Zlib is a "better" compression in the meaning that it is a more advanced
and complex algorithm than RLE. And in most cases, it should end up in
smaller file sizes. But as any algorithm, there may be cases when the
expectations are not met (worst cases or such). That's the nature of the
maths. Still we should not make the checkbox text over-complicated (it
is not the place to teach algorithmic), yet we can at least add a small
tooltip text.
* The minimum GIMP version for this XCF is always written down when it
is GIMP 2.8 or over.
* The list of features warrating the minimum version is now listed in an
expander container rather than as tooltip (making the list actually
discoverable!).
* The warning on compression is now displayed as its own text under the
checkbox (only when checking the box actually changes anything
compatibility-wise), and not as additional text to the minimum GIMP
version label. Otherwise it had far too much weight on the minimum
compatible GIMP version text and people were wondering what it meant.
We should not tell people what the checkbox cannot do (it cannot
improve compatibility in some cases), only what it can do (it can
improve compatibility in other cases).
* Update the feature list real-time when checking the compression box
(making it even more obvious that tile compression may have a say in
compatibility).
* Metadata info is still added on the GIMP version label as it does not
limit compatibility of the XCF file itself.
...won't work with older GIMP?
Make gimp_image_get_xcf_version() return a "reason" string which lists
all reasons why the image can't be saved with compatibility for older
GIMP versions. Display the reason as tooltip on the compat hint label
in the save dialog.
Both in the GimpImage API and in the GUI. The toggle in the save
dialog now controls ZLIB compression directly. Changed the various
info labels accordingly. Ditch the XCF parasite that saved the XCF
compat mode.
Nobody has them anymore, and they are deprecated in GTK+ 3.x. This
also fixes all conflicting mnemonics except those I missed, but we can
fix them now.
Change GimpFileDialog's file-procs properties to enum
GimpFileProcedureGroup and get them via the newly added API. Set
properties common to all dialogs in the parent class.
file-procedure.[ch] is gone and its functions moved to
GimpPlugInManager where they belong (the manager keeps around the
lists of load, save and export procedures).
Utility functions from file-utils.[ch] that have nothing to do with
image files moved to core/gimp-utils.[ch].
Metadata presence implies XCF version 6 or higher. Yet metadata are
stored in parasites which are perfecly supported in older GIMP versions
and are passed along through saving.
Therefore there is no need to keep XCF 6. We just add a warning telling
that metadata won't be visible in older GIMP when saving a file with
metadata and compatibility mode.
By default, it only saves the current file filter, but it allows a child
to implement its own state. It has been implemented by GimpSaveDialog to
save the preferred compatibility mode as well.
The code refactoring allows better readability which will allow in turn
to add more complex specific features making good use of the save/export
split concept.
