859231 - Enable high-quality image scaler in every case.

Status: RESOLVED DUPLICATE of bug 795072

(Core :: Graphics: ImageLib, defect)

Description

[blind_box2]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:23.0) Gecko/20130407 Firefox/23.0
Build ID: 20130407030841

Steps to reproduce:

I visited this site.

https://bug486918.bugzilla.mozilla.org/attachment.cgi?id=657754


Actual results:

The high-quality image scaler is not working.


Expected results:

The scaler should have worked. Right click > view image > zoom out by itself works.

Comment 1

[blind_box2]

Attachment: image scaling working with one image

I did a few more testing and realized this bug might be related to https://bugzilla.mozilla.org/show_bug.cgi?id=795072 .

Having only a single picture to downscale, as shown in this attachment, makes the HQ scaler work. Having two pictures in an HTML for downscaling, makes the HQ scaler fail.

Comment 2

[blind_box2]

Attachment: image scaling not working with two images

Comment 3

[silverwind]

Note sure if this is the correct bug, but let me add another example:

GOOD: https://github.com/joyent/node/commits/master
BAD: https://github.com/silverwind/Droppy/commits

Github uses downscaled avatar images here, and it seems that if one image appears a certain amount of times, the downscaler doesn't kick in at all for it. In case node's commit log doesnt show smooth downscaling, view any other commit log with many different authors.

Comment 4

[Elbart]

In the link here https://bugzilla.mozilla.org/show_bug.cgi?id=486918#c289 (beware, excessive memory-usage!)
some images are scaled, some are not.
So just having more than one image doesn't break the scaling.