71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
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#include "albumcoverloader.h"
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#include <QPainter>
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AlbumCoverLoader::AlbumCoverLoader(QObject* parent)
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: QObject(parent),
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height_(120),
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next_id_(0)
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{
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}
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void AlbumCoverLoader::Clear() {
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QMutexLocker l(&mutex_);
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tasks_.clear();
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}
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quint64 AlbumCoverLoader::LoadImageAsync(const QString& art_automatic,
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const QString& art_manual) {
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Task task;
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task.art_automatic = art_automatic;
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task.art_manual = art_manual;
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{
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QMutexLocker l(&mutex_);
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task.id = next_id_ ++;
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tasks_.enqueue(task);
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}
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metaObject()->invokeMethod(this, "ProcessTasks", Qt::QueuedConnection);
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return task.id;
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}
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void AlbumCoverLoader::ProcessTasks() {
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forever {
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// Get the next task
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Task task;
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{
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QMutexLocker l(&mutex_);
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if (tasks_.isEmpty())
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return;
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task = tasks_.dequeue();
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}
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// Try to load the image
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QImage image;
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if (!task.art_manual.isEmpty())
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image.load(task.art_manual);
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if (!task.art_automatic.isEmpty() && image.isNull())
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image.load(task.art_automatic);
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if (!image.isNull()) {
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// Scale the image down
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image = image.scaled(QSize(height_, height_), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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// Pad the image to height_ x height_
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QImage bigger_image(height_, height_, QImage::Format_ARGB32);
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bigger_image.fill(0);
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QPainter p(&bigger_image);
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p.drawImage((height_ - image.width()) / 2, (height_ - image.height()) / 2,
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image);
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p.end();
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image = bigger_image;
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}
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emit ImageLoaded(task.id, image);
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}
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}
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