internal void Redraw()
{
_forceLayout = true;
if (CellBitmap != null)
{
var bit = CellBitmap;
Bitmaps.Remove(this);
bit.Dispose();
mem -= Width * Height * 4;
}
Invalidate();
}
private bool InitializeBitmap()
{
if (!_forceLayout && CellBitmap != null && CellBitmap.Width == Width && CellBitmap.Height == Height)
{
return(false);
}
if (CellBitmap != null)
{
mem -= CellBitmap.Width * CellBitmap.Height * 4;
CellBitmap.Dispose();
}
//Peg to 10MB
const int megs = 10;
if (mem + (Width * Height * 4) > megs * 1024 * 1024)
{
// decimate memory usage
while (mem + (Width * Height * 4) > 1024 * 1024)
{
var bit = Bitmaps.FirstOrDefault();
if (bit.Value == null)
{
break;
}
mem -= bit.Value.Width * bit.Value.Height * 4;
Bitmaps.Remove(bit.Key);
bit.Value.Dispose();
}
}
try
{
Bitmaps[this] = new Bitmap(Width, Height);
mem += Width * Height * 4;
}
catch (OutOfMemoryException)
{
return(false);
}
return(true);
}