diff options
Diffstat (limited to 'src/gui/image/qpixmapcache.cpp')
| -rw-r--r-- | src/gui/image/qpixmapcache.cpp | 367 |
1 files changed, 312 insertions, 55 deletions
diff --git a/src/gui/image/qpixmapcache.cpp b/src/gui/image/qpixmapcache.cpp index 458d6b9..810ce65 100644 --- a/src/gui/image/qpixmapcache.cpp +++ b/src/gui/image/qpixmapcache.cpp @@ -40,13 +40,9 @@ ****************************************************************************/ #include "qpixmapcache.h" -#include "qcache.h" #include "qobject.h" #include "qdebug.h" - -#include "qpaintengine.h" -#include <private/qimage_p.h> -#include <private/qpixmap_raster_p.h> +#include "qpixmapcache_p.h" QT_BEGIN_NAMESPACE @@ -68,15 +64,17 @@ QT_BEGIN_NAMESPACE access the global pixmap cache. It creates an internal QCache object for caching the pixmaps. - The cache associates a pixmap with a string (key). If two pixmaps - are inserted into the cache using equal keys, then the last pixmap - will hide the first pixmap. The QHash and QCache classes do + The cache associates a pixmap with a string as a key or with a QPixmapCache::Key. + The QPixmapCache::Key is faster than using strings as key. + If two pixmaps are inserted into the cache using equal keys, then the + last pixmap will hide the first pixmap. The QHash and QCache classes do exactly the same. The cache becomes full when the total size of all pixmaps in the - cache exceeds cacheLimit(). The initial cache limit is 1024 KB (1 - MB); it is changed with setCacheLimit(). A pixmap takes roughly - (\e{width} * \e{height} * \e{depth})/8 bytes of memory. + cache exceeds cacheLimit(). The initial cache limit is + 2048 KB(2 MB) for Embedded, 10240 KB (10 + MB) for Desktops; it is changed with setCacheLimit(). + A pixmap takes roughly (\e{width} * \e{height} * \e{depth})/8 bytes of memory. The \e{Qt Quarterly} article \l{http://doc.trolltech.com/qq/qq12-qpixmapcache.html}{Optimizing @@ -86,58 +84,123 @@ QT_BEGIN_NAMESPACE \sa QCache, QPixmap */ -#if defined(Q_WS_QWS) || defined(Q_OS_WINCE) +#if defined(Q_WS_QWS) || defined(Q_WS_WINCE) static int cache_limit = 2048; // 2048 KB cache limit for embedded #else static int cache_limit = 10240; // 10 MB cache limit for desktop #endif -// XXX: hw: is this a general concept we need to abstract? -class QDetachedPixmap : public QPixmap +/*! + Constructs an empty Key object. +*/ +QPixmapCache::Key::Key() : d(0) { -public: - QDetachedPixmap(const QPixmap &pix) : QPixmap(pix) - { - if (data && data->classId() == QPixmapData::RasterClass) { - QRasterPixmapData *d = static_cast<QRasterPixmapData*>(data); - if (!d->image.isNull() && d->image.d->paintEngine - && !d->image.d->paintEngine->isActive()) - { - delete d->image.d->paintEngine; - d->image.d->paintEngine = 0; - } - } +} + +/*! + \internal + Constructs a copy of \a other. +*/ +QPixmapCache::Key::Key(const Key &other) +{ + if (other.d) + ++(other.d->ref); + d = other.d; +} + +/*! + Destructor; called immediately before the object is deleted. +*/ +QPixmapCache::Key::~Key() +{ + if (d && --(d->ref) == 0) + delete d; +} + +/*! + \internal + + Returns true if this key is the same as the given \a key. +*/ +bool QPixmapCache::Key::operator ==(const Key &key) const +{ + return (d == key.d); +} + +/*! + \internal +*/ +QPixmapCache::Key &QPixmapCache::Key::operator =(const Key &other) +{ + if (d != other.d) { + if (other.d) + ++(other.d->ref); + if (d && --(d->ref) == 0) + delete d; + d = other.d; } -}; + return *this; +} -class QPMCache : public QObject, public QCache<qint64, QDetachedPixmap> +class QPMCache : public QObject, public QCache<QPixmapCache::Key, QDetachedPixmap> { Q_OBJECT public: - QPMCache() - : QObject(0), - QCache<qint64, QDetachedPixmap>(cache_limit * 1024), - theid(0), ps(0), t(false) { } - ~QPMCache() { } + QPMCache(); + ~QPMCache(); void timerEvent(QTimerEvent *); bool insert(const QString& key, const QPixmap &pixmap, int cost); + QPixmapCache::Key insert(const QPixmap &pixmap, int cost); + bool replace(const QPixmapCache::Key &key, const QPixmap &pixmap, int cost); bool remove(const QString &key); + bool remove(const QPixmapCache::Key &key); + + void resizeKeyArray(int size); + QPixmapCache::Key createKey(); + void releaseKey(const QPixmapCache::Key &key); + void clear(); QPixmap *object(const QString &key) const; + QPixmap *object(const QPixmapCache::Key &key) const; + + static inline QPixmapCache::KeyData *get(const QPixmapCache::Key &key) + {return key.d;} + + static QPixmapCache::KeyData* getKeyData(QPixmapCache::Key *key); private: - QHash<QString, qint64> cacheKeys; + int *keyArray; int theid; int ps; + int keyArraySize; + int freeKey; + QHash<QString, QPixmapCache::Key> cacheKeys; bool t; }; + QT_BEGIN_INCLUDE_NAMESPACE #include "qpixmapcache.moc" QT_END_INCLUDE_NAMESPACE +static uint qHash(const QPixmapCache::Key &k) +{ + return qHash(QPMCache::get(k)->key); +} + +QPMCache::QPMCache() + : QObject(0), + QCache<QPixmapCache::Key, QDetachedPixmap>(cache_limit * 1024), + keyArray(0), theid(0), ps(0), keyArraySize(0), freeKey(0), t(false) +{ +} +QPMCache::~QPMCache() +{ + free(keyArray); +} + /* - This is supposed to cut the cache size down by about 80-90% in a + This is supposed to cut the cache size down by about 25% in a minute once the application becomes idle, to let any inserted pixmap remain in the cache for some time before it becomes a candidate for cleaning-up, and to not cut down the size of the cache while the @@ -146,23 +209,28 @@ QT_END_INCLUDE_NAMESPACE When the last pixmap has been deleted from the cache, kill the timer so Qt won't keep the CPU from going into sleep mode. */ - void QPMCache::timerEvent(QTimerEvent *) { int mc = maxCost(); bool nt = totalCost() == ps; + QList<QPixmapCache::Key> keys = QCache<QPixmapCache::Key, QDetachedPixmap>::keys(); setMaxCost(nt ? totalCost() * 3 / 4 : totalCost() -1); setMaxCost(mc); ps = totalCost(); - QHash<QString, qint64>::iterator it = cacheKeys.begin(); + QHash<QString, QPixmapCache::Key>::iterator it = cacheKeys.begin(); while (it != cacheKeys.end()) { if (!contains(it.value())) { + releaseKey(it.value()); it = cacheKeys.erase(it); } else { ++it; } } + for (int i = 0; i < keys.size(); ++i) { + if (!contains(keys.at(i))) + releaseKey(keys.at(i)); + } if (!size()) { killTimer(theid); @@ -176,38 +244,154 @@ void QPMCache::timerEvent(QTimerEvent *) QPixmap *QPMCache::object(const QString &key) const { - return QCache<qint64, QDetachedPixmap>::object(cacheKeys.value(key, -1)); + QPixmapCache::Key cacheKey = cacheKeys.value(key); + if (!cacheKey.d || !cacheKey.d->isValid) { + const_cast<QPMCache *>(this)->cacheKeys.remove(key); + return 0; + } + QPixmap *ptr = QCache<QPixmapCache::Key, QDetachedPixmap>::object(cacheKey); + //We didn't find the pixmap in the cache, the key is not valid anymore + if (!ptr) { + const_cast<QPMCache *>(this)->cacheKeys.remove(key); + const_cast<QPMCache *>(this)->releaseKey(cacheKey); + } + return ptr; } +QPixmap *QPMCache::object(const QPixmapCache::Key &key) const +{ + Q_ASSERT(key.d->isValid); + QPixmap *ptr = QCache<QPixmapCache::Key, QDetachedPixmap>::object(key); + //We didn't find the pixmap in the cache, the key is not valid anymore + if (!ptr) + const_cast<QPMCache *>(this)->releaseKey(key); + return ptr; +} bool QPMCache::insert(const QString& key, const QPixmap &pixmap, int cost) { - qint64 cacheKey = pixmap.cacheKey(); - if (QCache<qint64, QDetachedPixmap>::object(cacheKey)) { + QPixmapCache::Key cacheKey; + QPixmapCache::Key oldCacheKey = cacheKeys.value(key); + //If for the same key we add already a pixmap we should delete it + if (oldCacheKey.d) { + QCache<QPixmapCache::Key, QDetachedPixmap>::remove(oldCacheKey); + cacheKey = oldCacheKey; + } else { + cacheKey = createKey(); + } + + bool success = QCache<QPixmapCache::Key, QDetachedPixmap>::insert(cacheKey, new QDetachedPixmap(pixmap), cost); + if (success) { cacheKeys.insert(key, cacheKey); - return true; + if (!theid) { + theid = startTimer(30000); + t = false; + } + } else { + //Insertion failed we released the new allocated key + releaseKey(cacheKey); } - qint64 oldCacheKey = cacheKeys.value(key, -1); - //If for the same key we add already a pixmap we should delete it - if (oldCacheKey != -1) - QCache<qint64, QDetachedPixmap>::remove(oldCacheKey); + return success; +} - bool success = QCache<qint64, QDetachedPixmap>::insert(cacheKey, new QDetachedPixmap(pixmap), cost); +QPixmapCache::Key QPMCache::insert(const QPixmap &pixmap, int cost) +{ + QPixmapCache::Key cacheKey = createKey(); + bool success = QCache<QPixmapCache::Key, QDetachedPixmap>::insert(cacheKey, new QDetachedPixmap(pixmap), cost); if (success) { - cacheKeys.insert(key, cacheKey); if (!theid) { theid = startTimer(30000); t = false; } + } else { + //Insertion failed we released the key and return an invalid one + releaseKey(cacheKey); + } + return cacheKey; +} + +bool QPMCache::replace(const QPixmapCache::Key &key, const QPixmap &pixmap, int cost) +{ + Q_ASSERT(key.d->isValid); + //If for the same key we add already a pixmap we should delete it + QCache<QPixmapCache::Key, QDetachedPixmap>::remove(key); + + bool success = QCache<QPixmapCache::Key, QDetachedPixmap>::insert(key, new QDetachedPixmap(pixmap), cost); + if (success && !theid) { + theid = startTimer(30000); + t = false; } return success; } bool QPMCache::remove(const QString &key) { - qint64 cacheKey = cacheKeys.value(key, -1); + QPixmapCache::Key cacheKey = cacheKeys.value(key); + //The key was not in the cache + if (!cacheKey.d) + return false; cacheKeys.remove(key); - return QCache<qint64, QDetachedPixmap>::remove(cacheKey); + releaseKey(cacheKey); + return QCache<QPixmapCache::Key, QDetachedPixmap>::remove(cacheKey); +} + +bool QPMCache::remove(const QPixmapCache::Key &key) +{ + releaseKey(key); + return QCache<QPixmapCache::Key, QDetachedPixmap>::remove(key); +} + +void QPMCache::resizeKeyArray(int size) +{ + if (size <= keyArraySize || size == 0) + return; + keyArray = reinterpret_cast<int *>(realloc(keyArray, size * sizeof(int))); + for (int i = keyArraySize; i != size; ++i) + keyArray[i] = i + 1; + keyArraySize = size; +} + +QPixmapCache::Key QPMCache::createKey() +{ + if (freeKey == keyArraySize) + resizeKeyArray(keyArraySize ? keyArraySize << 1 : 2); + int id = freeKey; + freeKey = keyArray[id]; + QPixmapCache::Key key; + QPixmapCache::KeyData *d = QPMCache::getKeyData(&key); + d->key = ++id; + return key; +} + +void QPMCache::releaseKey(const QPixmapCache::Key &key) +{ + if (key.d->key > keyArraySize || key.d->key <= 0) + return; + key.d->key--; + keyArray[key.d->key] = freeKey; + freeKey = key.d->key; + key.d->isValid = false; + key.d->key = 0; +} + +void QPMCache::clear() +{ + free(keyArray); + keyArray = 0; + freeKey = 0; + keyArraySize = 0; + //Mark all keys as invalid + QList<QPixmapCache::Key> keys = QCache<QPixmapCache::Key, QDetachedPixmap>::keys(); + for (int i = 0; i < keys.size(); ++i) + keys.at(i).d->isValid = false; + QCache<QPixmapCache::Key, QDetachedPixmap>::clear(); +} + +QPixmapCache::KeyData* QPMCache::getKeyData(QPixmapCache::Key *key) +{ + if (!key->d) + key->d = new QPixmapCache::KeyData; + return key->d; } Q_GLOBAL_STATIC(QPMCache, pm_cache) @@ -222,7 +406,7 @@ Q_GLOBAL_STATIC(QPMCache, pm_cache) \warning If valid, you should copy the pixmap immediately (this is fast). Subsequent insertions into the cache could cause the pointer to become invalid. For this reason, we recommend you use - find(const QString&, QPixmap&) instead. + bool find(const QString&, QPixmap*) instead. Example: \snippet doc/src/snippets/code/src_gui_image_qpixmapcache.cpp 0 @@ -235,6 +419,17 @@ QPixmap *QPixmapCache::find(const QString &key) /*! + \obsolete + + Use bool find(const QString&, QPixmap*) instead. +*/ + +bool QPixmapCache::find(const QString &key, QPixmap& pixmap) +{ + return find(key, &pixmap); +} + +/*! Looks for a cached pixmap associated with the \a key in the cache. If the pixmap is found, the function sets \a pm to that pixmap and returns true; otherwise it leaves \a pm alone and returns false. @@ -243,14 +438,31 @@ QPixmap *QPixmapCache::find(const QString &key) \snippet doc/src/snippets/code/src_gui_image_qpixmapcache.cpp 1 */ -bool QPixmapCache::find(const QString &key, QPixmap& pm) +bool QPixmapCache::find(const QString &key, QPixmap* pixmap) { QPixmap *ptr = pm_cache()->object(key); - if (ptr) - pm = *ptr; + if (ptr && pixmap) + *pixmap = *ptr; return ptr != 0; } +/*! + Looks for a cached pixmap associated with the \a key in the cache. + If the pixmap is found, the function sets \a pm to that pixmap and + returns true; otherwise it leaves \a pm alone and returns false. If + the pixmap is not found, it means that the \a key is not valid anymore, + so it will be released for the next insertion. +*/ +bool QPixmapCache::find(const Key &key, QPixmap* pixmap) +{ + //The key is not valid anymore, a flush happened before probably + if (!key.d || !key.d->isValid) + return false; + QPixmap *ptr = pm_cache()->object(key); + if (ptr && pixmap) + *pixmap = *ptr; + return ptr != 0; +} /*! Inserts a copy of the pixmap \a pm associated with the \a key into @@ -272,9 +484,43 @@ bool QPixmapCache::find(const QString &key, QPixmap& pm) \sa setCacheLimit() */ -bool QPixmapCache::insert(const QString &key, const QPixmap &pm) +bool QPixmapCache::insert(const QString &key, const QPixmap &pixmap) +{ + return pm_cache()->insert(key, pixmap, pixmap.width() * pixmap.height() * pixmap.depth() / 8); +} + +/*! + Inserts a copy of the pixmap \a pm into + the cache and return you the key. The key is always greater than 0. + If the key is equals 0 then the insertion failed. + + When a pixmap is inserted and the cache is about to exceed its + limit, it removes pixmaps until there is enough room for the + pixmap to be inserted. + + The oldest pixmaps (least recently accessed in the cache) are + deleted when more space is needed. + + \sa setCacheLimit(), replace() +*/ +QPixmapCache::Key QPixmapCache::insert(const QPixmap &pixmap) +{ + return pm_cache()->insert(pixmap, pixmap.width() * pixmap.height() * pixmap.depth() / 8); +} + +/*! + Replace the pixmap associated to the \a key into + the cache. It return true if the pixmap \a pm has been correctly + inserted into the cache false otherwise. + + \sa setCacheLimit(), insert() +*/ +bool QPixmapCache::replace(const Key &key, const QPixmap &pixmap) { - return pm_cache()->insert(key, pm, pm.width() * pm.height() * pm.depth() / 8); + //The key is not valid anymore, a flush happened before probably + if (!key.d || !key.d->isValid) + return false; + return pm_cache()->replace(key, pixmap, pixmap.width() * pixmap.height() * pixmap.depth() / 8); } /*! @@ -314,6 +560,17 @@ void QPixmapCache::remove(const QString &key) pm_cache()->remove(key); } +/*! + Removes the pixmap associated with \a key from the cache and release + the key for a future insertion. +*/ +void QPixmapCache::remove(const Key &key) +{ + //The key is not valid anymore, a flush happened before probably + if (!key.d || !key.d->isValid) + return; + pm_cache()->remove(key); +} /*! Removes all pixmaps from the cache. |