637077 - missing ImageData interface makes WebGL conformance test fail

Status: RESOLVED DUPLICATE of bug 550309

(Core :: Graphics: Canvas2D, defect)

Description

[Benoit Jacob [:bjacob] (mostly away)]

getImageData() and putImageData() are implemented by duck-typing; the ImageData interface is missing. This is preventing me from passing this WebGL test,

https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/tests/conformance/more/conformance/quickCheckAPI.html

as it fails on this code (quickCheckAPI.js line 1050):

   ximage instanceof ImageData

with the exception 'ImageData is not defined'.

If you think that this conformance test is wrong, I'd be interested in your opinion (I don't really know myself if the spec's interface names such as ImageData are normative).

Comment 1

[Benoit Jacob [:bjacob] (mostly away)]

Also, in WebGL, certain functions such as texImage2D are overloaded and the overload resolution requires differentiating between ImageData and HTML elements such as 'img', 'canvas', 'video'.

Currently we have to resort to very clumsy code, basically trying to interprete the passed object as a HTML element first, and if that fails then try to interprete it as a duck-typed ImageData.

Having a proper ImageData type would presumably allow to do that in a cleaner way.

Comment 2

[Boris Zbarsky [:bzbarsky]]

The interface thing is normative, but postdates our implementation.  It's also been somewhat controversial; I'm not sure what the current thinking is on keeping it in the spec.

Comment 3

[Boris Zbarsky [:bzbarsky]]

And it's also not obvious whether it should be [NoInterfaceObject] or not, of course.  It's not in the spec right now, but that could be oversight.

Comment 4

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

This has long been fixed, no?