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/*
* Copyright © 2014 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/>.
*
* Authored By: Alan Griffiths <alan@octopull.co.uk>
*/
#include "server_example_display_configuration_policy.h"
#include "mir/graphics/default_display_configuration_policy.h"
#include "mir/graphics/display_configuration.h"
#include "mir/server.h"
#include "mir/options/option.h"
#include <algorithm>
#include <unordered_map>
#include <stdexcept>
namespace geom = mir::geometry;
namespace me = mir::examples;
namespace mg = mir::graphics;
///\example server_example_display_configuration_policy.cpp
/// Demonstrate custom display configuration policies for "sidebyside" and "single"
char const* const me::display_config_opt = "display-config";
char const* const me::display_config_descr = "Display configuration [{clone,sidebyside,single}]";
char const* const me::clone_opt_val = "clone";
char const* const me::sidebyside_opt_val = "sidebyside";
char const* const me::single_opt_val = "single";
char const* const me::display_alpha_opt = "translucent";
char const* const me::display_alpha_descr = "Select a display mode with alpha[{on,off}]";
char const* const me::display_alpha_off = "off";
char const* const me::display_alpha_on = "on";
namespace
{
bool contains_alpha(MirPixelFormat format)
{
return (format == mir_pixel_format_abgr_8888 ||
format == mir_pixel_format_argb_8888);
}
}
me::PixelFormatSelector::PixelFormatSelector(std::shared_ptr<DisplayConfigurationPolicy> const& base_policy,
bool with_alpha)
: base_policy{base_policy},
with_alpha{with_alpha}
{}
void me::PixelFormatSelector::apply_to(graphics::DisplayConfiguration & conf)
{
base_policy->apply_to(conf);
conf.for_each_output(
[&](graphics::UserDisplayConfigurationOutput& conf_output)
{
if (!conf_output.connected || !conf_output.used) return;
auto const& pos = find_if(conf_output.pixel_formats.begin(),
conf_output.pixel_formats.end(),
[&](MirPixelFormat format) -> bool
{
return contains_alpha(format) == with_alpha;
}
);
// keep the default settings if nothing was found
if (pos == conf_output.pixel_formats.end())
return;
conf_output.current_format = *pos;
});
}
void me::add_display_configuration_options_to(mir::Server& server)
{
// Add choice of monitor configuration
server.add_configuration_option(
me::display_config_opt, me::display_config_descr, me::clone_opt_val);
server.add_configuration_option(
me::display_alpha_opt, me::display_alpha_descr, me::display_alpha_off);
server.wrap_display_configuration_policy(
[&](std::shared_ptr<mg::DisplayConfigurationPolicy> const& wrapped)
-> std::shared_ptr<mg::DisplayConfigurationPolicy>
{
auto const options = server.get_options();
auto display_layout = options->get<std::string>(me::display_config_opt);
auto with_alpha = options->get<std::string>(me::display_alpha_opt) == me::display_alpha_on;
auto layout_selector = wrapped;
if (display_layout == me::sidebyside_opt_val)
layout_selector = std::make_shared<mg::SideBySideDisplayConfigurationPolicy>();
else if (display_layout == me::single_opt_val)
layout_selector = std::make_shared<mg::SingleDisplayConfigurationPolicy>();
// Whatever the layout select a pixel format with requested alpha
return std::make_shared<me::PixelFormatSelector>(layout_selector, with_alpha);
});
}
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