Ladybird: Rename classes ending with Ladybird

Now that all the classes for Ladybird are in the Ladybird namespace, we
don't need them named as Ladybird::FooBarLadybird. For the Qt-specific
classes, we can tack on a Qt at the end for clarity, but FontPlugin and
ImageCodecPlugin no longer have anything to do with Qt.

Ladybird/ImageCodecPlugin.cpp

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "ImageCodecPlugin.h"
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/ImageFormats/ImageDecoder.h>
+
+namespace Ladybird {
+
+ImageCodecPlugin::~ImageCodecPlugin() = default;
+
+Optional<Web::Platform::DecodedImage> ImageCodecPlugin::decode_image(ReadonlyBytes data)
+{
+    auto decoder = Gfx::ImageDecoder::try_create_for_raw_bytes(data);
+
+    if (!decoder || !decoder->frame_count()) {
+        return {};
+    }
+
+    Vector<Web::Platform::Frame> frames;
+    for (size_t i = 0; i < decoder->frame_count(); ++i) {
+        auto frame_or_error = decoder->frame(i);
+        if (frame_or_error.is_error())
+            return {};
+        auto frame = frame_or_error.release_value();
+        frames.append({ move(frame.image), static_cast<size_t>(frame.duration) });
+    }
+
+    return Web::Platform::DecodedImage {
+        decoder->is_animated(),
+        static_cast<u32>(decoder->loop_count()),
+        move(frames),
+    };
+}
+
+}