internal static CarbonContext GetCGContextForView(IntPtr handle)
{
IntPtr context = IntPtr.Zero;
IntPtr port = IntPtr.Zero;
IntPtr window = IntPtr.Zero;
window = GetControlOwner(handle);
if (handle == IntPtr.Zero || window == IntPtr.Zero)
{
// FIXME: Can we actually get a CGContextRef for the desktop? this makes context IntPtr.Zero
port = GetQDGlobalsThePort();
CreateCGContextForPort(port, ref context);
Rect desktop_bounds = CGDisplayBounds(CGMainDisplayID());
return(new CarbonContext(port, context, (int)desktop_bounds.size.width, (int)desktop_bounds.size.height));
}
QDRect window_bounds = new QDRect();
Rect view_bounds = new Rect();
port = GetWindowPort(window);
context = GetContext(port);
GetWindowBounds(window, 32, ref window_bounds);
HIViewGetBounds(handle, ref view_bounds);
HIViewConvertRect(ref view_bounds, handle, IntPtr.Zero);
if (view_bounds.size.height < 0)
{
view_bounds.size.height = 0;
}
if (view_bounds.size.width < 0)
{
view_bounds.size.width = 0;
}
CGContextTranslateCTM(context, view_bounds.origin.x, (window_bounds.bottom - window_bounds.top) - (view_bounds.origin.y + view_bounds.size.height));
// Create the original rect path and clip to it
Rect rc_clip = new Rect(0, 0, view_bounds.size.width, view_bounds.size.height);
CGContextSaveGState(context);
Rectangle [] clip_rectangles = (Rectangle [])hwnd_delegate.DynamicInvoke(new object [] { handle });
if (clip_rectangles != null && clip_rectangles.Length > 0)
{
int length = clip_rectangles.Length;
CGContextBeginPath(context);
CGContextAddRect(context, rc_clip);
for (int i = 0; i < length; i++)
{
CGContextAddRect(context, new Rect(clip_rectangles [i].X, view_bounds.size.height - clip_rectangles [i].Y - clip_rectangles [i].Height, clip_rectangles [i].Width, clip_rectangles [i].Height));
}
CGContextClosePath(context);
CGContextEOClip(context);
#if DEBUG_CLIPPING
if (clip_rectangles.Length >= debug_threshold)
{
CGContextSetRGBFillColor(context, red, green, blue, 0.5f);
CGContextFillRect(context, rc_clip);
CGContextFlush(context);
System.Threading.Thread.Sleep(500);
if (red == 1.0f)
{
red = 0.0f; blue = 1.0f;
}
else if (blue == 1.0f)
{
blue = 0.0f; green = 1.0f;
}
else if (green == 1.0f)
{
green = 0.0f; red = 1.0f;
}
}
#endif
}
else
{
CGContextBeginPath(context);
CGContextAddRect(context, rc_clip);
CGContextClosePath(context);
CGContextClip(context);
}
return(new CarbonContext(port, context, (int)view_bounds.size.width, (int)view_bounds.size.height));
}
internal static extern int GetWindowBounds(IntPtr wHnd, uint reg, ref QDRect rect);
