DisplaySurface

Framebuffer surface compositor with dirty-frame publishing.

The module owns a MonoCanvas and publishes DisplaySurface::Frame messages on the configured frame topic. Backends such as SSD1306 subscribe to that topic and flush the framebuffer to hardware. The current canvas helper targets 128x64 monochrome vertical-tiled framebuffers, while DisplaySurface::Frame::PixelFormat keeps the backend contract open for later color formats.

MonoCanvas is intentionally close to Zephyr CFB's small-surface model:

• Clear, SetPixel, GetPixel
• DrawLine, DrawHorizontalLine, DrawVerticalLine
• DrawRect, FillRect
• DrawCircle, FillCircle
• InvertArea
• DrawChar, DrawText

Drawing calls update a dirty rectangle. DisplaySurface::PublishDirtyFrame() publishes only that dirty region; DisplaySurface::PublishFullFrame() forces a full refresh.

Required Hardware

None

Constructor Arguments

• frame_topic_name: topic name used for DisplaySurface::Frame
• refresh_interval_ms: periodic dirty-frame publish interval

Template Arguments

None

Depends

None