/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2014 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 "surface.h"

#include <QRegion>
#include <QVector>

namespace KWin
{
namespace Wayland
{

QList<Surface*> Surface::s_surfaces = QList<Surface*>();

Surface::Surface(QObject *parent)
    : QObject(parent)
    , m_surface(nullptr)
    , m_frameCallbackInstalled(false)
{
    s_surfaces << this;
}

Surface::~Surface()
{
    s_surfaces.removeAll(this);
    release();
}

void Surface::release()
{
    if (!m_surface) {
        return;
    }
    wl_surface_destroy(m_surface);
    m_surface = nullptr;
}

void Surface::destroy()
{
    if (!m_surface) {
        return;
    }
    free(m_surface);
    m_surface = nullptr;
}

void Surface::setup(wl_surface *surface)
{
    Q_ASSERT(surface);
    Q_ASSERT(!m_surface);
    m_surface = surface;
}

void Surface::frameCallback(void *data, wl_callback *callback, uint32_t time)
{
    Q_UNUSED(time)
    Surface *s = reinterpret_cast<Surface*>(data);
    if (callback) {
        wl_callback_destroy(callback);
    }
    s->handleFrameCallback();
}

void Surface::handleFrameCallback()
{
    m_frameCallbackInstalled = false;
    frameRendered();
}

const struct wl_callback_listener Surface::s_listener = {
        Surface::frameCallback
};

void Surface::setupFrameCallback()
{
    Q_ASSERT(isValid());
    Q_ASSERT(!m_frameCallbackInstalled);
    wl_callback *callback = wl_surface_frame(m_surface);
    wl_callback_add_listener(callback, &s_listener, this);
    m_frameCallbackInstalled = true;
}

void Surface::commit(Surface::CommitFlag flag)
{
    Q_ASSERT(isValid());
    if (flag == CommitFlag::FrameCallback) {
        setupFrameCallback();
    }
    wl_surface_commit(m_surface);
}

void Surface::damage(const QRegion &region)
{
    for (const QRect &r : region.rects()) {
        damage(r);
    }
}

void Surface::damage(const QRect &rect)
{
    Q_ASSERT(isValid());
    wl_surface_damage(m_surface, rect.x(), rect.y(), rect.width(), rect.height());
}

void Surface::attachBuffer(wl_buffer *buffer, const QPoint &offset)
{
    Q_ASSERT(isValid());
    wl_surface_attach(m_surface, buffer, offset.x(), offset.y());
}

void Surface::setSize(const QSize &size)
{
    if (m_size == size) {
        return;
    }
    m_size = size;
    emit sizeChanged(m_size);
}

Surface *Surface::get(wl_surface *native)
{
    auto it = std::find_if(s_surfaces.constBegin(), s_surfaces.constEnd(),
        [native](Surface *s) {
            return s->m_surface == native;
        }
    );
    if (it != s_surfaces.constEnd()) {
        return *(it);
    }
    return nullptr;
}

const QList< Surface* > &Surface::all()
{
    return s_surfaces;
}

}
}