[To-do]Fake thumbnails should get created first for all photos, then replaced with thumbnails

[Churchy Zheng]

Fake thumbnails should get created first for all photos, then replaced with thumbnails. When there are many photos (e.g. 1000), there is no placeholder for the photo until the thumbnail is created. Instead, there should be a placeholder with a simple graphic for every photo so that the user can scroll through the list and select a photo. Thumbnails then replace the place holder when time allows. Currently the thumbnails start showing up and continue until finished and the user has no idea how many photos are in the list.

[Rusty Lynch (rusty-lynch-intel)]

Using default thumbnails also has it's down side in that it takes more CPU cycles away while the thumbnailer thread is attempting to create thumbnails.

We will have to do some prototyping to determine what the best approach is, but the end result needs to be a smooth user experience.

NOTE: One small twist on this approach would be to fill in the view with a very simple thumbnail, and then have the thumbnailer thread only work on thumbnails that are currently in view.

[Rusty Lynch (rusty-lynch-intel)]

The basic functionality now exists inside the thumbnail creation thread to support the requirested user experience, but after experimenting with the implementation for different size photo sample sets, the feature seemed to hurt (instead of help) the user experience. As a result of the prototyping, we decided to disable the feature for M9.