ImageDecoder.ImageDecoder()

The ImageDecoder() constructor creates a new ImageDecoder object which unpacks and decodes image data.

init

An object containing the following members:

type

A string containing the MIME type of the image file to be decoded.

data

A BufferSource or ReadableStream of bytes representing an encoded image type as described by type.

premultiplyAlpha Optional

One of the following, if not provided set as "default":

• "none"
• "premultiply"
• "default"

colorSpaceConversion Optional

One of the following, if not provided set as "default":

• "none"
• "default"

desiredWidth Optional

An integer indicating the desired width for the decoded output.

desiredHeight Optional

An integer indicating the desired height for the decoded output.

preferAnimation Optional

A Boolean indicating whether the initial track selection should prefer an animated track.

The following example creates a new ImageDecoder with the required options.

let init = {
  type: "image/png",
  data: imageByteStream
};

let imageDecoder = new ImageDecoder(init);