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LibGfx/WebPWriter: Add a comment explaining a file offset

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Nico Weber 2024-05-27 20:21:14 -04:00 committed by Sam Atkins
parent b8d18ebcf7
commit c71b9fe6f8
1 changed files with 6 additions and 0 deletions
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6
Userland/Libraries/LibGfx/ImageFormats/WebPWriter.cpp
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@ -352,6 +352,12 @@ ErrorOr<void> WebPAnimationWriter::set_alpha_bit_in_header()
m_vp8x_flags |= 0x10;
auto current_offset = TRY(m_stream.tell());
// 4 bytes for "RIFF",
// 4 bytes RIFF chunk size (i.e. file size - 8),
// 4 bytes for "WEBP",
// 4 bytes for "VP8X",
// 4 bytes for VP8X chunk size,
// followed by VP8X flags in the first byte of the VP8X chunk data.
TRY(m_stream.seek(20, SeekMode::SetPosition));
TRY(m_stream.write_value<u8>(m_vp8x_flags));
TRY(m_stream.seek(current_offset, SeekMode::SetPosition));