382189 - Canvas behaves poorly with some transformations

Status: VERIFIED WORKSFORME

(Core :: Graphics: Canvas2D, defect, P2)

Description

[Chris Thomas (CTho) [formerly [e-mail] [e-mail]]]

Attachment: testcase

This non-reduced testcase eventually results in Firefox (2.0.0.3) / SeaMonkey (Gecko 1.8.1.2pre) eating up huge amounts of memory.  I suspect the cause is the ctx.scale() and/or ctx.translate() which are done repeatedly with no ctx.restore() between iterations.  Uncommenting ctx.restore() on line 158 makes the issue go away.

<biesi> your wormhole2 thing basically made X unusable
<biesi> I killed seamonkey from a console
<Hendikins> CTho: I had to do the same on here.

Steps to reproduce:
1. Open the testcase, let it run for a while (I'm guessing the scale/translate have to accumulate).

A reduced testcase might be as simple as one or two ridiculously large scale/translate calls with some drawing.

Comment 1

[Joe Drew (not getting mail)]

Still occurs on trunk on Mac.

Comment 2

[Bas Schouten (:bas.schouten)]

There's nothing in the current canvas code that would cause eating of additional memory on lots of subsequent transforms as far as I can see.

I also cannot reproduce this issue in Nightly or Release. -> WFM

Please re-open if somebody is still seeing this.

Comment 3

[Chris Thomas (CTho) [formerly [e-mail] [e-mail]]]

Works for me on 7.0 on Windows and 6.0.1 on Linux.  Marking verified.