src/os2/dcmemory.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcmemory.cpp
   3 // Purpose:     wxMemoryDC class
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     10/14/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Webster
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifndef WX_PRECOMP
  16 #include "wx/utils.h"
  17 #include "wx/app.h"
  18 #include "wx/log.h"
  19 #endif
  20
  21 #include "wx/os2/private.h"
  22
  23 #include "wx/dcmemory.h"
  24
  25 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
  26
  27 /////////////////////////////////////////////////////////////////////////////
  28 // Memory DC
  29 /////////////////////////////////////////////////////////////////////////////
  30
  31 wxMemoryDC::wxMemoryDC(void)
  32 {
  33     CreateCompatible(NULL);
  34     Init();
  35 } // end of wxMemoryDC::wxMemoryDC
  36
  37 wxMemoryDC::wxMemoryDC(
  38   wxDC*                             pOldDC
  39 )
  40 {
  41     pOldDC->BeginDrawing();
  42     CreateCompatible(pOldDC);
  43     pOldDC->EndDrawing();
  44     Init();
  45 } // end of wxMemoryDC::wxMemoryDC
  46
  47 void wxMemoryDC::Init()
  48 {
  49     if (m_ok)
  50     {
  51         SetBrush(*wxWHITE_BRUSH);
  52         SetPen(*wxBLACK_PEN);
  53
  54         // the background mode is only used for text background and is set in
  55         // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
  56         ::GpiSetBackMix( GetHPS(), BM_LEAVEALONE );
  57     }
  58     memset(&m_vRclPaint, 0, sizeof(m_vRclPaint));
  59 } // end of wxMemoryDC::Init
  60
  61 bool wxMemoryDC::CreateCompatible(
  62   wxDC*                             pDC
  63 )
  64 {
  65     HDC                             hDC;
  66     HPS                             hPS;
  67     DEVOPENSTRUC                    vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
  68     SIZEL                           vSize = {0, 0};
  69
  70     //
  71     // Create a memory device context
  72     //
  73     hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
  74     if (hDC != DEV_ERROR)
  75     {
  76         hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
  77         if (hPS != GPI_ERROR)
  78         {
  79             m_hPS = hPS;
  80             m_hDC = hDC;
  81             m_ok = TRUE;
  82             m_bOwnsDC = TRUE;
  83             //
  84             // Set the wxWindows color table
  85             //
  86             ::GpiCreateLogColorTable( m_hPS
  87                                      ,0L
  88                                      ,LCOLF_CONSECRGB
  89                                      ,0L
  90                                      ,(LONG)wxTheColourDatabase->m_nSize
  91                                      ,(PLONG)wxTheColourDatabase->m_palTable
  92                                     );
  93             ::GpiCreateLogColorTable( m_hPS
  94                                      ,0L
  95                                      ,LCOLF_RGB
  96                                      ,0L
  97                                      ,0L
  98                                      ,NULL
  99                                     );
 100         }
 101         else
 102         {
 103             m_hPS = NULLHANDLE;
 104             m_hDC = NULLHANDLE;
 105             m_ok  = FALSE;
 106             m_bOwnsDC = FALSE;
 107         }
 108     }
 109     else
 110     {
 111         m_hPS = NULLHANDLE;
 112         m_hDC = NULLHANDLE;
 113         m_ok  = FALSE;
 114         m_bOwnsDC = FALSE;
 115     }
 116
 117     //
 118     // As we created the DC, we must delete it in the dtor
 119     //
 120     m_bOwnsDC = TRUE;
 121     m_ok = m_hDC != 0;
 122     return m_ok;
 123 } // end of wxMemoryDC::CreateCompatible
 124
 125 void wxMemoryDC::SelectObject(
 126   const wxBitmap&                   rBitmap
 127 )
 128 {
 129     //
 130     // Select old bitmap out of the device context
 131     //
 132     if (m_hOldBitmap)
 133     {
 134         ::GpiSetBitmap(m_hPS, NULLHANDLE);
 135         if (m_vSelectedBitmap.Ok())
 136         {
 137             m_vSelectedBitmap.SetSelectedInto(NULL);
 138             m_vSelectedBitmap = wxNullBitmap;
 139         }
 140     }
 141
 142     //
 143     // Check for whether the bitmap is already selected into a device context
 144     //
 145     wxCHECK_RET( !rBitmap.GetSelectedInto() ||
 146                  (rBitmap.GetSelectedInto() == this),
 147                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 148
 149     WXHBITMAP                       hBmp = rBitmap.GetHBITMAP();
 150
 151     if (!hBmp)
 152     {
 153         m_vSelectedBitmap.SetSelectedInto(NULL);
 154     }
 155     m_vSelectedBitmap = rBitmap;
 156
 157
 158     if (!hBmp)
 159     {
 160         m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, NULLHANDLE);
 161         return;
 162     }
 163     m_vSelectedBitmap.SetSelectedInto(this);
 164     m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
 165
 166     if (m_hOldBitmap == HBM_ERROR)
 167     {
 168         wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
 169         wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
 170     }
 171 } // end of wxMemoryDC::SelectObject
 172
 173 void wxMemoryDC::DoGetSize(
 174   int*                              pWidth
 175 , int*                              pHeight
 176 ) const
 177 {
 178     if (!m_vSelectedBitmap.Ok())
 179     {
 180         *pWidth  = 0;
 181         *pHeight = 0;
 182         return;
 183     }
 184     *pWidth = m_vSelectedBitmap.GetWidth();
 185     *pHeight = m_vSelectedBitmap.GetHeight();
 186 } // end of wxMemoryDC::DoGetSize
 187