boolean DrawingOnBackground(int, int);
boolean DrawingAreaChanged();
void BlitBitmapOnBackground(Bitmap *, Bitmap *, int, int, int, int, int, int);
+void BlitTexture(Bitmap *, int, int, int, int, int, int);
+void BlitTextureMasked(Bitmap *, int, int, int, int, int, int);
void DrawSimpleBlackLine(Bitmap *, int, int, int, int);
void DrawSimpleWhiteLine(Bitmap *, int, int, int, int);
void DrawLines(Bitmap *, struct XY *, int, Pixel);