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/trunk/GIMP Incompatibilities.md
0,0 → 1,61
Incompatibilities with GIMP / PSPI
----------------------------------
1. Filter cannot be loaded by PSPI, because of a memory error.
Status: FIXED (Bug in FF) in FilterFoundry 1.7
FilterFoundry 1.6 used wrong length values for the TLV (Type, Length, Value) members
of the PIPL structure (in RC files, and in fixpipl()).
The length value must include everything, including paddings of strings.
Adobe writes in SPPiPL.h:
"Number of characters in the data array. Rounded to a multiple of 4."
On the other hand, the 1997 PICA documentation (page 23) and
1996 "Cross-Application Plug-in Development Resource Guide" describes:
"Contains the length of the propertyData field. It does not include any padding bytes after
propertyData to achieve four byte alignment. This field may be zero."
I think this is not correct, since even official plugins of Adobe (e.g. "3D Transform.8bf")
are rounding the length to a multiple of 4 (actually, rounding to the next possible multiple 4,
so that padding is always guaranteed).
2. Filters will only fill the bottom of the picture, not the whole canvas.
Status: FIXED (Workaround) in FilterFoundry 1.7
The reason is that OnContinue/main.c:RequestNext() processes the image in chunks,
and probably due to a bug, PSPI only applies the image data of the last chunk.
Workaround applied in FF 1.7: If the host signature is "GIMP" (PMIG), then we set
needall=1 to disable chunked processing.
3. When you re-open the main window, the formulas of the previous session vanish.
Status: FIXED (Workaround) in FilterFoundry 1.7
The reason is a bug in PSPI: The host should preserve the value of pb->parameters, which PSPI does not do.
Also, all global variables are unloaded, so the plugin cannot preserve any data.
Workaround in FF 1.7: If the host GIMP is detected, the new flag persistent_savestate will be set.
This mode saves the filter data into a temporary file "tmp.afs" and loads it
when the window is opened again.
4. Saving does not work
Status: FIXED (Workaround) in FilterFoundry 1.7
Filters could not be saved as AFS files because PSPI can't handle zero-sized handles
(PINEWHANDLE), so FF 1.7 is now assigning 1 byte for these.
5. For a 1920x1080 picture, the fitzoom in GIMP/PSPI is not correct. It is 8% on GIMP but should be 7%.
Status: FIXED (Workaround) in FilterFoundry 1.7
The reason is that FilterFoundry adjusts the zoom level if the available memory is low.
PSPI sets maxSpace to 100 MB hardcoded. It is probably only a dummy value and doesn't
resemble the actual space GIMP can assign to the plugin.
In Photoshop, maxSpace is 825 MB.
Workaround in FF 1.7: If GIMP/PSPI is detected, the adjustment of the zoom level is disabled.