Remove render_mode property

It can only have a single value these days, so it is no longer
useful.

core/display.js

@@ -35,7 +35,6 @@ export default function Display(target, defaults) {
     set_defaults(this, defaults, {
         'scale': 1.0,
         'viewport': false,
-        'render_mode': '',
         "onFlush": function () {},
     });
 
@@ -74,9 +73,7 @@ export default function Display(target, defaults) {
     this.clear();
 
     // Check canvas features
-    if ('createImageData' in this._drawCtx) {
-        this._render_mode = 'canvas rendering';
-    } else {
+    if (!('createImageData' in this._drawCtx)) {
         throw new Error("Canvas does not support createImageData");
     }
 
@@ -700,8 +697,6 @@ make_properties(Display, [
     ['width', 'ro', 'int'],        // Display area width
     ['height', 'ro', 'int'],       // Display area height
 
-    ['render_mode', 'ro', 'str'],  // Canvas rendering mode (read-only)
-
     ['prefer_js', 'rw', 'str'],    // Prefer Javascript over canvas methods
     ['cursor_uri', 'rw', 'raw'],   // Can we render cursor using data URI
 

core/rfb.js

@@ -233,9 +233,6 @@ export default function RFB(target, defaults) {
         Log.Warn("WebSocket on-error event");
     });
 
-    var rmode = this._display.get_render_mode();
-    Log.Info("Using native WebSockets, render mode: " + rmode);
-
     Log.Debug("<< RFB.constructor");
 };
 

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
-| render_mode | str   | RO   | ''      | Canvas rendering mode
 | prefer_js   | str   | RW   |         | Prefer JavaScript over canvas methods
 | cursor_uri  | raw   | RW   |         | Can we render cursor using data URI