public IImage EndOffscreen()
{
var dimg = _offscreen;
drawcontext ctx = _prev.Pop();
_offscreen = ctx.img;
_c = ctx.c;
return(dimg);
}
public IImage ImageFromFile(string path)
{
var bmp = BitmapFactory.DecodeFile(path);
if (bmp == null)
{
return(null);
}
var dimg = new AndroidImage()
{
Bitmap = bmp
};
return(dimg);
}
public void BeginOffscreen(float width, float height, IImage img)
{
if (_prev == null)
{
_prev = new Stack <drawcontext> ();
}
_prev.Push(new drawcontext {
c = _c, img = _offscreen
});
_offscreen = null;
if (img != null)
{
var aimg = img as AndroidImage;
if (
(aimg.Bitmap.Width >= width) &&
(aimg.Bitmap.Height >= height))
{
_offscreen = img as AndroidImage;
}
else
{
img.Destroy();
}
}
if (null == _offscreen)
{
_offscreen = new AndroidImage();
_offscreen.Bitmap = Bitmap.CreateBitmap((int)width, (int)height, Bitmap.Config.Rgb565); // TODO what bitmap config?
}
_c = new Canvas();
_c.SetBitmap(_offscreen.Bitmap);
#if false
if (img != null)
{
SetColor(Xamarin.Forms.Color.Yellow);
FillRect(0, 0, _offscreen.Bitmap.Width, _offscreen.Bitmap.Height);
}
#endif
}