WxUtils: Get rid of GetCurrentBitmapLogicalScale

wx now provides the means to query this.

Source/Core/DolphinWX/ISOFile.cpp

@@ -8,11 +8,13 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include <wx/app.h>
 #include <wx/bitmap.h>
 #include <wx/filefn.h>
 #include <wx/gdicmn.h>
 #include <wx/image.h>
 #include <wx/string.h>
+#include <wx/window.h>
 
 #include "Common/ChunkFile.h"
 #include "Common/CommonPaths.h"
@@ -131,7 +133,7 @@ GameListItem::GameListItem(const std::string& _rFileName)
 	if (!m_pImage.empty())
 	{
 		wxImage Image(m_ImageWidth, m_ImageHeight, &m_pImage[0], true);
-		double Scale = WxUtils::GetCurrentBitmapLogicalScale();
+		double Scale = wxTheApp->GetTopWindow()->GetContentScaleFactor();
 		// Note: This uses nearest neighbor, which subjectively looks a lot
 		// better for GC banners than smooths caling.
 		Image.Rescale(DVD_BANNER_WIDTH * Scale, DVD_BANNER_HEIGHT * Scale);

Source/Core/DolphinWX/WxUtils.cpp

@@ -58,18 +58,6 @@ void ShowErrorDialog(const wxString& error_msg)
 	wxMessageBox(error_msg, _("Error"), wxOK | wxICON_ERROR);
 }
 
-double GetCurrentBitmapLogicalScale()
-{
-#ifdef __APPLE__
-	// wx doesn't expose this itself, unfortunately.
-	if ([[NSScreen mainScreen] respondsToSelector:@selector(backingScaleFactor)])
-	{
-		return [[NSScreen mainScreen] backingScaleFactor];
-	}
-#endif
-	return 1.0;
-}
-
 wxBitmap _wxGetBitmapFromMemory(const unsigned char* data, int length)
 {
 	wxMemoryInputStream is(data, length);

Source/Core/DolphinWX/WxUtils.h

@@ -25,8 +25,6 @@ void Explore(const std::string& path);
 // Displays a wxMessageBox geared for errors
 void ShowErrorDialog(const wxString& error_msg);
 
-double GetCurrentBitmapLogicalScale();
-
 wxBitmap _wxGetBitmapFromMemory(const unsigned char* data, int length);
 
 // From a wxBitmap, creates the corresponding disabled version for toolbar buttons