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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