wlgol/openspec/changes/arena-size/design.md

Design

Context

Output is already bound and a listener exists, but mode dimensions are ignored. See proposal.md.

Goals / Non-Goals

Goals:

• Store output mode width/height.
• Compute default logical size = 0.8 * mode / scale.
• Keep grid resize/preserve behavior.

Non-Goals:

• Fullscreen mode.
• Dynamic output hotplug handling beyond first output.

Decisions

D1: Output mode storage

• Store output_width, output_height from wl_output.mode.

D2: Default size computation

• After roundtrip, if output info available, set logical size; else fallback 1024x576.

D3: Fallback

• 1024x576 logical (~80% of 1280x720) when no output info.

Open Questions

None.