1079572 - ImageLib reads back images from the GPU to do high quality downscaling

Status: NEW

(Core :: Graphics: ImageLib, defect)

Description

[Jeff Muizelaar [:jrmuizel]]

This happens in LockImageData(). We go down the DrawSurface path, and we should really only be going down that path during exceptional cases.

It's worth noting there's a copy of all of the image data happening here (from the SourceSurface into the destination). This copy could probably be avoided.

Here's a profile of the disaster happening:

http://people.mozilla.org/~bgirard/cleopatra/#report=93b4cd85c37981df04e107007d92186649add4bd

Comment 1

[Seth Fowler [:seth] [:s2h]]

I'd like to keep this around since more profile data is always nice, but the main action around this issue is happening in bug 1076674.