790468 - context.drawImage() on canvas.toDataURL("image/png") should be idempotent

Status: UNCONFIRMED

Description

[christoph.burgmer]

Created attachment 660253 [details]
firefoxTransparencyBug.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1

Steps to reproduce:

I loaded a transparent image into a canvas. I then got the content as an "image/png" dataURL and rendered that to another canvas.

See attached test case (alternatively https://gist.github.com/3703025).


Actual results:

The canvasses do not have the same content.


Expected results:

The canvasses should both be equal in terms of ImageData and resulting dataURL.