internal static CocoaContext GetCGContextForNSView(IntPtr handle)
{
if (handle == IntPtr.Zero)
{
return(null);
}
IntPtr focusView = objc_msgSend(objc_getClass("NSView"), sel_registerName("focusView"));
IntPtr focusHandle = IntPtr.Zero;
if (focusView != handle)
{
if (!bool_objc_msgSend(handle, sel_registerName("lockFocusIfCanDraw")))
{
return(null);
}
focusHandle = handle;
}
IntPtr windowHandle = objc_msgSend(handle, sel_registerName("window"));
IntPtr graphicsContext = objc_msgSend(windowHandle, sel_registerName("graphicsContext"));
IntPtr ctx = objc_msgSend(graphicsContext, sel_registerName("graphicsPort"));
bool isFlipped = bool_objc_msgSend(handle, sel_registerName("isFlipped"));
Size size;
CGContextSaveGState(ctx);
if (IntPtr.Size == 4)
{
CGRect32 bounds = new CGRect32();
objc_msgSend_stret(ref bounds, handle, sel_registerName("bounds"));
if (isFlipped)
{
CGContextTranslateCTM32(ctx, bounds.origin.x, bounds.size.height);
CGContextScaleCTM32(ctx, 1.0f, -1.0f);
}
size = new Size((int)bounds.size.width, (int)bounds.size.height);
}
else
{
CGRect64 bounds = new CGRect64();
objc_msgSend_stret(ref bounds, handle, sel_registerName("bounds"));
if (isFlipped)
{
CGContextTranslateCTM64(ctx, bounds.origin.x, bounds.size.height);
CGContextScaleCTM64(ctx, 1.0f, -1.0f);
}
size = new Size((int)bounds.size.width, (int)bounds.size.height);
}
return(new CocoaContext(focusHandle, ctx, size.Width, size.Height));
}
public static extern void objc_msgSend_stret(ref CGRect64 arect, IntPtr basePtr, IntPtr selector);