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Re: [whatwg] Clipping text in in canvas

From: David Dailey <ddailey@zoominternet.net>
Date: Sun, 15 Sep 2013 12:19:25 -0400
To: "'Jasper St. Pierre'" <jstpierre@mecheye.net>
Message-ID: <000a01ceb22f$58516760$08f43620$@net>
Cc: whatwg@whatwg.org
I'm sure there are such uses and I'm assured that you have one. I was just
sending out my canned reminder that alternatives to canvas exist (many folks
seemed not to know that, only a few years ago).

 

Cheers and regards

D

 

From: magcius@gmail.com [mailto:magcius@gmail.com] On Behalf Of Jasper St.
Pierre
Sent: Sunday, September 15, 2013 12:09 PM
To: David Dailey
Cc: whatwg@whatwg.org
Subject: Re: [whatwg] Clipping text in in canvas

 

 

On Sun, Sep 15, 2013 at 12:04 PM, David Dailey <ddailey@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@lists.whatwg.org
[mailto:whatwg-bounces@lists.whatwg.org] On Behalf Of Jasper St. Pierre
Sent: Sunday, September 15, 2013 11:38 AM
To: whatwg@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
<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-elem
ent.html#drawing-text-to-the-bitmap> 
nt.html#drawing-text-to-the-bitmap

--
  Jasper






-- 
  Jasper
Received on Sunday, 15 September 2013 16:19:55 UTC

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