Custom cursor icons

[valaphee]

At the moment there is no way to use custom cursor icons (except doing it manually).

All major platforms should support custom cursors even on web.

Loading cursor icons would work the same way as other icons on Windows (LoadImageW), but would require a new method in Window or not using "cursor_icon" and adding a new variant "Custom" to CursorIcon.

[madsmtm]

There are a number of PRs on this:

• Add custom cursor icon support on Windows #1617
• Add RGBA cursor icon support on Windows/macOS/Linux #2117
• Add support of using custom image as cursor icon on windows #2833
• Custom cursor icon support #3039
• Custom cursor images for all desktop platforms #3218

Biggest problem is how to design the desired API for this.

[kchibisov]

I guess we could do something like

pub enum CursorIcon {
    Named(CursorIcon), // from crate
    Raw(Buffer),
}

The issue is that on Wayland you'd need a scaling, but we can accept physical and say that we'll scale based on display resolution?

[valaphee]

What was the reason why CursorIcon resides in its own crate? I found this pr bd9cc2a but I don't think its really worth being in its own crate.

[kchibisov]

@valaphee it's used by multiple crates(not only winit) and just encodes w3c icons

[Friz64]

#3218 has been merged 🎉