chore: check if WEBP is supported (#6073)

src/util/SelfCheck.cpp

@@ -0,0 +1,70 @@
+#include "util/SelfCheck.hpp"
+
+#include "common/Literals.hpp"
+
+#include <QBuffer>
+#include <QImageReader>
+#include <QMessageBox>
+#include <QMimeDatabase>
+#include <QStringBuilder>
+#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::selfcheck {
+
+void checkWebp()
+{
+    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::selfcheck

src/util/SelfCheck.hpp

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