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This is built over the tiny-skia API (which is already used by the
Svg
widget).The canvas has a built-in cache since it is rendered on the CPU then uploaded as a GPU texture.
Potentially we could add other canvas widgets over other draw APIs in the future, in which case this widget should be renamed.
Note there is already another option for drawing: constructing a new widget with code in the
Layout::draw
implementation (not cached); see e.g.clock
ormandlebrot
examples.Also: some optimisations to text drawing.