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weston/libweston/touch-calibration.c

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/*
* Copyright 2017-2018 Collabora, Ltd.
* Copyright 2017-2018 General Electric Company
*
* 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 <string.h>
#include <wayland-server.h>
#include "shared/helpers.h"
#include "shared/string-helpers.h"
#include <libweston/zalloc.h>
#include "shared/timespec-util.h"
#include <libweston/libweston.h>
#include "libweston-internal.h"
#include "backend.h"
#include "weston-touch-calibration-server-protocol.h"
struct weston_touch_calibrator {
struct wl_resource *resource;
struct weston_compositor *compositor;
struct weston_surface *surface;
struct wl_listener surface_destroy_listener;
struct wl_listener surface_commit_listener;
struct weston_touch_device *device;
struct wl_listener device_destroy_listener;
struct weston_output *output;
struct wl_listener output_destroy_listener;
struct weston_view *view;
/** The calibration procedure has been cancelled. */
bool calibration_cancelled;
/** The current touch sequence has been cancelled. */
bool touch_cancelled;
};
static struct weston_touch_calibrator *
calibrator_from_device(struct weston_touch_device *device)
{
return device->aggregate->seat->compositor->touch_calibrator;
}
static uint32_t
wire_uint_from_double(double c)
{
assert(c >= 0.0);
assert(c <= 1.0);
return round(c * 0xffffffff);
}
static bool
normalized_is_valid(const struct weston_point2d_device_normalized *p)
{
return p->x >= 0.0 && p->x <= 1.0 &&
p->y >= 0.0 && p->y <= 1.0;
}
WL_EXPORT void
notify_touch_calibrator(struct weston_touch_device *device,
const struct timespec *time, int32_t slot,
const struct weston_point2d_device_normalized *norm,
int touch_type)
{
struct weston_touch_calibrator *calibrator;
struct wl_resource *res;
uint32_t msecs;
uint32_t x = 0;
uint32_t y = 0;
calibrator = calibrator_from_device(device);
if (!calibrator)
return;
res = calibrator->resource;
/* Ignore any touch events coming from another device */
if (device != calibrator->device) {
if (touch_type == WL_TOUCH_DOWN)
weston_touch_calibrator_send_invalid_touch(res);
return;
}
/* Ignore all events if we have sent 'cancel' event until all
* touches (on the seat) are up.
*/
if (calibrator->touch_cancelled) {
if (calibrator->device->aggregate->num_tp == 0) {
assert(touch_type == WL_TOUCH_UP);
calibrator->touch_cancelled = false;
}
return;
}
msecs = timespec_to_msec(time);
if (touch_type != WL_TOUCH_UP) {
if (normalized_is_valid(norm)) {
x = wire_uint_from_double(norm->x);
y = wire_uint_from_double(norm->y);
} else {
/* Coordinates are out of bounds */
if (touch_type == WL_TOUCH_MOTION) {
weston_touch_calibrator_send_cancel(res);
calibrator->touch_cancelled = true;
}
weston_touch_calibrator_send_invalid_touch(res);
return;
}
}
switch (touch_type) {
case WL_TOUCH_UP:
weston_touch_calibrator_send_up(res, msecs, slot);
break;
case WL_TOUCH_DOWN:
weston_touch_calibrator_send_down(res, msecs, slot, x, y);
break;
case WL_TOUCH_MOTION:
weston_touch_calibrator_send_motion(res, msecs, slot, x, y);
break;
default:
return;
}
}
WL_EXPORT void
notify_touch_calibrator_frame(struct weston_touch_device *device)
{
struct weston_touch_calibrator *calibrator;
calibrator = calibrator_from_device(device);
if (!calibrator)
return;
weston_touch_calibrator_send_frame(calibrator->resource);
}
WL_EXPORT void
notify_touch_calibrator_cancel(struct weston_touch_device *device)
{
struct weston_touch_calibrator *calibrator;
calibrator = calibrator_from_device(device);
if (!calibrator)
return;
weston_touch_calibrator_send_cancel(calibrator->resource);
}
static void
map_calibrator(struct weston_touch_calibrator *calibrator)
{
struct weston_compositor *c = calibrator->compositor;
struct weston_touch_device *device = calibrator->device;
static const struct weston_touch_device_matrix identity = {
.m = { 1, 0, 0, 0, 1, 0}
};
assert(!calibrator->view);
assert(calibrator->output);
assert(calibrator->surface);
assert(calibrator->surface->resource);
calibrator->view = weston_view_create(calibrator->surface);
if (!calibrator->view) {
wl_resource_post_no_memory(calibrator->surface->resource);
return;
}
weston_layer_entry_insert(&c->calibrator_layer.view_list,
&calibrator->view->layer_link);
weston_view_set_position(calibrator->view,
calibrator->output->x,
calibrator->output->y);
calibrator->view->output = calibrator->surface->output;
calibrator->view->is_mapped = true;
calibrator->surface->output = calibrator->output;
calibrator->surface->is_mapped = true;
weston_output_schedule_repaint(calibrator->output);
device->ops->get_calibration(device, &device->saved_calibration);
device->ops->set_calibration(device, &identity);
}
static void
unmap_calibrator(struct weston_touch_calibrator *calibrator)
{
struct weston_touch_device *device = calibrator->device;
wl_list_remove(&calibrator->surface_commit_listener.link);
wl_list_init(&calibrator->surface_commit_listener.link);
if (!calibrator->view)
return;
weston_view_destroy(calibrator->view);
calibrator->view = NULL;
weston_surface_unmap(calibrator->surface);
/* Reload saved calibration */
if (device)
device->ops->set_calibration(device,
&device->saved_calibration);
}
void
touch_calibrator_mode_changed(struct weston_compositor *compositor)
{
struct weston_touch_calibrator *calibrator;
calibrator = compositor->touch_calibrator;
if (!calibrator)
return;
if (calibrator->calibration_cancelled)
return;
if (compositor->touch_mode == WESTON_TOUCH_MODE_CALIB)
map_calibrator(calibrator);
}
static void
touch_calibrator_surface_committed(struct wl_listener *listener, void *data)
{
struct weston_touch_calibrator *calibrator =
container_of(listener, struct weston_touch_calibrator,
surface_commit_listener);
struct weston_surface *surface = calibrator->surface;
wl_list_remove(&calibrator->surface_commit_listener.link);
wl_list_init(&calibrator->surface_commit_listener.link);
if (surface->width != calibrator->output->width ||
surface->height != calibrator->output->height) {
wl_resource_post_error(calibrator->resource,
WESTON_TOUCH_CALIBRATOR_ERROR_BAD_SIZE,
"calibrator surface size does not match");
return;
}
weston_compositor_set_touch_mode_calib(calibrator->compositor);
/* results in call to touch_calibrator_mode_changed() */
}
static void
touch_calibrator_convert(struct wl_client *client,
struct wl_resource *resource,
int32_t x,
int32_t y,
uint32_t coordinate_id)
{
struct weston_touch_calibrator *calibrator;
struct wl_resource *coordinate_resource;
struct weston_output *output;
struct weston_surface *surface;
uint32_t version;
struct weston_vector p = { { 0.0, 0.0, 0.0, 1.0 } };
struct weston_point2d_device_normalized norm;
version = wl_resource_get_version(resource);
calibrator = wl_resource_get_user_data(resource);
surface = calibrator->surface;
output = calibrator->output;
coordinate_resource =
wl_resource_create(client, &weston_touch_coordinate_interface,
version, coordinate_id);
if (!coordinate_resource) {
wl_client_post_no_memory(client);
return;
}
if (calibrator->calibration_cancelled) {
weston_touch_coordinate_send_result(coordinate_resource, 0, 0);
wl_resource_destroy(coordinate_resource);
return;
}
if (!surface || !surface->is_mapped) {
wl_resource_post_error(resource,
WESTON_TOUCH_CALIBRATOR_ERROR_NOT_MAPPED,
"calibrator surface is not mapped");
return;
}
assert(calibrator->view);
assert(output);
if (x < 0 || y < 0 || x >= surface->width || y >= surface->height) {
wl_resource_post_error(resource,
WESTON_TOUCH_CALIBRATOR_ERROR_BAD_COORDINATES,
"convert(%d, %d) input is out of bounds",
x, y);
return;
}
/* Convert from surface-local coordinates into global, from global
* into output-raw, do perspective division and normalize.
*/
weston_view_to_global_float(calibrator->view, x, y, &p.f[0], &p.f[1]);
weston_matrix_transform(&output->matrix, &p);
norm.x = p.f[0] / (p.f[3] * output->current_mode->width);
norm.y = p.f[1] / (p.f[3] * output->current_mode->height);
if (!normalized_is_valid(&norm)) {
wl_resource_post_error(resource,
WESTON_TOUCH_CALIBRATOR_ERROR_BAD_COORDINATES,
"convert(%d, %d) output is out of bounds",
x, y);
return;
}
weston_touch_coordinate_send_result(coordinate_resource,
wire_uint_from_double(norm.x),
wire_uint_from_double(norm.y));
wl_resource_destroy(coordinate_resource);
}
static void
destroy_touch_calibrator(struct wl_resource *resource)
{
struct weston_touch_calibrator *calibrator;
calibrator = wl_resource_get_user_data(resource);
calibrator->compositor->touch_calibrator = NULL;
weston_compositor_set_touch_mode_normal(calibrator->compositor);
if (calibrator->surface) {
unmap_calibrator(calibrator);
wl_list_remove(&calibrator->surface_destroy_listener.link);
wl_list_remove(&calibrator->surface_commit_listener.link);
}
if (calibrator->device)
wl_list_remove(&calibrator->device_destroy_listener.link);
if (calibrator->output)
wl_list_remove(&calibrator->output_destroy_listener.link);
free(calibrator);
}
static void
touch_calibrator_destroy(struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy(resource);
}
static const struct weston_touch_calibrator_interface
touch_calibrator_implementation = {
touch_calibrator_destroy,
touch_calibrator_convert
};
static void
touch_calibrator_cancel_calibration(struct weston_touch_calibrator *calibrator)
{
weston_touch_calibrator_send_cancel_calibration(calibrator->resource);
calibrator->calibration_cancelled = true;
if (calibrator->surface)
unmap_calibrator(calibrator);
}
static void
touch_calibrator_output_destroyed(struct wl_listener *listener, void *data)
{
struct weston_touch_calibrator *calibrator =
container_of(listener, struct weston_touch_calibrator,
output_destroy_listener);
assert(calibrator->output == data);
calibrator->output = NULL;
touch_calibrator_cancel_calibration(calibrator);
}
static void
touch_calibrator_device_destroyed(struct wl_listener *listener, void *data)
{
struct weston_touch_calibrator *calibrator =
container_of(listener, struct weston_touch_calibrator,
device_destroy_listener);
assert(calibrator->device == data);
calibrator->device = NULL;
touch_calibrator_cancel_calibration(calibrator);
}
static void
touch_calibrator_surface_destroyed(struct wl_listener *listener, void *data)
{
struct weston_touch_calibrator *calibrator =
container_of(listener, struct weston_touch_calibrator,
surface_destroy_listener);
assert(calibrator->surface->resource == data);
unmap_calibrator(calibrator);
calibrator->surface = NULL;
}
static void
touch_calibration_destroy(struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy(resource);
}
static struct weston_touch_device *
weston_compositor_find_touch_device_by_syspath(
struct weston_compositor *compositor,
const char *syspath)
{
struct weston_seat *seat;
struct weston_touch *touch;
struct weston_touch_device *device;
if (!syspath)
return NULL;
wl_list_for_each(seat, &compositor->seat_list, link) {
touch = weston_seat_get_touch(seat);
if (!touch)
continue;
wl_list_for_each(device, &touch->device_list, link) {
if (strcmp(device->syspath, syspath) == 0)
return device;
}
}
return NULL;
}
static void
touch_calibration_create_calibrator(
struct wl_client *client,
struct wl_resource *touch_calibration_resource,
struct wl_resource *surface_resource,
const char *syspath,
uint32_t calibrator_id)
{
struct weston_compositor *compositor;
struct weston_touch_calibrator *calibrator;
struct weston_touch_device *device;
struct weston_output *output = NULL;
struct weston_surface *surface;
uint32_t version;
int ret;
version = wl_resource_get_version(touch_calibration_resource);
compositor = wl_resource_get_user_data(touch_calibration_resource);
if (compositor->touch_calibrator != NULL) {
wl_resource_post_error(touch_calibration_resource,
WESTON_TOUCH_CALIBRATION_ERROR_ALREADY_EXISTS,
"a calibrator has already been created");
return;
}
calibrator = zalloc(sizeof *calibrator);
if (!calibrator) {
wl_client_post_no_memory(client);
return;
}
calibrator->compositor = compositor;
calibrator->resource = wl_resource_create(client,
&weston_touch_calibrator_interface,
version, calibrator_id);
if (!calibrator->resource) {
wl_client_post_no_memory(client);
goto err_dealloc;
}
surface = wl_resource_get_user_data(surface_resource);
assert(surface);
ret = weston_surface_set_role(surface, "weston_touch_calibrator",
touch_calibration_resource,
WESTON_TOUCH_CALIBRATION_ERROR_INVALID_SURFACE);
if (ret < 0)
goto err_destroy_resource;
calibrator->surface_destroy_listener.notify =
touch_calibrator_surface_destroyed;
wl_resource_add_destroy_listener(surface->resource,
&calibrator->surface_destroy_listener);
calibrator->surface = surface;
calibrator->surface_commit_listener.notify =
touch_calibrator_surface_committed;
wl_signal_add(&surface->commit_signal,
&calibrator->surface_commit_listener);
device = weston_compositor_find_touch_device_by_syspath(compositor,
syspath);
if (device) {
output = device->ops->get_output(device);
if (weston_touch_device_can_calibrate(device) && output)
calibrator->device = device;
}
if (!calibrator->device) {
wl_resource_post_error(touch_calibration_resource,
WESTON_TOUCH_CALIBRATION_ERROR_INVALID_DEVICE,
"the given touch device '%s' is not valid",
syspath ?: "");
goto err_unlink_surface;
}
calibrator->device_destroy_listener.notify =
touch_calibrator_device_destroyed;
wl_signal_add(&calibrator->device->destroy_signal,
&calibrator->device_destroy_listener);
wl_resource_set_implementation(calibrator->resource,
&touch_calibrator_implementation,
calibrator, destroy_touch_calibrator);
assert(output);
calibrator->output_destroy_listener.notify =
touch_calibrator_output_destroyed;
wl_signal_add(&output->destroy_signal,
&calibrator->output_destroy_listener);
calibrator->output = output;
weston_touch_calibrator_send_configure(calibrator->resource,
output->width,
output->height);
compositor->touch_calibrator = calibrator;
return;
err_unlink_surface:
wl_list_remove(&calibrator->surface_commit_listener.link);
wl_list_remove(&calibrator->surface_destroy_listener.link);
err_destroy_resource:
wl_resource_destroy(calibrator->resource);
err_dealloc:
free(calibrator);
}
static void
touch_calibration_save(struct wl_client *client,
struct wl_resource *touch_calibration_resource,
const char *device_name,
struct wl_array *matrix_data)
{
struct weston_touch_device *device;
struct weston_compositor *compositor;
struct weston_touch_device_matrix calibration;
struct weston_touch_calibrator *calibrator;
int i = 0;
float *c;
compositor = wl_resource_get_user_data(touch_calibration_resource);
device = weston_compositor_find_touch_device_by_syspath(compositor,
device_name);
if (!device || !weston_touch_device_can_calibrate(device)) {
wl_resource_post_error(touch_calibration_resource,
WESTON_TOUCH_CALIBRATION_ERROR_INVALID_DEVICE,
"the given device is not valid");
return;
}
wl_array_for_each(c, matrix_data) {
calibration.m[i++] = *c;
}
/* If calibration can't be saved, don't set it as current */
if (compositor->touch_calibration_save &&
compositor->touch_calibration_save(compositor, device,
&calibration) < 0)
return;
/* If calibrator is still mapped, the compositor will use
* saved_calibration when going back to normal touch handling.
* Continuing calibrating after save request is undefined. */
calibrator = compositor->touch_calibrator;
if (calibrator &&
calibrator->surface &&
weston_surface_is_mapped(calibrator->surface))
device->saved_calibration = calibration;
else
device->ops->set_calibration(device, &calibration);
}
static const struct weston_touch_calibration_interface
touch_calibration_implementation = {
touch_calibration_destroy,
touch_calibration_create_calibrator,
touch_calibration_save
};
static void
bind_touch_calibration(struct wl_client *client,
void *data, uint32_t version, uint32_t id)
{
struct weston_compositor *compositor = data;
struct wl_resource *resource;
struct weston_touch_device *device;
struct weston_seat *seat;
struct weston_touch *touch;
const char *name;
resource = wl_resource_create(client,
&weston_touch_calibration_interface,
version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource,
&touch_calibration_implementation,
compositor, NULL);
wl_list_for_each(seat, &compositor->seat_list, link) {
touch = weston_seat_get_touch(seat);
if (!touch)
continue;
wl_list_for_each(device, &touch->device_list, link) {
if (!weston_touch_device_can_calibrate(device))
continue;
name = device->ops->get_calibration_head_name(device);
if (!name)
continue;
weston_touch_calibration_send_touch_device(resource,
device->syspath, name);
}
}
}
void
weston_compositor_destroy_touch_calibrator(struct weston_compositor *ec)
{
/* TODO: handle weston_compositor::touch_calibrator destruction
* see
* https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/819#note_1345191
*/
weston_layer_fini(&ec->calibrator_layer);
}
/** Advertise touch_calibration support
*
* \param compositor The compositor to init for.
* \param save The callback function for saving a new calibration, or NULL.
* \return Zero on success, -1 on failure or if already enabled.
*
* Calling this initializes the weston_touch_calibration protocol support,
* so that the interface will be advertised to clients. It is recommended
* to use some mechanism, e.g. wl_display_set_global_filter(), to restrict
* access to the interface.
*
* There is no way to disable this once enabled.
*
* If the save callback is NULL, a new calibration provided by a client will
* always be accepted. If the save callback is not NULL, it must return
* success for the new calibration to be accepted.
*/
WL_EXPORT int
weston_compositor_enable_touch_calibrator(struct weston_compositor *compositor,
weston_touch_calibration_save_func save)
{
if (compositor->touch_calibration)
return -1;
compositor->touch_calibration = wl_global_create(compositor->wl_display,
&weston_touch_calibration_interface, 1,
compositor, bind_touch_calibration);
if (!compositor->touch_calibration)
return -1;
compositor->touch_calibration_save = save;
weston_layer_init(&compositor->calibrator_layer, compositor);
/* needs to be stacked above everything except lock screen and cursor,
* otherwise the position value is arbitrary */
weston_layer_set_position(&compositor->calibrator_layer,
WESTON_LAYER_POSITION_TOP_UI + 120);
return 0;
}