Re: [Gimp-developer] Enhanced smudge tool : Smudge with painting


sorry for replying so late, we're all at LGM and quite busy.

I really love that new way of smudge painting, we absolutely
want this in 2.10.

Could you perhaps do some cleanup to the patches?

- gimp_gegl_smudge_blend() and its parameters were renamed
  for (imo) no good reason

- variables should be declared at the start of a block

- we don't use c++ comments

Also, can you upload the patches to a new bug in bugzilla


On Fri, 2017-04-14 at 02:09 +0800, b91502038 ntu edu tw wrote:
Hi everyone. I did an experiment that enhanced the smudge tool, which
can not only smudge existing color on the canvas, but also blend
brush color on it. This is useful in digital painting.

Details and test drawings

It was not difficult to implement. Only 6 files were modified and had
no compatibility issues.

Current issues:

--Color from gradient and color brushes are not supported, only
foreground color can be used.
I can try to fix it.

--Doesn't support layer modes (multiply, screen, add, etc.)
It's difficult to implement because smudge tool calculates brush-to-
drawable blending by itself and calls
gimp_brush_core_replace_canvas(), unlike other brushes.
MyPaint brush doesn't support this either.
I don't think this is a true problem. Normal mode is enough in
practice. But I'm not sure other users' requirements.

--Have not modifird the relative script procedure
The "gimp-smudge" in Procedure Browser, I havn't added new parameters

An optional idea:

--"No erasing effect" may be implemented as a layer property, like
"Lock alpha channel", "Lock pixels" switches.
That is, for any operations effecting pixels' alpha
  now_alpha = MAX(updated_alpha, now_alpha);
  now_alpha = updated_alpha;
But I'm not sure the difficulty to implement and the usefulness.
As my experience, only smudge and MyPaint brush really need this.
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