resize method

void resize(int newWidth, int newHeight)

Resizes the buffer to the new dimensions, preserving existing content where it fits.

Implementation

void resize(int newWidth, int newHeight) {
  Tracer.record(_traceResizeId, Phase.begin);
  try {
    newWidth = max(0, newWidth);
    newHeight = max(0, newHeight);
    final newCells = List.generate(newWidth * newHeight, (_) => Cell.empty());
    for (var y = 0; y < newHeight; y++) {
      for (var x = 0; x < newWidth; x++) {
        final targetIdx = y * newWidth + x;
        if (x < width && y < height) {
          final sourceCell = cells[_index(x, y)];
          newCells[targetIdx].char = sourceCell.char;
          newCells[targetIdx].style = sourceCell.style;
        }
      }
    }
    width = newWidth;
    height = newHeight;
    cells = newCells;
  } finally {
    Tracer.record(_traceResizeId, Phase.end);
  }
}