Enum RenderOutput 

pub enum RenderOutput {
    Greyscale(Bitmap),
    Color(ColorBitmap),
    Sdf {
        width: u32,
        height: u32,
        data: Vec<u8>,
    },
    Lcd(LcdBitmap),
    Msdf {
        width: u32,
        height: u32,
        data: Vec<u8>,
    },
}

Unified per-glyph render output.

Lets a rendering pipeline return greyscale, color, SDF, LCD subpixel, or multi-channel SDF output through a single channel so callers can handle a mixed set of glyphs uniformly.

Variants

Greyscale(Bitmap)

A greyscale coverage bitmap.

Color(ColorBitmap)

An RGBA color bitmap (color fonts).

Sdf

A single-channel signed-distance-field tile (width * height bytes).

Fields

width: u32

Tile width in pixels.

height: u32

Tile height in pixels.

data: Vec<u8>

SDF bytes (< 128 outside, ≈ 128 outline, > 128 inside).

Lcd(LcdBitmap)

An LCD subpixel bitmap (three bytes per pixel: R, G, B channels).

Used for ClearType / FreeType LCD rendering to achieve sub-pixel horizontal precision on colour LCD displays.

Msdf

A multi-channel signed-distance-field tile.

MSDF encodes the distance field across three independent colour channels to resolve corner artefacts that appear in single-channel SDF at large magnifications. The data layout is width * height * 3 bytes (RGB).

Fields

width: u32

Tile width in pixels.

height: u32

Tile height in pixels.

data: Vec<u8>

MSDF bytes in RGB order: width * height * 3 bytes.

Implementations

impl RenderOutput

pub fn into_bitmap(self) -> Option<Bitmap>

Extracts the greyscale Bitmap from a RenderOutput::Greyscale variant, returning None for all other variants.

Trait Implementations

impl Clone for RenderOutput

fn clone(&self) -> RenderOutput

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RenderOutput

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

Formats the value using the given formatter.

impl From<RenderOutput> for Option<Bitmap>

fn from(output: RenderOutput) -> Self

Converts a RenderOutput into Some(Bitmap) for the greyscale variant, or None for all other variants.