kwin/wayland_cursor_theme.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 "wayland_cursor_theme.h"
#include "cursor.h"
#include "wayland_server.h"
// Qt
#include <QVector>
// KWayland
#include <KWayland/Client/shm_pool.h>
#include <KWayland/Server/display.h>
#include <KWayland/Server/output_interface.h>
// Wayland
#include <wayland-cursor.h>
namespace KWin
{
WaylandCursorTheme::WaylandCursorTheme(KWayland::Client::ShmPool *shm, QObject *parent)
: QObject(parent)
, m_theme(nullptr)
, m_shm(shm)
{
}
WaylandCursorTheme::~WaylandCursorTheme()
{
destroyTheme();
}
void WaylandCursorTheme::loadTheme()
{
if (!m_shm->isValid()) {
return;
}
Cursor *c = Cursor::self();
if (!m_theme) {
// so far the theme had not been created, this means we need to start tracking theme changes
connect(c, &Cursor::themeChanged, this, &WaylandCursorTheme::loadTheme);
} else {
destroyTheme();
}
int size = c->themeSize();
if (size == 0) {
// resolution depended
// as we don't support per screen cursor sizes yet, we use the first screen
KWayland::Server::Display *display = waylandServer()->display();
auto output = display->outputs().first();
// calculate dots per inch, multiplied with magic constants from Cursor::loadThemeSettings()
size = qreal(output->pixelSize().height()) / (qreal(output->physicalSize().height()) * 0.0393701) * 16.0 / 72.0;
}
m_theme = wl_cursor_theme_load(c->themeName().toUtf8().constData(),
size, m_shm->shm());
emit themeChanged();
}
void WaylandCursorTheme::destroyTheme()
{
if (!m_theme) {
return;
}
wl_cursor_theme_destroy(m_theme);
m_theme = nullptr;
}
wl_cursor_image *WaylandCursorTheme::get(Qt::CursorShape shape)
{
if (!m_theme) {
loadTheme();
}
if (!m_theme) {
// loading cursor failed
return nullptr;
}
const QByteArray name = Cursor::self()->cursorName(shape);
wl_cursor *c = wl_cursor_theme_get_cursor(m_theme, name.constData());
if (!c || c->image_count <= 0) {
const auto &names = Cursor::self()->cursorAlternativeNames(name);
for (auto it = names.begin(), end = names.end(); it != end; it++) {
c = wl_cursor_theme_get_cursor(m_theme, (*it).constData());
if (c && c->image_count > 0) {
break;
}
}
}
if (!c || c->image_count <= 0) {
return nullptr;
}
// TODO: who deletes c?
return c->images[0];
}
}