PhantomJS does not support Float64Array

[chadaustin]

c...@imvu.com commented:

Here's the concept:

I want to write unit tests for C++ compiled to JavaScript with Emscripten. Emscripten uses typed arrays to implement the C heap, including Float64Array for doubles. We use CasperJS for testing, but its underlying PhantomJS does not support Float64Array. This is because PhantomJS is based on QtWebKit, which does not track the latest WebKit. I'm filing the bug with PhantomJS because not being able to run Emscriptened code in PhantomJS is a major limitation. I will also try to get in touch with the QtWebKit folks.

Which version of PhantomJS are you using? Tip: run 'phantomjs --version'.

1.6.0 (development). I built from source on June 19, 2012.

What steps will reproduce the problem?

1. bin/phantomjs
2. Type Float32Array
3. Type Float64Array

What is the expected output? What do you see instead?

caustin-mbp:~/imvu/phantomjs
$ bin/phantomjs
phantomjs> Float32Array
{
"prototype": {
"subarray": "[Function]",
"BYTES_PER_ELEMENT": 4,
"set": "[Function]"
},
"BYTES_PER_ELEMENT": 4
}
phantomjs> Float64Array
Can't find variable: Float64Array
phantomjs>

Which operating system are you using?

• Tested on OS X and Windows.

Did you use binary PhantomJS or did you compile it from source?

• Compiled from source.

Please provide any additional information below.

WebKit (and all major browsers) support Float64Array but QtWebKit does not track recent versions of WebKit.

Disclaimer:
This issue was migrated on 2013-03-15 from the project's former issue tracker on Google Code, Issue #607.
🌟   4 people had starred this issue at the time of migration.

[ysangkok]

ysang...@gmail.com commented:

How come http://trac.webkit.org/wiki/QtWebKitFeatures22 claims Typed Array support?

[chadaustin]

caustin@gmail.com commented:

It supports most typed array types, just not Float64Array. My colleague is working on upgrading PhantomJS to a newer Qt/WebKit combination, which would add complete support for Float64Array.

[ysangkok]

ysang...@gmail.com commented:

I think this depends on http://code.google.com/p/phantomjs/issues/detail?id=31

[solmsted]

Steven....@gmail.com commented:

PhantomJS as of version 1.7.0 also does not support Uint8ClampedArray.

[agladysh]

So... any updates on this?

[JamesMGreene]

The plan is that PhantomJS 2.0 will use Chromium under the covers instead of WebKit, which will likely resolve more than 50% of our open bugs in one fell swoop. 😉

[agladysh]

Cool! Any ETA on that?

[JamesMGreene]

Not exactly... and apparently we might not jump to Chromium quite yet after all due to timelines vs. its stability on the Qt platform. However, we will still upgrade the WebKit version which is still likely to resolve many, many issues.

See: https://groups.google.com/d/topic/phantomjs/EiXb4iRU7WA/discussion

[ariya]

In the current unstable master branch (see #10448 and #10031), Float64Array is now supported.