[Ozone-Egltest] Scale touch events from device size to window size

ui/ozone/platform/egltest/ozone_platform_egltest.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 "ui/ozone/platform/egltest/ozone_platform_egltest.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "library_loaders/libeglplatform_shim.h"
 #include "third_party/khronos/EGL/egl.h"
+#include "ui/events/devices/device_data_manager.h"
+#include "ui/events/event.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
 #include "ui/events/ozone/events_ozone.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/vsync_provider.h"
 #include "ui/ozone/common/native_display_delegate_ozone.h"
 #include "ui/ozone/public/cursor_factory_ozone.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/ozone_platform.h"
@@ skipping 14 matching lines @@
 
 // Get the library soname to load.
 std::string GetShimLibraryName() {
   std::string library;
   scoped_ptr<base::Environment> env(base::Environment::Create());
   if (env->GetVar(kEglplatformShim, &library))
     return library;
   return kEglplatformShimDefault;
 }
 
+// Touch events are reported in device coordinates. This scales the event to the
+// window's coordinate space.
+void ScaleTouchEvent(TouchEvent* event, const gfx::SizeF& size) {
+  for (const auto& device :
+       DeviceDataManager::GetInstance()->touchscreen_devices()) {
+    if (device.id == static_cast<unsigned int>(event->source_device_id())) {
+      gfx::SizeF touchscreen_size = device.size;
+      gfx::PointF location = event->location_f();
+
+      location.Scale(size.width() / touchscreen_size.width(),
+                     size.height() / touchscreen_size.height());
+      double ratio = std::sqrt(size.GetArea() / touchscreen_size.GetArea());
+
+      event->set_location(location);
+      event->set_radius_x(event->radius_x() * ratio);
+      event->set_radius_y(event->radius_y() * ratio);
+      return;
+    }
+  }
+}
+
 class EgltestWindow : public PlatformWindow, public PlatformEventDispatcher {
  public:
   EgltestWindow(PlatformWindowDelegate* delegate,
                 LibeglplatformShimLoader* eglplatform_shim,
                 EventFactoryEvdev* event_factory,
                 const gfx::Rect& bounds);
   ~EgltestWindow() override;
 
   // PlatformWindow:
   gfx::Rect GetBounds() override;
@@ skipping 85 matching lines @@
 
 void EgltestWindow::MoveCursorTo(const gfx::Point& location) {
   event_factory_->WarpCursorTo(window_id_, location);
 }
 
 bool EgltestWindow::CanDispatchEvent(const ui::PlatformEvent& ne) {
   return true;
 }
 
 uint32_t EgltestWindow::DispatchEvent(const ui::PlatformEvent& native_event) {
+  DCHECK(native_event);
+  Event* event = static_cast<Event*>(native_event);
+  if (event->IsTouchEvent())
+    ScaleTouchEvent(static_cast<TouchEvent*>(event), bounds_.size());
+
   DispatchEventFromNativeUiEvent(
       native_event, base::Bind(&PlatformWindowDelegate::DispatchEvent,
                                base::Unretained(delegate_)));
 
   return ui::POST_DISPATCH_STOP_PROPAGATION;
 }
 
 // EGL surface wrapper for libeglplatform_shim.
 //
 // This just manages the native window lifetime using
@@ skipping 211 matching lines @@
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformEgltest() {
   OzonePlatformEgltest* platform = new OzonePlatformEgltest;
   platform->Initialize();
   return platform;
 }
 
 }  // namespace ui