X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ad81651f00edc6f489d9b6a0839d316a964fd521..e031f1df56a1595c7ebb4027eb89bf1c9f286bdf:/src/msw/dcmemory.cpp

diff --git a/src/msw/dcmemory.cpp b/src/msw/dcmemory.cpp
index 1a59e06627..e68fe93b10 100644
--- a/src/msw/dcmemory.cpp
+++ b/src/msw/dcmemory.cpp
@@ -1,11 +1,11 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        dcmemory.cpp
+// Name:        src/msw/dcmemory.cpp
 // Purpose:     wxMemoryDC class
 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart and Markus Holzem
+// Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -17,10 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#ifdef __GNUG__
-    #pragma implementation "dcmemory.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -28,6 +24,8 @@
     #pragma hdrstop
 #endif
 
+#include "wx/dcmemory.h"
+
 #ifndef WX_PRECOMP
     #include "wx/utils.h"
     #include "wx/log.h"
@@ -35,13 +33,11 @@
 
 #include "wx/msw/private.h"
 
-#include "wx/dcmemory.h"
-
 // ----------------------------------------------------------------------------
 // wxWin macros
 // ----------------------------------------------------------------------------
 
-    IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
+IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
 
 // ============================================================================
 // implementation
@@ -53,37 +49,43 @@
 
 wxMemoryDC::wxMemoryDC()
 {
-    m_hDC = (WXHDC) ::CreateCompatibleDC((HDC) NULL);
-    m_ok = (m_hDC != 0);
-    m_bOwnsDC = TRUE;
-
-    SetBrush(*wxWHITE_BRUSH);
-    SetPen(*wxBLACK_PEN);
+    CreateCompatible(NULL);
 
-    // the background mode is only used for text background and is set in
-    // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
-    ::SetBkMode( GetHdc(), TRANSPARENT );
+    Init();
 }
 
-wxMemoryDC::wxMemoryDC(wxDC *old_dc)
+wxMemoryDC::wxMemoryDC(wxDC *dc)
 {
-    old_dc->BeginDrawing();
+    wxCHECK_RET( dc, _T("NULL dc in wxMemoryDC ctor") );
 
-    m_hDC = (WXHDC) ::CreateCompatibleDC(GetHdcOf(*old_dc));
-    m_ok = (m_hDC != 0);
+    CreateCompatible(dc);
 
-    old_dc->EndDrawing();
+    Init();
+}
 
-    SetBrush(*wxWHITE_BRUSH);
-    SetPen(*wxBLACK_PEN);
+void wxMemoryDC::Init()
+{
+    if ( m_ok )
+    {
+        SetBrush(*wxWHITE_BRUSH);
+        SetPen(*wxBLACK_PEN);
 
-    // the background mode is only used for text background and is set in
-    // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
-    ::SetBkMode( GetHdc(), TRANSPARENT );
+        // the background mode is only used for text background and is set in
+        // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
+        ::SetBkMode( GetHdc(), TRANSPARENT );
+    }
 }
 
-wxMemoryDC::~wxMemoryDC()
+bool wxMemoryDC::CreateCompatible(wxDC *dc)
 {
+    m_hDC = (WXHDC)::CreateCompatibleDC(dc ? GetHdcOf(*dc) : NULL);
+
+    // as we created the DC, we must delete it in the dtor
+    m_bOwnsDC = true;
+
+    m_ok = m_hDC != 0;
+
+    return m_ok;
 }
 
 void wxMemoryDC::SelectObject(const wxBitmap& bitmap)
@@ -94,28 +96,31 @@ void wxMemoryDC::SelectObject(const wxBitmap& bitmap)
         ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
         if ( m_selectedBitmap.Ok() )
         {
+#ifdef __WXDEBUG__
             m_selectedBitmap.SetSelectedInto(NULL);
+#endif
             m_selectedBitmap = wxNullBitmap;
         }
     }
 
     // check for whether the bitmap is already selected into a device context
-    wxCHECK_RET( !bitmap.GetSelectedInto() ||
-                 (bitmap.GetSelectedInto() == this),
-                 wxT("Bitmap is selected in another wxMemoryDC, delete the "
-                     "first wxMemoryDC or use SelectObject(NULL)") );
+    wxASSERT_MSG( !bitmap.GetSelectedInto() ||
+                  (bitmap.GetSelectedInto() == this),
+                  wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 
     m_selectedBitmap = bitmap;
     WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP();
     if ( !hBmp )
         return;
 
+#ifdef __WXDEBUG__
     m_selectedBitmap.SetSelectedInto(this);
+#endif
     hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);
 
     if ( !hBmp )
     {
-        wxLogLastError("SelectObject(memDC, bitmap)");
+        wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
 
         wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
     }
@@ -139,3 +144,58 @@ void wxMemoryDC::DoGetSize(int *width, int *height) const
     }
 }
 
+// the rest of this file deals with drawing rectangles workaround, disabled by
+// default
+
+#define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0
+
+#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
+
+// For some reason, drawing a rectangle on a memory DC has problems.
+// Use this substitute if we can.
+static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height)
+{
+    wxBrush brush(dc.GetBrush());
+    wxPen pen(dc.GetPen());
+    if (brush.Ok() && brush.GetStyle() != wxTRANSPARENT)
+    {
+        HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ;
+        if (hBrush)
+        {
+            RECT rect;
+            rect.left = x; rect.top = y;
+            rect.right = x + width - 1;
+            rect.bottom = y + height - 1;
+            ::FillRect((HDC) dc.GetHDC(), &rect, hBrush);
+        }
+    }
+    width --; height --;
+    if (pen.Ok() && pen.GetStyle() != wxTRANSPARENT)
+    {
+        dc.DrawLine(x, y, x + width, y);
+        dc.DrawLine(x, y, x, y + height);
+        dc.DrawLine(x, y+height, x+width, y + height);
+        dc.DrawLine(x+width, y+height, x+width, y);
+    }
+}
+
+#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
+
+void wxMemoryDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
+{
+    // Set this to 1 to work around an apparent video driver bug
+    // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample)
+#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
+    if (m_brush.Ok() && m_pen.Ok() &&
+        (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) &&
+        (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) &&
+        (GetLogicalFunction() == wxCOPY))
+    {
+        wxDrawRectangle(* this, x, y, width, height);
+    }
+    else
+#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
+    {
+        wxDC::DoDrawRectangle(x, y, width, height);
+    }
+}