- From: <bugzilla@jessica.w3.org>
- Date: Mon, 05 Mar 2012 05:30:10 +0000
- To: public-html-bugzilla@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=14326
Qiankun Miao <qkmiao@gmail.com> changed:
What |Removed |Added
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CC| |qkmiao@gmail.com
--- Comment #2 from Qiankun Miao <qkmiao@gmail.com> 2012-03-05 05:30:09 UTC ---
As defined in latest spec (Editor's Draft 29 February 2012) at
http://dev.w3.org/html5/2dcontext/#imagedata, the data of imagedata is
initialized to a Uint8ClampedArray object which maps to a octet type in Web
IDL.
According to the mapping rule defined at
http://dev.w3.org/2006/webapi/WebIDL/#es-octet, an attribute annotated with the
[Clamp] extended attribute should handle as follows:
1. Round x to the nearest integer, choosing the even integer if it lies halfway
between two.
2. Set x to min(max(x, 0), 2^8 − 1).
3. Return the IDL octet value that represents the same numeric value as x.
e.g.
0.499 -> 0
0.5 -> 0
0.501 -> 1
1.499 -> 1
1.5 -> 2
1.501 -> 2
2.5 -> 2
3.5 -> 4
252.5 -> 252
253.5 -> 254
254.5 -> 254
256.5 -> 255
-0.5 -> 0
-1.5 -> 0
So this test should be updated.
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Received on Monday, 5 March 2012 05:30:12 UTC