High color depth (> 8bpc) images do not display correctly as wallpapers

[ebassi (Emmanuele Bassi)]

@jakedane

IDK a lot about this but for the >8 bpc image problem the cause could be with how GdkPixbuf loads files, or if that supports >8 bpc images fine the cause could be with how Mutter displays such images. I’m not sure.

GdkPixbuf only supports 8 bits per color sample, and it won’t ever support more; this means that anything using GdkPixbuf to load images into a pixel buffer will only ever have access to 8 bpc for each pixel.