455308 - bad joint between images of border-image when using transform:rotate

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Laurent Jouanneau]

Attachment: screenshot which shows the issue

A dotted white line appears between each parts of the border when this border is drawn by border-image and when we rotate the element with the "transform" property.

Comment 1

[Laurent Jouanneau]

Attachment: HTML page for the test

Comment 2

[Laurent Jouanneau]

Attachment: image used by the html page to draw the border

Comment 3

[Laurent Jouanneau]

You can see also the test web page directly at the given URL...

Comment 4

[Martijn Wargers (dead)]

Attachment: testcase that used data url.

Comment 5

[Clochix]

According to my tests, it's not related to the "transform" property: the same border is drawn without transform, by just increasing border-width. It seems to affect both repeat and round border type but not stretch (I'm using the latest linux x86_64 nightly build)

Comment 6

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Could you file a separate bug about that?  I think this is probably a duplicate of the generic bug about seams when things are transformed as a result of how we do anti-aliasing.

Comment 7

[Clochix]

@David: ok, bug created : 455398

Comment 8

[Thomas Goldstein]

Confirmed on Windows with the latest nightly. Just to clear up the fact it's not Linux only...

Comment 9

[Thomas Goldstein]

Oh, and selecting the "New!" text makes it move around.
Is this a known problem, or should I file it?

Comment 10

[Aleks Totic]

This bug happens even without transforms for particular combinations of top/left/width/height. I've seen it with particular fractional values of TLWH. I'll attach a testcase.

Webkit has the same bug on transforms, but not without. 

#516793, #455398 look like dups.

Comment 11

[Aleks Totic]

Attachment: Demonstrates border-image gap bug with and without transform.

Comment 12

[Gregory Pappas [:gregp]]

Aleks, are you still seeing a border-image gap in the comment 11 test case?

Comment 13

[Aleks Totic]

I am not seeing the gap in comment 11, looks great.

Comment 14

[Gregory Pappas [:gregp]]

Happy to hear that!