Struct Mask 

pub struct Mask<'a> { /* private fields */ }

A borrowed 8-bit coverage mask: 0 transparent, 255 fully covered.

Implementations

impl<'a> Mask<'a>

pub fn new( data: &'a [u8], width: i32, height: i32, stride: usize, ) -> Option<Mask<'a>>

Wraps a coverage buffer. Returns None if it is too small for the geometry, or if stride is narrower than width.

pub fn packed(data: &'a [u8], width: i32, height: i32) -> Option<Mask<'a>>

A mask whose rows are contiguous.

pub const fn width(&self) -> i32

Width in pixels.

pub const fn height(&self) -> i32

Height in pixels.

pub const fn bounds_at(&self, at: Point) -> Rect

Extent as a rectangle placed at at.

pub const fn stride(&self) -> usize

The stride between rows, in bytes.

pub fn sub(&self, rect: Rect) -> Option<Mask<'a>>

The part of this mask inside rect, sharing its bytes.

None if rect is empty or reaches outside the mask. This is how a glyph is cut from an atlas page without copying it.

pub fn row(&self, y: i32) -> &'a [u8]

The coverage values of row y, which the caller must know is in range.

Trait Implementations

impl<'a> Clone for Mask<'a>

fn clone(&self) -> Mask<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Mask<'a>

impl<'a> Debug for Mask<'a>

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

Formats the value using the given formatter.