On Sat, 03 Apr 2010 17:23:39 +0300, Greg Brown <gkbr...@mac.com> wrote:
OK, that makes sense. Thanks for the info.
However, a extra readonly attribute float "height" to the "TextMetrics"
interface should be fairly trivial to implement for browser vendors and
would greatly help web developers layout text in Canvas.
On Apr 2, 2010, at 5:39 PM, Ian Hickson wrote:
On Fri, 2 Apr 2010, Greg Brown wrote:
In reviewing the current draft API for the <canvas> element
(http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html),
I noticed that there is no support for obtaining font metrics such as
ascent, descent, leading, and bounding box. It seems like the most
recent discussion regarding font metrics took place a couple of years
ago:
http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2008-May/014706.html
But even that thread refers to discussions from 2006.
I would personally like to see support for these values added to the
API. Is this something that could be considered for the final spec?
What
are the major obstacles to providing such support? I would think that
this information could be easily obtained using the underlying graphics
API, but maybe I am missing something.
It's something we'll probably add in due course, but for now we're
waiting
for the existing canvas API stuff to be implemented properly. We can't
add
too much stuff at once, because if we do the browser vendors get so far
behind that they end up either rushing to catch up (leading to more
bugs),
or skipping parts in order to get the rest done right (leading to parts
of
the spec being ignored).
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
--
Mathieu 'p01' Henri \ Opera Software
JavaScript Developer \ Core ExtApps
