feat: add image from pack.png to resource packs

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/minecraft/mod/ResourcePack.cpp

@@ -35,6 +35,15 @@ void ResourcePack::setDescription(QString new_description)
     m_description = new_description;
 }
 
+void ResourcePack::setImage(QImage new_image)
+{
+    QMutexLocker locker(&m_data_lock);
+
+    Q_ASSERT(!new_image.isNull());
+
+    m_pack_image = new_image;
+}
+
 std::pair<Version, Version> ResourcePack::compatibleVersions() const
 {
     if (!s_pack_format_versions.contains(m_pack_format)) {

launcher/minecraft/mod/ResourcePack.h

@@ -2,7 +2,9 @@
 
 #include "Resource.h"
 
+#include <QImage>
 #include <QMutex>
+#include <QPixmap>
 
 class Version;
 
@@ -28,12 +30,19 @@ class ResourcePack : public Resource {
     /** 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) const { return QPixmap::fromImage(m_pack_image).scaled(size); }
+    [[nodiscard]] QSize image_size() const { return m_pack_image.size(); }
+
     /** Thread-safe. */
     void setPackFormat(int new_format_id);
 
     /** Thread-safe. */
     void setDescription(QString new_description);
 
+    /** Thread-safe. */
+    void setImage(QImage new_image);
+
     [[nodiscard]] auto compare(Resource const& other, SortType type) const -> std::pair<int, bool> override;
     [[nodiscard]] bool applyFilter(QRegularExpression filter) const override;
 
@@ -48,4 +57,9 @@ class ResourcePack : public Resource {
     /** The resource pack's description, as defined in the pack.mcmeta file.
      */
     QString m_description;
+
+    /** The resource pack's image, as per the pack.png file.
+     *  TODO: This could probably be just a key into a static image cache.
+     */
+    QImage m_pack_image;
 };

launcher/minecraft/mod/tasks/LocalResourcePackParseTask.cpp

@@ -54,6 +54,16 @@ void LocalResourcePackParseTask::processMCMeta(QByteArray&& raw_data)
     }
 }
 
+void LocalResourcePackParseTask::processPackPNG(QByteArray&& raw_data)
+{
+    auto img = QImage::fromData(raw_data);
+    if (!img.isNull()) {
+        m_resource_pack.setImage(img);
+    } else {
+        qWarning() << "Failed to parse pack.png.";
+    }
+}
+
 void LocalResourcePackParseTask::processAsFolder()
 {
     QFileInfo mcmeta_file_info(FS::PathCombine(m_resource_pack.fileinfo().filePath(), "pack.mcmeta"));
@@ -63,10 +73,23 @@ void LocalResourcePackParseTask::processAsFolder()
             return;
 
         auto data = mcmeta_file.readAll();
-        if (data.isEmpty() || data.isNull())
-            return;
 
         processMCMeta(std::move(data));
+
+        mcmeta_file.close();
+    }
+
+    QFileInfo image_file_info(FS::PathCombine(m_resource_pack.fileinfo().filePath(), "pack.png"));
+    if (image_file_info.isFile()) {
+        QFile mcmeta_file(image_file_info.filePath());
+        if (!mcmeta_file.open(QIODevice::ReadOnly))
+            return;
+
+        auto data = mcmeta_file.readAll();
+
+        processPackPNG(std::move(data));
+
+        mcmeta_file.close();
     }
 }
 
@@ -90,6 +113,21 @@ void LocalResourcePackParseTask::processAsZip()
         processMCMeta(std::move(data));
 
         file.close();
+    }
+
+    if (zip.setCurrentFile("pack.png")) {
+        if (!file.open(QIODevice::ReadOnly)) {
+            qCritical() << "Failed to open file in zip.";
+            zip.close();
+            return;
+        }
+
+        auto data = file.readAll();
+
+        processPackPNG(std::move(data));
+
+        file.close();
+    }
+
     zip.close();
 }
-}

launcher/minecraft/mod/tasks/LocalResourcePackParseTask.h

@@ -21,6 +21,7 @@ class LocalResourcePackParseTask : public Task {
 
    private:
     void processMCMeta(QByteArray&& raw_data);
+    void processPackPNG(QByteArray&& raw_data);
 
     void processAsFolder();
     void processAsZip();