LibGfx/JPEG2000: Skip TLM, PLM, PLT markers

These markers are just for more efficient access into the codestream.
We can just ignore them.

Here's an actual file using a PLT marker:
https://github.com/mozilla/pdf.js/files/6083044/njp.32101064480005_page_013.2.pdf

Rendering that file now fails later (due to unsupported code block
styles).

I haven't found a way to to create a file with a PLM marker. The TLM and
PLT inputs were created by running:

    ../openjpeg/build/bin/opj_compress -i ref.bmp \
        -o openjpeg-lossless-rgba-u8-TLM.jp2 \
        -TLM \
        -C "opj_compress -TLM"

    ../openjpeg/build/bin/opj_compress -i ref.bmp \
        -o openjpeg-lossless-rgba-u8-PLT.jp2 \
        -PLT \
        -C "opj_compress -PLT"

Author: nico

Tests/LibGfx/TestImageDecoder.cpp

@@ -699,6 +699,8 @@ TEST_CASE(test_jpeg2000_decode)
         TEST_INPUT("jpeg2000/openjpeg-lossless-rgba-u8-prog0-SOP.jp2"sv),
         TEST_INPUT("jpeg2000/openjpeg-lossless-rgba-u8-prog0-EPH.jp2"sv),
         TEST_INPUT("jpeg2000/openjpeg-lossless-rgba-u8-prog0-EPH-SOP.jp2"sv),
+        TEST_INPUT("jpeg2000/openjpeg-lossless-rgba-u8-PLT.jp2"sv),
+        TEST_INPUT("jpeg2000/openjpeg-lossless-rgba-u8-TLM.jp2"sv),
     };
 
     for (auto test_input : test_inputs) {

Tests/LibGfx/test-inputs/jpeg2000/openjpeg-lossless-rgba-u8-PLT.jp2

@@ -966,6 +966,10 @@ static ErrorOr<void> parse_codestream_main_header(JPEG2000LoadingContext& contex
                 context.qccs.append(TRY(read_quantization_component(marker.data.value(), context.siz.components.size())));
             } else if (marker.marker == J2K_COM) {
                 context.coms.append(TRY(read_comment(marker.data.value())));
+            } else if (marker.marker == J2K_TLM) {
+                // TLM describes tile-part lengths, for random access. They can be ignored for now.
+            } else if (marker.marker == J2K_PLM) {
+                // PLM describes packet lengths, for random access. They can be ignored for now.
             } else {
                 // FIXME: These are valid main header markers. Parse contents.
                 dbgln("JPEG2000ImageDecoderPlugin: marker {:#04x} not yet implemented", marker.marker);
@@ -1057,6 +1061,8 @@ static ErrorOr<void> parse_codestream_tile_header(JPEG2000LoadingContext& contex
                 tile.qccs.append(TRY(read_quantization_component(marker.data.value(), context.siz.components.size())));
             } else if (marker.marker == J2K_COM) {
                 tile_part.coms.append(TRY(read_comment(marker.data.value())));
+            } else if (marker.marker == J2K_PLT) {
+                // PLT describes packet lengths, for random access. They can be ignored for now.
             } else {
                 // FIXME: These are valid main header markers. Parse contents.
                 dbgln("JPEG2000ImageDecoderPlugin: marker {:#04x} not yet implemented in tile header", marker.marker);