honour user scale and source offset in wxDC::Blit() (#2605)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55293 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dcclient.h

@@ -119,7 +119,7 @@ public:
 
     void SetUpDC( bool ismem = false );
     void Destroy();
-    
+
     virtual void ComputeScaleAndOrigin();
 
     virtual GdkWindow *GetGDKWindow() const { return m_gdkwindow; }
@@ -127,6 +127,25 @@ public:
 private:
     void DrawingSetup(GdkGC*& gc, bool& originChanged);
 
+    // return true if the rectangle specified by the parameters is entirely
+    // outside of the current clipping region
+    bool IsOutsideOfClippingRegion(int x, int y, int w, int h);
+
+    // remove the current clipping mask and set the clipping region
+    void RemoveClipMask(GdkGC *gc);
+
+    // return the mask equal to the intersection of the original one with the
+    // clipping region
+    GdkBitmap *GetClippedMask(GdkBitmap *mask, int w, int h,
+                              int x, int y,
+                              int xsrcMask, int ysrcMask);
+
+    void DoDrawMonoBitmap(const wxBitmap& bitmap,
+                          int bmp_w, int bmp_h,
+                          int xsrc, int ysrc,
+                          int xdest, int ydest,
+                          int width, int height);
+
     DECLARE_ABSTRACT_CLASS(wxWindowDCImpl)
 };