How to resize NSImage?

Question

I have an NSBitmapImageRep which is WxH size.

I create NSImage and call addRepresentation:. Then I n

Answer 1

Actually it is not necessary to modify any source image parameters like size. The following snippet is already in Swift, but I think you can infer the Objective-C version from it:

func resized(to: CGSize) -> NSImage {
    let img = NSImage(size: to)

    img.lockFocus()
    defer {
        img.unlockFocus()
    }

    if let ctx = NSGraphicsContext.current {
        ctx.imageInterpolation = .high
        draw(in: NSRect(origin: .zero, size: to),
             from: NSRect(origin: .zero, size: size),
             operation: .copy,
             fraction: 1)
    }

    return img
}