private IntPtr GetRegion()
{
IntPtr hShadowReg = IntPtr.Zero;
IntPtr hOwnerReg = IntPtr.Zero;
IntPtr hRegion = IntPtr.Zero;
try
{
var rect = new RECT();
User32.GetWindowRect(_handle, ref rect);
int width = rect.right - rect.left;
int height = rect.bottom - rect.top;
hShadowReg = Gdi32.CreateRectRgn(0, 0, width, height);
hOwnerReg = Gdi32.CreateRectRgn(GetRegionRect());
hRegion = CombineRgn(hShadowReg, hOwnerReg, 4);
}
finally
{
if (hShadowReg != IntPtr.Zero)
{
Gdi32.DeleteObject(hShadowReg);
}
if (hOwnerReg != IntPtr.Zero)
{
Gdi32.DeleteObject(hOwnerReg);
}
}
return(hRegion);
}
private void ExcludeRegion()
{
if (!ShouldExlcudeRegion)
{
return;
}
IntPtr hRegion = IntPtr.Zero;
try
{
hRegion = GetRegion();
if (hRegion != IntPtr.Zero)
{
Gdi32.SetWindowRgn(Handle, hRegion, false);
}
if (Region != IntPtr.Zero)
{
Gdi32.DeleteObject(Region);
}
Region = hRegion;
}
finally
{
if (hRegion != IntPtr.Zero)
{
Gdi32.DeleteObject(hRegion);
}
}
}
internal void Close()
{
if (Region != IntPtr.Zero)
{
Gdi32.SetWindowRgn(Handle, IntPtr.Zero, false);
Gdi32.DeleteObject(Region);
}
User32.CloseWindow(_handle);
User32.SetParent((int)_handle, 0);
User32.DestroyWindow(_handle);
}
private void DrawToLayeredWindow()
{
RECT rect = new RECT();
User32.GetWindowRect(_handle, ref rect);
int width = rect.right - rect.left;
int height = rect.bottom - rect.top;
if (width == 0 || height == 0)
{
return;
}
POINT newLocation = new POINT(rect.left, rect.top);
SIZE newSize = new SIZE(width, height);
IntPtr screenDc = User32.GetDC(IntPtr.Zero);
IntPtr memDc = Gdi32.CreateCompatibleDC(screenDc);
using (Bitmap bmp = GetBitmap(width, height))
{
IntPtr hBitmap = bmp.GetHbitmap(_transparent);
IntPtr hOldBitmap = Gdi32.SelectObject(memDc, hBitmap);
User32.UpdateLayeredWindow(_handle, screenDc, ref newLocation, ref newSize, memDc, ref _ptZero, 0, ref _blend, 0x02);
User32.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
Gdi32.SelectObject(memDc, hOldBitmap);
Gdi32.DeleteObject(hBitmap);
}
}
Gdi32.DeleteDC(memDc);
GC.Collect();
}
