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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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12
Userland/Libraries/LibGfx/TIFFGenerator.py
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@ -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;
"""