imagepng("file", $comp_mode, $filter_mode);
The filters are defined in the libpng docs for png_set_filter
allow to divide the size of png images by more than 2. Constants
will be added later
BC kept, by default no filter are set
Fine to MFH? With the constants?
. GD is now thread-safe thanks to wrappers around freetype library
. Significant optimization to png writing code.
. Miscellaneous fixes.
Fixed memory leak inside php_imagettftext_common()
Make ext/gd compile with GD 2.0.17+ (gdFreeFontCache() is not avaliable)
conversion. The same crash still occures with png/jpeg -> gd -> png/jpeg, because
apparently gd format cannot handle truecolor images.
Turned off debug messages inside gd_gd2.c.
This initial checkin has no changes to any of the libgd code so it can
be used as a basis for diffs. It also will not build currently because
of this. The PHP gd checks need to be incorporated along with a bit of
other config magic. It also shouldn't break the build and will only
take effect if you use --with-gd=php right now.