- Update to version 1.5.1
+ Fix for PowerPC platforms lacking AltiVec instructions
+ Fix ABI problem with clang/llvm on aarch64.
+ Fancy upsampling is now supported when decompressing JPEG
images that use 4:4:0 (h1v2) chroma subsampling.
+ If merged upsampling isn't SIMD-accelerated but YCbCr-to-RGB
conversion is, then libjpeg-turbo will now disable merged
upsampling when decompressing YCbCr JPEG images into RGB
or extended RGB output images. This significantly speeds up
the decompression of 4:2:0 and 4:2:2 JPEGs on ARM platforms
if fancy upsampling is not used
(for example, if the -nosmooth option to djpeg is specified.)
+ The TurboJPEG API will now decompress 4:2:2 and 4:4:0 JPEG
images with 2x2 luminance sampling factors and 2x1 or 1x2
chrominance sampling factors.
+ Fixed an unsigned integer overflow in the libjpeg memory manager.
+ Fixed additional negative left shifts and other issues reported
by the GCC and Clang undefined behavior sanitizers when
attempting to decompress specially-crafted malformed JPEG
images. None of these issues posed a security threat, but
removing the warnings makes it easier to detect actual
security issues, should they arise in the future.
+ Fixed an out-of-bounds array reference, introduced by
1.4.902 and detected by the Clang undefined behavior sanitizer,
that could be triggered by a specially-crafted malformed
JPEG image with more than four components. Because the
out-of-bounds reference was still within the same structure,
it was not known to pose a security threat, but removing
the warning makes it easier to detect actual security issues,
should they arise in the future.