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** This file is part of the QtOpenVG module of the Qt Toolkit.

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** this package.

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****************************************************************************/

#include "qpixmapdata_vg_p.h"

#include "qpaintengine_vg_p.h"

#include <QtGui/private/qdrawhelper_p.h>

#if !defined(QT_NO_EGL)

#include <QtGui/private/qegl_p.h>

#endif

#include "qvg_p.h"

#include "qvgimagepool_p.h"

QT_BEGIN_NAMESPACE

static int qt_vg_pixmap_serial = 0;

QVGPixmapData::QVGPixmapData(PixelType type)

    : QPixmapData(type, OpenVGClass)

{

    Q_ASSERT(type == QPixmapData::PixmapType);

    vgImage = VG_INVALID_HANDLE;

    vgImageOpacity = VG_INVALID_HANDLE;

    cachedOpacity = 1.0f;

    recreate = true;

    inImagePool = false;

    inLRU = false;

#if !defined(QT_NO_EGL)

    context = 0;

    qt_vg_register_pixmap(this);

#endif

    setSerialNumber(++qt_vg_pixmap_serial);

}

QVGPixmapData::~QVGPixmapData()

{

    destroyImageAndContext();

#if !defined(QT_NO_EGL)

    qt_vg_unregister_pixmap(this);

#endif

}

void QVGPixmapData::destroyImages()

{

    if (inImagePool) {

        QVGImagePool *pool = QVGImagePool::instance();

        if (vgImage != VG_INVALID_HANDLE)

            pool->releaseImage(this, vgImage);

        if (vgImageOpacity != VG_INVALID_HANDLE)

            pool->releaseImage(this, vgImageOpacity);

    } else {

        if (vgImage != VG_INVALID_HANDLE)

            vgDestroyImage(vgImage);

        if (vgImageOpacity != VG_INVALID_HANDLE)

            vgDestroyImage(vgImageOpacity);

    }

    vgImage = VG_INVALID_HANDLE;

    vgImageOpacity = VG_INVALID_HANDLE;

    inImagePool = false;

}

void QVGPixmapData::destroyImageAndContext()

{

    if (vgImage != VG_INVALID_HANDLE) {

        // We need to have a context current to destroy the image.

#if !defined(QT_NO_EGL)

        if (context->isCurrent()) {

            destroyImages();

        } else {

            // We don't currently have a widget surface active, but we

            // need a surface to make the context current.  So use the

            // shared pbuffer surface instead.

            context->makeCurrent(qt_vg_shared_surface());

            destroyImages();

            context->lazyDoneCurrent();

        }

#else

        destroyImages();

#endif

    }

#if !defined(QT_NO_EGL)

    if (context) {

        qt_vg_destroy_context(context, QInternal::Pixmap);

        context = 0;

    }

#endif

    recreate = true;

}

QPixmapData *QVGPixmapData::createCompatiblePixmapData() const

{

    return new QVGPixmapData(pixelType());

}

bool QVGPixmapData::isValid() const

{

    return (w > 0 && h > 0);

}

void QVGPixmapData::resize(int wid, int ht)

{

    if (w == wid && h == ht)

        return;

    w = wid;

    h = ht;

    d = 32; // We always use ARGB_Premultiplied for VG pixmaps.

    is_null = (w <= 0 || h <= 0);

    source = QImage();

    recreate = true;

    setSerialNumber(++qt_vg_pixmap_serial);

}

void QVGPixmapData::fromImage

        (const QImage &image, Qt::ImageConversionFlags flags)

{

    if (image.size() == QSize(w, h))

        setSerialNumber(++qt_vg_pixmap_serial);

    else

        resize(image.width(), image.height());

    recreate = true;

}

void QVGPixmapData::fill(const QColor &color)

{

    if (!isValid())

        return;

    if (source.isNull())

        source = QImage(w, h, sourceFormat());

    if (source.depth() == 1) {

        // Pick the best approximate color in the image's colortable.

        int gray = qGray(color.rgba());

        if (qAbs(qGray(source.color(0)) - gray) < qAbs(qGray(source.color(1)) - gray))

            source.fill(0);

        else

            source.fill(1);

    } else {

        source.fill(PREMUL(color.rgba()));

    }

    // Re-upload the image to VG the next time toVGImage() is called.

    recreate = true;

}

bool QVGPixmapData::hasAlphaChannel() const

{

    if (!source.isNull())

        return source.hasAlphaChannel();

    else

        return isValid();

}

void QVGPixmapData::setAlphaChannel(const QPixmap &alphaChannel)

{

    forceToImage();

    source.setAlphaChannel(alphaChannel.toImage());

}

QImage QVGPixmapData::toImage() const

{

    if (!isValid())

        return QImage();

    if (source.isNull()) {

        source = QImage(w, h, sourceFormat());

        recreate = true;

    }

    return source;

}

QImage *QVGPixmapData::buffer()

{

    forceToImage();

    return &source;

}

QPaintEngine* QVGPixmapData::paintEngine() const

{

    // If the application wants to paint into the QPixmap, we first

    // force it to QImage format and then paint into that.

    // This is simpler than juggling multiple VG contexts.

    const_cast<QVGPixmapData *>(this)->forceToImage();

    return source.paintEngine();

}

VGImage QVGPixmapData::toVGImage()

{

    if (!isValid())

        return VG_INVALID_HANDLE;

#if !defined(QT_NO_EGL)

    // Increase the reference count on the shared context.

    if (!context)

        context = qt_vg_create_context(0, QInternal::Pixmap);

#endif

    if (recreate && prevSize != QSize(w, h))

        destroyImages();

    else if (recreate)

        cachedOpacity = -1.0f;  // Force opacity image to be refreshed later.

    if (vgImage == VG_INVALID_HANDLE) {

        vgImage = QVGImagePool::instance()->createImageForPixmap

            (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER, this);

        // Bail out if we run out of GPU memory - try again next time.

        if (vgImage == VG_INVALID_HANDLE)

            return VG_INVALID_HANDLE;

        inImagePool = true;

    } else if (inImagePool) {

        QVGImagePool::instance()->useImage(this);

    }

    if (!source.isNull() && recreate) {

        vgImageSubData

            (vgImage,

             source.constBits(), source.bytesPerLine(),

             VG_sARGB_8888_PRE, 0, 0, w, h);

    }

    recreate = false;

    prevSize = QSize(w, h);

    return vgImage;

}

VGImage QVGPixmapData::toVGImage(qreal opacity)

{

#if !defined(QT_SHIVAVG)

    // Force the primary VG image to be recreated if necessary.

    if (toVGImage() == VG_INVALID_HANDLE)

        return VG_INVALID_HANDLE;

    if (opacity == 1.0f)

        return vgImage;

    // Create an alternative image for the selected opacity.

    if (vgImageOpacity == VG_INVALID_HANDLE || cachedOpacity != opacity) {

        if (vgImageOpacity == VG_INVALID_HANDLE) {

            if (inImagePool) {

                vgImageOpacity = QVGImagePool::instance()->createImageForPixmap

                    (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER, this);

            } else {

                vgImageOpacity = vgCreateImage

                    (VG_sARGB_8888_PRE, w, h, VG_IMAGE_QUALITY_FASTER);

            }

            // Bail out if we run out of GPU memory - try again next time.

            if (vgImageOpacity == VG_INVALID_HANDLE)

                return VG_INVALID_HANDLE;

        }

        VGfloat matrix[20] = {

            1.0f, 0.0f, 0.0f, 0.0f,

            0.0f, 1.0f, 0.0f, 0.0f,

            0.0f, 0.0f, 1.0f, 0.0f,

            0.0f, 0.0f, 0.0f, opacity,

            0.0f, 0.0f, 0.0f, 0.0f

        };

        vgColorMatrix(vgImageOpacity, vgImage, matrix);

        cachedOpacity = opacity;

    }

    return vgImageOpacity;

#else

    // vgColorMatrix() doesn't work with ShivaVG, so ignore the opacity.

    Q_UNUSED(opacity);

    return toVGImage();

#endif

}

void QVGPixmapData::detachImageFromPool()

{

    if (inImagePool) {

        QVGImagePool::instance()->detachImage(this);

        inImagePool = false;

    }

}

void QVGPixmapData::hibernate()

{

    // If the image was imported (e.g, from an SgImage under Symbian),

    // then we cannot copy it back to main memory for storage.

    if (vgImage != VG_INVALID_HANDLE && source.isNull())

        return;

    forceToImage();

    destroyImageAndContext();

}

void QVGPixmapData::reclaimImages()

{

    if (!inImagePool)

        return;

    forceToImage();

    destroyImages();

}

Q_DECL_IMPORT extern int qt_defaultDpiX();

Q_DECL_IMPORT extern int qt_defaultDpiY();

int QVGPixmapData::metric(QPaintDevice::PaintDeviceMetric metric) const

{

    switch (metric) {

    case QPaintDevice::PdmWidth:

        return w;

    case QPaintDevice::PdmHeight:

        return h;

    case QPaintDevice::PdmNumColors:

        return 0;

    case QPaintDevice::PdmDepth:

        return d;

    case QPaintDevice::PdmWidthMM:

        return qRound(w * 25.4 / qt_defaultDpiX());

    case QPaintDevice::PdmHeightMM:

        return qRound(h * 25.4 / qt_defaultDpiY());

    case QPaintDevice::PdmDpiX:

    case QPaintDevice::PdmPhysicalDpiX:

        return qt_defaultDpiX();

    case QPaintDevice::PdmDpiY:

    case QPaintDevice::PdmPhysicalDpiY:

        return qt_defaultDpiY();

    default:

        qWarning("QVGPixmapData::metric(): Invalid metric");

        return 0;

    }

}

// Force the pixmap data to be in QImage format.

void QVGPixmapData::forceToImage()

{

    if (!isValid())

        return;

    if (source.isNull())

        source = QImage(w, h, sourceFormat());

    recreate = true;

}

QImage::Format QVGPixmapData::sourceFormat() const

{

    return QImage::Format_ARGB32_Premultiplied;

}

/*

    \internal

    Returns the VGImage that is storing the contents of \a pixmap.

    Returns VG_INVALID_HANDLE if \a pixmap is not owned by the OpenVG

    graphics system or \a pixmap is invalid.

    This function is typically used to access the backing store

    for a pixmap when executing raw OpenVG calls.  It must only

    be used when a QPainter is active and the OpenVG paint engine

    is in use by the QPainter.

    \sa {QtOpenVG Module}

*/

Q_OPENVG_EXPORT VGImage qPixmapToVGImage(const QPixmap& pixmap)

{

    QPixmapData *pd = pixmap.pixmapData();

    if (!pd)

        return VG_INVALID_HANDLE; // null QPixmap

    if (pd->classId() == QPixmapData::OpenVGClass) {

        QVGPixmapData *vgpd = static_cast<QVGPixmapData *>(pd);

        if (vgpd->isValid())

            return vgpd->toVGImage();

    }

    return VG_INVALID_HANDLE;

}

QT_END_NAMESPACE