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gimp/plug-ins/common/smooth-palette.c

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/*
* smooth palette - derive smooth palette from image
* Copyright (C) 1997 Scott Draves <spot@cs.cmu.edu>
*
* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-smooth-palette"
#define PLUG_IN_BINARY "smooth-palette"
/* 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 gboolean dialog (GimpDrawable *drawable);
static gint32 smooth_palette (GimpDrawable *drawable,
gint32 *layer_id);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "width", "Width" },
{ GIMP_PDB_INT32, "height", "Height" },
{ GIMP_PDB_INT32, "ntries", "Search Depth" },
{ GIMP_PDB_INT32, "show-image", "Show Image?" }
};
static const GimpParamDef return_vals[] =
{
{ GIMP_PDB_IMAGE, "new-image", "Output image" },
{ GIMP_PDB_LAYER, "new-layer", "Output layer" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Derive a smooth color palette from the image"),
"help!",
"Scott Draves",
"Scott Draves",
"1997",
N_("Smoo_th Palette..."),
"RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), G_N_ELEMENTS (return_vals),
args, return_vals);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Colors/Info");
}
static struct
{
gint width;
gint height;
gint ntries;
gint try_size;
gint show_image;
} config =
{
256,
64,
50,
10000,
1
};
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[3];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 3;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
values[1].type = GIMP_PDB_IMAGE;
values[2].type = GIMP_PDB_LAYER;
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &config);
if (! dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 7)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
config.width = param[3].data.d_int32;
config.height = param[4].data.d_int32;
config.ntries = param[5].data.d_int32;
config.show_image = param[6].data.d_int32 ? TRUE : FALSE;
}
if (status == GIMP_PDB_SUCCESS &&
((config.width <= 0) || (config.height <= 0) || config.ntries <= 0))
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &config);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
if (gimp_drawable_is_rgb (drawable->drawable_id))
{
gimp_progress_init (_("Deriving smooth palette"));
gimp_tile_cache_ntiles (2 * (drawable->width + 1) /
gimp_tile_width ());
values[1].data.d_image = smooth_palette (drawable,
&values[2].data.d_layer);
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &config, sizeof (config));
if (config.show_image)
gimp_display_new (values[1].data.d_image);
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
gimp_drawable_detach (drawable);
}
values[0].data.d_status = status;
}
static long
pix_diff (guchar *pal,
guint bpp,
gint i,
gint j)
{
glong r = 0;
guint k;
for (k = 0; k < bpp; k++)
{
gint p1 = pal[j * bpp + k];
gint p2 = pal[i * bpp + k];
r += (p1 - p2) * (p1 - p2);
}
return r;
}
static void
pix_swap (guchar *pal,
guint bpp,
gint i,
gint j)
{
guint k;
for (k = 0; k < bpp; k++)
{
guchar t = pal[j * bpp + k];
pal[j * bpp + k] = pal[i * bpp + k];
pal[i * bpp + k] = t;
}
}
static gint32
smooth_palette (GimpDrawable *drawable,
gint32 *layer_id)
{
gint32 new_image_id;
GimpDrawable *new_layer;
gint psize, i, j;
guchar *pal;
guint bpp = drawable->bpp;
gint sel_x1, sel_x2, sel_y1, sel_y2;
gint width, height;
GimpPixelRgn pr;
GRand *gr;
gr = g_rand_new ();
new_image_id = gimp_image_new (config.width, config.height, GIMP_RGB);
gimp_image_undo_disable (new_image_id);
*layer_id = gimp_layer_new (new_image_id, _("Background"),
config.width, config.height,
gimp_drawable_type (drawable->drawable_id),
100, GIMP_NORMAL_MODE);
gimp_image_add_layer (new_image_id, *layer_id, 0);
new_layer = gimp_drawable_get (*layer_id);
psize = config.width;
pal = g_new (guchar, psize * bpp);
gimp_drawable_mask_bounds (drawable->drawable_id,
&sel_x1, &sel_y1, &sel_x2, &sel_y2);
width = sel_x2 - sel_x1;
height = sel_y2 - sel_y1;
gimp_pixel_rgn_init (&pr, drawable, sel_x1, sel_y1, width, height,
FALSE, FALSE);
/* get initial palette */
for (i = 0; i < psize; i++)
{
gint x = sel_x1 + g_rand_int_range (gr, 0, width);
gint y = sel_y1 + g_rand_int_range (gr, 0, height);
gimp_pixel_rgn_get_pixel (&pr, pal + bpp * i, x, y);
}
/* reorder */
if (1)
{
guchar *pal_best;
guchar *original;
gdouble len_best = 0;
gint try;
pal_best = g_memdup (pal, bpp * psize);
original = g_memdup (pal, bpp * psize);
for (try = 0; try < config.ntries; try++)
{
gdouble len;
if (!(try%5))
gimp_progress_update (try / (double) config.ntries);
memcpy (pal, original, bpp * psize);
/* scramble */
for (i = 1; i < psize; i++)
pix_swap (pal, bpp, i, g_rand_int_range (gr, 0, psize));
/* measure */
len = 0.0;
for (i = 1; i < psize; i++)
len += pix_diff (pal, bpp, i, i-1);
/* improve */
for (i = 0; i < config.try_size; i++)
{
gint i0 = 1 + g_rand_int_range (gr, 0, psize-2);
gint i1 = 1 + g_rand_int_range (gr, 0, psize-2);
glong as_is, swapd;
if (1 == (i0 - i1))
{
as_is = (pix_diff (pal, bpp, i1 - 1, i1) +
pix_diff (pal, bpp, i0, i0 + 1));
swapd = (pix_diff (pal, bpp, i1 - 1, i0) +
pix_diff (pal, bpp, i1, i0 + 1));
}
else if (1 == (i1 - i0))
{
as_is = (pix_diff (pal, bpp, i0 - 1, i0) +
pix_diff (pal, bpp, i1, i1 + 1));
swapd = (pix_diff (pal, bpp, i0 - 1, i1) +
pix_diff (pal, bpp, i0, i1 + 1));
}
else
{
as_is = (pix_diff (pal, bpp, i0, i0 + 1) +
pix_diff (pal, bpp, i0, i0 - 1) +
pix_diff (pal, bpp, i1, i1 + 1) +
pix_diff (pal, bpp, i1, i1 - 1));
swapd = (pix_diff (pal, bpp, i1, i0 + 1) +
pix_diff (pal, bpp, i1, i0 - 1) +
pix_diff (pal, bpp, i0, i1 + 1) +
pix_diff (pal, bpp, i0, i1 - 1));
}
if (swapd < as_is)
{
pix_swap (pal, bpp, i0, i1);
len += swapd - as_is;
}
}
/* best? */
if (0 == try || len < len_best)
{
memcpy (pal_best, pal, bpp * psize);
len_best = len;
}
}
memcpy (pal, pal_best, bpp * psize);
g_free (pal_best);
g_free (original);
/* clean */
for (i = 1; i < 4 * psize; i++)
{
glong as_is, swapd;
gint i0 = 1 + g_rand_int_range (gr, 0, psize - 2);
gint i1 = i0 + 1;
as_is = (pix_diff (pal, bpp, i0 - 1, i0) +
pix_diff (pal, bpp, i1, i1 + 1));
swapd = (pix_diff (pal, bpp, i0 - 1, i1) +
pix_diff (pal, bpp, i0, i1 + 1));
if (swapd < as_is)
{
pix_swap (pal, bpp, i0, i1);
len_best += swapd - as_is;
}
}
}
/* store smooth palette */
gimp_pixel_rgn_init (&pr, new_layer, 0, 0,
config.width, config.height,
TRUE, FALSE);
for (j = 0; j < config.height; j++)
for (i = 0; i < config.width; i++)
gimp_pixel_rgn_set_pixel (&pr, pal + bpp * i, i, j);
g_free (pal);
g_rand_free (gr);
gimp_drawable_flush (new_layer);
gimp_drawable_update(new_layer->drawable_id, 0, 0,
config.width, config.height);
gimp_image_undo_enable (new_image_id);
return new_image_id;
}
static gboolean
dialog (GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *spinbutton;
GtkObject *adj;
GtkWidget *sizeentry;
guint32 image_id;
GimpUnit unit;
gdouble xres, yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dlg = gimp_dialog_new (_("Smooth Palette"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dlg),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dlg));
image_id = gimp_drawable_get_image (drawable->drawable_id);
unit = gimp_image_get_unit (image_id);
gimp_image_get_resolution (image_id, &xres, &yres);
sizeentry = gimp_coordinates_new (unit, "%a", TRUE, FALSE, 6,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
FALSE, FALSE,
_("_Width:"),
config.width, xres,
2, GIMP_MAX_IMAGE_SIZE,
2, GIMP_MAX_IMAGE_SIZE,
_("_Height:"),
config.height, yres,
1, GIMP_MAX_IMAGE_SIZE,
1, GIMP_MAX_IMAGE_SIZE);
gtk_container_set_border_width (GTK_CONTAINER (sizeentry), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dlg))),
sizeentry, FALSE, FALSE, 0);
gtk_widget_show (sizeentry);
spinbutton = gimp_spin_button_new (&adj, config.ntries,
1, 1024, 1, 10, 0, 1, 0);
gimp_table_attach_aligned (GTK_TABLE (sizeentry), 0, 2,
_("_Search depth:"), 0.0, 0.5,
spinbutton, 1, FALSE);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&config.ntries);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
if (run)
{
config.width = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry),
0);
config.height = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry),
1);
}
gtk_widget_destroy (dlg);
return run;
}
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