LibGfx/ISOBMFF: Add support for some of the JPEG XL boxes

Userland/Libraries/LibGfx/CMakeLists.txt

@@ -51,6 +51,7 @@ set(SOURCES
     ImageFormats/ImageDecoder.cpp
     ImageFormats/ISOBMFF/Boxes.cpp
     ImageFormats/ISOBMFF/JPEG2000Boxes.cpp
+    ImageFormats/ISOBMFF/JPEGXLBoxes.cpp
     ImageFormats/ISOBMFF/Reader.cpp
     ImageFormats/JBIG2Loader.cpp
     ImageFormats/JPEG2000Loader.cpp

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/Enums.h

@@ -20,6 +20,9 @@ namespace Gfx::ISOBMFF {
     ENUMERATE_ONE(JPEG2000ChannelDefinitionBox, "cdef")        \
     ENUMERATE_ONE(JPEG2000ComponentMappingBox, "cmap")         \
     ENUMERATE_ONE(JPEG2000ColorSpecificationBox, "colr")       \
+    ENUMERATE_ONE(JPEGXLCodestreamBox, "jxlc")                 \
+    ENUMERATE_ONE(JPEGXLLevelBox, "jxll")                      \
+    ENUMERATE_ONE(JPEGXLSignatureBox, "JXL ")                  \
     ENUMERATE_ONE(FreeBox, "free")                             \
     ENUMERATE_ONE(FileTypeBox, "ftyp")                         \
     ENUMERATE_ONE(JPEG2000ImageHeaderBox, "ihdr")              \

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/JPEGXLBoxes.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025, Lucas Chollet <[email protected]>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "JPEGXLBoxes.h"
+
+namespace Gfx::ISOBMFF {
+
+ErrorOr<void> JPEGXLSignatureBox::read_from_stream(ConstrainedStream& stream)
+{
+    // FIXME: Make the decoder check the signature.
+    TRY(stream.discard(4));
+    return {};
+}
+
+void JPEGXLSignatureBox::dump(String const& prepend) const
+{
+    Box::dump(prepend);
+}
+
+ErrorOr<void> JPEGXLLevelBox::read_from_stream(ConstrainedStream& stream)
+{
+    level = TRY(stream.read_value<u8>());
+    return {};
+}
+
+void JPEGXLLevelBox::dump(String const& prepend) const
+{
+    Box::dump(prepend);
+    outln("{}- level = {}", prepend, level);
+}
+
+ErrorOr<void> JPEGXLCodestreamBox::read_from_stream(ConstrainedStream& stream)
+{
+    // FIXME: Prevent the copy.
+    TRY(codestream.try_resize(stream.remaining()));
+    TRY(stream.read_until_filled(codestream.span()));
+    return {};
+}
+
+void JPEGXLCodestreamBox::dump(String const& prepend) const
+{
+    Box::dump(prepend);
+    outln("{}- size = {}", prepend, codestream.size());
+}
+
+}

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/JPEGXLBoxes.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025, Lucas Chollet <[email protected]>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include "Boxes.h"
+
+namespace Gfx::ISOBMFF {
+
+// 18181-2 Information technology — JPEG XL image coding system
+// Part 2: File format
+
+// 9.1  JPEG XL Signature box (JXL␣)
+struct JPEGXLSignatureBox final : public Box {
+    BOX_SUBTYPE(JPEGXLSignatureBox);
+};
+
+// 9.3  Level box (jxll)
+struct JPEGXLLevelBox final : public Box {
+    BOX_SUBTYPE(JPEGXLLevelBox);
+
+    u8 level { 0 };
+};
+
+// 9.9  JPEG XL Codestream box (jxlc)
+struct JPEGXLCodestreamBox final : public Box {
+    BOX_SUBTYPE(JPEGXLCodestreamBox);
+
+    Vector<u8> codestream;
+};
+
+}

Userland/Libraries/LibGfx/ImageFormats/ISOBMFF/Reader.cpp

@@ -6,6 +6,7 @@
 
 #include "Reader.h"
 #include "JPEG2000Boxes.h"
+#include "JPEGXLBoxes.h"
 #include <AK/Function.h>
 
 namespace Gfx::ISOBMFF {
@@ -35,6 +36,12 @@ ErrorOr<BoxList> Reader::read_entire_file()
             return TRY(JPEG2000SignatureBox::create_from_stream(stream));
         case BoxType::JPEG2000UUIDInfoBox:
             return TRY(JPEG2000UUIDInfoBox::create_from_stream(stream));
+        case BoxType::JPEGXLCodestreamBox:
+            return TRY(JPEGXLCodestreamBox::create_from_stream(stream));
+        case BoxType::JPEGXLLevelBox:
+            return TRY(JPEGXLLevelBox::create_from_stream(stream));
+        case BoxType::JPEGXLSignatureBox:
+            return TRY(JPEGXLSignatureBox::create_from_stream(stream));
         case BoxType::UserExtensionBox:
             return TRY(UserExtensionBox::create_from_stream(stream));
         default: