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/* Autostretch HSV 0.10 --- image filter plug-in for The Gimp image
* manipulation program
*
* Copyright (C) 1997 Scott Goehring
* Copyright (C) 1996 Federico Mena Quintero
*
* You can contact me at scott@poverty.bloomington.in.us
*
* 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 <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 autostretch_hsv (GimpDrawable *drawable);
static void indexed_autostretch_hsv (gint32 image_ID);
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" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
gimp_install_procedure ("plug_in_autostretch_hsv",
"Automatically stretch the contrast of the specified "
"drawable to cover all possible ranges.",
"This simple plug-in does an automatic contrast "
"stretch. For each channel in the image, it finds "
"the minimum and maximum values... it uses those "
"values to stretch the individual histograms to the "
"full contrast range. For some images it may do "
"just what you want; for others it may be total "
"crap :). This version differs from Contrast "
"Autostretch in that it works in HSV space, and "
"preserves hue.",
"Scott Goehring and Federico Mena Quintero",
"Scott Goehring and Federico Mena Quintero",
"1997",
N_("Stretch _HSV"),
"RGB*, INDEXED*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_autostretch_hsv",
"<Image>/Layer/Colors/Auto");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpRunMode run_mode;
gint32 image_ID;
INIT_I18N();
run_mode = param[0].data.d_int32;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
image_ID = param[1].data.d_image;
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Auto-Stretching HSV..."));
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
autostretch_hsv (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else if (gimp_drawable_is_indexed (drawable->drawable_id))
{
indexed_autostretch_hsv (image_ID);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
{
/* gimp_message ("autostretch_hsv: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
typedef struct {
double shi;
double slo;
double vhi;
double vlo;
} AutostretchData;
static void
find_max (guchar *src, gint bpp, AutostretchData *data)
{
double h, s, v;
gimp_rgb_to_hsv4(src, &h, &s, &v);
if (s > data->shi) data->shi = s;
if (s < data->slo) data->slo = s;
if (v > data->vhi) data->vhi = v;
if (v < data->vlo) data->vlo = v;
}
static void
autostretch_hsv_func (guchar *src, guchar *dest, gint bpp,
AutostretchData *data)
{
double h, s, v;
gimp_rgb_to_hsv4(src, &h, &s, &v);
if (data->shi != data->slo)
s = (s - data->slo) / (data->shi - data->slo);
if (data->vhi != data->vlo)
v = (v - data->vlo) / (data->vhi - data->vlo);
gimp_hsv_to_rgb4(dest, h, s, v);
if (bpp == 4)
dest[3] = src[3];
}
static void
indexed_autostretch_hsv (gint32 image_ID)
{
guchar *cmap;
AutostretchData data = {0.0, 1.0, 0.0, 1.0};
gint ncols, i;
cmap = gimp_image_get_colormap (image_ID, &ncols);
if (!cmap)
{
g_message (_("autostretch_hsv: cmap was NULL! Quitting...\n"));
gimp_quit ();
}
for (i = 0; i < ncols; i++)
{
find_max (&cmap[i * 3], 3, &data);
}
for (i = 0; i < ncols; i++)
{
autostretch_hsv_func (&cmap[i * 3], &cmap[i * 3], 3, &data);
}
gimp_image_set_colormap (image_ID, cmap, ncols);
}
static void
autostretch_hsv (GimpDrawable *drawable)
{
AutostretchData data = {0.0, 1.0, 0.0, 1.0};
gimp_rgn_iterate1 (drawable, 0 /* unused */, (GimpRgnFunc1) find_max, &data);
gimp_rgn_iterate2 (drawable, 0 /* unused */, (GimpRgnFunc2) autostretch_hsv_func,
&data);
}
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