sciagent code + Gitea Actions CI/CD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shared/src/components/viewer/labelMask.ts

@@ -0,0 +1,32 @@
+/**
+ * Multi-label segmentation helpers (pure — no VTK, no DOM, unit-testable).
+ *
+ * A single labelsTr/<case>.nii.gz can encode many organs as integer voxel values
+ * (e.g. TotalSegmentator: 1..117). These split such a volume's scalar array into the
+ * distinct label values present, and into a per-value binary (0/1) mask the renderer
+ * can extract as one coloured iso-surface. The VTK wrappers live in `niftiLoader`.
+ */
+
+/** Distinct non-zero integer label values present in a segmentation's scalar array, ascending. */
+export function distinctLabelValues(scalars: ArrayLike<number>): number[] {
+  const seen = new Set<number>();
+  for (let i = 0; i < scalars.length; i++) {
+    const v = scalars[i];
+    if (v > 0 && Number.isInteger(v)) seen.add(v);
+  }
+  return [...seen].sort((a, b) => a - b);
+}
+
+/** A binary (0/1) Uint8Array mask: 1 where the scalar equals `value`, else 0. */
+export function binaryLabelMask(scalars: ArrayLike<number>, value: number): Uint8Array {
+  const out = new Uint8Array(scalars.length);
+  for (let i = 0; i < scalars.length; i++) {
+    if (scalars[i] === value) out[i] = 1;
+  }
+  return out;
+}
+
+/** True when a segmentation holds more than one distinct organ label (so it is worth splitting). */
+export function isMultiLabel(scalars: ArrayLike<number>): boolean {
+  return distinctLabelValues(scalars).length > 1;
+}