/// <summary>Captures a screenshot of a window using Windows GDI. Captures transparency.</summary>
/// <param name="handle">handle of the window to capture</param>
/// <returns>the captured window image</returns>
private static Image CaptureWindowWithGDI(Workflow wfgdi, IntPtr handle, out Rectangle windowRect)
{
Image windowImageGdi = null;
Bitmap whiteBGImage = null, blackBGImage = null, white2BGImage = null;
if (wfgdi.ActiveWindowTryCaptureChildren)
{
windowRect = new WindowRectangle(handle).CalculateWindowRectangle();
}
else
{
windowRect = CaptureHelpers.GetWindowRectangle(handle);
}
try
{
using (new Freeze(wfgdi, handle))
using (Form form = new Form())
{
form.BackColor = Color.White;
form.FormBorderStyle = FormBorderStyle.None;
form.ShowInTaskbar = false;
int offset = wfgdi.ActiveWindowIncludeShadows && !NativeMethods.IsWindowMaximized(handle) ? 20 : 0;
windowRect.Inflate(offset, offset);
windowRect.Intersect(CaptureHelpers.GetScreenBounds());
NativeMethods.ShowWindow(form.Handle, (int)WindowShowStyle.ShowNormalNoActivate);
NativeMethods.SetWindowPos(form.Handle, handle, windowRect.X, windowRect.Y, windowRect.Width, windowRect.Height, NativeMethods.SWP_NOACTIVATE);
Application.DoEvents();
whiteBGImage = (Bitmap)Screenshot.CaptureRectangleNative2(windowRect);
form.BackColor = Color.Black;
Application.DoEvents();
blackBGImage = (Bitmap)Screenshot.CaptureRectangleNative2(windowRect);
if (!wfgdi.ActiveWindowGDIFreezeWindow)
{
form.BackColor = Color.White;
Application.DoEvents();
white2BGImage = (Bitmap)Screenshot.CaptureRectangleNative2(windowRect);
}
}
if (wfgdi.ActiveWindowGDIFreezeWindow || whiteBGImage.AreBitmapsEqual(white2BGImage))
{
windowImageGdi = HelpersLib.GraphicsHelper.Core.ComputeOriginal(whiteBGImage, blackBGImage);
}
else
{
windowImageGdi = (Image)whiteBGImage.Clone();
}
}
finally
{
if (whiteBGImage != null)
{
whiteBGImage.Dispose();
}
if (blackBGImage != null)
{
blackBGImage.Dispose();
}
if (white2BGImage != null)
{
white2BGImage.Dispose();
}
}
if (windowImageGdi != null)
{
Rectangle windowRectCropped = HelpersLib.GraphicsHelper.Core.GetCroppedArea((Bitmap)windowImageGdi);
windowImageGdi = CaptureHelpers.CropImage(windowImageGdi, windowRectCropped);
if (wfgdi.DrawCursor)
{
#if DEBUG
DebugHelper.WriteLine("Fixed cursor position (before): " + windowRect.ToString());
#endif
windowRect.X += windowRectCropped.X;
windowRect.Y += windowRectCropped.Y;
#if DEBUG
DebugHelper.WriteLine("Fixed cursor position (after): " + windowRect.ToString());
#endif
}
}
return(windowImageGdi);
}
