/// <summary>
/// Returns the cached brush corresponding to the parameters passed across. If no such brush
/// has been cached then a new cached brush is created and returned.
/// </summary>
/// <param name="red"></param>
/// <param name="green"></param>
/// <param name="blue"></param>
/// <param name="alpha"></param>
/// <returns></returns>
private VrsDrawing.IBrush GetOrCreateCachedBrush(int red, int green, int blue, int alpha)
{
var key = ColourHelper.PackColour(red, green, blue, alpha);
var map = _SolidBrushCache;
if (!map.TryGetValue(key, out var brush))
{
lock (_SyncLock) {
if (!_SolidBrushCache.TryGetValue(key, out brush))
{
brush = CreateBrushWrapper(red, green, blue, alpha, isCached: true);
map = CollectionHelper.ShallowCopy(_SolidBrushCache);
map.Add(key, brush);
_SolidBrushCache = map;
}
}
}
return(brush);
}
/// <summary>
/// See base docs.
/// </summary>
/// <returns></returns>
public override int GetHashCode()
{
return(ColourHelper.PackColour(Red, Green, Blue, Alpha).GetHashCode());
}