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set the initial cache limit of QPixmapCache by passing it to the QCache constructor

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2024-03-28 10:57:05 +02:00
parent cf1b19860d
commit f99b0e1adc
1 changed files with 8 additions and 19 deletions
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27
src/gui/image/qpixmapcache.cpp
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@ -49,10 +49,9 @@ QT_BEGIN_NAMESPACE
behavior of the QHash and QCache classes.
The cache becomes full when the total size of all pixmaps in the
cache exceeds cacheLimit(). The initial cache limit is
2048 KB (2 MB) on embedded platforms, 10240 KB (10 MB) on desktop
platforms; you can change this by calling setCacheLimit() with the
required value.
cache exceeds cacheLimit(). The initial cache limit is 10240 KB
(10 MB) on desktop, the value can be changed by calling
setCacheLimit() with the required value.
A pixmap takes roughly (\e{width} * \e{height} * \e{depth})/8 bytes of
memory.
@ -64,10 +63,8 @@ QT_BEGIN_NAMESPACE
\sa QCache, QPixmap
*/
static int cache_limit = 10240; // 10 MB cache limit for desktop
typedef QCache<QByteArray, QPixmap> PixmapCacheType;
Q_GLOBAL_STATIC(PixmapCacheType, pm_cache)
Q_GLOBAL_STATIC_WITH_ARGS(PixmapCacheType, pm_cache, (10240))
/*!
\obsolete
@ -84,13 +81,11 @@ Q_GLOBAL_STATIC(PixmapCacheType, pm_cache)
Example:
\snippet doc/src/snippets/code/src_gui_image_qpixmapcache.cpp 0
*/
QPixmap *QPixmapCache::find(const QByteArray &key)
{
return pm_cache()->object(key);
}
/*!
\obsolete
\fn QPixmapCache::find(const QByteArray &key, QPixmap& pixmap)
@ -108,7 +103,6 @@ QPixmap *QPixmapCache::find(const QByteArray &key)
Example:
\snippet doc/src/snippets/code/src_gui_image_qpixmapcache.cpp 1
*/
bool QPixmapCache::find(const QByteArray &key, QPixmap* pixmap)
{
QPixmap *ptr = pm_cache()->object(key);
@ -121,8 +115,8 @@ bool QPixmapCache::find(const QByteArray &key, QPixmap* pixmap)
Inserts a copy of the pixmap \a pixmap associated with the \a key into
the cache.
All pixmaps inserted by the Qt library have a key starting with
"$qt", so your own pixmap keys should never begin "$qt".
All pixmaps inserted by the Katie library have a key starting with
"qt_", so your own pixmap keys should never begin "qt_".
When a pixmap is inserted and the cache is about to exceed its
limit, it removes pixmaps until there is enough room for the
@ -136,7 +130,6 @@ bool QPixmapCache::find(const QByteArray &key, QPixmap* pixmap)
\sa setCacheLimit()
*/
bool QPixmapCache::insert(const QByteArray &key, const QPixmap &pixmap)
{
return pm_cache()->insert(key, new QPixmap(pixmap));
@ -187,10 +180,9 @@ bool QPixmapCache::replace(const QByteArray &key, const QPixmap &pixmap)
\sa setCacheLimit()
*/
int QPixmapCache::cacheLimit()
{
return cache_limit;
return pm_cache()->maxCost();
}
/*!
@ -201,11 +193,9 @@ int QPixmapCache::cacheLimit()
\sa cacheLimit()
*/
void QPixmapCache::setCacheLimit(int n)
{
cache_limit = n;
pm_cache()->setMaxCost(cache_limit);
pm_cache()->setMaxCost(n);
}
/*!
@ -219,7 +209,6 @@ void QPixmapCache::remove(const QByteArray &key)
/*!
Removes all pixmaps from the cache.
*/
void QPixmapCache::clear()
{
pm_cache()->clear();