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/*
* Value-Invert plug-in v1.1 by Adam D. Moss, adam@foxbox.org. 1999/02/27
*/
/* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <libgimp/gimp.h>
#include "libgimp/stdplugins-intl.h"
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void vinvert (GimpDrawable *drawable);
static void indexed_vinvert (gint32 image_ID);
static void vinvert_render_row (const guchar *src,
guchar *dest,
gint row_width,
gint bpp);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (used for indexed images)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
gimp_install_procedure ("plug_in_vinvert",
"Invert the 'value' component of an indexed/RGB "
"image in HSV colorspace",
"This function takes an indexed/RGB image and "
"inverts its 'value' in HSV space. The upshot of "
"this is that the color and saturation at any given "
"point remains the same, but its brightness is "
"effectively inverted. Quite strange. Sometimes "
"produces unpleasant color artifacts on images from "
"lossy sources (ie. JPEG).",
"Adam D. Moss (adam@foxbox.org)",
"Adam D. Moss (adam@foxbox.org)",
"27th March 1997",
N_("_Value Invert"),
"RGB*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_vinvert", "<Image>/Filters/Colors");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
gint32 image_ID;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpRunMode run_mode;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
image_ID = param[1].data.d_image;
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is indexed or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id))
{
if (run_mode != GIMP_RUN_NONINTERACTIVE)
{
INIT_I18N();
gimp_progress_init (_("Value Invert..."));
}
vinvert (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
if (gimp_drawable_is_indexed (drawable->drawable_id))
{
indexed_vinvert (image_ID);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
indexed_vinvert (gint32 image_ID)
{
guchar *cmap;
gint ncols;
cmap = gimp_image_get_colormap (image_ID, &ncols);
g_return_if_fail (cmap != NULL);
vinvert_render_row (cmap, cmap, ncols, 3);
gimp_image_set_colormap (image_ID, cmap, ncols);
g_free (cmap);
}
static void
vinvert_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data)
{
gint v1, v2, v3;
v1 = src[0];
v2 = src[1];
v3 = src[2];
gimp_rgb_to_hsv_int (&v1, &v2, &v3);
v3 = 255 - v3;
gimp_hsv_to_rgb_int (&v1, &v2, &v3);
dest[0] = v1;
dest[1] = v2;
dest[2] = v3;
if (bpp == 4)
dest[3] = src[3];
}
static void
vinvert_render_row (const guchar *src,
guchar *dest,
gint row_width, /* in pixels */
gint bpp)
{
while (row_width--)
{
vinvert_func (src, dest, bpp, NULL);
src += bpp;
dest += bpp;
}
}
static void
vinvert (GimpDrawable *drawable)
{
gimp_rgn_iterate2 (drawable, 0 /* unused */, vinvert_func, NULL);
}
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