Module kernel::services::emb_display

[embedded-graphics] display driver

This is an early attempt at a “frame buffer” style display driver.

This implementation is sort of a work in progress, it isn’t really a great long-term solution, but rather “okay for now”.

A framebuffer of pixels is allocated for the entire display on registration. This could be, for example, 400x240 pixels.

The driver will then allow for a certain number of “sub frames” to be requested.

These sub frames could be for the entire display (400x240), or a portion of it, for example 200x120 pixels.

Clients of the driver can draw into the sub-frames that they receive, then send them back to be rendered into the total frame. Any data in the client’s sub-frame will replace the current contents of the whole frame buffer.

The current server assumes 8 bits per pixel, which is implementation defined for color/greyscale format (sorry).

Structs

• EmbDisplayClient
  Client interface to EmbDisplayService.
• EmbDisplayService
  Registered driver type for the EmbDisplay service.
• FrameChunk
  FrameChunk is recieved after client has sent a request for one

Enums

• FrameError
• Request
  These are all of the possible requests from client to server
• Response