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authorDavid Boddie <dboddie@trolltech.com>2009-07-14 10:52:48 (GMT)
committerDavid Boddie <dboddie@trolltech.com>2009-07-14 10:59:12 (GMT)
commitb19a64a407a9c69b0df7fd1b12f2f1377a6bc9c0 (patch)
tree0a6e5f16b147cb6f1864ce7bded70790b1651975 /src/gui/image
parent821c7c1486beb6d5e65bd3ac8ba74752fec37fe8 (diff)
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Doc: Review of documentation for
Task-number: 254461 Reviewed-by: Alexis Menard
Diffstat (limited to 'src/gui/image')
-rw-r--r--src/gui/image/qpixmapcache.cpp61
1 files changed, 30 insertions, 31 deletions
diff --git a/src/gui/image/qpixmapcache.cpp b/src/gui/image/qpixmapcache.cpp
index 2ef42ee..82069d0 100644
--- a/src/gui/image/qpixmapcache.cpp
+++ b/src/gui/image/qpixmapcache.cpp
@@ -65,24 +65,22 @@ QT_BEGIN_NAMESPACE
object for caching the pixmaps.
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. The string API is
- very convenient for complex keys but the QPixmapCache::Key API will be very efficient
- and convenient for a 1 object <-> 1 pixmap mapping (then you can store the key as
- a member).
- 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.
+ Using QPixmapCache::Key for keys is faster than using strings. The string API is
+ very convenient for complex keys but the QPixmapCache::Key API will be very
+ efficient and convenient for a one-to-one object-to-pixmap mapping \mdash in
+ this case, you can store the keys as members of an object.
+
+ If two pixmaps are inserted into the cache using equal keys then the
+ last pixmap will replace the first pixmap in the cache. This follows the
+ 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) 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
- with QPixmapCache} explains how to use QPixmapCache to speed up
- applications by caching the results of painting.
+ 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.
+ A pixmap takes roughly (\e{width} * \e{height} * \e{depth})/8 bytes of
+ memory.
\sa QCache, QPixmap
*/
@@ -112,7 +110,7 @@ QPixmapCache::Key::Key(const Key &other)
}
/*!
- Destructor; called immediately before the object is deleted.
+ Destroys the key.
*/
QPixmapCache::Key::~Key()
{
@@ -123,7 +121,8 @@ QPixmapCache::Key::~Key()
/*!
\internal
- Returns true if this key is the same as the given \a key.
+ Returns true if this key is the same as the given \a key; otherwise returns
+ false.
*/
bool QPixmapCache::Key::operator ==(const Key &key) const
{
@@ -407,7 +406,7 @@ QPixmapCache::KeyData* QPMCache::getKeyData(QPixmapCache::Key *key)
Q_GLOBAL_STATIC(QPMCache, pm_cache)
/*!
- \obsolete
+ \obsolete
\overload
Returns the pixmap associated with the \a key in the cache, or
@@ -440,7 +439,7 @@ bool QPixmapCache::find(const QString &key, QPixmap& pixmap)
}
/*!
- Looks for a cached pixmap associated with the \a key in the cache.
+ Looks for a cached pixmap associated with the given \a key in the cache.
If the pixmap is found, the function sets \a pixmap to that pixmap and
returns true; otherwise it leaves \a pixmap alone and returns false.
@@ -459,10 +458,10 @@ bool QPixmapCache::find(const QString &key, QPixmap* pixmap)
}
/*!
- Looks for a cached pixmap associated with the \a key in the cache.
+ Looks for a cached pixmap associated with the given \a key in the cache.
If the pixmap is found, the function sets \a pixmap to that pixmap and
returns true; otherwise it leaves \a pixmap alone and returns false. If
- the pixmap is not found, it means that the \a key is not valid anymore,
+ the pixmap is not found, it means that the \a key is no longer valid,
so it will be released for the next insertion.
\since 4.6
@@ -504,8 +503,8 @@ bool QPixmapCache::insert(const QString &key, const QPixmap &pixmap)
}
/*!
- Inserts a copy of the pixmap \a pixmap into
- the cache and return you the key.
+ Inserts a copy of the given \a pixmap into the cache and returns a key
+ that can be used to retrieve it.
When a pixmap is inserted and the cache is about to exceed its
limit, it removes pixmaps until there is enough room for the
@@ -524,9 +523,9 @@ QPixmapCache::Key QPixmapCache::insert(const QPixmap &pixmap)
}
/*!
- Replace the pixmap associated to the \a key into
- the cache. It return true if the pixmap \a pixmap has been correctly
- inserted into the cache false otherwise.
+ Replaces the pixmap associated with the given \a key with the \a pixmap
+ specified. Returns true if the \a pixmap has been correctly inserted into
+ the cache; otherwise returns false.
\sa setCacheLimit(), insert()
@@ -543,8 +542,8 @@ bool QPixmapCache::replace(const Key &key, const QPixmap &pixmap)
/*!
Returns the cache limit (in kilobytes).
- The default cache limit is 2048 KB for Embedded, 10240 KB for
- Desktops.
+ The default cache limit is 2048 KB on embedded platforms, 10240 KB on
+ desktop platforms.
\sa setCacheLimit()
*/
@@ -557,8 +556,8 @@ int QPixmapCache::cacheLimit()
/*!
Sets the cache limit to \a n kilobytes.
- The default setting is 2048 KB for Embedded, 10240 KB for
- Desktops.
+ The default setting is 2048 KB on embedded platforms, 10240 KB on
+ desktop platforms.
\sa cacheLimit()
*/
@@ -578,7 +577,7 @@ void QPixmapCache::remove(const QString &key)
}
/*!
- Removes the pixmap associated with \a key from the cache and release
+ Removes the pixmap associated with \a key from the cache and releases
the key for a future insertion.
\since 4.6