GUAC-1305: Implement detection of browser WebP support and add new image mimetype to handshake which will include any non-standard image encodings supported.

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

@@ -183,6 +183,13 @@ public class ConfiguredGuacamoleSocket implements GuacamoleSocket {
                     info.getVideoMimetypes().toArray(new String[0])
                 ));
 
+        // Send supported image formats
+        writer.writeInstruction(
+                new GuacamoleInstruction(
+                    "image",
+                    info.getImageMimetypes().toArray(new String[0])
+                ));
+
         // Send args
         writer.writeInstruction(new GuacamoleInstruction("connect", arg_values));
 

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

@@ -55,10 +55,15 @@ public class GuacamoleClientInformation {
     private final List<String> audioMimetypes = new ArrayList<String>();
 
     /**
-     * The list of audio mimetypes reported by the client to be supported.
+     * The list of video mimetypes reported by the client to be supported.
      */
     private final List<String> videoMimetypes = new ArrayList<String>();
 
+    /**
+     * The list of image mimetypes reported by the client to be supported.
+     */
+    private final List<String> imageMimetypes = new ArrayList<String>();
+
     /**
      * Returns the optimal screen width requested by the client, in pixels.
      * @return The optimal screen width requested by the client, in pixels.
@@ -133,4 +138,15 @@ public class GuacamoleClientInformation {
         return videoMimetypes;
     }
 
+    /**
+     * Returns the list of image mimetypes supported by the client. To add or
+     * removed supported mimetypes, the list returned by this function can be
+     * modified.
+     *
+     * @return The set of video mimetypes supported by the client.
+     */
+    public List<String> getImageMimetypes() {
+        return imageMimetypes;
+    }
+
 }