Log Message:
Changes 1.3.21:

Security Fixes:
---------------
Annotate: Some requestable text-subsitution attributes caused a crash.
All formats: Image dimensions are checked to assure that they are within limits \ 
before proceeding to read the image.
BMP: Fix hang (endless loop) for certain files.
DCM: Fix crash as well as small heap over-write.
DPX: Fix crash due to DPX file reporting more elements than it has.
MNG: Validate MHDR chunk length to avoid huge memory allocation and DOS.
PCX: Fix for CVE-2014-8355. Validate file header in order to avoid buffer overun \ 
later.
PDB: Detect arithmetic overflows when calculating buffer sizes. Fix crash in \ 
writer when image width is not even multiple of 16. Fix buffer overrun with 2 \ 
and 4-bit PDB image files.
PNM: Validate PGM, PPM, and PAM header MaxValue parameter to avoid crash on \ 
poorly-formed input.
PNG: Impose a 10-million limit on dimensions when reading a PNG file to avoid \ 
denial of service.
PSD: Avoid problems caused by huge PSD colormap size.
PSD: Fix small stack over-write if more than 99 layers are written to PSD format.
PSD: Returns immediately if pixel limit was exceeded.
RLE: URT RLE reader is now more robust with errant files.
SUN: Header validation is now made fully robust, and arithmetic overflows in \ 
buffer-size calculations are detected to avoid heap overwrite.
TIFF: Fix crashes for photometrics which may delivery one or three samples per \ 
pixel (was assuming always three).
VIFF: Fixes to prevent buffer overflow. Validate colormap indexes.
Windows delegates: Fix unexpected argument splitting when invoking an external \ 
delegate program via delegates.mgk.
WPG: Fix use of NULL pointers. Fix buffer overflows.
XPM: Detect truncated row and quit with error rather than over-running a buffer.
XWD: Improve header validation. Added to UnstableCoderClass since the reader for \ 
this format should not be entrusted with untrustworthy input.

Bug fixes:
----------
CIN: Fix problem with text attribute values which are not NULL terminated. \ 
Validate sizes claimed by Cineon header.
Coverity: Fixes for many issues detected by Coverity scan (see ChangeLog).
DPX: Fix problem with text attribute values which are not NULL terminated.
DPX: Fix severe corruption of little-endian 32-bit packed output. Corruption was \ 
severe enough that it would have been noticed immediately.
Delegates: Fix possible memory leaks when invoking external application.
FITS: Properly validate values provided by file header.
GIF: Fix use of uninitialized data.
JBIG: Fix memory leaks.
JNG: Fix double-free error in error path.
JPEG: Verify the number of output components before attempting to decode the image.
Magick++: Image resolutionUnits() was not always returning correct value.
Magick++: Locking has not been working properly since the code was written in \ 
1998. Apparently the issue has not been significant enough to cause run-time \ 
issues.
ICO: Windows icon reader is now much more robust.
MIFF: Reader now quits with an error if zip or bzip2 stream is corrupted.
MAT: Fix memory leaks.
PALM: Reader now reads various input formats (up to version 2) correctly whereas \ 
it was crashing or otherwise malfunctioning before. More work remains, \ 
particularly in the writer.
PCX: Eliminate memory leaks in error paths.
PDB: In PDB writer, void possible under-allocation due to arthimetic overflow \ 
when allocating packets.
PICT: Fix PICT reader crash with corrupted file.
PNG: Fix double-free error in error path.
PNG: Fixed handling of transparency when writing indexed PNG.
PNG: Avoid reading beyond the end of a tEXt keyword.
PSD: Fix error when reading PSDs files which have no layers.
RLA: Fix possible crash due to file header.
Signal Handling: Signal handling is now more robust and handles SIGSEGV and \ 
other critical signals. The sole purpose of the default signal handling is to \ 
remove any temporary files and quit. An informative message is printed for \ 
signals other than SIGINT.
SUN: Sun raster reader was not completely robust. Now it is.
SWF: Fix pixel cache access errors in 'ping' mode.
Text annotation: An empty text string is no longer treated as an error.
Text annotation: Fix regression added in 1.3.19 which caused spurious drawing \ 
errors to be produced while rendering with text when all of the text is off the \ 
left-hand side of the image.
TIFF: Fix unreliable reading JBIG compressed files by forcing use of strip \ 
reader rather than sometimes using scanline reader (which libtiff's JBIG codec \ 
does not support).
TIFF: Fix reading or writing planar min-is-white or min-is-black images with an \ 
associated alpha channel.
WebP: WebP writer now writes truely lossless output when requested.
identify / GetImageStatistics(): Failed to compute statistics for the Black \ 
channel of CMYK image files.
VICAR: Fix problem with continuing to "read" data when there is no \ 
more data left to read.
WMF: Fix memory leaks.
WPG: Fix potential DOS due to long reads during an error condition.
XPM: Avoid strncpy() of overlapping memory. Fixed memory leaks in error paths. \ 
Fixed bad memory access caused by empty file.

New Features:
-------------
compose: Supports composite operator names similar to the major *Magick brand, \ 
without losing any any compatibility with previous naming.
ICO: Windows ICO reader now supports reading PNG-encoded files.
Magick++ Geometry: New methods limitPixels() and fillArea() to support '@' and \ 
'^' geometry qualifiers. This enancement breaks the ABI due to previous use of \ 
inline methods and no place to put the new flags.
Magick++ Image::extent(): New method to place image on sized canvas of constant \ 
color using gravity.
Magick++ Image::formatExpression(): New method format a string based on a format \ 
similar to command-line -format.
Magick++ Image::resize(): New method to resize image specifying geometry, \ 
filter, and blur.
Magick++ STL extentImage: New New function object to invoke image extent method.
Magick++ Image::quiet(). New method which blocks (ignores) warning exceptions \ 
when passed a 'true' argument.
Resource limits: Added support for image Width and Height limits. Default image \ 
Width and Height limits are based on the range of a 32-bit signed integer, even \ 
for 64-bit builds which may have sufficient numeric range to image an entire \ 
galaxy. Limits may be increased as desired.
TIFF: Use define tiff:ignore-tags to ignore tags in 'corrupted' files with \ 
unknown and invalid tags. Use to read TIFF files which otherwise can not be read \ 
due to errors.
TIFF: Use '-define tiff:report-warnings=true' to enable that warnings reported \ 
by libtiff are thrown as warning exceptions so that they may be caught or will \ 
be reported at the gm command-line.
Windows Exceptions: A handler is registered (due to calling InitializeMagick()) \ 
to capture Windows Exceptions in a similar manner to the existing POSIX signal \ 
handler. If an application is using the library and wants to provide it own \ 
Windows exception handling, then it should make any changes after invoking \ 
InitializeMagick().

Windows Delegate Updates/Additions:
-----------------------------------
PNG: Update bundled libpng to 1.6.16. Resolves known security issues.
FreeType: Update bundled Freetype to 2.5.4. Resolves known security issues.
WebP: Update bundled WebP to 0.4.2 release.
WebP is auto-linked in Visual Studio.
Build Changes:

WebP is not included in the build when building with Visual Studio 6 (1998 \ 
vintage compiler!) since it requires more modern C.

Behavior Changes:
-----------------
AVI: Support for this format is removed since the implementation was worthless.
TIFF: Now uses YCbCr encoding when JPEG compression is requested for an RGB image.