QGLStrokeCache Class Reference

Classes
struct	CacheInfo

Public Functions
QPainterPath	getStrokedPath (const QPainterPath &path, const QPen &pen)

Protected Functions
QPainterPath	addCacheElement (quint64 hash_val, QPainterPath path, const QPen &pen)
int	maxCacheSize () const

Protected Variables
QGLStrokeTableHash	cache

Private Types
typedef QMultiHash< quint64, CacheInfo >	QGLStrokeTableHash

Detailed Description

Definition at line 939 of file qpaintengine_opengl.cpp.

Typedefs

QGLStrokeTableHash

typedef QMultiHash<quint64, CacheInfo> QGLStrokeCache::QGLStrokeTableHash

private

Definition at line 950 of file qpaintengine_opengl.cpp.

Functions

addCacheElement()

QPainterPath QGLStrokeCache::addCacheElement ( quint64  hash_val, QPainterPath  path, const QPen &  pen  )

inlineprotected

Definition at line 979 of file qpaintengine_opengl.cpp.

                                                                                       {
        if (cache.size() == maxCacheSize()) {
            int elem_to_remove = qrand() % maxCacheSize();
            cache.remove(cache.keys()[elem_to_remove]); // may remove more than 1, but OK
        }
        QPainterPath stroke = strokeForPath(path, pen);
        CacheInfo cache_entry(path, stroke, pen);
        return cache.insert(hash_val, cache_entry).value().stroked_path;
    }

getStrokedPath()

QPainterPath QGLStrokeCache::getStrokedPath ( const QPainterPath &  path, const QPen &  pen  )

inline

Definition at line 953 of file qpaintengine_opengl.cpp.

                                                                                  {
        quint64 hash_val = 0;

        for (int i = 0; i < path.elementCount() && i <= 2; i++) {
            hash_val += quint64(path.elementAt(i).x);
            hash_val += quint64(path.elementAt(i).y);
        }

        QGLStrokeTableHash::const_iterator it = cache.constFind(hash_val);

        if (it == cache.constEnd())
            return addCacheElement(hash_val, path, pen);
        else {
            do {
                const CacheInfo &cache_info = it.value();
                if (cache_info.path == path && cache_info.pen == pen)
                    return cache_info.stroked_path;
                ++it;
            } while (it != cache.constEnd() && it.key() == hash_val);
            // an exact match for this path was not found, create new cache element
            return addCacheElement(hash_val, path, pen);
        }
    }

maxCacheSize()

int QGLStrokeCache::maxCacheSize ( ) const

inlineprotected

Definition at line 978 of file qpaintengine_opengl.cpp.

{ return 500; }

Properties

cache

QGLStrokeTableHash QGLStrokeCache::cache

protected

Definition at line 989 of file qpaintengine_opengl.cpp.

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The documentation for this class was generated from the following file:

• /src/opengl/qpaintengine_opengl.cpp