1391389 - Large GIF opens as empty grey box only

Status: NEW

(Core :: Graphics: ImageLib, defect, P3)

Description

[RobH]

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0
Build ID: 20170814072924

Steps to reproduce:

This is the image link at present:
https://pdmhs.co.uk/files/images/Pretoria_sheet_3_find_numbers.gif
Filesize about 450K, image dimensions 9368x13249



Actual results:

grey box which I can then zoom and scroll but detail never emerges.  The image is pure B&W.  Same with all plugins disabled and on a different PC.

Using Win10 v1703, FF vsn55.0.2 (32 bit) - second PC Win 10 Pro


Expected results:

Same as in other browsers (Chrome, Edge, MSIE11, Opera) in those the image opens OK scaled to screen size but can then zoom & scroll

Comment 1

[Andrew Osmond [:aosmond] (he/him)]

I can reproduce on Linux. Grey sounds like it allocated a frame but failed to decode any data.

Comment 2

[Andrew Osmond [:aosmond] (he/him)]

(In reply to Andrew Osmond [:aosmond] (PTO 08/19-08/28) from comment #1)
> I can reproduce on Linux. Grey sounds like it allocated a frame but failed
> to decode any data.

Hmmm, it is actually too big to be inserted into the cache. 9368x13249 is 473MB for the first frame and 118MB for subsequent/paletted frames. We estimate the cost to be 3 frames * 473MB = 1.39GB, which exceeds the cache size of 1GB. We do have a bug open to increase the maximum cache size, but it does beg the question on what to do with far more content processes. We limit images to use 1/4 of the memory (up to 1GB) but if we have 2+ content processes (+ the parent process) we could permit more memory dedicated to image buffers than we had planned for.

Comment 3

[RobH]

Thanks for taking a look. 
I've persuaded my user maybe it's a dumb thing to want to do and better to use <a href="./images/Pretoria_sheet_3_find_numbers.gif" download> download sheet 3</a> and view the downloaded image in some software more suited to messing with images.

Comment 4

[Milan Sreckovic [:milan] (needinfo for best results)]

Pretty sure this never worked, with this kind of animated image size...