source: trunk/src/openvg/qvgimagepool.cpp@ 674

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#include "qvgimagepool_p.h"
#include "qpixmapdata_vg_p.h"

QT_BEGIN_NAMESPACE

static QVGImagePool *qt_vg_image_pool = 0;

class QVGImagePoolPrivate
{
public:
    QVGImagePoolPrivate() : lruFirst(0), lruLast(0) {}

    QVGPixmapData *lruFirst;
    QVGPixmapData *lruLast;
};

QVGImagePool::QVGImagePool()
    : d_ptr(new QVGImagePoolPrivate())
{
}

QVGImagePool::~QVGImagePool()
{
}

QVGImagePool *QVGImagePool::instance()
{
    if (!qt_vg_image_pool)
        qt_vg_image_pool = new QVGImagePool();
    return qt_vg_image_pool;
}

void QVGImagePool::setImagePool(QVGImagePool *pool)
{
    if (qt_vg_image_pool != pool)
        delete qt_vg_image_pool;
    qt_vg_image_pool = pool;
}

VGImage QVGImagePool::createTemporaryImage(VGImageFormat format,
                                           VGint width, VGint height,
                                           VGbitfield allowedQuality,
                                           QVGPixmapData *keepData)
{
    VGImage image;
    do {
        image = vgCreateImage(format, width, height, allowedQuality);
        if (image != VG_INVALID_HANDLE)
            return image;
    } while (reclaimSpace(format, width, height, keepData));
    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d temporary image",
             width, height);
    return VG_INVALID_HANDLE;
}

VGImage QVGImagePool::createImageForPixmap(VGImageFormat format,
                                           VGint width, VGint height,
                                           VGbitfield allowedQuality,
                                           QVGPixmapData *data)
{
    VGImage image;
    do {
        image = vgCreateImage(format, width, height, allowedQuality);
        if (image != VG_INVALID_HANDLE) {
            if (data)
                moveToHeadOfLRU(data);
            return image;
        }
    } while (reclaimSpace(format, width, height, data));
    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d pixmap",
             width, height);
    return VG_INVALID_HANDLE;
}

VGImage QVGImagePool::createPermanentImage(VGImageFormat format,
                                           VGint width, VGint height,
                                           VGbitfield allowedQuality)
{
    VGImage image;
    do {
        image = vgCreateImage(format, width, height, allowedQuality);
        if (image != VG_INVALID_HANDLE)
            return image;
    } while (reclaimSpace(format, width, height, 0));
    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d image",
             width, height);
    return VG_INVALID_HANDLE;
}

void QVGImagePool::releaseImage(QVGPixmapData *data, VGImage image)
{
    // Very simple strategy at the moment: just destroy the image.
    if (data)
        removeFromLRU(data);
    vgDestroyImage(image);
}

void QVGImagePool::useImage(QVGPixmapData *data)
{