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// Copyright (c) 2012 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/base/x/valuators.h"
#include <X11/extensions/XInput2.h>
#include "base/memory/singleton.h"
#include "ui/base/touch/touch_factory.h"
#include "ui/base/x/x11_util.h"
namespace {
#define AXIS_LABEL_ABS_MT_TOUCH_MAJOR "Abs MT Touch Major"
#define AXIS_LABEL_ABS_MT_TOUCH_MINOR "Abs MT Touch Minor"
#define AXIS_LABEL_ABS_MT_ORIENTATION "Abs MT Orientation"
#define AXIS_LABEL_ABS_MT_PRESSURE "Abs MT Pressure"
#define AXIS_LABEL_ABS_MT_SLOT_ID "Abs MT Slot ID"
#define AXIS_LABEL_ABS_MT_TRACKING_ID "Abs MT Tracking ID"
// Given the Valuator, return the correspoding XIValuatorClassInfo using
// the X device information through Atom name matching.
XIValuatorClassInfo* FindValuator(Display* display,
XIDeviceInfo* info,
ui::ValuatorTracker::Valuator val) {
// Lookup table for mapping Valuator to Atom string used in X.
// A full set of Atom strings can be found at xserver-properties.h.
static struct {
ui::ValuatorTracker::Valuator val;
Atom atom;
} kValuatorAtom[] = {
{ ui::ValuatorTracker::VAL_TOUCH_MAJOR,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_TOUCH_MAJOR, false) },
{ ui::ValuatorTracker::VAL_TOUCH_MINOR,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_TOUCH_MINOR, false) },
{ ui::ValuatorTracker::VAL_ORIENTATION,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_ORIENTATION, false) },
{ ui::ValuatorTracker::VAL_PRESSURE,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_PRESSURE, false) },
#if !defined(USE_XI2_MT)
// For Slot ID, See this chromeos revision: http://git.chromium.org/gitweb/?
// p=chromiumos/overlays/chromiumos-overlay.git;
// a=commit;h=9164d0a75e48c4867e4ef4ab51f743ae231c059a
{ ui::ValuatorTracker::VAL_SLOT_ID,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_SLOT_ID, false) },
#endif
{ ui::ValuatorTracker::VAL_TRACKING_ID,
XInternAtom(ui::GetXDisplay(), AXIS_LABEL_ABS_MT_TRACKING_ID, false) },
{ ui::ValuatorTracker::VAL_LAST_ENTRY, None },
};
Atom atom = None;
for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kValuatorAtom); i++) {
if (val == kValuatorAtom[i].val) {
atom = kValuatorAtom[i].atom;
break;
}
}
if (atom == None)
return NULL;
for (int i = 0; i < info->num_classes; i++) {
if (info->classes[i]->type != XIValuatorClass)
continue;
XIValuatorClassInfo* v =
reinterpret_cast<XIValuatorClassInfo*>(info->classes[i]);
if (v->label && atom == v->label)
return v;
}
return NULL;
}
} // namespace
namespace ui {
ValuatorTracker::ValuatorTracker() {
SetupValuator();
}
ValuatorTracker::~ValuatorTracker() {
}
// static
ValuatorTracker* ValuatorTracker::GetInstance() {
return Singleton<ValuatorTracker>::get();
}
bool ValuatorTracker::ExtractValuator(const XEvent& xev,
Valuator val,
float* value) {
XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(xev.xcookie.data);
if (xiev->sourceid >= kMaxDeviceNum || xiev->deviceid >= kMaxDeviceNum)
return false;
int val_index = valuator_lookup_[xiev->sourceid][val];
if (val_index >= 0) {
if (XIMaskIsSet(xiev->valuators.mask, val_index)) {
double* valuators = xiev->valuators.values;
while (val_index--) {
if (XIMaskIsSet(xiev->valuators.mask, val_index))
++valuators;
}
*value = *valuators;
last_seen_valuator_[xiev->deviceid][val] = *value;
return true;
} else {
*value = last_seen_valuator_[xiev->deviceid][val];
}
}
#if defined(USE_XI2_MT)
// With XInput2 MT, Tracking ID is provided in the detail field.
if (val == VAL_TRACKING_ID) {
*value = xiev->detail;
return true;
}
#endif
return false;
}
bool ValuatorTracker::NormalizeValuator(unsigned int deviceid,
Valuator val,
float* value) {
float max_value;
float min_value;
if (GetValuatorRange(deviceid, val, &min_value, &max_value)) {
*value = (*value - min_value) / (max_value - min_value);
DCHECK(*value >= 0.0 && *value <= 1.0);
return true;
}
return false;
}
bool ValuatorTracker::GetValuatorRange(unsigned int deviceid,
Valuator val,
float* min,
float* max) {
if (valuator_lookup_[deviceid][val] >= 0) {
*min = valuator_min_[deviceid][val];
*max = valuator_max_[deviceid][val];
return true;
}
return false;
}
void ValuatorTracker::SetupValuator() {
memset(valuator_lookup_, -1, sizeof(valuator_lookup_));
memset(valuator_min_, 0, sizeof(valuator_min_));
memset(valuator_max_, 0, sizeof(valuator_max_));
memset(last_seen_valuator_, 0, sizeof(last_seen_valuator_));
Display* display = GetXDisplay();
int ndevice;
XIDeviceInfo* info_list = XIQueryDevice(display, XIAllDevices, &ndevice);
TouchFactory* factory = TouchFactory::GetInstance();
for (int i = 0; i < ndevice; i++) {
XIDeviceInfo* info = info_list + i;
if (!factory->IsTouchDevice(info->deviceid))
continue;
for (int j = 0; j < VAL_LAST_ENTRY; j++) {
Valuator val = static_cast<Valuator>(j);
XIValuatorClassInfo* valuator = FindValuator(display, info, val);
if (valuator) {
valuator_lookup_[info->deviceid][j] = valuator->number;
valuator_min_[info->deviceid][j] = valuator->min;
valuator_max_[info->deviceid][j] = valuator->max;
}
}
}
if (info_list)
XIFreeDeviceInfo(info_list);
}
} // namespace ui
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