/****************************************************************************
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** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
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****************************************************************************/

#include "qiosbackingstore.h"
#include "qioswindow.h"

#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLPaintDevice>

#include <QtDebug>

QIOSBackingStore::QIOSBackingStore(QWindow *window)
    : QPlatformBackingStore(window)
    , m_context(new QOpenGLContext)
    , m_device(0)
{
    m_context->setFormat(window->requestedFormat());
    m_context->setScreen(window->screen());
    m_context->create();
}

QIOSBackingStore::~QIOSBackingStore()
{
    delete m_context;
    delete m_device;
}

void QIOSBackingStore::beginPaint(const QRegion &)
{
    // Needed to prevent QOpenGLContext::makeCurrent() from failing
    window()->setSurfaceType(QSurface::OpenGLSurface);

    m_context->makeCurrent(window());
}

QPaintDevice *QIOSBackingStore::paintDevice()
{
    if (!m_device)
        m_device = new QOpenGLPaintDevice(window()->size());

    return m_device;
}

void QIOSBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
{
    Q_UNUSED(region);
    Q_UNUSED(offset);

    m_context->swapBuffers(window);
}

void QIOSBackingStore::endPaint()
{
    // Calling makeDone() on the context here would be an option,
    // but is not needed, and would actually add some overhead.
}

void QIOSBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
    Q_UNUSED(size);
    Q_UNUSED(staticContents);

    // We don't need to resize the QOpenGLPaintDevice, as it's just a thin wrapper
    // around the OpenGL paint-engine, and the real geometry is handled by the
    // context and window.
}

QT_END_NAMESPACE