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calibrator.cpp
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calibrator.cpp
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/*
* Copyright (c) 2009 Tias Guns
* Copyright (c) 2009 Soren Hauberg
* Copyright (c) 2011 Antoine Hue
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <algorithm>
#include <sys/types.h>
#include <dirent.h>
#include <iostream>
#include <fstream>
#include <cstring>
#include <stdarg.h>
#include "calibrator.hh"
// static instance
bool Calibrator::verbose = false;
Calibrator::Calibrator(const char* const device_name0, const XYinfo& axys0,
const int thr_misclick, const int thr_doubleclick, const OutputType output_type0, const char* geometry0)
: device_name(device_name0),
threshold_doubleclick(thr_doubleclick), threshold_misclick(thr_misclick),
output_type(output_type0), geometry(geometry0)
{
old_axys = axys0;
clicked.num = 0;
//clicked.x(NUM_POINTS);
//clicked.y(NUM_POINTS);
}
bool Calibrator::add_click(int x, int y)
{
// Double-click detection
if (threshold_doubleclick > 0 && clicked.num > 0) {
int i = clicked.num - 1;
while (i >= 0) {
if (abs(x - clicked.x[i]) <= threshold_doubleclick
&& abs(y - clicked.y[i]) <= threshold_doubleclick) {
if (verbose) {
trace ( "Not adding click %i (X=%i, Y=%i): within %i pixels of previous click\n",
clicked.num, x, y, threshold_doubleclick);
}
return false;
}
i--;
}
}
// Mis-click detection
if (threshold_misclick > 0 && clicked.num > 0) {
bool misclick = true;
switch (clicked.num) {
case 1:
// check that along one axis of first point
if (along_axis(x,clicked.x[UL],clicked.y[UL]) ||
along_axis(y,clicked.x[UL],clicked.y[UL]))
{
misclick = false;
} else {
trace ( "Mis-click detected, click %i (X=%i, Y=%i) not aligned with click 0 (X=%i, Y=%i) (threshold=%i)\n",
clicked.num, x, y, clicked.x[UL], clicked.y[UL], threshold_misclick);
}
break;
case 2:
// check that along other axis of first point than second point
if ((along_axis( y, clicked.x[UL], clicked.y[UL])
&& along_axis( clicked.x[UR], clicked.x[UL], clicked.y[UL]))
|| (along_axis( x, clicked.x[UL], clicked.y[UL])
&& along_axis( clicked.y[UR], clicked.x[UL], clicked.y[UL])))
{
misclick = false;
} else {
trace ( "Mis-click detected, click %i (X=%i, Y=%i) not aligned with click 0 (X=%i, Y=%i) or click 1 (X=%i, Y=%i) (threshold=%i)\n",
clicked.num, x, y, clicked.x[UL], clicked.y[UL], clicked.x[UR], clicked.y[UR], threshold_misclick);
}
break;
case 3:
// check that along both axis of second and third point
if ( ( along_axis( x, clicked.x[UR], clicked.y[UR])
&& along_axis( y, clicked.x[LL], clicked.y[LL]) )
||( along_axis( y, clicked.x[UR], clicked.y[UR])
&& along_axis( x, clicked.x[LL], clicked.y[LL]) ) )
{
misclick = false;
} else {
trace ( "Mis-click detected, click %i (X=%i, Y=%i) not aligned with click 1 (X=%i, Y=%i) or click 2 (X=%i, Y=%i) (threshold=%i)\n",
clicked.num, x, y, clicked.x[UR], clicked.y[UR], clicked.x[LL], clicked.y[LL], threshold_misclick);
}
}
if (misclick) {
reset();
return false;
}
}
clicked.x.push_back(x);
clicked.y.push_back(y);
clicked.num++;
trace("Adding click %i (X=%i, Y=%i)\n", clicked.num-1, x, y);
return true;
}
inline bool Calibrator::along_axis(int xy, int x0, int y0)
{
return ((abs(xy - x0) <= threshold_misclick) ||
(abs(xy - y0) <= threshold_misclick));
}
/// Compute calibration on 1 axis
/// (all +0.5 for float to int rounding)
void Calibrator::process_axys( int screen_dim, const AxisInfo &previous, std::vector<int> &clicked, AxisInfo &updated )
{
// These are scaled using the values of old_axys
const float old_scale = (previous.max - previous.min)/(float)screen_dim;
// Sort to get lowest two and highest two whatever is the orientation
std::sort( clicked.begin(), clicked.end());
// If inverted, must undo inversion since calibration is before in evdev driver.
if ( previous.invert ) {
updated.min = ( (2*screen_dim - clicked[2] - clicked[3]) * old_scale/2 ) + previous.min + 0.5;
updated.max = ( (2*screen_dim - clicked[0] - clicked[1]) * old_scale/2 ) + previous.min + 0.5;
} else {
updated.min = ( (clicked[0] + clicked[1]) * old_scale/2 ) + previous.min + 0.5;
updated.max = ( (clicked[2] + clicked[3]) * old_scale/2 ) + previous.min + 0.5;
}
// Add/subtract the offset that comes from not having the points in the
// corners (using the new scale, assumed better than previous)
const int new_delta = (updated.max - updated.min) / (float)(num_blocks - 2) + 0.5;
updated.min -= new_delta;
updated.max += new_delta;
}
// Compute calibration and correct orientation from captured coordinates
bool Calibrator::finish(int width, int height)
{
if (get_numclicks() != NUM_POINTS) {
return false;
}
trace ( "Screen size=%dx%d\n", width, height );
trace ( "Expected screen coordinates, x.min=%d, x.max=%d, y.min=%d, y.max=%d\n",
width/num_blocks, width-width/num_blocks,
height/num_blocks, height - height/num_blocks);
// Evdev v2.3.2 order to compute coordinates from peripheral to screen:
// - swap xy axis
// - calibration (offset and scale)
// - invert x, invert y axis
trace ( "Previous orientation: swap_xy=%d, invert_x=%d, invert_y=%d\n", old_axys.swap_xy, old_axys.x.invert, old_axys.y.invert );
// Compute orientation modifications from existing (if orientation is already corrected, no change)
// Start reverse order vs. evdev: from screen to peripheral
// Check if axes are inverted ?
bool invert_x = false, invert_y = false;
if ( clicked.x[UL] > clicked.x[LR] ) {
invert_x = true;
}
if ( clicked.y[UL] > clicked.y[LR] ) {
invert_y = true;
}
XYinfo new_axys; // new axys origin and scaling
// Should x and y be swapped
const bool swap_xy = (abs (clicked.x [UL] - clicked.x [UR]) < abs (clicked.y [UL] - clicked.y [UR]));
trace ( "Orientation modifications: swap_xy=%d, invert_x=%d, invert_y=%d\n", swap_xy, invert_x, invert_y);
/// Compute calibration
if (swap_xy) {
process_axys( height, old_axys.x, clicked.y, new_axys.x );
process_axys( width, old_axys.y, clicked.x, new_axys.y );
} else {
process_axys( width, old_axys.x, clicked.x, new_axys.x );
process_axys( height, old_axys.y, clicked.y, new_axys.y );
}
new_axys.swap_xy = old_axys.swap_xy ^ swap_xy;
new_axys.x.invert = old_axys.x.invert ^ invert_x;
new_axys.y.invert = old_axys.y.invert ^ invert_y;
trace ( "New orientation: swap_xy=%d, invert_x=%d, invert_y=%d\n", new_axys.swap_xy, new_axys.x.invert, new_axys.y.invert );
// finish the data, driver/calibrator specific
return finish_data(new_axys);
}
const char* Calibrator::get_sysfs_name()
{
if (is_sysfs_name(device_name))
return device_name;
// TODO: more mechanisms
return NULL;
}
bool Calibrator::is_sysfs_name(const char* name) {
const char* SYSFS_INPUT="/sys/class/input";
const char* SYSFS_DEVNAME="device/name";
DIR* dp = opendir(SYSFS_INPUT);
if (dp == NULL)
return false;
while (dirent* ep = readdir(dp)) {
if (strncmp(ep->d_name, "event", strlen("event")) == 0) {
// got event name, get its sysfs device name
char filename[40]; // actually 35, but hey...
(void) sprintf(filename, "%s/%s/%s", SYSFS_INPUT, ep->d_name, SYSFS_DEVNAME);
std::ifstream ifile(filename);
if (ifile.is_open()) {
if (!ifile.eof()) {
std::string devname;
std::getline(ifile, devname);
if (devname == name) {
trace("Found that '%s' is a sysfs name.\n", name);
return true;
}
}
ifile.close();
}
}
}
(void) closedir(dp);
trace ("Name '%s' does not match any in '%s/event*/%s'\n",
name, SYSFS_INPUT, SYSFS_DEVNAME);
return false;
}
bool Calibrator::has_xorgconfd_support(Display* dpy) {
bool has_support = false;
Display* display = dpy;
if (dpy == NULL) // no connection to reuse
display = XOpenDisplay(NULL);
if (display == NULL) {
error ( "Unable to connect to X server\n");
exit(1);
}
if (strstr(ServerVendor(display), "X.Org") &&
VendorRelease(display) >= 10800000) {
has_support = true;
}
if (dpy == NULL) // no connection to reuse
XCloseDisplay(display);
return has_support;
}
/// Write calibration output (to stdout)
void Calibrator::output ( const char *format, ... )
{
va_list vl;
va_start ( vl, format );
vprintf ( format, vl );
va_end ( vl );
}
/// Dump debug information if verbose activated
void Calibrator::trace ( const char *format, ...)
{
if ( verbose == true ) {
printf ( "DEBUG: ");
va_list vl;
va_start ( vl, format );
vprintf ( format, vl );
va_end ( vl );
}
}
/// Information to user, if verbose mode activated
void Calibrator::info ( const char *format, ... )
{
if ( verbose == true ) {
printf ( "INFO: ");
va_list vl;
va_start ( vl, format );
vprintf ( format, vl );
va_end ( vl );
}
}
/// Error (non fatal)
void Calibrator::error ( const char *format, ...)
{
fprintf ( stderr, "ERROR: ");
va_list vl;
va_start ( vl, format );
vprintf ( format, vl );
va_end ( vl );
}