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Vinzenz Schroeter
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# Contributing
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Contributions are accepted in any form (issues, documentation, feature requests, code, review, ...).
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All creatures welcome.
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If you have access, please contribute on the [CCCB Forgejo](https://git.berlin.ccc.de/servicepoint/servicepoint).
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Contributions on GitHub will be copied over and merged there.
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## Pull requests
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Feel free to create a PR, even if your change is not done yet.
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Mark your PR as a draft as long as you do not want it to be merged.
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The main branch is supposed to be a working version, including language bindings,
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which means sometimes your PR may be merged into a temporary development branch.
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Unit tests and documentation are required for the core library.
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## Language bindings
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Pull requests for your preferred language will be accepted.
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If there is no code generator, it should call the C ABI methods provided by `servicepoint_binding_c`.
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It should be able to send most of the basic commands in a way the simulator accepts, receiving is
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not required for the merge.
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It is okay for the feature set of a language binding to lag behind the one of the rust crate.
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This also means you do not have to expose a feature to all the language bindings when adding something to the core.
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If your change may break other language bindings, please note that in your PR description so someone can check them.
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[](https://crates.io/crates/servicepoint)
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[](https://crates.io/crates/servicepoint)
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[](https://docs.rs/servicepoint/latest/servicepoint/)
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[](../LICENSE)
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[](./LICENSE)
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In [CCCB](https://berlin.ccc.de/), there is a big pixel matrix hanging on the wall.
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It is called "Service Point Display" or "Airport Display".
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This crate contains C bindings for the `servicepoint` library, enabling users to parse, encode and send packets to this display via UDP.
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This crate contains C bindings for the [servicepoint](https://git.berlin.ccc.de/servicepoint/servicepoint) library, enabling users to parse, encode and send packets to this display via UDP.
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## Examples
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# About the display
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- Resolution: 352x160=56,320 pixels
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- Pixels are grouped into 44x20=880 tiles (8x8=64 pixels each)
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- Smallest addressable unit: row of pixels inside of a tile (8 pixels = 1 byte)
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- The brightness can only be set per tile
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- Screen content can be changed using a simple UDP protocol
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- Between each row of tiles, there is a gap of around 4 pixels size. This gap changes the aspect ratio of the display.
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### Binary format
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A UDP package sent to the display has a header size of 10 bytes.
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Each header value has a size of two bytes (unsigned 16 bit integer).
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Depending on the command, there can be a payload following the header.
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To change screen contents, these commands are the most relevant:
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1. Clear screen
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- command: `0x0002`
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- (rest does not matter)
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2. Send CP437 data: render specified text into rectangular region
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- command: `0x0003`
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- top left tile x
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- top left tile y
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- width in tiles
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- height in tiles
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- payload: (width in tiles * height in tiles) bytes
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- 1 byte = 1 character
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- each character is rendered into one tile (mono-spaced)
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- characters are encoded using code page 437
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3. Send bitmap window: set pixel states for a rectangular region
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- command: `0x0013`
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- top left tile x
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- top left _pixel_ y
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- width in tiles
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- height in _pixels_
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- payload: (width in tiles * height in pixels) bytes
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- network byte order
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- 1 bit = 1 pixel
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There are other commands implemented as well, e.g. for changing the brightness.
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