Struct MultiplyLayerFactors 

pub struct MultiplyLayerFactors {
    pub size: PixelSize,
    pub rgba: Arc<Vec<u8>>,
    pub scale: f32,
}

The per-channel factors of a multiply layer: an opaque RGBA image whose channels, divided by 255 and times scale, are the factors of the red, green and blue channels.

Fields

size: PixelSize

The size of the image in samples.

rgba: Arc<Vec<u8>>

The samples, row by row from the top, 4 bytes each (the fourth 255).

scale: f32

What a sample of 255 stands for (1 or more).

Implementations

impl MultiplyLayerFactors

pub fn factor_at(&self, u: f64, v: f64) -> [f32; 3]

The factors of the red, green and blue channels at (u, v) of the unit square of the image (0 to 1 across it), sampled bilinearly between the centres of the samples, as the backends sample a bitmap.

pub fn apply_to_premultiplied_rgba8( &self, rgba: &mut [u8], width: usize, to_unit: impl Fn(f64, f64) -> Option<(f64, f64)>, )

Multiplies the premultiplied RGBA pixels rgba (row by row, width pixels a row) by the factors; to_unit maps the centre of a pixel to the unit square of the factors (None outside them: the pixel is cleared, as nothing outside the bounds of the layer is kept).

Trait Implementations

impl Clone for MultiplyLayerFactors

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MultiplyLayerFactors

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

Formats the value using the given formatter.

impl PartialEq for MultiplyLayerFactors

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MultiplyLayerFactors