Struct FunctionPattern 

pub struct FunctionPattern { /* private fields */ }

A shading pattern driven by an arbitrary f(x, y) → [R, G, B] closure.

The closure is boxed so it can capture ICC profiles, LUTs, or any other per-page state from pdf_bridge. It must be Send + Sync because Pattern is used across rayon threads.

Implementations

impl FunctionPattern

pub fn new<F>(func: F) -> Self

where F: Fn(f64, f64) -> [u8; 3] + Send + Sync + 'static,

Create a function-based pattern from a closure f(x, y) → [R, G, B].

x and y are the pixel-centre coordinates in device space.

Trait Implementations

impl Pattern for FunctionPattern

fn fill_span(&self, y: i32, x0: i32, x1: i32, out: &mut [u8])

Fill out with colour bytes for pixels x0..=x1 on scanline y.

fn is_static_color(&self) -> bool

Return true if this pattern yields the same colour at every coordinate. When true, fill_span will be called once and the result reused across the whole span (optimisation hint only — correctness is not affected).