LibGfx: Add a TIFF loader

Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2023, Lucas Chollet <lucas.chollet@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/MemoryStream.h>
+#include <LibGfx/ImageFormats/ImageDecoder.h>
+
+namespace Gfx {
+
+// https://www.itu.int/itudoc/itu-t/com16/tiff-fx/docs/tiff6.pdf
+
+class TIFFLoadingContext;
+
+class TIFFImageDecoderPlugin : public ImageDecoderPlugin {
+public:
+    static bool sniff(ReadonlyBytes);
+    static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
+
+    virtual ~TIFFImageDecoderPlugin() override = default;
+
+    virtual IntSize size() override;
+
+    virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
+
+private:
+    TIFFImageDecoderPlugin(NonnullOwnPtr<FixedMemoryStream>);
+
+    OwnPtr<TIFFLoadingContext> m_context;
+};
+
+}