ash/touch/touch_transformer_controller.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/touch/touch_transformer_controller.h"
   6
   7 #include "ash/display/display_controller.h"
   8 #include "ash/display/display_manager.h"
   9 #include "ash/host/ash_window_tree_host.h"
  10 #include "ash/root_window_controller.h"
  11 #include "ash/shell.h"
  12 #include "ui/aura/window_tree_host.h"
  13 #include "ui/display/chromeos/display_configurator.h"
  14 #include "ui/display/types/chromeos/display_snapshot.h"
  15 #include "ui/events/device_data_manager.h"
  16 #include "ui/events/x/device_data_manager_x11.h"
  17
  18 namespace ash {
  19
  20 namespace {
  21
  22 DisplayManager* GetDisplayManager() {
  23   return Shell::GetInstance()->display_manager();
  24 }
  25
  26 }  // namespace
  27
  28
  29 // This is to compute the scale ratio for the TouchEvent's radius. The
  30 // configured resolution of the display is not always the same as the touch
  31 // screen's reporting resolution, e.g. the display could be set as
  32 // 1920x1080 while the touchscreen is reporting touch position range at
  33 // 32767x32767. Touch radius is reported in the units the same as touch position
  34 // so we need to scale the touch radius to be compatible with the display's
  35 // resolution. We compute the scale as
  36 // sqrt of (display_area / touchscreen_area)
  37 double TouchTransformerController::GetTouchResolutionScale(
  38     const DisplayInfo& touch_display) const {
  39   if (touch_display.touch_device_id() == 0)
  40     return 1.0;
  41
  42   double min_x, max_x;
  43   double min_y, max_y;
  44   if (!ui::DeviceDataManagerX11::GetInstance()->GetDataRange(
  45           touch_display.touch_device_id(),
  46           ui::DeviceDataManagerX11::DT_TOUCH_POSITION_X,
  47           &min_x, &max_x) ||
  48       !ui::DeviceDataManagerX11::GetInstance()->GetDataRange(
  49           touch_display.touch_device_id(),
  50           ui::DeviceDataManagerX11::DT_TOUCH_POSITION_Y,
  51           &min_y, &max_y)) {
  52     return 1.0;
  53   }
  54
  55   double width = touch_display.bounds_in_native().width();
  56   double height = touch_display.bounds_in_native().height();
  57
  58   if (max_x == 0.0 || max_y == 0.0 || width == 0.0 || height == 0.0)
  59     return 1.0;
  60
  61   // [0, max_x] -> touchscreen width = max_x + 1
  62   // [0, max_y] -> touchscreen height = max_y + 1
  63   max_x += 1.0;
  64   max_y += 1.0;
  65
  66   double ratio = std::sqrt((width * height) / (max_x * max_y));
  67
  68   VLOG(2) << "Screen width/height: " << width << "/" << height
  69           << ", Touchscreen width/height: " << max_x << "/" << max_y
  70           << ", Touch radius scale ratio: " << ratio;
  71   return ratio;
  72 }
  73
  74 // This function computes the extended mode TouchTransformer for
  75 // |touch_display|. The TouchTransformer maps the touch event position
  76 // from framebuffer size to the display size.
  77 gfx::Transform
  78 TouchTransformerController::GetExtendedModeTouchTransformer(
  79     const DisplayInfo& touch_display, const gfx::Size& fb_size) const {
  80   gfx::Transform ctm;
  81   if (touch_display.touch_device_id() == 0 ||
  82       fb_size.width() == 0.0 ||
  83       fb_size.height() == 0.0)
  84     return ctm;
  85   float width = touch_display.bounds_in_native().width();
  86   float height = touch_display.bounds_in_native().height();
  87   ctm.Scale(width / fb_size.width(), height / fb_size.height());
  88   return ctm;
  89 }
  90
  91 bool TouchTransformerController::ShouldComputeMirrorModeTouchTransformer(
  92     const DisplayInfo& touch_display) const {
  93   if (force_compute_mirror_mode_touch_transformer_)
  94     return true;
  95
  96   if (touch_display.touch_device_id() == 0)
  97     return false;
  98
  99   const ui::DisplayConfigurator::DisplayState* state = NULL;
 100   const std::vector<ui::DisplayConfigurator::DisplayState>& cached_displays =
 101       Shell::GetInstance()->display_configurator()->cached_displays();
 102   for (size_t i = 0; i < cached_displays.size(); i++) {
 103     if (cached_displays[i].touch_device_id == touch_display.touch_device_id()) {
 104       state = &cached_displays[i];
 105       break;
 106     }
 107   }
 108
 109   if (!state || state->mirror_mode == state->display->native_mode() ||
 110       !state->display->is_aspect_preserving_scaling()) {
 111     return false;
 112   }
 113   return true;
 114 }
 115
 116 // This function computes the mirror mode TouchTransformer for |touch_display|.
 117 // When internal monitor is applied a resolution that does not have
 118 // the same aspect ratio as its native resolution, there would be
 119 // blank regions in the letterboxing/pillarboxing mode.
 120 // The TouchTransformer will make sure the touch events on the blank region
 121 // have negative coordinates and touch events within the chrome region
 122 // have the correct positive coordinates.
 123 gfx::Transform TouchTransformerController::GetMirrorModeTouchTransformer(
 124     const DisplayInfo& touch_display) const {
 125   gfx::Transform ctm;
 126   if (!ShouldComputeMirrorModeTouchTransformer(touch_display))
 127     return ctm;
 128
 129   float mirror_width = touch_display.bounds_in_native().width();
 130   float mirror_height = touch_display.bounds_in_native().height();
 131   float native_width = 0;
 132   float native_height = 0;
 133
 134   std::vector<DisplayMode> modes = touch_display.display_modes();
 135   for (size_t i = 0; i < modes.size(); i++) {
 136        if (modes[i].native) {
 137          native_width = modes[i].size.width();
 138          native_height = modes[i].size.height();
 139          break;
 140        }
 141   }
 142
 143   if (native_height == 0.0 || mirror_height == 0.0 ||
 144       native_width == 0.0 || mirror_width == 0.0)
 145     return ctm;
 146
 147   float native_ar = static_cast<float>(native_width) /
 148       static_cast<float>(native_height);
 149   float mirror_ar = static_cast<float>(mirror_width) /
 150       static_cast<float>(mirror_height);
 151
 152   if (mirror_ar > native_ar) {  // Letterboxing
 153     // Translate before scale.
 154     ctm.Translate(0.0, (1.0 - mirror_ar / native_ar) * 0.5 * mirror_height);
 155     ctm.Scale(1.0, mirror_ar / native_ar);
 156     return ctm;
 157   }
 158
 159   if (native_ar > mirror_ar) {  // Pillarboxing
 160     // Translate before scale.
 161     ctm.Translate((1.0 - native_ar / mirror_ar) * 0.5 * mirror_width, 0.0);
 162     ctm.Scale(native_ar / mirror_ar, 1.0);
 163     return ctm;
 164   }
 165
 166   return ctm;  // Same aspect ratio - return identity
 167 }
 168
 169 TouchTransformerController::TouchTransformerController() :
 170     force_compute_mirror_mode_touch_transformer_ (false) {
 171   Shell::GetInstance()->display_controller()->AddObserver(this);
 172 }
 173
 174 TouchTransformerController::~TouchTransformerController() {
 175   Shell::GetInstance()->display_controller()->RemoveObserver(this);
 176 }
 177
 178 void TouchTransformerController::UpdateTouchTransformer() const {
 179   ui::DeviceDataManager* device_manager = ui::DeviceDataManager::GetInstance();
 180   device_manager->ClearTouchTransformerRecord();
 181
 182   // Display IDs and DisplayInfo for mirror or extended mode.
 183   int64 display1_id = gfx::Display::kInvalidDisplayID;
 184   int64 display2_id = gfx::Display::kInvalidDisplayID;
 185   DisplayInfo display1;
 186   DisplayInfo display2;
 187   // Display ID and DisplayInfo for single display mode.
 188   int64 single_display_id = gfx::Display::kInvalidDisplayID;
 189   DisplayInfo single_display;
 190
 191   DisplayController* display_controller =
 192       Shell::GetInstance()->display_controller();
 193   ui::MultipleDisplayState display_state =
 194       Shell::GetInstance()->display_configurator()->display_state();
 195   if (display_state == ui::MULTIPLE_DISPLAY_STATE_INVALID ||
 196       display_state == ui::MULTIPLE_DISPLAY_STATE_HEADLESS) {
 197     return;
 198   } else if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR ||
 199              display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED) {
 200     // TODO(miletus) : Handle DUAL_EXTENDED with software mirroring.
 201     DisplayIdPair id_pair = GetDisplayManager()->GetCurrentDisplayIdPair();
 202     display1_id = id_pair.first;
 203     display2_id = id_pair.second;
 204     DCHECK(display1_id != gfx::Display::kInvalidDisplayID &&
 205            display2_id != gfx::Display::kInvalidDisplayID);
 206     display1 = GetDisplayManager()->GetDisplayInfo(display1_id);
 207     display2 = GetDisplayManager()->GetDisplayInfo(display2_id);
 208     device_manager->UpdateTouchRadiusScale(display1.touch_device_id(),
 209                                            GetTouchResolutionScale(display1));
 210     device_manager->UpdateTouchRadiusScale(display2.touch_device_id(),
 211                                            GetTouchResolutionScale(display2));
 212   } else {
 213     single_display_id = GetDisplayManager()->first_display_id();
 214     DCHECK(single_display_id != gfx::Display::kInvalidDisplayID);
 215     single_display = GetDisplayManager()->GetDisplayInfo(single_display_id);
 216     device_manager->UpdateTouchRadiusScale(
 217         single_display.touch_device_id(),
 218         GetTouchResolutionScale(single_display));
 219   }
 220
 221   if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) {
 222     // In mirror mode, both displays share the same root window so
 223     // both display ids are associated with the root window.
 224     aura::Window* root = display_controller->GetPrimaryRootWindow();
 225     RootWindowController::ForWindow(root)->ash_host()->UpdateDisplayID(
 226         display1_id, display2_id);
 227     device_manager->UpdateTouchInfoForDisplay(
 228         display1_id,
 229         display1.touch_device_id(),
 230         GetMirrorModeTouchTransformer(display1));
 231     device_manager->UpdateTouchInfoForDisplay(
 232         display2_id,
 233         display2.touch_device_id(),
 234         GetMirrorModeTouchTransformer(display2));
 235     return;
 236   }
 237
 238   if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED) {
 239     // TODO(miletus) : Handle the case the state is DUAL_EXTENDED but it
 240     // is actually doing software mirroring.
 241     if (GetDisplayManager()->software_mirroring_enabled())
 242       return;
 243     // In extended mode, each display is associated with one root window.
 244     aura::Window* root1 =
 245         display_controller->GetRootWindowForDisplayId(display1_id);
 246     aura::Window* root2 =
 247         display_controller->GetRootWindowForDisplayId(display2_id);
 248     RootWindowController::ForWindow(root1)->ash_host()->UpdateDisplayID(
 249         display1_id, gfx::Display::kInvalidDisplayID);
 250     RootWindowController::ForWindow(root2)->ash_host()->UpdateDisplayID(
 251         display2_id, gfx::Display::kInvalidDisplayID);
 252     gfx::Size fb_size =
 253         Shell::GetInstance()->display_configurator()->framebuffer_size();
 254     device_manager->UpdateTouchInfoForDisplay(
 255         display1_id,
 256         display1.touch_device_id(),
 257         GetExtendedModeTouchTransformer(display1, fb_size));
 258     device_manager->UpdateTouchInfoForDisplay(
 259         display2_id,
 260         display2.touch_device_id(),
 261         GetExtendedModeTouchTransformer(display2, fb_size));
 262     return;
 263   }
 264
 265   // Single display mode. The root window has one associated display id.
 266   aura::Window* root =
 267       display_controller->GetRootWindowForDisplayId(single_display.id());
 268   RootWindowController::ForWindow(root)->ash_host()->UpdateDisplayID(
 269       single_display.id(), gfx::Display::kInvalidDisplayID);
 270   device_manager->UpdateTouchInfoForDisplay(single_display_id,
 271                                             single_display.touch_device_id(),
 272                                             gfx::Transform());
 273 }
 274
 275 void TouchTransformerController::OnDisplaysInitialized() {
 276   UpdateTouchTransformer();
 277 }
 278
 279 void TouchTransformerController::OnDisplayConfigurationChanged() {
 280   UpdateTouchTransformer();
 281 }
 282
 283 }  // namespace ash