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 } // end of wxMemoryDC::Init
  59
  60 bool wxMemoryDC::CreateCompatible(
  61   wxDC*                             pDC
  62 )
  63 {
  64     HDC                             hDC;
  65     HPS                             hPS;
  66     DEVOPENSTRUC                    vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
  67     SIZEL                           vSize = {0, 0};
  68
  69     //
  70     // Create a memory device context
  71     //
  72     hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
  73     if (hDC != DEV_ERROR)
  74     {
  75         hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
  76         if (hPS != GPI_ERROR)
  77         {
  78             m_hPS = hPS;
  79             m_hDC = hDC;
  80             m_ok = TRUE;
  81             m_bOwnsDC = TRUE;
  82             //
  83             // Set the wxWindows color table
  84             //
  85             ::GpiCreateLogColorTable( m_hPS
  86                                      ,0L
  87                                      ,LCOLF_CONSECRGB
  88                                      ,0L
  89                                      ,(LONG)wxTheColourDatabase->m_nSize
  90                                      ,(PLONG)wxTheColourDatabase->m_palTable
  91                                     );
  92             ::GpiCreateLogColorTable( m_hPS
  93                                      ,0L
  94                                      ,LCOLF_RGB
  95                                      ,0L
  96                                      ,0L
  97                                      ,NULL
  98                                     );
  99         }
 100         else
 101         {
 102             m_hPS = NULLHANDLE;
 103             m_hDC = NULLHANDLE;
 104             m_ok  = FALSE;
 105             m_bOwnsDC = FALSE;
 106         }
 107     }
 108     else
 109     {
 110         m_hPS = NULLHANDLE;
 111         m_hDC = NULLHANDLE;
 112         m_ok  = FALSE;
 113         m_bOwnsDC = FALSE;
 114     }
 115
 116     //
 117     // As we created the DC, we must delete it in the dtor
 118     //
 119     m_bOwnsDC = TRUE;
 120     m_ok = m_hDC != 0;
 121     return m_ok;
 122 } // end of wxMemoryDC::CreateCompatible
 123
 124 void wxMemoryDC::SelectObject(
 125   const wxBitmap&                   rBitmap
 126 )
 127 {
 128     //
 129     // Select old bitmap out of the device context
 130     //
 131     if (m_hOldBitmap)
 132     {
 133         ::GpiSetBitmap(m_hPS, NULLHANDLE);
 134         if (m_vSelectedBitmap.Ok())
 135         {
 136             m_vSelectedBitmap.SetSelectedInto(NULL);
 137             m_vSelectedBitmap = wxNullBitmap;
 138         }
 139     }
 140
 141     //
 142     // Check for whether the bitmap is already selected into a device context
 143     //
 144     wxCHECK_RET( !rBitmap.GetSelectedInto() ||
 145                  (rBitmap.GetSelectedInto() == this),
 146                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 147
 148     m_vSelectedBitmap = rBitmap;
 149
 150     WXHBITMAP                       hBmp = m_vSelectedBitmap.GetHBITMAP();
 151
 152     if (!hBmp)
 153         return;
 154
 155     m_vSelectedBitmap.SetSelectedInto(this);
 156     hBmp = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
 157
 158     if (hBmp == HBM_ERROR)
 159     {
 160         wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
 161         wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
 162     }
 163     else if (!m_hOldBitmap)
 164     {
 165         m_hOldBitmap = hBmp;
 166     }
 167 } // end of wxMemoryDC::SelectObject
 168
 169 void wxMemoryDC::DoGetSize(
 170   int*                              pWidth
 171 , int*                              pHeight
 172 ) const
 173 {
 174     if (!m_vSelectedBitmap.Ok())
 175     {
 176         *pWidth  = 0;
 177         *pHeight = 0;
 178         return;
 179     }
 180     *pWidth = m_vSelectedBitmap.GetWidth();
 181     *pHeight = m_vSelectedBitmap.GetHeight();
 182 } // end of wxMemoryDC::DoGetSize
 183
 184 void wxMemoryDC::DoDrawRectangle(
 185   wxCoord                           vX
 186 , wxCoord                           vY
 187 , wxCoord                           vWidth
 188 , wxCoord                           vHeight
 189 )
 190 {
 191     wxDC::DoDrawRectangle(vX, vY, vWidth, vHeight);
 192 } // end of wxMemoryDC::DoDrawRectangle