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#include "worker.hpp"
#include <chrono>
#include <thread>
Worker *Worker::inst = 0;
QMutex Worker::workerLock;
QMutex Worker::lock;
// QPixmaps don't like existing on non GUI threads.
// Because of this we have to:
// 1. Convert to image on the GUI thread
// 2. Queue onto the worker, where:
// 1. Convert the image to the right format
// 2. Consume the image.
void Worker::queue(WorkerContext *context) {
QMutexLocker ml(&lock);
_WorkerContext *c = new _WorkerContext;
c->image = context->pixmap.toImage();
c->consumer = context->consumer;
c->targetFormat = context->targetFormat;
c->underlyingThing = context;
inst->qqueue.enqueue(c);
}
void Worker::init() {
QMutexLocker ml(&workerLock);
if (!inst) inst = new Worker;
}
Worker::Worker() : QObject() {
thr = new QThread;
moveToThread(thr);
connect(thr, &QThread::started, this, &Worker::process);
connect(thr, &QThread::finished, thr, &QThread::deleteLater);
connect(this, &Worker::finished, this, &Worker::deleteLater);
connect(thr, &QThread::finished, thr, &QThread::deleteLater);
thr->start();
}
Worker::~Worker() {
_end();
}
void Worker::end() {
inst->_end();
}
void Worker::_end() {
QMutexLocker ml(&endLock);
_ended = true;
}
bool Worker::ended() {
QMutexLocker ml(&endLock);
return _ended;
}
void Worker::process() {
while (!ended()) {
lock.lock();
if (!qqueue.isEmpty()) {
_WorkerContext *c = qqueue.dequeue();
c->consumer(c->image.convertToFormat(c->targetFormat));
delete c->underlyingThing;
delete c;
}
lock.unlock();
std::this_thread::sleep_for(std::chrono::milliseconds(10)); // STL likes it's scopes
}
emit finished();
}