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#include "pvreglwindowsurface.h"

#include "pvreglscreen.h"

#include <QScreen>

#include <QDebug>

#include <QWSDisplay>

PvrEglWindowSurface::PvrEglWindowSurface

        (QWidget *widget, PvrEglScreen *screen, int screenNum)

    : QWSGLWindowSurface(widget)

{

    setSurfaceFlags(QWSWindowSurface::Opaque);

    this->widget = widget;

    this->screen = screen;

    this->pdevice = 0;

    QPoint pos = offset(widget);

    QSize size = widget->size();

    PvrQwsRect pvrRect;

    pvrRect.x = pos.x();

    pvrRect.y = pos.y();

    pvrRect.width = size.width();

    pvrRect.height = size.height();

    transformRects(&pvrRect, 1);

    // Try to recover a previous PvrQwsDrawable object for the widget

    // if there is one.  This can happen when a PvrEglWindowSurface

    // is created for a widget, bound to a EGLSurface, and then destroyed.

    // When a new PvrEglWindowSurface is created for the widget, it will

    // pick up the previous PvrQwsDrawable if the EGLSurface has not been

    // destroyed in the meantime.

    drawable = pvrQwsFetchWindow((long)widget);

    if (drawable)

        pvrQwsSetGeometry(drawable, &pvrRect);

    else

        drawable = pvrQwsCreateWindow(screenNum, (long)widget, &pvrRect);

    pvrQwsSetRotation(drawable, screen->transformation());

}

PvrEglWindowSurface::PvrEglWindowSurface()

    : QWSGLWindowSurface()

{

    setSurfaceFlags(QWSWindowSurface::Opaque);

    drawable = 0;

    widget = 0;

    screen = 0;

    pdevice = 0;

}

PvrEglWindowSurface::~PvrEglWindowSurface()

{

    // Release the PvrQwsDrawable.  If it is bound to an EGLSurface,

    // then it will stay around until a new PvrEglWindowSurface is

    // created for the widget.  If it is not bound to an EGLSurface,

    // it will be destroyed immediately.

    if (drawable && pvrQwsReleaseWindow(drawable))

        pvrQwsDestroyDrawable(drawable);

    delete pdevice;

}

bool PvrEglWindowSurface::isValid() const

{

    return (widget != 0);

}

void PvrEglWindowSurface::setGeometry(const QRect &rect)

{

    if (drawable) {

        // XXX: adjust for the screen offset.

        PvrQwsRect pvrRect;

        pvrRect.x = rect.x();

        pvrRect.y = rect.y();

        pvrRect.width = rect.width();

        pvrRect.height = rect.height();

        transformRects(&pvrRect, 1);

        pvrQwsSetGeometry(drawable, &pvrRect);

        pvrQwsSetRotation(drawable, screen->transformation());

    }

    QWSGLWindowSurface::setGeometry(rect);

}

bool PvrEglWindowSurface::move(const QPoint &offset)

{

    QRect rect = geometry().translated(offset); 

    if (drawable) {

        PvrQwsRect pvrRect;

        pvrRect.x = rect.x();

        pvrRect.y = rect.y();

        pvrRect.width = rect.width();

        pvrRect.height = rect.height();

        transformRects(&pvrRect, 1);

        pvrQwsSetGeometry(drawable, &pvrRect);

        pvrQwsSetRotation(drawable, screen->transformation());

    }

    return QWSGLWindowSurface::move(offset);

}

QByteArray PvrEglWindowSurface::permanentState() const

{

    // Nothing interesting to pass to the server just yet.

    return QByteArray();

}

void PvrEglWindowSurface::setPermanentState(const QByteArray &state)

{

    Q_UNUSED(state);

}

void PvrEglWindowSurface::flush

        (QWidget *widget, const QRegion &region, const QPoint &offset)

{

    // The GL paint engine is responsible for the swapBuffers() call.

    // If we were to call the base class's implementation of flush()

    // then it would fetch the image() and manually blit it to the

    // screeen instead of using the fast PVR2D blit.

    Q_UNUSED(widget);

    Q_UNUSED(region);

    Q_UNUSED(offset);

}

QImage PvrEglWindowSurface::image() const

{

    if (drawable) {

        PvrQwsRect pvrRect;

        pvrQwsGetGeometry(drawable, &pvrRect);

        void *data = pvrQwsGetRenderBuffer(drawable);

        if (data) {

            return QImage((uchar *)data, pvrRect.width, pvrRect.height,

                          pvrQwsGetStride(drawable), screen->pixelFormat());

        }

    }

    return QImage(16, 16, screen->pixelFormat());

}

QPaintDevice *PvrEglWindowSurface::paintDevice()

{

    return widget;

}

void PvrEglWindowSurface::setDirectRegion(const QRegion &r, int id)

{

    QWSGLWindowSurface::setDirectRegion(r, id);

    if (!drawable)

        return;

    // Clip the region to the window boundaries in case the child

    // is partially outside the geometry of the parent.

    QWidget *window = widget->window();

    QRegion region = r;

    if (widget != window) {

	QRect rect = window->geometry();

        rect.moveTo(window->mapToGlobal(QPoint(0, 0)));

        region = region.intersect(rect);

    }

    if (region.isEmpty()) {

        pvrQwsClearVisibleRegion(drawable);

    } else if (region.numRects() == 1) {

        QRect rect = region.boundingRect();

        PvrQwsRect pvrRect;

        pvrRect.x = rect.x();

        pvrRect.y = rect.y();

        pvrRect.width = rect.width();

        pvrRect.height = rect.height();

        transformRects(&pvrRect, 1);

        pvrQwsSetVisibleRegion(drawable, &pvrRect, 1);

        pvrQwsSetRotation(drawable, screen->transformation());

        if (!pvrQwsSwapBuffers(drawable, 1))

            screen->solidFill(QColor(0, 0, 0), region);

    } else {

        QVector<QRect> rects = region.rects();

        PvrQwsRect *pvrRects = new PvrQwsRect [rects.size()];

        for (int index = 0; index < rects.size(); ++index) {

            QRect rect = rects[index];

            pvrRects[index].x = rect.x();

            pvrRects[index].y = rect.y();

            pvrRects[index].width = rect.width();

            pvrRects[index].height = rect.height();

        }

        transformRects(pvrRects, rects.size());

        pvrQwsSetVisibleRegion(drawable, pvrRects, rects.size());

        pvrQwsSetRotation(drawable, screen->transformation());

        if (!pvrQwsSwapBuffers(drawable, 1))

            screen->solidFill(QColor(0, 0, 0), region);

        delete [] pvrRects;

    }

}

void PvrEglWindowSurface::transformRects(PvrQwsRect *rects, int count) const

{

    switch (screen->transformation()) {

    case 0: break;

    case 90:

    {

        for (int index = 0; index < count; ++index) {

            int x = rects[index].y;

            int y = screen->height() - (rects[index].x + rects[index].width);

            rects[index].x = x;

            rects[index].y = y;

            qSwap(rects[index].width, rects[index].height);

        }

    }

    break;

    case 180:

    {

        for (int index = 0; index < count; ++index) {

            int x = screen->width() - (rects[index].x + rects[index].width);

            int y = screen->height() - (rects[index].y + rects[index].height);

            rects[index].x = x;

            rects[index].y = y;

        }

    }

    break;

    case 270:

    {

        for (int index = 0; index < count; ++index) {

            int x = screen->width() - (rects[index].y + rects[index].height);

            int y = rects[index].x;

            rects[index].x = x;

            rects[index].y = y;

            qSwap(rects[index].width, rects[index].height);

        }

    }

    break;

    }

}