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Diffstat (limited to 'src/3rdparty/libjpeg/src/ChangeLog.md')
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1 files changed, 194 insertions, 2 deletions
diff --git a/src/3rdparty/libjpeg/src/ChangeLog.md b/src/3rdparty/libjpeg/src/ChangeLog.md index f5fe44bf85..8f0d11b1a6 100644 --- a/src/3rdparty/libjpeg/src/ChangeLog.md +++ b/src/3rdparty/libjpeg/src/ChangeLog.md @@ -1,3 +1,195 @@ +2.0.0 +===== + +### Significant changes relative to 2.0 beta1: + +1. The TurboJPEG API can now decompress CMYK JPEG images that have subsampled M +and Y components (not to be confused with YCCK JPEG images, in which the C/M/Y +components have been transformed into luma and chroma.) Previously, an error +was generated ("Could not determine subsampling type for JPEG image") when such +an image was passed to `tjDecompressHeader3()`, `tjTransform()`, +`tjDecompressToYUVPlanes()`, `tjDecompressToYUV2()`, or the equivalent Java +methods. + +2. Fixed an issue (CVE-2018-11813) whereby a specially-crafted malformed input +file (specifically, a file with a valid Targa header but incomplete pixel data) +would cause cjpeg to generate a JPEG file that was potentially thousands of +times larger than the input file. The Targa reader in cjpeg was not properly +detecting that the end of the input file had been reached prematurely, so after +all valid pixels had been read from the input, the reader injected dummy pixels +with values of 255 into the JPEG compressor until the number of pixels +specified in the Targa header had been compressed. The Targa reader in cjpeg +now behaves like the PPM reader and aborts compression if the end of the input +file is reached prematurely. Because this issue only affected cjpeg and not +the underlying library, and because it did not involve any out-of-bounds reads +or other exploitable behaviors, it was not believed to represent a security +threat. + +3. Fixed an issue whereby the `tjLoadImage()` and `tjSaveImage()` functions +would produce a "Bogus message code" error message if the underlying bitmap and +PPM readers/writers threw an error that was specific to the readers/writers +(as opposed to a general libjpeg API error.) + +4. Fixed an issue whereby a specially-crafted malformed BMP file, one in which +the header specified an image width of 1073741824 pixels, would trigger a +floating point exception (division by zero) in the `tjLoadImage()` function +when attempting to load the BMP file into a 4-component image buffer. + +5. Fixed an issue whereby certain combinations of calls to +`jpeg_skip_scanlines()` and `jpeg_read_scanlines()` could trigger an infinite +loop when decompressing progressive JPEG images that use vertical chroma +subsampling (for instance, 4:2:0 or 4:4:0.) + +6. Fixed a segfault in `jpeg_skip_scanlines()` that occurred when decompressing +a 4:2:2 or 4:2:0 JPEG image using the merged (non-fancy) upsampling algorithms +(that is, when setting `cinfo.do_fancy_upsampling` to `FALSE`.) + +7. The new CMake-based build system will now disable the MIPS DSPr2 SIMD +extensions if it detects that the compiler does not support DSPr2 instructions. + +8. Fixed out-of-bounds read in cjpeg that occurred when attempting to compress +a specially-crafted malformed color-index (8-bit-per-sample) BMP file in which +some of the samples (color indices) exceeded the bounds of the BMP file's color +table. + +9. Fixed a signed integer overflow in the progressive Huffman decoder, detected +by the Clang and GCC undefined behavior sanitizers, that could be triggered by +attempting to decompress a specially-crafted malformed JPEG image. This issue +did not pose a security threat, but removing the warning made it easier to +detect actual security issues, should they arise in the future. + + +1.5.90 (2.0 beta1) +================== + +### Significant changes relative to 1.5.3: + +1. Added AVX2 SIMD implementations of the colorspace conversion, chroma +downsampling and upsampling, integer quantization and sample conversion, and +slow integer DCT/IDCT algorithms. When using the slow integer DCT/IDCT +algorithms on AVX2-equipped CPUs, the compression of RGB images is +approximately 13-36% (avg. 22%) faster (relative to libjpeg-turbo 1.5.x) with +64-bit code and 11-21% (avg. 17%) faster with 32-bit code, and the +decompression of RGB images is approximately 9-35% (avg. 17%) faster with +64-bit code and 7-17% (avg. 12%) faster with 32-bit code. (As tested on a +3 GHz Intel Core i7. Actual mileage may vary.) + +2. Overhauled the build system to use CMake on all platforms, and removed the +autotools-based build system. This decision resulted from extensive +discussions within the libjpeg-turbo community. libjpeg-turbo traditionally +used CMake only for Windows builds, but there was an increasing amount of +demand to extend CMake support to other platforms. However, because of the +unique nature of our code base (the need to support different assemblers on +each platform, the need for Java support, etc.), providing dual build systems +as other OSS imaging libraries do (including libpng and libtiff) would have +created a maintenance burden. The use of CMake greatly simplifies some aspects +of our build system, owing to CMake's built-in support for various assemblers, +Java, and unit testing, as well as generally fewer quirks that have to be +worked around in order to implement our packaging system. Eliminating +autotools puts our project slightly at odds with the traditional practices of +the OSS community, since most "system libraries" tend to be built with +autotools, but it is believed that the benefits of this move outweigh the +risks. In addition to providing a unified build environment, switching to +CMake allows for the use of various build tools and IDEs that aren't supported +under autotools, including XCode, Ninja, and Eclipse. It also eliminates the +need to install autotools via MacPorts/Homebrew on OS X and allows +libjpeg-turbo to be configured without the use of a terminal/command prompt. +Extensive testing was conducted to ensure that all features provided by the +autotools-based build system are provided by the new build system. + +3. The libjpeg API in this version of libjpeg-turbo now includes two additional +functions, `jpeg_read_icc_profile()` and `jpeg_write_icc_profile()`, that can +be used to extract ICC profile data from a JPEG file while decompressing or to +embed ICC profile data in a JPEG file while compressing or transforming. This +eliminates the need for downstream projects, such as color management libraries +and browsers, to include their own glueware for accomplishing this. + +4. Improved error handling in the TurboJPEG API library: + + - Introduced a new function (`tjGetErrorStr2()`) in the TurboJPEG C API +that allows compression/decompression/transform error messages to be retrieved +in a thread-safe manner. Retrieving error messages from global functions, such +as `tjInitCompress()` or `tjBufSize()`, is still thread-unsafe, but since those +functions will only throw errors if passed an invalid argument or if a memory +allocation failure occurs, thread safety is not as much of a concern. + - Introduced a new function (`tjGetErrorCode()`) in the TurboJPEG C API +and a new method (`TJException.getErrorCode()`) in the TurboJPEG Java API that +can be used to determine the severity of the last +compression/decompression/transform error. This allows applications to +choose whether to ignore warnings (non-fatal errors) from the underlying +libjpeg API or to treat them as fatal. + - Introduced a new flag (`TJFLAG_STOPONWARNING` in the TurboJPEG C API and +`TJ.FLAG_STOPONWARNING` in the TurboJPEG Java API) that causes the library to +immediately halt a compression/decompression/transform operation if it +encounters a warning from the underlying libjpeg API (the default behavior is +to allow the operation to complete unless a fatal error is encountered.) + +5. Introduced a new flag in the TurboJPEG C and Java APIs (`TJFLAG_PROGRESSIVE` +and `TJ.FLAG_PROGRESSIVE`, respectively) that causes the library to use +progressive entropy coding in JPEG images generated by compression and +transform operations. Additionally, a new transform option +(`TJXOPT_PROGRESSIVE` in the C API and `TJTransform.OPT_PROGRESSIVE` in the +Java API) has been introduced, allowing progressive entropy coding to be +enabled for selected transforms in a multi-transform operation. + +6. Introduced a new transform option in the TurboJPEG API (`TJXOPT_COPYNONE` in +the C API and `TJTransform.OPT_COPYNONE` in the Java API) that allows the +copying of markers (including EXIF and ICC profile data) to be disabled for a +particular transform. + +7. Added two functions to the TurboJPEG C API (`tjLoadImage()` and +`tjSaveImage()`) that can be used to load/save a BMP or PPM/PGM image to/from a +memory buffer with a specified pixel format and layout. These functions +replace the project-private (and slow) bmp API, which was previously used by +TJBench, and they also provide a convenient way for first-time users of +libjpeg-turbo to quickly develop a complete JPEG compression/decompression +program. + +8. The TurboJPEG C API now includes a new convenience array (`tjAlphaOffset[]`) +that contains the alpha component index for each pixel format (or -1 if the +pixel format lacks an alpha component.) The TurboJPEG Java API now includes a +new method (`TJ.getAlphaOffset()`) that returns the same value. In addition, +the `tjRedOffset[]`, `tjGreenOffset[]`, and `tjBlueOffset[]` arrays-- and the +corresponding `TJ.getRedOffset()`, `TJ.getGreenOffset()`, and +`TJ.getBlueOffset()` methods-- now return -1 for `TJPF_GRAY`/`TJ.PF_GRAY` +rather than 0. This allows programs to easily determine whether a pixel format +has red, green, blue, and alpha components. + +9. Added a new example (tjexample.c) that demonstrates the basic usage of the +TurboJPEG C API. This example mirrors the functionality of TJExample.java. +Both files are now included in the libjpeg-turbo documentation. + +10. Fixed two signed integer overflows in the arithmetic decoder, detected by +the Clang undefined behavior sanitizer, that could be triggered by attempting +to decompress a specially-crafted malformed JPEG image. These issues did not +pose a security threat, but removing the warnings makes it easier to detect +actual security issues, should they arise in the future. + +11. Fixed a bug in the merged 4:2:0 upsampling/dithered RGB565 color conversion +algorithm that caused incorrect dithering in the output image. This algorithm +now produces bitwise-identical results to the unmerged algorithms. + +12. The SIMD function symbols for x86[-64]/ELF, MIPS/ELF, macOS/x86[-64] (if +libjpeg-turbo is built with YASM), and iOS/ARM[64] builds are now private. +This prevents those symbols from being exposed in applications or shared +libraries that link statically with libjpeg-turbo. + +13. Added Loongson MMI SIMD implementations of the RGB-to-YCbCr and +YCbCr-to-RGB colorspace conversion, 4:2:0 chroma downsampling, 4:2:0 fancy +chroma upsampling, integer quantization, and slow integer DCT/IDCT algorithms. +When using the slow integer DCT/IDCT, this speeds up the compression of RGB +images by approximately 70-100% and the decompression of RGB images by +approximately 2-3.5x. + +14. Fixed a build error when building with older MinGW releases (regression +caused by 1.5.1[7].) + +15. Added SIMD acceleration for progressive Huffman encoding on SSE2-capable +x86 and x86-64 platforms. This speeds up the compression of full-color +progressive JPEGs by about 85-90% on average (relative to libjpeg-turbo 1.5.x) +when using modern Intel and AMD CPUs. + + 1.5.3 ===== @@ -174,8 +366,8 @@ specified.) 2x2 luminance sampling factors and 2x1 or 1x2 chrominance sampling factors. This is a non-standard way of specifying 2x subsampling (normally 4:2:2 JPEGs have 2x1 luminance and 1x1 chrominance sampling factors, and 4:4:0 JPEGs have -1x2 luminance and 1x1 chrominance sampling factors), but the JPEG specification -and the libjpeg API both allow it. +1x2 luminance and 1x1 chrominance sampling factors), but the JPEG format and +the libjpeg API both allow it. 7. Fixed an unsigned integer overflow in the libjpeg memory manager, detected by the Clang undefined behavior sanitizer, that could be triggered by |