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LibGfx/TIFF: Add support for the IFD type

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As described in the first edition of the TIFF technical notes, the IFD
type is identical to Long (UnsignedLong) except that it only contains
offset of valid IFDs.

https://www.awaresystems.be/imaging/tiff/specification/TIFFPM6.pdf
This commit is contained in:
Lucas CHOLLET 2024-01-11 22:34:39 -05:00 • committed by Jelle Raaijmakers
commit 1d0a762cdb
Notes: sideshowbarker 2024-07-16 22:54:10 +09:00
3 changed files with 7 additions and 1 deletions
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1
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -468,6 +468,7 @@ private:
}
case Type::UnsignedShort:
return read_every_values.template operator()<u16>();
case Type::IFD:
case Type::UnsignedLong:
return read_every_values.template operator()<u32>();
case Type::UnsignedRational:

4
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.h
View file

@ -11,8 +11,12 @@
namespace Gfx {
// This is a link to the main TIFF specification from 1992
// https://www.itu.int/itudoc/itu-t/com16/tiff-fx/docs/tiff6.pdf
// First TIFF Technical notes from 1995
// https://www.awaresystems.be/imaging/tiff/specification/TIFFPM6.pdf
namespace TIFF {
class TIFFLoadingContext;
}

3
Userland/Libraries/LibGfx/TIFFGenerator.py
View file

@ -40,6 +40,7 @@ class TIFFType(EnumWithExportName):
SignedRational = 10, 8
Float = 11, 4
Double = 12, 8
IFD = 13, 4
UTF8 = 129, 1
@ -218,7 +219,7 @@ def tiff_type_to_cpp(t: TIFFType, with_promotion: bool = True) -> str:
return 'ByteBuffer'
if t == TIFFType.UnsignedShort:
return 'u16'
if t == TIFFType.UnsignedLong:
if t == TIFFType.UnsignedLong or t == TIFFType.IFD:
return 'u32'
if t == TIFFType.UnsignedRational:
return 'TIFF::Rational<u32>'