LosaDev source snapshot 2019

extra/LS_Service/LS_launcher/Batch/CUserMemDC.h

@@ -0,0 +1,150 @@
+#ifndef _MEMDC_H_
+#define _MEMDC_H_
+#include <afxwin.h>
+
+////////////////////////////////////////////////////////////////////////////////
+// CUserMemDC - memory DC
+//
+// Author: Keith Rule
+// Email:  [email protected]
+// Copyright 1996-2002, Keith Rule
+//
+// You may freely use or modify this code provided this
+// copyright is included in all derived versions.
+//
+// History -	10/03/97	Fixed scrolling bug.
+//							Added print support. - KR
+//
+//				11/03/99	Fixed most common complaint. Added
+//							background color fill. - KR
+//
+//				11/03/99	Added support for mapping modes other than
+//							MM_TEXT as suggested by Lee Sang Hun. - KR
+//
+//				02/11/02	Added support for CScrollView as supplied
+//							by Gary Kirkham. - KR
+//
+//				04/19/06	Modified background fill to try and use
+//							correct background brush/color - AGB
+//
+// This class implements a memory device context which allows
+// flicker free drawing.
+////////////////////////////////////////////////////////////////////////////////
+
+
+class CUserMemDC : public CDC
+{
+private:
+	BOOL		m_bMemDC;					// TRUE if not printing
+	CBitmap		m_MemBitmap;				// offscreen bitmap
+	CBitmap*	m_pOldBitmap;				// original bitmap
+	CDC*		m_pDC;						// saves CDC passed in constructor
+	CRect		m_rect;						// rectangle of drawing area
+
+public:
+	// constructor sets up the memory DC
+	CUserMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()
+	{
+		// make sure the call provided a valid device context
+		ASSERT(pDC != NULL);
+
+		// save the original device context for later BitBlt()
+		m_pDC = pDC;
+
+		// check whether we're printing
+		m_bMemDC = !pDC->IsPrinting();
+
+		// get the output rectangle
+		if (pRect == NULL)
+			pDC->GetClipBox(&m_rect);
+		else
+			m_rect = *pRect;
+
+		if (m_bMemDC)
+		{
+			// do the memory DC stuff if not printing
+
+			// create a memory DC
+			CreateCompatibleDC(pDC);
+
+			// create new bitmap and save old bitmap
+			pDC->LPtoDP(&m_rect);
+			m_MemBitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
+			m_pOldBitmap = SelectObject(&m_MemBitmap);
+			SetMapMode(pDC->GetMapMode());
+			SetWindowExt(pDC->GetWindowExt());
+			SetViewportExt(pDC->GetViewportExt());
+			pDC->DPtoLP(&m_rect);
+
+			// set window origin
+			SetWindowOrg(m_rect.left, m_rect.top);
+		}
+		else
+		{
+			// make a copy of the relevant parts of the original DC for printing
+			m_bPrinting = pDC->m_bPrinting;
+			m_hDC		= pDC->m_hDC;
+			m_hAttribDC = pDC->m_hAttribDC;
+		}
+
+		// fill background
+		CWnd* pWnd = pDC->GetWindow();
+		HWND hWnd = NULL;
+		if (pWnd != NULL)
+		{
+			hWnd = pWnd->m_hWnd;
+
+			if (hWnd != NULL)
+			{
+				if (GetClassLongPtr(hWnd, GCW_ATOM) == 32770)
+				{
+					// if window is a dialog box, use dialog background color
+					FillSolidRect(m_rect, GetSysColor(COLOR_BTNFACE));
+				}
+				else
+				{
+					// try to get background brush for window class
+					ULONG_PTR ulpBrush = GetClassLongPtr(hWnd, GCLP_HBRBACKGROUND);
+					if (ulpBrush)
+					{
+						// fill with class background brush
+						FillRect(m_rect, CBrush::FromHandle((HBRUSH)ulpBrush));
+					}
+					else
+						hWnd = NULL;
+				}
+			}
+		}
+		if (hWnd == NULL)
+			FillSolidRect(m_rect, pDC->GetBkColor());
+	}
+
+	// destructor copies the contents of the memory DC to the original DC
+	~CUserMemDC()
+	{
+		if (m_bMemDC)
+		{
+			// copy the offscreen bitmap onto the screen
+			m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
+						  this, m_rect.left, m_rect.top, SRCCOPY);
+
+			// restore the original bitmap
+			m_pDC->SelectObject(m_pOldBitmap);
+		}
+		else
+		{
+			// all we need to do is replace the DC with an illegal value,
+			// this keeps us from accidently deleting the handles associated
+			// with the CDC that was passed to the constructor
+			m_hDC = m_hAttribDC = NULL;
+		}
+	}
+
+	// allow usage as a pointer
+	CUserMemDC* operator->() { return this; }
+
+	// allow usage as a pointer
+	operator CUserMemDC*() { return this; }
+};
+
+#endif											//#ifndef _MEMDC_H_