Bug: gimp-drawable-get-pixel fails despite channels visible in UI

[programmer_ceds]

(07-03-2025, 08:20 PM)Ofnuts Wrote: The Script-fu browser doc also says that gimp-drawable-get-pixel returns a GeglColor, even if it doesn't document any way to extract data from this.

That's what it says but the following code works in V3.0.4 in an scm file in the plug-ins folder:

Code:

 ; Check if a pixel is opaque - it is not opaque if it lies outside the bounds of the unrotated image
 ;
 (define (pixel_is_opaque x y)
   (let* (
      (result FALSE)
      (pixel_value '())
      )
       (if (and (>= x 0) (< x width) (>= y 0) (< y height))
         (begin
         (set! pixel_value (gimp-drawable-get-pixel inLayer x y))
         (if (= (cadddr pixel_value) 255)
           (set! result TRUE)
         )    ; end - if
         )    ; end - begin
       )    ; end - if
       (list
         result
       )
    )    ; end - let
 )    ; end - define

The full code is available in https://programmer97.byethost10.com/File...cm_GV3.scm

I seem to remember a commit in this area but can't currently find it.

The GIMP activation line is:
/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=gimp-3.0 --file-forwarding org.gimp.GIMP @@u %U @@ --pdb-compat-mode=warn

I don't suppose that it makes any difference but the pdb-compat-mode refers to this sort of area.