Merge HIDPI_GL_CANVAS wrapper with OPENGL_GAL implementation.

common/gal/hidpi_gl_canvas.cpp

@@ -37,10 +37,7 @@ HIDPI_GL_CANVAS::HIDPI_GL_CANVAS( wxWindow *parent,
            const wxPalette& palette ) :
     wxGLCanvas( parent, dispAttrs, id, pos, size, style, name, palette )
 {
-#ifdef RETINA_OPENGL_PATCH
-    SetViewWantsBestResolution( true );
-    scaleFactor = GetBackingScaleFactor();
-#endif
+    initialize();
 }
 
 HIDPI_GL_CANVAS::HIDPI_GL_CANVAS( wxWindow *parent,
@@ -53,10 +50,7 @@ HIDPI_GL_CANVAS::HIDPI_GL_CANVAS( wxWindow *parent,
            const wxPalette& palette ) :
     wxGLCanvas( parent, id, attribList, pos, size, style, name, palette )
 {
-#ifdef RETINA_OPENGL_PATCH
-    SetViewWantsBestResolution( true );
-    scaleFactor = GetBackingScaleFactor();
-#endif
+    initialize();
 }
 
 
@@ -65,9 +59,29 @@ wxSize HIDPI_GL_CANVAS::GetClientSize() const
     wxSize size = wxGLCanvas::GetClientSize();
 
 #ifdef RETINA_OPENGL_PATCH
+    const float scaleFactor = GetBackingScaleFactor();
     size.x *= scaleFactor;
     size.y *= scaleFactor;
 #endif
 
     return size;
 }
+
+float HIDPI_GL_CANVAS::GetBackingScaleFactor() const
+{
+#ifdef RETINA_OPENGL_PATCH
+    // this is ugly, but original method isn't marked const although it doesn't modify anything
+    // => clean up when it officially has arrived in wxWidgets
+    return static_cast< wxGLCanvas* >( const_cast< HIDPI_GL_CANVAS* >( this ))->GetBackingScaleFactor();
+#else
+    return 1.0f;
+#endif
+}
+
+
+void HIDPI_GL_CANVAS::initialize()
+{
+#ifdef RETINA_OPENGL_PATCH
+    SetViewWantsBestResolution( true );
+#endif
+}

common/gal/opengl/opengl_gal.cpp

@@ -68,7 +68,7 @@ OPENGL_GAL::OPENGL_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
                         wxEvtHandler* aMouseListener, wxEvtHandler* aPaintListener,
                         const wxString& aName ) :
     GAL( aDisplayOptions ),
-    wxGLCanvas( aParent, wxID_ANY, (int*) glAttributes, wxDefaultPosition, wxDefaultSize,
+    HIDPI_GL_CANVAS( aParent, wxID_ANY, (int*) glAttributes, wxDefaultPosition, wxDefaultSize,
                 wxEXPAND, aName ),
     mouseListener( aMouseListener ), paintListener( aPaintListener ), currentManager( nullptr ),
     cachedManager( nullptr ), nonCachedManager( nullptr ), overlayManager( nullptr )
@@ -96,10 +96,6 @@ OPENGL_GAL::OPENGL_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
     isGrouping               = false;
     groupCounter             = 0;
 
-#ifdef RETINA_OPENGL_PATCH
-    SetViewWantsBestResolution( true );
-#endif
-
     // Connecting the event handlers
     Connect( wxEVT_PAINT,           wxPaintEventHandler( OPENGL_GAL::onPaint ) );
 
@@ -1155,13 +1151,8 @@ void OPENGL_GAL::ResizeScreen( int aWidth, int aHeight )
 {
     screenSize = VECTOR2I( aWidth, aHeight );
 
-#ifdef RETINA_OPENGL_PATCH
-    const float scaleFactor = GetBackingScaleFactor();
-#else
-    const float scaleFactor = 1.0f;
-#endif
-
     // Resize framebuffers
+    const float scaleFactor = GetBackingScaleFactor();
     compositor->Resize( aWidth * scaleFactor, aHeight * scaleFactor );
     isFramebufferInitialized = false;
 

include/gal/hidpi_gl_canvas.h

@@ -40,6 +40,7 @@
 class HIDPI_GL_CANVAS : public wxGLCanvas
 {
 public:
+    // wxGLCanvas constructor
     HIDPI_GL_CANVAS( wxWindow *parent,
                const wxGLAttributes& dispAttrs,
                wxWindowID id = wxID_ANY,
@@ -49,6 +50,7 @@ public:
                const wxString& name = wxGLCanvasName,
                const wxPalette& palette = wxNullPalette );
 
+    // wxGLCanvas constructor
     HIDPI_GL_CANVAS( wxWindow *parent,
                wxWindowID id = wxID_ANY,
                const int *attribList = NULL,
@@ -58,13 +60,19 @@ public:
                const wxString& name = wxGLCanvasName,
                const wxPalette& palette = wxNullPalette );
 
-    wxSize GetClientSize() const;
+
+    // wxGLCanvas override
+    virtual wxSize GetClientSize() const;
+
+    // wxGLCanvas override (with patch applied) or default value of 1.0
+    virtual float GetBackingScaleFactor() const;
 
 
-#ifdef RETINA_OPENGL_PATCH
 private:
-     float scaleFactor;
-#endif
+    /**
+     * @brief Common initialization
+     */
+    void initialize();
 };
 
 #endif // HIDPI_GL_CANVAS_H

include/gal/opengl/opengl_gal.h

@@ -38,8 +38,7 @@
 #include <gal/opengl/cached_container.h>
 #include <gal/opengl/noncached_container.h>
 #include <gal/opengl/opengl_compositor.h>
-
-#include <wx/glcanvas.h>
+#include <gal/hidpi_gl_canvas.h>
 
 #include <unordered_map>
 #include <boost/smart_ptr/shared_array.hpp>
@@ -62,7 +61,7 @@ class SHADER;
  * and quads. The purpose is to provide a fast graphics interface, that takes advantage of modern
  * graphics card GPUs. All methods here benefit thus from the hardware acceleration.
  */
-class OPENGL_GAL : public GAL, public wxGLCanvas
+class OPENGL_GAL : public GAL, public HIDPI_GL_CANVAS
 {
 public:
     /**