Closed Bug 1228225 Opened 9 years ago Closed 9 years ago

Degraded appearance of interlaced PNG when downscaled

Categories

(Core :: Graphics: ImageLib, defect)

Product:
Core
Component:
Graphics: ImageLib
Type:
defect
Priority:
Not set
Severity:
major

Tracking

()

Status:
RESOLVED WORKSFORME
Tracking Flags:
Tracking Status
firefox45 --- affected

People

(Reporter: glennrp+bmo, Assigned: glennrp+bmo)

References

Details

(Keywords: regression, Whiteboard: gfx-noted)

Attachments

(1 obsolete file) 

Landing of bug #75077 has caused a regression in the appearance of downscaled interlaced PNGs.  The final (complete) pass is not displayed, resulting in a slightly lower resolution.  There's a simple one-line fix which I'll attach.

Image at  http://www.simplesystems.org/users/glennrp/grammie/grammie_downscaled.html
Compare the appearance of the frames of Grammie's glasses in the left image (downscaled) and the right image (not downscaled).  Use <ctrl-shift-plus> and <ctrl-shift-minus> to scale the whole page up and down, and notice the appearance of the glasses in both images.
Keywords: regression
Whiteboard: gfx-noted
Assignee: nobody → glennrp+bmo

    
    

    
  
Try?
Blocks: 75077
Flags: needinfo?(ryanvm)

    
  
Status: NEW → ASSIGNED

    
    

    
  
https://treeherder.mozilla.org/#/jobs?repo=try&revision=b0632c965379

Possible to reftest this?
Flags: needinfo?(ryanvm) → in-testsuite?

    
    

    
  
Comment on attachment 8692319 [details] [diff] [review]
v00-1228225-fix-appearance-of-interpolated-interlaced-pngs

Try run is all green.  R?

        Attachment #8692319 -
        Flags: review?(seth)

    
    

    
  
I can't reproduce the problem any more and was unable to create a reftest.
Status: ASSIGNED → RESOLVED
Closed: 9 years ago
Resolution: --- → WORKSFORME

    
  

        Attachment #8692319 -
        Attachment is obsolete: true

        Attachment #8692319 -
        Flags: review?(seth)

    
  
Flags: in-testsuite?

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