// Overridable function which generates the image for a tile on the map.
// Child classes could choose override "TileDrawer" instead. The advantage of overriding
// this function is that the image will be cached.
protected virtual Cairo.Surface GenerateTileImage(int x, int y)
{
RoomLayout layout = GetRoomLayout(x, y);
var tileSurface = this.Window.CreateSimilarSurface(Cairo.Content.Color,
(int)(layout.Width * 16 * _scale), (int)(layout.Height * 16 * _scale));
// The below line works fine, but doesn't look as good on hidpi monitors
//_surface = new Cairo.ImageSurface(Cairo.Format.Rgb24,
// (int)(layout.Width * 16 * _scale), (int)(layout.Height * 16 * _scale));
Bitmap img = layout.GetImage();
using (var cr = new Cairo.Context(tileSurface))
using (var source = new BitmapSurface(img)) {
cr.Scale(_scale, _scale);
cr.SetSource(source, 0, 0);
cr.Paint();
}
return(tileSurface);
}