931717 - CSS Transformation (e.g. scale(1,1)) disables rendering of java-applet

Status: RESOLVED INVALID

(Core :: Layout, defect, P5)

Description

[mails4andy]

Attachment: applet-test.zip

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0 (Beta/Release)
Build ID: 20130328110703

Steps to reproduce:

The attached testcase contains a simple page with a java-applet on it. The java-applet
ist just rendering a blue background.
When the body-element has a CSS Transformation, e.g. "transform: scale(1,1)", 
then the applet is not rendering anymore.

Tested with:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0 Build: 20131023004005
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0

Java: Java(TM) Platform SE 6 U51 File: npjp2.dll Version: 6.0.510.30


Actual results:

Applet is not rendering. Screen remains white.


Expected results:

Applet is rendering. In this testcase there should be a blue background.

Comment 1

[Loic]

Regression range:
good=2012-07-01
bad=2012-07-02
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d9d61d199b11&tochange=a31fc9052840

Suspected bug:
Ms2ger — Bug 745523 - Part b: Unprefix transforms; r=dbaron This patch introduces unprefixed 'transform', 'transform-origin', 'perspective', 'perspective-origin', 'transform-style' and 'backface-visibility' properties, and updates the mochitests in layout/style to use them.

I guess there is probably another underlying bug with transform.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Windowed plugins are not rendered inside transformed content, because there is no way to transform windowed stuff.  Is this applet running in windowless mode or windowed mode?

Comment 3

[mails4andy]

I don't know how to find out if the java plugin uses windowless or windowed mode.

I also tried a newer version of the java plugin (Java(TM) Platform SE 7 U45 Version: 10.45.2.18) without success.

In Chrome with "-webkit-tranform: scale(1,1)" the applet is rendering.

Comment 4

[mails4andy]

(In reply to mails4andy from comment #3)
> In Chrome with "-webkit-tranform: scale(1,1)" the applet is rendering.

Typo: -webkit-transform: scale(1,1);

Comment 5

[Boris Zbarsky [:bzbarsky]]

What happens in Chrome is, iirc, that some transforms cause non-rendering (non-trivial ones) but others do not.  What does "-webkit-tranform: scale(2,2)" do?

Comment 6

[mails4andy]

(In reply to Boris Zbarsky [:bz] from comment #5)
> What happens in Chrome is, iirc, that some transforms cause non-rendering
> (non-trivial ones) but others do not.  

I think it would be ok, if only trivial transforms are supported. Maybe rendering untransformed for the non-trivial ones ist in option?

> What does "-webkit-tranform: scale(2,2)" do?

I will upload two screenshots of Chrome with "scale(0.7,0.7)" and "scale(2,2)" using the same testcase.

Comment 7

[mails4andy]

Attachment: chrome-transform-scale-2-2.png

Comment 8

[mails4andy]

Attachment: chrome-transform-scale-07-07.png

Comment 9

[Mats Palmgren (inactive)]

Does it work if you add <param name="wmode" value="opaque">
or <param name="wmode" value="transparent">

Comment 10

[Robert O'Callahan (:roc) (email my personal email if necessary)]

We could support scale+translate transforms of windowed plugins by scaling the window size, but it would be complicated and probably not worth doing.

Comment 11

[mails4andy]

(In reply to Mats Palmgren (:mats) from comment #9)
> Does it work if you add <param name="wmode" value="opaque">
> or <param name="wmode" value="transparent">

Both parameters does not make any difference.

Comment 12

[Kyle Machulis [:qdot] [:kmachulis] (INACTIVE)]

The HTML <applet> element and related java functionality was removed from Gecko in Bug 1279218. Marking related bugs as invalid.