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gimp/plug-ins/common/blur.c

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/****************************************************************************
* This is a plugin for the GIMP v 0.99.8 or later. Documentation is
* available at http://www.rru.com/~meo/gimp/ .
*
* Copyright (C) 1997-98 Miles O'Neal <meo@rru.com> http://www.rru.com/~meo/
* Blur code Copyright (C) 1995 Spencer Kimball and Peter Mattis
* GUI based on GTK code from:
* alienmap (Copyright (C) 1996, 1997 Daniel Cotting)
* plasma (Copyright (C) 1996 Stephen Norris),
* oilify (Copyright (C) 1996 Torsten Martinsen),
* ripple (Copyright (C) 1997 Brian Degenhardt) and
* whirl (Copyright (C) 1997 Federico Mena Quintero).
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Blur:
*
* blur version 2.0 (1 May 1998, MEO)
* history
* 2.0 - 1 May 1998 MEO
* based on randomize 1.7
*
* Please send any patches or suggestions to the author: meo@rru.com .
*
* Blur applies a 3x3 blurring convolution kernel to the specified drawable.
*
* For each pixel in the selection or image,
* whether to change the pixel is decided by picking a
* random number, weighted by the user's "randomization" percentage.
* If the random number is in range, the pixel is modified. For
* blurring, an average is determined from the current and adjacent
* pixels. *(Except for the random factor, the blur code came
* straight from the original S&P blur plug-in.)*
*
* This works only with RGB and grayscale images.
*
****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/*********************************
*
* PLUGIN-SPECIFIC CONSTANTS
*
********************************/
/*
* progress meter update frequency
*/
#define PROG_UPDATE_TIME ((row % 10) == 0)
#define PLUG_IN_NAME "plug_in_blur"
#define HELP_ID "plug-in-blur"
#define SEED_DEFAULT 10
#define SEED_USER 11
#define SCALE_WIDTH 100
/*********************************
*
* PLUGIN-SPECIFIC STRUCTURES AND DATA
*
********************************/
typedef struct
{
gdouble blur_pct; /* likelihood of randomization (as %age) */
gdouble blur_rcount; /* repeat count */
gboolean blur_randomize; /* Generate a random seed value */
guint blur_seed; /* seed value for g_random_set_seed() function */
} BlurVals;
static BlurVals pivals =
{
100.0,
1.0,
FALSE,
0
};
/*********************************
*
* LOCAL FUNCTIONS
*
********************************/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static void blur (GimpDrawable *drawable);
static inline void blur_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w);
static gint blur_dialog (void);
/************************************ Guts ***********************************/
MAIN ()
/*********************************
*
* query() - query_proc
*
* called by the GIMP to learn about this plug-in
*
********************************/
static void
query (void)
{
static GimpParamDef args_ni[] =
{
{ GIMP_PDB_INT32, "run_mode", "non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
};
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, "blur_pct", "Randomization percentage (1 - 100)" },
{ GIMP_PDB_FLOAT, "blur_rcount", "Repeat count(1 - 100)" },
{ GIMP_PDB_INT32, "randomize", "Use a random seed (TRUE, FALSE)" },
{ GIMP_PDB_INT32, "seed", "Seed value (used only if randomize is FALSE)" }
};
const gchar *blurb = "Apply a 3x3 blurring convolution kernel to the specified drawable.";
const gchar *help = "This plug-in randomly blurs the specified drawable, using a 3x3 blur. You control the percentage of the pixels that are blurred and the number of times blurring is applied. Indexed images are not supported.";
const gchar *author = "Miles O'Neal <meo@rru.com>";
const gchar *copyrights = "Miles O'Neal, Spencer Kimball, Peter Mattis, Torsten Martinsen, Brian Degenhardt, Federico Mena Quintero, Stephen Norris, Daniel Cotting";
const gchar *copyright_date = "1995-1998";
gimp_install_procedure ("plug_in_blur_randomize",
(gchar *) blurb,
(gchar *) help,
(gchar *) author,
(gchar *) copyrights,
(gchar *) copyright_date,
N_("<Image>/Filters/Blur/_Blur..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_install_procedure (PLUG_IN_NAME,
(gchar *) blurb,
(gchar *) help,
(gchar *) author,
(gchar *) copyrights,
(gchar *) copyright_date,
NULL,
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args_ni), 0,
args_ni, NULL);
}
/*********************************
*
* run() - main routine
*
* This handles the main interaction with the GIMP itself,
* and invokes the routine that actually does the work.
*
********************************/
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS; /* assume the best! */
static GimpParam values[1];
INIT_I18N ();
/*
* Get the specified drawable, do standard initialization.
*/
run_mode = param[0].data.d_int32;
drawable = gimp_drawable_get (param[2].data.d_drawable);
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
/*
* Make sure the drawable type is appropriate.
*/
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
switch (run_mode)
{
/*
* If we're running interactively, pop up the dialog box.
*/
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_NAME, &pivals);
if (! blur_dialog ()) /* return on Cancel */
return;
break;
/*
* If we're not interactive (probably scripting), we
* get the parameters from the param[] array, since
* we don't use the dialog box. Make sure all
* parameters have legitimate values.
*/
case GIMP_RUN_NONINTERACTIVE:
if ((strcmp (name, "plug_in_blur_randomize") == 0) &&
(nparams == 7))
{
pivals.blur_pct = (gdouble) param[3].data.d_float;
pivals.blur_pct = (gdouble) MIN (100.0, pivals.blur_pct);
pivals.blur_pct = (gdouble) MAX (1.0, pivals.blur_pct);
pivals.blur_rcount = (gdouble) param[4].data.d_float;
pivals.blur_rcount = (gdouble) MIN (100.0,pivals.blur_rcount);
pivals.blur_rcount = (gdouble) MAX (1.0, pivals.blur_rcount);
pivals.blur_randomize = (gboolean) param[5].data.d_int32;
pivals.blur_seed = (gint) param[6].data.d_int32;
if (pivals.blur_randomize)
pivals.blur_seed = g_random_int ();
}
else if ((strcmp (name, PLUG_IN_NAME) == 0) &&
(nparams == 3))
{
pivals.blur_pct = (gdouble) 100.0;
pivals.blur_rcount = (gdouble) 1.0;
pivals.blur_randomize = FALSE;
pivals.blur_seed = g_random_int ();
}
else
{
status = GIMP_PDB_CALLING_ERROR;
}
break;
/*
* If we're running with the last set of values, get those values.
*/
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_NAME, &pivals);
if (pivals.blur_randomize)
pivals.blur_seed = g_random_int ();
break;
/*
* Hopefully we never get here!
*/
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/*
* JUST DO IT!
*/
gimp_progress_init (_("Blurring..."));
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width ()
+ 1));
g_random_set_seed (pivals.blur_seed);
blur (drawable);
/*
* If we ran interactively (even repeating) update the display.
*/
if (run_mode != GIMP_RUN_NONINTERACTIVE)
{
gimp_displays_flush ();
}
/*
* If we use the dialog popup, set the data for future use.
*/
if (run_mode == GIMP_RUN_INTERACTIVE)
{
gimp_set_data (PLUG_IN_NAME, &pivals, sizeof (BlurVals));
}
}
}
else
{
/*
* If we got the wrong drawable type, we need to complain.
*/
status = GIMP_PDB_EXECUTION_ERROR;
}
/*
* DONE!
* Set the status where the GIMP can see it, and let go
* of the drawable.
*/
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/*********************************
*
* blur_prepare_row()
*
* Get a row of pixels. If the requested row
* is off the edge, clone the edge row.
*
********************************/
static inline void
blur_prepare_row (GimpPixelRgn *pixel_rgn,
guchar *data,
gint x,
gint y,
gint w)
{
int b;
y = CLAMP (y, 1, pixel_rgn->h - 1);
gimp_pixel_rgn_get_row (pixel_rgn, data, x, y, w);
/*
* Fill in edge pixels
*/
for (b = 0; b < pixel_rgn->bpp; b++)
{
data[-(gint)pixel_rgn->bpp + b] = data[b];
data[w * pixel_rgn->bpp + b] = data[(w - 1) * pixel_rgn->bpp + b];
}
}
/*********************************
*
* blur()
*
* Actually mess with the image.
*
********************************/
static void
blur (GimpDrawable *drawable)
{
GimpPixelRgn srcPR, destPR, destPR2, *sp, *dp, *tp;
gint width, height;
gint bytes;
guchar *dest, *d;
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *tmp;
gint row, col;
gint x1, y1, x2, y2;
gint cnt, ind;
gint repeat_count;
gboolean has_alpha;
/*
* Get the input area. This is the bounding box of the selection in
* the image (or the entire image if there is no selection). Only
* operating on the input area is simply an optimization. It doesn't
* need to be done for correct operation. (It simply makes it go
* faster, since fewer pixels need to be operated on).
*/
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
/*
* Get the size of the input image. (This will/must be the same
* as the size of the output image. Also get alpha info.
*/
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
/*
* allocate row buffers
*/
prev_row = g_new (guchar, (x2 - x1 + 2) * bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * bytes);
dest = g_new (guchar, (x2 - x1) * bytes);
/*
* initialize the pixel regions
*/
gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);
gimp_pixel_rgn_init (&destPR2, drawable, 0, 0, width, height, TRUE, TRUE);
sp = &srcPR;
dp = &destPR;
tp = NULL;
pr = prev_row + bytes;
cr = cur_row + bytes;
nr = next_row + bytes;
repeat_count = (gint) pivals.blur_rcount;
for (cnt = 1; cnt <= repeat_count; cnt++)
{
/*
* prepare the first row and previous row
*/
blur_prepare_row (sp, pr, x1, y1 - 1, (x2 - x1));
blur_prepare_row (dp, cr, x1, y1, (x2 - x1));
/*
* loop through the rows, applying the selected convolution
*/
for (row = y1; row < y2; row++)
{
/* prepare the next row */
blur_prepare_row (sp, nr, x1, row + 1, (x2 - x1));
d = dest;
ind = 0;
for (col = 0; col < (x2 - x1) * bytes; col++)
{
if (g_random_int_range (0, 100) <= (gint) pivals.blur_pct)
{
ind++;
if (ind == bytes || !has_alpha)
{
/*
* If no alpha channel,
* or if there is one and this is it...
*/
*d++ = ((gint) pr[col - bytes] + (gint) pr[col] +
(gint) pr[col + bytes] +
(gint) cr[col - bytes] + (gint) cr[col] +
(gint) cr[col + bytes] +
(gint) nr[col - bytes] + (gint) nr[col] +
(gint) nr[col + bytes]) / 9;
ind = 0;
}
else
{
/*
* otherwise we have an alpha channel,
* but this is a color channel
*/
*d++ = ((gint)
(((gdouble) (pr[col - bytes] * pr[col - ind])
+ (gdouble) (pr[col] * pr[col + bytes - ind])
+ (gdouble) (pr[col + bytes] * pr[col + 2*bytes - ind])
+ (gdouble) (cr[col - bytes] * cr[col - ind])
+ (gdouble) (cr[col] * cr[col + bytes - ind])
+ (gdouble) (cr[col + bytes] * cr[col + 2*bytes - ind])
+ (gdouble) (nr[col - bytes] * nr[col - ind])
+ (gdouble) (nr[col] * nr[col + bytes - ind])
+ (gdouble) (nr[col + bytes] * nr[col + 2*bytes - ind]))
/ ((gdouble) pr[col - ind]
+ (gdouble) pr[col + bytes - ind]
+ (gdouble) pr[col + 2*bytes - ind]
+ (gdouble) cr[col - ind]
+ (gdouble) cr[col + bytes - ind]
+ (gdouble) cr[col + 2*bytes - ind]
+ (gdouble) nr[col - ind]
+ (gdouble) nr[col + bytes - ind]
+ (gdouble) nr[col + 2*bytes - ind])));
}
/*
* Otherwise, this pixel was not selected for randomization,
* so use the current value.
*/
}
else
{
*d++ = (gint) cr[col];
}
}
/*
* Save the modified row, shuffle the row pointers, and every
* so often, update the progress meter.
*/
gimp_pixel_rgn_set_row (dp, dest, x1, row, (x2 - x1));
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if (PROG_UPDATE_TIME)
gimp_progress_update ((double) row / (double) (y2 - y1));
}
/*
* if we have more cycles to perform, swap the src and dest Pixel Regions
*/
if (cnt < repeat_count)
{
if (tp != NULL)
{
tp = dp;
dp = sp;
sp = tp;
}
else
{
tp = &srcPR;
sp = &destPR;
dp = &destPR2;
}
}
}
gimp_progress_update ((double) 100);
/*
* update the blurred region
*/
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
/*
* clean up after ourselves.
*/
g_free (prev_row);
g_free (cur_row);
g_free (next_row);
g_free (dest);
}
/*********************************
* GUI ROUTINES
********************************/
static gint
blur_dialog (void)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *label;
GtkWidget *seed_hbox;
GtkObject *adj;
gboolean run;
gimp_ui_init ("blur", FALSE);
dlg = gimp_dialog_new (_("Blur"), "blur",
NULL, 0,
gimp_standard_help_func, HELP_ID,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
/*
* Parameter settings
*
* First set up the basic containers, label them, etc.
*/
frame = gtk_frame_new (_("Parameter Settings"));
gtk_container_set_border_width (GTK_CONTAINER(frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG(dlg)->vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
/* Random Seed */
seed_hbox = gimp_random_seed_new (&pivals.blur_seed, &pivals.blur_randomize);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("_Random Seed:"), 1.0, 0.5,
seed_hbox, 1, TRUE);
gtk_label_set_mnemonic_widget (GTK_LABEL (label),
GIMP_RANDOM_SEED_SPINBUTTON (seed_hbox));
/*
* Randomization percentage label & scale (1 to 100)
*/
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("R_andomization %:"), SCALE_WIDTH, 0,
pivals.blur_pct, 1.0, 100.0, 1.0, 10.0, 0,
TRUE, 0, 0,
_("Percentage of pixels to be filtered"), NULL);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&pivals.blur_pct);
/*
* Repeat count label & scale (1 to 100)
*/
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("R_epeat:"), SCALE_WIDTH, 0,
pivals.blur_rcount, 1.0, 100.0, 1.0, 10.0, 0,
TRUE, 0, 0,
_("Number of times to apply filter"), NULL);
g_signal_connect (adj, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&pivals.blur_rcount);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
return run;
}
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