Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/apps/camera/js/lib/orientation.js

@@ -0,0 +1,81 @@
+define(function(require, exports, module) {
+  'use strict';
+
+  var listener = require('device-orientation');
+  var classes = document.body.classList;
+  var current = 0;
+
+  listener.on('orientation', onOrientationChange);
+  listener.start();
+
+  function onOrientationChange(degrees) {
+    classes.remove('deg' + current);
+    classes.add('deg' + degrees);
+    current = degrees;
+  }
+
+  // Camera normally has its orientation locked to portrait mode.
+  // But we unlock orientation when displaying image and video previews.
+  // When orientation is unlocked, we call listener.stop().
+  // We calls call stop() when recording a video, and then restart
+  // when recording is done. If our app ever changes so that we can call
+  // unlock while the orientation listener is in the stopped state, then
+  // we would need to modify the lock() function so that it did not
+  // restart the listener. That is not needed now, however and is omitted.
+
+  function unlock() {
+    screen.mozUnlockOrientation();
+    listener.stop();
+  }
+
+  function lock() {
+    screen.mozLockOrientation('default');
+    listener.start();
+  }
+
+  function rationalize(sensorAngle, angle) {
+    if (typeof(angle) === 'undefined') {
+      angle = current;
+    }
+
+    // The result of this operation is an angle from 0..270 degrees,
+    // in steps of 90 degrees. Angles are rounded to the nearest
+    // magnitude, so 45 will be rounded to 90, and -45 will be rounded
+    // to -90 (not 0).
+    var r = angle + sensorAngle;
+    if (r >= 0) {
+      r += 45;
+    } else {
+      r -= 45;
+    }
+    r /= 90;
+    if (r >= 0) {
+      r = Math.floor(r);
+    } else {
+      r = Math.ceil(r);
+    }
+    r %= 4;
+    r *= 90;
+    if (r < 0) {
+      r += 360;
+    }
+    return r;
+  }
+
+  /**
+   * Exports
+   */
+
+  module.exports = {
+    on: listener.on,
+    off: listener.off,
+    start: listener.start,
+    stop: listener.stop,
+    unlock: unlock,
+    lock: lock,
+    rationalize: rationalize,
+    get: function() {
+      return current;
+    }
+  };
+});