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gimp/plug-ins/blur/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.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "libgimp/gimp.h"
#include "gtk/gtk.h"
#include <plug-ins/gpc/gpc.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/*********************************
*
* PLUGIN-SPECIFIC CONSTANTS
*
********************************/
/*
* progress meter update frequency
*/
#define PROG_UPDATE_TIME ((row % 10) == 0)
#define PLUG_IN_NAME "plug_in_blur"
#define BLUR_VERSION "Blur 2.0"
#define SEED_TIME 10
#define SEED_USER 11
#define ENTRY_WIDTH 75
#define SCALE_WIDTH 100
/*********************************
*
* PLUGIN-SPECIFIC STRUCTURES AND DATA
*
********************************/
typedef struct {
gdouble blur_pct; /* likelihood of randomization (as %age) */
gdouble blur_rcount; /* repeat count */
gint seed_type; /* seed init. type - current time or user value */
gint blur_seed; /* seed value for rand() function */
} BlurVals;
static BlurVals pivals = {
50.0,
1.0,
SEED_TIME,
0,
};
typedef struct {
gint run;
} BlurInterface;
static BlurInterface blur_int = {
FALSE /* have we run? */
};
/*********************************
*
* LOCAL FUNCTIONS
*
********************************/
static void query(void);
static void run(
char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals
);
GPlugInInfo PLUG_IN_INFO = {
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static void blur(GDrawable *drawable);
static inline void blur_prepare_row(
GPixelRgn *pixel_rgn,
guchar *data,
int x,
int y,
int w
);
static gint blur_dialog();
static void blur_ok_callback(
GtkWidget *widget,
gpointer data
);
/************************************ Guts ***********************************/
MAIN()
/*********************************
*
* query() - query_proc
*
* called by the GIMP to learn about this plug-in
*
********************************/
static void
query()
{
static GParamDef args_ni[] = {
{ PARAM_INT32, "run_mode", "non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
};
static int nargs_ni = sizeof(args_ni) / sizeof (args_ni[0]);
static GParamDef args[] = {
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_FLOAT, "blur_pct", "Randomization percentage (1 - 100)" },
{ PARAM_FLOAT, "blur_rcount", "Repeat count(1 - 100)" },
{ PARAM_INT32, "seed_type", "Seed type (10 = current time, 11 = seed value)" },
{ PARAM_INT32, "blur_seed", "Seed value (used only if seed type is 11)" },
};
static int nargs = sizeof(args) / sizeof (args[0]);
static GParamDef *return_vals = NULL;
static int nreturn_vals = 0;
const char *blurb = "Apply a 3x3 blurring convolution kernel to the specified drawable.";
const char *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 char *author = "Miles O'Neal <meo@rru.com> http://www.rru.com/~meo/";
const char *copyrights = "Miles O'Neal, Spencer Kimball, Peter Mattis, Torsten Martinsen, Brian Degenhardt, Federico Mena Quintero, Stephen Norris, Daniel Cotting";
const char *copyright_date = "1995-1998";
gimp_install_procedure("plug_in_blur_randomize",
(char *) blurb,
(char *) help,
(char *) author,
(char *) copyrights,
(char *) copyright_date,
"<Image>/Filters/Blur/Blur",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
gimp_install_procedure(PLUG_IN_NAME,
(char *) blurb,
(char *) help,
(char *) author,
(char *) copyrights,
(char *) copyright_date,
NULL,
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs_ni, nreturn_vals,
args_ni, return_vals);
}
/*********************************
*
* run() - main routine
*
* This handles the main interaction with the GIMP itself,
* and invokes the routine that actually does the work.
*
********************************/
static void
run(char *name, int nparams, GParam *param, int *nreturn_vals,
GParam **return_vals)
{
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS; /* assume the best! */
char prog_label[32];
static GParam values[1];
/*
* 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 = PARAM_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
/*
* Make sure the drawable type is appropriate.
*/
if (gimp_drawable_color(drawable->id) ||
gimp_drawable_gray(drawable->id)) {
switch (run_mode) {
/*
* If we're running interactively, pop up the dialog box.
*/
case 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 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.seed_type = (gint) param[5].data.d_int32;
pivals.seed_type = (gint) MIN(SEED_USER, param[5].data.d_int32);
pivals.seed_type = (gint) MAX(SEED_TIME, param[5].data.d_int32);
pivals.blur_seed = (gint) param[6].data.d_int32;
status = STATUS_SUCCESS;
} else if ((strcmp(name, PLUG_IN_NAME) == 0) &&
(nparams == 3)) {
pivals.blur_pct = (gdouble) 100.0;
pivals.blur_rcount = (gdouble) 1.0;
pivals.seed_type = SEED_TIME;
pivals.blur_seed = 0;
status = STATUS_SUCCESS;
} else {
status = STATUS_CALLING_ERROR;
}
break;
/*
* If we're running with the last set of values, get those values.
*/
case RUN_WITH_LAST_VALS:
gimp_get_data(PLUG_IN_NAME, &pivals);
break;
/*
* Hopefully we never get here!
*/
default:
break;
}
if (status == STATUS_SUCCESS) {
/*
* JUST DO IT!
*/
strcpy(prog_label, BLUR_VERSION);
gimp_progress_init(prog_label);
gimp_tile_cache_ntiles(2 * (drawable->width / gimp_tile_width() + 1));
/*
* Initialize the rand() function seed
*/
if (pivals.seed_type == SEED_TIME)
srand(time(NULL));
else
srand(pivals.blur_seed);
blur(drawable);
/*
* If we ran interactively (even repeating) update the display.
*/
if (run_mode != RUN_NONINTERACTIVE) {
gimp_displays_flush();
}
/*
* If we use the dialog popup, set the data for future use.
*/
if (run_mode == RUN_INTERACTIVE) {
gimp_set_data(PLUG_IN_NAME, &pivals, sizeof(BlurVals));
}
}
} else {
/*
* If we got the wrong drawable type, we need to complain.
*/
status = STATUS_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(GPixelRgn *pixel_rgn, guchar *data, int x, int y, int w)
{
int b;
if (y == 0) {
gimp_pixel_rgn_get_row(pixel_rgn, data, x, (y + 1), w);
} else if (y == pixel_rgn->h) {
gimp_pixel_rgn_get_row(pixel_rgn, data, x, (y - 1), w);
} else {
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(GDrawable *drawable)
{
GPixelRgn 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;
gint has_alpha, ind;
/*
* 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->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->id);
/*
* allocate row buffers
*/
prev_row = (guchar *) malloc((x2 - x1 + 2) * bytes);
cur_row = (guchar *) malloc((x2 - x1 + 2) * bytes);
next_row = (guchar *) malloc((x2 - x1 + 2) * bytes);
dest = (guchar *) malloc((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;
for (cnt = 1; cnt <= pivals.blur_rcount; 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 (((rand() % 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 < pivals.blur_rcount) {
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->id, TRUE);
gimp_drawable_update(drawable->id, x1, y1, (x2 - x1), (y2 - y1));
/*
* clean up after ourselves.
*/
free(prev_row);
free(cur_row);
free(next_row);
free(dest);
}
/*********************************
*
* GUI ROUTINES
*
********************************/
/*********************************
*
* blur_dialog() - set up the plug-in's dialog box
*
********************************/
static gint
blur_dialog()
{
GtkWidget *dlg, *entry, *frame,
*seed_hbox, *seed_vbox, *table;
GSList *seed_group = NULL;
gchar **argv;
gint argc;
gchar buffer[10];
/*
* various initializations
*/
gint do_time = (pivals.seed_type == SEED_TIME);
gint do_user = (pivals.seed_type == SEED_USER);
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("blur");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
/*
* Open a new dialog, label it and set up its
* destroy callback.
*/
dlg = gtk_dialog_new();
gtk_window_set_title(GTK_WINDOW(dlg), BLUR_VERSION);
gtk_window_position(GTK_WINDOW(dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect(GTK_OBJECT(dlg), "destroy",
(GtkSignalFunc) gpc_close_callback, NULL);
/*
* Parameter settings
*
* First set up the basic containers, label them, etc.
*/
frame = gtk_frame_new("Parameter Settings");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width(GTK_CONTAINER(frame), 10);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new(4, 2, FALSE);
gtk_container_border_width(GTK_CONTAINER(table), 10);
gtk_container_add(GTK_CONTAINER(frame), table);
gtk_widget_show(table);
gpc_setup_tooltips(table);
/*
* Action area OK & Cancel buttons
*/
gpc_add_action_button("OK", (GtkSignalFunc) blur_ok_callback, dlg,
"Accept settings and apply filter to image");
gpc_add_action_button("Cancel", (GtkSignalFunc) gpc_cancel_callback, dlg,
"Close plug-in without making any changes");
/*
* Randomization seed initialization controls
*/
gpc_add_label("Randomization Seed:", table, 0, 1, 1, 2);
/*
* Box to hold seed initialization radio buttons
*/
seed_vbox = gtk_vbox_new(FALSE, 2);
gtk_container_border_width(GTK_CONTAINER(seed_vbox), 5);
gtk_table_attach(GTK_TABLE(table), seed_vbox, 1, 2, 1, 2,
GTK_FILL | GTK_EXPAND, GTK_FILL, 5, 0);
/*
* Time button
*/
gpc_add_radio_button(&seed_group, "Current Time", seed_vbox, &do_time,
"Seed random number generator from the current time - this guarantees a reasonable randomization");
/*
* Box to hold seed user initialization controls
*/
seed_hbox = gtk_hbox_new(FALSE, 3);
gtk_container_border_width(GTK_CONTAINER(seed_hbox), 0);
gtk_box_pack_start(GTK_BOX(seed_vbox), seed_hbox, FALSE, FALSE, 0);
/*
* User button
*/
gpc_add_radio_button(&seed_group, "Other Value", seed_hbox, &do_user,
"Enable user-entered value for random number generator seed - this allows you to repeat a given \"random\" operation");
/*
* Randomization seed number (text)
*/
entry = gtk_entry_new();
gtk_widget_set_usize(entry, ENTRY_WIDTH, 0);
gtk_box_pack_start(GTK_BOX(seed_hbox), entry, FALSE, FALSE, 0);
sprintf(buffer, "%d", pivals.blur_seed);
gtk_entry_set_text(GTK_ENTRY(entry), buffer);
gtk_signal_connect(GTK_OBJECT(entry), "changed",
(GtkSignalFunc) gpc_text_update, &pivals.blur_seed);
gtk_widget_show(entry);
gpc_set_tooltip(entry, "Value for seeding the random number generator");
gtk_widget_show(seed_hbox);
/*
* Randomization percentage label & scale (1 to 100)
*/
gpc_add_label("Randomization %:", table, 0, 1, 2, 3);
gpc_add_hscale(table, SCALE_WIDTH,
1.0, 100.0, &pivals.blur_pct, 1, 2, 2, 3,
"Percentage of pixels to be filtered");
/*
* Repeat count label & scale (1 to 100)
*/
gpc_add_label("Repeat:", table, 0, 1, 3, 4);
gpc_add_hscale(table, SCALE_WIDTH,
1.0, 100.0, &pivals.blur_rcount, 1, 2, 3, 4,
"Number of times to apply filter");
/*
* Display everything.
*/
gtk_widget_show(frame);
gtk_widget_show(dlg);
gtk_main();
gdk_flush();
/*
* Figure out which type of seed initialization to apply.
*/
if (do_time) {
pivals.seed_type = SEED_TIME;
} else {
pivals.seed_type = SEED_USER;
}
return blur_int.run;
}
static void
blur_ok_callback(GtkWidget *widget, gpointer data) {
blur_int.run = TRUE;
gtk_widget_destroy(GTK_WIDGET(data));
}
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