Q-W1 pt2: core/shell/app relocation + sub-namespaces; one concrete ui::Rect (LTRB fork retired); slot_map split from bank_book; BankIndex→BankModel; 59/59 green

src/core/instrument/map/trigger_seam.cpp

@@ -0,0 +1,27 @@
+// trigger_seam.cpp — PURE Trigger-mode frames↔fraction converter (see trigger_seam.h).
+
+#include "core/instrument/map/trigger_seam.h"
+
+#include <algorithm>
+
+namespace reasampler::instrument::map {
+
+std::int64_t triggerPlayLength(double lengthFraction,
+                               std::int64_t frameCount,
+                               std::int64_t startFrame) {
+    const std::int64_t postStart = (std::max)(std::int64_t{0}, frameCount - startFrame);
+    if (postStart <= 0 || lengthFraction <= 0.0) return 0;
+    return static_cast<std::int64_t>(lengthFraction * static_cast<double>(postStart) + 0.5);
+}
+
+double framesToFadeFraction(std::int64_t fadeFrames, std::int64_t playLength) {
+    if (playLength <= 0) return 0.0;
+    return static_cast<double>(fadeFrames) / static_cast<double>(playLength);
+}
+
+std::int64_t fadeFractionToFrames(double fadeFraction, std::int64_t playLength) {
+    if (playLength <= 0) return 0;
+    return static_cast<std::int64_t>(fadeFraction * static_cast<double>(playLength) + 0.5);
+}
+
+}  // namespace reasampler::instrument::map