673071 - Canvas drawImage is broken when applying shadows in Firefox5

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Jens Mönig]

Attachment: open this in Firefox5 to see the bug - compare it to Safari, IE or Opera

User Agent: Mozilla/5.0 (Windows NT 6.0; rv:5.0) Gecko/20100101 Firefox/5.0
Build ID: 20110615151330

Steps to reproduce:

draw a shape onto an offscreen canvas, then draw the offscreen canvas to an on-screen one using drawImage *and* shadowing. 


Actual results:

Up until v.4 this used to work, now in v.5 instead of applying the shadow Firefox also /fills/ the blitted area.


Expected results:

I'm attaching two screenshots of the expected outcome and how it appears in Firefox5, and a commented html file which reproduces the bug

Comment 1

[Jens Mönig]

Attachment: screenshot of what I'm seeing in Firefox5

Comment 2

[Jens Mönig]

Attachment: screenshot of what I'm expecting (taken from Safari)

Comment 3

[Jens Mönig]

this is a blocker for the http://byob.berkeley.edu visual programming language project

Comment 4

[AndreiD[QA]]

(In reply to comment #1)
> Created attachment 547351 [details]
> screenshot of what I'm seeing in Firefox5

I get the same result as the one in the attachment on the latest Firefox Nightly (Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0a1) Gecko/20110720 Firefox/8.0a1)
Thus, the same image is displayed on IE9.

When I load the canvas example in Chrome I get a different result from all the others. So it's unclear which is the expected result.

Comment 5

[Jens Mönig]

I also filed a bug report for Chrome:
http://code.google.com/p/chromium/issues/detail?id=90001

Comment 6

[Jens Mönig]

Did you say IE9 displays the same result as Firefox5?

IE9, Safari and Opera all render the example the same for me according to my expectations.

Comment 7

[AndreiD[QA]]

(In reply to comment #6)
> Did you say IE9 displays the same result as Firefox5?

I am using a Firefox 6 Beta build; the result displayed on this build is correct.
Please check to see if you can reproduce the issue on Fx Beta:
http://www.mozilla.com/en-US/firefox/channel/

If the issue is not reproducible on Beta it means it will be fixed in FX6 (launch is on the 16 August, I believe).

Comment 8

[Jens Mönig]

You're right, on Beta6 the issue appears to be resolved nicely. Awesome, thanks a lot for you help!

Comment 9

[AndreiD[QA]]

(In reply to comment #8)
> You're right, on Beta6 the issue appears to be resolved nicely. Awesome,
> thanks a lot for you help!

You're welcome. So, looking forward for the FX6 launch. 
Setting this as resolved.