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weston/clients/calibrator.c

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/*
* Copyright © 2012 Intel Corporation
*
* 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 (including the next
* paragraph) 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 "config.h"
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cairo.h>
#include <math.h>
#include <assert.h>
#include <getopt.h>
#include <errno.h>
#include <linux/input.h>
#include <wayland-client.h>
#include "window.h"
#include "shared/helpers.h"
#include <libweston/matrix.h>
/* Our points for the calibration must be not be on a line */
static const struct {
float x_ratio, y_ratio;
} test_ratios[] = {
{ 0.20, 0.40 },
{ 0.80, 0.60 },
{ 0.40, 0.80 }
};
struct calibrator {
struct tests {
int32_t drawn_x, drawn_y;
int32_t clicked_x, clicked_y;
} tests[ARRAY_LENGTH(test_ratios)];
int current_test;
struct display *display;
struct window *window;
struct widget *widget;
};
/*
* Calibration algorithm:
*
* The equation we want to apply at event time where x' and y' are the
* calibrated co-ordinates.
*
* x' = Ax + By + C
* y' = Dx + Ey + F
*
* For example "zero calibration" would be A=1.0 B=0.0 C=0.0, D=0.0, E=1.0,
* and F=0.0.
*
* With 6 unknowns we need 6 equations to find the constants:
*
* x1' = Ax1 + By1 + C
* y1' = Dx1 + Ey1 + F
* ...
* x3' = Ax3 + By3 + C
* y3' = Dx3 + Ey3 + F
*
* In matrix form:
*
* x1' x1 y1 1 A
* x2' = x2 y2 1 x B
* x3' x3 y3 1 C
*
* So making the matrix M we can find the constants with:
*
* A x1'
* B = M^-1 x x2'
* C x3'
*
* (and similarly for D, E and F)
*
* For the calibration the desired values x, y are the same values at which
* we've drawn at.
*
*/
static void
finish_calibration (struct calibrator *calibrator)
{
struct weston_matrix m;
struct weston_matrix inverse;
struct weston_vector x_calib, y_calib;
int i;
/*
* x1 y1 1 0
* x2 y2 1 0
* x3 y3 1 0
* 0 0 0 1
*/
memset(&m, 0, sizeof(m));
for (i = 0; i < (int)ARRAY_LENGTH(test_ratios); i++) {
m.d[i] = calibrator->tests[i].clicked_x;
m.d[i + 4] = calibrator->tests[i].clicked_y;
m.d[i + 8] = 1;
}
m.d[15] = 1;
weston_matrix_invert(&inverse, &m);
memset(&x_calib, 0, sizeof(x_calib));
memset(&y_calib, 0, sizeof(y_calib));
for (i = 0; i < (int)ARRAY_LENGTH(test_ratios); i++) {
x_calib.f[i] = calibrator->tests[i].drawn_x;
y_calib.f[i] = calibrator->tests[i].drawn_y;
}
/* Multiples into the vector */
weston_matrix_transform(&inverse, &x_calib);
weston_matrix_transform(&inverse, &y_calib);
printf ("Calibration values: %f %f %f %f %f %f\n",
x_calib.f[0], x_calib.f[1], x_calib.f[2],
y_calib.f[0], y_calib.f[1], y_calib.f[2]);
exit(0);
}
static void
button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct calibrator *calibrator = data;
int32_t x, y;
if (state == WL_POINTER_BUTTON_STATE_PRESSED && button == BTN_LEFT) {
input_get_position(input, &x, &y);
calibrator->tests[calibrator->current_test].clicked_x = x;
calibrator->tests[calibrator->current_test].clicked_y = y;
calibrator->current_test--;
if (calibrator->current_test < 0)
finish_calibration(calibrator);
}
widget_schedule_redraw(widget);
}
static void
touch_handler(struct widget *widget, struct input *input, uint32_t serial,
uint32_t time, int32_t id, float x, float y, void *data)
{
struct calibrator *calibrator = data;
calibrator->tests[calibrator->current_test].clicked_x = x;
calibrator->tests[calibrator->current_test].clicked_y = y;
calibrator->current_test--;
if (calibrator->current_test < 0)
finish_calibration(calibrator);
widget_schedule_redraw(widget);
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct calibrator *calibrator = data;
struct rectangle allocation;
cairo_surface_t *surface;
cairo_t *cr;
int32_t drawn_x, drawn_y;
widget_get_allocation(calibrator->widget, &allocation);
surface = window_get_surface(calibrator->window);
cr = cairo_create(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
cairo_paint(cr);
drawn_x = test_ratios[calibrator->current_test].x_ratio * allocation.width;
drawn_y = test_ratios[calibrator->current_test].y_ratio * allocation.height;
calibrator->tests[calibrator->current_test].drawn_x = drawn_x;
calibrator->tests[calibrator->current_test].drawn_y = drawn_y;
cairo_translate(cr, drawn_x, drawn_y);
cairo_set_line_width(cr, 2.0);
cairo_set_source_rgb(cr, 1.0, 0.0, 0.0);
cairo_move_to(cr, 0, -10.0);
cairo_line_to(cr, 0, 10.0);
cairo_stroke(cr);
cairo_move_to(cr, -10.0, 0);
cairo_line_to(cr, 10.0, 0.0);
cairo_stroke(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static struct calibrator *
calibrator_create(struct display *display, bool enable_button)
{
struct calibrator *calibrator;
calibrator = malloc(sizeof *calibrator);
if (calibrator == NULL)
return NULL;
calibrator->window = window_create(display);
calibrator->widget = window_add_widget(calibrator->window, calibrator);
window_set_title(calibrator->window, "Wayland calibrator");
window_set_appid(calibrator->window,
"org.freedesktop.weston.wayland-calibrator");
calibrator->display = display;
calibrator->current_test = ARRAY_LENGTH(test_ratios) - 1;
if (enable_button)
widget_set_button_handler(calibrator->widget, button_handler);
widget_set_touch_down_handler(calibrator->widget, touch_handler);
widget_set_redraw_handler(calibrator->widget, redraw_handler);
window_set_fullscreen(calibrator->window, 1);
return calibrator;
}
static void
calibrator_destroy(struct calibrator *calibrator)
{
widget_destroy(calibrator->widget);
window_destroy(calibrator->window);
free(calibrator);
}
static void
help(const char *name)
{
fprintf(stderr, "Usage: %s [args...]\n", name);
fprintf(stderr, " -m, --enable-mouse Enable mouse for testing the touchscreen\n");
fprintf(stderr, " -h, --help Display this help message\n");
}
int
main(int argc, char *argv[])
{
struct display *display;
struct calibrator *calibrator;
int c;
bool enable_mouse = 0;
struct option opts[] = {
{ "enable-mouse", no_argument, NULL, 'm' },
{ "help", no_argument, NULL, 'h' },
{ 0, 0, NULL, 0 }
};
while ((c = getopt_long(argc, argv, "mh", opts, NULL)) != -1) {
switch (c) {
case 'm':
enable_mouse = 1;
break;
case 'h':
help(argv[0]);
exit(EXIT_FAILURE);
default:
break;
}
}
display = display_create(&argc, argv);
if (display == NULL) {
fprintf(stderr, "failed to create display: %s\n",
strerror(errno));
return -1;
}
calibrator = calibrator_create(display, enable_mouse);
if (!calibrator)
return -1;
display_run(display);
calibrator_destroy(calibrator);
display_destroy(display);
return 0;
}
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