Update 2:
1) Exceptions
The macro (not sure of the underlying primitives) "catch" will catch
errors. The web page didn't even call them exceptions, which explains
why I/google didn't find it quickly.
Ex: when converting an image that might already be RGB to RGB:
(catch (gimp-image-convert-rgb image))
2) The layer issue
As stated before, an earlier command was obliterating my layer and I
forgot to take the head of the get-active-{layer,drawable} in my later
operations.
3) Assertation failures and segfaults
The assertation failures are probably somehow connected with my layer
merging - not that it is good to be able to hit this so easily. I
also found a segfault, do to out of range arguments, since my previous
post and see that this doesn't crash the program - so its running in a
different thread or processs I guess. Not sure if I can catch this
with "catch", if I can't then I'll have to fix these corner cases.
Perhaps I'll make some patches for the function documentation if
people are interested.
Thomas
On Tue, Nov 24, 2009 at 11:34 AM, Thomas DuBuisson
<thomas.dubuis...@gmail.com> wrote:
> Update:
>
> 1) The question regarding exceptions remains - there are too many
> corner cases, mostly undocumented, so it would be nice to ignore them
> silently.
>
> 2) I see my fix was almost right but I forgot to take the head of the list:
> "(car (gimp-image-get-active-drawable image))" is what I want, not the
> no-longer-existing layer0 or the whole list returned by
> gimp-image-get-active-{layer,drawable}.
>
> 3) I still get things like the message below, so same question.
> (gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
> assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
> failed
>
>
>
> On Tue, Nov 24, 2009 at 10:05 AM, Thomas DuBuisson
> <thomas.dubuis...@gmail.com> wrote:
>> Hello list,
>>
>> I am planning on evolving image transformations using an AST of the
>> script-fu langauge and generating random (but syntatically correct)
>> scripts. I would like to avoid programming in hundreds of corner
>> cases into the system and thus have the following questions:
>>
>> 1) Script-fu throws exceptions
>>
>> If/when I do something basic like call "gimp-image-raise-layer" on a
>> layer that can not be raised, an exception is thrown. I would very
>> much like to catch/ignore exceptions such as this but it seems
>> script-fu is too primitive. Am I missing something?
>>
>> 2) gimp-layer-new-from-drawable nearly always fails
>>
>> ------------- CODE --------------
>> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png"
>> "image.png")))
>> (layer0 (car (gimp-image-get-active-layer image))))
>> (let* ((layer1 (car (gimp-image-flatten image))))
>> (gimp-layer-set-mode layer1 25)
>> ) (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> ...
>> ----------------- END CODE --------------
>>
>> In the above you see I define layer0 as the active layer (which I
>> thought was a drawable) but this doesn't work for
>> gimp-layer-new-from-drawable. Replacing layer0 with 'image' also
>> doesn't work and most frustratingly, using "
>> (gimp-image-get-active-drawable image)" also doesn't work - which I
>> really thought it should based on the documentation. What does this
>> function expect?
>>
>> (I understand gimp-image-flatten somehow screws everything up by
>> eliminating the layer, but am still not clear how to once-again get a
>> valid layer from my image)
>>
>>
>> 3) C Assertation failures
>> Perhaps most concerning are the assertation failures. Presumably,
>> these are not supposed to happen. How concerned should I be?
>>
>> -------------------- START CONSOLE DUMP -------------------------
>>> (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE "image.png"
>>> "image.png")))
>> (layer0 (car (gimp-image-get-active-layer image))))
>> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> (gimp-layer-add-alpha layer1)
>> (gimp-image-merge-down image layer1 2))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((layer1 (car (gimp-image-flatten image))))
>> (gimp-layer-set-opacity layer1 21.811554)
>> (gimp-image-merge-down image layer1 0))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((layer1 (car (gimp-layer-new-from-drawable layer0 image))))
>> (gimp-layer-flatten layer1)
>> (gimp-image-merge-down image layer1 0))
>> (set! layer0 (gimp-image-get-active-layer image))
>> (let* ((currDraw (car (gimp-image-get-active-layer image))))
>> (gimp-file-save RUN-NONINTERACTIVE image currDraw "newImage.png"
>> "newImage.png" ))
>> )
>>
>> (gimp-console:2987): Gimp-Core-CRITICAL **: gimp_image_remove_layer:
>> assertion `gimp_container_have (image->layers, GIMP_OBJECT (layer))'
>> failed
>>
>> ---------------------------- END CONSOLE DUMP -------------------------
>>
>>
>> Cheers,
>> Thomas
>>
>
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