00ffd7970e
Phase 1 — VisualizerStorageManager.swift VisFrameBuffer is a flat ContiguousArray<Float> with frameCount and pointsPerFrame. All frame data for a track lives in one contiguous allocation rather than a [[Float]] array-of-arrays. loadCache now uses Data(contentsOf:options:.alwaysMapped) — the OS maps the file into virtual memory and faults pages in on demand rather than reading the whole file into heap. copyFrame(at:into:) copies a frame slice directly into _audioLevels using initialize(from:) — no intermediate [Float] created. Phase 2 — MitsuhaVisualizerView.swift + AudioPlayer.swift VisualizerLevelBox now pre-allocates targetLevels, displayLevels, idleLevels, and the full 16-slot history ring on first use via resizeIfNeeded. This only triggers when numberOfPoints changes (rare — settings slider). updateDisplayLevels writes directly into box.targetLevels throughout — no var targetLevels = [Float](), no map, no append. The history ring buffer now copies in-place into pre-allocated slots, eliminating the COW trigger on every frame. drawIdleState uses box.idleLevels — no Array(repeating:). The Canvas body no longer falls back to Array(repeating:) since displayLevels is always pre-allocated. The timer in AudioPlayer now calls buf.copyFrame(at:into:&_audioLevels) directly — no intermediate [Float] copy. Phase 3 — View invalidation + drawBars fix fillColors hoisted out of the drawBars per-bar loop — it was allocating a new [Color] array count times per frame (8–24 allocations per draw call at 60fps). Now computed once before the loop. @ObservedObject var settings and @StateObject private var box are correct — box has zero @Published properties so it never triggers parent redraws. The Canvas closure only captures tickDate which changes every tick, ensuring per-tick re-execution without touching SwiftUI’s diffing engine. |
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