Make jpeg quality configurable.

lib/cli.js

@@ -64,6 +64,10 @@ program
     , 'screen WebSocket URL pattern'
     , String
     , 'ws://${publicIp}:${publicPort}')
+  .option('--screen-jpeg-quality <quality>'
+    , 'screen JPEG quality'
+    , Number
+    , process.env.SCREEN_JPEG_QUALITY || 80)
   .option('--connect-url-pattern <pattern>'
     , 'adb connect URL pattern'
     , String
@@ -113,6 +117,7 @@ program
         , '--adb-host', options.adbHost
         , '--adb-port', options.adbPort
         , '--screen-ws-url-pattern', options.screenWsUrlPattern
+        , '--screen-jpeg-quality', options.screenJpegQuality
         , '--connect-url-pattern', options.connectUrlPattern
         , '--heartbeat-interval', options.heartbeatInterval
         , '--vnc-initial-size', options.vncInitialSize.join('x')
@@ -182,6 +187,10 @@ program
     , 'screen WebSocket URL pattern'
     , String
     , 'ws://${publicIp}:${publicPort}')
+  .option('--screen-jpeg-quality <quality>'
+    , 'screen JPEG quality'
+    , Number
+    , process.env.SCREEN_JPEG_QUALITY || 80)
   .option('--heartbeat-interval <ms>'
     , 'heartbeat interval'
     , Number
@@ -228,6 +237,7 @@ program
     , adbHost: options.adbHost
     , adbPort: options.adbPort
     , screenWsUrlPattern: options.screenWsUrlPattern
+    , screenJpegQuality: options.screenJpegQuality
     , screenPort: options.screenPort
     , connectUrlPattern: options.connectUrlPattern
     , connectPort: options.connectPort