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Diffstat (limited to 'Horloge/MemDC.h')
| -rw-r--r-- | Horloge/MemDC.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/Horloge/MemDC.h b/Horloge/MemDC.h new file mode 100644 index 0000000..494fbbe --- /dev/null +++ b/Horloge/MemDC.h @@ -0,0 +1,104 @@ +#ifndef _MEMDC_H_
+#define _MEMDC_H_
+
+//////////////////////////////////////////////////
+// CMemDC - memory DC
+//
+// Author: Keith Rule
+// Email: keithr@europa.com
+// Copyright 1996-1999, Keith Rule
+//
+// You may freely use or modify this code provided this
+// Copyright is included in all derived versions.
+//
+// History - 10/3/97 Fixed scrolling bug.
+// Added print support. - KR
+//
+// 11/3/99 Fixed most common complaint. Added
+// background color fill. - KR
+//
+// 11/3/99 Added support for mapping modes other than
+// MM_TEXT as suggested by Lee Sang Hun. - KR
+//
+// This class implements a memory Device Context which allows
+// flicker free drawing.
+
+class CMemDC : public CDC {
+private:
+ CBitmap m_bitmap; // Offscreen bitmap
+ CBitmap* m_oldBitmap; // bitmap originally found in CMemDC
+ CDC* m_pDC; // Saves CDC passed in constructor
+ CRect m_rect; // Rectangle of drawing area.
+ BOOL m_bMemDC; // TRUE if CDC really is a Memory DC.
+public:
+
+ CMemDC(CDC* pDC, const CRect* pRect = NULL) : CDC()
+ {
+ ASSERT(pDC != NULL);
+
+ // Some initialization
+ m_pDC = pDC;
+ m_oldBitmap = NULL;
+ m_bMemDC = !pDC->IsPrinting();
+
+ // Get the rectangle to draw
+ if (pRect == NULL) {
+ pDC->GetClipBox(&m_rect);
+ } else {
+ m_rect = *pRect;
+ }
+
+ if (m_bMemDC) {
+ // Create a Memory DC
+ CreateCompatibleDC(pDC);
+ pDC->LPtoDP(&m_rect);
+
+ m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
+ m_oldBitmap = SelectObject(&m_bitmap);
+
+ SetMapMode(pDC->GetMapMode());
+ pDC->DPtoLP(&m_rect);
+ SetWindowOrg(m_rect.left, m_rect.top);
+ } else {
+ // Make a copy of the relevent parts of the current DC for printing
+ m_bPrinting = pDC->m_bPrinting;
+ m_hDC = pDC->m_hDC;
+ m_hAttribDC = pDC->m_hAttribDC;
+ }
+
+ // Fill background
+ FillSolidRect(m_rect, pDC->GetBkColor());
+ }
+
+
+ ~CMemDC()
+ {
+ 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);
+
+ //Swap back the original bitmap.
+ SelectObject(m_oldBitmap);
+ } 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
+ CMemDC* operator->()
+ {
+ return this;
+ }
+
+ // Allow usage as a pointer
+ operator CMemDC*()
+ {
+ return this;
+ }
+};
+
+#endif
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