Add support for DPI within size instruction and client info.

guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/ConfiguredGuacamoleSocket.java

@@ -149,7 +149,8 @@ public class ConfiguredGuacamoleSocket implements GuacamoleSocket {
             new GuacamoleInstruction(
                 "size",
                 Integer.toString(info.getOptimalScreenWidth()),
-                Integer.toString(info.getOptimalScreenHeight())
+                Integer.toString(info.getOptimalScreenHeight()),
+                Integer.toString(info.getOptimalResolution())
             )
         );
 

guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleClientInformation.java

@@ -59,14 +59,19 @@ public class GuacamoleClientInformation {
     private int optimalScreenHeight = 768;
 
     /**
-     * The list of audio mimetypes reported by the client to be supported.
+     * The resolution of the optimal dimensions given, in DPI.
      */
-    private List<String> audioMimetypes = new ArrayList<String>();
+    private int optimalResolution = 96;
 
     /**
      * The list of audio mimetypes reported by the client to be supported.
      */
-    private List<String> videoMimetypes = new ArrayList<String>();
+    private final List<String> audioMimetypes = new ArrayList<String>();
+
+    /**
+     * The list of audio mimetypes reported by the client to be supported.
+     */
+    private final List<String> videoMimetypes = new ArrayList<String>();
 
     /**
      * Returns the optimal screen width requested by the client, in pixels.
@@ -100,6 +105,26 @@ public class GuacamoleClientInformation {
         this.optimalScreenHeight = optimalScreenHeight;
     }
 
+    /**
+     * Returns the resolution of the screen if the optimal width and height are
+     * used, in DPI.
+     * 
+     * @return The optimal screen resolution.
+     */
+    public int getOptimalResolution() {
+        return optimalResolution;
+    }
+
+    /**
+     * Sets the resolution of the screen if the optimal width and height are
+     * used, in DPI.
+     * 
+     * @param optimalResolution The optimal screen resolution in DPI.
+     */
+    public void setOptimalResolution(int optimalResolution) {
+        this.optimalResolution = optimalResolution;
+    }
+
     /**
      * Returns the list of audio mimetypes supported by the client. To add or
      * removed supported mimetypes, the list returned by this function can be

guacamole/src/main/java/org/glyptodon/guacamole/net/basic/BasicTunnelRequestUtility.java

@@ -251,6 +251,11 @@ public class BasicTunnelRequestUtility {
         if (height != null)
             info.setOptimalScreenHeight(Integer.parseInt(height));
 
+        // Set resolution if provided
+        String dpi = request.getParameter("dpi");
+        if (dpi != null)
+            info.setOptimalResolution(Integer.parseInt(dpi));
+
         // Add audio mimetypes
         String[] audio_mimetypes = request.getParameterValues("audio");
         if (audio_mimetypes != null)

guacamole/src/main/webapp/client.xhtml

@@ -105,8 +105,10 @@
                     try {
 
                         // Calculate optimal width/height for display
-                        var optimal_width = window.innerWidth;
+                        var pixel_density = window.devicePixelRatio || 1;
-                        var optimal_height = window.innerHeight;
+                        var optimal_dpi = pixel_density * 96;
+                        var optimal_width = window.innerWidth * pixel_density;
+                        var optimal_height = window.innerHeight * pixel_density;
 
                         // Scale width/height to be at least 600x600
                         if (optimal_width < 600 || optimal_height < 600) {
@@ -123,7 +125,8 @@
                         var connect_string =
                             window.location.search.substring(1)
                             + "&width="  + optimal_width
-                            + "&height=" + optimal_height;
+                            + "&height=" + optimal_height
+                            + "&dpi="    + optimal_dpi;
 
                         // Add audio mimetypes to connect_string
                         GuacUI.Audio.supported.forEach(function(mimetype) {

guacamole/src/main/webapp/scripts/client-ui.js

@@ -953,7 +953,11 @@ GuacUI.Client.attach = function(guac) {
      */
     window.onresize = function() {
 
-        guac.sendSize(window.innerWidth, window.innerHeight);
+        var pixel_density = window.devicePixelRatio || 1;
+        var width = window.innerWidth * pixel_density;
+        var height = window.innerHeight * pixel_density;
+
+        guac.sendSize(width, height);
         GuacUI.Client.updateDisplayScale();
 
     };