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How all this icon stuff is going to work in Plasma 6

Posted by Rianne Schestowitz on Aug 13, 2023

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Today I want to discuss in detail our plans for icon theming in Plasma 6. It will be rather technical, but may be of interest if you’re a user, developer, or theme author who wants to know what (if anything) you’ll have to do differently for Plasma 6.

Let’s start by briefly reviewing the way FreeDesktop-compatible icon themes work. Icons in icon themes are named with standardized names, like edit-copy. A list of standard names can be found here. When an app wants the icon for a “Copy” action, it uses the API of its toolkit to ask for a themed icon named edit-copy. In Qt, this you use QIcon::fromTheme(). If an icon isn’t found by its name, the implementation is required to chop off the last word and try again. So if an app asks for edit-copy-path and an icon with that name isn’t found in the icon theme, it will look for edit-copy and return that instead. Icons can also come in multiple sizes, so that each icon can be optimized for being displayed at different sizes. There’s more to it than that, but it’s enough for now.

Over time, icon themes started doing something interesting: they changed the visual styling between sizes! For example in many icon themes, the symbolic monochrome style is used for icons’ 16px and 22/24px versions, and a full-color style is used for the 32px and larger versions. Breeze is one such icon theme. For example:

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