0032433: Visualization, TKService - introduce Wasm_Window implementing Aspect_Window interface using Emscripten SDK

Introduced Wasm_Window implementing Aspect_Window interface.

Aspect_WindowInputListener has been extended by touch input callbacks (moved from AIS_ViewController),
which now implements redirection of single taps to UpdateMouseClick().

AIS_ViewController::FetchNavigationKeys() now requests more frames even if Delta is zero,
but navigation keys are pressed - indicated by a new flag AIS_WalkDelta::IsDefined().

Fixed missing implementation of Xw_Window::DisplayConnection() getter.
The property has been moved to the base class Aspect_Window.

Removed unused Aspect_Convert.hxx.

DRAWEXE targeting Wasm:
- added exposing of FS interface so that it is possible uploading/downloading files to/from emulated file system on JavaScript level;
- added printer redirecting messages to Module.printMessage callback accepting message gravity;
- Run_Appli() now skips std::cin when Module.noExitRuntime is set.

src/Aspect/Aspect_Window.hxx

@@ -24,6 +24,7 @@
 #include <Aspect_GradientFillMethod.hxx>
 #include <Aspect_TypeOfResize.hxx>
 #include <Aspect_Drawable.hxx>
+#include <Graphic3d_Vec2.hxx>
 #include <Standard.hxx>
 #include <Standard_Transient.hxx>
 #include <Standard_Type.hxx>
@@ -36,7 +37,7 @@ DEFINE_STANDARD_HANDLE(Aspect_Window, Standard_Transient)
 //! Defines a window.
 class Aspect_Window : public Standard_Transient
 {
-
+  DEFINE_STANDARD_RTTIEXT(Aspect_Window, Standard_Transient)
 public:
 
   //! Modifies the window background.
@@ -102,6 +103,9 @@ public:
   //! Returns native Window FB config (GLXFBConfig on Xlib)
   Standard_EXPORT virtual Aspect_FBConfig NativeFBConfig() const = 0;
 
+  //! Returns connection to Display or NULL.
+  const Handle(Aspect_DisplayConnection)& DisplayConnection() const { return myDisplay; }
+
   //! Sets window title.
   virtual void SetTitle (const TCollection_AsciiString& theTitle) { (void )theTitle; }
 
@@ -114,12 +118,29 @@ public:
   //! on platforms implementing thread-unsafe connections to display.
   //! NULL can be passed instead otherwise.
   virtual void InvalidateContent (const Handle(Aspect_DisplayConnection)& theDisp) { (void )theDisp; }
-  
+
+public:
+
+  //! Return device pixel ratio (logical to backing store scale factor).
+  virtual Standard_Real DevicePixelRatio() const { return 1.0; }
+
+  //! Convert point from logical units into backing store units.
+  virtual Graphic3d_Vec2d ConvertPointToBacking (const Graphic3d_Vec2d& thePnt) const
+  {
+    return thePnt * DevicePixelRatio();
+  }
+
+  //! Convert point from backing store units to logical units.
+  virtual Graphic3d_Vec2d ConvertPointFromBacking (const Graphic3d_Vec2d& thePnt) const
+  {
+    return thePnt / DevicePixelRatio();
+  }
+
+public:
+
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const;
 
-  DEFINE_STANDARD_RTTIEXT(Aspect_Window,Standard_Transient)
-
 protected:
 
   //! Initializes the data of a Window.
@@ -127,6 +148,7 @@ protected:
 
 protected:
 
+  Handle(Aspect_DisplayConnection) myDisplay; //!< Display connection
   Aspect_Background MyBackground;
   Aspect_GradientBackground MyGradientBackground;
   Aspect_FillMethod MyBackgroundFillMethod;