- From: Philip Taylor <excors+whatwg@gmail.com>
- Date: Mon, 30 Nov 2009 18:31:53 +0000
On Mon, Nov 30, 2009 at 4:46 PM, Kenneth Russell <kbr at google.com> wrote: > CanvasPixelArray specifies that values greater than 255, including > +inf, are clamped to 255 and values less than 0, including -inf, are > clamped to zero. WebGLUnsignedByteArray (as people will see in the > WebGL draft spec this week or next) specifies that the conversion is > done with a C-style cast. The results are different for out-of-range > values. I was going to say: It doesn't include +/-inf, because http://whatwg.org/html5#dependencies says "if a method with an argument that is a floating point number type (float) is passed an Infinity or Not-a-Number (NaN) value, a NOT_SUPPORTED_ERR exception must be raised", and that probably applies to the CanvasPixelArray setter method. But it looks like the spec changed since I last looked, and the setter takes an 'octet' argument, so I think the conversion should happen as per http://dev.w3.org/2006/webapi/WebIDL/#es-octet and CanvasPixelArray shouldn't define any conversion. (Filed as http://www.w3.org/Bugs/Public/show_bug.cgi?id=8405). Hopefully WebIDL and WebGL either match or can be made to match. -- Philip Taylor excors at gmail.com
Received on Monday, 30 November 2009 10:31:53 UTC