Some improvements to accessibility behaviour

[wxWidgets.git] / src / msw / dc.cpp

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index edd4fe4fa5679f7236fcb61f7eb32c4504bcd8d3..8a05efa95c76f6b68e7d0206eff9e4e6c8ea2ba5 100644 (file)
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -40,14 +40,16 @@
     #include "wx/icon.h"
 #endif
 
     #include "wx/icon.h"
 #endif
 

+#include "wx/sysopt.h"

 #include "wx/dcprint.h"
 #include "wx/dcprint.h"

+#include "wx/module.h"

 
 #include <string.h>
 #include <math.h>
 
 #include "wx/msw/private.h" // needs to be before #include <commdlg.h>
 
 
 #include <string.h>
 #include <math.h>
 
 #include "wx/msw/private.h" // needs to be before #include <commdlg.h>
 

-#if wxUSE_COMMON_DIALOGS
+#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)

     #include <commdlg.h>
 #endif
 
     #include <commdlg.h>
 #endif
 


@@ -55,6 +57,11 @@
     #include <print.h>
 #endif
 
     #include <print.h>
 #endif
 

+/* Quaternary raster codes */
+#ifndef MAKEROP4
+#define MAKEROP4(fore,back) (DWORD)((((back) << 8) & 0xFF000000) | (fore))
+#endif
+

 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
 
 // ---------------------------------------------------------------------------
 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxDCBase)
 
 // ---------------------------------------------------------------------------


@@ -75,6 +82,25 @@ static const int MM_METRIC = 10;
 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
 #define DSTCOPY 0x00AA0029      // a.k.a. NOP operation
 
 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
 #define DSTCOPY 0x00AA0029      // a.k.a. NOP operation
 

+// ----------------------------------------------------------------------------
+// macros for logical <-> device coords conversion
+// ----------------------------------------------------------------------------
+
+/*
+   We currently let Windows do all the translations itself so these macros are
+   not really needed (any more) but keep them to enhance readability of the
+   code by allowing to see where are the logical and where are the device
+   coordinates used.
+ */
+
+// logical to device
+#define XLOG2DEV(x) (x)
+#define YLOG2DEV(y) (y)
+
+// device to logical
+#define XDEV2LOG(x) (x)
+#define YDEV2LOG(y) (y)
+

 // ---------------------------------------------------------------------------
 // private functions
 // ---------------------------------------------------------------------------
 // ---------------------------------------------------------------------------
 // private functions
 // ---------------------------------------------------------------------------


@@ -106,6 +132,30 @@ private:
     bool m_changed;
 };
 
     bool m_changed;
 };
 

+// this class saves the old stretch blit mode during its life time
+class StretchBltModeChanger
+{
+public:
+    StretchBltModeChanger(HDC hdc, int mode)
+        : m_hdc(hdc)
+    {
+        m_modeOld = ::SetStretchBltMode(m_hdc, mode);
+        if ( !m_modeOld )
+            wxLogLastError(_T("SetStretchBltMode"));
+    }
+
+    ~StretchBltModeChanger()
+    {
+        if ( !::SetStretchBltMode(m_hdc, m_modeOld) )
+            wxLogLastError(_T("SetStretchBltMode"));
+    }
+
+private:
+    const HDC m_hdc;
+
+    int m_modeOld;
+};
+

 // ===========================================================================
 // implementation
 // ===========================================================================
 // ===========================================================================
 // implementation
 // ===========================================================================


@@ -116,7 +166,8 @@ private:
 
 wxColourChanger::wxColourChanger(wxDC& dc) : m_dc(dc)
 {
 
 wxColourChanger::wxColourChanger(wxDC& dc) : m_dc(dc)
 {

-    if ( dc.GetBrush().GetStyle() == wxSTIPPLE_MASK_OPAQUE )
+    const wxBrush& brush = dc.GetBrush();
+    if ( brush.Ok() && brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )

     {
         HDC hdc = GetHdcOf(dc);
         m_colFgOld = ::GetTextColor(hdc);
     {
         HDC hdc = GetHdcOf(dc);
         m_colFgOld = ::GetTextColor(hdc);


@@ -176,16 +227,14 @@ wxDC::wxDC()
     m_oldPen = 0;
     m_oldBrush = 0;
     m_oldFont = 0;
     m_oldPen = 0;
     m_oldBrush = 0;
     m_oldFont = 0;

+#if wxUSE_PALETTE

     m_oldPalette = 0;
     m_oldPalette = 0;

+#endif // wxUSE_PALETTE

 
     m_bOwnsDC = FALSE;
     m_hDC = 0;
 
     m_bOwnsDC = FALSE;
     m_hDC = 0;

-
-    m_windowExtX = VIEWPORT_EXTENT;
-    m_windowExtY = VIEWPORT_EXTENT;

 }
 
 }
 

-

 wxDC::~wxDC()
 {
     if ( m_hDC != 0 )
 wxDC::~wxDC()
 {
     if ( m_hDC != 0 )


@@ -244,16 +293,21 @@ void wxDC::SelectOldObjects(WXHDC dc)
             ::SelectObject((HDC) dc, (HFONT) m_oldFont);
         }
         m_oldFont = 0;
             ::SelectObject((HDC) dc, (HFONT) m_oldFont);
         }
         m_oldFont = 0;

+
+#if wxUSE_PALETTE

         if (m_oldPalette)
         {
         if (m_oldPalette)
         {

-            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
+            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, FALSE);

         }
         m_oldPalette = 0;
         }
         m_oldPalette = 0;

+#endif // wxUSE_PALETTE

     }
 
     m_brush = wxNullBrush;
     m_pen = wxNullPen;
     }
 
     m_brush = wxNullBrush;
     m_pen = wxNullPen;

+#if wxUSE_PALETTE

     m_palette = wxNullPalette;
     m_palette = wxNullPalette;

+#endif // wxUSE_PALETTE

     m_font = wxNullFont;
     m_backgroundBrush = wxNullBrush;
     m_selectedBitmap = wxNullBitmap;
     m_font = wxNullFont;
     m_backgroundBrush = wxNullBrush;
     m_selectedBitmap = wxNullBitmap;


@@ -263,65 +317,107 @@ void wxDC::SelectOldObjects(WXHDC dc)
 // clipping
 // ---------------------------------------------------------------------------
 
 // clipping
 // ---------------------------------------------------------------------------
 

-#define DO_SET_CLIPPING_BOX()                   \
-{                                               \
-    RECT rect;                                  \
-                                                \
-    GetClipBox(GetHdc(), &rect);                \
-                                                \
-    m_clipX1 = (wxCoord) XDEV2LOG(rect.left);   \
-    m_clipY1 = (wxCoord) YDEV2LOG(rect.top);    \
-    m_clipX2 = (wxCoord) XDEV2LOG(rect.right);  \
-    m_clipY2 = (wxCoord) YDEV2LOG(rect.bottom); \
+void wxDC::UpdateClipBox()
+{
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    RECT rect;
+    ::GetClipBox(GetHdc(), &rect);
+
+    m_clipX1 = (wxCoord) XDEV2LOG(rect.left);
+    m_clipY1 = (wxCoord) YDEV2LOG(rect.top);
+    m_clipX2 = (wxCoord) XDEV2LOG(rect.right);
+    m_clipY2 = (wxCoord) YDEV2LOG(rect.bottom);

 }
 
 }
 

-void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
+// common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
+void wxDC::SetClippingHrgn(WXHRGN hrgn)

 {
 {

+    wxCHECK_RET( hrgn, wxT("invalid clipping region") );
+
+#ifdef __WXMICROWIN__
+    if (!GetHdc()) return;
+#endif // __WXMICROWIN__
+
+    // note that we combine the new clipping region with the existing one: this
+    // is compatible with what the other ports do and is the documented
+    // behaviour now (starting with 2.3.3)
+#ifdef __WIN16__
+    RECT rectClip;
+    if ( !::GetClipBox(GetHdc(), &rectClip) )
+        return;
+
+    HRGN hrgnDest = ::CreateRectRgn(0, 0, 0, 0);
+    HRGN hrgnClipOld = ::CreateRectRgn(rectClip.left, rectClip.top,
+                                       rectClip.right, rectClip.bottom);
+
+    if ( ::CombineRgn(hrgnDest, hrgnClipOld, (HRGN)hrgn, RGN_AND) != ERROR )
+    {
+        ::SelectClipRgn(GetHdc(), hrgnDest);
+    }
+
+    ::DeleteObject(hrgnClipOld);
+    ::DeleteObject(hrgnDest);
+#else // Win32
+    if ( ::ExtSelectClipRgn(GetHdc(), (HRGN)hrgn, RGN_AND) == ERROR )
+    {
+        wxLogLastError(_T("ExtSelectClipRgn"));
+
+        return;
+    }
+#endif // Win16/32
+

     m_clipping = TRUE;
 
     m_clipping = TRUE;
 

-    HRGN hrgn = ::CreateRectRgn(XLOG2DEV(cx), YLOG2DEV(cy),
-                                XLOG2DEV(cx + cw), YLOG2DEV(cy + ch));
+    UpdateClipBox();
+}
+
+void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
+{
+    // the region coords are always the device ones, so do the translation
+    // manually
+    //
+    // FIXME: possible +/-1 error here, to check!
+    HRGN hrgn = ::CreateRectRgn(LogicalToDeviceX(x),
+                                LogicalToDeviceY(y),
+                                LogicalToDeviceX(x + w),
+                                LogicalToDeviceY(y + h));

     if ( !hrgn )
     {
         wxLogLastError(_T("CreateRectRgn"));
     }
     else
     {
     if ( !hrgn )
     {
         wxLogLastError(_T("CreateRectRgn"));
     }
     else
     {

-        if ( ::SelectClipRgn(GetHdc(), hrgn) == ERROR )
-        {
-            wxLogLastError(_T("SelectClipRgn"));
-        }
+        SetClippingHrgn((WXHRGN)hrgn);

 
 

-        DO_SET_CLIPPING_BOX()
+        ::DeleteObject(hrgn);

     }
 }
 
 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 {
     }
 }
 
 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 {

-    wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
-
-    m_clipping = TRUE;
-
-#ifdef __WIN16__
-    SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
-#else
-    ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
-#endif
-
-    DO_SET_CLIPPING_BOX()
+    SetClippingHrgn(region.GetHRGN());

 }
 
 void wxDC::DestroyClippingRegion()
 {
 }
 
 void wxDC::DestroyClippingRegion()
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     if (m_clipping && m_hDC)
     {
         // TODO: this should restore the previous clipping region,
     if (m_clipping && m_hDC)
     {
         // TODO: this should restore the previous clipping region,

-        // so that OnPaint processing works correctly, and the update clipping region
-        // doesn't get destroyed after the first DestroyClippingRegion.
+        //       so that OnPaint processing works correctly, and the update
+        //       clipping region doesn't get destroyed after the first
+        //       DestroyClippingRegion.

         HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
         HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);

-        SelectClipRgn(GetHdc(), rgn);
-        DeleteObject(rgn);
+        ::SelectClipRgn(GetHdc(), rgn);
+        ::DeleteObject(rgn);

     }
     }

+

     m_clipping = FALSE;
 }
 
     m_clipping = FALSE;
 }
 


@@ -336,14 +432,23 @@ bool wxDC::CanDrawBitmap() const
 
 bool wxDC::CanGetTextExtent() const
 {
 
 bool wxDC::CanGetTextExtent() const
 {

+#ifdef __WXMICROWIN__
+    // TODO Extend MicroWindows' GetDeviceCaps function
+    return TRUE;
+#else

     // What sort of display is it?
     int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
 
     return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
     // What sort of display is it?
     int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
 
     return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);

+#endif

 }
 
 int wxDC::GetDepth() const
 {
 }
 
 int wxDC::GetDepth() const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 16;
+#endif
+

     return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
 }
 
     return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
 }
 


@@ -353,6 +458,10 @@ int wxDC::GetDepth() const
 
 void wxDC::Clear()
 {
 
 void wxDC::Clear()
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     RECT rect;
     if ( m_canvas )
     {
     RECT rect;
     if ( m_canvas )
     {


@@ -373,24 +482,32 @@ void wxDC::Clear()
 
     (void) ::SetMapMode(GetHdc(), MM_TEXT);
 
 
     (void) ::SetMapMode(GetHdc(), MM_TEXT);
 

-    DWORD colour = GetBkColor(GetHdc());
-    HBRUSH brush = CreateSolidBrush(colour);
-    FillRect(GetHdc(), &rect, brush);
-    DeleteObject(brush);
+    DWORD colour = ::GetBkColor(GetHdc());
+    HBRUSH brush = ::CreateSolidBrush(colour);
+    ::FillRect(GetHdc(), &rect, brush);
+    ::DeleteObject(brush);
+
+    int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX,
+        height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY;

 
     ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
     ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
 
     ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
     ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);

-    ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
+    ::SetWindowExtEx(GetHdc(), width, height, NULL);

     ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
     ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
 }
 
     ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
     ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
 }
 

-void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
+bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)

 {
 {

-    if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return FALSE;
+#endif
+
+    bool success = (0 != ::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),

                          col.GetPixel(),
                          style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
                          col.GetPixel(),
                          style == wxFLOOD_SURFACE ? FLOODFILLSURFACE

-                                                  : FLOODFILLBORDER) )
+                                                  : FLOODFILLBORDER) ) ;
+    if (!success)

     {
         // quoting from the MSDN docs:
         //
     {
         // quoting from the MSDN docs:
         //


@@ -408,10 +525,16 @@ void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
     }
 
     CalcBoundingBox(x, y);
     }
 
     CalcBoundingBox(x, y);

+    
+    return success;

 }
 
 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 {
 }
 
 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return FALSE;
+#endif
+

     wxCHECK_MSG( col, FALSE, _T("NULL colour parameter in wxDC::GetPixel") );
 
     // get the color of the pixel
     wxCHECK_MSG( col, FALSE, _T("NULL colour parameter in wxDC::GetPixel") );
 
     // get the color of the pixel


@@ -424,6 +547,10 @@ bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 
 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 {
 
 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxCoord x1 = x-VIEWPORT_EXTENT;
     wxCoord y1 = y-VIEWPORT_EXTENT;
     wxCoord x2 = x+VIEWPORT_EXTENT;
     wxCoord x1 = x-VIEWPORT_EXTENT;
     wxCoord y1 = y-VIEWPORT_EXTENT;
     wxCoord x2 = x+VIEWPORT_EXTENT;


@@ -441,13 +568,13 @@ void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 
 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 {
 
 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
     (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
 
     (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
     (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
 

-    // Normalization: Windows doesn't draw the last point of the line.
-    // But apparently neither does GTK+, so we take it out again.
-//    (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
-

     CalcBoundingBox(x1, y1);
     CalcBoundingBox(x2, y2);
 }
     CalcBoundingBox(x1, y1);
     CalcBoundingBox(x2, y2);
 }


@@ -458,6 +585,10 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
                      wxCoord x2, wxCoord y2,
                      wxCoord xc, wxCoord yc)
 {
                      wxCoord x2, wxCoord y2,
                      wxCoord xc, wxCoord yc)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     double dx = xc - x1;
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     double dx = xc - x1;


@@ -506,10 +637,14 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
 void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
                            wxCoord width, wxCoord height)
 {
 void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
                            wxCoord width, wxCoord height)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxCoord x2 = x1 + width,
             y2 = y1 + height;
 
     wxCoord x2 = x1 + width,
             y2 = y1 + height;
 

-#if defined(__WIN32__) && !defined(__SC__)
+#if defined(__WIN32__) && !defined(__SC__) && !defined(__WXMICROWIN__)

     RECT rect;
     rect.left   = x1;
     rect.top    = y1;
     RECT rect;
     rect.left   = x1;
     rect.top    = y1;


@@ -525,9 +660,9 @@ void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
     HPEN hBrushOld = (HPEN)::SelectObject(GetHdc(), whiteBrush);
     ::SetROP2(GetHdc(), R2_COPYPEN);
     Rectangle(GetHdc(), x1, y1, x2, y2);
     HPEN hBrushOld = (HPEN)::SelectObject(GetHdc(), whiteBrush);
     ::SetROP2(GetHdc(), R2_COPYPEN);
     Rectangle(GetHdc(), x1, y1, x2, y2);

-    MoveTo(GetHdc(), x1, y1);
+    MoveToEx(GetHdc(), x1, y1, NULL);

     LineTo(GetHdc(), x2, y2);
     LineTo(GetHdc(), x2, y2);

-    MoveTo(GetHdc(), x2, y1);
+    MoveToEx(GetHdc(), x2, y1, NULL);

     LineTo(GetHdc(), x1, y2);
     ::SelectObject(GetHdc(), hPenOld);
     ::SelectObject(GetHdc(), hBrushOld);
     LineTo(GetHdc(), x1, y2);
     ::SelectObject(GetHdc(), hPenOld);
     ::SelectObject(GetHdc(), hBrushOld);


@@ -540,6 +675,10 @@ void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
 
 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 {
 
 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     COLORREF color = 0x00ffffff;
     if (m_pen.Ok())
     {
     COLORREF color = 0x00ffffff;
     if (m_pen.Ok())
     {


@@ -553,6 +692,10 @@ void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 
 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
 {
 
 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Do things less efficiently if we have offsets
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Do things less efficiently if we have offsets


@@ -586,6 +729,10 @@ void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffs
 
 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
 {
 
 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // Do things less efficiently if we have offsets
     if (xoffset != 0 || yoffset != 0)
     {
     // Do things less efficiently if we have offsets
     if (xoffset != 0 || yoffset != 0)
     {


@@ -613,6 +760,10 @@ void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset
 
 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {
 
 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + width;
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + width;


@@ -650,6 +801,10 @@ void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 
 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 {
 
 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Now, a negative radius value is interpreted to mean
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Now, a negative radius value is interpreted to mean


@@ -686,6 +841,10 @@ void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord h
 
 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {
 
 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = (x+width);
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = (x+width);


@@ -700,6 +859,10 @@ void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
 {
 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + w;
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + w;


@@ -743,6 +906,10 @@ void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,d
 
 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 {
 
 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
 
 #ifdef __WIN32__
     wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
 
 #ifdef __WIN32__


@@ -757,6 +924,10 @@ void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 
 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
 {
 
 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
 
     int width = bmp.GetWidth(),
     wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
 
     int width = bmp.GetWidth(),


@@ -764,6 +935,10 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
 
     HBITMAP hbmpMask = 0;
 
 
     HBITMAP hbmpMask = 0;
 

+#if wxUSE_PALETTE
+    HPALETTE oldPal = 0;
+#endif // wxUSE_PALETTE
+

     if ( useMask )
     {
         wxMask *mask = bmp.GetMask();
     if ( useMask )
     {
         wxMask *mask = bmp.GetMask();


@@ -777,7 +952,6 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
             useMask = FALSE;
         }
     }
             useMask = FALSE;
         }
     }

-

     if ( useMask )
     {
 #ifdef __WIN32__
     if ( useMask )
     {
 #ifdef __WIN32__


@@ -787,15 +961,33 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
         // than the wxWindows fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
         bool ok = FALSE;
         // than the wxWindows fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
         bool ok = FALSE;

-        if (wxSystemSettings::GetOptionInt(wxT("no-maskblt")) == 0)
+#if wxUSE_SYSTEM_OPTIONS
+        if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
+#endif

         {
         {

+            HDC cdc = GetHdc();

             HDC hdcMem = ::CreateCompatibleDC(GetHdc());
             HDC hdcMem = ::CreateCompatibleDC(GetHdc());

-            ::SelectObject(hdcMem, GetHbitmapOf(bmp));
+            HGDIOBJ hOldBitmap = ::SelectObject(hdcMem, GetHbitmapOf(bmp));
+#if wxUSE_PALETTE
+            wxPalette *pal = bmp.GetPalette();
+            if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
+            {
+                oldPal = ::SelectPalette(hdcMem, GetHpaletteOf(*pal), FALSE);
+                ::RealizePalette(hdcMem);
+            }
+#endif // wxUSE_PALETTE

 
 

-            ok = ::MaskBlt(GetHdc(), x, y, width, height,
+            ok = ::MaskBlt(cdc, x, y, width, height,

                             hdcMem, 0, 0,
                             hbmpMask, 0, 0,
                             MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
                             hdcMem, 0, 0,
                             hbmpMask, 0, 0,
                             MAKEROP4(SRCCOPY, DSTCOPY)) != 0;

+
+#if wxUSE_PALETTE
+            if (oldPal)
+                ::SelectPalette(hdcMem, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
+            ::SelectObject(hdcMem, hOldBitmap);

             ::DeleteDC(hdcMem);
         }
 
             ::DeleteDC(hdcMem);
         }
 


@@ -831,8 +1023,24 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
             ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
         }
 
             ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
         }
 

-        ::SelectObject( memdc, hbitmap );
+#if wxUSE_PALETTE
+        wxPalette *pal = bmp.GetPalette();
+        if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
+        {
+            oldPal = ::SelectPalette(memdc, GetHpaletteOf(*pal), FALSE);
+            ::RealizePalette(memdc);
+        }
+#endif // wxUSE_PALETTE
+
+        HGDIOBJ hOldBitmap = ::SelectObject( memdc, hbitmap );

         ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
         ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);

+
+#if wxUSE_PALETTE
+        if (oldPal)
+            ::SelectPalette(memdc, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
+        ::SelectObject( memdc, hOldBitmap );

         ::DeleteDC( memdc );
 
         ::SetTextColor(GetHdc(), old_textground);
         ::DeleteDC( memdc );
 
         ::SetTextColor(GetHdc(), old_textground);


@@ -842,6 +1050,10 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
 
 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 {
 
 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     DrawAnyText(text, x, y);
 
     // update the bounding box
     DrawAnyText(text, x, y);
 
     // update the bounding box


@@ -854,6 +1066,10 @@ void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 
 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
 {
 
 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // prepare for drawing the text
     if ( m_textForegroundColour.Ok() )
         SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
     // prepare for drawing the text
     if ( m_textForegroundColour.Ok() )
         SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());


@@ -886,6 +1102,10 @@ void wxDC::DoDrawRotatedText(const wxString& text,
                              wxCoord x, wxCoord y,
                              double angle)
 {
                              wxCoord x, wxCoord y,
                              double angle)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // we test that we have some font because otherwise we should still use the
     // "else" part below to avoid that DrawRotatedText(angle = 180) and
     // DrawRotatedText(angle = 0) use different fonts (we can't use the default
     // we test that we have some font because otherwise we should still use the
     // "else" part below to avoid that DrawRotatedText(angle = 180) and
     // DrawRotatedText(angle = 0) use different fonts (we can't use the default


@@ -894,11 +1114,13 @@ void wxDC::DoDrawRotatedText(const wxString& text,
     {
         DoDrawText(text, x, y);
     }
     {
         DoDrawText(text, x, y);
     }

+#ifndef __WXMICROWIN__

     else
     {
     else
     {

-        // NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
-        //     can't have non zero orientation/escapement
-        wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
+        // NB: don't take DEFAULT_GUI_FONT (a.k.a. wxSYS_DEFAULT_GUI_FONT)
+        //     because it's not TrueType and so can't have non zero
+        //     orientation/escapement under Win9x
+        wxFont font = m_font.Ok() ? m_font : *wxSWISS_FONT;

         HFONT hfont = (HFONT)font.GetResourceHandle();
         LOGFONT lf;
         if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
         HFONT hfont = (HFONT)font.GetResourceHandle();
         LOGFONT lf;
         if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )


@@ -936,57 +1158,86 @@ void wxDC::DoDrawRotatedText(const wxString& text,
 
         // "upper left" and "upper right"
         CalcBoundingBox(x, y);
 
         // "upper left" and "upper right"
         CalcBoundingBox(x, y);

-        CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
+        CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(h*sin(rad)));

 
         // "bottom left" and "bottom right"
         x += (wxCoord)(h*sin(rad));
         y += (wxCoord)(h*cos(rad));
         CalcBoundingBox(x, y);
 
         // "bottom left" and "bottom right"
         x += (wxCoord)(h*sin(rad));
         y += (wxCoord)(h*cos(rad));
         CalcBoundingBox(x, y);

-        CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
+        CalcBoundingBox(x + wxCoord(h*sin(rad)), y + wxCoord(h*cos(rad)));

     }
     }

+#endif

 }
 
 // ---------------------------------------------------------------------------
 // set GDI objects
 // ---------------------------------------------------------------------------
 
 }
 
 // ---------------------------------------------------------------------------
 // set GDI objects
 // ---------------------------------------------------------------------------
 

-void wxDC::SetPalette(const wxPalette& palette)
+#if wxUSE_PALETTE
+
+void wxDC::DoSelectPalette(bool realize)

 {
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldPalette)
     {
     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldPalette)
     {

-        ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
+        ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE);

         m_oldPalette = 0;
     }
 
         m_oldPalette = 0;
     }
 

-    m_palette = palette;
-
-    if (!m_palette.Ok())
+    if ( m_palette.Ok() )

     {
     {

-        // Setting a NULL colourmap is a way of restoring
-        // the original colourmap
-        if (m_oldPalette)
-        {
-            ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
-            m_oldPalette = 0;
-        }
+        HPALETTE oldPal = ::SelectPalette(GetHdc(),
+                                          GetHpaletteOf(m_palette),
+                                          FALSE);
+        if (!m_oldPalette)
+            m_oldPalette = (WXHPALETTE) oldPal;

 
 

-        return;
+        if (realize)
+            ::RealizePalette(GetHdc());

     }
     }

+}

 
 

-    if (m_palette.Ok() && m_palette.GetHPALETTE())
+void wxDC::SetPalette(const wxPalette& palette)
+{
+    if ( palette.Ok() )

     {
     {

-        HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
-        if (!m_oldPalette)
-            m_oldPalette = (WXHPALETTE) oldPal;
+        m_palette = palette;
+        DoSelectPalette(TRUE);
+    }
+}

 
 

-        ::RealizePalette(GetHdc());
+void wxDC::InitializePalette()
+{
+    if ( wxDisplayDepth() <= 8 )
+    {
+        // look for any window or parent that has a custom palette. If any has
+        // one then we need to use it in drawing operations
+        wxWindow *win = m_canvas->GetAncestorWithCustomPalette();
+
+        m_hasCustomPalette = win && win->HasCustomPalette();
+        if ( m_hasCustomPalette )
+        {
+            m_palette = win->GetPalette();
+
+            // turn on MSW translation for this palette
+            DoSelectPalette();
+        }

     }
 }
 
     }
 }
 

+#endif // wxUSE_PALETTE
+

 void wxDC::SetFont(const wxFont& the_font)
 {
 void wxDC::SetFont(const wxFont& the_font)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldFont)
     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldFont)


@@ -1018,6 +1269,10 @@ void wxDC::SetFont(const wxFont& the_font)
 
 void wxDC::SetPen(const wxPen& pen)
 {
 
 void wxDC::SetPen(const wxPen& pen)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldPen)
     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldPen)


@@ -1048,6 +1303,10 @@ void wxDC::SetPen(const wxPen& pen)
 
 void wxDC::SetBrush(const wxBrush& brush)
 {
 
 void wxDC::SetBrush(const wxBrush& brush)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldBrush)
     // Set the old object temporarily, in case the assignment deletes an object
     // that's not yet selected out.
     if (m_oldBrush)


@@ -1072,12 +1331,12 @@ void wxDC::SetBrush(const wxBrush& brush)
         if ( stipple && stipple->Ok() )
         {
 #ifdef __WIN32__
         if ( stipple && stipple->Ok() )
         {
 #ifdef __WIN32__

-               ::SetBrushOrgEx(GetHdc(),
+            ::SetBrushOrgEx(GetHdc(),

                             m_deviceOriginX % stipple->GetWidth(),
                             m_deviceOriginY % stipple->GetHeight(),
                             NULL);  // don't need previous brush origin
 #else
                             m_deviceOriginX % stipple->GetWidth(),
                             m_deviceOriginY % stipple->GetHeight(),
                             NULL);  // don't need previous brush origin
 #else

-               ::SetBrushOrg(GetHdc(),
+            ::SetBrushOrg(GetHdc(),

                             m_deviceOriginX % stipple->GetWidth(),
                             m_deviceOriginY % stipple->GetHeight());
 #endif
                             m_deviceOriginX % stipple->GetWidth(),
                             m_deviceOriginY % stipple->GetHeight());
 #endif


@@ -1095,6 +1354,10 @@ void wxDC::SetBrush(const wxBrush& brush)
 
 void wxDC::SetBackground(const wxBrush& brush)
 {
 
 void wxDC::SetBackground(const wxBrush& brush)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     m_backgroundBrush = brush;
 
     if (!m_backgroundBrush.Ok())
     m_backgroundBrush = brush;
 
     if (!m_backgroundBrush.Ok())


@@ -1136,22 +1399,22 @@ void wxDC::SetBackground(const wxBrush& brush)
 
 void wxDC::SetBackgroundMode(int mode)
 {
 
 void wxDC::SetBackgroundMode(int mode)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     m_backgroundMode = mode;
 
     // SetBackgroundColour now only refers to text background
     // and m_backgroundMode is used there
     m_backgroundMode = mode;
 
     // SetBackgroundColour now only refers to text background
     // and m_backgroundMode is used there

-
-/*
-    if (m_backgroundMode == wxTRANSPARENT)
-        ::SetBkMode(GetHdc(), TRANSPARENT);
-    else
-        ::SetBkMode(GetHdc(), OPAQUE);
-       Last change:  AC   29 Jan 101    8:54 pm
-*/

 }
 
 void wxDC::SetLogicalFunction(int function)
 {
 }
 
 void wxDC::SetLogicalFunction(int function)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     m_logicalFunction = function;
 
     SetRop(m_hDC);
     m_logicalFunction = function;
 
     SetRop(m_hDC);


@@ -1215,26 +1478,45 @@ void wxDC::EndPage()
 
 wxCoord wxDC::GetCharHeight() const
 {
 
 wxCoord wxDC::GetCharHeight() const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 0;
+#endif
+

     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
 
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
 

-    return YDEV2LOGREL(lpTextMetric.tmHeight);
+    return lpTextMetric.tmHeight;

 }
 
 wxCoord wxDC::GetCharWidth() const
 {
 }
 
 wxCoord wxDC::GetCharWidth() const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 0;
+#endif
+

     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
 
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
 

-    return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
+    return lpTextMetric.tmAveCharWidth;

 }
 
 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
                            wxCoord *descent, wxCoord *externalLeading,
                            wxFont *font) const
 {
 }
 
 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
                            wxCoord *descent, wxCoord *externalLeading,
                            wxFont *font) const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC())
+    {
+        if (x) *x = 0;
+        if (y) *y = 0;
+        if (descent) *descent = 0;
+        if (externalLeading) *externalLeading = 0;
+        return;
+    }
+#endif // __WXMICROWIN__
+

     HFONT hfontOld;
     if ( font )
     {
     HFONT hfontOld;
     if ( font )
     {


@@ -1253,10 +1535,14 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
     GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect);
     GetTextMetrics(GetHdc(), &tm);
 
     GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect);
     GetTextMetrics(GetHdc(), &tm);
 

-    if (x) *x = XDEV2LOGREL(sizeRect.cx);
-    if (y) *y = YDEV2LOGREL(sizeRect.cy);
-    if (descent) *descent = tm.tmDescent;
-    if (externalLeading) *externalLeading = tm.tmExternalLeading;
+    if (x)
+        *x = sizeRect.cx;
+    if (y)
+        *y = sizeRect.cy;
+    if (descent)
+        *descent = tm.tmDescent;
+    if (externalLeading)
+        *externalLeading = tm.tmExternalLeading;

 
     if ( hfontOld )
     {
 
     if ( hfontOld )
     {


@@ -1266,74 +1552,84 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
 
 void wxDC::SetMapMode(int mode)
 {
 
 void wxDC::SetMapMode(int mode)
 {

-    m_mappingMode = mode;
-
-    int pixel_width = 0;
-    int pixel_height = 0;
-    int mm_width = 0;
-    int mm_height = 0;
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif

 
 

-    pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
-    pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
-    mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
-    mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
+    m_mappingMode = mode;

 
 

-    if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
+    if ( mode == wxMM_TEXT )

     {
     {

-        return;
+        m_logicalScaleX =
+        m_logicalScaleY = 1.0;

     }
     }

-
-    double mm2pixelsX = pixel_width/mm_width;
-    double mm2pixelsY = pixel_height/mm_height;
-
-    switch (mode)
+    else // need to do some calculations

     {
     {

-    case wxMM_TWIPS:
-        {
-            m_logicalScaleX = (twips2mm * mm2pixelsX);
-            m_logicalScaleY = (twips2mm * mm2pixelsY);
-            break;
-        }
-    case wxMM_POINTS:
-        {
-            m_logicalScaleX = (pt2mm * mm2pixelsX);
-            m_logicalScaleY = (pt2mm * mm2pixelsY);
-            break;
-        }
-    case wxMM_METRIC:
-        {
-            m_logicalScaleX = mm2pixelsX;
-            m_logicalScaleY = mm2pixelsY;
-            break;
-        }
-    case wxMM_LOMETRIC:
+        int pixel_width = ::GetDeviceCaps(GetHdc(), HORZRES),
+            pixel_height = ::GetDeviceCaps(GetHdc(), VERTRES),
+            mm_width = ::GetDeviceCaps(GetHdc(), HORZSIZE),
+            mm_height = ::GetDeviceCaps(GetHdc(), VERTSIZE);
+
+        if ( (mm_width == 0) || (mm_height == 0) )

         {
         {

-            m_logicalScaleX = (mm2pixelsX/10.0);
-            m_logicalScaleY = (mm2pixelsY/10.0);
-            break;
+            // we can't calculate mm2pixels[XY] then!
+            return;

         }
         }

-    default:
-    case wxMM_TEXT:
+
+        double mm2pixelsX = pixel_width / mm_width,
+               mm2pixelsY = pixel_height / mm_height;
+
+        switch (mode)

         {
         {

-            m_logicalScaleX = 1.0;
-            m_logicalScaleY = 1.0;
-            break;
+            case wxMM_TWIPS:
+                m_logicalScaleX = twips2mm * mm2pixelsX;
+                m_logicalScaleY = twips2mm * mm2pixelsY;
+                break;
+
+            case wxMM_POINTS:
+                m_logicalScaleX = pt2mm * mm2pixelsX;
+                m_logicalScaleY = pt2mm * mm2pixelsY;
+                break;
+
+            case wxMM_METRIC:
+                m_logicalScaleX = mm2pixelsX;
+                m_logicalScaleY = mm2pixelsY;
+                break;
+
+            case wxMM_LOMETRIC:
+                m_logicalScaleX = mm2pixelsX / 10.0;
+                m_logicalScaleY = mm2pixelsY / 10.0;
+                break;
+
+            default:
+                wxFAIL_MSG( _T("unknown mapping mode in SetMapMode") );

         }
     }
 
         }
     }
 

-    if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
-        ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
+    // VZ: it seems very wasteful to always use MM_ANISOTROPIC when in 99% of
+    //     cases we could do with MM_TEXT and in the remaining 0.9% with
+    //     MM_ISOTROPIC (TODO!)
+    ::SetMapMode(GetHdc(), MM_ANISOTROPIC);

 
 

-    SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
-    m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
-    m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
-    ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
-    ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
-    ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
+    int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX,
+        height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY;
+
+    ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
+    ::SetWindowExtEx(GetHdc(), width, height, NULL);
+
+    ::SetViewportOrgEx(GetHdc(), m_deviceOriginX, m_deviceOriginY, NULL);
+    ::SetWindowOrgEx(GetHdc(), m_logicalOriginX, m_logicalOriginY, NULL);

 }
 
 void wxDC::SetUserScale(double x, double y)
 {
 }
 
 void wxDC::SetUserScale(double x, double y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    if ( x == m_userScaleX && y == m_userScaleY )
+        return;
+

     m_userScaleX = x;
     m_userScaleY = y;
 
     m_userScaleX = x;
     m_userScaleY = y;
 


@@ -1342,14 +1638,31 @@ void wxDC::SetUserScale(double x, double y)
 
 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 {
 
 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 {

-    m_signX = xLeftRight ? 1 : -1;
-    m_signY = yBottomUp ? -1 : 1;
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif

 
 

-    SetMapMode(m_mappingMode);
+    int signX = xLeftRight ? 1 : -1,
+        signY = yBottomUp ? -1 : 1;
+
+    if ( signX != m_signX || signY != m_signY )
+    {
+        m_signX = signX;
+        m_signY = signY;
+
+        SetMapMode(m_mappingMode);
+    }

 }
 
 void wxDC::SetSystemScale(double x, double y)
 {
 }
 
 void wxDC::SetSystemScale(double x, double y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    if ( x == m_scaleX && y == m_scaleY )
+        return;
+

     m_scaleX = x;
     m_scaleY = y;
 
     m_scaleX = x;
     m_scaleY = y;
 


@@ -1358,6 +1671,13 @@ void wxDC::SetSystemScale(double x, double y)
 
 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 {
 
 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    if ( x == m_logicalOriginX && y == m_logicalOriginY )
+        return;
+

     m_logicalOriginX = x;
     m_logicalOriginY = y;
 
     m_logicalOriginX = x;
     m_logicalOriginY = y;
 


@@ -1366,6 +1686,13 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 
 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
 {
 
 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    if ( x == m_deviceOriginX && y == m_deviceOriginY )
+        return;
+

     m_deviceOriginX = x;
     m_deviceOriginY = y;
 
     m_deviceOriginX = x;
     m_deviceOriginY = y;
 


@@ -1378,46 +1705,46 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
 
 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 {
 
 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
 {

-    double xRel = x - m_deviceOriginX;
-    xRel /= m_logicalScaleX*m_userScaleX*m_signX*m_scaleX;
-    return (wxCoord)(xRel + m_logicalOriginX);
+    return DeviceToLogicalXRel(x - m_deviceOriginX)*m_signX + m_logicalOriginX;

 }
 
 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 {
 }
 
 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
 {

-    return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
+    // axis orientation is not taken into account for conversion of a distance
+    return (wxCoord)(x / (m_logicalScaleX*m_userScaleX*m_scaleX));

 }
 
 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 {
 }
 
 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
 {

-    double yRel = y - m_deviceOriginY;
-    yRel /= m_logicalScaleY*m_userScaleY*m_signY*m_scaleY;
-    return (wxCoord)(yRel + m_logicalOriginY);
+    return DeviceToLogicalYRel(y - m_deviceOriginY)*m_signY + m_logicalOriginY;

 }
 
 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 {
 }
 
 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
 {

-    return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
+    // axis orientation is not taken into account for conversion of a distance
+    return (wxCoord)( y / (m_logicalScaleY*m_userScaleY*m_scaleY));

 }
 
 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 {
 }
 
 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
 {

-    return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
+    return LogicalToDeviceXRel(x - m_logicalOriginX)*m_signX + m_deviceOriginX;

 }
 
 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 {
 }
 
 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
 {

-    return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
+    // axis orientation is not taken into account for conversion of a distance
+    return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_scaleX);

 }
 
 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 {
 }
 
 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
 {

-    return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
+    return LogicalToDeviceYRel(y - m_logicalOriginY)*m_signY + m_deviceOriginY;

 }
 
 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 {
 }
 
 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 {

-    return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
+    // axis orientation is not taken into account for conversion of a distance
+    return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_scaleY);

 }
 
 // ---------------------------------------------------------------------------
 }
 
 // ---------------------------------------------------------------------------


@@ -1427,8 +1754,13 @@ wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
                   wxCoord width, wxCoord height,
                   wxDC *source, wxCoord xsrc, wxCoord ysrc,
 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
                   wxCoord width, wxCoord height,
                   wxDC *source, wxCoord xsrc, wxCoord ysrc,

-                  int rop, bool useMask)
+                  int rop, bool useMask,
+                  wxCoord xsrcMask, wxCoord ysrcMask)

 {
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return FALSE;
+#endif
+

     wxMask *mask = NULL;
     if ( useMask )
     {
     wxMask *mask = NULL;
     if ( useMask )
     {


@@ -1443,6 +1775,11 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
         }
     }
 
         }
     }
 

+    if (xsrcMask == -1 && ysrcMask == -1)
+    {
+        xsrcMask = xsrc; ysrcMask = ysrc;
+    }
+

     COLORREF old_textground = ::GetTextColor(GetHdc());
     COLORREF old_background = ::GetBkColor(GetHdc());
     if (m_textForegroundColour.Ok())
     COLORREF old_textground = ::GetTextColor(GetHdc());
     COLORREF old_background = ::GetBkColor(GetHdc());
     if (m_textForegroundColour.Ok())


@@ -1491,25 +1828,50 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
         // On some systems, MaskBlt succeeds yet is much much slower
         // than the wxWindows fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
         // On some systems, MaskBlt succeeds yet is much much slower
         // than the wxWindows fall-back implementation. So we need
         // to be able to switch this on and off at runtime.

-        if (wxSystemSettings::GetOptionInt(wxT("no-maskblt")) == 0)
+#if wxUSE_SYSTEM_OPTIONS
+        if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
+#endif

         {
         {

-           success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
-                            GetHdcOf(*source), xsrc, ysrc,
-                            (HBITMAP)mask->GetMaskBitmap(), xsrc, ysrc,
-                            MAKEROP4(dwRop, DSTCOPY)) != 0;
+           success = ::MaskBlt
+                       (
+                            GetHdc(),
+                            xdest, ydest, width, height,
+                            GetHdcOf(*source),
+                            xsrc, ysrc,
+                            (HBITMAP)mask->GetMaskBitmap(),
+                            xsrcMask, ysrcMask,
+                            MAKEROP4(dwRop, DSTCOPY)
+                        ) != 0;

         }
 
         if ( !success )
 #endif // Win32
         {
             // Blit bitmap with mask
         }
 
         if ( !success )
 #endif // Win32
         {
             // Blit bitmap with mask

+            HDC dc_mask ;
+            HDC  dc_buffer ;
+            HBITMAP buffer_bmap ;
+
+#if wxUSE_DC_CACHEING
+            // create a temp buffer bitmap and DCs to access it and the mask
+            wxDCCacheEntry* dcCacheEntry1 = FindDCInCache(NULL, source->GetHDC());
+            dc_mask = (HDC) dcCacheEntry1->m_dc;
+
+            wxDCCacheEntry* dcCacheEntry2 = FindDCInCache(dcCacheEntry1, GetHDC());
+            dc_buffer = (HDC) dcCacheEntry2->m_dc;
+
+            wxDCCacheEntry* bitmapCacheEntry = FindBitmapInCache(GetHDC(),
+                width, height);

 
 

+            buffer_bmap = (HBITMAP) bitmapCacheEntry->m_bitmap;
+#else // !wxUSE_DC_CACHEING

             // create a temp buffer bitmap and DCs to access it and the mask
             // create a temp buffer bitmap and DCs to access it and the mask

-            HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
-            HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
-            HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
-            ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
-            ::SelectObject(dc_buffer, buffer_bmap);
+            dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
+            dc_buffer = ::CreateCompatibleDC(GetHdc());
+            buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
+#endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING
+            HGDIOBJ hOldMaskBitmap = ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
+            HGDIOBJ hOldBufferBitmap = ::SelectObject(dc_buffer, buffer_bmap);

 
             // copy dest to buffer
             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
 
             // copy dest to buffer
             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,


@@ -1529,7 +1891,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
             COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
             COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
             COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
             COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,

-                           dc_mask, xsrc, ysrc, SRCAND) )
+                           dc_mask, xsrcMask, ysrcMask, SRCAND) )

             {
                 wxLogLastError(wxT("BitBlt"));
             }
             {
                 wxLogLastError(wxT("BitBlt"));
             }


@@ -1538,7 +1900,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
             ::SetBkColor(GetHdc(), RGB(0, 0, 0));
             ::SetTextColor(GetHdc(), RGB(255, 255, 255));
             if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
             ::SetBkColor(GetHdc(), RGB(0, 0, 0));
             ::SetTextColor(GetHdc(), RGB(255, 255, 255));
             if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,

-                           dc_mask, xsrc, ysrc, SRCAND) )
+                           dc_mask, xsrcMask, ysrcMask, SRCAND) )

             {
                 wxLogLastError(wxT("BitBlt"));
             }
             {
                 wxLogLastError(wxT("BitBlt"));
             }


@@ -1555,23 +1917,53 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
             }
 
             // tidy up temporary DCs and bitmap
             }
 
             // tidy up temporary DCs and bitmap

-            ::SelectObject(dc_mask, 0);
-            ::DeleteDC(dc_mask);
-            ::SelectObject(dc_buffer, 0);
-            ::DeleteDC(dc_buffer);
-            ::DeleteObject(buffer_bmap);
+            ::SelectObject(dc_mask, hOldMaskBitmap);
+            ::SelectObject(dc_buffer, hOldBufferBitmap);
+
+#if !wxUSE_DC_CACHEING
+            {
+                ::DeleteDC(dc_mask);
+                ::DeleteDC(dc_buffer);
+                ::DeleteObject(buffer_bmap);
+            }
+#endif

         }
     }
     else // no mask, just BitBlt() it
     {
         }
     }
     else // no mask, just BitBlt() it
     {

-        success = ::BitBlt(GetHdc(), xdest, ydest,
-                           (int)width, (int)height,
-                           GetHdcOf(*source), xsrc, ysrc, dwRop) != 0;
+        // use StretchBlt() if available
+        if ( ::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHBLT )
+        {
+            StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
+
+            success = ::StretchBlt
+                        (
+                            GetHdc(),
+                            xdest, ydest, width, height,
+                            GetHdcOf(*source),
+                            xsrc, ysrc, width, height,
+                            dwRop
+                        ) != 0;
+        }
+        else
+        {
+            success = ::BitBlt
+                        (
+                            GetHdc(),
+                            xdest, ydest,
+                            (int)width, (int)height,
+                            GetHdcOf(*source),
+                            xsrc, ysrc,
+                            dwRop
+                        ) != 0;
+        }
+

         if ( !success )
         {
         if ( !success )
         {

-            wxLogLastError(wxT("BitBlt"));
+            wxLogLastError(wxT("BitBlt/StretchBlt"));

         }
     }
         }
     }

+

     ::SetTextColor(GetHdc(), old_textground);
     ::SetBkColor(GetHdc(), old_background);
 
     ::SetTextColor(GetHdc(), old_textground);
     ::SetBkColor(GetHdc(), old_background);
 


@@ -1580,18 +1972,52 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 
 void wxDC::DoGetSize(int *w, int *h) const
 {
 
 void wxDC::DoGetSize(int *w, int *h) const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
     if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
 }
 
 void wxDC::DoGetSizeMM(int *w, int *h) const
 {
     if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
     if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
 }
 
 void wxDC::DoGetSizeMM(int *w, int *h) const
 {

-    if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
-    if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
+    // if we implement it in terms of DoGetSize() instead of directly using the
+    // results returned by GetDeviceCaps(HORZ/VERTSIZE) as was done before, it
+    // will also work for wxWindowDC and wxClientDC even though their size is
+    // not the same as the total size of the screen
+    int wPixels, hPixels;
+    DoGetSize(&wPixels, &hPixels);
+
+    if ( w )
+    {
+        int wTotal = ::GetDeviceCaps(GetHdc(), HORZRES);
+
+        wxCHECK_RET( wTotal, _T("0 width device?") );
+
+        *w = (wPixels * ::GetDeviceCaps(GetHdc(), HORZSIZE)) / wTotal;
+    }
+
+    if ( h )
+    {
+        int hTotal = ::GetDeviceCaps(GetHdc(), VERTRES);
+
+        wxCHECK_RET( hTotal, _T("0 height device?") );
+
+        *h = (hPixels * ::GetDeviceCaps(GetHdc(), VERTSIZE)) / hTotal;
+    }

 }
 
 wxSize wxDC::GetPPI() const
 {
 }
 
 wxSize wxDC::GetPPI() const
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return wxSize();
+#endif
+

     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
 
     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
 


@@ -1601,23 +2027,149 @@ wxSize wxDC::GetPPI() const
 // For use by wxWindows only, unless custom units are required.
 void wxDC::SetLogicalScale(double x, double y)
 {
 // For use by wxWindows only, unless custom units are required.
 void wxDC::SetLogicalScale(double x, double y)
 {

+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+

     m_logicalScaleX = x;
     m_logicalScaleY = y;
 }
 
     m_logicalScaleX = x;
     m_logicalScaleY = y;
 }
 

-#if WXWIN_COMPATIBILITY
-void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
-                         float *descent, float *externalLeading,
-                         wxFont *theFont, bool use16bit) const
+#if wxUSE_DC_CACHEING
+
+/*
+ * This implementation is a bit ugly and uses the old-fashioned wxList class, so I will
+ * improve it in due course, either using arrays, or simply storing pointers to one
+ * entry for the bitmap, and two for the DCs. -- JACS
+ */
+
+wxList wxDC::sm_bitmapCache;
+wxList wxDC::sm_dcCache;
+
+wxDCCacheEntry::wxDCCacheEntry(WXHBITMAP hBitmap, int w, int h, int depth)

 {
 {

-    wxCoord x1, y1, descent1, externalLeading1;
-    GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
-    *x = x1; *y = y1;
-    if (descent)
-        *descent = descent1;
-    if (externalLeading)
-        *externalLeading = externalLeading1;
+    m_bitmap = hBitmap;
+    m_dc = 0;
+    m_width = w;
+    m_height = h;
+    m_depth = depth;
+}
+
+wxDCCacheEntry::wxDCCacheEntry(WXHDC hDC, int depth)
+{
+    m_bitmap = 0;
+    m_dc = hDC;
+    m_width = 0;
+    m_height = 0;
+    m_depth = depth;
+}
+
+wxDCCacheEntry::~wxDCCacheEntry()
+{
+    if (m_bitmap)
+        ::DeleteObject((HBITMAP) m_bitmap);
+    if (m_dc)
+        ::DeleteDC((HDC) m_dc);
+}
+
+wxDCCacheEntry* wxDC::FindBitmapInCache(WXHDC dc, int w, int h)
+{
+    int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
+    wxNode* node = sm_bitmapCache.First();
+    while (node)
+    {
+        wxDCCacheEntry* entry = (wxDCCacheEntry*) node->Data();
+
+        if (entry->m_depth == depth)
+        {
+            if (entry->m_width < w || entry->m_height < h)
+            {
+                ::DeleteObject((HBITMAP) entry->m_bitmap);
+                entry->m_bitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h);
+                if ( !entry->m_bitmap)
+                {
+                    wxLogLastError(wxT("CreateCompatibleBitmap"));
+                }
+                entry->m_width = w; entry->m_height = h;
+                return entry;
+            }
+            return entry;
+        }
+
+        node = node->Next();
+    }
+    WXHBITMAP hBitmap = (WXHBITMAP) ::CreateCompatibleBitmap((HDC) dc, w, h);
+    if ( !hBitmap)
+    {
+        wxLogLastError(wxT("CreateCompatibleBitmap"));
+    }
+    wxDCCacheEntry* entry = new wxDCCacheEntry(hBitmap, w, h, depth);
+    AddToBitmapCache(entry);
+    return entry;
+}
+
+wxDCCacheEntry* wxDC::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc)
+{
+    int depth = ::GetDeviceCaps((HDC) dc, PLANES) * ::GetDeviceCaps((HDC) dc, BITSPIXEL);
+    wxNode* node = sm_dcCache.First();
+    while (node)
+    {
+        wxDCCacheEntry* entry = (wxDCCacheEntry*) node->Data();
+
+        // Don't return the same one as we already have
+        if (!notThis || (notThis != entry))
+        {
+            if (entry->m_depth == depth)
+            {
+                return entry;
+            }
+        }
+
+        node = node->Next();
+    }
+    WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc);
+    if ( !hDC)
+    {
+        wxLogLastError(wxT("CreateCompatibleDC"));
+    }
+    wxDCCacheEntry* entry = new wxDCCacheEntry(hDC, depth);
+    AddToDCCache(entry);
+    return entry;
+}
+
+void wxDC::AddToBitmapCache(wxDCCacheEntry* entry)
+{
+    sm_bitmapCache.Append(entry);

 }
 }

-#endif

 
 

+void wxDC::AddToDCCache(wxDCCacheEntry* entry)
+{
+    sm_dcCache.Append(entry);
+}
+
+void wxDC::ClearCache()
+{
+    sm_dcCache.DeleteContents(TRUE);
+    sm_dcCache.Clear();
+    sm_dcCache.DeleteContents(FALSE);
+    sm_bitmapCache.DeleteContents(TRUE);
+    sm_bitmapCache.Clear();
+    sm_bitmapCache.DeleteContents(FALSE);
+}
+
+// Clean up cache at app exit
+class wxDCModule : public wxModule
+{
+public:
+    virtual bool OnInit() { return TRUE; }
+    virtual void OnExit() { wxDC::ClearCache(); }
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxDCModule)
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule)
+
+#endif
+    // wxUSE_DC_CACHEING