ImageDecoder.ImageDecoder()

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

Syntax

new ImageDecoder(init);

Parameters

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.

premultiplyAlphaOptional

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

• "none"
• "premultiply"
• "default"

colorSpaceConversionOptional

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

• "none"
• "default"

desiredWidthOptional

An integer indicating the desired width for the decoded output.

desiredHeightOptional

An integer indicating the desired height for the decoded output.

preferAnimationOptional

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

Examples

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

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

let imageDecoder = new ImageDecoder(init);

Specifications

Browser compatibility