Image Encoding

To encode images, use types conforming to the ImageEncoding protocol:

public protocol ImageEncoding: Sendable {
    /// Encodes the given image.
    func encode(_ image: PlatformImage) -> Data?

    /// An optional method which encodes the given image container.
    func encode(_ container: ImageContainer, context: ImageEncodingContext) -> Data?
}

There is currently no dedicated image encoder registry. Use the pipeline configuration to register custom encoders using ImagePipeline/Configuration-swift.struct/makeImageEncoder.

Built-In Image Encoders

You can find all of the built-in encoders in the ImageEncoders namespace.

ImageEncoders.Default

ImageEncoders/Default encodes opaque images as jpeg and images with opacity as png. It can also be configured to use heif instead of jpeg using ImageEncoders/Default/isHEIFPreferred option.

ImageEncoders.ImageIO

ImageEncoders/ImageIO is an Image I/O based encoder.

Image I/O is a system framework that allows applications to read and write most image file formats. This framework offers high efficiency, color management, and access to image metadata.

let image: UIImage
let encoder = ImageEncoders.ImageIO(type: .heif, compressionRatio: 0.8)
let data = encoder.encode(image: image)