#include "rendererwindow.hpp"

RendererWindow::RendererWindow(QRect &size, QWindow *parent) :
    QWindow(*parent)
{
    create();
    backingStore = new QBackingStore(this);
    setGeometry(size);
}

bool RasterWindow::event(QEvent *event)
{
    if (event->type() == QEvent::UpdateRequest) {
        renderNow();
        return true;
    }
    return QWindow::event(event);
}

void RendererWindow::renderLater() {
    requestUpdate();
}

void RasterWindow::resizeEvent(QResizeEvent *resizeEvent)
{
    m_backingStore->resize(resizeEvent->size());
    if (isExposed())
        renderNow();
}

void RasterWindow::exposeEvent(QExposeEvent *)
{
    if (isExposed())
        renderNow();
}

void RasterWindow::renderNow()
{
    if (!isExposed())
        return;

    QRect rect(0, 0, width(), height());
    m_backingStore->beginPaint(rect);

    QPaintDevice *device = m_backingStore->paintDevice();
    QPainter painter(device);

    painter.fillRect(0, 0, width(), height(), Qt::white);
    render(&painter);

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