Mir
server_example_custom_compositor.cpp

Demonstrate writing an alternative GL rendering code

/*
* Copyright © 2015, 2016 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: Kevin DuBois <kevin.dubois@canonical.com>
*/
#include "mir/server.h"
namespace me = mir::examples;
namespace mg = mir::graphics;
namespace mc = mir::compositor;
namespace
{
char const* const compositor_option = "custom-compositor";
char const* const compositor_description = "Select an alterative compositor [{adorning|default}]";
char const* const compositor_adorning = "adorning";
char const* const compositor_default = "default";
char const* const background_option = "background-color";
char const* const background_description =
"fill the background of the adorning compositor with a color [{purple|blue|grey|black}]";
char const* const background_purple = "purple";
char const* const background_blue = "blue";
char const* const background_grey = "grey";
char const* const background_black = "black";
class AdorningDisplayBufferCompositorFactory : public mc::DisplayBufferCompositorFactory
{
public:
AdorningDisplayBufferCompositorFactory(std::tuple<float, float, float> const& rgb_color,
std::shared_ptr<mc::CompositorReport> const& report) :
color(rgb_color), report(report)
{
}
std::unique_ptr<mc::DisplayBufferCompositor> create_compositor_for(
mg::DisplayBuffer& display_buffer) override
{
return std::make_unique<me::AdorningDisplayBufferCompositor>(display_buffer, color, report);
}
private:
std::tuple<float, float, float> const color;
std::shared_ptr<mc::CompositorReport> const report;
};
}
{
server.add_configuration_option(compositor_option, compositor_description, compositor_default);
server.add_configuration_option(background_option, background_description, background_black);
server.wrap_display_buffer_compositor_factory(
[server](std::shared_ptr<mc::DisplayBufferCompositorFactory> const& factory)
-> std::shared_ptr<mc::DisplayBufferCompositorFactory>
{
auto const selection = server.get_options()->get<std::string>(compositor_option);
auto const color_name = server.get_options()->get<std::string>(background_option);
if (selection == compositor_adorning)
{
std::tuple<float, float, float> color;
if (color_name == background_blue)
color = std::make_tuple(0.4, 0.5, 1.0);
else if (color_name == background_grey)
color = std::make_tuple(0.3, 0.3, 0.3);
else if (color_name == background_purple)
color = std::make_tuple(0.8, 0.5, 0.8);
else if (color_name == background_black)
color = std::make_tuple(0.0, 0.0, 0.0);
else
throw mir::AbnormalExit("Unknown color selection: " + color_name);
return std::make_shared<AdorningDisplayBufferCompositorFactory>(color, server.the_compositor_report());
}
else if (selection == compositor_default)
{
if (color_name != background_black)
throw mir::AbnormalExit("default compositor can only set background color to black");
return factory;
}
throw mir::AbnormalExit("Unknown compositor selection: " + selection);
});
}

Copyright © 2012-2015 Canonical Ltd.
Generated on Wed Mar 30 00:29:56 UTC 2016