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wmaker/wrlib
Doug Torrance dfa92906c0 wrlib: Compile with either ImageMagick 6 and 7
We dropped ImageMagick 6 support in 0.95.9.  However, ImageMagick 6 is
still widespread (e.g., ImageMagick 7 has not been packaged in Debian
yet), and upstream plans on maintaining it until at least 2028 [1].

In this patch, we detect the version of the MagickWand library installed
on the user's system and include the appropriate header file when
building wrlib.

Note: I've only tested this with ImageMagick 6, so I'd appreciate
confirmation that it works with ImageMagick 7.

[1] https://github.com/ImageMagick/ImageMagick6/blob/master/NEWS.txt
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WindowMaker raster graphics library

This library is used to manipulate images and convert them to
a format that can be displayed through the X window system.
Read the wraster.h header for an idea of what is available


This Library is LGPL and
Copyright (c) Alfredo K. Kojima <kojima@inf.ufrgs.br>


The following environment variables control some parameters:

RIMAGE_CACHE <integer>

Is the maximum number of images to store in the internal cache.
Default is 8

RIMAGE_CACHE_SIZE <integer>

Is the size of the biggest image to store in the cache.
Default is 4k (64x64)



Porting
=======

It should be fairly easy to port it to other environments
(svgalib, libggi etc), probably only requiring wraster.h,
context.c and convert.c to be changed. Note that the X specific
code should be disabled in that case, including support for libXpm.