feat: add texture pack parsing

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

launcher/minecraft/mod/TexturePack.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include "Resource.h"
+
+#include <QImage>
+#include <QMutex>
+#include <QPixmap>
+#include <QPixmapCache>
+
+class Version;
+
+/* TODO:
+ *
+ * Store localized descriptions
+ * */
+
+class TexturePack : public Resource {
+    Q_OBJECT
+   public:
+    using Ptr = shared_qobject_ptr<Resource>;
+
+    TexturePack(QObject* parent = nullptr) : Resource(parent) {}
+    TexturePack(QFileInfo file_info) : Resource(file_info) {}
+
+    /** Gets the description of the resource pack. */
+    [[nodiscard]] QString description() const { return m_description; }
+
+    /** Gets the image of the resource pack, converted to a QPixmap for drawing, and scaled to size. */
+    [[nodiscard]] QPixmap image(QSize size);
+
+    /** Thread-safe. */
+    void setDescription(QString new_description);
+
+    /** Thread-safe. */
+    void setImage(QImage new_image);
+
+   protected:
+    mutable QMutex m_data_lock;
+
+    /** The texture pack's description, as defined in the pack.txt file.
+     */
+    QString m_description;
+
+    /** The texture pack's image file cache key, for access in the QPixmapCache global instance.
+     *
+     *  The 'was_ever_used' state simply identifies whether the key was never inserted on the cache (true),
+     *  so as to tell whether a cache entry is inexistent or if it was just evicted from the cache.
+     */
+    struct {
+        QPixmapCache::Key key;
+        bool was_ever_used = false;
+    } m_pack_image_cache_key;
+};