added missing return on error

[wxWidgets.git] / src / os2 / dcmemory.cpp

diff --git a/src/os2/dcmemory.cpp b/src/os2/dcmemory.cpp
index 7cbd330821f76b4c97a124689b631d859e829e03..a6af12eb9090e97f42e27fc0da6c0d30bccb2915 100644 (file)
--- a/src/os2/dcmemory.cpp
+++ b/src/os2/dcmemory.cpp
@@ -1,64 +1,192 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        dcmemory.cpp
 // Purpose:     wxMemoryDC class
-// Author:      AUTHOR
+// Author:      David Webster
 // Modified by:
-// Created:     01/02/97
+// Created:     10/14/99
 // RCS-ID:      $Id$
-// Copyright:   (c) AUTHOR
-// Licence:    wxWindows licence
+// Copyright:   (c) David Webster
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "dcmemory.h"
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifndef WX_PRECOMP
+#include "wx/utils.h"
+#include "wx/app.h"
+#include "wx/log.h"
 #endif
 
+#include "wx/os2/private.h"
+
 #include "wx/dcmemory.h"
 
-//-----------------------------------------------------------------------------
-// wxMemoryDC
-//-----------------------------------------------------------------------------
+IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
 
-IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC,wxPaintDC)
+/////////////////////////////////////////////////////////////////////////////
+// Memory DC
+/////////////////////////////////////////////////////////////////////////////
 
 wxMemoryDC::wxMemoryDC(void)
 {
-  m_ok = FALSE;
-};
+    CreateCompatible(NULL);
+    Init();
+} // end of wxMemoryDC::wxMemoryDC
 
-wxMemoryDC::wxMemoryDC( wxDC *WXUNUSED(dc) )
+wxMemoryDC::wxMemoryDC(
+  wxDC*                             pOldDC
+)
 {
-  m_ok = FALSE;
-};
+    pOldDC->BeginDrawing();
+    CreateCompatible(pOldDC);
+    pOldDC->EndDrawing();
+    Init();
+} // end of wxMemoryDC::wxMemoryDC
 
-wxMemoryDC::~wxMemoryDC(void)
+void wxMemoryDC::Init()
 {
-};
+    if (m_ok)
+    {
+        SetBrush(*wxWHITE_BRUSH);
+        SetPen(*wxBLACK_PEN);
 
-void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
+        // the background mode is only used for text background and is set in
+        // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
+        ::GpiSetBackMix( GetHPS(), BM_LEAVEALONE );
+    }
+} // end of wxMemoryDC::Init
+
+bool wxMemoryDC::CreateCompatible(
+  wxDC*                             pDC
+)
 {
-  m_selected = bitmap;
-  if (m_selected.Ok())
-  {
-  }
-  else
-  {
-    m_ok = FALSE;
-  };
-};
-
-void wxMemoryDC::GetSize( int *width, int *height ) const
+    HDC                             hDC;
+    HPS                             hPS;
+    DEVOPENSTRUC                    vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
+    SIZEL                           vSize = {0, 0};
+
+    //
+    // Create a memory device context
+    //
+    hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
+    if (hDC != DEV_ERROR)
+    {
+        hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
+        if (hPS != GPI_ERROR)
+        {
+            m_hPS = hPS;
+            m_hDC = hDC;
+            m_ok = TRUE;
+            m_bOwnsDC = TRUE;
+            //
+            // Set the wxWindows color table
+            //
+            ::GpiCreateLogColorTable( m_hPS
+                                     ,0L
+                                     ,LCOLF_CONSECRGB
+                                     ,0L
+                                     ,(LONG)wxTheColourDatabase->m_nSize
+                                     ,(PLONG)wxTheColourDatabase->m_palTable
+                                    );
+            ::GpiCreateLogColorTable( m_hPS
+                                     ,0L
+                                     ,LCOLF_RGB
+                                     ,0L
+                                     ,0L
+                                     ,NULL
+                                    );
+        }
+        else
+        {
+            m_hPS = NULLHANDLE;
+            m_hDC = NULLHANDLE;
+            m_ok  = FALSE;
+            m_bOwnsDC = FALSE;
+        }
+    }
+    else
+    {
+        m_hPS = NULLHANDLE;
+        m_hDC = NULLHANDLE;
+        m_ok  = FALSE;
+        m_bOwnsDC = FALSE;
+    }
+
+    //
+    // As we created the DC, we must delete it in the dtor
+    //
+    m_bOwnsDC = TRUE;
+    m_ok = m_hDC != 0;
+    return m_ok;
+} // end of wxMemoryDC::CreateCompatible
+
+void wxMemoryDC::SelectObject(
+  const wxBitmap&                   rBitmap
+)
 {
-  if (m_selected.Ok())
-  {
-    if (width) (*width) = m_selected.GetWidth();
-    if (height) (*height) = m_selected.GetHeight();
-  }
-  else
-  {
-    if (width) (*width) = 0;
-    if (height) (*height) = 0;
-  };
-};
+    //
+    // Select old bitmap out of the device context
+    //
+    if (m_hOldBitmap)
+    {
+        ::GpiSetBitmap(m_hPS, NULLHANDLE);
+        if (m_vSelectedBitmap.Ok())
+        {
+            m_vSelectedBitmap.SetSelectedInto(NULL);
+            m_vSelectedBitmap = wxNullBitmap;
+        }
+    }
 
+    //
+    // Check for whether the bitmap is already selected into a device context
+    //
+    wxCHECK_RET( !rBitmap.GetSelectedInto() ||
+                 (rBitmap.GetSelectedInto() == this),
+                 wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 
+    m_vSelectedBitmap = rBitmap;
+
+    WXHBITMAP                       hBmp = m_vSelectedBitmap.GetHBITMAP();
+
+    if (!hBmp)
+        return;
+
+    m_vSelectedBitmap.SetSelectedInto(this);
+    hBmp = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
+
+    if (hBmp == HBM_ERROR)
+    {
+        wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
+        wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
+    }
+    else if (!m_hOldBitmap)
+    {
+        m_hOldBitmap = hBmp;
+    }
+} // end of wxMemoryDC::SelectObject
+
+void wxMemoryDC::DoGetSize(
+  int*                              pWidth
+, int*                              pHeight
+) const
+{
+    if (!m_vSelectedBitmap.Ok())
+    {
+        *pWidth  = 0;
+        *pHeight = 0;
+        return;
+    }
+    *pWidth = m_vSelectedBitmap.GetWidth();
+    *pHeight = m_vSelectedBitmap.GetHeight();
+} // end of wxMemoryDC::DoGetSize
+
+void wxMemoryDC::DoDrawRectangle(
+  wxCoord                           vX
+, wxCoord                           vY
+, wxCoord                           vWidth
+, wxCoord                           vHeight
+)
+{
+    wxDC::DoDrawRectangle(vX, vY, vWidth, vHeight);
+} // end of wxMemoryDC::DoDrawRectangle