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authorDavid Herrmann <dh.herrmann@gmail.com>2014-09-19 14:05:52 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2014-09-19 14:05:52 +0200
commit650c5444273993f969b9cd7df9add6ab2df0414e (patch)
tree042d7d3412fff2b44e5328df70e143cba1acc231 /tools
parent2ec3ff668ff03410e94cfef8e3ee9384a8222211 (diff)
terminal: add graphics interface
The grdev layer provides graphics-device access via the libsystemd-terminal library. It will be used by all terminal helpers to actually access display hardware. Like idev, the grdev layer is built around session objects. On each session object you add/remove graphics devices as they appear and vanish. Any device type can be supported via specific card-backends. The exported grdev API hides any device details. Graphics devices are represented by "cards". Those are hidden in the session and any pipe-configuration is automatically applied. Out of those, we configure displays which are then exported to the API user. Displays are meant as lowest hardware entity available outside of grdev. The underlying pipe configuration is fully hidden and not accessible from the outside. The grdev tiling layer allows almost arbitrary setups out of multiple pipes, but so far we only use a small subset of this. More will follow. A grdev-display is meant to represent real connected displays/monitors. The upper level screen arrangements are user policy and not controlled by grdev. Applications are free to apply any policy they want. Real card-backends will follow in later patches.
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