Module canvas 

Structs

CanvasFont

CanvasGradientStop

CanvasId

CompositionOptions

GlyphAndPosition

IndexSizeError

LineOptions

LinearGradientStyle

Path

RadialGradientStyle

ShadowOptions

SurfaceStyle

TextRun

Enums

BlendingStyle

https://drafts.fxtf.org/compositing/#ltblendmodegt

Canvas2dMsg

CanvasMsg

CompositionOrBlending

CompositionStyle

https://drafts.fxtf.org/compositing/#compositemode

FillOrStrokeStyle

FillRule

LineCapStyle

LineJoinStyle

RepetitionStyle