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/*
* Copyright © 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 2 or 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/>.
*/
#include "mir/test/doubles/fake_display.h"
#include "mir/test/doubles/stub_display_configuration.h"
#include "mir/graphics/event_handler_register.h"
#include <system_error>
#include <boost/throw_exception.hpp>
#include <sys/eventfd.h>
namespace mtd = mir::test::doubles;
namespace mg = mir::graphics;
namespace
{
bool compatible(mtd::StubDisplayConfig const& conf1, mtd::StubDisplayConfig const& conf2)
{
auto compatible =
conf1.cards == conf2.cards &&
conf1.outputs.size() == conf2.outputs.size() &&
std::equal(begin(conf1.outputs), end(conf1.outputs),
begin(conf2.outputs),
[] (mg::DisplayConfigurationOutput const& output1, mg::DisplayConfigurationOutput const& output2)
{
// ignore difference in orientation, scale factor, form factor, subpixel arrangement
auto clone = output2;
clone.orientation = output1.orientation;
clone.subpixel_arrangement = output1.subpixel_arrangement;
clone.scale = output1.scale;
clone.form_factor = output1.form_factor;
return clone == output1;
});
return compatible;
}
}
mtd::FakeDisplay::FakeDisplay()
: config{std::make_shared<StubDisplayConfig>()},
wakeup_trigger{::eventfd(0, EFD_CLOEXEC)},
handler_called{false}
{
if (wakeup_trigger == Fd::invalid)
{
BOOST_THROW_EXCEPTION(std::system_error(errno, std::system_category(), "Failed to create wakeup FD"));
}
}
mtd::FakeDisplay::FakeDisplay(std::vector<geometry::Rectangle> const& output_rects) :
config{std::make_shared<StubDisplayConfig>(output_rects)},
wakeup_trigger{::eventfd(0, EFD_CLOEXEC)},
handler_called{false}
{
if (wakeup_trigger == Fd::invalid)
{
BOOST_THROW_EXCEPTION(std::system_error(errno, std::system_category(), "Failed to create wakeup FD"));
}
for (auto const& rect : output_rects)
groups.emplace_back(new StubDisplaySyncGroup({rect}));
}
void mtd::FakeDisplay::for_each_display_sync_group(std::function<void(mir::graphics::DisplaySyncGroup&)> const& f)
{
std::lock_guard lock{configuration_mutex};
for (auto& group : groups)
f(*group);
}
std::unique_ptr<mir::graphics::DisplayConfiguration> mtd::FakeDisplay::configuration() const
{
std::lock_guard lock{configuration_mutex};
return std::unique_ptr<mir::graphics::DisplayConfiguration>(new StubDisplayConfig(*config));
}
void mtd::FakeDisplay::register_configuration_change_handler(
mir::graphics::EventHandlerRegister& handlers,
mir::graphics::DisplayConfigurationChangeHandler const& handler)
{
handlers.register_fd_handler(
{wakeup_trigger},
this,
[this, handler](int fd)
{
eventfd_t value;
if (eventfd_read(fd, &value) == -1)
{
BOOST_THROW_EXCEPTION(std::system_error(errno, std::system_category(), "Failed to read from wakeup FD"));
}
if (value > 0)
{
handler();
handler_called = true;
}
});
}
bool mtd::FakeDisplay::apply_if_configuration_preserves_display_buffers(graphics::DisplayConfiguration const& new_config)
{
auto new_configuration = std::make_shared<StubDisplayConfig>(new_config);
std::lock_guard lock{configuration_mutex};
if (compatible(*config, *new_configuration))
{
std::swap(config, new_configuration);
return true;
}
return false;
}
void mtd::FakeDisplay::configure(mir::graphics::DisplayConfiguration const& new_config)
{
std::lock_guard lock{configuration_mutex};
decltype(config) new_configuration = std::make_shared<StubDisplayConfig>(new_config);
decltype(groups) new_groups;
new_configuration->for_each_output([&](mir::graphics::DisplayConfigurationOutput const& output)
{
new_groups.emplace_back(new StubDisplaySyncGroup({output.extents()}));
});
swap(config, new_configuration);
swap(groups, new_groups);
}
void mtd::FakeDisplay::emit_configuration_change_event(
std::shared_ptr<mir::graphics::DisplayConfiguration> const& new_config)
{
handler_called = false;
std::lock_guard lock{configuration_mutex};
config = std::make_shared<StubDisplayConfig>(*new_config);
if (eventfd_write(wakeup_trigger, 1) == -1)
{
BOOST_THROW_EXCEPTION(std::system_error(errno, std::system_category(), "Failed to write to wakeup FD"));
}
}
void mtd::FakeDisplay::wait_for_configuration_change_handler()
{
while (!handler_called)
std::this_thread::sleep_for(std::chrono::milliseconds{1});
}
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