no glow in CairoMakie

[aplavin]

Running text((0,0), text="abc", glowwidth=5, glowcolor=:red) shows glow with the GLMakie backend, but just shows the raw text (without glow) with CairoMakie.
Would be nice to support it for Cairo as well, including pdf exports :)

• what version of Makie are you running? (]st -m Makie) latest, 0.21.16
• can you reproduce the bug with a fresh environment ? (]activate --temp; add Makie) yes
• What platform + GPU are you on? any

[asinghvi17]

Is there a way to do that in base Cairo? A quick google reveals https://stackoverflow.com/questions/9630008/how-can-i-create-a-glow-around-a-rectangle-with-svg, but those are all SVG filters, which Cairo doesn't provide access to :(

[aplavin]

I'm not very familiar with Cairo, but they seem to have the ability to blur an object after rendering. And "text with glow" is basically "blurred text + regular text on top".

[asinghvi17]

That looks like it's only when rendering to image surfaces though, so for things like SVG output it would either fail or trigger rasterization. Not what one wants!

One more reason to build an SVGMakie I guess :D