1140796 - Cannot set content ImageData from an array created in browser/chrome scope - Error: Permission denied to access property "length"

Status: RESOLVED INVALID

(Core :: General, defect)

Description

[noitidart]

Attachment: set ArrayBuffer with arr data.js

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0
Build ID: 20150302192546

Steps to reproduce:

Copy paste the attached code to Scratchpad.
Run it in Environment>Content scope

it works, scroll down to the current focused tab and you'll see a firefox icon drawn 16x16px (its partial firefox icon)

Change Environment>Browser run it, now get 

Now change scope to 


Actual results:


/*
Exception: Error: Permission denied to access property "length"
@Scratchpad/9:31
*/

Comment 1

[Nickolay_Ponomarev]

I think this is expected, since you're passing a chrome array to a content method:

    var doc = gBrowser.contentDocument;
    var canvas = doc.createElement('canvas');
    doc.body.appendChild(canvas);

    var ctx = canvas.getContext('2d');
    var idata = ctx.createImageData(16, 16);
    var normalArr = [];
    ...
    idata.data.set(normalArr);


If you define the array as:
    var normalArr = new doc.defaultView.Array();
- it will work (until e10s lands).

Comment 2

[noitidart]

thanks for those notes nickolay! ya it makes sense, i just wish there was someway to use canvas without needing a document. especially using canvas in a ChromeWorker

Comment 3

[Simona Badau, Desktop Test Engineering]

Based on the last 2 comments I'm setting the status of this issue to Resolved Invalid.

Comment 4

[Firefox Bug Husbandry Bot]

Moving from Core::Untriaged to Core::General https://bugzilla.mozilla.org/show_bug.cgi?id=1407598