src/Utils/MiscUI/BufferDC.cpp

   1 #include "StdAfx.h"\r
   2 #include "BufferDC.h"\r
   3 \r
   4 IMPLEMENT_DYNAMIC(CBufferDC, CPaintDC)\r
   5 \r
   6 CBufferDC::CBufferDC(CWnd* pWnd) : CPaintDC(pWnd)\r
   7 {\r
   8         if (pWnd != NULL && CPaintDC::m_hDC != NULL)\r
   9         {\r
  10                 m_hOutputDC    = CPaintDC::m_hDC;\r
  11                 m_hAttributeDC = CPaintDC::m_hAttribDC;\r
  12 \r
  13                 pWnd->GetClientRect(&m_ClientRect);\r
  14 \r
  15                 m_hMemoryDC = ::CreateCompatibleDC(m_hOutputDC);\r
  16 \r
  17                 m_hPaintBitmap =\r
  18                         ::CreateCompatibleBitmap(\r
  19                                         m_hOutputDC,\r
  20                                         m_ClientRect.right  - m_ClientRect.left,\r
  21                                         m_ClientRect.bottom - m_ClientRect.top);\r
  22 \r
  23                 m_hOldBitmap = (HBITMAP)::SelectObject(m_hMemoryDC, m_hPaintBitmap);\r
  24 \r
  25                 CPaintDC::m_hDC       = m_hMemoryDC;\r
  26                 CPaintDC::m_hAttribDC = m_hMemoryDC;\r
  27         }\r
  28 \r
  29         m_bBoundsUpdated = FALSE;\r
  30 }\r
  31 \r
  32 CBufferDC::~CBufferDC(void)\r
  33 {\r
  34         Flush();\r
  35 \r
  36         ::SelectObject(m_hMemoryDC, m_hOldBitmap);\r
  37         ::DeleteObject(m_hPaintBitmap);\r
  38 \r
  39         CPaintDC::m_hDC           = m_hOutputDC;\r
  40         CPaintDC::m_hAttribDC = m_hAttributeDC;\r
  41 \r
  42         ::DeleteDC(m_hMemoryDC);\r
  43 }\r
  44 \r
  45 void CBufferDC::Flush()\r
  46 {\r
  47         ::BitBlt(\r
  48                 m_hOutputDC,\r
  49                 m_ClientRect.left, m_ClientRect.top,\r
  50                 m_ClientRect.right  - m_ClientRect.left, \r
  51                 m_ClientRect.bottom - m_ClientRect.top,\r
  52                 m_hMemoryDC,\r
  53                 0, 0,\r
  54                 SRCCOPY);\r
  55 }\r
  56 \r
  57 UINT CBufferDC::SetBoundsRect( LPCRECT lpRectBounds, UINT flags )\r
  58 {\r
  59         if (lpRectBounds != NULL)\r
  60         {\r
  61                 if (m_ClientRect.right  - m_ClientRect.left > lpRectBounds->right  - lpRectBounds->left ||\r
  62                         m_ClientRect.bottom - m_ClientRect.top  > lpRectBounds->bottom - lpRectBounds->top)\r
  63                 {\r
  64                         lpRectBounds = &m_ClientRect;\r
  65                 }\r
  66 \r
  67                 HBITMAP bmp =\r
  68                         ::CreateCompatibleBitmap(\r
  69                                         m_hOutputDC, \r
  70                                         lpRectBounds->right - lpRectBounds->left, \r
  71                                         lpRectBounds->bottom - lpRectBounds->top);\r
  72 \r
  73                 HDC tmpDC  = ::CreateCompatibleDC(m_hOutputDC);\r
  74                 \r
  75                 HBITMAP oldBmp = (HBITMAP)::SelectObject(tmpDC, bmp);\r
  76 \r
  77                 ::BitBlt(\r
  78                         tmpDC,\r
  79                         m_ClientRect.left, m_ClientRect.top,\r
  80                         m_ClientRect.right  - m_ClientRect.left, \r
  81                         m_ClientRect.bottom - m_ClientRect.top,\r
  82                         m_hMemoryDC,\r
  83                         0, 0,\r
  84                         SRCCOPY);\r
  85 \r
  86                 ::SelectObject(tmpDC, oldBmp);\r
  87                 ::DeleteDC(tmpDC);\r
  88 \r
  89                 HBITMAP old = (HBITMAP)::SelectObject(m_hMemoryDC, bmp);\r
  90 \r
  91                 if (old != NULL && old != m_hPaintBitmap)\r
  92                 {\r
  93                         ::DeleteObject(old);\r
  94                 }\r
  95 \r
  96                 if (m_hPaintBitmap != NULL)\r
  97                 {\r
  98                         ::DeleteObject(m_hPaintBitmap);\r
  99                 }\r
 100 \r
 101                 m_hPaintBitmap = bmp;\r
 102 \r
 103                 m_ClientRect = *lpRectBounds;\r
 104                 m_bBoundsUpdated = TRUE;\r
 105         }\r
 106 \r
 107         return CPaintDC::SetBoundsRect(lpRectBounds, flags);\r
 108 }\r
 109 \r
 110 BOOL CBufferDC::RestoreDC( int nSavedDC )\r
 111 {\r
 112         BOOL ret = CPaintDC::RestoreDC(nSavedDC);\r
 113 \r
 114         if (m_bBoundsUpdated)\r
 115         {\r
 116                 SelectObject(m_hPaintBitmap);\r
 117         }\r
 118 \r
 119         return ret;\r
 120 }