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 #endif
  18
  19 #include "wx/os2/private.h"
  20
  21 #include "wx/dcmemory.h"
  22
  23 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
  24
  25 /////////////////////////////////////////////////////////////////////////////
  26 // Memory DC
  27 /////////////////////////////////////////////////////////////////////////////
  28
  29 wxMemoryDC::wxMemoryDC(void)
  30 {
  31     CreateCompatible(NULL);
  32     Init();
  33 } // end of wxMemoryDC::wxMemoryDC
  34
  35 wxMemoryDC::wxMemoryDC(
  36   wxDC*                             pOldDC
  37 )
  38 {
  39     pOldDC->BeginDrawing();
  40     CreateCompatible(pOldDC);
  41     pOldDC->EndDrawing();
  42     Init();
  43 } // end of wxMemoryDC::wxMemoryDC
  44
  45 void wxMemoryDC::Init()
  46 {
  47     if (m_ok)
  48     {
  49         SetBrush(*wxWHITE_BRUSH);
  50         SetPen(*wxBLACK_PEN);
  51
  52         // the background mode is only used for text background and is set in
  53         // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
  54         ::GpiSetBackMix( GetHPS(), BM_LEAVEALONE );
  55     }
  56 } // end of wxMemoryDC::Init
  57
  58 bool wxMemoryDC::CreateCompatible(
  59   wxDC*                             pDC
  60 )
  61 {
  62     HDC                             hDC;
  63     HPS                             hPS;
  64     DEVOPENSTRUC                    vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
  65     SIZEL                           vSize = {0, 0};
  66
  67     //
  68     // Create a memory device context
  69     //
  70     hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
  71     if (hDC != DEV_ERROR)
  72     {
  73         hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
  74         if (hPS != GPI_ERROR)
  75         {
  76             m_hPS = hPS;
  77             m_hDC = hDC;
  78             m_ok = TRUE;
  79             m_bOwnsDC = TRUE;
  80             //
  81             // Set the wxWindows color table
  82             //
  83             ::GpiCreateLogColorTable( m_hPS
  84                                      ,0L
  85                                      ,LCOLF_CONSECRGB
  86                                      ,0L
  87                                      ,(LONG)wxTheColourDatabase->m_nSize
  88                                      ,(PLONG)wxTheColourDatabase->m_palTable
  89                                     );
  90             ::GpiCreateLogColorTable( m_hPS
  91                                      ,0L
  92                                      ,LCOLF_RGB
  93                                      ,0L
  94                                      ,0L
  95                                      ,NULL
  96                                     );
  97         }
  98         else
  99         {
 100             m_hPS = NULLHANDLE;
 101             m_hDC = NULLHANDLE;
 102             m_ok  = FALSE;
 103             m_bOwnsDC = FALSE;
 104         }
 105     }
 106     else
 107     {
 108         m_hPS = NULLHANDLE;
 109         m_hDC = NULLHANDLE;
 110         m_ok  = FALSE;
 111         m_bOwnsDC = FALSE;
 112     }
 113
 114     //
 115     // As we created the DC, we must delete it in the dtor
 116     //
 117     m_bOwnsDC = TRUE;
 118     m_ok = m_hDC != 0;
 119     return m_ok;
 120 } // end of wxMemoryDC::CreateCompatible
 121
 122 void wxMemoryDC::SelectObject(
 123   const wxBitmap&                   rBitmap
 124 )
 125 {
 126     //
 127     // Select old bitmap out of the device context
 128     //
 129     if (m_hOldBitmap)
 130     {
 131         ::GpiSetBitmap(m_hPS, NULLHANDLE);
 132         if (m_vSelectedBitmap.Ok())
 133         {
 134             m_vSelectedBitmap.SetSelectedInto(NULL);
 135             m_vSelectedBitmap = wxNullBitmap;
 136         }
 137     }
 138
 139     //
 140     // Check for whether the bitmap is already selected into a device context
 141     //
 142     wxCHECK_RET( !rBitmap.GetSelectedInto() ||
 143                  (rBitmap.GetSelectedInto() == this),
 144                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 145
 146     m_vSelectedBitmap = rBitmap;
 147
 148     WXHBITMAP                       hBmp = m_vSelectedBitmap.GetHBITMAP();
 149
 150     if (!hBmp)
 151         return;
 152
 153     m_vSelectedBitmap.SetSelectedInto(this);
 154     hBmp = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
 155
 156     if (hBmp == HBM_ERROR)
 157     {
 158         wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
 159         wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
 160     }
 161     else if (!m_hOldBitmap)
 162     {
 163         m_hOldBitmap = hBmp;
 164     }
 165 } // end of wxMemoryDC::SelectObject
 166
 167 void wxMemoryDC::DoGetSize(
 168   int*                              pWidth
 169 , int*                              pHeight
 170 ) const
 171 {
 172     if (!m_vSelectedBitmap.Ok())
 173     {
 174         *pWidth  = 0;
 175         *pHeight = 0;
 176         return;
 177     }
 178     *pWidth = m_vSelectedBitmap.GetWidth();
 179     *pHeight = m_vSelectedBitmap.GetHeight();
 180 } // end of wxMemoryDC::DoGetSize
 181
 182 void wxMemoryDC::DoDrawRectangle(
 183   wxCoord                           vX
 184 , wxCoord                           vY
 185 , wxCoord                           vWidth
 186 , wxCoord                           vHeight
 187 )
 188 {
 189     wxDC::DoDrawRectangle(vX, vY, vWidth, vHeight);
 190 } // end of wxMemoryDC::DoDrawRectangle