X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7ecf5ac7cd334ba3f447625dd7d970d62c302fcc..af01f1ba0d697c07173f436ab661b4c833258a91:/src/msw/dc.cpp

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 0bbb739078..f3d7c453e4 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -40,15 +40,16 @@
     #include "wx/icon.h"
 #endif
 
-#include "wx/settings.h"
+#include "wx/sysopt.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>
 
-#if wxUSE_COMMON_DIALOGS
+#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
     #include <commdlg.h>
 #endif
 
@@ -177,7 +178,9 @@ wxDC::wxDC()
     m_oldPen = 0;
     m_oldBrush = 0;
     m_oldFont = 0;
+#if wxUSE_PALETTE
     m_oldPalette = 0;
+#endif // wxUSE_PALETTE
 
     m_bOwnsDC = FALSE;
     m_hDC = 0;
@@ -245,16 +248,21 @@ void wxDC::SelectOldObjects(WXHDC dc)
             ::SelectObject((HDC) dc, (HFONT) m_oldFont);
         }
         m_oldFont = 0;
+
+#if wxUSE_PALETTE
         if (m_oldPalette)
         {
-            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
+            ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, FALSE);
         }
         m_oldPalette = 0;
+#endif // wxUSE_PALETTE
     }
 
     m_brush = wxNullBrush;
     m_pen = wxNullPen;
+#if wxUSE_PALETTE
     m_palette = wxNullPalette;
+#endif // wxUSE_PALETTE
     m_font = wxNullFont;
     m_backgroundBrush = wxNullBrush;
     m_selectedBitmap = wxNullBitmap;
@@ -266,6 +274,10 @@ void wxDC::SelectOldObjects(WXHDC dc)
 
 void wxDC::UpdateClipBox()
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     RECT rect;
     GetClipBox(GetHdc(), &rect);
 
@@ -277,6 +289,10 @@ void wxDC::UpdateClipBox()
 
 void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_clipping = TRUE;
 
     // the region coords are always the device ones, so do the translation
@@ -305,6 +321,10 @@ void wxDC::DoSetClippingRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 
 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxCHECK_RET( GetHrgnOf(region), wxT("invalid clipping region") );
 
     m_clipping = TRUE;
@@ -320,6 +340,10 @@ void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 
 void wxDC::DestroyClippingRegion()
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     if (m_clipping && m_hDC)
     {
         // TODO: this should restore the previous clipping region,
@@ -357,6 +381,10 @@ bool wxDC::CanGetTextExtent() const
 
 int wxDC::GetDepth() const
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 16;
+#endif
+
     return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
 }
 
@@ -366,6 +394,10 @@ int wxDC::GetDepth() const
 
 void wxDC::Clear()
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     RECT rect;
     if ( m_canvas )
     {
@@ -400,6 +432,10 @@ void wxDC::Clear()
 
 void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
                          col.GetPixel(),
                          style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
@@ -425,6 +461,10 @@ void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
 
 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
@@ -437,6 +477,10 @@ bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
 
 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;
@@ -454,6 +498,10 @@ void wxDC::DoCrossHair(wxCoord x, wxCoord y)
 
 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));
 
@@ -471,6 +519,10 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
                      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;
@@ -519,6 +571,10 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
 void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
                            wxCoord width, wxCoord height)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxCoord x2 = x1 + width,
             y2 = y1 + height;
 
@@ -553,6 +609,10 @@ void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
 
 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     COLORREF color = 0x00ffffff;
     if (m_pen.Ok())
     {
@@ -566,6 +626,10 @@ void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 
 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
@@ -599,6 +663,10 @@ void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffs
 
 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)
     {
@@ -626,6 +694,10 @@ void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset
 
 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;
@@ -663,6 +735,10 @@ void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 
 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Now, a negative radius value is interpreted to mean
@@ -699,6 +775,10 @@ void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord h
 
 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);
@@ -713,6 +793,10 @@ 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)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + w;
@@ -756,6 +840,10 @@ void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,d
 
 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
 
 #ifdef __WIN32__
@@ -770,6 +858,10 @@ void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
 
 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(),
@@ -777,6 +869,10 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
 
     HBITMAP hbmpMask = 0;
 
+#if wxUSE_PALETTE
+    HPALETTE oldPal = 0;
+#endif // wxUSE_PALETTE
+
     if ( useMask )
     {
         wxMask *mask = bmp.GetMask();
@@ -800,15 +896,33 @@ 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;
-        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());
             ::SelectObject(hdcMem, GetHbitmapOf(bmp));
 
-            ok = ::MaskBlt(GetHdc(), x, y, width, height,
+#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(cdc, x, y, width, height,
                             hdcMem, 0, 0,
                             hbmpMask, 0, 0,
                             MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
+
+#if wxUSE_PALETTE
+            if (oldPal)
+                ::SelectPalette(hdcMem, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
             ::DeleteDC(hdcMem);
         }
 
@@ -844,8 +958,23 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
             ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
         }
 
+#if wxUSE_PALETTE
+            wxPalette *pal = bmp.GetPalette();
+            if ( pal && ::GetDeviceCaps(cdc,BITSPIXEL) <= 8 )
+            {
+                oldPal = ::SelectPalette(memdc, GetHpaletteOf(pal), FALSE);
+                ::RealizePalette(memdc);
+            }
+#endif // wxUSE_PALETTE
+
         ::SelectObject( memdc, hbitmap );
         ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
+
+#if wxUSE_PALETTE
+        if (oldPal)
+            ::SelectPalette(memdc, oldPal, FALSE);
+#endif // wxUSE_PALETTE
+
         ::DeleteDC( memdc );
 
         ::SetTextColor(GetHdc(), old_textground);
@@ -855,6 +984,10 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
 
 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     DrawAnyText(text, x, y);
 
     // update the bounding box
@@ -867,6 +1000,10 @@ void wxDC::DoDrawText(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());
@@ -899,6 +1036,10 @@ void wxDC::DoDrawRotatedText(const wxString& text,
                              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
@@ -910,9 +1051,10 @@ void wxDC::DoDrawRotatedText(const wxString& text,
 #ifndef __WXMICROWIN__
     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 )
@@ -965,13 +1107,19 @@ void wxDC::DoDrawRotatedText(const wxString& text,
 // set GDI objects
 // ---------------------------------------------------------------------------
 
+#if wxUSE_PALETTE
+
 void wxDC::SetPalette(const wxPalette& palette)
 {
+#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)
     {
-        ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
+        ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE);
         m_oldPalette = 0;
     }
 
@@ -983,7 +1131,7 @@ void wxDC::SetPalette(const wxPalette& palette)
         // the original colourmap
         if (m_oldPalette)
         {
-            ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
+            ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, FALSE);
             m_oldPalette = 0;
         }
 
@@ -992,7 +1140,7 @@ void wxDC::SetPalette(const wxPalette& palette)
 
     if (m_palette.Ok() && m_palette.GetHPALETTE())
     {
-        HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
+        HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), FALSE);
         if (!m_oldPalette)
             m_oldPalette = (WXHPALETTE) oldPal;
 
@@ -1000,8 +1148,14 @@ void wxDC::SetPalette(const wxPalette& palette)
     }
 }
 
+#endif // wxUSE_PALETTE
+
 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)
@@ -1033,6 +1187,10 @@ void wxDC::SetFont(const wxFont& the_font)
 
 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)
@@ -1063,6 +1221,10 @@ void wxDC::SetPen(const wxPen& pen)
 
 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)
@@ -1110,6 +1272,10 @@ void wxDC::SetBrush(const wxBrush& brush)
 
 void wxDC::SetBackground(const wxBrush& brush)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_backgroundBrush = brush;
 
     if (!m_backgroundBrush.Ok())
@@ -1151,6 +1317,10 @@ void wxDC::SetBackground(const wxBrush& brush)
 
 void wxDC::SetBackgroundMode(int mode)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_backgroundMode = mode;
 
     // SetBackgroundColour now only refers to text background
@@ -1167,6 +1337,10 @@ void wxDC::SetBackgroundMode(int mode)
 
 void wxDC::SetLogicalFunction(int function)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_logicalFunction = function;
 
     SetRop(m_hDC);
@@ -1230,6 +1404,10 @@ void wxDC::EndPage()
 
 wxCoord wxDC::GetCharHeight() const
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 0;
+#endif
+
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
@@ -1239,6 +1417,10 @@ wxCoord wxDC::GetCharHeight() const
 
 wxCoord wxDC::GetCharWidth() const
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return 0;
+#endif
+
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
@@ -1250,6 +1432,17 @@ 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
+
     HFONT hfontOld;
     if ( font )
     {
@@ -1281,6 +1474,10 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
 
 void wxDC::SetMapMode(int mode)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_mappingMode = mode;
 
     int pixel_width = 0;
@@ -1349,6 +1546,10 @@ void wxDC::SetMapMode(int mode)
 
 void wxDC::SetUserScale(double x, double y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_userScaleX = x;
     m_userScaleY = y;
 
@@ -1357,6 +1558,10 @@ void wxDC::SetUserScale(double x, double y)
 
 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_signX = xLeftRight ? 1 : -1;
     m_signY = yBottomUp ? -1 : 1;
 
@@ -1365,6 +1570,10 @@ void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 
 void wxDC::SetSystemScale(double x, double y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_scaleX = x;
     m_scaleY = y;
 
@@ -1373,6 +1582,10 @@ void wxDC::SetSystemScale(double x, double y)
 
 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_logicalOriginX = x;
     m_logicalOriginY = y;
 
@@ -1381,6 +1594,10 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 
 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     m_deviceOriginX = x;
     m_deviceOriginY = y;
 
@@ -1442,8 +1659,13 @@ wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
 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 )
     {
@@ -1458,6 +1680,11 @@ 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())
@@ -1506,11 +1733,13 @@ 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.
-        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,
+                            (HBITMAP)mask->GetMaskBitmap(), xsrcMask, ysrcMask,
                             MAKEROP4(dwRop, DSTCOPY)) != 0;
         }
 
@@ -1518,11 +1747,28 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 #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
-            HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
-            HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
-            HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
+            dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
+            dc_buffer = ::CreateCompatibleDC(GetHdc());
+            buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
+#endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING
             ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
             ::SelectObject(dc_buffer, buffer_bmap);
 
@@ -1544,7 +1790,7 @@ 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,
-                           dc_mask, xsrc, ysrc, SRCAND) )
+                           dc_mask, xsrcMask, ysrcMask, SRCAND) )
             {
                 wxLogLastError(wxT("BitBlt"));
             }
@@ -1553,7 +1799,7 @@ 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,
-                           dc_mask, xsrc, ysrc, SRCAND) )
+                           dc_mask, xsrcMask, ysrcMask, SRCAND) )
             {
                 wxLogLastError(wxT("BitBlt"));
             }
@@ -1571,10 +1817,15 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 
             // tidy up temporary DCs and bitmap
             ::SelectObject(dc_mask, 0);
-            ::DeleteDC(dc_mask);
             ::SelectObject(dc_buffer, 0);
-            ::DeleteDC(dc_buffer);
-            ::DeleteObject(buffer_bmap);
+
+#if !wxUSE_DC_CACHEING
+            {
+                ::DeleteDC(dc_mask);
+                ::DeleteDC(dc_buffer);
+                ::DeleteObject(buffer_bmap);
+            }
+#endif
         }
     }
     else // no mask, just BitBlt() it
@@ -1595,18 +1846,30 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 
 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
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
     if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
 }
 
 wxSize wxDC::GetPPI() const
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return wxSize();
+#endif
+
     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
 
@@ -1616,6 +1879,10 @@ wxSize wxDC::GetPPI() const
 // 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;
 }
@@ -1625,6 +1892,10 @@ void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
                          float *descent, float *externalLeading,
                          wxFont *theFont, bool use16bit) const
 {
+#ifdef __WXMICROWIN__
+    if (!GetHDC()) return;
+#endif
+
     wxCoord x1, y1, descent1, externalLeading1;
     GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
     *x = x1; *y = y1;
@@ -1635,4 +1906,141 @@ void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
 }
 #endif
 
+#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)
+{
+    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);
+}
+
+void wxDC::AddToDCCache(wxDCCacheEntry* entry)
+{
+    sm_dcCache.Append(entry);
+}
+
+void wxDC::ClearCache()
+{
+    sm_bitmapCache.DeleteContents(TRUE);
+    sm_bitmapCache.Clear();
+    sm_bitmapCache.DeleteContents(FALSE);
+    sm_dcCache.DeleteContents(TRUE);
+    sm_dcCache.Clear();
+    sm_dcCache.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