music_library/backlog/completed/ml-183 - Scale-Presto-full-resolution-layout.md

id, title, status, assignee, created_date, updated_date, labels, dependencies, modified_files, priority, ordinal

id	title	status	assignee	created_date	updated_date	labels	dependencies	modified_files	priority	ordinal
ML-183	Scale Presto full-resolution layout	Done	codex	2026-05-15 07:01	2026-05-15 07:19	presto		presto/main.py presto/poc.py presto/README.md	medium	17000

Description

Adjust the Presto MicroPython app after enabling full-resolution 480x480 mode so controls, spacing, and bitmap text render at approximately the same physical size they had in the default doubled-pixel mode.

Acceptance Criteria

• #1 All hardcoded layout measurements in the Presto app are reviewed and scaled appropriately for full-resolution coordinates.
• #2 Bitmap font scale values are reviewed and adjusted so visible text is not unexpectedly small after full_res=True.
• #3 The app source passes the documented Python syntax check without writing pycache.

Implementation Plan

1. Scale fixed pixel constants in presto/main.py for full-resolution coordinates, using 2x values as the baseline and small fit adjustments where a strict double would push content offscreen.
2. Replace bitmap font scale usages in presto/main.py with named full-resolution scale constants so text returns to its prior physical size.
3. Apply the same full-resolution scaling to the small presto/poc.py proof-of-concept constants since it was also moved to full_res=True.
4. Re-scan for stale unscaled literals that affect layout or font rendering, then run the documented py_compile syntax check without creating __pycache__.

Implementation Notes

Scaled main Presto layout constants and bitmap font scale values for full-resolution coordinates. Calendar and keyboard use small fit adjustments from strict 2x values to avoid bottom overflow at 480x480. Row thumbnails now prefer the 150px mini cover source so 80px full-resolution row images do not render from a 40px micro image.

Final Summary

Scaled the Presto full-resolution UI so the move to Presto(full_res=True) keeps roughly the same physical sizing as the previous default doubled-pixel mode. main.py now uses named scale constants and a px() helper for layout measurements, font scales, row heights, scroll indicators, touch drag thresholds, headers, buttons, detail spacing, and keyboard geometry. Calendar cells and keyboard key height use small fit adjustments so their bottom rows stay within 480x480.

poc.py was scaled with the same 2x coordinate approach. The README thumbnail note was updated because row thumbnails now prefer mini_cover_url, avoiding 40px micro images inside the larger full-resolution row thumbnail box.

Verified with the documented py_compile syntax check for main.py and poc.py; no __pycache__ output was written.