When iceiceice (@cbeck88) added "save screenshots as PNGs" support back in 2014
(8dfdc6b185) we had yet to switch to SDL 2. At the
time, SDL_Image didn't provide any method of saving PNG files on its own. However,
it does as of SDL_Image 2.0.0.
A small caveat is that this built-in PNG save functionality is a bit less efficient
at compression than SDL_SavePNG. A test in DiD S1 with SDL_SavePNG_RW vs IMG_SavePNG_RW
yielded a file ~ 1 MB larger in the latter case.
This removed SDL_SavePNG and it's optional build-time dependency of libpng.
At branch 'doc-from-discord-boost-discussion-20170926'.
The build documentation and scripts were slightly out of date about
Boost. This commit makes a (probably interim) update to them.
(CMakeLists.txt|SConstruct): `wesnoth` won't build using Boost earlier
than '1.50.0'. Boost 1.50.0 changed the location of version 3 of Boost
filesystem, from 'boost/filesystem/v3/' (e.g. for
'using boost::filesystem::v3::path;') to 'boost/filesystem/' (e.g. for
'using boost::filesystem::path;', enforced since the very introduction
of 'src/filesystem_boost.cpp'), making it incompatible unless using
precompiler directives for supporting backwards versions of Boost
filesystem prior than '1.50.0'. Using Boost 1.50.0 (and 51, 52 etc.)
`wesnoth` is able build and run. I checked using `ldd` that I am right
about the run time environment.
INSTALL.md: Requirement of Boost libraries version up to date.
projectfiles/VC12/README.md: Requirement of Boost libraries up to
date, only the statement of which one is the minimum version, not the
rest of the build guide for Boost as requirement.
.gitignore: Add KDevelop backup documents.
This also removes the included SHA1 and MD5 implementations
in favour of those from OpenSSL.
Thanks to @jyrkive for helping to get the CMake build working and
ensuring the game still compiles with OpenSSL 1.1.0.
(The SHA_xxx() aliases were removed in OpenSSL 1.1.0.)
