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( wxDC* WXUNUSED(pDC) )
  62 {
  63     HDC           hDC;
  64     HPS           hPS;
  65     DEVOPENSTRUC  vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
  66     SIZEL         vSize = {0, 0};
  67
  68     //
  69     // Create a memory device context
  70     //
  71     hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
  72     if (hDC != DEV_ERROR)
  73     {
  74         hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
  75         if (hPS != GPI_ERROR)
  76         {
  77             m_hPS = hPS;
  78             m_hDC = hDC;
  79             m_ok = true;
  80             m_bOwnsDC = true;
  81             //
  82             // Set the wxWidgets color table
  83             //
  84             ::GpiCreateLogColorTable( m_hPS
  85                                      ,0L
  86                                      ,LCOLF_CONSECRGB
  87                                      ,0L
  88                                      ,(LONG)wxTheColourDatabase->m_nSize
  89                                      ,(PLONG)wxTheColourDatabase->m_palTable
  90                                     );
  91             ::GpiCreateLogColorTable( m_hPS
  92                                      ,0L
  93                                      ,LCOLF_RGB
  94                                      ,0L
  95                                      ,0L
  96                                      ,NULL
  97                                     );
  98         }
  99         else
 100         {
 101             m_hPS = NULLHANDLE;
 102             m_hDC = NULLHANDLE;
 103             m_ok  = FALSE;
 104             m_bOwnsDC = FALSE;
 105         }
 106     }
 107     else
 108     {
 109         m_hPS = NULLHANDLE;
 110         m_hDC = NULLHANDLE;
 111         m_ok  = FALSE;
 112         m_bOwnsDC = FALSE;
 113     }
 114
 115     //
 116     // As we created the DC, we must delete it in the dtor
 117     //
 118     m_bOwnsDC = true;
 119     m_ok = m_hDC != 0;
 120     return m_ok;
 121 } // end of wxMemoryDC::CreateCompatible
 122
 123 void wxMemoryDC::SelectObject(
 124   const wxBitmap&                   rBitmap
 125 )
 126 {
 127     //
 128     // Select old bitmap out of the device context
 129     //
 130     if (m_hOldBitmap)
 131     {
 132         ::GpiSetBitmap(m_hPS, NULLHANDLE);
 133         if (m_vSelectedBitmap.Ok())
 134         {
 135             m_vSelectedBitmap.SetSelectedInto(NULL);
 136             m_vSelectedBitmap = wxNullBitmap;
 137         }
 138     }
 139
 140     //
 141     // Check for whether the bitmap is already selected into a device context
 142     //
 143     wxCHECK_RET( !rBitmap.GetSelectedInto() ||
 144                  (rBitmap.GetSelectedInto() == this),
 145                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 146
 147     WXHBITMAP                       hBmp = rBitmap.GetHBITMAP();
 148
 149     if (!hBmp)
 150     {
 151         //
 152         // Bmps drawn to are upside down, so flip it before committing
 153         //
 154         POINTL                      vPoint[4] = { {0, m_vSelectedBitmap.GetHeight()}
 155                                                  ,{m_vSelectedBitmap.GetWidth(), 0}
 156                                                  ,{0, 0}
 157                                                  ,{m_vSelectedBitmap.GetWidth(), m_vSelectedBitmap.GetHeight()}
 158                                                 };
 159
 160
 161         ::GpiBitBlt( m_hPS
 162                     ,m_hPS
 163                     ,4
 164                     ,vPoint
 165                     ,ROP_SRCCOPY
 166                     ,BBO_IGNORE
 167                    );
 168         m_vSelectedBitmap.SetSelectedInto(NULL);
 169     }
 170     m_vSelectedBitmap = rBitmap;
 171
 172
 173     if (!hBmp)
 174     {
 175
 176         m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, NULLHANDLE);
 177         return;
 178     }
 179     m_vSelectedBitmap.SetSelectedInto(this);
 180     m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
 181
 182     if (m_hOldBitmap == HBM_ERROR)
 183     {
 184         wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
 185         wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
 186     }
 187 } // end of wxMemoryDC::SelectObject
 188
 189 void wxMemoryDC::DoGetSize(
 190   int*                              pWidth
 191 , int*                              pHeight
 192 ) const
 193 {
 194     if (!m_vSelectedBitmap.Ok())
 195     {
 196         *pWidth  = 0;
 197         *pHeight = 0;
 198         return;
 199     }
 200     *pWidth = m_vSelectedBitmap.GetWidth();
 201     *pHeight = m_vSelectedBitmap.GetHeight();
 202 } // end of wxMemoryDC::DoGetSize