DOMMatrix setTransform/getTransform on OffscreenCanvas

Category: Graphics
Type: New or changed feature
Status: Enabled by default (Chrome 80)
Intent stage: Start prototyping

Summary

Adds setTransform(DOMMatrix2DInit) and getTransform() to OffscreenCanvasRenderingContext2D.

Motivation

This feature exists and is supported currently for CanvasRenderingContext2D. The WHATWG spec states that OffscreenCanvasRenderingContext2D implements all canvas transform methods, and this is one of the canvas transform methods listed there. Without it it is impossible for a web developer to get the current value of a canvas' transform if it is offscreen.

Standards & signals

Specification: https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-gettransform
Firefox: In development
Safari: No signal
Web developers: No signals
Tracking bug: https://crbug.com/1016454

Docs: N/A

Explainers: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/HT7REXjYLUM

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