664375 - Zooming out makes the given image vanish

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Laxminarayan G Kamath A]

User-Agent:       Mozilla/5.0 (X11; Linux i686; rv:7.0a1) Gecko/20110613 Firefox/7.0a1
Build Identifier: Mozilla/5.0 (X11; Linux i686; rv:7.0a1) Gecko/20110613 Firefox/7.0a1

I was just curiously trying to replicate the bug 468496 and confirm if on a recent nightly it is fixed, (which it indeed was). I lazily just played around, and ended up zooming out enough to notice that the image comlpetely vanished on zooming out a few times (5 times on my machine with keyboard, or 7 times with mouse scrollwheel , your milage may vary) 

Reproducible: Always

Steps to Reproduce:
1. load the image with URL https://bug468496.bugzilla.mozilla.org/attachment.cgi?id=351955
2. keep zooming out till you notice that the image vanishes or you reach the zoomout max limit, whichever comes first


Actual Results:  
Most likely on a Linux machine, you will notice that the image has completely vanished. 

Expected Results:  
There should have been some hint of green left. 

Graphics

Adapter Description:
   Tungsten Graphics, Inc -- Mesa DRI Intel(R) 915G GEM 20100330 DEVELOPMENT x86/MMX/SSE2Driver Version1.4 Mesa 7.9-devel
WebGL Renderer: 
   Brian Paul -- Mesa OffScreen -- 2.1 Mesa 7.9-devel
GPU Accelerated Windows: 
   0/1. Blocked for your graphics driver version. Try updating your graphics driver to version Mesa 7.10 or newer.


Cairo Libs on system:

gtk2-engines-murrine    0.98.1.1-0ubuntu1
libcairo2               1.10.0-1ubuntu2 
libcairomm-1.0-1        1.8.4-3
libpixman-1-0           0.18.4-1

Xorg: 
xserver-xorg-video-intel  2:2.12.0-1ubuntu5.2
xorg                      1:7.5+6ubuntu3 
xserver-xorg-core         2:1.9.0-0ubuntu7.3

Comment 1

[George Carstoiu]

Mozilla/5.0 (X11; Linux i686; rv:7.0a1) Gecko/20110615 Firefox/7.0a1

I can confirm the issue you have logged. Setting status to New. Can you please check and see since when is this happening? 

http://quality.mozilla.org/docs/bugzilla/guide-to-triaging-bugs-for-firefox/finding-a-regression-window/

Comment 2

[Laxminarayan G Kamath A]

I just confirmed something similar with my  Firefox 3.5.15 . When I zoomed out so many times on 3.5.15, I could see only the black blobs referred to in bug 468496

Comment 3

[Alice0775 White]

Not reproduced:
http://hg.mozilla.org/mozilla-central/rev/fbae114d6133
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1b2pre) Gecko/20081104 Shiretoko/3.1b2pre ID:20081104040308
Reproduced:
http://hg.mozilla.org/mozilla-central/rev/dcec193ba5d7
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1b2pre) Gecko/20081105 Shiretoko/3.1b2pre ID:20081105032350
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=fbae114d6133&tochange=dcec193ba5d7

Comment 4

[Timothy Nikkel (:tnikkel)]

Probably http://hg.mozilla.org/mozilla-central/rev/49dd935efff3 bug 458487.

Comment 5

[Laxminarayan G Kamath A]

Alice: Could this be a linux specific bug?

Comment 6

[Alice0775 White]

(In reply to comment #4)
> Probably http://hg.mozilla.org/mozilla-central/rev/49dd935efff3 bug 458487.

In local build(windows7):
build from: e16da35c4223: Reproduced the issue
build from: backed out 49dd935efff3 from e16da35c4223: cannot reproduce
build from: 668acba0c402: cannot reproduce
Triggered by:
49dd935efff3	Robert O'Callahan — Bug 458487 - 'Rework image snapping logic'. r=vlad+joedrew, sr=dbaron

(In reply to comment #5)
> Alice: Could this be a linux specific bug?

I think this bug is all platform.

Comment 7

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

Attachment: testcase

It seems to be some kind of graphics bug to do with image downasmpling.

This canvas-only testcase draws just a gray band across the top, but I'm pretty sure the green pixel should contribute so the green channel of that band is greater than the other channels. Yet, no browsers I've tested this on do so.

Comment 8

[Abe - QA (:Abe_LV)]

Not reproducible in windows-10 and Ubuntu 14.04 with latest Nightly.
Considering this, I will mark this issue as Resolved-WORKSFORME. If anyone can still reproduce it, feel free to reopen the issue and provide more information. Thanks

----
Version 	49.0a1
Build ID 	20160519030232
Update Channel 	nightly
User Agent 	Mozilla/5.0 (X11; Linux i686; rv:49.0) Gecko/20100101 Firefox/49.0