graphicsmagick: Update to 1.3.35

1.3.35 (February 23, 2020)
==========================

Special Issues:

* It has been discovered that the 'ICU' library (a perhaps 30MB C++
  library) which is now often a libxml2 dependendency causes huge
  process initialization overhead.  This is noticed as unexpected
  slowness when GraphicsMagick utilities are used to process small to
  medium sized files.  The time to initialize the 'ICU' library is
  often longer than the time that GraphicsMagick would otherwise
  require to read the input file, process the image, and write the
  output file.  If the 'ICU' dependency can not be avoided, then make
  sure to use the modules build so there is only impact for file
  formats which require libxml2.  Please lobby the 'ICU' library
  developers to change their implementation to avoid long start-up
  times due to merely linking with the library.

Security Fixes:

* GraphicsMagick is now participating in Google's oss-fuzz project due
  to the contributions and assistance of Alex Gaynor. Since February 4
  2018, 398 issues have been opened by oss-fuzz (some of which were
  benign build issues) and 11 issues remain open.
  The issues list is available at
  https://bugs.chromium.org/p/oss-fuzz/issues/list under search term
  "graphicsmagick".  Issues are available for anyone to view and
  duplicate if they have been in "Verified" status for 30 days, or if
  they have been in "New" status for 90 days.  There are too many
  fixes to list here.  Please consult the GraphicsMagick ChangeLog
  file, Mercurial repository commit log, and the oss-fuzz issues list
  for details.

Bug fixes:

* Fix broken definition of ResourceInfinity which resulted in that
  GetMagickResource() would return -1 rather than the maximum range
  value for the return type as documented. (problem added by the
  1.3.32 release).

* ModifyCache(): Re-open the pixel cache if the cache rows/columns do
  not match the owning image rows/columns.

* Fix DisplayImages() return status.  The return status was inverted.

* HISTOGRAM: Histogram once again includes the histogram as a text
  comment.  This became broken by previous security fixes.

* PICT: Fixed heap buffer overuns reported multiple sources.

* JNG: Detect when JPEG encoder has failed and throw an exception.

* MVG/DrawImage(): Performs even more parsing validations.

* Clang static analyzer fixes: A great many fixes were made based on
  problem reports by the Clang static analyzer.

* Visual Studio static analyzer fixes: A great many fixes were made
  based on problem reports by the Visual Studio 2019 static analyzer.
  Many of these may improve the robustness of 64-bit code.

New Features:

* GRADIENT/GradientImage(): Improved accuracy of gradient levels as
  well as dramaticaly improving performance.  Output PseudoClass
  images if we can.  Add support for using the image 'gravity'
  attribute as well as the "gradient:direction" definition to produce
  gradient vector directions corresponding to SouthGravity (the
  previously-existing default), NorthGravity, WestGravity,
  EastGravity, NorthWestGravity, NorthEastGravity, SouthWestGravity,
  and SouthEastGravity.

API Updates:

* InitializeMagickEx(): New function which may be used in place of
  InitializeMagick() to initialize GraphicsMagick.  This
  initialization function returns an error status value, may update a
  passed ExceptionInfo structure with error information, and provides
  an options parameter which supports simple bit-flags to tailor
  initialization.  The signal handler registrations are skipped if the
  MAGICK_OPT_NO_SIGNAL_HANDER flag is set in the options.

Feature improvements:

* Replace use of non-reentrant legacy POSIX functions with reentrant
  equivalents.

* Timing of image reads should now be very accurate.  The timer was
  sometimes not stopped as soon as it should be.

* PICT: The PICT reader is working pretty good now.  It handles all
  the PICT image files I have available to me.

Windows Delegate Updates/Additions:

* None

Build Changes:

* Visual Studio Build: Configure program now provides a checkbox to
  enable common optimizations for better performance.

Behavior Changes:

* POSIX Signals: Use the normal termination signal handler for SIGXCPU
  and SIGXFSZ so that ulimit or setrlimit(2) may be used to apply CPU
  (RLIMIT_CPU) and output file size (RLIMIT_FSIZE) limits with the
  normal cleanup, and without dumping core. Note that any output files
  currently being written may be truncated and files being written by
  external programs (e.g. Ghostscript) might be left behind unless
  they are to a temporary file assigned by GraphicsMagick.

* Some private string and integer constants were removed from the
  apparent library ABI.  Some private functions were marked static and
  removed from the apparent library ABI.  This is mentioned because
  someone is sure to notice and be concerned about it.

* The remaining private content in installed header files was moved
  into -private.h header files which are not installed.  This should
  not be cause for concern but is mentiond because someone is sure to
  notice and be concerned about it.


(nia)