How can I convert slint::Image to Vec<u8>?

[Horbin-Magician]

I use the screenshots crate to take a screen shot, and convert the picture into a slint::Image.
After that, how can I save the picture into a .png file?
Maybe I need to convert slint::Image to Vec.

[tronical]

There's currently no way to get the data out of a slint::Image, but as you create the slint::Image yourself from the data from the screenshots crate, you get an RgbaImage, and that one has a save_with_format function, which you can call to save the data to a .png file.

[Horbin-Magician]

This means I need to keep two copies of the image in memory.
Is there really no better way?

[tronical]

When you create the slint::Image, you'll likely use something like from_rgba8. That function takes a SharedPixelBuffer, which you must have created. Since that one is shared, you can keep a clone around of it for free. And later when you want to save it to a .png file, you can access the data as_bytes() and call save_buffer to encode and write to a file.

That way there's only a single copy of the image in memory.

[Horbin-Magician]

I get it. Thank you for your reply.