From e74b0865ab6bbcdd0a5881e8ace9123c70363853 Mon Sep 17 00:00:00 2001 From: DRC Date: Mon, 25 Oct 2010 22:07:40 +0000 Subject: [PATCH] Add license and other supporting documentation from libjpeg-turbo git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4166 3789f03b-4d11-0410-bbf8-ca57d06f2519 --- common/jpeg/LGPL.txt | 504 ++++++++++++++++++++++++++++++++ common/jpeg/LICENSE.txt | 53 ++++ common/jpeg/README | 7 + common/jpeg/README-turbo.txt | 207 +++++++++++++ common/jpeg/README_TigerVNC.txt | 9 +- 5 files changed, 775 insertions(+), 5 deletions(-) create mode 100644 common/jpeg/LGPL.txt create mode 100644 common/jpeg/LICENSE.txt create mode 100755 common/jpeg/README-turbo.txt diff --git a/common/jpeg/LGPL.txt b/common/jpeg/LGPL.txt new file mode 100644 index 00000000..b1e3f5a2 --- /dev/null +++ b/common/jpeg/LGPL.txt @@ -0,0 +1,504 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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For more information about libjpeg-turbo, +please see http://libjpeg-turbo.virtualgl.org. + + The Independent JPEG Group's JPEG software ========================================== diff --git a/common/jpeg/README-turbo.txt b/common/jpeg/README-turbo.txt new file mode 100755 index 00000000..40350d04 --- /dev/null +++ b/common/jpeg/README-turbo.txt @@ -0,0 +1,207 @@ +******************************************************************************* +** Background +******************************************************************************* + +libjpeg-turbo is a high-speed version of libjpeg for x86 and x86-64 processors +which uses SIMD instructions (MMX, SSE2, etc.) to accelerate baseline JPEG +compression and decompression. libjpeg-turbo is generally 2-4x as fast +as the unmodified version of libjpeg, all else being equal. + +libjpeg-turbo was originally based on libjpeg/SIMD by Miyasaka Masaru, but +the TigerVNC and VirtualGL projects made numerous enhancements to the codec, +including improved support for Mac OS X, 64-bit support, support for 32-bit +and big endian pixel formats, accelerated Huffman encoding/decoding, and +various bug fixes. The goal was to produce a fully open source codec that +could replace the partially closed source TurboJPEG/IPP codec used by VirtualGL +and TurboVNC. libjpeg-turbo generally performs in the range of 80-120% of +TurboJPEG/IPP. It is faster in some areas but slower in others. + +It was decided to split libjpeg-turbo into a separate SDK so that other +projects could take advantage of this technology. The libjpeg-turbo shared +libraries can be used as drop-in replacements for libjpeg on most systems. + + +******************************************************************************* +** License +******************************************************************************* + +Some of the optimizations to the Huffman encoder (jchuff.c) and decoder +(jdhuff.c) were borrowed from VirtualGL, and thus any distribution of +libjpeg-turbo which includes those optimizations must, as a whole, be subject +to the terms of the wxWindows Library Licence, Version 3.1. A copy of this +license can be found in this directory under LICENSE.txt. The wxWindows +Library License is based on the LGPL but includes provisions which allow the +Library to be statically linked into proprietary libraries and applications +without requiring the resulting binaries to be distributed under the terms of +the LGPL. + +The rest of the source code, apart from the Huffman codec optimizations, falls +under a less restrictive, BSD-style license (see README.) You can choose to +distribute libjpeg-turbo, as a whole, under this BSD-style license by simply +replacing the optimized jchuff.c and jdhuff.c with their unoptimized +counterparts from the libjpeg v6b source. + + +******************************************************************************* +** Using libjpeg-turbo +******************************************************************************* + +============================= +Replacing libjpeg at Run Time +============================= + +If a Unix application is dynamically linked with libjpeg, then you can replace +libjpeg with libjpeg-turbo at run time by manipulating the LD_LIBRARY_PATH. +For instance: + + [Using libjpeg] + > time cjpeg vgl_5674_0098.jpg + real 0m0.392s + user 0m0.074s + sys 0m0.020s + + [Using libjpeg-turbo] + > export LD_LIBRARY_PATH=/opt/libjpeg-turbo/{lib}:$LD_LIBRARY_PATH + > time cjpeg vgl_5674_0098.jpg + real 0m0.109s + user 0m0.029s + sys 0m0.010s + +NOTE: {lib} can be lib, lib32, lib64, or lib/64, depending on the O/S and +architecture. + +System administrators can also replace the libjpeg sym links in /usr/{lib} with +links to the libjpeg dynamic library located in /opt/libjpeg-turbo/{lib}. This +will effectively accelerate every dynamically linked libjpeg application on the +system. + +The Windows distribution of the libjpeg-turbo SDK installs jpeg62.dll into +c:\libjpeg-turbo\bin, and the PATH environment variable can be modified such +that this directory is searched before any others that might contain +jpeg62.dll. However, if jpeg62.dll also exists in an application's install +directory, then Windows will load the application's version of it first. Thus, +if an application ships with jpeg62.dll, then back up the application's version +of jpeg62.dll and copy c:\libjpeg-turbo\bin\jpeg62.dll into the application's +install directory to accelerate it. + +The version of jpeg62.dll distributed in the libjpeg-turbo SDK requires the +Visual C++ 2008 C run time DLL (msvcr90.dll). This library ships with more +recent versions of Windows, but users of older versions can obtain it from the +Visual C++ 2008 Redistributable Package, which is available as a free download +from Microsoft's web site. + +NOTE: Features of libjpeg which require passing a C run time structure, such +as a file handle, from an application to libjpeg will probably not work with +the distributed version of jpeg62.dll unless the application is also built to +use the Visual C++ 2008 C run time DLL. In particular, this affects +jpeg_stdio_dest() and jpeg_stdio_src(). + +Mac applications typically embed their own copies of libjpeg.62.dylib inside +the (hidden) application bundle, so it is not possible to globally replace +libjpeg on OS X systems. If an application uses a shared library version of +libjpeg, then it may be possible to replace the application's version of it. +This would generally involve copying libjpeg.62.dylib into the appropriate +place in the application bundle and using install_name_tool to repoint the +dylib to the new directory. This requires an advanced knowledge of OS X and +would not survive an upgrade or a re-install of the application. Thus, it is +not recommended for most users. + +======================= +Replacing TurboJPEG/IPP +======================= + +libjpeg-turbo is a drop-in replacement for the TurboJPEG/IPP SDK used by +VirtualGL 2.1.x and TurboVNC 0.6 (and prior.) libjpeg-turbo contains a wrapper +library (TurboJPEG/OSS) that emulates the TurboJPEG API using libjpeg-turbo +instead of the closed source Intel Performance Primitives. You can replace the +TurboJPEG/IPP package on Linux systems with the libjpeg-turbo package in order +to make existing releases of VirtualGL 2.1.x and TurboVNC use the new codec at +run time. Note that the 64-bit libjpeg-turbo packages contain only 64-bit +binaries, whereas the TurboJPEG/IPP 64-bit packages contained both 64-bit and +32-bit binaries. Thus, to replace a TurboJPEG/IPP 64-bit package, install +both the 64-bit and 32-bit versions of libjpeg-turbo. + +You can also build the VirtualGL 2.1.x and TurboVNC 0.6 source code with +the libjpeg-turbo SDK instead of TurboJPEG/IPP. It should work identically. +libjpeg-turbo also includes static library versions of TurboJPEG/OSS, which +are used to build TurboVNC 1.0 and later. + +======================================== +Using libjpeg-turbo in Your Own Programs +======================================== + +For the most part, libjpeg-turbo should work identically to libjpeg, so in +most cases, an application can be built against libjpeg and then run against +libjpeg-turbo. On Unix systems, you can build against libjpeg-turbo instead +of libjpeg by setting + + CPATH=/opt/libjpeg-turbo/include + and + LIBRARY_PATH=/opt/libjpeg-turbo/{lib} + +({lib} = lib32 or lib64, depending on whether you are building a 32-bit or a +64-bit application.) + +If using Cygwin, then set + + CPATH=/cygdrive/c/libjpeg-turbo-gcc[64]/include + and + LIBRARY_PATH=/cygdrive/c/libjpeg-turbo-gcc[64]/lib + +If using MinGW, then set + + CPATH=/c/libjpeg-turbo-gcc[64]/include + and + LIBRARY_PATH=/c/libjpeg-turbo-gcc[64]/lib + +Building against libjpeg-turbo is useful, for instance, if you want to build an +application that leverages the libjpeg-turbo colorspace extensions (see below.) +On Linux and Solaris systems, you would still need to manipulate the +LD_LIBRARY_PATH or sym links appropriately to use libjpeg-turbo at run time. +On such systems, you can pass -R /opt/libjpeg-turbo/{lib} to the linker to +force the use of libjpeg-turbo at run time rather than libjpeg (also useful if +you want to leverage the colorspace extensions), or you can link against the +libjpeg-turbo static library. + +To force a Linux, Solaris, or MinGW application to link against the static +version of libjpeg-turbo, you can use the following linker options: + + -Wl,-Bstatic -ljpeg -Wl,-Bdynamic + +On OS X, simply add /opt/libjpeg-turbo/lib/libjpeg.a to the linker command +line (this also works on Linux and Solaris.) + +To build Visual C++ applications using libjpeg-turbo, add +c:\libjpeg-turbo[64]\include to your system or user INCLUDE environment +variable and c:\libjpeg-turbo[64]\lib to your system or user LIB environment +variable, and then link against either jpeg.lib (to use jpeg62.dll) or +jpeg-static.lib (to use the static version of libjpeg-turbo.) + +===================== +Colorspace Extensions +===================== + +libjpeg-turbo includes extensions which allow JPEG images to be compressed +directly from (and decompressed directly to) buffers which use BGR, BGRA, +RGBA, ABGR, and ARGB pixel ordering. This is implemented with six new +colorspace constants: + + JCS_EXT_RGB /* red/green/blue */ + JCS_EXT_RGBX /* red/green/blue/x */ + JCS_EXT_BGR /* blue/green/red */ + JCS_EXT_BGRX /* blue/green/red/x */ + JCS_EXT_XBGR /* x/blue/green/red */ + JCS_EXT_XRGB /* x/red/green/blue */ + +Setting cinfo.in_color_space (compression) or cinfo.out_color_space +(decompression) to one of these values will cause libjpeg-turbo to read the +red, green, and blue values from (or write them to) the appropriate position in +the pixel when YUV conversion is performed. + +Your application can check for the existence of these extensions at compile +time with: + + #ifdef JCS_EXTENSIONS + +At run time, attempting to use these extensions with a version of libjpeg +that doesn't support them will result in a "Bogus input colorspace" error. diff --git a/common/jpeg/README_TigerVNC.txt b/common/jpeg/README_TigerVNC.txt index c73070a6..1fb9a602 100644 --- a/common/jpeg/README_TigerVNC.txt +++ b/common/jpeg/README_TigerVNC.txt @@ -1,5 +1,4 @@ -This directory includes a copy of the Independent JPEG Group's JPEG -library (see the README file for more information). Not all the files -from the original distribution have been included into the TigerVNC -codebase. To obtain the original library, please see the README file, -section "ARCHIVE LOCATIONS". +This directory includes a copy of libjpeg-turbo (see README-turbo.txt for more +information.) Not all of the files from the original distribution have been +included into the TigerVNC codebase. To obtain the original library, please +visit http://libjpeg-turbo.VirtualGL.org. -- 2.39.5