X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/277480474552707c27c7466bb5e5d1738a16372b..e7ca6139d062c37cc7c056b6647097e999b714cd:/src/msw/dc.cpp

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index a9cfabdf12..f3d7c453e4 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -42,13 +42,14 @@
 
 #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;
@@ -269,7 +277,7 @@ void wxDC::UpdateClipBox()
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     RECT rect;
     GetClipBox(GetHdc(), &rect);
 
@@ -284,7 +292,7 @@ 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
@@ -316,7 +324,7 @@ void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxCHECK_RET( GetHrgnOf(region), wxT("invalid clipping region") );
 
     m_clipping = TRUE;
@@ -335,7 +343,7 @@ void wxDC::DestroyClippingRegion()
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     if (m_clipping && m_hDC)
     {
         // TODO: this should restore the previous clipping region,
@@ -376,7 +384,7 @@ int wxDC::GetDepth() const
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return 16;
 #endif
-    
+
     return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
 }
 
@@ -389,7 +397,7 @@ void wxDC::Clear()
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     RECT rect;
     if ( m_canvas )
     {
@@ -427,7 +435,7 @@ 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
@@ -456,7 +464,7 @@ 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
@@ -472,7 +480,7 @@ 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;
@@ -493,7 +501,7 @@ 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));
 
@@ -514,7 +522,7 @@ void wxDC::DoDrawArc(wxCoord x1, wxCoord y1,
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     double dx = xc - x1;
@@ -566,7 +574,7 @@ void wxDC::DoDrawCheckMark(wxCoord x1, wxCoord y1,
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxCoord x2 = x1 + width,
             y2 = y1 + height;
 
@@ -604,7 +612,7 @@ void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     COLORREF color = 0x00ffffff;
     if (m_pen.Ok())
     {
@@ -621,7 +629,7 @@ void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffs
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Do things less efficiently if we have offsets
@@ -658,7 +666,7 @@ 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)
     {
@@ -689,7 +697,7 @@ 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;
@@ -730,7 +738,7 @@ void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord h
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     // Now, a negative radius value is interpreted to mean
@@ -770,7 +778,7 @@ 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);
@@ -788,7 +796,7 @@ void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,d
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
 
     wxCoord x2 = x + w;
@@ -835,7 +843,7 @@ 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__
@@ -853,7 +861,7 @@ 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(),
@@ -861,6 +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();
@@ -888,13 +900,29 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
         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);
         }
 
@@ -930,8 +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);
@@ -944,7 +987,7 @@ void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     DrawAnyText(text, x, y);
 
     // update the bounding box
@@ -960,7 +1003,7 @@ 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());
@@ -996,7 +1039,7 @@ void wxDC::DoDrawRotatedText(const wxString& text,
 #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
@@ -1008,9 +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 )
@@ -1063,17 +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;
     }
 
@@ -1085,7 +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;
         }
 
@@ -1094,7 +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;
 
@@ -1102,12 +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)
@@ -1142,7 +1190,7 @@ 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)
@@ -1176,7 +1224,7 @@ 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)
@@ -1227,7 +1275,7 @@ void wxDC::SetBackground(const wxBrush& brush)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_backgroundBrush = brush;
 
     if (!m_backgroundBrush.Ok())
@@ -1272,7 +1320,7 @@ void wxDC::SetBackgroundMode(int mode)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_backgroundMode = mode;
 
     // SetBackgroundColour now only refers to text background
@@ -1292,7 +1340,7 @@ void wxDC::SetLogicalFunction(int function)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_logicalFunction = function;
 
     SetRop(m_hDC);
@@ -1359,7 +1407,7 @@ wxCoord wxDC::GetCharHeight() const
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return 0;
 #endif
-    
+
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
@@ -1372,7 +1420,7 @@ wxCoord wxDC::GetCharWidth() const
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return 0;
 #endif
-    
+
     TEXTMETRIC lpTextMetric;
 
     GetTextMetrics(GetHdc(), &lpTextMetric);
@@ -1394,7 +1442,7 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
 	return;
     }
 #endif
-    
+
     HFONT hfontOld;
     if ( font )
     {
@@ -1429,7 +1477,7 @@ void wxDC::SetMapMode(int mode)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_mappingMode = mode;
 
     int pixel_width = 0;
@@ -1501,7 +1549,7 @@ void wxDC::SetUserScale(double x, double y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_userScaleX = x;
     m_userScaleY = y;
 
@@ -1513,7 +1561,7 @@ void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_signX = xLeftRight ? 1 : -1;
     m_signY = yBottomUp ? -1 : 1;
 
@@ -1525,7 +1573,7 @@ void wxDC::SetSystemScale(double x, double y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_scaleX = x;
     m_scaleY = y;
 
@@ -1537,7 +1585,7 @@ void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_logicalOriginX = x;
     m_logicalOriginY = y;
 
@@ -1549,7 +1597,7 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_deviceOriginX = x;
     m_deviceOriginY = y;
 
@@ -1617,7 +1665,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return FALSE;
 #endif
-    
+
     wxMask *mask = NULL;
     if ( useMask )
     {
@@ -1704,30 +1752,25 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
             HBITMAP buffer_bmap ;
 
 #if wxUSE_DC_CACHEING
-            if (TRUE)
-            {
-                // 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, dest->GetHDC());
-                dc_buffer = (HDC) dcCacheEntry2->m_dc;
-
-                wxDCCacheEntry* bitmapCacheEntry = FindBitmapInCache(dest->GetHDC(),
-                    width, height);
-
-                buffer_bmap = (HBITMAP) bitmapCacheEntry->m_bitmap;
-            }
-            else
-#endif
-            {
-                // create a temp buffer bitmap and DCs to access it and the mask
-                dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
-                dc_buffer = ::CreateCompatibleDC(GetHdc());
-                buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
-                ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
-                ::SelectObject(dc_buffer, buffer_bmap);
-            }
+            // 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
+            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);
 
             // copy dest to buffer
             if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
@@ -1806,7 +1849,7 @@ 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);
 }
@@ -1816,7 +1859,7 @@ 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);
 }
@@ -1826,7 +1869,7 @@ wxSize wxDC::GetPPI() const
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return wxSize();
 #endif
-    
+
     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
 
@@ -1839,7 +1882,7 @@ void wxDC::SetLogicalScale(double x, double y)
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     m_logicalScaleX = x;
     m_logicalScaleY = y;
 }
@@ -1852,7 +1895,7 @@ void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
 #ifdef __WXMICROWIN__
     if (!GetHDC()) return;
 #endif
-    
+
     wxCoord x1, y1, descent1, externalLeading1;
     GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
     *x = x1; *y = y1;
@@ -1985,6 +2028,19 @@ void wxDC::ClearCache()
     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