kc3-lang/libjpeg-turbo

Log

Author Commit Date CI Message
DRC bf01ed2f 2022-11-04T13:08:08 Fix build when SIMD extensions are disabled (Broken by previous commit)
DRC e8b40f3c 2022-11-01T21:45:39 Vastly improve 12-bit JPEG integration The Gordian knot that 7fec5074f962b20ed00b4f5da4533e1e8d4ed8ac attempted to unravel was caused by the fact that there are several data-precision-dependent (JSAMPLE-dependent) fields and methods in the exposed libjpeg API structures, and if you change the exposed libjpeg API structures, then you have to change the whole API. If you change the whole API, then you have to provide a whole new library to support the new API, and that makes it difficult to support multiple data precisions in the same application. (It is not impossible, as example.c demonstrated, but using data-precision-dependent libjpeg API structures would have made the cjpeg, djpeg, and jpegtran source code hard to read, so it made more sense to build, install, and package 12-bit-specific versions of those applications.) Unfortunately, the result of that initial integration effort was an unreadable and unmaintainable mess, which is a problem for a library that is an ISO/ITU-T reference implementation. Also, as I dug into the problem of lossless JPEG support, I realized that 16-bit lossless JPEG images are a thing, and supporting yet another version of the libjpeg API just for those images is untenable. In fact, however, the touch points for JSAMPLE in the exposed libjpeg API structures are minimal: - The colormap and sample_range_limit fields in jpeg_decompress_struct - The alloc_sarray() and access_virt_sarray() methods in jpeg_memory_mgr - jpeg_write_scanlines() and jpeg_write_raw_data() - jpeg_read_scanlines() and jpeg_read_raw_data() - jpeg_skip_scanlines() and jpeg_crop_scanline() (This is subtle, but both of those functions use JSAMPLE-dependent opaque structures behind the scenes.) It is much more readable and maintainable to provide 12-bit-specific versions of those six top-level API functions and to document that the aforementioned methods and fields must be type-cast when using 12-bit samples. Since that eliminates the need to provide a 12-bit-specific version of the exposed libjpeg API structures, we can: - Compile only the precision-dependent libjpeg modules (the coefficient buffer controllers, the colorspace converters, the DCT/IDCT managers, the main buffer controllers, the preprocessing and postprocessing controller, the downsampler and upsamplers, the quantizers, the integer DCT methods, and the IDCT methods) for multiple data precisions. - Introduce 12-bit-specific methods into the various internal structures defined in jpegint.h. - Create precision-independent data type, macro, method, field, and function names that are prefixed by an underscore, and use an internal header to convert those into precision-dependent data type, macro, method, field, and function names, based on the value of BITS_IN_JSAMPLE, when compiling the precision-dependent libjpeg modules. - Expose precision-dependent jinit*() functions for each of the precision-dependent libjpeg modules. - Abstract the precision-dependent libjpeg modules by calling the appropriate precision-dependent jinit*() function, based on the value of cinfo->data_precision, from top-level libjpeg API functions.
DRC 6c2bc901 2022-11-03T14:39:19 Don't allow disabling in-memory src/dest managers By default, libjpeg-turbo 1.3.x and later have enabled the in-memory source/destination manager functions from libjpeg v8 when emulating the libjpeg v6b or v7 API/ABI, which has allowed operating system distributors to provide those functions without adopting the backward-incompatible libjpeg v8 API/ABI. Prior to libjpeg-turbo 1.5.x, it made sense to allow users to disable the in-memory source/destination manager functions at build time and thus retain both backward and forward API/ABI compatibility relative to libjpeg v6b or v7. Since then, however, we have introduced several new libjpeg API functions that break forward API/ABI compatibility, so it no longer makes sense to allow the in-memory source/destination managers to be disabled. libjpeg-turbo only claims to be backward-API/ABI-compatible, i.e. to allow applications built against libjpeg or an older version of libjpeg-turbo to work properly with the current version of libjpeg-turbo.
DRC 664b64a9 2022-11-03T14:25:35 Merge branch 'main' into dev
DRC 4f7a8afb 2022-11-03T13:37:55 Build: Fix issues w/ Ninja Multi-Config generator - Fix an issue whereby a build with ENABLE_SHARED=0 could not be installed when using the Ninja Multi-Config CMake generator. - Fix an issue whereby a Windows installer could not be built when using the Ninja Multi-Config CMake generator. - Fix an issue whereby the Java regression tests failed when using the Ninja Multi-Config CMake generator. Based on: https://github.com/stilllman/libjpeg-turbo/commit/4f169deeb092a0513472b04f05f57bfe42b31ceb Closes #626
DRC 8c5e78ce 2022-11-03T11:22:50 Build: Document SO_AGE and TURBOJPEG_SO_AGE vars
DRC 8917c548 2022-11-03T14:20:22 ChangeLog.md: Add colons to sub-headers For some reason, I failed to add a colon to the "Significant changes relative to 2.1 beta1" sub-header, and the mistake propagated from there.
DRC cb3642cb 2022-11-03T12:22:51 Bump version to 2.1.5 to prepare for new commits
DRC 4d269d7c 2022-10-21T12:22:28 Merge branch 'main' into dev
DRC 51f1924e 2022-10-21T11:36:29 wizard.txt: Clarify scan script restrictions The Wallace paper is not entirely clear on these restrictions, and the spec itself requires some digging. Closes #624
DRC 5acd9f20 2022-10-04T12:58:11 Merge branch 'main' into dev
DRC eb0a024a 2022-10-04T12:51:38 Remove redundant jconfigint.h #includes Because of 607b668ff96e40fdc749de9b1bb98e7f40c86d93, jconfigint.h is included by jinclude.h.
DRC 543bfc25 2022-10-03T21:38:15 Merge branch 'main' into dev
DRC f579cc11 2022-10-03T19:46:09 Make SIMD capability variables thread-local ... ... on platforms that support TLS, which should include all currently-supported platforms (https://libjpeg-turbo.org/Documentation/OfficialBinaries) Addresses a concern raised in #87 Although it is still my opinion that the data race in init_simd() was innocuous, we can now fix it for free thanks to ae87a958613b69628b92088b313ded0d4f59a716, so why not?
DRC 2fd634b8 2022-09-12T23:36:34 Merge branch 'main' into dev
DRC 2cad2169 2022-09-12T21:54:35 BUILDING.md: Acknowledge RHEL 9
DRC b3d3cbf4 2022-09-12T14:41:34 JNI: Remove deprecated methods (oversight from 931884e78dc8777e6477451e984af8b263e450b1)
DRC fdfba495 2022-09-02T15:11:25 Merge branch 'main' into dev
DRC c5db99e1 2022-09-02T14:48:58 GitHub Actions: Specify Big Sur for macOS build The Catalina hosted runner is now fully deprecated.
DRC 513f9e66 2022-08-09T04:27:33 Merge branch 'main' into dev
DRC 8162eddf 2022-08-08T16:02:34 Fix issues w/ partial img decompr + buf img mode Fixes #611
DRC 931884e7 2022-08-08T15:41:01 Java: Remove deprecated fields, ctors, and methods Most of these have been deprecated since libjpeg-turbo 1.4.x. It's time.
DRC 280784f7 2022-08-08T15:07:45 Merge branch 'main' into dev
DRC 2e136a71 2022-08-08T14:17:51 Re-fix buf img mode decompr err w/short prog JPEGs This commit reverts 4dbc293125b417f97e5b1ca9e7260c82ff199a06 and 9f8f683e745972720433406cff4b31e95bd6a33e (the previous two commits) and fixes #613 the correct way. The crux of the issue wasn't the size of the whole_image virtual array but rather that, since last_iMCU_row is unsigned, (last_iMCU_row - 1) wrapped around to 0xFFFFFFFF when last_iMCU_row was 0. This caused the interblock smoothing algorithm introduced in 6d91e950c871103a11bac2f10c63bf998796c719 to erroneously try to access the next two iMCU rows, neither of which existed. The first attempt at a fix (4dbc293125b417f97e5b1ca9e7260c82ff199a06) exposed a NULL dereference, detected by OSS-Fuzz, that occurred when attempting to decompress a specially-crafted malformed JPEG image to a YUV buffer using tjDecompressToYUV*() with 1/4 IDCT scaling. Fixes #613 (again) Also fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=49898
DRC f6273192 2022-08-07T14:16:28 Merge branch 'main' into dev
DRC 9f8f683e 2022-08-07T14:15:03 jdcoefct.c: Fix signed/unsigned mismatch VC++ wrng (introduced by previous commit)
DRC 9a60181b 2022-08-07T13:48:31 Merge branch 'main' into dev
DRC 4dbc2931 2022-08-07T09:24:57 Fix buf image mode decompr err w/ short prog JPEGs Regression introduced by 6d91e950c871103a11bac2f10c63bf998796c719 Because we're now using a 5x5 smoothing window when decompressing progressive JPEG images, we need to ensure that the whole_image virtual array contains at least five rows. Previously that was not always the case unless the progressive JPEG image being decompressed had at least five iMCU rows. Since an iMCU has a height of (8 * the vertical sampling factor), attempting to decompress 4:2:2 and 4:4:4 images <= 32 pixels in height or 4:2:0 images <= 64 pixels in height triggered a JERR_BAD_VIRTUAL_ACCESS error in decompress_smooth_data(), because access_rows exceeded the number of rows in the virtual array. Fixes #613
DRC fc224c48 2022-07-07T13:11:05 Merge branch 'main' into dev
Donovan Watteau 59337a67 2022-07-06T12:11:50 PowerPC: Detect AltiVec support on OS X libjpeg-turbo's AltiVec SIMD extensions previously assumed that AltiVec instructions were available on all Power Macs that supported OS X 10.4 "Tiger" (the earliest version of OS X that libjpeg-turbo has ever supported), but Tiger can actually run on PowerPC G3 processors, which lack AltiVec instructions. This commit enables run-time detection of AltiVec instructions on OS X/PowerPC systems if AltiVec instructions are not force-enabled at compile time (using -maltivec). This allows the same build of libjpeg-turbo to support G3, G4, and G5 Power Macs. Closes #609
DRC 8a3b0f70 2022-06-24T15:21:51 Implement 12-bit-specific error/warn/trace macros The macros in jerror.h refer to j_common_ptr, so it is unfortunately necessary to introduce a 12-bit-specific version of that header file (j12error.h) with 12-bit specific ERREXIT*(), WARNMS*(), and TRACEMS*() macros. (The message table is still shared between 8-bit and 12-bit implementations.) Fixes #607
DRC aa5a3599 2022-06-24T14:21:33 Merge branch 'main' into dev
DRC ba22c0f7 2022-06-24T14:03:03 tjDecompressHeader3(): Accept tables-only streams Inspired by: https://github.com/amyspark/libjpeg-turbo/commit/b3b15cfe74cf07914122e26cf1e408a9a9cf3135 Closes #604 Closes #605
DRC 225781af 2022-06-14T14:25:11 jchuff.c: Clean up aadd60ae + add code comments Based on: https://github.com/fhanau/libjpeg-turbo/commit/4d73f52032a608262f8b286dd4584836ddc73180 https://github.com/fhanau/libjpeg-turbo/commit/184f10703eeb214177b02f88939af237267a8d66 Refer to #602
DRC faa7c74a 2022-05-31T13:07:00 ChangeLog.md: Acknowledge 2.1.4 release
Felix Hanau aadd60ae 2022-05-25T19:51:52 Speed up computation of optimal Huffman tables Closes #602
DRC 0000dadf 2022-05-27T12:15:04 Merge branch 'main' into dev
DRC a405519e 2022-05-27T11:59:56 Fix build if UPSAMPLE_MERGING_SUPPORTED undefined Although it is uncommon, some downstream implementations undefine one or more of the *_SUPPORTED macros in jmorecfg.h in order to reduce the size of the library. In the interest of maintaining backward compatibility with libjpeg, this is still a supported use case. Regression introduced by 9120a247436e84c0b4eea828cb11e8f665fcde30 Based on: https://github.com/fhanau/libjpeg-turbo/commit/74c4d032f0448edb0c8898b6e096123ae1aa093f Closes #601
Jiaxun Yang fac83814 2022-05-14T14:34:43 Build: Don't enable Loongson MMI with MIPS R6+ MIPS R6 removed some instructions, so Loongson MMI cannot be built with MIPS R6+ toolchains. Closes #598
DRC 0f5d31e6 2022-04-28T20:04:53 Merge branch 'main' into dev
modbw 290ddbf7 2022-04-22T08:30:21 MinGW: Fix str*casecmp() macro redef. warning MinGW defines strcasecmp() and strncasecmp() as macros in string.h if __CRT__NO_INLINE is defined, which will be the case when including any of the Win32 API headers. Closes #594
DRC b98dabac 2022-04-27T12:38:58 Merge branch 'main' into dev
DRC 9171fd4b 2022-04-26T10:42:35 OSS-Fuzz: '.' --> '_' in fuzzer suffix Referring to https://github.com/google/oss-fuzz/issues/7575, if the fuzzer suffix contains periods, it can cause ClusterFuzz to misinterpret the file extension of the fuzzer executables and thus misidentify them.
DRC d0e7c454 2022-04-18T11:34:07 Don't install libturbojpeg.pc if WITH_TURBOJPEG=0 Fixes #593
Alex Richardson dfc63d42 2022-03-28T22:30:54 Fix non-SIMD alignment if void* bigger than double When building without the SIMD extensions, memory allocations are currently aligned to sizeof(double). However, this may be insufficient on architectures such as Arm Morello or 64-bit CHERI-RISC-V where pointers require 16-byte rather than 8-byte alignment. This patch causes memory allocations to be aligned to MAX(sizeof(void *), sizeof(double)) when building without the SIMD extensions. (NOTE: With C11 we could instead use alignof(max_align_t), but C89 compatibility is still necessary in libjpeg-turbo.) Closes #587
DRC 82081337 2022-04-06T11:16:09 Merge branch 'main' into dev
DRC 67cb0590 2022-04-06T10:50:33 OSS-Fuzz: Allow fuzzer suffix to be specified This facilitates fuzzing multiple branches of the code.
DRC 5c8cac97 2022-04-06T10:51:58 CI: Un-integrate CIFuzz Referring to the conversation in https://github.com/google/oss-fuzz/issues/7479 and #559, there was a misunderstanding regarding how CIFuzz works. It cannot be used to fuzz arbitrary PRs or code branches, and it has a 90-day delay in downloading corpora from OSS-Fuzz. That makes it unsuitable for libjpeg-turbo.
DRC 89a369de 2022-03-31T10:33:26 Merge branch 'main' into dev
DRC df3c3dcb 2022-03-31T10:22:06 BUILDING.md: Generify PowerTools repo advice This advice applies to CentOS Stream as well as to popular CentOS 8 replacements, such as Rocky Linux and AlmaLinux.
DRC 1b9edb5c 2022-03-10T23:57:11 Build: Fix 12-bit FP tests w/ 32-bit builds With x86-64 builds, the default value of FLOATTEST works with both the 8-bit-per-sample and 12-bit-per-sample flavors of the libjpeg API library. However, that is not the case with x86 builds. Thus, we need separate 8-bit-per-sample and 12-bit-per-sample FLOATTEST variables.
DRC cb715fe1 2022-03-11T17:12:37 example.c: Fix compiler warning with GCC 4.4.7
DRC ebd19302 2022-03-10T23:21:55 GitHub Actions: "linux-12bit" --> "linux-no12bit" This job tests the non-default value of WITH_12BIT, which is now 0 instead of 1.
DRC 263386c2 2022-03-11T17:35:59 Merge branch 'main' into dev
DRC 2ee7264d 2022-03-11T17:28:36 Build: Don't set DEFAULT_FLOATTEST for x86 MSVC Newer versions of the 32-bit x86 Visual Studio compiler produce results compatible with FLOATTEST=no-fp-contract, so we can no longer intelligently set a default FLOATTEST value for that platform.
DRC 30cba2a2 2022-03-11T11:49:34 Build/Win: Fix CMake warning when WITH_TURBOJPEG=0 When 12-bit-per-component JPEG support is enabled (WITH_12BIT=1) or the TurboJPEG API library and associated test programs are disabled (WITH_TURBOJPEG=0), the Windows installer target should not depend on the turbojpeg, turbojpeg-static, and tjbench targets.
DRC a0148454 2022-03-11T10:50:47 Win: Fix build with Visual Studio 2010 (broken by 607b668ff96e40fdc749de9b1bb98e7f40c86d93) - Visual Studio 2010 apparently doesn't have the snprintf() inline function, so restore the macro that emulates that function using _snprintf_s(). - Explicitly include errno.h in strtest.c, since jinclude.h doesn't include it when building with Visual Studio.
DRC b3ae7779 2022-03-10T23:13:43 Fix in-tree builds (oops)
DRC a32038e3 2022-03-10T23:10:12 Fix formatting issues detected by checkstyle
DRC 7fec5074 2022-03-08T12:34:11 Support 8-bit & 12-bit JPEGs using the same build Partially implements #199 This commit also implements a request from #178 (the ability to compile the libjpeg example as a standalone program.)
DRC fc562d11 2022-03-07T14:29:37 Bump version to 2.2 alpha1 ... ... to prepare for new features
DRC f3c716a2 2022-03-10T22:31:20 Link Sponsor button to GitHub Sponsors ... ... instead of PayPal.
DRC 6f1534d6 2022-03-09T12:58:17 example.txt: Fix a typo
DRC 9abeff46 2022-03-09T11:48:30 Remove extraneous #include directives jinclude.h already includes stdio.h, stdlib.h, and string.h.
DRC 932b5bb0 2022-03-09T10:50:51 IJG dox: Wordsmithing and formatting tweaks - Remove the section in libjpeg.txt that advised against building libjpeg as a shared library. We obviously do not follow that advice, and libjpeg-turbo does guarantee backward ABI compatibility in our libjpeg API library, even though libjpeg did not and does not. (Future expansion of our libjpeg API library, if necessary, will be accomplished using get/set functions that store the new parameters in the opaque master structs. Refer to https://github.com/mozilla/mozjpeg/commit/db2986c96fcebe10c8700081578e5305fd7bc7dc.) - Unmention install.txt, which was never relevant to libjpeg-turbo and was removed in v1.3 (6f96153c67e9a88775b457f998fc7fdd64c62cee). - Remove extraneous spaces. - Document the fact that TWO_FILE_COMMANDLINE must be defined in order to use the two-file interface with cjpeg, djpeg, jpegtran, and wrjpgcom. libjpeg-turbo never enables that interface by default.
DRC fdab4a7a 2022-03-08T17:25:57 Progs: Eliminate obsolete Mac ccommand() interface ccommand() was a 1990s-vintage hack for running console applications without a console. It doesn't exist in any modern macOS compiler.
DRC 05655481 2022-02-28T20:41:56 BUILDING.md: Mention sub-project best practices People keep trying to include libjpeg-turbo into downstream CMake-based build systems by way of the add_subdirectory() function and requesting upstream support when something inevitably breaks. (Refer to: #122, #173, #176, #202, #241, #349, #353, #412, #504, https://github.com/libjpeg-turbo/libjpeg-turbo/commit/a3d4aadd0d1597ad46edcbe3b964499ec785d40c#commitcomment-67575889). libjpeg-turbo has never supported that method of sub-project integration, because doing so would require that we (minimally): 1. avoid using certain CMake variables, such as CMAKE_SOURCE_DIR, CMAKE_BINARY_DIR, and CMAKE_PROJECT_NAME; 2. avoid using implicit include directories and relative paths; 3. provide a way to optionally skip the installation of libjpeg-turbo components in response to 'make install'; 4. provide a way to optionally postfix target names, to avoid namespace conflicts; 5. restructure the top-level CMakeLists.txt so that it properly sets the PROJECT_VERSION variable; and 6. design automated CI tests to ensure that new commits don't break any of the above. Even if we did all of that, issues would still arise, because it is impossible for one upstream build system to anticipate the widely varying needs of every downstream build system. That's why the CMake ExternalProject_Add() function exists, and it is my sincere hope that adding a blurb to BUILDING.md mentioning the need to use that function will head off future GitHub issues on this topic. If not, then I can at least post a link to this commit and the blurb and avoid doing the same song and dance over and over again.
Jonathan Wright c5f269eb 2021-09-03T11:52:40 Neon/AArch64: Explicitly unroll quant loop w/Clang The loop in jsimd_quantize_neon() is only executed twice and should be unrolled for AArch64 targets. GCC does that by default, but Clang 11 and later versions available at the time of this writing do not. This patch adds an unroll pragma when targetting AArch64 with Clang. We do not use the unroll pragma for AArch32 targets, because it causes the Clang-generated assembly code to exhaust the available Neon registers (32 x 64-bit) and spill to the stack. (DRC: Referring to the discussion in #570, this is likely due to compiler confusion that results in poor register allocation. It is possible to eliminate the spillage and reduce the instruction count by loading the data on a just-in-time basis, thus explicitly interleaving compute and I/O, but the performance implications of that are currently unknown.) The effects of unrolling the quantization loop are: 1) elimination of the loop control flow overhead and 2) enabling the use of LDP/STP instructions that work from a single base pointer, instead of using double the number of LDR/STR instructions, each requiring an address calculation. Closes #570
DRC 98bc3eeb 2022-02-24T23:09:58 Neon/AArch64: Fix/suppress UBSan warnings - Suppress a UBSan warning regarding storing a 64-bit value to a non-64-bit-aligned address. That behavior is technically undefined per the C spec but is supported in the context of the AArch64 architecture and compilers. - Explicitly promote block_diff[i] to unsigned int prior to left shifting it, in order to avoid a UBSan warning. This warning also described behavior that is technically undefined per the C spec but is supported in the context of the AArch64 architecture and compilers. Changing the type cast order eliminated the warning without changing the generated assembly code. Closes #582
Jonathan Wright 147548c0 2021-09-06T11:31:37 Neon/AArch64: Accelerate Huffman encoding - Make better use of 128-bit vector registers, thus reducing the number of Neon instructions required to construct the AC coefficient bitmap. - Refactor the Neon computations of 'nbits' and 'diff' to use shorter and higher-throughput instruction sequences. DRC's notes: This commit partially integrates #570. Arm reported a 1-4% speedup on Cortex-A55 and Neoverse-N1 cores when using recent compilers but little or no speedup with Clang 10. I observed no speedup with Clang 10 on my Cortex-A53 and Cortex-A72 cores. Thus, referring to #582, the primary purpose of this commit is to fix UBSan warnings regarding the shift operations previously located at Line 253: https://github.com/libjpeg-turbo/libjpeg-turbo/blob/d640a457305164417a60f30c6457d316f0b44a9d/simd/arm/aarch64/jchuff-neon.c#L253
DRC d640a457 2022-02-11T14:12:25 AppVeyor: Test strict MSVC compiler warnings
DRC eb21c023 2022-02-22T14:01:07 Eliminate incompatible pointer type warnings (C4057 in MSVC and -Wincompatible-pointer-types in GCC/Clang)
DRC 13377e6b 2022-02-11T13:58:31 MSVC: Eliminate int conversion warnings (C4244)
DRC 607b668f 2022-02-10T11:33:49 MSVC: Eliminate C4996 warnings in API libs The primary purpose of this is to encourage adoption of libjpeg-turbo in downstream Windows projects that forbid the use of "deprecated" functions. libjpeg-turbo's usage of those functions was not actually unsafe, because: - libjpeg-turbo always checks the return value of fopen() and ensures that a NULL filename can never be passed to it. - libjpeg-turbo always checks the return value of getenv() and never passes a NULL argument to it. - The sprintf() calls in format_message() (jerror.c) could never overflow the destination string buffer or leave it unterminated as long as the buffer was at least JMSG_LENGTH_MAX bytes in length, as instructed. (Regardless, this commit replaces those calls with snprintf() calls.) - libjpeg-turbo never uses sscanf() to read strings or multi-byte character arrays. - Because of b7d6e84d6a9283dc2bc50ef9fcaadc0cdeb25c9f, wrjpgcom explicitly checks the bounds of the source and destination strings before calling strcat() and strcpy(). - libjpeg-turbo always ensures that the destination string is terminated when using strncpy(). (548490fe5e2aa31cb00f6602d5a478b068b99682 made this explicit.) Regarding thread safety: Technically speaking, getenv() is not thread-safe, because the returned pointer may be invalidated if another thread sets the same environment variable between the time that the first thread calls getenv() and the time that that thread uses the return value. In practice, however, this could only occur with libjpeg-turbo if: (1) A multithreaded calling application used the deprecated and undocumented TJFLAG_FORCEMMX/TJFLAG_FORCESSE/TJFLAG_FORCESSE2 flags in the TurboJPEG API or set one of the corresponding environment variables (which are only intended for testing purposes.) Since the TurboJPEG API library only ever passed string constants to putenv(), the only inherent risk (i.e. the only risk introduced by the library and not the calling application) was that the SIMD extensions may have read an incorrect value from one of the aforementioned environment variables. or (2) A multithreaded calling application modified the value of the JPEGMEM environment variable in one thread while another thread was reading the value of that environment variable (in the body of jpeg_create_compress() or jpeg_create_decompress().) Given that the libjpeg API provides a thread-safe way for applications to modify the default memory limit without using the JPEGMEM environment variable, direct modification of that environment variable by calling applications is not supported. Microsoft's implementation of getenv_s() does not claim to be thread-safe either, so this commit uses getenv_s() solely to mollify Visual Studio. New inline functions and macros (GETENV_S() and PUTENV_S) wrap getenv_s()/_putenv_s() when building for Visual Studio and getenv()/setenv() otherwise, but GETENV_S()/PUTENV_S() provide no advantages over getenv()/setenv() other than parameter validation. They are implemented solely for convenience. Technically speaking, strerror() is not thread-safe, because the returned pointer may be invalidated if another thread changes the locale and/or calls strerror() between the time that the first thread calls strerror() and the time that that thread uses the return value. In practice, however, this could only occur with libjpeg-turbo if a multithreaded calling application encountered a file I/O error in tjLoadImage() or tjSaveImage(). Since both of those functions immediately copy the string returned from strerror() into a thread-local buffer, the risk is minimal, and the worst case would involve an incorrect error string being reported to the calling application. Regardless, this commit uses strerror_s() in the TurboJPEG API library when building for Visual Studio. Note that strerror_r() could have been used on Un*x systems, but it would have been necessary to handle both the POSIX and GNU implementations of that function and perform widespread compatibility testing. Such is left as an exercise for another day. Fixes #568
DRC ab6cae6f 2022-02-22T10:23:19 BUILDING.md: Clarify that Ninja works with Windows
DRC 3ccb6ead 2022-02-11T10:05:18 BUILDING.md: Remove NASM RPM rebuild instructions All currently supported Linux platforms now provide a recent enough version of either NASM or Yasm.
DRC 6441ad0f 2022-02-11T09:56:41 BUILDING.md: Document NASM/Yasm path variables This was an oversight from the CMake build system overhaul in libjpeg-turbo 2.0 (6abd39160c5a3762e9ebe024e75407665093e715). Closes #580
DRC 6d2d6d3b 2022-02-11T09:34:01 "YASM" = "Yasm" The assembler name was initially spelled "YASM", but it has been "Yasm" for the entirety of libjpeg-turbo's existence.
DRC e1588a2a 2022-02-10T22:23:26 Build: Fix Neon capability detection w/ MSVC (broken by 57ba02a408a9a55ccff25aae8b164632a3a4f177) Refer to #547
DRC 548490fe 2022-02-10T11:37:06 Ensure that strncpy() dest strings are terminated - Since the ERREXITS() and TRACEMSS() macros are never used internally (they are a relic of the legacy memory managers that libjpeg provided), the only risk was that an external program might have invoked one of those macros with a string longer than 79 characters (JMSG_STR_PARM_MAX - 1). - TJBench never invokes the THROW_TJ() macro with a string longer than 199 (JMSG_LENGTH_MAX - 1) characters, so there was no risk. However, it's a good idea to explicitly terminate the destination strings so that anyone looking at the code can immediately tell that it is safe.
DRC b579fc11 2022-02-07T15:27:50 Eliminate unnecessary JFREAD()/JFWRITE() macros
DRC a3d4aadd 2022-02-01T12:53:28 Build: Embed version/API/(C) info in MSVC DLLs Based on: https://github.com/TheDorkKnight/libjpeg-turbo/commit/da7a18801a5c305d3f8a71b065f179f1e22b73ae Closes #576
DRC d7d16df6 2022-02-01T09:11:19 Fix segv w/ h2v2 merged upsamp, jpeg_crop_scanline The h2v2 (4:2:0) merged upsampler uses a spare row buffer so that it can upsample two rows at a time but return only one row to the application, if necessary. merged_2v_upsample() copies from this spare row buffer into the application-supplied output buffer, using the out_row_width field in the my_merged_upsampler struct to determine how many samples to copy. out_row_width is set in jinit_merged_upsampler(), which is called within the body of jpeg_start_decompress(). Since jpeg_crop_scanline() must be called after jpeg_start_decompress(), jpeg_crop_scanline() must modify the value of out_row_width if the h2v2 merged upsampler will be used. Otherwise, merged_2v_upsample() can overflow the output buffer if the number of bytes between the current output buffer position and the end of the buffer is less than the number of bytes required to represent an uncropped scanline of the output image. All of the destination managers used by djpeg allocate either a whole image buffer or a scanline buffer based on the uncropped output image width, so this issue is not reproducible using djpeg. Fixes #574
DRC 14ce28a9 2022-01-29T12:33:40 TJBench: Remove innocuous always-true condition This was accidentally introduced into tjbench.c in 890f1e0413b54c40b663208779d4ea9dae20eaef and ported into the Java version from there. Based on https://github.com/libjpeg-turbo/libjpeg-turbo/pull/571/commits/4be6d4e7bdd09a73ee8456aa07693afa31ef2148 Refer to #571
DRC da41ab94 2022-01-06T12:57:26 GitHub Actions: Specify Catalina for macOS build macos-latest now maps to the Big Sur image, which doesn't have Xcode 12.2 installed.
DRC 1f55ae7b 2022-01-06T12:08:46 Fix -Wpedantic compiler warnings ... and test for those warnings (and others) when performing CI builds.
DRC 17297239 2022-01-06T09:17:30 Eliminate non-ANSI C compatibility macros libjpeg-turbo has never supported non-ANSI C compilers. Per the spec, ANSI C compilers must have locale.h, stddef.h, stdlib.h, memset(), memcpy(), unsigned char, and unsigned short. They must also handle undefined structures.
Dmitry Tsarevich a7f0244e 2022-01-06T02:21:10 turbojpeg.h: Parenthesize TJSCALED() dimension arg This ensures that, for example, TJSCALED(dim0 + dim1, sf) will evaluate to (((dim0 + dim1) * sf.num + sf.denom - 1) / sf.denom) rather than ((dim0 + (dim1 * sf.num) + sf.denom - 1) / sf.denom)
DRC a01857cf 2021-12-01T17:08:29 Build: Disallow NEON_INTRINSICS=0 if GAS is broken If NEON_INTRINSICS=0, then run the GAS sanity check from libjpeg-turbo 2.0.x and force-enable NEON_INTRINSICS if the test fails. This fixes the AArch32 build when using Clang 6.0 on Linux or the Clang toolchain in the Android NDK r15*-r16*. It also prevents users from manually disabling NEON_INTRINSICS if doing so would break the build (such as with Xcode 5.)
DRC 57ba02a4 2021-10-01T16:28:54 Build: Improve Neon capability detection - Use check_c_source_compiles() rather than check_symbol_exists() to detect the presence of vld1_s16_x3(), vld1_u16_x2(), and vld1q_u8_x4(). check_symbol_exists() is unreliable for detecting intrinsics, and in practice, it did not detect the presence of the aforementioned intrinsics in versions of GCC that support them. - Set DEFAULT_NEON_INTRINSICS=0 for GCC < 12, even if the aforementioned intrinsics are available. The AArch64 back end in GCC 10 and 11 supports the necessary intrinsics, but the GAS implementation is still faster when using those compilers. Fixes #547
DRC 8a9a6dd1 2021-12-01T09:02:36 Make incompatible feature errs more user-friendly - Use JERR_NOTIMPL ("Not implemented yet") rather than JERR_NOT_COMPILED ("Requested feature was omitted at compile time") to indicate that arithmetic coding is incompatible with Huffman table optimization. This is more consistent with other parts of the libjpeg API code. JERR_NOT_COMPILED is typically used to indicate that a major feature was not compiled in, whereas JERR_NOTIMPL is typically used to indicate that two features were compiled in but are incompatible with each other (such as, for instance, two-pass color quantization and partial image decompression.) - Change the text of JERR_NOTIMPL to "Requested features are incompatible". This is a more accurate description of the situation. "Not implemented yet" implies that it may be possible to support the requested combination of features in the future, but that is not true in most of the cases where JERR_NOTIMPL is used. Fixes #567
DRC 73eff6ef 2021-11-30T15:06:54 cjpeg: auto. compr. gray BMP/GIF-->grayscale JPEG aa7459050d7a50e1d8a99488902d41fbc118a50f was supposed to enable this for BMP input images but didn't, due to a similar oversight to the one fixed in the previous commit.
DRC 2ce32e0f 2021-11-30T10:54:24 cjpeg: automatically compress PGM-->grayscale JPEG (regression introduced by aa7459050d7a50e1d8a99488902d41fbc118a50f) cjpeg sets cinfo.in_color_space to JCS_RGB as an "arbitrary guess." Since tjLoadImage() never uses JCS_RGB, the PGM reader should treat JCS_RGB the same as JCS_UNKNOWN. Fixes #566
DRC e869a81a 2021-11-23T09:54:23 jdarith.c: Require cinfo->Se == DCTSIZE2 - 1 This fixes an oversight from the integration of the arithmetic entropy codec from libjpeg (66f97e6820e2cc9ef7429ea36285c80ffda87c8f). I chose to integrate the latest implementation available at the time, which was from jpeg-8b. However, I naively replaced cinfo->lim_Se with DCTSIZE2 - 1, not realizing that-- because of SmartScale-- jpeg-8b contains additional code (https://github.com/libjpeg-turbo/libjpeg-turbo/blob/jpeg-8b/jdinput.c#L249-L334) that guards against illegal values of cinfo->Se >= DCTSIZE2. Thus, libjpeg-turbo's implementation of arithmetic decoding has never guarded against such illegal values. This commit restores the relevant check from the original jpeg-6b arithmetic entropy codec patch ("jpeg-ari", 1e247ac854f8e33682bcfea475f6bccc42377208). Fixes #564
DRC 5446ff88 2021-11-19T13:43:36 CI: CIFuzz integration CIFuzz runs the project's fuzzers for a limited period of time any time a commit is pushed or a PR is submitted. This is not intended to replace OSS-Fuzz but rather to allow us to more quickly catch some fuzzing failures, including fuzzer build regressions like the one introduced in ecf021bc0d6f435daacff7c35ccaeef0145df1b9. Closes #559
DRC 0f88060b 2021-11-19T13:36:42 cjpeg.c: Fix fuzzer build failure (caused by previous commit)
DRC ecf021bc 2021-11-18T21:04:35 cjpeg: Add -strict arg to treat warnings as fatal This adds fault tolerance to the LZW-compressed GIF reader, which is the only compression-side code that can throw warnings.
DRC 4c5fa566 2021-11-17T16:09:50 CI: Halt immediately on all sanitizer errors
Piotr Kubaj d401d625 2021-10-27T03:39:09 PowerPC: Detect AltiVec support on FreeBSD Recent FreeBSD/PowerPC compilers, such as Clang 11.0.x on FreeBSD 13, do the equivalent of passing -maltivec to the compiler by default, so run-time AltiVec detection is unnecessary. However, it becomes necessary when using other compilers or when passing -mno-altivec to the compiler. Closes #552
DRC 2fd4ae7b 2021-10-27T14:00:15 JNI: Fix warnings/errors reported by -Xcheck:jni - Don't check for exceptions immediately after invoking the GetPrimitiveArrayCritical() method. That method does not throw exceptions, and checking for them caused -Xcheck:jni to warn about calling other JNI functions in the scope of Get/ReleasePrimitiveArrayCritical(). - Check for exceptions immediately after invoking the CallStaticObjectMethod() method in the PROP2ENV() macro. - Don't use the Get/ReleasePrimitiveArrayCritical() methods for small arrays. -Xcheck:jni didn't complain about that, but there is no performance advantage to using those methods rather than the Get*ArrayRegion() methods for small arrays, and using Get*ArrayRegion() makes the code less error-prone. - Don't release the source/destination planes arrays in the YUV methods until after the corresponding C TurboJPEG functions have returned.
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