Caching in image provider.

Fix room filter.

imports/Spectral/Panel/RoomListPanel.qml

@@ -71,11 +71,11 @@ Item {
             },
             ExpressionFilter {
                 enabled: filter === 2
-                expression: category === 1 || category === 2 || category === 4
+                expression: category === 1 || category === 2 || category === 3
             },
             ExpressionFilter {
                 enabled: filter === 3
-                expression: category === 3 || category === 5
+                expression: category === 4 || category === 5
             }
         ]
     }

src/imageprovider.cpp

@@ -1,16 +1,26 @@
 #include "imageprovider.h"
 
+#include <QDir>
+#include <QFileInfo>
+#include <QStandardPaths>
 #include <QtCore/QDebug>
 #include <QtCore/QThread>
 
 using QMatrixClient::BaseJob;
 
 ThumbnailResponse::ThumbnailResponse(QMatrixClient::Connection* c,
-    QString id, const QSize& size)
-  : c(c),
-    mediaId(std::move(id)),
-    requestedSize(size),
-    errorStr("Image request hasn't started") {
+                                     QString id,
+                                     const QSize& size)
+    : c(c),
+      mediaId(std::move(id)),
+      requestedSize(size),
+      localFile(QStringLiteral("%1/image_provider/%2-%3x%4.png")
+                    .arg(QStandardPaths::writableLocation(
+                             QStandardPaths::CacheLocation),
+                         mediaId,
+                         QString::number(requestedSize.width()),
+                         QString::number(requestedSize.height()))),
+      errorStr("Image request hasn't started") {
   if (requestedSize.isEmpty()) {
     errorStr.clear();
     emit finished();
@@ -18,11 +28,19 @@ ThumbnailResponse::ThumbnailResponse(QMatrixClient::Connection* c,
   }
   if (mediaId.count('/') != 1) {
     errorStr =
-        tr("Media id '%1' doesn't follow server/mediaId pattern")
-            .arg(mediaId);
+        tr("Media id '%1' doesn't follow server/mediaId pattern").arg(mediaId);
     emit finished();
     return;
   }
+
+  QImage cachedImage;
+  if (cachedImage.load(localFile)) {
+    image = cachedImage;
+    errorStr.clear();
+    emit finished();
+    return;
+  }
+
   // Execute a request on the main thread asynchronously
   moveToThread(c->thread());
   QMetaObject::invokeMethod(this, &ThumbnailResponse::startRequest,
@@ -45,6 +63,14 @@ void ThumbnailResponse::prepareResult() {
     QWriteLocker _(&lock);
     if (job->error() == BaseJob::Success) {
       image = job->thumbnail();
+
+      QString localPath = QFileInfo(localFile).absolutePath();
+      QDir dir;
+      if (!dir.exists(localPath))
+        dir.mkpath(localPath);
+
+      image.save(localFile);
+
       errorStr.clear();
     } else if (job->error() == BaseJob::Abandoned) {
       errorStr = tr("Image request has been cancelled");
@@ -83,7 +109,7 @@ void ThumbnailResponse::cancel() {
 }
 
 QQuickImageResponse* ImageProvider::requestImageResponse(
-    const QString& id, const QSize& requestedSize) {
-  qDebug() << "ImageProvider: requesting " << id << "of size" << requestedSize;
+    const QString& id,
+    const QSize& requestedSize) {
   return new ThumbnailResponse(m_connection.load(), id, requestedSize);
 }

src/imageprovider.h

@@ -7,8 +7,8 @@
 #include <connection.h>
 #include <jobs/mediathumbnailjob.h>
 
-#include <QtCore/QReadWriteLock>
 #include <QtCore/QAtomicPointer>
+#include <QtCore/QReadWriteLock>
 
 namespace QMatrixClient {
 class Connection;
@@ -17,11 +17,12 @@ class Connection;
 class ThumbnailResponse : public QQuickImageResponse {
   Q_OBJECT
  public:
-  ThumbnailResponse(QMatrixClient::Connection* c, QString mediaId,
+  ThumbnailResponse(QMatrixClient::Connection* c,
+                    QString mediaId,
                     const QSize& requestedSize);
   ~ThumbnailResponse() override = default;
 
-private slots:
+ private slots:
   void startRequest();
   void prepareResult();
   void doCancel();
@@ -30,11 +31,12 @@ private slots:
   QMatrixClient::Connection* c;
   const QString mediaId;
   const QSize requestedSize;
+  const QString localFile;
   QMatrixClient::MediaThumbnailJob* job = nullptr;
 
   QImage image;
   QString errorStr;
-  mutable QReadWriteLock lock; // Guards ONLY these two members above
+  mutable QReadWriteLock lock;  // Guards ONLY these two members above
 
   QQuickTextureFactory* textureFactory() const override;
   QString errorString() const override;
@@ -49,7 +51,8 @@ class ImageProvider : public QObject, public QQuickAsyncImageProvider {
   explicit ImageProvider() = default;
 
   QQuickImageResponse* requestImageResponse(
-      const QString& id, const QSize& requestedSize) override;
+      const QString& id,
+      const QSize& requestedSize) override;
 
   QMatrixClient::Connection* connection() { return m_connection; }
   void setConnection(QMatrixClient::Connection* connection) {