Enum PdfFunction 

pub enum PdfFunction {
    Sampled {
        domain: Vec<[f64; 2]>,
        range: Vec<[f64; 2]>,
        size: Vec<u32>,
        bps: u32,
        encode: Vec<[f64; 2]>,
        decode: Vec<[f64; 2]>,
        samples: Vec<f64>,
        n_outputs: usize,
    },
    Exponential {
        domain: Vec<[f64; 2]>,
        range: Vec<[f64; 2]>,
        c0: Vec<f64>,
        c1: Vec<f64>,
        n: f64,
    },
    Stitching {
        domain: Vec<[f64; 2]>,
        range: Vec<[f64; 2]>,
        functions: Vec<PdfFunction>,
        bounds: Vec<f64>,
        encode: Vec<[f64; 2]>,
    },
    Calculator {
        domain: Vec<[f64; 2]>,
        range: Vec<[f64; 2]>,
        tokens: Vec<CalcToken>,
    },
    Composite {
        functions: Vec<PdfFunction>,
    },
}

A parsed PDF function.

Variants

Sampled

Type 0: Sampled function.

Fields

domain: Vec<[f64; 2]>

range: Vec<[f64; 2]>

size: Vec<u32>

bps: u32

encode: Vec<[f64; 2]>

decode: Vec<[f64; 2]>

samples: Vec<f64>

n_outputs: usize

Exponential

Type 2: Exponential interpolation.

Fields

domain: Vec<[f64; 2]>

range: Vec<[f64; 2]>

c0: Vec<f64>

c1: Vec<f64>

n: f64

Stitching

Type 3: Stitching function.

Fields

domain: Vec<[f64; 2]>

range: Vec<[f64; 2]>

functions: Vec<PdfFunction>

bounds: Vec<f64>

encode: Vec<[f64; 2]>

Calculator

Type 4: PostScript calculator.

Fields

domain: Vec<[f64; 2]>

range: Vec<[f64; 2]>

tokens: Vec<CalcToken>

Composite

Array of functions whose outputs are concatenated. Used when a shading’s /Function is an array of per-component functions.

Fields

functions: Vec<PdfFunction>

Implementations

impl PdfFunction

pub fn parse(obj: &PdfObj, resolver: &Resolver<'_>) -> Result<Self, PdfError>

Parse a PDF function from a dict/stream object.

pub fn evaluate(&self, inputs: &[f64]) -> Vec<f64>

Evaluate the function for given inputs.

pub fn composite(functions: Vec<PdfFunction>) -> Self

Create a composite function from an array of per-component functions.

pub fn domain_0(&self) -> [f64; 2]

Get the first input dimension’s domain [min, max].

pub fn n_outputs(&self) -> usize

Number of output values.

pub fn discontinuity_positions(&self) -> Vec<f64>

Collect input values where this function has discontinuities (stitching bounds). Returns values in the function’s input domain, NOT normalized to [0,1].

pub fn min_samples(&self) -> usize

Minimum number of samples needed to faithfully reproduce this function. For Type 0 (sampled) functions, returns the first dimension’s sample count. For stitching functions, sums the sub-functions’ sample counts. For other types, returns 0 (use caller’s default).

Trait Implementations

impl Clone for PdfFunction

fn clone(&self) -> PdfFunction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PdfFunction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.