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// 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/touch/touchscreen_util.h"
#include <set>
#include "base/logging.h"
#include "ui/events/input_device.h"
namespace ash {
void AssociateTouchscreens(std::vector<DisplayInfo>* displays,
const std::vector<ui::TouchscreenDevice>& devices) {
std::set<int> no_match_touchscreen;
int internal_touchscreen = -1;
for (size_t i = 0; i < devices.size(); ++i) {
if (devices[i].type == ui::InputDeviceType::INPUT_DEVICE_INTERNAL) {
internal_touchscreen = i;
break;
}
}
DisplayInfo* internal_state = NULL;
for (size_t i = 0; i < displays->size(); ++i) {
DisplayInfo* state = &(*displays)[i];
if (state->id() == gfx::Display::InternalDisplayId() &&
!state->GetNativeModeSize().IsEmpty() &&
state->touch_support() == gfx::Display::TOUCH_SUPPORT_UNKNOWN) {
internal_state = state;
break;
}
}
if (internal_state && internal_touchscreen >= 0) {
internal_state->set_touch_device_id(devices[internal_touchscreen].id);
internal_state->set_touch_support(gfx::Display::TOUCH_SUPPORT_AVAILABLE);
VLOG(2) << "Found internal touchscreen for internal display "
<< internal_state->id() << " touch_device_id "
<< internal_state->touch_device_id() << " size "
<< devices[internal_touchscreen].size.ToString();
}
for (size_t i = 0; i < devices.size(); ++i) {
if (internal_state && internal_state->touch_device_id() == devices[i].id)
continue;
bool found_mapping = false;
for (size_t j = 0; j < displays->size(); ++j) {
DisplayInfo* state = &(*displays)[j];
const gfx::Size native_size = state->GetNativeModeSize();
if (state->touch_support() == gfx::Display::TOUCH_SUPPORT_AVAILABLE ||
native_size.IsEmpty())
continue;
// Allow 1 pixel difference between screen and touchscreen
// resolutions. Because in some cases for monitor resolution
// 1024x768 touchscreen's resolution would be 1024x768, but for
// some 1023x767. It really depends on touchscreen's firmware
// configuration.
if (std::abs(native_size.width() - devices[i].size.width()) <= 1 &&
std::abs(native_size.height() - devices[i].size.height()) <= 1) {
state->set_touch_device_id(devices[i].id);
state->set_touch_support(gfx::Display::TOUCH_SUPPORT_AVAILABLE);
VLOG(2) << "Found touchscreen for display " << state->id()
<< " touch_device_id " << state->touch_device_id() << " size "
<< devices[i].size.ToString();
found_mapping = true;
break;
}
}
if (!found_mapping) {
no_match_touchscreen.insert(devices[i].id);
VLOG(2) << "No matching display for touch_device_id " << devices[i].id
<< " size " << devices[i].size.ToString();
}
}
// Sometimes we can't find a matching screen for the touchscreen, e.g.
// due to the touchscreen's reporting range having no correlation with the
// screen's resolution. In this case, we arbitrarily assign unmatched
// touchscreens to unmatched screens.
for (std::set<int>::iterator it = no_match_touchscreen.begin();
it != no_match_touchscreen.end();
++it) {
for (size_t i = 0; i < displays->size(); ++i) {
DisplayInfo* state = &(*displays)[i];
if (state->id() != gfx::Display::InternalDisplayId() &&
!state->GetNativeModeSize().IsEmpty() &&
state->touch_support() == gfx::Display::TOUCH_SUPPORT_UNKNOWN) {
state->set_touch_device_id(*it);
state->set_touch_support(gfx::Display::TOUCH_SUPPORT_AVAILABLE);
VLOG(2) << "Arbitrarily matching touchscreen "
<< state->touch_device_id() << " to display " << state->id();
break;
}
}
}
}
} // namespace ash
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