Move touch CTM from X into Chrome

ash/host/ash_window_tree_host_x11.cc

 // Copyright 2014 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 "ash/host/ash_window_tree_host_x11.h"
 
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 
 #include <string>
 #include <vector>
 
 #include "ash/host/root_window_transformer.h"
 #include "base/basictypes.h"
-#include "base/command_line.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/events/event.h"
-#include "ui/events/event_switches.h"
 #include "ui/events/event_utils.h"
-#include "ui/events/platform/platform_event_observer.h"
-#include "ui/events/platform/x11/x11_event_source.h"
 #include "ui/events/x/device_data_manager.h"
 #include "ui/events/x/device_list_cache_x.h"
 #include "ui/events/x/touch_factory_x11.h"
-
 #include "ui/gfx/rect.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
 
-// Accomplishes 2 tasks concerning touch event calibration:
-// 1. Being a message-pump observer,
-//    routes all the touch events to the X root window,
-//    where they can be calibrated later.
-// 2. Has the Calibrate method that does the actual bezel calibration,
-//    when invoked from X root window's event dispatcher.
-class AshWindowTreeHostX11::TouchEventCalibrate
-    : public ui::PlatformEventObserver {
- public:
-  TouchEventCalibrate() : left_(0), right_(0), top_(0), bottom_(0) {
-    if (ui::PlatformEventSource::GetInstance())
-      ui::PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
-#if defined(USE_XI2_MT)
-    std::vector<std::string> parts;
-    if (Tokenize(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-                     switches::kTouchCalibration),
-                 ",",
-                 &parts) >= 4) {
-      if (!base::StringToInt(parts[0], &left_))
-        DLOG(ERROR) << "Incorrect left border calibration value passed.";
-      if (!base::StringToInt(parts[1], &right_))
-        DLOG(ERROR) << "Incorrect right border calibration value passed.";
-      if (!base::StringToInt(parts[2], &top_))
-        DLOG(ERROR) << "Incorrect top border calibration value passed.";
-      if (!base::StringToInt(parts[3], &bottom_))
-        DLOG(ERROR) << "Incorrect bottom border calibration value passed.";
-    }
-#endif  // defined(USE_XI2_MT)
-  }
-
-  virtual ~TouchEventCalibrate() {
-    if (ui::PlatformEventSource::GetInstance())
-      ui::PlatformEventSource::GetInstance()->RemovePlatformEventObserver(this);
-  }
-
-  // Modify the location of the |event|,
-  // expanding it from |bounds| to (|bounds| + bezels).
-  // Required when touchscreen is bigger than screen (i.e. has bezels),
-  // because we receive events in touchscreen coordinates,
-  // which need to be expanded when converting to screen coordinates,
-  // so that location on bezels will be outside of screen area.
-  void Calibrate(ui::TouchEvent* event, const gfx::Rect& bounds) {
-#if defined(USE_XI2_MT)
-    int x = event->x();
-    int y = event->y();
-
-    if (!left_ && !right_ && !top_ && !bottom_)
-      return;
-
-    const int resolution_x = bounds.width();
-    const int resolution_y = bounds.height();
-    // The "grace area" (10% in this case) is to make it easier for the user to
-    // navigate to the corner.
-    const double kGraceAreaFraction = 0.1;
-    if (left_ || right_) {
-      // Offset the x position to the real
-      x -= left_;
-      // Check if we are in the grace area of the left side.
-      // Note: We might not want to do this when the gesture is locked?
-      if (x < 0 && x > -left_ * kGraceAreaFraction)
-        x = 0;
-      // Check if we are in the grace area of the right side.
-      // Note: We might not want to do this when the gesture is locked?
-      if (x > resolution_x - left_ &&
-          x < resolution_x - left_ + right_ * kGraceAreaFraction)
-        x = resolution_x - left_;
-      // Scale the screen area back to the full resolution of the screen.
-      x = (x * resolution_x) / (resolution_x - (right_ + left_));
-    }
-    if (top_ || bottom_) {
-      // When there is a top bezel we add our border,
-      y -= top_;
-
-      // Check if we are in the grace area of the top side.
-      // Note: We might not want to do this when the gesture is locked?
-      if (y < 0 && y > -top_ * kGraceAreaFraction)
-        y = 0;
-
-      // Check if we are in the grace area of the bottom side.
-      // Note: We might not want to do this when the gesture is locked?
-      if (y > resolution_y - top_ &&
-          y < resolution_y - top_ + bottom_ * kGraceAreaFraction)
-        y = resolution_y - top_;
-      // Scale the screen area back to the full resolution of the screen.
-      y = (y * resolution_y) / (resolution_y - (bottom_ + top_));
-    }
-
-    // Set the modified coordinate back to the event.
-    if (event->root_location() == event->location()) {
-      // Usually those will be equal,
-      // if not, I am not sure what the correct value should be.
-      event->set_root_location(gfx::Point(x, y));
-    }
-    event->set_location(gfx::Point(x, y));
-#endif  // defined(USE_XI2_MT)
-  }
-
- private:
-  // ui::PlatformEventObserver:
-  virtual void WillProcessEvent(const ui::PlatformEvent& event) OVERRIDE {
-#if defined(USE_XI2_MT)
-    if (event->type == GenericEvent &&
-        (event->xgeneric.evtype == XI_TouchBegin ||
-         event->xgeneric.evtype == XI_TouchUpdate ||
-         event->xgeneric.evtype == XI_TouchEnd)) {
-      XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(event->xcookie.data);
-      xievent->event = xievent->root;
-      xievent->event_x = xievent->root_x;
-      xievent->event_y = xievent->root_y;
-    }
-#endif  // defined(USE_XI2_MT)
-  }
-
-  virtual void DidProcessEvent(const ui::PlatformEvent& event) OVERRIDE {}
-
-  // The difference in screen's native resolution pixels between
-  // the border of the touchscreen and the border of the screen,
-  // aka bezel sizes.
-  int left_;
-  int right_;
-  int top_;
-  int bottom_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchEventCalibrate);
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// AshWindowTreeHostX11
-
 AshWindowTreeHostX11::AshWindowTreeHostX11(const gfx::Rect& initial_bounds)
     : WindowTreeHostX11(initial_bounds),
-      is_internal_display_(false),
-      touch_calibrate_(new TouchEventCalibrate),
       transformer_helper_(this) {
   aura::Env::GetInstance()->AddObserver(this);
 }
 
 AshWindowTreeHostX11::~AshWindowTreeHostX11() {
   aura::Env::GetInstance()->RemoveObserver(this);
   UnConfineCursor();
 }
 
 void AshWindowTreeHostX11::ToggleFullScreen() { NOTIMPLEMENTED(); }
@@ skipping 58 matching lines @@
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[2]);
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[3]);
     pointer_barriers_.reset();
   }
 #endif
 }
 
 void AshWindowTreeHostX11::SetRootWindowTransformer(
     scoped_ptr<RootWindowTransformer> transformer) {
   transformer_helper_.SetRootWindowTransformer(transformer.Pass());
-  UpdateIsInternalDisplay();
   if (pointer_barriers_) {
     UnConfineCursor();
     ConfineCursorToRootWindow();
   }
 }
 
 aura::WindowTreeHost* AshWindowTreeHostX11::AsWindowTreeHost() { return this; }
 
 void AshWindowTreeHostX11::SetBounds(const gfx::Rect& bounds) {
   WindowTreeHostX11::SetBounds(bounds);
-  UpdateIsInternalDisplay();
   if (pointer_barriers_) {
     UnConfineCursor();
     ConfineCursorToRootWindow();
   }
 }
 
 gfx::Transform AshWindowTreeHostX11::GetRootTransform() const {
   return transformer_helper_.GetTransform();
 }
 
 void AshWindowTreeHostX11::SetRootTransform(const gfx::Transform& transform) {
   transformer_helper_.SetTransform(transform);
 }
 
 gfx::Transform AshWindowTreeHostX11::GetInverseRootTransform() const {
   return transformer_helper_.GetInverseTransform();
 }
 
 void AshWindowTreeHostX11::UpdateRootWindowSize(const gfx::Size& host_size) {
   transformer_helper_.UpdateWindowSize(host_size);
 }
 
 void AshWindowTreeHostX11::OnCursorVisibilityChangedNative(bool show) {
   SetCrOSTapPaused(!show);
 }
 
 void AshWindowTreeHostX11::OnWindowInitialized(aura::Window* window) {}
 
 void AshWindowTreeHostX11::OnHostInitialized(aura::WindowTreeHost* host) {
-  // UpdateIsInternalDisplay relies on RootWindowSettings' display_id being set
-  // available by the time WED::Init is called. (set in
-  // DisplayManager::CreateRootWindowForDisplay)
-  // Ready when NotifyHostInitialized is called from WED::Init.
   if (host != AsWindowTreeHost())
     return;
-  UpdateIsInternalDisplay();
 
   // We have to enable Tap-to-click by default because the cursor is set to
   // visible in Shell::InitRootWindowController.
   SetCrOSTapPaused(false);
 }
 
 void AshWindowTreeHostX11::OnConfigureNotify() {
-  UpdateIsInternalDisplay();
-
   // Always update barrier and mouse location because |bounds_| might
   // have already been updated in |SetBounds|.
   if (pointer_barriers_) {
     UnConfineCursor();
     ConfineCursorToRootWindow();
   }
 }
 
+bool AshWindowTreeHostX11::CanDispatchEvent(const ui::PlatformEvent& event) {
+  if(!WindowTreeHostX11::CanDispatchEvent(event))
+    return false;
+  XEvent* xev = event;
+  XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+  ui::EventType type = ui::EventTypeFromNative(xev);
+  // For touch event, check if the root window is residing on the according
+  // touch display.
+  switch (type) {
+    case ui::ET_TOUCH_MOVED:
+    case ui::ET_TOUCH_PRESSED:
+    case ui::ET_TOUCH_CANCELLED:
+    case ui::ET_TOUCH_RELEASED: {
+#if defined(OS_CHROMEOS)
+      int64 touch_display_id =
+          ui::DeviceDataManager::GetInstance()->GetDisplayForTouchDevice(
+              xiev->deviceid);
+      // If we don't have record of display id for this touch device, check
+      // that if the event is within the bound of the root window. Note
+      // that in multi-monitor case, the event position is in framebuffer
+      // space so the bounds check will not work so well.
+      if (touch_display_id == gfx::Display::kInvalidDisplayID) {
+        if (base::SysInfo::IsRunningOnChromeOS() &&
+            !bounds().Contains(ui::EventLocationFromNative(xev)))
+          return false;
+      } else if (touch_display_id != display_ids().first &&
+                 touch_display_id != display_ids().second) {
+        return false;
+      }
+#endif  // defined(OS_CHROMEOS)
+      return true;
+    }
+    default:
+      return true;
+  }
+}
+
 void AshWindowTreeHostX11::TranslateAndDispatchLocatedEvent(
     ui::LocatedEvent* event) {
   switch (event->type()) {
     case ui::ET_TOUCH_MOVED:
     case ui::ET_TOUCH_PRESSED:
     case ui::ET_TOUCH_CANCELLED:
-    case ui::ET_TOUCH_RELEASED: {
-      ui::TouchEvent* touchev = static_cast<ui::TouchEvent*>(event);
-      if (base::SysInfo::IsRunningOnChromeOS()) {
-        // X maps the touch-surface to the size of the X root-window.
-        // In multi-monitor setup, Coordinate Transformation Matrix
-        // repositions the touch-surface onto part of X root-window
-        // containing aura root-window corresponding to the touchscreen.
-        // However, if aura root-window has non-zero origin,
-        // we need to relocate the event into aura root-window coordinates.
-        touchev->Relocate(bounds().origin());
-#if defined(USE_XI2_MT)
-        if (is_internal_display_)
-          touch_calibrate_->Calibrate(touchev, bounds());
-#endif  // defined(USE_XI2_MT)
-      }
+    case ui::ET_TOUCH_RELEASED:
       break;
-    }
     default: {
       aura::Window* root_window = window();
       aura::client::ScreenPositionClient* screen_position_client =
           aura::client::GetScreenPositionClient(root_window);
       gfx::Rect local(bounds().size());
 
       if (screen_position_client && !local.Contains(event->location())) {
         gfx::Point location(event->location());
         // In order to get the correct point in screen coordinates
         // during passive grab, we first need to find on which host window
         // the mouse is on, and find out the screen coordinates on that
         // host window, then convert it back to this host window's coordinate.
         screen_position_client->ConvertHostPointToScreen(root_window,
                                                          &location);
         screen_position_client->ConvertPointFromScreen(root_window, &location);
         ConvertPointToHost(&location);
         event->set_location(location);
         event->set_root_location(location);
       }
       break;
     }
   }
   SendEventToProcessor(event);
 }
 
-void AshWindowTreeHostX11::UpdateIsInternalDisplay() {
-  aura::Window* root_window = window();
-  gfx::Screen* screen = gfx::Screen::GetScreenFor(root_window);
-  gfx::Display display = screen->GetDisplayNearestWindow(root_window);
-  DCHECK(display.is_valid());
-  is_internal_display_ = display.IsInternal();
-}
-
 void AshWindowTreeHostX11::SetCrOSTapPaused(bool state) {
   if (!ui::IsXInput2Available())
     return;
   // Temporarily pause tap-to-click when the cursor is hidden.
   Atom prop = atom_cache()->GetAtom("Tap Paused");
   unsigned char value = state;
   XIDeviceList dev_list =
       ui::DeviceListCacheX::GetInstance()->GetXI2DeviceList(xdisplay());
 
   // Only slave pointer devices could possibly have tap-paused property.
@@ skipping 28 matching lines @@
                        1);
     }
   }
 }
 
 AshWindowTreeHost* AshWindowTreeHost::Create(const gfx::Rect& initial_bounds) {
   return new AshWindowTreeHostX11(initial_bounds);
 }
 
 }  // namespace ash