gimp/app/gimpdrawable-invert.c

163 lines
4.0 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "drawable.h"
#include "interface.h"
#include "invert.h"
#include "gimage.h"
#include "gimplut.h"
#include "libgimp/gimpintl.h"
static void invert (GimpDrawable *);
static Argument * invert_invoker (Argument *);
void
image_invert (GImage *gimage)
{
GimpDrawable *drawable;
Argument *return_vals;
int nreturn_vals;
drawable = gimage_active_drawable (gimage);
if (drawable_indexed (drawable))
{
g_message (_("Invert does not operate on indexed drawables."));
return;
}
return_vals = procedural_db_run_proc ("gimp_invert",
&nreturn_vals,
PDB_DRAWABLE, drawable_ID (drawable),
PDB_END);
if (return_vals[0].value.pdb_int != PDB_SUCCESS)
g_message (_("Invert operation failed."));
procedural_db_destroy_args (return_vals, nreturn_vals);
}
static float
invert_lut_func(void *unused,
int nchannels, int channel, float value)
{
/* don't invert the alpha channel */
if ((nchannels == 2 || nchannels == 4) && channel == nchannels -1)
return value;
return 1.0 - value;
}
/* Inverter */
static void
invert (GimpDrawable *drawable)
{
PixelRegion srcPR, destPR;
int x1, y1, x2, y2;
GimpLut *lut;
lut = gimp_lut_new();
gimp_lut_setup_exact(lut, (GimpLutFunc) invert_lut_func,
(void *) NULL, gimp_drawable_bytes(drawable));
drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
pixel_region_init (&srcPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, drawable_shadow (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
pixel_regions_process_parallel((p_func)gimp_lut_process, lut,
2, &srcPR, &destPR);
gimp_lut_free(lut);
drawable_merge_shadow (drawable, TRUE);
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
}
/* The invert procedure definition */
ProcArg invert_args[] =
{
{ PDB_DRAWABLE,
"drawable",
"the drawable"
}
};
ProcRecord invert_proc =
{
"gimp_invert",
"Invert the contents of the specified drawable",
"This procedure inverts the contents of the specified drawable. Each intensity channel is inverted independently. The inverted intensity is given as inten' = (255 - inten). Indexed color drawables are not valid for this operation.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
PDB_INTERNAL,
/* Input arguments */
1,
invert_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { invert_invoker } },
};
static Argument *
invert_invoker (args)
Argument *args;
{
int success = TRUE;
int int_value;
GImage *gimage;
GimpDrawable *drawable;
drawable = NULL;
/* the drawable */
if (success)
{
int_value = args[0].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL)
success = FALSE;
else
gimage = drawable_gimage (drawable);
}
/* make sure the drawable is not indexed color */
if (success)
success = ! drawable_indexed (drawable);
if (success)
invert (drawable);
return procedural_db_return_args (&invert_proc, success);
}