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

Copyright (C) 2013 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 "buffer.h"
#include "shm_pool.h"
// system
#include <string.h>

namespace KWin
{
namespace Wayland
{

const struct wl_buffer_listener Buffer::s_listener = {
    Buffer::releasedCallback
};

Buffer::Buffer(ShmPool *parent, wl_buffer *buffer, const QSize &size, int32_t stride, size_t offset)
    : m_shm(parent)
    , m_nativeBuffer(buffer)
    , m_released(false)
    , m_size(size)
    , m_stride(stride)
    , m_offset(offset)
    , m_used(false)
{
    wl_buffer_add_listener(m_nativeBuffer, &s_listener, this);
}

Buffer::~Buffer()
{
    wl_buffer_destroy(m_nativeBuffer);
}

void Buffer::releasedCallback(void *data, wl_buffer *buffer)
{
    Buffer *b = reinterpret_cast<Buffer*>(data);
    Q_ASSERT(b->m_nativeBuffer == buffer);
    b->setReleased(true);
}

void Buffer::copy(const void *src)
{
    memcpy(address(), src, m_size.height()*m_stride);
}

uchar *Buffer::address()
{
    return reinterpret_cast<uchar*>(m_shm->poolAddress()) + m_offset;
}

}
}