public IBitmap ApplyArea(IArea area)
{
//todo: performance can be improved by only creating a bitmap the size of the area, and not the entire background.
//This will require to change the rendering as well to offset the location
byte zero = (byte)0;
Bitmap output = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
using (FastBitmap inBmp = new FastBitmap(_bitmap, ImageLockMode.ReadOnly))
{
using (FastBitmap outBmp = new FastBitmap(output, ImageLockMode.WriteOnly, true))
{
for (int y = 0; y < Height; y++)
{
int bitmapY = Height - y - 1;
for (int x = 0; x < Width; x++)
{
System.Drawing.Color color = inBmp.GetPixel(x, bitmapY);
byte alpha = area.IsInArea(new AGS.API.PointF(x, y)) ? color.A : zero;
outBmp.SetPixel(x, bitmapY, System.Drawing.Color.FromArgb(alpha, color));
}
}
}
}
return(new DesktopBitmap(output, _graphics));
}
public void SetPixels(AGS.API.Color color, List <API.Point> points)
{
using (FastBitmap bmp = new FastBitmap(_bitmap, ImageLockMode.WriteOnly))
{
foreach (var point in points)
{
bmp.SetPixel(point.X, point.Y, color.Convert());
}
}
}