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    41 

    42 #include "qvgimagepool_p.h"

    43 #include "qpixmapdata_vg_p.h"

    44 

    45 QT_BEGIN_NAMESPACE

    46 

    47 static QVGImagePool *qt_vg_image_pool = 0;

    48 

    49 class QVGImagePoolPrivate

    50 {

    51 public:

    52     QVGImagePoolPrivate() : lruFirst(0), lruLast(0) {}

    53 

    54     QVGPixmapData *lruFirst;

    55     QVGPixmapData *lruLast;

    56 };

    57 

    58 QVGImagePool::QVGImagePool()

    59     : d_ptr(new QVGImagePoolPrivate())

    60 {

    61 }

    62 

    63 QVGImagePool::~QVGImagePool()

    64 {

    65 }

    66 

    67 QVGImagePool *QVGImagePool::instance()

    68 {

    69     if (!qt_vg_image_pool)

    70         qt_vg_image_pool = new QVGImagePool();

    71     return qt_vg_image_pool;

    72 }

    73 

    74 void QVGImagePool::setImagePool(QVGImagePool *pool)

    75 {

    76     if (qt_vg_image_pool != pool)

    77         delete qt_vg_image_pool;

    78     qt_vg_image_pool = pool;

    79 }

    80 

    81 VGImage QVGImagePool::createTemporaryImage(VGImageFormat format,

    82                                            VGint width, VGint height,

    83                                            VGbitfield allowedQuality,

    84                                            QVGPixmapData *keepData)

    85 {

    86     VGImage image;

    87     do {

    88         image = vgCreateImage(format, width, height, allowedQuality);

    89         if (image != VG_INVALID_HANDLE)

    90             return image;

    91     } while (reclaimSpace(format, width, height, keepData));

    92     qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d temporary image",

    93              width, height);

    94     return VG_INVALID_HANDLE;

    95 }

    96 

    97 VGImage QVGImagePool::createImageForPixmap(VGImageFormat format,

    98                                            VGint width, VGint height,

    99                                            VGbitfield allowedQuality,

   100                                            QVGPixmapData *data)

   101 {

   102     VGImage image;

   103     do {

   104         image = vgCreateImage(format, width, height, allowedQuality);

   105         if (image != VG_INVALID_HANDLE) {

   106             if (data)

   107                 moveToHeadOfLRU(data);

   108             return image;

   109         }

   110     } while (reclaimSpace(format, width, height, data));

   111     qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d pixmap",

   112              width, height);

   113     return VG_INVALID_HANDLE;

   114 }

   115 

   116 VGImage QVGImagePool::createPermanentImage(VGImageFormat format,

   117                                            VGint width, VGint height,

   118                                            VGbitfield allowedQuality)

   119 {

   120     VGImage image;

   121     do {

   122         image = vgCreateImage(format, width, height, allowedQuality);

   123         if (image != VG_INVALID_HANDLE)

   124             return image;

   125     } while (reclaimSpace(format, width, height, 0));

   126     qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d image",

   127              width, height);

   128     return VG_INVALID_HANDLE;

   129 }

   130 

   131 void QVGImagePool::releaseImage(QVGPixmapData *data, VGImage image)

   132 {

   133     // Very simple strategy at the moment: just destroy the image.

   134     if (data)

   135         removeFromLRU(data);

   136     vgDestroyImage(image);

   137 }

   138 

   139 void QVGImagePool::useImage(QVGPixmapData *data)

   140 {

   141     moveToHeadOfLRU(data);

   142 }

   143 

   144 void QVGImagePool::detachImage(QVGPixmapData *data)

   145 {

   146     removeFromLRU(data);

   147 }

   148 

   149 bool QVGImagePool::reclaimSpace(VGImageFormat format,

   150                                 VGint width, VGint height,

   151                                 QVGPixmapData *data)

   152 {

   153     Q_UNUSED(format);   // For future use in picking the best image to eject.

   154     Q_UNUSED(width);

   155     Q_UNUSED(height);

   156 

   157     if (data)

   158         moveToHeadOfLRU(data);

   159 

   160     QVGPixmapData *lrudata = pixmapLRU();

   161     if (lrudata && lrudata != data) {

   162         lrudata->reclaimImages();

   163         return true;

   164     }

   165 

   166     return false;

   167 }

   168 

   169 void QVGImagePool::hibernate()

   170 {

   171     // Nothing to do here at the moment since the pool does not

   172     // retain VGImage's after they have been released.

   173 }

   174 

   175 void QVGImagePool::moveToHeadOfLRU(QVGPixmapData *data)

   176 {

   177     Q_D(QVGImagePool);

   178     if (data->inLRU) {

   179         if (!data->prevLRU)

   180             return;     // Already at the head of the list.

   181         removeFromLRU(data);

   182     }

   183     data->inLRU = true;

   184     data->nextLRU = d->lruFirst;

   185     data->prevLRU = 0;

   186     if (d->lruFirst)

   187         d->lruFirst->prevLRU = data;

   188     else

   189         d->lruLast = data;

   190     d->lruFirst = data;

   191 }

   192 

   193 void QVGImagePool::removeFromLRU(QVGPixmapData *data)

   194 {

   195     Q_D(QVGImagePool);

   196     if (!data->inLRU)

   197         return;

   198     if (data->nextLRU)

   199         data->nextLRU->prevLRU = data->prevLRU;

   200     else

   201         d->lruLast = data->prevLRU;

   202     if (data->prevLRU)

   203         data->prevLRU->nextLRU = data->nextLRU;

   204     else

   205         d->lruFirst = data->nextLRU;

   206     data->inLRU = false;

   207 }

   208 

   209 QVGPixmapData *QVGImagePool::pixmapLRU()

   210 {

   211     Q_D(QVGImagePool);

   212     return d->lruLast;

   213 }

   214 

   215 QT_END_NAMESPACE