418848 - APNG crops frame portion

Status: RESOLVED WORKSFORME

(Core :: Graphics: ImageLib, defect)

Description

[Helder "Lthere" Magalhães]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4pre) Gecko/2008022104 Minefield/3.0b4pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b4pre) Gecko/2008022104 Minefield/3.0b4pre

Regarding the attached test case image, bottom portion of second frame is cropped.

Shows properly in Opera 9.50 beta (Build 9789).

Reproducible: Always

Steps to Reproduce:
1.Open attachment "apng-crop-image.png"
Actual Results:  
In the second frame, a portion of image at the bottom (screenshot's window frame and status bar) is cropped.

Expected Results:  
Only the window contents are changed between frames.

Source images were produced using Paint .NET release 3.22 (build 3.22.2933.24445).

APNG image was created using online PNG assembler [1]. Used settings:
 * Time to display each frame (milliseconds): 400
 * Don't show the first frame on APNG-aware viewers: [checked]

[1] http://littlesvr.ca/apng/assembler/assembler.php

Comment 1

[Helder "Lthere" Magalhães]

Attachment: APNG image which shows the described symptom

Comment 2

[Helder "Lthere" Magalhães]

Attachment: Source images used in online APNG assembler

Comment 3

[Helder "Lthere" Magalhães]

Same symptom observed in Ubuntu 7.10 environment. Assuming this is not an OS-specific issue and is (potentially) experienced in all supported operating systems.

Linux version of Opera 9.50 Beta 2 (Build 1823) also shows proper behavior - this may allow easier comparison. Forgot to mention that Opera version referred above (in comment 0) was a Windows build.

Version:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b4pre) Gecko/2008022204 Minefield/3.0b4pre

Comment 4

[AndrewM]

Can you still reproduce this in a recent nightly? I can't see anything strange going on at the bottom of the image; the only thing that seems to change between the two frames is the flashing black square.

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9pre) Gecko/2008040404 Firefox/3.0pre ID:2008040404

Comment 5

[Helder "Lthere" Magalhães]

(In reply to comment #4)
> Can you still reproduce this in a recent nightly? I can't see anything strange
> going on at the bottom of the image;
I confirm this also - latest nightly build works as expected. Inclusively, I was able to find the build that fixed the issue (though on Windows only).

> the only thing that seems to change
> between the two frames is the flashing black square.
This is the expected behavior - it's a test case for bug 418901. ;-) Without the blinking square the bug wouldn't show, and maybe this one wouldn't be caught also! :-)

Versions:
Windows, buggy - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008040305 Minefield/3.0pre
Windows, fixed - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008040404 Minefield/3.0pre
Ubuntu, fixed - Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9pre) Gecko/2008040604 Minefield/3.0pre

Comment 6

[Jason Bassford]

No bug or patch referenced as browser code change.

Comment 7

[Helder "Lthere" Magalhães]

(In reply to comment #6)
> No bug or patch referenced as browser code change.

Maybe bug 411852? Although bug 411852 wasn't yet fully fixed (so this is not a duplicate), recent changes towards fixing it seem to have caused this one to fade away...