libcupsfilters 2.0b4

[tillkamppeter]

Adaptation to QPDF 11, Coverity scan and fixes, several other bug fixes.

• Do not free cf_image_t data structure in _cfImageZoomDelete() (cups-filters issue #507)
  The library-internal _cfImageZoom...() API does not create the cf_image_t data structure, so it should not free it, to avoid double-free crashes. This made the cfFilterImageToRaster() filter function (imagetoraster CUPS filter) crash.
• cfImageOpenFP(): Removed leftover HAVE_LIBZ conditionals
  In the 3rd beta we have removed the dependency on libz from the build system as there is no explicit dependency on it in libcupsfilters. Having forgotten to remove HAVE_LIBZ from the conditionals in cfImageOpenFP() PNG images were rendered as blank pages. See cups-filters issue #465.
• Compatibility with QPDF 11 and later
  • Replaced deprecated PointerHolder with shared_ptr (PR replaced PointerHolder with shared_ptr #13)
  • cfFilterPDFToPDF(): Replaced deprecated QPDF function name replaceOrRemoveKey by replaceKey.
  • Set CXXFLAGS="-DPOINTERHOLDER_TRANSITION=0" to silence QPDF warnings.
• Coverity check done by Zdenek Dohnal for the inclusion of libppd in Fedora and Red Hat. Zdenek has fixed all the issues: Missing free(), files not closed, potential string overflows, ... Thanks a lot!
• configure.ac: Change deprecated AC_PROG_LIBTOOL for LT_INIT (PR configure.ac: Change deprecated AC_PROG_LIBTOOL for LT_INIT #12)
• INSTALL: Explain dependencies (PR INSTALL: Explain deps #10)

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This discussion was created from the release libcupsfilters 2.0b4.