Struct footile::Mask
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pub struct Mask { /* fields omitted */ }A Mask is an image with only an 8-bit alpha channel.
It can be obtained from a Plotter after plotting. A Raster can be composited with a Mask.
Example
use footile::PlotterBuilder; let mut p = PlotterBuilder::new().build(); p.move_to(10f32, 10f32) .line_to(90f32, 90f32) .stroke(); let m = p.mask();