Add support for loading image plugins through the settings folder of the apps.

CHANGELOG.md

@@ -15,6 +15,9 @@ Version counting is based on semantic versioning (Major.Feature.Patch)
 * Add a theme editor and support for custom themes.
 * Add an application language setting with a system default option in YACReader and YACReaderLibrary.
 
+### All apps
+* Add support for user-installed Qt image format plugins via the shared `plugins/imageformats` folder in the YACReader settings directory.
+
 ## 9.16.4
 
 ### YACReaderLibrary

YACReader/main.cpp

@@ -114,6 +114,7 @@ int main(int argc, char *argv[])
 
     app.setApplicationName("YACReader");
     app.setOrganizationName("YACReader");
+    YACReader::initializeSharedPluginPaths();
 
     auto *appearanceConfig = new AppearanceConfiguration(
             YACReader::getSettingsPath() + "/YACReader.ini", qApp);

YACReaderLibrary/main.cpp

@@ -140,6 +140,7 @@ int main(int argc, char **argv)
     app.setApplicationName("YACReaderLibrary");
     app.setOrganizationName("YACReader");
     app.setApplicationVersion(VERSION);
+    YACReader::initializeSharedPluginPaths();
 
     // Theme initialization
     auto *appearanceConfig = new AppearanceConfiguration(

YACReaderLibraryServer/main.cpp

@@ -48,6 +48,7 @@ int main(int argc, char **argv)
 
     app.setApplicationName("YACReaderLibrary");
     app.setOrganizationName("YACReader");
+    YACReader::initializeSharedPluginPaths();
 
     QString buildNumber = ".0";
 

common/global_info_provider.cpp

@@ -1,5 +1,7 @@
 #include "global_info_provider.h"
 
+#include "yacreader_global.h"
+
 #include <QImageReader>
 #include <QPaintDevice>
 #include <QtCore>
@@ -24,6 +26,7 @@ QString YACReader::getGlobalInfo()
     text.append("\nAPP INFORMATION\n");
     QString supportedImageFormats = QImageReader::supportedImageFormats().join(", ");
     text.append(QString("Image formats supported: %1\n").arg(supportedImageFormats));
+    text.append(QString("User image plugin folder: %1\n").arg(YACReader::getImageFormatsPluginsPath()));
     // append if sqlite driver is available
 #ifdef YACREADER_LIBRARY
     text.append(QString("SQLite driver available: %1\n").arg(QSqlDatabase::isDriverAvailable("QSQLITE") ? "yes" : "no"));

common/yacreader_global.cpp

@@ -12,6 +12,40 @@ QString YACReader::getSettingsPath()
     return QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation);
 }
 
+QString YACReader::getCommonSettingsPath()
+{
+    const auto organizationName = QCoreApplication::organizationName().trimmed();
+    const auto basePath = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation);
+
+    if (organizationName.isEmpty())
+        return basePath;
+
+    return QDir(basePath).filePath(organizationName);
+}
+
+QString YACReader::getCommonSettingsFilePath()
+{
+    return QDir(getCommonSettingsPath()).filePath("YACReaderCommon.ini");
+}
+
+QString YACReader::getPluginsPath()
+{
+    return QDir(getCommonSettingsPath()).filePath("plugins");
+}
+
+QString YACReader::getImageFormatsPluginsPath()
+{
+    return QDir(getPluginsPath()).filePath("imageformats");
+}
+
+void YACReader::initializeSharedPluginPaths()
+{
+    QDir().mkpath(getImageFormatsPluginsPath());
+
+    const QString pluginsPath = QDir(getPluginsPath()).absolutePath();
+    QCoreApplication::addLibraryPath(pluginsPath);
+}
+
 QString YACReader::colorToName(LabelColors colors)
 {
     switch (colors) {

common/yacreader_global.h

@@ -103,6 +103,11 @@ QDataStream &operator<<(QDataStream &stream, const OpenComicSource &source);
 QDataStream &operator>>(QDataStream &stream, OpenComicSource &source);
 
 QString getSettingsPath();
+QString getCommonSettingsPath();
+QString getCommonSettingsFilePath();
+QString getPluginsPath();
+QString getImageFormatsPluginsPath();
+void initializeSharedPluginPaths();
 QString colorToName(LabelColors colors);
 QString labelColorToRGBString(LabelColors color);
 QLibrary *load7zLibrary();

custom_widgets/whats_new_controller.cpp

@@ -7,9 +7,7 @@ YACReader::WhatsNewController::WhatsNewController() { }
 
 void YACReader::WhatsNewController::showWhatsNewIfNeeded(QWidget *fromParent)
 {
-    QSettings commonSettings(QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) +
-                                     "/YACReader/YACReaderCommon.ini",
-                             QSettings::IniFormat);
+    QSettings commonSettings(YACReader::getCommonSettingsFilePath(), QSettings::IniFormat);
 
     if (commonSettings.value("LAST_VERSION_INSTALLED").toString() != VERSION) {
         showWhatsNew(fromParent);

custom_widgets/whats_new_dialog.cpp

@@ -57,6 +57,9 @@ YACReader::WhatsNewDialog::WhatsNewDialog(QWidget *parent)
                    "   &#8226; Add a theme editor and support for custom themes<br/>"
                    "   &#8226; Add an application language setting with a system default option in YACReader and YACReaderLibrary<br/>"
                    "<br/>"
+                   "<span style=\"font-weight:600\">All apps</span><br/>"
+                   "   &#8226; Add support for user-installed Qt image format plugins via the shared <i>plugins/imageformats</i> folder in the YACReader settings directory<br/>"
+                   "<br/>"
                    "I hope you enjoy the new update. Please, if you like YACReader consider to become a patron in <a href=\"https://www.patreon.com/yacreader\" style=\"color:%1;\">Patreon</a> "
                    "or donate some money using <a href=\"https://www.paypal.com/donate?business=5TAMNQCDDMVP8&item_name=Support+YACReader\" style=\"color:%1;\">Pay-Pal</a> and help keeping the project alive. "
                    "Remember that there is an iOS version available in the <a href=\"https://apps.apple.com/app/id635717885\" style=\"color:%1;\">Apple App Store</a>, "