[whatwg] Clipping text in in canvas

Jasper St. Pierre jstpierre at mecheye.net
Sun Sep 15 09:09:08 PDT 2013

On Sun, Sep 15, 2013 at 12:04 PM, David Dailey <ddailey at zoominternet.net>wrote:

> Last I checked applying a clipPath to text in SVG works consistently across
> browsers, and there it remains accessible: to screen readers, indexing,
> searching, drag-to-select, etc. Why would one want a bunch of pixels that
> resemble text?
> Just saying,
> David

I have an insane, complex use case, and you'd laugh at me if I told you
what it was, but trust me when I say I need an immediate mode drawing API
like <canvas> instead of a retained scene graph like SVG.

-----Original Message-----
> From: whatwg-bounces at lists.whatwg.org
> [mailto:whatwg-bounces at lists.whatwg.org] On Behalf Of Jasper St. Pierre
> Sent: Sunday, September 15, 2013 11:38 AM
> To: whatwg at whatwg.org
> Subject: [whatwg] Clipping text in in canvas
> The canvas specification maintains:
>     These shapes are painted without affecting the current path, and are
> subject to shadow effects, global alpha, the clipping region, and global
> composition operators. [0]
> But no browsers I tested actually implement the "clipping region" part.
> Should this be removed for backwards compatibility reasons? Should we
> introduce a new method of clipping text be introduced, or should we just
> require users who want to draw clipped text to draw to a scratch canvas and
> use drawImage to copy the pixels?
> [0]
> http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-eleme
> nt.html#drawing-text-to-the-bitmap
> --
>   Jasper


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