Fixed ui::TouchEvent rotation angle out-of-bound issue.

ui/events/event.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/extensions/XInput2.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
@@ skipping 517 matching lines @@
       force_(GetTouchForce(native_event)),
       may_cause_scrolling_(false) {
   latency()->AddLatencyNumberWithTimestamp(
       INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
       0,
       0,
       base::TimeTicks::FromInternalValue(time_stamp().ToInternalValue()),
       1);
 
   latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
+  fixRotationAngle();
 
   if (type() == ET_TOUCH_PRESSED)
     IncrementTouchIdRefCount(native_event);
 }
 
 TouchEvent::TouchEvent(EventType type,
                        const gfx::PointF& location,
                        int touch_id,
                        base::TimeDelta time_stamp)
     : LocatedEvent(type, location, location, time_stamp, 0),
@@ skipping 18 matching lines @@
                        float force)
     : LocatedEvent(type, location, location, time_stamp, flags),
       touch_id_(touch_id),
       unique_event_id_(get_next_touch_event_id()),
       radius_x_(radius_x),
       radius_y_(radius_y),
       rotation_angle_(angle),
       force_(force),
       may_cause_scrolling_(false) {
   latency()->AddLatencyNumber(INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
+  fixRotationAngle();
 }
 
 TouchEvent::~TouchEvent() {
   // In ctor TouchEvent(native_event) we call GetTouchId() which in X11
   // platform setups the tracking_id to slot mapping. So in dtor here,
   // if this touch event is a release event, we clear the mapping accordingly.
   if (HasNativeEvent())
     ClearTouchIdIfReleased(native_event());
 }
 
 void TouchEvent::UpdateForRootTransform(
     const gfx::Transform& inverted_root_transform) {
   LocatedEvent::UpdateForRootTransform(inverted_root_transform);
   gfx::DecomposedTransform decomp;
   bool success = gfx::DecomposeTransform(&decomp, inverted_root_transform);
   DCHECK(success);
   if (decomp.scale[0])
     radius_x_ *= decomp.scale[0];
   if (decomp.scale[1])
     radius_y_ *= decomp.scale[1];
 }
 
 void TouchEvent::DisableSynchronousHandling() {
   DispatcherApi dispatcher_api(this);
   dispatcher_api.set_result(
       static_cast<EventResult>(result() | ER_DISABLE_SYNC_HANDLING));
 }
 
+void TouchEvent::fixRotationAngle() {
+  if (rotation_angle_ < 0)
+    rotation_angle_ = fmod(rotation_angle_, 90) + 90;
+  else if (rotation_angle_ >= 90)
+    rotation_angle_ = fmod(rotation_angle_, 90);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // KeyEvent
 
 // static
 KeyEvent* KeyEvent::last_key_event_ = NULL;
 
 // static
 bool KeyEvent::IsRepeated(const KeyEvent& event) {
   // A safe guard in case if there were continous key pressed events that are
   // not auto repeat.
@@ skipping 350 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui