// trigger_seam — the shared Trigger play-span formula: how the stored %-length becomes the
// source-frame span the voice plays and the overlay draws over. One home so the engine's
// note-on resolve and the editor's overlay pack cannot disagree about where a Trigger note
// ends.
//
// playLengthFrames = round(lengthFraction * (frameCount - startFrame))

#pragma once

#include <cstdint>

namespace reasampler::instrument::map {

// postStart = max(0, frameCount - startFrame); playLength = round(lengthFraction * postStart).
// `startFrame` is the effective start point (0 when absent). Returns 0 when postStart == 0
// or lengthFraction <= 0.
std::int64_t triggerPlayLength(double lengthFraction,
                               std::int64_t frameCount,
                               std::int64_t startFrame);

}  // namespace reasampler::instrument::map