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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