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[Fwd: SVGt 1.2 Tests: Rationale of fonts-elem-05-t]

From: Anthony Grasso <anthony.grasso@cisra.canon.com.au>
Date: Tue, 24 Jun 2008 21:41:24 +1000
Message-ID: <4860DD64.7050000@cisra.canon.com.au>
To: W3C SVG Public Working Group <public-svg-wg@w3.org>

Hi WG,

As per my action ACTION-1928 [1] I've investigated the comments made by 
Kalle on fonts-elem-05-t [2]. Here are my findings.

What Kalle said about text advancement in his email is correct.

Regarding the test it appeared to be testing horiz-origin-x attribute of 
the font element. I've made fixes to the test as it was not clear what 
was a pass or fail. The text "horiz-adv-x=1000 but ignored" was bogus 
and changed to "horiz-origin-x=1000". I've added a clear description to 
the test and set its status back to "created". Additionally I've created 
a new reference image for it.

If we have time can we review the test please so I can make any further 
changes if need be.

This closes my action.

Thanks,

Anthony


[1] http://www.w3.org/Graphics/SVG/Group/track/actions/1928
[2] http://lists.w3.org/Archives/Public/www-svg/2008Mar/0080.html

-------- Original Message --------
Subject: SVGt 1.2 Tests: Rationale of fonts-elem-05-t
Resent-Date: Wed, 19 Mar 2008 13:37:01 +0000
Resent-From: www-svg@w3.org
Date: Wed, 19 Mar 2008 14:33:40 +0100
From: Kalle Raita <kraita@nvidia.com>
To: <www-svg@w3.org>


Hi All,

Could someone explain the rationale behind the test
fonts-elem-05-t, please. The test sets different values
for horiz-origin-x of font. As far as I see, this the
only difference between the three rows in the test.

According to the spec the horiz-origin-x coordinate in
the glyph space should be aligned with the current text
position. If the x coordinate of the origin is increased,
I'd expect the glyphs move left in the rendered results as
the origin moves right in the glyph space. I'm assuming two
things: 1) The x coordinate increases to right and 2) the
horiz-origin-x is not added to the coordinates provided in
the glyps.
(See E.g. http://www.w3.org/TR/SVGMobile12/text.html#CurrentTextPosition
and
  http://www.w3.org/TR/SVGMobile12/fonts.html#FontElement)

The weird part is that the reference image shows no change between
the rows and the checking aids hint that the writer of the test
expects the glyphs move right. Also, the last line has
explanation "horiz-adv-x=1000 but ignored", which makes
absolutely no sense to me.

Any and all insights appreciated.

Yours,
   - Kalle Raita


Kalle Raita
NVIDIA Corporation
Tel. +358 40 723 1441
kraita@nvidia.com
http://eu.nvidia.com <http://eu.nvidia.com/>

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Received on Tuesday, 24 June 2008 11:42:06 GMT

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