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gimp/plug-ins/common/sel_gauss.c

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/* Selective gaussian blur filter for the GIMP, version 0.1
* Adapted from the original gaussian blur filter by Spencer Kimball and
* Peter Mattis.
*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1999 Thom van Os <thom@vanos.com>
*
* 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.
*
* To do:
* - support for horizontal or vertical only blur
* - use memory more efficiently, smaller regions at a time
* - integrating with other convolution matrix based filters ?
* - create more selective and adaptive filters
* - threading
* - optimization
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
typedef struct
{
gdouble radius;
gint maxdelta;
gboolean update_preview;
} BlurValues;
/* 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 sel_gauss (GimpDrawable *drawable,
gdouble radius,
gint maxdelta);
static gboolean sel_gauss_dialog (GimpDrawable *drawable);
static void preview_update (GimpPreview *preview);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static BlurValues bvals =
{
5.0, /* radius */
50, /* maxdelta */
TRUE /* update_preview */
};
MAIN ()
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "radius", "Radius of gaussian blur (in pixels, > 0.0)" },
{ GIMP_PDB_INT32, "maxdelta", "Maximum delta" }
};
gimp_install_procedure ("plug_in_sel_gauss",
"Applies a selective gaussian blur to the "
"specified drawable.",
"This filter functions similar to the regular "
"gaussian blur filter except that neighbouring "
"pixels that differ more than the given maxdelta "
"parameter will not be blended with. This way with "
"the correct parameters, an image can be smoothed "
"out without losing details. However, this filter "
"can be rather slow.",
"Thom van Os",
"Thom van Os",
"1999",
N_("_Selective Gaussian Blur..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_sel_gauss", "<Image>/Filters/Blur");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
gdouble radius;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
INIT_I18N ();
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);
gimp_tile_cache_ntiles (2 * drawable->ntile_cols);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_sel_gauss", &bvals);
/* First acquire information with a dialog */
if (! sel_gauss_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
bvals.radius = param[3].data.d_float;
bvals.maxdelta = CLAMP (param[4].data.d_int32, 0, 255);
if (bvals.radius <= 0.0)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_sel_gauss", &bvals);
break;
default:
break;
}
if (status != GIMP_PDB_SUCCESS)
{
values[0].data.d_status = status;
return;
}
/* 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 (_("Selective Gaussian Blur..."));
radius = fabs (bvals.radius) + 1.0;
/* run the gaussian blur */
sel_gauss (drawable, radius, bvals.maxdelta);
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_sel_gauss",
&bvals, sizeof (BlurValues));
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
{
gimp_message (_("Cannot operate on indexed color images."));
status = GIMP_PDB_EXECUTION_ERROR;
}
gimp_drawable_detach (drawable);
values[0].data.d_status = status;
}
static gboolean
sel_gauss_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkWidget *spinbutton;
GtkObject *adj;
gboolean run;
gimp_ui_init ("sel_gauss", FALSE);
dialog = gimp_dialog_new (_("Selective Gaussian Blur"), "sel_gauss",
NULL, 0,
gimp_standard_help_func, "plug-in-sel-gauss",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, &bvals.update_preview);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect (preview, "invalidated",
G_CALLBACK (preview_update),
NULL);
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
spinbutton = gimp_spin_button_new (&adj,
bvals.radius, 0.0, G_MAXINT, 1.0, 5.0,
0, 1, 2);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("_Blur radius:"), 0.0, 0.5,
spinbutton, 1, TRUE);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&bvals.radius);
g_signal_connect_swapped (spinbutton, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Max. delta:"), 128, 0,
bvals.maxdelta, 0, 255, 1, 8, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&bvals.maxdelta);
g_signal_connect_swapped (adj, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
init_matrix (gdouble radius,
gdouble **mat,
gint num)
{
gint dx, dy;
gdouble sd, c1, c2;
/* This formula isn't really correct, but it'll do */
sd = radius / 3.329042969;
c1 = 1.0 / sqrt (2.0 * G_PI * sd);
c2 = -2.0 * (sd * sd);
for (dy = 0; dy < num; dy++)
{
for (dx = dy; dx < num; dx++)
{
mat[dx][dy] = c1 * exp ((dx * dx + dy * dy)/ c2);
mat[dy][dx] = mat[dx][dy];
}
}
}
static void
matrixmult (guchar *src,
guchar *dest,
gint width,
gint height,
gdouble **mat,
gint numrad,
gint bytes,
gboolean has_alpha,
gint maxdelta,
gboolean preview_mode)
{
gint i, j, b, nb, x, y;
gint six, dix, tmp;
gint rowstride;
gdouble sum, fact, d, alpha = 1.0;
guchar *src_b, *src_db;
gdouble *m;
gint offset;
nb = bytes - (has_alpha ? 1 : 0);
rowstride = width * bytes;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
dix = bytes * (width * y + x);
if (has_alpha)
dest[dix + nb] = src[dix + nb];
for (b = 0; b < nb; b++)
{
sum = 0.0;
fact = 0.0;
src_db = src + dix + b;
offset = rowstride * (y - numrad) + bytes * (x - numrad);
for (i = 1 - numrad; i < numrad; i++)
{
offset += bytes;
if (x + i < 0 || x + i >= width)
continue;
six = offset;
m = mat[ABS(i)];
src_b = src + six + b;
for (j = 1 - numrad; j < numrad; j++)
{
src_b += rowstride;
six += rowstride;
if (y + j < 0 || y + j >= height)
continue;
tmp = *src_db - *src_b;
if (tmp > maxdelta || tmp < -maxdelta)
continue;
d = m[ABS(j)];
if (has_alpha)
{
if (!src[six + nb])
continue;
alpha = (double) src[six + nb] / 255.0;
d *= alpha;
}
sum += d * *src_b;
fact += d;
}
}
if (fact == 0.0)
dest[dix + b] = *src_db;
else
dest[dix + b] = sum / fact;
}
}
if (!(y % 10) && !preview_mode)
gimp_progress_update ((double)y / (double)height);
}
}
static void
sel_gauss (GimpDrawable *drawable,
gdouble radius,
gint maxdelta)
{
GimpPixelRgn src_rgn, dest_rgn;
gint width, height;
gint bytes;
gboolean has_alpha;
guchar *dest;
guchar *src;
gint x1, y1, x2, y2;
gint i;
gdouble **mat;
gint numrad;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = x2 - x1;
height = y2 - y1;
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
numrad = (gint) (radius + 1.0);
mat = g_new (gdouble *, numrad);
for (i = 0; i < numrad; i++)
mat[i] = g_new (gdouble, numrad);
init_matrix(radius, mat, numrad);
src = g_new (guchar, width * height * bytes);
dest = g_new (guchar, width * height * bytes);
gimp_pixel_rgn_init (&src_rgn,
drawable, x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_get_rect (&src_rgn, src, x1, y1, width, height);
matrixmult (src, dest, width, height, mat, numrad,
bytes, has_alpha, maxdelta, FALSE);
gimp_pixel_rgn_init (&dest_rgn,
drawable, x1, y1, width, height, TRUE, TRUE);
gimp_pixel_rgn_set_rect (&dest_rgn, dest, x1, y1, width, height);
/* merge the shadow, update the drawable */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
/* free up buffers */
g_free (src);
g_free (dest);
for (i = 0; i < numrad; i++)
g_free (mat[i]);
g_free (mat);
}
static void
preview_update (GimpPreview *preview)
{
GimpDrawable *drawable;
glong bytes;
gint x1, y1;
guchar *render_buffer; /* Buffer to hold rendered image */
gint width; /* Width of preview widget */
gint height; /* Height of preview widget */
GimpPixelRgn srcPR; /* Pixel region */
guchar *src;
gboolean has_alpha;
gint numrad, i;
gdouble **mat;
gdouble radius;
/* Get drawable info */
drawable =
gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));
bytes = drawable->bpp;
/*
* Setup for filter...
*/
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
/* initialize pixel regions */
gimp_pixel_rgn_init (&srcPR, drawable,
x1, y1, width, height,
FALSE, FALSE);
render_buffer = g_new (guchar, width * height * bytes);
src = g_new (guchar, width * height * bytes);
/* render image */
gimp_pixel_rgn_get_rect (&srcPR, src, x1, y1, width, height);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
radius = fabs (bvals.radius) + 1.0;
numrad = (gint) (radius + 1.0);
mat = g_new (gdouble *, numrad);
for (i = 0; i < numrad; i++)
mat[i] = g_new (gdouble, numrad);
init_matrix(radius, mat, numrad);
matrixmult (src, render_buffer,
width, height,
mat, numrad,
bytes, has_alpha, bvals.maxdelta, TRUE);
for (i = 0; i < numrad; i++)
g_free (mat[i]);
g_free (mat);
g_free (src);
/*
* Draw the preview image on the screen...
*/
gimp_preview_draw_buffer (preview, render_buffer, width * bytes);
g_free (render_buffer);
}
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