Layers for Canvas

[Juanmihd]

A javascript interface for using layers within canvas.

Provide a beginLayer() and endLayer() functions that create and close layers for Canvas. These methods provide an alternative method for applying a filter, shadow or compositing to a set of drawn operations (as opposed to a single one), other than having to create a temporary canvas and then draw the temporary canvas into the intended canvas.

Working proposal: https://github.com/fserb/canvas2D/blob/master/spec/layers.md
Whatwg issue: #7329

• At least two implementers are interested (and none opposed):
  • …
  • …
• Tests are written and can be reviewed and commented upon at:
  • https://github.com/web-platform-tests/wpt/tree/master/html/canvas/element/manual/layers
• Implementation bugs are filed:
  • Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=1217724
  • Firefox: …
  • Safari: …
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): …
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): …

(See WHATWG Working Mode: Changes for more details.)

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/canvas.html ( diff )
/index.html ( diff )

[annevk]

Let's resolve the discussion first and then get back to this.