kc3-lang/libjpeg-turbo/cmakescripts/BuildPackages.cmake
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Hash : e8b40f3c
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Date : 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.
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cmakescripts/BuildPackages.cmake
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# This file is included from the top-level CMakeLists.txt. We just store it # here to avoid cluttering up that file. ############################################################################### # Linux RPM and DEB ############################################################################### if(CMAKE_SYSTEM_NAME STREQUAL "Linux") set(RPMARCH ${CMAKE_SYSTEM_PROCESSOR}) if(CPU_TYPE STREQUAL "x86_64") set(DEBARCH amd64) elseif(CPU_TYPE STREQUAL "arm64") set(DEBARCH ${CPU_TYPE}) elseif(CPU_TYPE STREQUAL "arm") check_c_source_compiles(" #if __ARM_PCS_VFP != 1 #error \"float ABI != hard\" #endif int main(void) { return 0; }" HAVE_HARD_FLOAT) if(HAVE_HARD_FLOAT) set(RPMARCH armv7hl) set(DEBARCH armhf) else() set(RPMARCH armel) set(DEBARCH armel) endif() elseif(CMAKE_SYSTEM_PROCESSOR_LC STREQUAL "ppc64le") set(DEBARCH ppc64el) elseif(CPU_TYPE STREQUAL "powerpc" AND BITS EQUAL 32) set(RPMARCH ppc) set(DEBARCH ppc) else() set(DEBARCH ${CMAKE_SYSTEM_PROCESSOR}) endif() message(STATUS "RPM architecture = ${RPMARCH}, DEB architecture = ${DEBARCH}") # Re-set CMAKE_POSITION_INDEPENDENT_CODE so that the RPM spec file works # properly boolean_number(CMAKE_POSITION_INDEPENDENT_CODE) configure_file(release/makerpm.in pkgscripts/makerpm) configure_file(release/rpm.spec.in pkgscripts/rpm.spec @ONLY) add_custom_target(rpm pkgscripts/makerpm SOURCES pkgscripts/makerpm) configure_file(release/makesrpm.in pkgscripts/makesrpm) add_custom_target(srpm pkgscripts/makesrpm SOURCES pkgscripts/makesrpm DEPENDS dist) configure_file(release/makedpkg.in pkgscripts/makedpkg) configure_file(release/deb-control.in pkgscripts/deb-control) add_custom_target(deb pkgscripts/makedpkg SOURCES pkgscripts/makedpkg) endif() # Linux ############################################################################### # Windows installer (NullSoft Installer) ############################################################################### if(WIN32) if(MSVC) set(INST_PLATFORM "Visual C++") set(INST_ID vc) set(INST_NAME ${CMAKE_PROJECT_NAME}-${VERSION}-${INST_ID}) set(INST_REG_NAME ${CMAKE_PROJECT_NAME}) elseif(MINGW) set(INST_PLATFORM GCC) set(INST_ID gcc) set(INST_NAME ${CMAKE_PROJECT_NAME}-${VERSION}-${INST_ID}) set(INST_REG_NAME ${CMAKE_PROJECT_NAME}-${INST_ID}) set(INST_DEFS -DGCC) endif() if(BITS EQUAL 64) set(INST_PLATFORM "${INST_PLATFORM} 64-bit") set(INST_NAME ${INST_NAME}64) set(INST_REG_NAME ${INST_REG_NAME}64) set(INST_DEFS ${INST_DEFS} -DWIN64) endif() if(WITH_JAVA) set(INST_DEFS ${INST_DEFS} -DJAVA) endif() if(GENERATOR_IS_MULTI_CONFIG) set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=${CMAKE_CFG_INTDIR}\\") else() set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=") endif() string(REGEX REPLACE "/" "\\\\" INST_DIR ${CMAKE_INSTALL_PREFIX}) configure_file(release/installer.nsi.in installer.nsi @ONLY) # TODO: It would be nice to eventually switch to CPack and eliminate this mess, # but not today. configure_file(win/projectTargets.cmake.in win/${CMAKE_PROJECT_NAME}Targets.cmake @ONLY) configure_file(win/${INST_ID}/projectTargets-release.cmake.in win/${CMAKE_PROJECT_NAME}Targets-release.cmake @ONLY) if(WITH_JAVA) set(JAVA_DEPEND turbojpeg-java) endif() if(WITH_TURBOJPEG) set(TURBOJPEG_DEPEND turbojpeg turbojpeg-static tjbench) endif() add_custom_target(installer makensis -nocd ${INST_DEFS} installer.nsi DEPENDS jpeg jpeg-static rdjpgcom wrjpgcom cjpeg djpeg jpegtran ${JAVA_DEPEND} ${TURBOJPEG_DEPEND} SOURCES installer.nsi) endif() # WIN32 ############################################################################### # Mac DMG ############################################################################### if(APPLE) set(ARMV8_BUILD "" CACHE PATH "Directory containing Armv8 iOS or macOS build to include in universal binaries") set(MACOS_APP_CERT_NAME "" CACHE STRING "Name of the Developer ID Application certificate (in the macOS keychain) that should be used to sign the libjpeg-turbo DMG. Leave this blank to generate an unsigned DMG.") set(MACOS_INST_CERT_NAME "" CACHE STRING "Name of the Developer ID Installer certificate (in the macOS keychain) that should be used to sign the libjpeg-turbo installer package. Leave this blank to generate an unsigned package.") configure_file(release/makemacpkg.in pkgscripts/makemacpkg) configure_file(release/Distribution.xml.in pkgscripts/Distribution.xml) configure_file(release/Welcome.rtf.in pkgscripts/Welcome.rtf) configure_file(release/uninstall.in pkgscripts/uninstall) add_custom_target(dmg pkgscripts/makemacpkg SOURCES pkgscripts/makemacpkg) endif() # APPLE ############################################################################### # Generic ############################################################################### add_custom_target(dist COMMAND git archive --prefix=${CMAKE_PROJECT_NAME}-${VERSION}/ HEAD | gzip > ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_PROJECT_NAME}-${VERSION}.tar.gz WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}) configure_file(release/maketarball.in pkgscripts/maketarball) add_custom_target(tarball pkgscripts/maketarball SOURCES pkgscripts/maketarball) configure_file(release/libjpeg.pc.in pkgscripts/libjpeg.pc @ONLY) if(WITH_TURBOJPEG) configure_file(release/libturbojpeg.pc.in pkgscripts/libturbojpeg.pc @ONLY) endif() include(CMakePackageConfigHelpers) write_basic_package_version_file( pkgscripts/${CMAKE_PROJECT_NAME}ConfigVersion.cmake VERSION ${VERSION} COMPATIBILITY AnyNewerVersion) configure_package_config_file(release/Config.cmake.in pkgscripts/${CMAKE_PROJECT_NAME}Config.cmake INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${CMAKE_PROJECT_NAME})