Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / ui / events / ozone / evdev / touch_event_converter_evdev.cc
blob8d6a0b5568ca6228527030965ca1abe59352d2f6
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.
5 #include "ui/events/ozone/evdev/touch_event_converter_evdev.h"
7 #include <errno.h>
8 #include <fcntl.h>
9 #include <linux/input.h>
10 #include <poll.h>
11 #include <stdio.h>
12 #include <unistd.h>
14 #include <cmath>
15 #include <limits>
17 #include "base/bind.h"
18 #include "base/callback.h"
19 #include "base/command_line.h"
20 #include "base/logging.h"
21 #include "base/memory/scoped_vector.h"
22 #include "base/message_loop/message_loop.h"
23 #include "base/strings/string_number_conversions.h"
24 #include "base/strings/string_util.h"
25 #include "base/strings/stringprintf.h"
26 #include "ui/events/event.h"
27 #include "ui/events/event_constants.h"
28 #include "ui/events/event_switches.h"
29 #include "ui/gfx/screen.h"
31 namespace {
33 struct TouchCalibration {
34 int bezel_left;
35 int bezel_right;
36 int bezel_top;
37 int bezel_bottom;
40 void GetTouchCalibration(TouchCalibration* cal) {
41 std::vector<std::string> parts;
42 if (Tokenize(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
43 switches::kTouchCalibration),
44 ",",
45 &parts) >= 4) {
46 if (!base::StringToInt(parts[0], &cal->bezel_left))
47 DLOG(ERROR) << "Incorrect left border calibration value passed.";
48 if (!base::StringToInt(parts[1], &cal->bezel_right))
49 DLOG(ERROR) << "Incorrect right border calibration value passed.";
50 if (!base::StringToInt(parts[2], &cal->bezel_top))
51 DLOG(ERROR) << "Incorrect top border calibration value passed.";
52 if (!base::StringToInt(parts[3], &cal->bezel_bottom))
53 DLOG(ERROR) << "Incorrect bottom border calibration value passed.";
57 float TuxelsToPixels(float val,
58 float min_tuxels,
59 float num_tuxels,
60 float min_pixels,
61 float num_pixels) {
62 // Map [min_tuxels, min_tuxels + num_tuxels) to
63 // [min_pixels, min_pixels + num_pixels).
64 return min_pixels + (val - min_tuxels) * num_pixels / num_tuxels;
67 float TuxelToPixelSize(float val, float num_tuxels, float num_pixels) {
68 return val * num_pixels / num_tuxels;
71 } // namespace
73 namespace ui {
75 TouchEventConverterEvdev::TouchEventConverterEvdev(
76 int fd,
77 base::FilePath path,
78 const EventDeviceInfo& info,
79 const EventDispatchCallback& callback)
80 : EventConverterEvdev(callback),
81 syn_dropped_(false),
82 is_type_a_(false),
83 current_slot_(0),
84 fd_(fd),
85 path_(path) {
86 Init(info);
89 TouchEventConverterEvdev::~TouchEventConverterEvdev() {
90 Stop();
91 close(fd_);
94 void TouchEventConverterEvdev::Init(const EventDeviceInfo& info) {
95 gfx::Screen *screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
96 if (!screen)
97 return; // No scaling.
98 gfx::Display display = screen->GetPrimaryDisplay();
99 gfx::Size size = display.GetSizeInPixel();
101 pressure_min_ = info.GetAbsMinimum(ABS_MT_PRESSURE),
102 pressure_max_ = info.GetAbsMaximum(ABS_MT_PRESSURE),
103 x_min_tuxels_ = info.GetAbsMinimum(ABS_MT_POSITION_X),
104 x_num_tuxels_ = info.GetAbsMaximum(ABS_MT_POSITION_X) - x_min_tuxels_ + 1,
105 y_min_tuxels_ = info.GetAbsMinimum(ABS_MT_POSITION_Y),
106 y_num_tuxels_ = info.GetAbsMaximum(ABS_MT_POSITION_Y) - y_min_tuxels_ + 1,
107 x_min_pixels_ = x_min_tuxels_,
108 x_num_pixels_ = x_num_tuxels_,
109 y_min_pixels_ = y_min_tuxels_,
110 y_num_pixels_ = y_num_tuxels_,
112 // Map coordinates onto screen.
113 x_min_pixels_ = 0;
114 y_min_pixels_ = 0;
115 x_num_pixels_ = size.width();
116 y_num_pixels_ = size.height();
118 VLOG(1) << "mapping touch coordinates to screen coordinates: "
119 << base::StringPrintf("%dx%d", size.width(), size.height());
121 // Apply --touch-calibration.
122 TouchCalibration cal = {};
123 GetTouchCalibration(&cal);
124 x_min_tuxels_ += cal.bezel_left;
125 x_num_tuxels_ -= cal.bezel_left + cal.bezel_right;
126 y_min_tuxels_ += cal.bezel_top;
127 y_num_tuxels_ -= cal.bezel_top + cal.bezel_bottom;
129 VLOG(1) << "applying touch calibration: "
130 << base::StringPrintf("[%d, %d, %d, %d]",
131 cal.bezel_left,
132 cal.bezel_right,
133 cal.bezel_top,
134 cal.bezel_bottom);
137 void TouchEventConverterEvdev::Start() {
138 base::MessageLoopForUI::current()->WatchFileDescriptor(
139 fd_, true, base::MessagePumpLibevent::WATCH_READ, &controller_, this);
142 void TouchEventConverterEvdev::Stop() {
143 controller_.StopWatchingFileDescriptor();
146 bool TouchEventConverterEvdev::Reinitialize() {
147 EventDeviceInfo info;
148 if (info.Initialize(fd_)) {
149 Init(info);
150 return true;
152 return false;
155 void TouchEventConverterEvdev::OnFileCanWriteWithoutBlocking(int /* fd */) {
156 // Read-only file-descriptors.
157 NOTREACHED();
160 void TouchEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
161 input_event inputs[MAX_FINGERS * 6 + 1];
162 ssize_t read_size = read(fd, inputs, sizeof(inputs));
163 if (read_size < 0) {
164 if (errno == EINTR || errno == EAGAIN)
165 return;
166 if (errno != ENODEV)
167 PLOG(ERROR) << "error reading device " << path_.value();
168 Stop();
169 return;
172 for (unsigned i = 0; i < read_size / sizeof(*inputs); i++) {
173 ProcessInputEvent(inputs[i]);
177 void TouchEventConverterEvdev::ProcessInputEvent(const input_event& input) {
178 if (input.type == EV_SYN) {
179 ProcessSyn(input);
180 } else if(syn_dropped_) {
181 // Do nothing. This branch indicates we have lost sync with the driver.
182 } else if (input.type == EV_ABS) {
183 if (current_slot_ >= MAX_FINGERS) {
184 LOG(ERROR) << "too many touch events: " << current_slot_;
185 return;
187 ProcessAbs(input);
188 } else if (input.type == EV_KEY) {
189 switch (input.code) {
190 case BTN_TOUCH:
191 break;
192 default:
193 NOTIMPLEMENTED() << "invalid code for EV_KEY: " << input.code;
195 } else {
196 NOTIMPLEMENTED() << "invalid type: " << input.type;
200 void TouchEventConverterEvdev::ProcessAbs(const input_event& input) {
201 switch (input.code) {
202 case ABS_MT_TOUCH_MAJOR:
203 altered_slots_.set(current_slot_);
204 // TODO(spang): If we have all of major, minor, and orientation,
205 // we can scale the ellipse correctly. However on the Pixel we get
206 // neither minor nor orientation, so this is all we can do.
207 events_[current_slot_].radius_x_ =
208 TuxelToPixelSize(input.value, x_num_tuxels_, x_num_pixels_) / 2.0f;
209 break;
210 case ABS_MT_TOUCH_MINOR:
211 altered_slots_.set(current_slot_);
212 events_[current_slot_].radius_y_ =
213 TuxelToPixelSize(input.value, y_num_tuxels_, y_num_pixels_) / 2.0f;
214 break;
215 case ABS_MT_POSITION_X:
216 altered_slots_.set(current_slot_);
217 events_[current_slot_].x_ = TuxelsToPixels(input.value,
218 x_min_tuxels_,
219 x_num_tuxels_,
220 x_min_pixels_,
221 x_num_pixels_);
222 break;
223 case ABS_MT_POSITION_Y:
224 altered_slots_.set(current_slot_);
225 events_[current_slot_].y_ = TuxelsToPixels(input.value,
226 y_min_tuxels_,
227 y_num_tuxels_,
228 y_min_pixels_,
229 y_num_pixels_);
230 break;
231 case ABS_MT_TRACKING_ID:
232 altered_slots_.set(current_slot_);
233 if (input.value < 0) {
234 events_[current_slot_].type_ = ET_TOUCH_RELEASED;
235 } else {
236 events_[current_slot_].finger_ = input.value;
237 events_[current_slot_].type_ = ET_TOUCH_PRESSED;
239 break;
240 case ABS_MT_PRESSURE:
241 altered_slots_.set(current_slot_);
242 events_[current_slot_].pressure_ = input.value - pressure_min_;
243 events_[current_slot_].pressure_ /= pressure_max_ - pressure_min_;
244 break;
245 case ABS_MT_SLOT:
246 current_slot_ = input.value;
247 altered_slots_.set(current_slot_);
248 break;
249 default:
250 DVLOG(5) << "unhandled code for EV_ABS: " << input.code;
254 void TouchEventConverterEvdev::ProcessSyn(const input_event& input) {
255 switch (input.code) {
256 case SYN_REPORT:
257 if (syn_dropped_) {
258 // Have to re-initialize.
259 if (Reinitialize()) {
260 syn_dropped_ = false;
261 altered_slots_.reset();
262 } else {
263 LOG(ERROR) << "failed to re-initialize device info";
265 } else {
266 ReportEvents(base::TimeDelta::FromMicroseconds(
267 input.time.tv_sec * 1000000 + input.time.tv_usec));
269 if (is_type_a_)
270 current_slot_ = 0;
271 break;
272 case SYN_MT_REPORT:
273 // For type A devices, we just get a stream of all current contacts,
274 // in some arbitrary order.
275 events_[current_slot_++].type_ = ET_TOUCH_PRESSED;
276 is_type_a_ = true;
277 break;
278 case SYN_DROPPED:
279 // Some buffer has overrun. We ignore all events up to and
280 // including the next SYN_REPORT.
281 syn_dropped_ = true;
282 break;
283 default:
284 NOTIMPLEMENTED() << "invalid code for EV_SYN: " << input.code;
288 void TouchEventConverterEvdev::ReportEvents(base::TimeDelta delta) {
289 for (int i = 0; i < MAX_FINGERS; i++) {
290 if (altered_slots_[i]) {
291 // TODO(rikroege): Support elliptical finger regions.
292 TouchEvent evt(events_[i].type_,
293 gfx::PointF(events_[i].x_, events_[i].y_),
294 /* flags */ 0,
295 /* touch_id */ events_[i].finger_,
296 delta,
297 /* radius_x */ events_[i].radius_x_,
298 /* radius_y */ events_[i].radius_y_,
299 /* angle */ 0.,
300 events_[i].pressure_);
301 DispatchEventToCallback(&evt);
303 // Subsequent events for this finger will be touch-move until it
304 // is released.
305 events_[i].type_ = ET_TOUCH_MOVED;
308 altered_slots_.reset();
311 } // namespace ui