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planning: note free pan/zoom mode for display viewer

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Current anchor system only handles fixed alignment; free mode needed
for arbitrary pan offset + zoom level, e.g. microscope inspection.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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mikael-lovqvists-claude-agent
2026-03-30 00:46:52 +00:00
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@@ -132,6 +132,7 @@ These are open questions tracked in `architecture.md` that do not need to be res
- Hard vs soft byte budget limits - Hard vs soft byte budget limits
- Cooperative capture release: if a capture source has no live downstream targets for a configurable time window, stop capture and release the device. Intended as a resource-conservation policy rather than an immediate reaction to disconnect events. Requires the node to track downstream liveness (e.g. last successful send timestamp per output) and implement a reaper timer. - Cooperative capture release: if a capture source has no live downstream targets for a configurable time window, stop capture and release the device. Intended as a resource-conservation policy rather than an immediate reaction to disconnect events. Requires the node to track downstream liveness (e.g. last successful send timestamp per output) and implement a reaper timer.
- Unified device model: active display windows should be registered as devices alongside V4L2 cameras, using the same ENUM_DEVICES / ENUM_CONTROLS / GET_CONTROL / SET_CONTROL protocol. START_DISPLAY would return a device_id for the opened window; controls (scale, anchor, position, size, zoom, pan) are then addressable as (device_id, control_id) pairs like any other device. Requires a device_type field in ENUM_DEVICES responses so controllers can distinguish V4L2 devices from display windows. Future device types: codec processes, screen grab sources. This extends naturally to shader-based post-processing and other viewer state as controls. - Unified device model: active display windows should be registered as devices alongside V4L2 cameras, using the same ENUM_DEVICES / ENUM_CONTROLS / GET_CONTROL / SET_CONTROL protocol. START_DISPLAY would return a device_id for the opened window; controls (scale, anchor, position, size, zoom, pan) are then addressable as (device_id, control_id) pairs like any other device. Requires a device_type field in ENUM_DEVICES responses so controllers can distinguish V4L2 devices from display windows. Future device types: codec processes, screen grab sources. This extends naturally to shader-based post-processing and other viewer state as controls.
- Display viewer free pan/zoom mode: the current anchor system (center/topleft) only covers fixed alignment. A "free" mode should allow the controller (or the user via mouse/keyboard in the window) to set arbitrary pan offset and zoom level independently of the scale mode. The xorg viewer would need pan_x/pan_y (normalised or pixel offsets) and zoom_factor controls alongside the existing scale/anchor. This is a prerequisite for use cases like microscope inspection where the user needs to freely navigate a high-resolution source.
- controller_cli is a temporary dev tool; the long-term replacement is a dedicated `controller` binary outside `dev/cli/` that maintains simultaneous connections to all discovered nodes (not switching between them). Commands address a specific node by peer index. This mirrors the web UI's model of administering the whole network rather than one node at a time. The `connect` / active-connection model in the current controller_cli is an interim design choice that should not be carried forward. - controller_cli is a temporary dev tool; the long-term replacement is a dedicated `controller` binary outside `dev/cli/` that maintains simultaneous connections to all discovered nodes (not switching between them). Commands address a specific node by peer index. This mirrors the web UI's model of administering the whole network rather than one node at a time. The `connect` / active-connection model in the current controller_cli is an interim design choice that should not be carried forward.
- start-ingest peer addressing: the `dest_host` + `dest_port` in START_INGEST is awkward to type manually and requires the caller to know the target's TCP port. Should accept a peer ID (index from the discovered peer table on the node) so the node can resolve the address itself. Requires the node to run discovery and expose its peer table. - start-ingest peer addressing: the `dest_host` + `dest_port` in START_INGEST is awkward to type manually and requires the caller to know the target's TCP port. Should accept a peer ID (index from the discovered peer table on the node) so the node can resolve the address itself. Requires the node to run discovery and expose its peer table.
- Connection multiplexing: currently each ingest stream opens its own outbound TCP connection to the destination. Multiple streams between the same two peers should share one connection, with stream_id used to demultiplex frames. This is the priority/encapsulation scheme described in the architecture — high-priority and low-latency frames from different streams travel over the same socket rather than competing across separate sockets. - Connection multiplexing: currently each ingest stream opens its own outbound TCP connection to the destination. Multiple streams between the same two peers should share one connection, with stream_id used to demultiplex frames. This is the priority/encapsulation scheme described in the architecture — high-priority and low-latency frames from different streams travel over the same socket rather than competing across separate sockets.