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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 "ui/display/chromeos/x11/touchscreen_delegate_x11.h"
#include <X11/extensions/XInput.h>
#include <X11/extensions/XInput2.h>
#include <cmath>
#include <set>
#include "ui/display/types/chromeos/display_mode.h"
#include "ui/display/types/chromeos/display_snapshot.h"
#include "ui/gfx/x/x11_types.h"
namespace ui {
TouchscreenDelegateX11::TouchscreenDelegateX11()
: display_(gfx::GetXDisplay()) {}
TouchscreenDelegateX11::~TouchscreenDelegateX11() {}
void TouchscreenDelegateX11::AssociateTouchscreens(
DisplayConfigurator::DisplayStateList* outputs) {
int ndevices = 0;
Atom valuator_x = XInternAtom(display_, "Abs MT Position X", False);
Atom valuator_y = XInternAtom(display_, "Abs MT Position Y", False);
if (valuator_x == None || valuator_y == None)
return;
std::set<int> no_match_touchscreen;
XIDeviceInfo* info = XIQueryDevice(display_, XIAllDevices, &ndevices);
for (int i = 0; i < ndevices; i++) {
if (!info[i].enabled || info[i].use != XIFloatingSlave)
continue; // Assume all touchscreens are floating slaves
double width = -1.0;
double height = -1.0;
bool is_direct_touch = false;
for (int j = 0; j < info[i].num_classes; j++) {
XIAnyClassInfo* class_info = info[i].classes[j];
if (class_info->type == XIValuatorClass) {
XIValuatorClassInfo* valuator_info =
reinterpret_cast<XIValuatorClassInfo*>(class_info);
if (valuator_x == valuator_info->label) {
// Ignore X axis valuator with unexpected properties
if (valuator_info->number == 0 && valuator_info->mode == Absolute &&
valuator_info->min == 0.0) {
width = valuator_info->max;
}
} else if (valuator_y == valuator_info->label) {
// Ignore Y axis valuator with unexpected properties
if (valuator_info->number == 1 && valuator_info->mode == Absolute &&
valuator_info->min == 0.0) {
height = valuator_info->max;
}
}
}
#if defined(USE_XI2_MT)
if (class_info->type == XITouchClass) {
XITouchClassInfo* touch_info =
reinterpret_cast<XITouchClassInfo*>(class_info);
is_direct_touch = touch_info->mode == XIDirectTouch;
}
#endif
}
// Touchscreens should have absolute X and Y axes,
// and be direct touch devices.
if (width > 0.0 && height > 0.0 && is_direct_touch) {
size_t k = 0;
for (; k < outputs->size(); k++) {
DisplayConfigurator::DisplayState* output = &(*outputs)[k];
if (output->touch_device_id != None)
continue;
const DisplayMode* mode_info = output->display->native_mode();
if (!mode_info)
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(mode_info->size().width() - width) <= 1.0 &&
std::abs(mode_info->size().height() - height) <= 1.0) {
output->touch_device_id = info[i].deviceid;
VLOG(2) << "Found touchscreen for output #" << k << " id "
<< output->touch_device_id << " width " << width << " height "
<< height;
break;
}
}
if (k == outputs->size()) {
no_match_touchscreen.insert(info[i].deviceid);
VLOG(2) << "No matching output for touchscreen"
<< " id " << info[i].deviceid << " width " << width
<< " height " << height;
}
}
}
// 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 < outputs->size(); i++) {
if ((*outputs)[i].display->type() != DISPLAY_CONNECTION_TYPE_INTERNAL &&
(*outputs)[i].display->native_mode() != NULL &&
(*outputs)[i].touch_device_id == None) {
(*outputs)[i].touch_device_id = *it;
VLOG(2) << "Arbitrarily matching touchscreen "
<< (*outputs)[i].touch_device_id << " to output #" << i;
break;
}
}
}
XIFreeDeviceInfo(info);
}
void TouchscreenDelegateX11::ConfigureCTM(
int touch_device_id,
const DisplayConfigurator::CoordinateTransformation& ctm) {
VLOG(1) << "ConfigureCTM: id=" << touch_device_id << " scale=" << ctm.x_scale
<< "x" << ctm.y_scale << " offset=(" << ctm.x_offset << ", "
<< ctm.y_offset << ")";
int ndevices = 0;
XIDeviceInfo* info = XIQueryDevice(display_, touch_device_id, &ndevices);
Atom prop = XInternAtom(display_, "Coordinate Transformation Matrix", False);
Atom float_atom = XInternAtom(display_, "FLOAT", False);
if (ndevices == 1 && prop != None && float_atom != None) {
Atom type;
int format;
unsigned long num_items;
unsigned long bytes_after;
unsigned char* data = NULL;
// Verify that the property exists with correct format, type, etc.
int status = XIGetProperty(display_,
info->deviceid,
prop,
0,
0,
False,
AnyPropertyType,
&type,
&format,
&num_items,
&bytes_after,
&data);
if (data)
XFree(data);
if (status == Success && type == float_atom && format == 32) {
float value[3][3] = {
{ ctm.x_scale, 0.0, ctm.x_offset },
{ 0.0, ctm.y_scale, ctm.y_offset },
{ 0.0, 0.0, 1.0 }
};
XIChangeProperty(display_,
info->deviceid,
prop,
type,
format,
PropModeReplace,
reinterpret_cast<unsigned char*>(value),
9);
}
}
XIFreeDeviceInfo(info);
}
} // namespace ui
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