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#include "qshapedpixmapdndwindow_p.h"

#include <QtGui/QPainter>
#include <QtGui/QCursor>
#include <QtGui/QGuiApplication>
#include <QtGui/QPalette>
#include <QtGui/QBitmap>

QT_BEGIN_NAMESPACE

QShapedPixmapWindow::QShapedPixmapWindow(QScreen *screen)
    : QWindow(screen),
      m_backingStore(0),
      m_useCompositing(true)
{
    QSurfaceFormat format;
    format.setAlphaBufferSize(8);
    setFormat(format);
    setSurfaceType(RasterSurface);
    setFlags(Qt::ToolTip | Qt::FramelessWindowHint |
                   Qt::X11BypassWindowManagerHint | Qt::WindowTransparentForInput | Qt::WindowDoesNotAcceptFocus);
    create();
    m_backingStore = new QBackingStore(this);
}

QShapedPixmapWindow::~QShapedPixmapWindow()
{
    delete m_backingStore;
    m_backingStore = 0;
}

void QShapedPixmapWindow::render()
{
    QRect rect(QPoint(), geometry().size());

    m_backingStore->beginPaint(rect);

    QPaintDevice *device = m_backingStore->paintDevice();

    {
        QPainter p(device);
        if (m_useCompositing)
            p.setCompositionMode(QPainter::CompositionMode_Source);
        else
            p.fillRect(rect, QGuiApplication::palette().base());
        p.drawPixmap(0, 0, m_pixmap);
    }

    m_backingStore->endPaint();
    m_backingStore->flush(rect);
}

void QShapedPixmapWindow::setPixmap(const QPixmap &pixmap)
{
    m_pixmap = pixmap;
    if (!m_useCompositing)
        setMask(m_pixmap.mask());
}

void QShapedPixmapWindow::setHotspot(const QPoint &hotspot)
{
    m_hotSpot = hotspot;
}

void QShapedPixmapWindow::updateGeometry(const QPoint &pos)
{
    if (m_pixmap.isNull())
        m_backingStore->resize(QSize(1,1));
    else if (m_backingStore->size() != m_pixmap.size())
        m_backingStore->resize(m_pixmap.size());

    setGeometry(QRect(pos - m_hotSpot, m_backingStore->size()));
}

void QShapedPixmapWindow::exposeEvent(QExposeEvent *)
{
    render();
}

QT_END_NAMESPACE