The ImageBitmap rendering context for <offscreenCanvas>

We are adding ImageBitmapRendererContext as a valid context for OffscreenCanvas. ImageBitmapRenderingContext allows direct transfer of an ImageBitmap to the canvas surface. This is particularly important as a way to render an ImageBitmap to a Canvas from a Worker (without transferring the ImageBitmap to the main thread). This is also currently the spec-defined way to render WebGPU content to the screen.

We want to be able to move away from CPU to GPU the operations involving ImageBitmap rendering context. This is also currently the spec-defined way to render WebGPU content to the screen.

Documentation

• https://html.spec.whatwg.org/#the-imagebitmap-rendering-context
• https://html.spec.whatwg.org/#the-offscreencanvas-interface

Specification

Established standard

Status in Chromium

Blink components: Blink>Canvas

Enabled by default (tracking bug) in:

• Chrome for desktop release 76
• Chrome for Android release 76

Consensus & Standardization

• Firefox: In development
• Edge: No public signals
• Safari: In development
• Web Developers: No signals

Owners

• juanmihd@chromium.org
• fserb@chromium.org

Intent to Prototype url

Last updated on 2019-10-09