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Diffstat (limited to 'src/3rdparty/libjpeg/src/README.md')
| -rw-r--r--[-rwxr-xr-x] | src/3rdparty/libjpeg/src/README.md | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/3rdparty/libjpeg/src/README.md b/src/3rdparty/libjpeg/src/README.md index 74e6eac45a..a769259891 100755..100644 --- a/src/3rdparty/libjpeg/src/README.md +++ b/src/3rdparty/libjpeg/src/README.md @@ -2,8 +2,9 @@ Background ========== libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, -NEON, AltiVec) to accelerate baseline JPEG compression and decompression on -x86, x86-64, ARM, and PowerPC systems. On such systems, libjpeg-turbo is +AVX2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression +on x86, x86-64, ARM, and PowerPC systems, as well as progressive JPEG +compression on x86 and x86-64 systems. On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg, all else being equal. On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines. In many cases, the @@ -48,7 +49,10 @@ JPEG images: straightforward to achieve using the underlying libjpeg API, such as generating planar YUV images and performing multiple simultaneous lossless transforms on an image. The Java interface for libjpeg-turbo is written on - top of the TurboJPEG API. + top of the TurboJPEG API. The TurboJPEG API is recommended for first-time + users of libjpeg-turbo. Refer to [tjexample.c](tjexample.c) and + [TJExample.java](java/TJExample.java) for examples of its usage and to + <http://libjpeg-turbo.org/Documentation/Documentation> for API documentation. - **libjpeg API**<br> This is the de facto industry-standard API for compressing and decompressing @@ -56,7 +60,8 @@ JPEG images: more powerful. The libjpeg API implementation in libjpeg-turbo is both API/ABI-compatible and mathematically compatible with libjpeg v6b. It can also optionally be configured to be API/ABI-compatible with libjpeg v7 and v8 - (see below.) + (see below.) Refer to [cjpeg.c](cjpeg.c) and [djpeg.c](djpeg.c) for examples + of its usage and to [libjpeg.txt](libjpeg.txt) for API documentation. There is no significant performance advantage to either API when both are used to perform similar operations. |