These extensions allow Imaging to load and save images from/to
files in various formats.
File formats included in Imaging core (that is in
Source directory) must satisfy these requirements:
both loading and saving support, native crossplatform
Object Pascal implementation, support as many data formats as possible,
be stream safe (you have multiple images in one stream and you load them
one by one without exactly knowing where they start - after loading one
stream position must be precisely at the beginning of another - some
file formats (e.g. Daggerfall images) need to know exact file size during loading so
they are inherently unsafe).
File format loaders/savers that do not meet these requirements are
located in Extras package (
Some complex file formats make compiled binaries significantly larger.
Most notably TIFF (around 400 KiB),
JPEG (around 100 KiB), JPEG2000 (around 150 KiB), and PNG
(around 50 KiB). Some formats use others internally - MNG and JNG use
PNG and JPEG. If you know you won't be needing some of those formats
and you don't want large binaries you can disable them at compile stage.
This is done by uncommenting
DONT_LINK_* (where * is file format
identifier) symbols in
ImagingOptions.inc include file
All core file formats have corresponding symbols here and all
are enabled by default in this include file.
There is also
DONT_LINK_EXTRAS symbol that controls
automatic linking with file formats declared in Extras package
DONT_LINK_* symbols for these file format can be turned
unit located in
DONT_LINK_*. So if you used these symbols somewhere in you projects please check your code if it still works as intended after 0.26.2 installation.
ImagingOptions.incand comment out appropriate
$DEFINEstatement. So there was a problem when you had more projects using the same Imaging installation and each wanting to use different subset of file formats. With new symbols you don't have to edit the include file at all, just add
DONT_LINK_*to "Conditional defines" (or its Lazarus equivalent) in compiler options of each project.