nordisk/znippy-zoomies

.nornir/assets/single-pass-vtd.svg

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    .store{fill:#123a1e;stroke:#7fe0a0;stroke-width:1.5}
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  <rect class="box" x="14" y="24" width="150" height="52" rx="6"/>
  <text class="t" x="24" y="46">bz2 stream</text>
  <text class="dim" x="24" y="64">non-seekable</text>
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  <text class="t" x="212" y="46">BoundaryDetector</text>
  <text class="dim" x="212" y="64">&lt;way / &lt;relation, streaming</text>
  <line class="arr" x1="164" y1="50" x2="200" y2="50"/>
  <text class="dim" x="166" y="42">chunks</text>

  <rect class="disc" x="14" y="150" width="300" height="70" rx="6"/>
  <text class="acc" x="26" y="176">① node prologue</text>
  <text class="t" x="26" y="196">scan · COUNT · discard</text>
  <text class="dim" x="26" y="212">index-only, no store (mandatory decompress)</text>

  <rect class="store" x="430" y="150" width="316" height="70" rx="6"/>
  <text class="acc" x="442" y="176">② ways + relations</text>
  <text class="t" x="442" y="196">store ElemIndex (byte-identical)</text>
  <text class="dim" x="442" y="212">offsets absolute in-stream, seek-free</text>

  <line class="arr" x1="300" y1="76" x2="160" y2="150"/>
  <line class="arr" x1="300" y1="76" x2="500" y2="150"/>
  <text class="acc" x="300" y="120">node→way boundary — FLIP</text>
  <text class="dim" x="330" y="138">(first &lt;way offset)</text>
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