Bitmap

Easy low-overhead access to individual pixels.

Bitmap uses low-level data pointers to reduce overhead in working with CGImage.

It allows you to get and set pixels directly through a 2-argument subscript, as well as offering various bulk creation/modification operations.

Example

Identify pixels that are neither fully opaque nor fully transparent and turn them red, clearing the rest.

for y in 0..<bitmap.height {
    for x in 0..<bitmap.width {
        if case 1...254 = bitmap[x, y].alpha {
            bitmap[x, y] = .red
        } else {
            bitmap[x, y] = .clear
        }
    }
}

turns this	into this

For more examples, please take a look at the unit tests. All non-trivial public endpoints have documentation attached too, so it shouldn’t be too hard to figure out how everything works if you just play around a little.