Okay, one more bit of help should finish this. :-)

On Sun, 2009-05-31 at 11:50 +1000, David Hodson wrote:
> On Sat, 2009-05-30 at 20:47 -0400, Adam C Powell IV wrote:
> > I'm sorry, I'm developing a C plugin (tried Scheme first and it was DOG
> > slow).  Is there a C equivalent?  All I'm seeing is
> > gimp-paintbrush-register.
> Open Gimp
> Select Help > Procedure Browser
> In the search box, type "brush"
> Click on "gimp-context-set-brush"
> Read the documentation
> In your plugin, add the line:
> gboolean result = gimp_context_set_brush("Circle (01)");
> Rinse, lather, repeat.
> (The hardest part is changing the dashes in the name to underscores.)

Thanks very much, this and Rob's sequence got me almost there.  And
apologies to Rob, Liam and Sven for missing this post on Scheme -> C
procedure names until after my Sunday replies.

But using gimp_pencil (drawable_ID, etc.) in C only draws on the main
window.  I want it to draw on the preview or window as appropriate.

Here's my function in a nutshell:

  if (!(drawable = (GimpDrawable *) gimp_drawable_get (drawable_ID)))
    return FALSE;
  has_selection = gimp_drawable_mask_bounds (drawable_ID,
                                             &x1, &y1, &x2, &y2);

  if (!(source_data = g_new (guchar, drawable->bpp * (x2-x1) * (y2-y1))))
    return FALSE;
  gimp_pixel_rgn_init (&source_region, drawable, x1, y1, x2-x1, y2-y1, FALSE,
  gimp_pixel_rgn_get_rect (&source_region, source_data, x1, y1, x2-x1, y2-y1);

  // Do some stuff to source_data

  gimp_pixel_rgn_init (&output_region, drawable, x1, y1, x2-x1, y2-y1,
                       (preview == NULL), TRUE);

    (&output_region, source_data + y1*rowskip, 0, y1,
     full_width, y2-y1);

  // I want to draw the lines here

  if (preview)
    gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
      gimp_drawable_flush (drawable);
      gimp_drawable_merge_shadow (bs_param->drawable_ID, TRUE);
      gimp_drawable_update (bs_param->drawable_ID, x1, y1, win_width, 

This is called by both the "invalidated" callback of the preview in the
dialog, and also the run() method of the plugin after "OK".

The first non-lines part works fine: the changes to source_data get
merged into the preview when it's running, and into the original image
when I click "OK".

However, it draws the lines on the original image when the preview is
running in the dialog.  So that messes up the image analysis (Do some
stuff... above) when that runs at the end of run().  And
gimp_pixel_rgn_set_rect overwrites the lines, so they're all gone.

How can I get this to behave like gimp_pixel_rgn_set_rect , i.e. draw on
the preview in preview mode, and draw on the original window in run() ?
Can I draw the lines into the output_region somehow?

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Engineering consulting with open source tools

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