Overhaul IE zoom functions to support both text and optical zoom.

[wxWidgets.git] / include / wx / graphics.h

diff --git a/include/wx/graphics.h b/include/wx/graphics.h
index af132850287a33f472eaa5499129cd9cd46b2820..b79ba6144ca1591841d9345f10f8754ea7e127bd 100644 (file)
--- a/include/wx/graphics.h
+++ b/include/wx/graphics.h
@@ -58,9 +58,11 @@ class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
 #if wxUSE_PRINTING_ARCHITECTURE
 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
 #endif
+#ifdef __WXMSW__
 #if wxUSE_ENH_METAFILE
 class WXDLLIMPEXP_FWD_CORE wxEnhMetaFileDC;
 #endif
+#endif
 class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;
 class WXDLLIMPEXP_FWD_CORE wxGraphicsPath;
 class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrix;
@@ -396,8 +398,10 @@ public:
 #if wxUSE_PRINTING_ARCHITECTURE
     static wxGraphicsContext * Create( const wxPrinterDC& dc);
 #endif
+#ifdef __WXMSW__
 #if wxUSE_ENH_METAFILE
     static wxGraphicsContext * Create( const wxEnhMetaFileDC& dc);
+#endif
 #endif
 
     static wxGraphicsContext* CreateFromNative( void * context );
@@ -499,7 +503,13 @@ public:
     virtual bool SetCompositionMode(wxCompositionMode op) = 0;
 
     // returns the size of the graphics context in device coordinates
-    virtual void GetSize( wxDouble* width, wxDouble* height);
+    void GetSize(wxDouble* width, wxDouble* height)
+    {
+        if ( width )
+            *width = m_width;
+        if ( height )
+            *height = m_height;
+    }
 
     // returns the resolution of the graphics context in device points per inch
     virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
@@ -632,14 +642,25 @@ public:
 
     // helper to determine if a 0.5 offset should be applied for the drawing operation
     virtual bool ShouldOffset() const { return false; }
-
+    
+    // indicates whether the context should try to offset for pixel boundaries, this only makes sense on 
+    // bitmap devices like screen, by default this is turned off
+    virtual void EnableOffset(bool enable = true);
+    
+    void DisableOffset() { EnableOffset(false); }
+    bool OffsetEnabled() { return m_enableOffset; }
+    
 protected:
+    // These fields must be initialized in the derived class ctors.
+    wxDouble m_width,
+             m_height;
 
     wxGraphicsPen m_pen;
     wxGraphicsBrush m_brush;
     wxGraphicsFont m_font;
     wxAntialiasMode m_antialias;
     wxCompositionMode m_composition;
+    bool m_enableOffset;
 
 protected:
     // implementations of overloaded public functions: we use different names
@@ -717,8 +738,10 @@ public:
 #if wxUSE_PRINTING_ARCHITECTURE
     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc) = 0;
 #endif
+#ifdef __WXMSW__
 #if wxUSE_ENH_METAFILE
     virtual wxGraphicsContext * CreateContext( const wxEnhMetaFileDC& dc) = 0;
+#endif
 #endif
 
     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;