Re: [Gimp-developer] Fwd: gimp drawable question

["Joao S. O. Bueno" <gwidion mpc com br>]

On 23 April 2013 11:51, Tibor Bamhor <tiborb95 gmail com> wrote:
> Hi,
>
> after some digging and coding I found that the problem is bit different, so
> please ignore description in my above mail...
>
> The problem currently is (and I noticed also by other plugins of mine) that
> the image is not refreshed automatically - I have to click on the "eye" in
> the layers window to get it refreshed. Do I need to add something to my code
> in previous mail?

Try just making a call to "gimp_displays_flush" after  you are done.
> I can post a video if this is not clear :)
>
>
> Tibor
>
>
> ---------- Forwarded message ----------
> From: Tibor Bamhor <tiborb95 gmail com>
> Date: 2013/4/23
> Subject: gimp drawable question
> To: gimp-developer-list gnome org
>
>
> Hi,
>
> I am working on a plugin and need a help with understanding how drawables
> works.
>
> I would first describe what the plugin should do:
> 1. You open an image (lets presume the image is single layered)
> 2. User launches a plugin, it reads content of image and keep it in memory
> 3. User paints something to the image and hits a button on the plugin window
> (plugin stays alive all the time)
> 4. The plugin will read content from image, do some calculations and changes
> the image back.
>
> And steps 3 are 4 are repeated many times.
>
> First issue I run into is that when I want to paint (with paintbrush tool
> f.e.) to the image again,  what I had painted in previous iteration is lost
> - it dissapears... This is my question for now, how to avoid this
> behaviour...
>
> If I shoud provide some code, my "core" function that is called everytime
> the button is hit contains following....
>
> gimp_pixel_rgn_init (&rgn_in, source,x1, y1, maindata.width,
> maindata.height,FALSE, FALSE);
> gimp_pixel_rgn_init (&rgn_out, source, x1, y1, maindata.width,
> maindata.height, FALSE,TRUE);
>
> gimp_pixel_rgn_get_rect (&rgn_in,rect_in,x1,
> y1,maindata.width,maindata.height);
> #here plugin calculates rect_out
> gimp_pixel_rgn_set_rect (&rgn_out, rect_out,x1,
> y1,maindata.width,maindata.height);
>
> gimp_drawable_flush (source);
> gimp_drawable_merge_shadow (source->drawable_id, FALSE);
> gimp_drawable_update
> (source->drawable_id,x1,y1,maindata.width,maindata.height);
>
> I had read your Gimp reference manual but to no avail :)
>
> Thanks !!
>
> Tibor
>
>
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