public override float GetTextureAlpha(object textureHandle, Point p)
{
Texture texture = SafeResolveTexture(textureHandle);
if (p.X > texture.Width || p.Y > texture.Height)
{
return(0);
}
using (var buffer = texture.GetBuffer())
{
var pb = buffer.Lock(new Box(p.X, p.Y, p.X + 1, p.Y + 1), HardwareBuffer.LockOptions.HBL_DISCARD);
unsafe
{
ColourValue cv;
ColourValue *cvptr = &cv;
PixelUtil.UnpackColour(cvptr, PixelFormat.PF_BYTE_RGBA, pb.data.ToPointer());
buffer.Unlock();
return(cv.A);
}
}
}