Found an interesting feature in OpenUI5.
If you use a device with retina display and component sap.m.Image with src=”your_image.png” OpenUI5 tries additionally to load “firstname.lastname@example.org” and show it instead of original image.
From official Doku:
Density related image will be loaded if image with density awareness name in format [imageName]@[densityValue].[extension] is provided. The valid desity values are 1, 1.5, 2. If the original devicePixelRatio isn’t one of the three valid numbers, it’s rounded up to the nearest one.