/// <summary>
/// Removes the surface associated with the given key.
/// </summary>
/// <param name="key">The key of the surface to remove.</param>
/// <returns>The DirectDrawSurface being removed.</returns>
internal DirectDrawSurface Remove(string key)
{
DirectDrawSurface ddSurface = null;
if (string.IsNullOrEmpty(key))
{
return(null);
}
if (sprites.ContainsKey(key))
{
ddSurface = (DirectDrawSurface)sprites[key];
sprites.Remove(key);
}
return(ddSurface);
}
/// <summary>
/// Adds a new string to the text surface manager. This creates
/// the associated text surface so that text can be rendered with
/// a fast Blt rather than with a DrawText call. Note that caching
/// could be done in a much more efficient manner and some text
/// surfaces will have identical contents.
/// </summary>
/// <param name="key">The string to add.</param>
internal void Add(string key)
{
if (string.IsNullOrEmpty(key))
{
return;
}
// Set up the surface
var rect = new RECT();
var ddSurface = new DirectDrawSurface(StandardFontRect.Right, StandardFontRect.Bottom)
{
TransparencyKey = DirectDrawSurface.MagentaColorKey
};
// Color in the back and add the text
ddSurface.Surface.BltColorFill(ref rect, DirectDrawSurface.MagentaColorKey.low);
ddSurface.Surface.SetForeColor(0);
var text = key;
if (text.Length > 16)
{
text = text.Substring(0, 16);
text += "...";
}
var dcHandle = new IntPtr(ddSurface.Surface.GetDC());
var graphics = Graphics.FromHdc(dcHandle);
var font = new Font("Verdana", 6.75f, FontStyle.Regular);
graphics.DrawString(text, font, Brushes.Black, 1, 1);
graphics.DrawString(text, font, Brushes.WhiteSmoke, 0, 0);
font.Dispose();
graphics.Dispose();
ddSurface.Surface.ReleaseDC(dcHandle.ToInt32());
sprites.Add(key, ddSurface);
}
