default is (0.5, 0.5) which centers the filter kernel on pixel centers.

pub fn set_filter_offset_uniform(&mut self, d: f64)

Set equal filter offset for both axes.

pub fn set_filter(&mut self, filter: &'a ImageFilterLut)

Set the filter LUT.

pub fn prepare(&self)

No-op prepare (matches C++ span_image_filter::prepare()).