X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/1a4b50d2f1a81aa390ff70f4387bc776563cbab7..afd0f084f419d769dba772863472a3f388fd6ab1:/src/msw/dc.cpp?ds=sidebyside

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 5a72decc62..0bb8d8752b 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        dc.cpp
-// Purpose:     wxDC class
+// Name:        src/msw/dc.cpp
+// Purpose:     wxDC class for MSW port
 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
@@ -17,10 +17,6 @@
 // headers
 // ---------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "dc.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -29,6 +25,7 @@
 #endif
 
 #ifndef WX_PRECOMP
+    #include "wx/image.h"
     #include "wx/window.h"
     #include "wx/dc.h"
     #include "wx/utils.h"
@@ -40,25 +37,18 @@
     #include "wx/icon.h"
 #endif
 
-#include "wx/msw/private.h" // needs to be before #include <commdlg.h>
-#include "wx/msw/missing.h" // needs to be before #include <commdlg.h>
-
 #include "wx/sysopt.h"
 #include "wx/dcprint.h"
 #include "wx/module.h"
-#include "wx/dynload.h"
+#include "wx/dynlib.h"
 
 #ifdef wxHAVE_RAW_BITMAP
 #include "wx/rawbmp.h"
 #endif
 
 #include <string.h>
-#include <math.h>
-
-#if wxUSE_COMMON_DIALOGS && !defined(__WXMICROWIN__)
-    #include <commdlg.h>
-#endif
 
+#include "wx/msw/wrapcdlg.h"
 #ifndef __WIN32__
     #include <print.h>
 #endif
@@ -93,11 +83,6 @@ static const int VIEWPORT_EXTENT = 1000;
 static const int MM_POINTS = 9;
 static const int MM_METRIC = 10;
 
-// usually this is defined in math.h
-#ifndef M_PI
-    static const double M_PI = 3.14159265358979323846;
-#endif // M_PI
-
 // ROPs which don't have standard names (see "Ternary Raster Operations" in the
 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
 #define DSTCOPY 0x00AA0029      // a.k.a. NOP operation
@@ -114,10 +99,10 @@ static const int MM_METRIC = 10;
  */
 
 #ifdef __WXWINCE__
-    #define XLOG2DEV(x) ((x-m_logicalOriginX)*m_signX+m_deviceOriginX)
-    #define YLOG2DEV(y) ((y-m_logicalOriginY)*m_signY+m_deviceOriginY)
-    #define XDEV2LOG(x) ((x-m_deviceOriginX)*m_signX+m_logicalOriginX)
-    #define YDEV2LOG(y) ((y-m_deviceOriginY)*m_signY+m_logicalOriginY)
+    #define XLOG2DEV(x) ((x-m_logicalOriginX)*m_signX)
+    #define YLOG2DEV(y) ((y-m_logicalOriginY)*m_signY)
+    #define XDEV2LOG(x) ((x)*m_signX+m_logicalOriginX)
+    #define YDEV2LOG(y) ((y)*m_signY+m_logicalOriginY)
 #else
     #define XLOG2DEV(x) (x)
     #define YLOG2DEV(y) (y)
@@ -142,14 +127,17 @@ static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
 // otherwise
 static bool AlphaBlt(HDC hdcDst,
                      int x, int y, int w, int h,
-                     HDC hdcSrc,
+                     int srcX, int srcY, HDC hdcSrc,
                      const wxBitmap& bmpSrc);
 
 #ifdef wxHAVE_RAW_BITMAP
-// our (limited) AlphaBlend() replacement
+
+// our (limited) AlphaBlend() replacement for Windows versions not providing it
 static void
-wxAlphaBlend(HDC hdcDst, int x, int y, int w, int h, const wxBitmap& bmp);
-#endif
+wxAlphaBlend(HDC hdcDst, int x, int y, int w, int h,
+             int srcX, int srcY, const wxBitmap& bmp);
+
+#endif // wxHAVE_RAW_BITMAP
 
 // ----------------------------------------------------------------------------
 // private classes
@@ -181,7 +169,8 @@ private:
 class StretchBltModeChanger
 {
 public:
-    StretchBltModeChanger(HDC hdc, int mode)
+    StretchBltModeChanger(HDC hdc,
+                          int WXUNUSED_IN_WINCE(mode))
         : m_hdc(hdc)
     {
 #ifndef __WXWINCE__
@@ -207,6 +196,37 @@ private:
     DECLARE_NO_COPY_CLASS(StretchBltModeChanger)
 };
 
+// support for dynamic loading of msimg32.dll which we use for some functions
+class wxMSImg32DLL
+{
+public:
+    // return the symbol with the given name if the DLL not loaded or symbol
+    // not present
+    static void *GetSymbol(const wxChar *name)
+    {
+        wxLogNull noLog;
+
+        if ( !ms_triedToLoad )
+        {
+            ms_triedToLoad = true;
+            ms_dll.Load(_T("msimg32"));
+        }
+
+        return ms_dll.IsLoaded() ? ms_dll.GetSymbol(name) : NULL;
+    }
+
+private:
+    static wxDynamicLibrary ms_dll;
+    static bool ms_triedToLoad;
+};
+
+wxDynamicLibrary wxMSImg32DLL::ms_dll;
+bool wxMSImg32DLL::ms_triedToLoad = false;
+
+// helper macro for getting the symbols from msimg32.dll: it supposes that a
+// type "name_t" is defined and casts the returned symbol to it automatically
+#define wxMSIMG32_SYMBOL(name) (name ## _t)wxMSImg32DLL::GetSymbol(_T(#name))
+
 // ===========================================================================
 // implementation
 // ===========================================================================
@@ -224,7 +244,7 @@ wxColourChanger::wxColourChanger(wxDC& dc) : m_dc(dc)
         m_colFgOld = ::GetTextColor(hdc);
         m_colBgOld = ::GetBkColor(hdc);
 
-        // note that Windows convention is opposite to wxWindows one, this is
+        // note that Windows convention is opposite to wxWidgets one, this is
         // why text colour becomes the background one and vice versa
         const wxColour& colFg = dc.GetTextForeground();
         if ( colFg.Ok() )
@@ -269,23 +289,6 @@ wxColourChanger::~wxColourChanger()
 // wxDC
 // ---------------------------------------------------------------------------
 
-// Default constructor
-wxDC::wxDC()
-{
-    m_canvas = NULL;
-
-    m_oldBitmap = 0;
-    m_oldPen = 0;
-    m_oldBrush = 0;
-    m_oldFont = 0;
-#if wxUSE_PALETTE
-    m_oldPalette = 0;
-#endif // wxUSE_PALETTE
-
-    m_bOwnsDC = false;
-    m_hDC = 0;
-}
-
 wxDC::~wxDC()
 {
     if ( m_hDC != 0 )
@@ -383,6 +386,24 @@ void wxDC::UpdateClipBox()
     m_clipY2 = (wxCoord) YDEV2LOG(rect.bottom);
 }
 
+void
+wxDC::DoGetClippingBox(wxCoord *x, wxCoord *y, wxCoord *w, wxCoord *h) const
+{
+    // check if we should try to retrieve the clipping region possibly not set
+    // by our SetClippingRegion() but preset by Windows:this can only happen
+    // when we're associated with an existing HDC usign SetHDC(), see there
+    if ( m_clipping && !m_clipX1 && !m_clipX2 )
+    {
+        wxDC *self = wxConstCast(this, wxDC);
+        self->UpdateClipBox();
+
+        if ( !m_clipX1 && !m_clipX2 )
+            self->m_clipping = false;
+    }
+
+    wxDCBase::DoGetClippingBox(x, y, w, h);
+}
+
 // common part of DoSetClippingRegion() and DoSetClippingRegionAsRegion()
 void wxDC::SetClippingHrgn(WXHRGN hrgn)
 {
@@ -398,6 +419,12 @@ void wxDC::SetClippingHrgn(WXHRGN hrgn)
     if ( !::GetClipBox(GetHdc(), &rectClip) )
         return;
 
+    // GetClipBox returns logical coordinates, so transform to device
+    rectClip.left = LogicalToDeviceX(rectClip.left);
+    rectClip.top = LogicalToDeviceY(rectClip.top);
+    rectClip.right = LogicalToDeviceX(rectClip.right);
+    rectClip.bottom = LogicalToDeviceY(rectClip.bottom);
+
     HRGN hrgnDest = ::CreateRectRgn(0, 0, 0, 0);
     HRGN hrgnClipOld = ::CreateRectRgn(rectClip.left, rectClip.top,
                                        rectClip.right, rectClip.bottom);
@@ -456,6 +483,14 @@ void wxDC::DestroyClippingRegion()
 
     if (m_clipping && m_hDC)
     {
+#if 1
+        // On a PocketPC device (not necessarily emulator), resetting
+        // the clip region as per the old method causes bad display
+        // problems. In fact setting a null region is probably OK
+        // on desktop WIN32 also, since the WIN32 docs imply that the user
+        // clipping region is independent from the paint clipping region.
+        ::SelectClipRgn(GetHdc(), 0);
+#else        
         // 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
@@ -463,9 +498,10 @@ void wxDC::DestroyClippingRegion()
         HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
         ::SelectClipRgn(GetHdc(), rgn);
         ::DeleteObject(rgn);
+#endif        
     }
 
-    m_clipping = false;
+    wxDCBase::DestroyClippingRegion();
 }
 
 // ---------------------------------------------------------------------------
@@ -532,10 +568,10 @@ void wxDC::Clear()
     ::FillRect(GetHdc(), &rect, brush);
     ::DeleteObject(brush);
 
+#ifndef __WXWINCE__
     int width = DeviceToLogicalXRel(VIEWPORT_EXTENT)*m_signX,
         height = DeviceToLogicalYRel(VIEWPORT_EXTENT)*m_signY;
 
-#ifndef __WXWINCE__
     ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
 
     ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
@@ -545,12 +581,14 @@ void wxDC::Clear()
 #endif
 }
 
-bool wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
+bool wxDC::DoFloodFill(wxCoord WXUNUSED_IN_WINCE(x),
+                       wxCoord WXUNUSED_IN_WINCE(y),
+                       const wxColour& WXUNUSED_IN_WINCE(col),
+                       int WXUNUSED_IN_WINCE(style))
 {
 #ifdef __WXWINCE__
     return false;
 #else
-
     WXMICROWIN_CHECK_HDC_RET(false)
 
     bool success = (0 != ::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
@@ -739,7 +777,11 @@ void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
     CalcBoundingBox(x, 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 WXUNUSED_IN_WINCE(fillStyle))
 {
     WXMICROWIN_CHECK_HDC
 
@@ -792,7 +834,7 @@ wxDC::DoDrawPolyPolygon(int n,
 {
 #ifdef __WXWINCE__
     wxDCBase::DoDrawPolyPolygon(n, count, points, xoffset, yoffset, fillStyle);
-#else    
+#else
     WXMICROWIN_CHECK_HDC
 
     wxColourChanger cc(*this); // needed for wxSTIPPLE_MASK_OPAQUE handling
@@ -813,11 +855,11 @@ wxDC::DoDrawPolyPolygon(int n,
         }
 #ifndef __WXWINCE__
         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
-#endif        
+#endif
         (void)PolyPolygon(GetHdc(), cpoints, count, n);
 #ifndef __WXWINCE__
         SetPolyFillMode(GetHdc(),prev);
-#endif        
+#endif
         delete[] cpoints;
     }
     else
@@ -827,11 +869,11 @@ wxDC::DoDrawPolyPolygon(int n,
 
 #ifndef __WXWINCE__
         int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
-#endif        
+#endif
         (void)PolyPolygon(GetHdc(), (POINT*) points, count, n);
 #ifndef __WXWINCE__
         SetPolyFillMode(GetHdc(),prev);
-#endif        
+#endif
     }
 #endif
   // __WXWINCE__
@@ -893,8 +935,11 @@ void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
         // I wonder if this shouldn´t be done after the LOG2DEV() conversions. RR.
         if ( m_pen.GetStyle() == wxTRANSPARENT )
         {
+            // Apparently not needed for WinCE (see e.g. Life! demo)
+#ifndef __WXWINCE__
             x2++;
             y2++;
+#endif
         }
 
         (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
@@ -954,6 +999,105 @@ void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
     CalcBoundingBox(x2, y2);
 }
 
+#if wxUSE_SPLINES
+void wxDC::DoDrawSpline(wxList *points)
+{
+#ifdef  __WXWINCE__
+    // WinCE does not support ::PolyBezier so use generic version
+    wxDCBase::DoDrawSpline(points);
+#else
+    // quadratic b-spline to cubic bezier spline conversion
+    //
+    // quadratic spline with control points P0,P1,P2
+    // P(s) = P0*(1-s)^2 + P1*2*(1-s)*s + P2*s^2
+    //
+    // bezier spline with control points B0,B1,B2,B3
+    // B(s) = B0*(1-s)^3 + B1*3*(1-s)^2*s + B2*3*(1-s)*s^2 + B3*s^3
+    //
+    // control points of bezier spline calculated from b-spline
+    // B0 = P0
+    // B1 = (2*P1 + P0)/3
+    // B2 = (2*P1 + P2)/3
+    // B3 = P2
+
+    WXMICROWIN_CHECK_HDC
+
+    wxASSERT_MSG( points, wxT("NULL pointer to spline points?") );
+
+    const size_t n_points = points->GetCount();
+    wxASSERT_MSG( n_points > 2 , wxT("incomplete list of spline points?") );
+
+    const size_t n_bezier_points = n_points * 3 + 1;
+    POINT *lppt = (POINT *)malloc(n_bezier_points*sizeof(POINT));
+    size_t bezier_pos = 0;
+    wxCoord x1, y1, x2, y2, cx1, cy1, cx4, cy4;
+
+    wxList::compatibility_iterator node = points->GetFirst();
+    wxPoint *p = (wxPoint *)node->GetData();
+    lppt[ bezier_pos ].x = x1 = p->x;
+    lppt[ bezier_pos ].y = y1 = p->y;
+    bezier_pos++;
+    lppt[ bezier_pos ] = lppt[ bezier_pos-1 ];
+    bezier_pos++;
+
+    node = node->GetNext();
+    p = (wxPoint *)node->GetData();
+
+    x2 = p->x;
+    y2 = p->y;
+    cx1 = ( x1 + x2 ) / 2;
+    cy1 = ( y1 + y2 ) / 2;
+    lppt[ bezier_pos ].x = XLOG2DEV(cx1);
+    lppt[ bezier_pos ].y = YLOG2DEV(cy1);
+    bezier_pos++;
+    lppt[ bezier_pos ] = lppt[ bezier_pos-1 ];
+    bezier_pos++;
+
+#if !wxUSE_STL
+    while ((node = node->GetNext()) != NULL)
+#else
+    while ((node = node->GetNext()))
+#endif // !wxUSE_STL
+    {
+        p = (wxPoint *)node->GetData();
+        x1 = x2;
+        y1 = y2;
+        x2 = p->x;
+        y2 = p->y;
+        cx4 = (x1 + x2) / 2;
+        cy4 = (y1 + y2) / 2;
+        // B0 is B3 of previous segment
+        // B1:
+        lppt[ bezier_pos ].x = XLOG2DEV((x1*2+cx1)/3);
+        lppt[ bezier_pos ].y = YLOG2DEV((y1*2+cy1)/3);
+        bezier_pos++;
+        // B2:
+        lppt[ bezier_pos ].x = XLOG2DEV((x1*2+cx4)/3);
+        lppt[ bezier_pos ].y = YLOG2DEV((y1*2+cy4)/3);
+        bezier_pos++;
+        // B3:
+        lppt[ bezier_pos ].x = XLOG2DEV(cx4);
+        lppt[ bezier_pos ].y = YLOG2DEV(cy4);
+        bezier_pos++;
+        cx1 = cx4;
+        cy1 = cy4;
+    }
+
+    lppt[ bezier_pos ] = lppt[ bezier_pos-1 ];
+    bezier_pos++;
+    lppt[ bezier_pos ].x = XLOG2DEV(x2);
+    lppt[ bezier_pos ].y = YLOG2DEV(y2);
+    bezier_pos++;
+    lppt[ bezier_pos ] = lppt[ bezier_pos-1 ];
+    bezier_pos++;
+
+    ::PolyBezier( GetHdc(), lppt, bezier_pos );
+
+    free(lppt);
+#endif
+}
+#endif
+
 // 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)
 {
@@ -1041,7 +1185,7 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
         MemoryHDC hdcMem;
         SelectInHDC select(hdcMem, GetHbitmapOf(bmp));
 
-        if ( AlphaBlt(GetHdc(), x, y, width, height, hdcMem, bmp) )
+        if ( AlphaBlt(GetHdc(), x, y, width, height, 0, 0, hdcMem, bmp) )
             return;
     }
 
@@ -1064,7 +1208,7 @@ void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask
         // use MaskBlt() with ROP which doesn't do anything to dst in the mask
         // points
         // On some systems, MaskBlt succeeds yet is much much slower
-        // than the wxWindows fall-back implementation. So we need
+        // than the wxWidgets fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
         bool ok = false;
 #if wxUSE_SYSTEM_OPTIONS
@@ -1266,13 +1410,13 @@ void wxDC::DoDrawRotatedText(const wxString& text,
 
         // "upper left" and "upper right"
         CalcBoundingBox(x, y);
-        CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(h*sin(rad)));
+        CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
 
         // "bottom left" and "bottom right"
         x += (wxCoord)(h*sin(rad));
         y += (wxCoord)(h*cos(rad));
         CalcBoundingBox(x, y);
-        CalcBoundingBox(x + wxCoord(h*sin(rad)), y + wxCoord(h*cos(rad)));
+        CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
     }
 #endif
 }
@@ -1611,7 +1755,7 @@ void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
     SIZE sizeRect;
     TEXTMETRIC tm;
 
-    GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect);
+    ::GetTextExtentPoint32(GetHdc(), string, string.length(), &sizeRect);
     GetTextMetrics(GetHdc(), &tm);
 
     if (x)
@@ -1639,7 +1783,7 @@ bool wxDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) con
     static int maxWidth = -1;
     int fit = 0;
     SIZE sz = {0,0};
-    int stlen = text.Length();
+    int stlen = text.length();
 
     if (maxLenText == -1)
     {
@@ -1651,6 +1795,8 @@ bool wxDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) con
 
     widths.Empty();
     widths.Add(0, stlen);  // fill the array with zeros
+    if (stlen == 0)
+        return true;
 
     if (!::GetTextExtentExPoint(GetHdc(),
                                 text.c_str(),           // string to check
@@ -1747,18 +1893,17 @@ void wxDC::SetUserScale(double x, double y)
 {
     WXMICROWIN_CHECK_HDC
 
-#ifndef __WXWINCE__
     if ( x == m_userScaleX && y == m_userScaleY )
         return;
 
     m_userScaleX = x;
     m_userScaleY = y;
 
-    SetMapMode(m_mappingMode);
-#endif
+    this->SetMapMode(m_mappingMode);
 }
 
-void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
+void wxDC::SetAxisOrientation(bool WXUNUSED_IN_WINCE(xLeftRight),
+                              bool WXUNUSED_IN_WINCE(yBottomUp))
 {
     WXMICROWIN_CHECK_HDC
 
@@ -1816,9 +1961,7 @@ void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
     m_deviceOriginX = x;
     m_deviceOriginY = y;
 
-#ifndef __WXWINCE__
     ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
-#endif
 }
 
 // ---------------------------------------------------------------------------
@@ -1883,11 +2026,14 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
 
     WXMICROWIN_CHECK_HDC_RET(false)
 
+    // if either the source or destination has alpha channel, we must use
+    // AlphaBlt() as other function don't handle it correctly
     const wxBitmap& bmpSrc = source->m_selectedBitmap;
-    if ( bmpSrc.Ok() && bmpSrc.HasAlpha() )
+    if ( bmpSrc.Ok() && (bmpSrc.HasAlpha() ||
+            (m_selectedBitmap.Ok() && m_selectedBitmap.HasAlpha())) )
     {
         if ( AlphaBlt(GetHdc(), xdest, ydest, width, height,
-                      GetHdcOf(*source), bmpSrc) )
+                      xsrc, ysrc, GetHdcOf(*source), bmpSrc) )
             return true;
     }
 
@@ -1955,7 +2101,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
         // of the mask which is also contrary to the Windows one)
 
         // On some systems, MaskBlt succeeds yet is much much slower
-        // than the wxWindows fall-back implementation. So we need
+        // than the wxWidgets fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
 #if wxUSE_SYSTEM_OPTIONS
         if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
@@ -2100,7 +2246,7 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
                     // On Win9x this API fails most (all?) of the time, so
                     // logging it becomes quite distracting.  Since it falls
                     // back to the code below this is not really serious, so
-                    // don't log it.                     
+                    // don't log it.
                     //wxLogLastError(wxT("StretchDIBits"));
                 }
                 else
@@ -2162,12 +2308,14 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
     return success;
 }
 
-void wxDC::DoGetSize(int *w, int *h) const
+void wxDC::GetDeviceSize(int *width, int *height) const
 {
     WXMICROWIN_CHECK_HDC
 
-    if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
-    if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
+    if ( width )
+        *width = ::GetDeviceCaps(GetHdc(), HORZRES);
+    if ( height )
+        *height = ::GetDeviceCaps(GetHdc(), VERTRES);
 }
 
 void wxDC::DoGetSizeMM(int *w, int *h) const
@@ -2202,7 +2350,7 @@ void wxDC::DoGetSizeMM(int *w, int *h) const
 
 wxSize wxDC::GetPPI() const
 {
-    WXMICROWIN_CHECK_HDC_RET(wxSize())
+    WXMICROWIN_CHECK_HDC_RET(wxSize(0,0))
 
     int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
     int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
@@ -2210,7 +2358,7 @@ wxSize wxDC::GetPPI() const
     return wxSize(x, y);
 }
 
-// For use by wxWindows only, unless custom units are required.
+// For use by wxWidgets only, unless custom units are required.
 void wxDC::SetLogicalScale(double x, double y)
 {
     WXMICROWIN_CHECK_HDC
@@ -2362,7 +2510,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule)
 
 static bool AlphaBlt(HDC hdcDst,
                      int x, int y, int width, int height,
-                     HDC hdcSrc,
+                     int srcX, int srcY, HDC hdcSrc,
                      const wxBitmap& bmp)
 {
     wxASSERT_MSG( bmp.Ok() && bmp.HasAlpha(), _T("AlphaBlt(): invalid bitmap") );
@@ -2375,32 +2523,7 @@ static bool AlphaBlt(HDC hdcDst,
                                         HDC,int,int,int,int,
                                         BLENDFUNCTION);
 
-    // bitmaps can be drawn only from GUI thread so there is no need to
-    // protect this static variable from multiple threads
-    static bool s_triedToLoad = false;
-    static AlphaBlend_t pfnAlphaBlend = NULL;
-    if ( !s_triedToLoad )
-    {
-        s_triedToLoad = true;
-
-        // don't give errors about the DLL being unavailable, we're
-        // prepared to handle this
-        wxLogNull nolog;
-
-        wxDynamicLibrary dll(_T("msimg32.dll"));
-        if ( dll.IsLoaded() )
-        {
-            pfnAlphaBlend = (AlphaBlend_t)dll.GetSymbol(_T("AlphaBlend"));
-            if ( pfnAlphaBlend )
-            {
-                // we must keep the DLL loaded if we want to be able to
-                // call AlphaBlend() so just never unload it at all, not a
-                // big deal
-                dll.Detach();
-            }
-        }
-    }
-
+    static AlphaBlend_t pfnAlphaBlend = wxMSIMG32_SYMBOL(AlphaBlend);
     if ( pfnAlphaBlend )
     {
         BLENDFUNCTION bf;
@@ -2410,7 +2533,7 @@ static bool AlphaBlt(HDC hdcDst,
         bf.AlphaFormat = AC_SRC_ALPHA;
 
         if ( pfnAlphaBlend(hdcDst, x, y, width, height,
-                           hdcSrc, 0, 0, width, height,
+                           hdcSrc, srcX, srcY, width, height,
                            bf) )
         {
             // skip wxAlphaBlend() call below
@@ -2419,17 +2542,20 @@ static bool AlphaBlt(HDC hdcDst,
 
         wxLogLastError(_T("AlphaBlend"));
     }
+#else
+    wxUnusedVar(hdcSrc);
 #endif // defined(AC_SRC_OVER)
 
     // AlphaBlend() unavailable of failed: use our own (probably much slower)
     // implementation
 #ifdef wxHAVE_RAW_BITMAP
-    wxAlphaBlend(hdcDst, x, y, width, height, bmp);
+    wxAlphaBlend(hdcDst, x, y, width, height, srcX, srcY, bmp);
 
     return true;
 #else // !wxHAVE_RAW_BITMAP
     // no wxAlphaBlend() neither, fall back to using simple BitBlt() (we lose
     // alpha but at least something will be shown like this)
+    wxUnusedVar(bmp);
     return false;
 #endif // wxHAVE_RAW_BITMAP
 }
@@ -2439,14 +2565,16 @@ static bool AlphaBlt(HDC hdcDst,
 #ifdef wxHAVE_RAW_BITMAP
 
 static void
-wxAlphaBlend(HDC hdcDst, int xDst, int yDst, int w, int h, const wxBitmap& bmpSrc)
+wxAlphaBlend(HDC hdcDst, int xDst, int yDst,
+             int w, int h,
+             int srcX, int srcY, const wxBitmap& bmpSrc)
 {
     // get the destination DC pixels
     wxBitmap bmpDst(w, h, 32 /* force creating RGBA DIB */);
     MemoryHDC hdcMem;
     SelectInHDC select(hdcMem, GetHbitmapOf(bmpDst));
 
-    if ( !::BitBlt(hdcMem, 0, 0, w, h, hdcDst, 0, 0, SRCCOPY) )
+    if ( !::BitBlt(hdcMem, 0, 0, w, h, hdcDst, xDst, yDst, SRCCOPY) )
     {
         wxLogLastError(_T("BitBlt"));
     }
@@ -2461,6 +2589,8 @@ wxAlphaBlend(HDC hdcDst, int xDst, int yDst, int w, int h, const wxBitmap& bmpSr
     wxAlphaPixelData::Iterator pDst(dataDst),
                                pSrc(dataSrc);
 
+    pSrc.Offset(dataSrc, srcX, srcY);
+
     for ( int y = 0; y < h; y++ )
     {
         wxAlphaPixelData::Iterator pDstRowStart = pDst,
@@ -2494,3 +2624,68 @@ wxAlphaBlend(HDC hdcDst, int xDst, int yDst, int w, int h, const wxBitmap& bmpSr
 }
 
 #endif // #ifdef wxHAVE_RAW_BITMAP
+
+void wxDC::DoGradientFillLinear (const wxRect& rect,
+                                 const wxColour& initialColour,
+                                 const wxColour& destColour,
+                                 wxDirection nDirection)
+{
+    // use native function if we have compile-time support it and can load it
+    // during run-time (linking to it statically would make the program
+    // unusable on earlier Windows versions)
+#if defined(GRADIENT_FILL_RECT_H) && wxUSE_DYNLIB_CLASS
+    typedef BOOL
+        (WINAPI *GradientFill_t)(HDC, PTRIVERTEX, ULONG, PVOID, ULONG, ULONG);
+    static GradientFill_t pfnGradientFill = wxMSIMG32_SYMBOL(GradientFill);
+
+    if ( pfnGradientFill )
+    {
+        GRADIENT_RECT grect;
+        grect.UpperLeft = 0;
+        grect.LowerRight = 1;
+
+        // invert colours direction if not filling from left-to-right or
+        // top-to-bottom
+        int firstVertex = nDirection == wxNORTH || nDirection == wxWEST ? 1 : 0;
+
+        // one vertex for upper left and one for upper-right
+        TRIVERTEX vertices[2];
+
+        vertices[0].x = rect.GetLeft();
+        vertices[0].y = rect.GetTop();
+        vertices[1].x = rect.GetRight();
+        vertices[1].y = rect.GetBottom();
+
+        vertices[firstVertex].Red = (COLOR16)(initialColour.Red() << 8);
+        vertices[firstVertex].Green = (COLOR16)(initialColour.Green() << 8);
+        vertices[firstVertex].Blue = (COLOR16)(initialColour.Blue() << 8);
+        vertices[firstVertex].Alpha = 0;
+        vertices[1 - firstVertex].Red = (COLOR16)(destColour.Red() << 8);
+        vertices[1 - firstVertex].Green = (COLOR16)(destColour.Green() << 8);
+        vertices[1 - firstVertex].Blue = (COLOR16)(destColour.Blue() << 8);
+        vertices[1 - firstVertex].Alpha = 0;
+
+        if (nDirection == wxWEST ||
+            nDirection == wxEAST)
+        if ( (*pfnGradientFill)
+             (
+                GetHdc(),
+                vertices,
+                WXSIZEOF(vertices),
+                &grect,
+                1,
+                nDirection == wxWEST || nDirection == wxEAST
+                    ? GRADIENT_FILL_RECT_H
+                    : GRADIENT_FILL_RECT_V
+             ) )
+        {
+            // skip call of the base class version below
+            return;
+        }
+
+        wxLogLastError(_T("GradientFill"));
+    }
+#endif // wxUSE_DYNLIB_CLASS
+
+    wxDCBase::DoGradientFillLinear(rect, initialColour, destColour, nDirection);
+}