[Avatar] Cap user avatar upload resolution at 1024x1024 (#7353)

* [Avatar] Cap user avatar upload resolution at 1024x1024

* Remove stylesheet.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/dialogs/dlg_edit_avatar.cpp

@@ -19,6 +19,9 @@ DlgEditAvatar::DlgEditAvatar(QWidget *parent) : QDialog(parent), image()
 
     textLabel = new QLabel(tr("To change your avatar, choose a new image.\nTo remove your current avatar, confirm "
                               "without choosing a new image."));
+    hintLabel = new QLabel(
+        tr("Images are automatically downscaled to at most %1x%1 pixels.").arg(QString::number(MAX_AVATAR_DIMENSION)));
+
     browseButton = new QPushButton(tr("Browse..."));
     connect(browseButton, &QPushButton::clicked, this, &DlgEditAvatar::actBrowse);
 
@@ -26,6 +29,7 @@ DlgEditAvatar::DlgEditAvatar(QWidget *parent) : QDialog(parent), image()
     grid->addWidget(imageLabel, 0, 0, 1, 2);
     grid->addWidget(textLabel, 1, 0);
     grid->addWidget(browseButton, 1, 1);
+    grid->addWidget(hintLabel, 2, 0, 1, 2);
 
     auto *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
     connect(buttonBox, &QDialogButtonBox::accepted, this, &DlgEditAvatar::actOk);
@@ -72,6 +76,10 @@ QByteArray DlgEditAvatar::getImage()
         return QByteArray();
     }
 
+    if (image.width() > MAX_AVATAR_DIMENSION || image.height() > MAX_AVATAR_DIMENSION) {
+        image = image.scaled(MAX_AVATAR_DIMENSION, MAX_AVATAR_DIMENSION, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+    }
+
     for (;;) {
         QByteArray ba;
         QBuffer buffer(&ba);

cockatrice/src/interface/widgets/dialogs/dlg_edit_avatar.h

@@ -29,8 +29,9 @@ private slots:
     void actBrowse();
 
 private:
+    static constexpr int MAX_AVATAR_DIMENSION = 1024;
     QImage image;
-    QLabel *textLabel, *imageLabel;
+    QLabel *textLabel, *imageLabel, *hintLabel;
     QPushButton *browseButton;
 };