Add support for ViewSonic XG270 monitor

usb/ViewSonic_XG270.js

@@ -0,0 +1,85 @@
+/* global
+shutdownColor:readonly
+LightingMode:readonly
+*/
+export function Name() { return "ViewSonic XG270"; }
+export function VendorId() { return 0x0416; }
+export function ProductId() { return 0x5020; }
+export function Vids() { return [0x0416, 0x0543]; }
+export function Pids() { return [0x5020, 0xA004, 0xA002]; }
+export function Publisher() { return "Gemini & Community"; }
+export function Version() { return "1.0.1"; }
+export function Size() { return [2, 1]; }
+export function DefaultPosition() { return [10, 10]; }
+export function DefaultScale() { return 8.0; }
+export function Type() { return "Hid"; }
+
+export function Validate(endpoint) {
+    return endpoint.interface !== -1;
+}
+
+export function ControllableParameters() {
+    return [
+        {"property":"shutdownColor", "group":"lighting", "label":"Shutdown Color", "min":"0", "max":"360", "type":"color", "default":"#000000"},
+        {"property":"LightingMode", "group":"lighting", "label":"Lighting Mode", "type":"combobox", "values":["Canvas", "Forced Off"], "default":"Canvas"},
+    ];
+}
+
+export function vLedNames() { return [ "Downward LEDs", "Rear Ring LEDs" ]; }
+export function vLedPositions() { return [ [0, 0], [1, 0] ]; }
+
+const VS_MODE_OFF = 0x00;
+const VS_MODE_STATIC = 0x01; 
+
+let downwardColor = [0, 0, 0];
+let rearColor = [0, 0, 0];
+
+export function Initialize() {
+}
+
+export function Render() {
+    sendColors();
+}
+
+export function Shutdown() {
+}
+
+export function LedNames() {
+    return vLedNames();
+}
+
+export function LedPositions() {
+    return vLedPositions();
+}
+
+export function sendColors() {
+    downwardColor = device.color(0, 0);
+    rearColor = device.color(1, 0);
+
+    let mode = LightingMode === "Forced Off" ? VS_MODE_OFF : VS_MODE_STATIC;
+
+    let packet = new Array(65).fill(0x00);
+    packet[0] = 0x02; // Report ID
+    packet[1] = mode;
+    packet[2] = downwardColor[0];
+    packet[3] = downwardColor[1];
+    packet[4] = downwardColor[2];
+    packet[5] = 0x00;
+    packet[6] = 0x0A;
+    packet[7] = 0x00;
+    packet[8] = mode;
+    packet[9] = rearColor[0];
+    packet[10] = rearColor[1];
+    packet[11] = rearColor[2];
+    packet[12] = 0x00;
+    packet[13] = 0x0A;
+    packet[14] = 0x00;
+    packet[15] = 0x01;
+
+    device.send_report(packet, 65);
+}
+
+function hexToRgb(hex) {
+    let result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result ? [parseInt(result[1], 16), parseInt(result[2], 16), parseInt(result[3], 16)] : [0, 0, 0];
+}