Full screen fixes (aspect ratio & IE11) & AR opt

Full screen image now has correct aspect ratio (parent of canvas is full
screen root, canvas size is adapted via styles).
Full screen now works properly in Internet Explorer 11.
It is now possible to optionally force a specific aspect ratio for the
canvas (canvas size is adapted via styles, ratio for now has to be set
manually in compiled JS).

AUTHORS

@@ -125,3 +125,4 @@ a license to everyone to use it as detailed in LICENSE.)
 * Sami Vaarala <sami.vaarala@iki.fi>
 * Jack A. Arrington <jack@epicpineapple.com>
 * Richard Janicek <r@janicek.co>
+* Bernhard Fey <e-male@web.de>

src/library_browser.js

@@ -197,24 +197,33 @@ mergeInto(LibraryManager.library, {
       // Canvas event setup
 
       var canvas = Module['canvas'];
+      
+      // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
+      // Module['forcedAspectRatio'] = 4 / 3;
+      
       canvas.requestPointerLock = canvas['requestPointerLock'] ||
                                   canvas['mozRequestPointerLock'] ||
-                                  canvas['webkitRequestPointerLock'];
+                                  canvas['webkitRequestPointerLock'] ||
+                                  canvas['msRequestPointerLock'] ||
+                                  function(){};
       canvas.exitPointerLock = document['exitPointerLock'] ||
                                document['mozExitPointerLock'] ||
                                document['webkitExitPointerLock'] ||
+                               document['msExitPointerLock'] ||
                                function(){}; // no-op if function does not exist
       canvas.exitPointerLock = canvas.exitPointerLock.bind(document);
 
       function pointerLockChange() {
         Browser.pointerLock = document['pointerLockElement'] === canvas ||
                               document['mozPointerLockElement'] === canvas ||
-                              document['webkitPointerLockElement'] === canvas;
+                              document['webkitPointerLockElement'] === canvas ||
+                              document['msPointerLockElement'] === canvas;
       }
 
       document.addEventListener('pointerlockchange', pointerLockChange, false);
       document.addEventListener('mozpointerlockchange', pointerLockChange, false);
       document.addEventListener('webkitpointerlockchange', pointerLockChange, false);
+      document.addEventListener('mspointerlockchange', pointerLockChange, false);
 
       if (Module['elementPointerLock']) {
         canvas.addEventListener("click", function(ev) {
@@ -340,22 +349,35 @@ mergeInto(LibraryManager.library, {
       if (typeof Browser.resizeCanvas === 'undefined') Browser.resizeCanvas = false;
 
       var canvas = Module['canvas'];
+      var canvasContainer = canvas.parentNode;
       function fullScreenChange() {
         Browser.isFullScreen = false;
         if ((document['webkitFullScreenElement'] || document['webkitFullscreenElement'] ||
              document['mozFullScreenElement'] || document['mozFullscreenElement'] ||
-             document['fullScreenElement'] || document['fullscreenElement']) === canvas) {
+             document['fullScreenElement'] || document['fullscreenElement'] ||
+             document['msFullScreenElement'] || document['msFullscreenElement'] ||
+             document['webkitCurrentFullScreenElement']) === canvasContainer) {
           canvas.cancelFullScreen = document['cancelFullScreen'] ||
                                     document['mozCancelFullScreen'] ||
-                                    document['webkitCancelFullScreen'];
+                                    document['webkitCancelFullScreen'] ||
+                                    document['msExitFullscreen'] ||
+                                    document['exitFullscreen'] ||
+                                    function() {};
           canvas.cancelFullScreen = canvas.cancelFullScreen.bind(document);
           if (Browser.lockPointer) canvas.requestPointerLock();
           Browser.isFullScreen = true;
           if (Browser.resizeCanvas) Browser.setFullScreenCanvasSize();
-        } else if (Browser.resizeCanvas){
-          Browser.setWindowedCanvasSize();
+        } else {
+          
+          // remove the full screen specific parent of the canvas again to restore the HTML structure from before going full screen
+          var canvasContainer = canvas.parentNode;
+          canvasContainer.parentNode.insertBefore(canvas, canvasContainer);
+          canvasContainer.parentNode.removeChild(canvasContainer);
+          
+          if (Browser.resizeCanvas) Browser.setWindowedCanvasSize();
         }
         if (Module['onFullScreen']) Module['onFullScreen'](Browser.isFullScreen);
+        Browser.updateCanvasDimensions(canvas);
       }
 
       if (!Browser.fullScreenHandlersInstalled) {
@@ -363,12 +385,20 @@ mergeInto(LibraryManager.library, {
         document.addEventListener('fullscreenchange', fullScreenChange, false);
         document.addEventListener('mozfullscreenchange', fullScreenChange, false);
         document.addEventListener('webkitfullscreenchange', fullScreenChange, false);
+        document.addEventListener('MSFullscreenChange', fullScreenChange, false);
       }
 
-      canvas.requestFullScreen = canvas['requestFullScreen'] ||
-                                 canvas['mozRequestFullScreen'] ||
-                                 (canvas['webkitRequestFullScreen'] ? function() { canvas['webkitRequestFullScreen'](Element['ALLOW_KEYBOARD_INPUT']) } : null);
-      canvas.requestFullScreen();
+      // create a new parent to ensure the canvas has no siblings. this allows browsers to optimize full screen performance when its parent is the full screen root
+      var canvasContainer = document.createElement("div");
+      canvas.parentNode.insertBefore(canvasContainer, canvas);
+      canvasContainer.appendChild(canvas);
+      
+      // use parent of canvas as full screen root to allow aspect ratio correction (Firefox stretches the root to screen size)
+      canvasContainer.requestFullScreen = canvasContainer['requestFullScreen'] ||
+                                          canvasContainer['mozRequestFullScreen'] ||
+                                          canvasContainer['msRequestFullscreen'] ||
+                                         (canvasContainer['webkitRequestFullScreen'] ? function() { canvasContainer['webkitRequestFullScreen'](Element['ALLOW_KEYBOARD_INPUT']) } : null);
+      canvasContainer.requestFullScreen();
     },
 
     requestAnimationFrame: function requestAnimationFrame(func) {
@@ -565,19 +595,13 @@ mergeInto(LibraryManager.library, {
 
     setCanvasSize: function(width, height, noUpdates) {
       var canvas = Module['canvas'];
-      canvas.width = width;
-      canvas.height = height;
+      Browser.updateCanvasDimensions(canvas, width, height);
       if (!noUpdates) Browser.updateResizeListeners();
     },
 
     windowedWidth: 0,
     windowedHeight: 0,
     setFullScreenCanvasSize: function() {
-      var canvas = Module['canvas'];
-      this.windowedWidth = canvas.width;
-      this.windowedHeight = canvas.height;
-      canvas.width = screen.width;
-      canvas.height = screen.height;
       // check if SDL is available   
       if (typeof SDL != "undefined") {
       	var flags = {{{ makeGetValue('SDL.screen+Runtime.QUANTUM_SIZE*0', '0', 'i32', 0, 1) }}};
@@ -588,9 +612,6 @@ mergeInto(LibraryManager.library, {
     },
 
     setWindowedCanvasSize: function() {
-      var canvas = Module['canvas'];
-      canvas.width = this.windowedWidth;
-      canvas.height = this.windowedHeight;
       // check if SDL is available       
       if (typeof SDL != "undefined") {
       	var flags = {{{ makeGetValue('SDL.screen+Runtime.QUANTUM_SIZE*0', '0', 'i32', 0, 1) }}};
@@ -598,7 +619,55 @@ mergeInto(LibraryManager.library, {
       	{{{ makeSetValue('SDL.screen+Runtime.QUANTUM_SIZE*0', '0', 'flags', 'i32') }}}
       }
       Browser.updateResizeListeners();
-    }
+    },
+
+    updateCanvasDimensions : function(canvas, wNative, hNative) {
+        if (wNative && hNative) {
+          canvas.widthNative = wNative;
+          canvas.heightNative = hNative;
+        } else {
+          wNative = canvas.widthNative;
+          hNative = canvas.heightNative;
+        }
+        var w = wNative;
+        var h = hNative;
+        if (Module['forcedAspectRatio'] && Module['forcedAspectRatio'] > 0) {
+          if (w/h < Module['forcedAspectRatio']) {
+            w = Math.round(h * Module['forcedAspectRatio']);
+          } else {
+            h = Math.round(w / Module['forcedAspectRatio']);
+          }
+        }
+        if (((document['webkitFullScreenElement'] || document['webkitFullscreenElement'] ||
+             document['mozFullScreenElement'] || document['mozFullscreenElement'] ||
+             document['fullScreenElement'] || document['fullscreenElement'] ||
+             document['msFullScreenElement'] || document['msFullscreenElement'] ||
+             document['webkitCurrentFullScreenElement']) === canvas.parentNode) && (typeof screen != 'undefined')) {
+           var factor = Math.min(screen.width / w, screen.height / h);
+           w = Math.round(w * factor);
+           h = Math.round(h * factor);
+        }
+        if (Browser.resizeCanvas) {
+          if (canvas.width  != w) canvas.width  = w;
+          if (canvas.height != h) canvas.height = h;
+          if (typeof canvas.style != 'undefined') {
+            canvas.style.removeProperty( "width");
+            canvas.style.removeProperty("height");
+          }
+        } else {
+          if (canvas.width  != wNative) canvas.width  = wNative;
+          if (canvas.height != hNative) canvas.height = hNative;
+          if (typeof canvas.style != 'undefined') {
+            if (w != wNative || h != hNative) {
+              canvas.style.setProperty( "width", w + "px", "important");
+              canvas.style.setProperty("height", h + "px", "important");
+            } else {
+              canvas.style.removeProperty( "width");
+              canvas.style.removeProperty("height");
+            }
+          }
+        }
+      }
 
   },