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;
UIImage output;
using (FastBitmap inBmp = new FastBitmap(_cgImage))
{
using (FastBitmap outBmp = new FastBitmap(Width, Height))
{
for (int y = 0; y < Height; y++)
{
int bitmapY = Height - y - 1;
for (int x = 0; x < Width; x++)
{
var color = inBmp.GetPixel(x, bitmapY);
byte alpha = area.IsInArea(new AGS.API.PointF(x, y)) ? color.A : zero;
outBmp.SetPixel(x, bitmapY, Color.FromRgba(color.R, color.G, color.B, alpha));
}
}
output = outBmp.GetImage();
}
}
return(new IOSBitmap(output, _graphics));
}
public Color GetPixel(int x, int y)
{
using (FastBitmap bitmap = new FastBitmap(_cgImage))
{
return(bitmap.GetPixel(x, y));
}
}
//http://stackoverflow.com/questions/633722/how-to-make-one-color-transparent-on-a-uiimage
public void MakeTransparent(Color color)
{
var transparent = Colors.Transparent;
using (FastBitmap fastBitmap = new FastBitmap(_cgImage))
{
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
if (fastBitmap.GetPixel(x, y).Equals(color))
{
fastBitmap.SetPixel(x, y, transparent);
}
}
}
setImage(fastBitmap.GetImage());
}
}
