chore: check if WEBP is supported

src/CMakeLists.txt

@@ -537,6 +537,8 @@ set(SOURCE_FILES
         util/RenameThread.hpp
         util/SampleData.cpp
         util/SampleData.hpp
+        util/SanityCheckImages.cpp
+        util/SanityCheckImages.hpp
         util/SharedPtrElementLess.hpp
         util/SignalListener.hpp
         util/StreamLink.cpp

src/RunGui.cpp

@@ -11,6 +11,7 @@
 #include "singletons/Settings.hpp"
 #include "singletons/Updates.hpp"
 #include "util/CombinePath.hpp"
+#include "util/SanityCheckImages.hpp"
 #include "widgets/dialogs/LastRunCrashDialog.hpp"
 
 #include <QApplication>
@@ -241,6 +242,8 @@ void runGui(QApplication &a, const Paths &paths, Settings &settings,
     }
 #endif
 
+    sanityCheckImages();
+
     updates.deleteOldFiles();
 
     // Clear the cache 1 minute after start.

src/util/SanityCheckImages.cpp

@@ -0,0 +1,69 @@
+#include "util/SanityCheckImages.hpp"
+
+#include "common/Literals.hpp"
+
+#include <QBuffer>
+#include <QImageReader>
+#include <QMessageBox>
+#include <QMimeDatabase>
+#include <QStringList>
+
+namespace {
+
+using namespace chatterino::literals;
+
+// lossy image from https://developers.google.com/speed/webp/faq#in_your_own_javascript
+const QByteArray WEBP_IMAGE =
+    "RIFF\x22\0\0\0WEBPVP8\x20\x16\0\0\0\x30\x01\0\x9d\x01\x2a\x01\0\x01\0\x0e\xc0\xfe\x25\xa4\0\x03p\0\0\0\0"_ba;
+
+}  // namespace
+
+namespace chatterino {
+
+void sanityCheckImages()
+{
+    QStringList messages;
+    QMimeDatabase mimeDb;
+
+    auto mime = mimeDb.mimeTypeForData(WEBP_IMAGE);
+    if (!mime.inherits("image/webp"))
+    {
+        messages.emplace_back(u"Failed to determine MIME type for WEBP image - "
+                              u"detected MIME type: \"" %
+                              mime.name() % '"');
+    }
+
+    QBuffer buffer;
+    buffer.setData(WEBP_IMAGE);
+    QImageReader reader(&buffer);
+
+    if (reader.canRead())
+    {
+        if (reader.imageCount() != 1)
+        {
+            messages.emplace_back(u"Minimal WEBP image doesn't have one (1) "
+                                  u"expected image - got: " %
+                                  QString::number(reader.imageCount()) %
+                                  u" - error: " % reader.errorString());
+        }
+        reader.read();
+    }
+    else
+    {
+        messages.emplace_back(
+            u"Minimal WEBP image can't be read - QImageReader::canRead "
+            u"returned false - error: \"" %
+            reader.errorString() % '"');
+    }
+
+    if (!messages.empty())
+    {
+        QMessageBox::warning(
+            nullptr, u"Chatterino - Sanity Check"_s,
+            u"Your Chatterino instance is not able to load WEBP files.\nMake "
+            u"sure you have qtimageformats installed.\n\n" %
+                messages.join(u"\n\n"));
+    }
+}
+
+}  // namespace chatterino

src/util/SanityCheckImages.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+namespace chatterino {
+
+/// Checks if WEBPs can be loaded
+void sanityCheckImages();
+
+}  // namespace chatterino