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/*
* Client which validates incoming touch events.
*
* Copyright © 2015 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Robert Carr <robert.carr@canonical.com>
*/
#include "eglapp.h"
#include <mir_toolkit/mir_client_library.h>
#include <GLES2/gl2.h>
#include <set>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
namespace
{
// Assumes all touch input comes from a single device.
// Validates:
// 1. All touches which were down stay down unless they were coming up
// 2. All touches which were released do not appear
// 3. Only one touch comes up or down at a time.
bool validate_events(MirTouchEvent const* last_event, MirTouchEvent const* event)
{
std::set<MirTouchId> must_be_present;
std::set<MirTouchId> may_not_be_present;
// Here, from the last event, we build a list of points which must be
// and which must not be present in the next event.
for (size_t i = 0; i < mir_touch_event_point_count(last_event); i++)
{
auto id = mir_touch_event_id(last_event, i);
auto action = mir_touch_event_action(last_event, i);
if (action == mir_touch_action_change)
must_be_present.insert(id);
else if (action == mir_touch_action_down)
must_be_present.insert(id);
else
may_not_be_present.insert(id);
}
if (may_not_be_present.size() > 1)
{
printf("More than one touch came up\n");
return false;
}
bool found_a_up_down = false;
for (size_t i = 0; i < mir_touch_event_point_count(event); i++)
{
auto id = mir_touch_event_id(event, i);
auto it = may_not_be_present.find(id);
// Here we validate condition 2, where released touches may not reappear
if (it != may_not_be_present.end())
{
printf("We repeated a touch which was already lifted (%d)\n", static_cast<int>(id));
return false;
}
it = must_be_present.find(id);
if (it != must_be_present.end())
{
must_be_present.erase(it);
}
// Here we validate condition 4
else if (mir_touch_event_action(event, i) == mir_touch_action_down)
{
if (found_a_up_down)
printf("Found too many downs in one event\n");
found_a_up_down = true;
}
if (mir_touch_event_action(event, i) == mir_touch_action_up)
{
if (found_a_up_down)
printf("Found too many ups in one event\n");
found_a_up_down = true;
}
}
// Here we validate condition 1
if (must_be_present.size())
{
printf("We received a touch which did not contain all required IDs\n");
return false;
}
return true;
}
class TouchState
{
public:
TouchState() : last_event(nullptr) {}
~TouchState() { if (last_event) mir_event_unref(last_event); }
void record_event(MirTouchEvent const* event)
{
if (!last_event)
{
last_event = mir_event_ref(reinterpret_cast<MirEvent const*>(event));
return;
}
if (!validate_events(reinterpret_cast<MirTouchEvent const*>(last_event), event))
abort();
mir_event_unref(last_event);
last_event = mir_event_ref(reinterpret_cast<MirEvent const*>(event));
}
private:
MirEvent const* last_event;
};
void on_input_event(TouchState *state, MirInputEvent const *event)
{
if (mir_input_event_get_type(event) != mir_input_event_type_touch)
return;
auto tev = mir_input_event_get_touch_event(event);
state->record_event(tev);
}
void on_event(MirSurface * /*surface*/, const MirEvent *event, void *context)
{
TouchState *state = (TouchState*)context;
switch (mir_event_get_type(event))
{
case mir_event_type_input:
on_input_event(state, mir_event_get_input_event(event));
break;
case mir_event_type_close_surface:
abort();
break;
default:
break;
}
}
}
typedef struct Color
{
GLfloat r, g, b, a;
} Color;
int main(int argc, char *argv[])
{
unsigned int width = 0, height = 0;
if (!mir_eglapp_init(argc, argv, &width, &height))
return 1;
TouchState state;
MirSurface *surface = mir_eglapp_native_surface();
mir_surface_set_event_handler(surface, on_event, &state);
float const opacity = mir_eglapp_background_opacity;
Color red = {opacity, 0.0f, 0.0f, opacity};
Color green = {0.0f, opacity, 0.0f, opacity};
Color blue = {0.0f, 0.0f, opacity, opacity};
/* This is probably the simplest GL you can do */
while (mir_eglapp_running())
{
glClearColor(red.r, red.g, red.b, red.a);
glClear(GL_COLOR_BUFFER_BIT);
mir_eglapp_swap_buffers();
sleep(1);
glClearColor(green.r, green.g, green.b, green.a);
glClear(GL_COLOR_BUFFER_BIT);
mir_eglapp_swap_buffers();
sleep(1);
glClearColor(blue.r, blue.g, blue.b, blue.a);
glClear(GL_COLOR_BUFFER_BIT);
mir_eglapp_swap_buffers();
sleep(1);
}
mir_eglapp_shutdown();
return 0;
}
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