tryGet method

Paragraph? tryGet(int codepoint, int fg, { bool bold = false, bool italic = false, bool wide = false, })

Returns a cached paragraph, or builds one if under the per-frame budget. Returns null when the budget is exhausted (the painter schedules a warmup frame and the glyph fills in next frame).

Implementation

ui.Paragraph? tryGet(int codepoint, int fg,
    {bool bold = false, bool italic = false, bool wide = false}) {
  final key = (codepoint << 27) ^
      ((bold ? 1 : 0) << 26) ^
      ((italic ? 1 : 0) << 25) ^
      ((wide ? 1 : 0) << 24) ^
      (fg & 0xFFFFFF);
  final existing = _cache.remove(key); // remove+reinsert = LRU touch
  if (existing != null) {
    _cache[key] = existing;
    return existing;
  }
  if (_buildsThisFrame >= maxBuildsPerFrame) return null;
  _buildsThisFrame++;
  final p = _build(codepoint, fg, bold: bold, italic: italic, wide: wide);
  _cache[key] = p;
  if (_cache.length > maxEntries) {
    _cache.remove(_cache.keys.first); // evict eldest
  }
  return p;
}