489304 - canvas.toDataURL must return image/png on unsupported types

Status: RESOLVED DUPLICATE of bug 401788

(Core :: Graphics: Canvas2D, defect)

Description

[Klaus Förster]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8

according to section 4.8.11 of the canvas specification canvas.toDataURL must return image/png on usupported types:

http://www.whatwg.org/specs/web-apps/current-work/#dom-canvas-todataurl

"Only support for image/png is required. User agents may support other types. If the user agent does not support the requested type, it must return the image using the PNG format"


Reproducible: Always

Steps to Reproduce:
1. open test at http://svg.cc/posts/canvas_toDataURL.html
2. Test should say "passed" and display base64 encoded image/png string

Actual Results:  
ctx.canvas.toDataURL('type/unsupported') failed:
[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMHTMLCanvasElement.toDataURL]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: http://svg.cc/posts/canvas_toDataURL.html :: anonymous :: line 10" data: no]

Expected Results:  
ctx.canvas.toDataURL('type/unsupported') passed:
data:image/png;base64,....

Comment 1

[Tyler Downer [He/Him]]

This is a mass search for bugs which are in the Firefox General component, are
UNCO, have not been changed for 500 days and have an unspecified version. 

Reporter, can you please update to Firefox 3.6.10 or later, create a fresh profile, http://support.mozilla.com/en-US/kb/managing+profiles, and test again. If you still see the issue, please update this bug. If the issue is gone, please set the status to RESOLVED > WORKSFORME.

Comment 2

[Klaus Förster]

Firefox 3.6.11 on Ubuntu still has the same behaviour as described in the initial bug-report

Comment 3

[Nickolay_Ponomarev]

the testcase works for me with Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5; rv:2.0b8pre) Gecko/20101106 Firefox/4.0b8pre, please confirm with a nightly build http://nightly.mozilla.org/

Comment 4

[Boris Zbarsky [:bzbarsky]]

Yeah, this has been fixed since July or so.