105851 - no (incorrect) delay in gif animation -- speedy -- when moving cursor around

Status: RESOLVED DUPLICATE of bug 125137

(Core :: Graphics: ImageLib, defect)

Description

[D.F. Sarcosos]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:0.9.5) Gecko/20011011
BuildID:    2001101117

When moving the cursor around in the browser window, the GIF animation lose its
delay. The delay returns to defined (i.e., 0.01s) when you stop moving the
cursor or move it outside mozilla.

The very gif in a HTML-doc:
http://www.w3schools.com/graphics/default.asp

Reproducible: Always
Steps to Reproduce:
1. Open http://www.w3schools.com/images/contents.gif
2. Move cursor around in the browser window for a while.
(May have to click in the window too -- to trigger.)

Actual Results:  gif "goes berserk." (no delay)

Expected Results:  constant 0.01s delay (as defined in GIF)

Don't know what makes this particular gif image special...
this bug has never occur on any other gif i've seen.

Comment 1

[Alex Vincent [:WeirdAl]]

Confirmed.  Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.5+) Gecko/20011019

Comment 2

[Alex Vincent [:WeirdAl]]

Specifically, onfocus or onload of the window, image will go berserk until mouse
stops moving.  Also onmouseout of the image, image will go berserk until mouse
stops moving.

Comment 3

[basic]

seems to me that you don't even need to move the cursor around to get the speedy
animation now... ;-)

tested with build 2002020603 win32 trunk

Comment 4

[ArronM (:paper)]

No problems on Build 2002021203, Win2k

Looks like Mozilla is trying it's darnest to display 12.5 page flips (animation
cycles) per second no matter if I move the mouse, or click on the image insanely. :)

8 frames, each with a 0.01s delay = 0.08s per animation cycle
100 frames @ 0.01s = 1 second = 12.5 animation cycles per second.

Note that IE incorrectly displays about 10 frames per second.  This is most
likely on purpose to prevent insanely fast animations.

Comment 5

[ArronM (:paper)]

This bug was fixed by Bug 125137
Someone please mark it as Resolved.

Comment 6

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 125137 ***