just in case, fallback if not cairo-surface

Change-Id: I5c185f9306f73f787f38566ba5335b5a8f51ee1d

vcl/inc/headless/svpgdi.hxx

@@ -55,7 +55,7 @@ protected:
 
 public:
     GlyphCache& getPlatformGlyphCache();
-    void setDevice(basebmp::BitmapDeviceSharedPtr& rDevice);
+    virtual void setDevice(basebmp::BitmapDeviceSharedPtr& rDevice);
     void BlendTextColor(const basebmp::Color &rTextColor, const basebmp::BitmapDeviceSharedPtr &rAlphaMask,
                         const basegfx::B2IPoint &rDstPoint);
 

vcl/inc/unx/gtk/gtkgdi.hxx

@@ -35,8 +35,10 @@ class GtkSalFrame;
 class GtkSalGraphics : public SvpSalGraphics
 {
     GtkSalFrame *mpFrame;
+    bool m_bCairoCompatibleSurface;
 public:
     GtkSalGraphics( GtkSalFrame *pFrame, GtkWidget *pWindow );
+    virtual void        setDevice(basebmp::BitmapDeviceSharedPtr& rDevice) SAL_OVERRIDE;
     virtual void        copyArea( long nDestX, long nDestY,
                                   long nSrcX, long nSrcY,
                                   long nSrcWidth, long nSrcHeight,

vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx

@@ -1576,6 +1576,20 @@ static void print_update_area (GdkWindow *window, const char *msg)
     print_cairo_region (gdk_window_get_update_area (window), msg);
 }
 
+void GtkSalGraphics::setDevice(basebmp::BitmapDeviceSharedPtr& rDevice)
+{
+    SvpSalGraphics::setDevice(rDevice);
+    bool bCairoCompatibleSurface = rDevice->getScanlineFormat() == basebmp::FORMAT_THIRTYTWO_BIT_TC_MASK_BGRX;
+    if (bCairoCompatibleSurface != m_bCairoCompatibleSurface)
+    {
+        if (bCairoCompatibleSurface)
+            m_xTextRenderImpl.reset(new GtkCairoTextRender(*this));
+        else
+            m_xTextRenderImpl.reset(new SvpTextRender(*this));
+        m_bCairoCompatibleSurface = bCairoCompatibleSurface;
+    }
+}
+
 void GtkSalGraphics::copyArea( long nDestX, long nDestY,
                                long nSrcX, long nSrcY,
                                long nSrcWidth, long nSrcHeight,