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#pragma once
#include <QCoreApplication>
#include <QPixmapCache>
#include <QThread>
#include <QTime>
#include <QDebug>
#define GET_TYPE() \
Qt::ConnectionType type; \
if (QThread::currentThread() != QCoreApplication::instance()->thread()) \
type = Qt::BlockingQueuedConnection; \
else \
type = Qt::DirectConnection;
#define DEFINE_FUNC_NO_PARAM(NAME, RET_TYPE) \
static RET_TYPE NAME() \
{ \
RET_TYPE ret; \
GET_TYPE() \
QMetaObject::invokeMethod(s_instance, "_" #NAME, type, Q_RETURN_ARG(RET_TYPE, ret)); \
return ret; \
}
#define DEFINE_FUNC_ONE_PARAM(NAME, RET_TYPE, PARAM_1_TYPE) \
static RET_TYPE NAME(PARAM_1_TYPE p1) \
{ \
RET_TYPE ret; \
GET_TYPE() \
QMetaObject::invokeMethod(s_instance, "_" #NAME, type, Q_RETURN_ARG(RET_TYPE, ret), Q_ARG(PARAM_1_TYPE, p1)); \
return ret; \
}
#define DEFINE_FUNC_TWO_PARAM(NAME, RET_TYPE, PARAM_1_TYPE, PARAM_2_TYPE) \
static RET_TYPE NAME(PARAM_1_TYPE p1, PARAM_2_TYPE p2) \
{ \
RET_TYPE ret; \
GET_TYPE() \
QMetaObject::invokeMethod(s_instance, "_" #NAME, type, Q_RETURN_ARG(RET_TYPE, ret), Q_ARG(PARAM_1_TYPE, p1), \
Q_ARG(PARAM_2_TYPE, p2)); \
return ret; \
}
/** A wrapper around QPixmapCache with thread affinity with the main thread.
*/
class PixmapCache final : public QObject {
Q_OBJECT
public:
PixmapCache(QObject* parent) : QObject(parent) {}
~PixmapCache() override = default;
static PixmapCache& instance() { return *s_instance; }
static void setInstance(PixmapCache* i) { s_instance = i; }
public:
DEFINE_FUNC_NO_PARAM(cacheLimit, int)
DEFINE_FUNC_NO_PARAM(clear, bool)
DEFINE_FUNC_TWO_PARAM(find, bool, const QString&, QPixmap*)
DEFINE_FUNC_TWO_PARAM(find, bool, const QPixmapCache::Key&, QPixmap*)
DEFINE_FUNC_TWO_PARAM(insert, bool, const QString&, const QPixmap&)
DEFINE_FUNC_ONE_PARAM(insert, QPixmapCache::Key, const QPixmap&)
DEFINE_FUNC_ONE_PARAM(remove, bool, const QString&)
DEFINE_FUNC_ONE_PARAM(remove, bool, const QPixmapCache::Key&)
DEFINE_FUNC_TWO_PARAM(replace, bool, const QPixmapCache::Key&, const QPixmap&)
DEFINE_FUNC_ONE_PARAM(setCacheLimit, bool, int)
DEFINE_FUNC_NO_PARAM(markCacheMissByEviciton, bool)
DEFINE_FUNC_ONE_PARAM(setFastEvictionThreshold, bool, int)
// NOTE: Every function returns something non-void to simplify the macros.
private slots:
int _cacheLimit() { return QPixmapCache::cacheLimit(); }
bool _clear()
{
QPixmapCache::clear();
return true;
}
bool _find(const QString& key, QPixmap* pixmap) { return QPixmapCache::find(key, pixmap); }
bool _find(const QPixmapCache::Key& key, QPixmap* pixmap) { return QPixmapCache::find(key, pixmap); }
bool _insert(const QString& key, const QPixmap& pixmap) { return QPixmapCache::insert(key, pixmap); }
QPixmapCache::Key _insert(const QPixmap& pixmap) { return QPixmapCache::insert(pixmap); }
bool _remove(const QString& key)
{
QPixmapCache::remove(key);
return true;
}
bool _remove(const QPixmapCache::Key& key)
{
QPixmapCache::remove(key);
return true;
}
bool _replace(const QPixmapCache::Key& key, const QPixmap& pixmap) { return QPixmapCache::replace(key, pixmap); }
bool _setCacheLimit(int n)
{
QPixmapCache::setCacheLimit(n);
return true;
}
/**
* Mark that a cache miss occurred because of a eviction if too many of these occur too fast the cache size is increased
* @return if the cache size was increased
*/
bool _markCacheMissByEviciton()
{
auto now = QTime::currentTime();
if (!m_last_cache_miss_by_eviciton.isNull()) {
auto diff = m_last_cache_miss_by_eviciton.msecsTo(now);
if (diff < 1000) { // less than a second ago
++m_consecutive_fast_evicitons;
} else {
m_consecutive_fast_evicitons = 0;
}
}
m_last_cache_miss_by_eviciton = now;
if (m_consecutive_fast_evicitons >= m_consecutive_fast_evicitons_threshold) {
// double the cache size
auto newSize = _cacheLimit() * 2;
qDebug() << m_consecutive_fast_evicitons << "pixmap cache misses by eviction happened too fast, doubling cache size to"
<< newSize;
_setCacheLimit(newSize);
m_consecutive_fast_evicitons = 0;
return true;
}
return false;
}
bool _setFastEvictionThreshold(int threshold)
{
m_consecutive_fast_evicitons_threshold = threshold;
return true;
}
private:
static PixmapCache* s_instance;
QTime m_last_cache_miss_by_eviciton;
int m_consecutive_fast_evicitons = 0;
int m_consecutive_fast_evicitons_threshold = 15;
};
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