Move cursor URI check to RFB object

Keeps the Display object simpler, and avoids having to abuse a
property to transfer the information.

core/display.js

@@ -10,7 +10,6 @@
 /*jslint browser: true, white: false */
 /*global Util, Base64, changeCursor */
 
-import { browserSupportsCursorURIs as cursorURIsSupported } from './util/browsers.js';
 import { set_defaults, make_properties } from './util/properties.js';
 import * as Log from './util/logging.js';
 import Base64 from "./base64.js";
@@ -77,12 +76,6 @@ export default function Display(target, defaults) {
         throw new Error("Canvas does not support createImageData");
     }
 
-    // Determine browser support for setting the cursor via data URI scheme
-    if (this._cursor_uri || this._cursor_uri === null ||
-            this._cursor_uri === undefined) {
-        this._cursor_uri = cursorURIsSupported();
-    }
-
     Log.Debug("<< Display.constructor");
 };
 
@@ -483,11 +476,6 @@ Display.prototype = {
     },
 
     changeCursor: function (pixels, mask, hotx, hoty, w, h) {
-        if (this._cursor_uri === false) {
-            Log.Warn("changeCursor called but no cursor data URI support");
-            return;
-        }
-
         Display.changeCursor(this._target, pixels, mask, hotx, hoty, w, h);
     },
 
@@ -681,8 +669,6 @@ make_properties(Display, [
     ['width', 'ro', 'int'],        // Display area width
     ['height', 'ro', 'int'],       // Display area height
 
-    ['cursor_uri', 'rw', 'raw'],   // Can we render cursor using data URI
-
     ['onFlush', 'rw', 'func'],     // onFlush(): A flush request has finished
 ]);
 

core/rfb.js

@@ -14,6 +14,7 @@ import * as Log from './util/logging.js';
 import _ from './util/localization.js';
 import { decodeUTF8 } from './util/strings.js';
 import { set_defaults, make_properties } from './util/properties.js';
+import { browserSupportsCursorURIs } from './util/browsers.js';
 import Display from "./display.js";
 import Keyboard from "./input/keyboard.js";
 import Mouse from "./input/mouse.js";
@@ -1470,7 +1471,7 @@ RFB.prototype.set_local_cursor = function (cursor) {
         this._local_cursor = false;
         this._display.disableLocalCursor(); //Only show server-side cursor
     } else {
-        if (this._display.get_cursor_uri()) {
+        if (browserSupportsCursorURIs()) {
             this._local_cursor = true;
         } else {
             Log.Warn("Browser does not support local cursor");

core/util/browsers.js

@@ -43,11 +43,3 @@ export function browserSupportsCursorURIs () {
 
     return _cursor_uris_supported;
 };
-
-export function _forceCursorURIs(enabled) {
-    if (enabled === undefined || enabled) {
-        _cursor_uris_supported = true;
-    } else {
-        _cursor_uris_supported = false;
-    }
-}

docs/API-internal.md

@@ -97,7 +97,6 @@ None
 | viewport    | bool  | RW   | false   | Use viewport clipping
 | width       | int   | RO   |         | Display area width
 | height      | int   | RO   |         | Display area height
-| cursor_uri  | raw   | RW   |         | Can we render cursor using data URI
 
 ### 2.3.2 Methods
 

tests/test.display.js

@@ -3,7 +3,6 @@ var expect = chai.expect;
 
 import Base64 from '../core/base64.js';
 import Display from '../core/display.js';
-import { _forceCursorURIs, browserSupportsCursorURIs } from '../core/util/browsers.js';
 
 import sinon from '../vendor/sinon.js';
 
@@ -37,26 +36,6 @@ describe('Display/Canvas Helper', function () {
         return Base64.decode(data);
     }
 
-    describe('checking for cursor uri support', function () {
-        it('should disable cursor URIs if there is no support', function () {
-            _forceCursorURIs(false);
-            var display = new Display(document.createElement('canvas'), { viewport: false });
-            expect(display._cursor_uri).to.be.false;
-        });
-
-        it('should enable cursor URIs if there is support', function () {
-            _forceCursorURIs(true);
-            var display = new Display(document.createElement('canvas'), { viewport: false });
-            expect(display._cursor_uri).to.be.true;
-        });
-
-        it('respect the cursor_uri option if there is support', function () {
-            _forceCursorURIs(false);
-            var display = new Display(document.createElement('canvas'), { viewport: false, cursor_uri: false });
-            expect(display._cursor_uri).to.be.false;
-        });
-    });
-
     describe('viewport handling', function () {
         var display;
         beforeEach(function () {