863618 - getBoundingClientRect on range with scaled (transformed) element returns wrong offsets

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Andrey]

Attachment: test.html

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130329030352

Steps to reproduce:

I created a div with:
transform: matrix(2, 0, 0, 2, 0, 0);
transform-origin: 0 100%;

And some text in it. Selected a part of text with Range and called getBoundingClientRect. (See file attached)


Actual results:

It returns wrong ClientRect. As if transform wouldn't be applied.


Expected results:

getBoundingClientRect should return the correct ClientRect that counts transform.

Comment 1

[Timothy Nikkel (:tnikkel)]

Looks like nsRange needs some RECTS_ACCOUNT_FOR_TRANSFORMS for it's GetAllInFlowRects calls, but it's not that simple as there is some custom code for when the range only includes part of a text frame. Those could probably be handled by using TransformFrameRectToAncestor.

Comment 4

[François REMY]

Attachment: reduced-testcase.html

Added a test case. The issue also applies to all kinds of transforms.

Comment 5

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

Attachment: Make Range.getClientRects/getBoundingClientRect take account of CSS transforms

Comment 6

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

https://hg.mozilla.org/integration/mozilla-inbound/rev/53d464f0f4cd

Comment 7

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/53d464f0f4cd