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LibGfx/TIFF: Explore underlying Image File Directories

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Every TIFF containers is composed of a main IFD. Some entries of this
one can be a pointer to a sub-IFD. We are now capable of exploring these
underlying structures. Note that we don't do anything with them yet.
This commit is contained in:
Lucas CHOLLET 2024-02-03 16:34:31 -05:00 • committed by Andrew Kaster
parent 4a7236cabf
commit a43793ee0d
2 changed files with 19 additions and 4 deletions
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11
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
View file

@ -453,7 +453,6 @@ private:
m_next_ifd = Optional<u32> { next_block_position };
else
m_next_ifd = OptionalNone {};
dbgln_if(TIFF_DEBUG, "Setting image file directory pointer to {}", m_next_ifd);
return {};
}
@ -491,6 +490,8 @@ private:
if (!m_next_ifd.has_value())
return Error::from_string_literal("TIFFImageDecoderPlugin: Missing an Image File Directory");
dbgln_if(TIFF_DEBUG, "Reading image file directory at offset {}", m_next_ifd);
TRY(m_stream->seek(m_next_ifd.value()));
auto const number_of_field = TRY(read_value<u16>());
@ -597,7 +598,13 @@ private:
return read_tiff_value(type, count, offset);
}()));
TRY(handle_tag(m_metadata, tag, type, count, move(tiff_value)));
auto subifd_handler = [&](u32 ifd_offset) -> ErrorOr<void> {
m_next_ifd = ifd_offset;
TRY(read_next_image_file_directory());
return {};
};
TRY(handle_tag(move(subifd_handler), m_metadata, tag, type, count, move(tiff_value)));
return {};
}

12
Userland/Libraries/LibGfx/TIFFGenerator.py
View file

@ -148,8 +148,9 @@ known_tags: List[Tag] = [
Tag('34675', [TIFFType.Undefined], [], None, "ICCProfile"),
]
HANDLE_TAG_SIGNATURE_TEMPLATE = ("ErrorOr<void> {namespace}handle_tag(ExifMetadata& metadata, u16 tag,"
" {namespace}Type type, u32 count, Vector<{namespace}Value>&& value)")
HANDLE_TAG_SIGNATURE_TEMPLATE = ("ErrorOr<void> {namespace}handle_tag(Function<ErrorOr<void>(u32)>&& subifd_handler, "
"ExifMetadata& metadata, u16 tag, {namespace}Type type, u32 count, "
"Vector<{namespace}Value>&& value)")
HANDLE_TAG_SIGNATURE = HANDLE_TAG_SIGNATURE_TEMPLATE.format(namespace="")
HANDLE_TAG_SIGNATURE_TIFF_NAMESPACE = HANDLE_TAG_SIGNATURE_TEMPLATE.format(namespace="TIFF::")
@ -478,6 +479,12 @@ def generate_tag_handler(tag: Tag) -> str:
}}
"""
handle_subifd = ''
if TIFFType.IFD in tag.types:
if tag.counts != [1]:
raise RuntimeError("Accessing `value[0]` in the C++ code might fail!")
handle_subifd = f'TRY(subifd_handler(value[0].get<{tiff_type_to_cpp(TIFFType.IFD)}>()));'
output = fR""" case {tag.id}:
// {tag.name}
@ -485,6 +492,7 @@ def generate_tag_handler(tag: Tag) -> str:
{pre_condition}
{check_value}
{handle_subifd}
metadata.add_entry("{tag.name}"sv, move(value));
break;
"""