Add a new test checking wxGraphicsContext implementation correctness.

This test verifies that the output of wxGraphicsContext on the current system
matches the pregenerated reference output.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76164 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/drawing/pluginsample.cpp

@@ -0,0 +1,87 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        tests/drawing/pluginsample.cpp
+// Purpose:     Sample plugin for the wxGraphicsContext test
+// Author:      Armel Asselin
+// Created:     2014-02-21
+// Copyright:   (c) 2014 Ellié Computing <opensource@elliecomputing.com>
+///////////////////////////////////////////////////////////////////////////////
+
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "plugin.h"
+
+#if wxUSE_TEST_GC_DRAWING
+
+// ----------------------------------------------------------------------------
+// plugin implementation
+// ----------------------------------------------------------------------------
+
+class SampleDrawingTestGCFactory: public DrawingTestGCFactory {
+public:
+    SampleDrawingTestGCFactory() {
+        wxImage::AddHandler (new wxBMPHandler());
+    }
+
+    virtual ~SampleDrawingTestGCFactory() {
+    }
+    virtual wxString GetIdForFileName () const { return "sample-plg"; }
+    virtual wxString GetExtensionForFileName () const { return "bmp"; }
+
+    // Bitmaps are handled by wx code they should be binarily equal
+    virtual bool UseImageComparison() const { return false; }
+
+    // We use wxGraphicsContext, its implementation is not platform independent
+    // and returns may slightly vary
+    virtual bool PlatformIndependent() const { return false; }
+
+    virtual wxGraphicsContext *BuildNewContext (wxSize expectedSize,
+        double WXUNUSED(pointsPerInch), const wxFileName &targetFileName) {
+        m_image = new wxImage (expectedSize);
+        m_image->InitAlpha();
+
+        m_targetFileName = targetFileName.GetFullPath();
+
+        // we should probably pass the number of points per inches somewhere...
+        //  but I don't see where yet...
+        return wxGraphicsContext::Create(*m_image);
+    }
+
+    // Let's the opportunity to actually save the context and associated data
+    // If saving requires deleting the wxGraphicsContext object the
+    //  implementer is free to do it but @c gc must then be nulled
+    virtual void SaveBuiltContext (wxGraphicsContext *&gc) {
+        wxDELETE(gc);
+
+        m_image->SaveFile (m_targetFileName);
+    }
+
+    // Cleans @c gc and internal data if any
+    virtual void CleanUp (wxGraphicsContext *gc) {
+        delete gc;
+        m_targetFileName.Empty();
+        wxDELETE(m_image);
+    }
+
+    wxImage *m_image;
+    wxString m_targetFileName;
+};
+
+extern "C" WXEXPORT DrawingTestGCFactory * CreateDrawingTestLifeCycle()
+{
+    return new SampleDrawingTestGCFactory;
+}
+
+extern "C" WXEXPORT void DestroyDrawingTestLifeCycle (DrawingTestGCFactory* lc)
+{
+    delete lc;
+}
+
+#endif // wxUSE_TEST_GC_DRAWING