src/ui/display/chromeos/touchscreen_delegate_impl.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 "ui/display/chromeos/touchscreen_delegate_impl.h"
   6
   7 #include <cmath>
   8 #include <set>
   9
  10 #include "ui/display/types/chromeos/display_mode.h"
  11 #include "ui/display/types/chromeos/display_snapshot.h"
  12 #include "ui/display/types/chromeos/touchscreen_device_manager.h"
  13
  14 namespace ui {
  15
  16 TouchscreenDelegateImpl::TouchscreenDelegateImpl(
  17     scoped_ptr<TouchscreenDeviceManager> touch_device_manager)
  18     : touch_device_manager_(touch_device_manager.Pass()) {}
  19
  20 TouchscreenDelegateImpl::~TouchscreenDelegateImpl() {}
  21
  22 void TouchscreenDelegateImpl::AssociateTouchscreens(
  23     std::vector<DisplayConfigurator::DisplayState>* displays) {
  24   std::set<int> no_match_touchscreen;
  25   std::vector<TouchscreenDevice> devices = touch_device_manager_->GetDevices();
  26   for (size_t i = 0; i < devices.size(); ++i) {
  27     bool found_mapping = false;
  28     for (size_t j = 0; j < displays->size(); ++j) {
  29       DisplayConfigurator::DisplayState* state = &(*displays)[j];
  30       const DisplayMode* mode = state->display->native_mode();
  31       if (state->touch_device_id != 0 || !mode)
  32         continue;
  33
  34       // Allow 1 pixel difference between screen and touchscreen
  35       // resolutions. Because in some cases for monitor resolution
  36       // 1024x768 touchscreen's resolution would be 1024x768, but for
  37       // some 1023x767. It really depends on touchscreen's firmware
  38       // configuration.
  39       if (std::abs(mode->size().width() - devices[i].size.width()) <= 1 &&
  40           std::abs(mode->size().height() - devices[i].size.height()) <= 1) {
  41         state->touch_device_id = devices[i].id;
  42
  43         VLOG(2) << "Found touchscreen for display "
  44                 << state->display->display_id() << " touch_device_id "
  45                 << state->touch_device_id << " size "
  46                 << devices[i].size.ToString();
  47         found_mapping = true;
  48         break;
  49       }
  50     }
  51
  52     if (!found_mapping) {
  53       no_match_touchscreen.insert(devices[i].id);
  54       VLOG(2) << "No matching display for touch_device_id "
  55               << devices[i].id << " size " << devices[i].size.ToString();
  56     }
  57   }
  58
  59   // Sometimes we can't find a matching screen for the touchscreen, e.g.
  60   // due to the touchscreen's reporting range having no correlation with the
  61   // screen's resolution. In this case, we arbitrarily assign unmatched
  62   // touchscreens to unmatched screens.
  63   for (std::set<int>::iterator it = no_match_touchscreen.begin();
  64        it != no_match_touchscreen.end();
  65        ++it) {
  66     for (size_t i = 0; i < displays->size(); ++i) {
  67       DisplayConfigurator::DisplayState* state = &(*displays)[i];
  68       if (state->display->type() != DISPLAY_CONNECTION_TYPE_INTERNAL &&
  69           state->display->native_mode() != NULL &&
  70           state->touch_device_id == 0) {
  71         state->touch_device_id = *it;
  72         VLOG(2) << "Arbitrarily matching touchscreen "
  73                 << state->touch_device_id << " to display "
  74                 << state->display->display_id();
  75         break;
  76       }
  77     }
  78   }
  79 }
  80
  81 }  // namespace ui