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gimp/plug-ins/common/mblur.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Motion Blur plug-in for GIMP 0.99
* Copyright (C) 1997 Daniel Skarda (0rfelyus@atrey.karlin.mff.cuni.cz)
*
* This plug-in is port of Motion Blur plug-in for GIMP 0.54 by
* Thorsten Martinsen
* Copyright (C) 1996 Torsten Martinsen <torsten@danbbs.dk>
* Bresenham algorithm stuff hacked from HP2xx written by
* Heinz W. Werntges
* Changes for version 1.11/1.12 Copyright (C) 1996 Federico Mena Quintero
* quartic@polloux.fciencias.unam.mx
*
* I also used some code from Whirl and Pinch plug-in by Federico Mena Quintero
* (federico@nuclecu.unam.mx)
*
* 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.
*/
/* Version 1.2
*
* Everything is new - no changes
*
* TODO:
* Bilinear interpolation from original mblur for 0.54
* Speed all things up
* ? better caching scheme
* - while bluring along long trajektory do not averrage all
* pixels but averrage only few samples
* Function for weight of samples along trajectory
* Preview
* Support paths in GiMP 1.1 :-)
* Smash all bugs :-)
*/
#include "config.h"
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_NAME "plug_in_mblur"
#define PLUG_IN_VERSION "Sep 1997, 1.2"
#define HELP_ID "plug-in-mblur"
#define MBLUR_LINEAR 0
#define MBLUR_RADIAL 1
#define MBLUR_ZOOM 2
#define MBLUR_MAX MBLUR_ZOOM
typedef struct
{
gint32 mblur_type;
gint32 length;
gint32 angle;
} mblur_vals_t;
/***** Prototypes *****/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void mblur (void);
static void mblur_linear (void);
static void mblur_radial (void);
static void mblur_zoom (void);
static gboolean mblur_dialog (void);
/***** Variables *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run /* run_proc */
};
static mblur_vals_t mbvals =
{
MBLUR_LINEAR, /* mblur_type */
5, /* length */
45 /* radius */
};
static GimpDrawable *drawable;
static GtkObject *length, *angle;
static gint img_width, img_height, img_bpp;
static gint sel_x1, sel_y1, sel_x2, sel_y2;
static gint sel_width, sel_height;
static gint has_alpha;
static double cen_x, cen_y;
/***** Functions *****/
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_PDB_INT32, "type", "Type of motion blur (0 - linear, 1 - radial, 2 - zoom)" },
{ GIMP_PDB_INT32, "length", "Length" },
{ GIMP_PDB_INT32, "angle", "Angle" }
};
gimp_install_procedure (PLUG_IN_NAME,
"Motion blur of image",
"This plug-in simulates the effect seen when "
"photographing a moving object at a slow shutter "
"speed. Done by adding multiple displaced copies.",
"Torsten Martinsen, Federico Mena Quintero and Daniel Skarda",
"Torsten Martinsen, Federico Mena Quintero and Daniel Skarda",
PLUG_IN_VERSION,
N_("_Motion Blur..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_NAME,
N_("<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;
INIT_I18N ();
status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the active drawable info */
drawable = gimp_drawable_get (param[2].data.d_drawable);
img_width = gimp_drawable_width (drawable->drawable_id);
img_height = gimp_drawable_height (drawable->drawable_id);
img_bpp = gimp_drawable_bpp (drawable->drawable_id);
gimp_drawable_mask_bounds (drawable->drawable_id,
&sel_x1, &sel_y1, &sel_x2, &sel_y2);
/* Calculate scaling parameters */
sel_width = sel_x2 - sel_x1;
sel_height = sel_y2 - sel_y1;
cen_x = (gdouble) (sel_x1 + sel_x2 - 1) / 2.0;
cen_y = (gdouble) (sel_y1 + sel_y2 - 1) / 2.0;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_NAME, &mbvals);
/* Get information from the dialog */
if (!mblur_dialog())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are present */
if (nparams != 6)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
mbvals.mblur_type = param[3].data.d_int32;
mbvals.length = param[4].data.d_int32;
mbvals.angle = param[5].data.d_int32;
}
if ((mbvals.mblur_type < 0) && (mbvals.mblur_type > MBLUR_ZOOM))
status= GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_NAME, &mbvals);
break;
default:
break;
}
/* Blur the image */
if ((status == GIMP_PDB_SUCCESS) &&
(gimp_drawable_is_rgb(drawable->drawable_id) ||
gimp_drawable_is_gray(drawable->drawable_id)))
{
/* Set the tile cache size */
gimp_tile_cache_ntiles (2 * (drawable->width +
gimp_tile_width () - 1) / gimp_tile_width ());
/* Run! */
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
mblur ();
/* If run mode is interactive, flush displays */
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_NAME, &mbvals, sizeof(mblur_vals_t));
}
else if (status == GIMP_PDB_SUCCESS)
status = GIMP_PDB_EXECUTION_ERROR;
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
mblur_linear (void)
{
GimpPixelRgn dest_rgn;
GimpPixelFetcher *pft;
gpointer pr;
GimpRGB background;
guchar *dest;
guchar *d;
guchar pixel[4];
gint32 sum[4];
gint progress, max_progress;
gint c;
gint x, y, i, xx, yy, n;
gint dx, dy, px, py, swapdir, err, e, s1, s2;
gimp_pixel_rgn_init (&dest_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_palette_get_background (&background);
gimp_pixel_fetcher_set_bg_color (pft, &background);
progress = 0;
max_progress = sel_width * sel_height;
n = mbvals.length;
px = (gdouble) n * cos (mbvals.angle / 180.0 * G_PI);
py = (gdouble) n * sin (mbvals.angle / 180.0 * G_PI);
/*
* Initialization for Bresenham algorithm:
* dx = abs(x2-x1), s1 = sign(x2-x1)
* dy = abs(y2-y1), s2 = sign(y2-y1)
*/
if ((dx = px) != 0)
{
if (dx < 0)
{
dx = -dx;
s1 = -1;
}
else
s1 = 1;
}
else
s1 = 0;
if ((dy = py) != 0)
{
if (dy < 0)
{
dy = -dy;
s2 = -1;
}
else
s2 = 1;
}
else
s2 = 0;
if (dy > dx)
{
swapdir = dx;
dx = dy;
dy = swapdir;
swapdir = 1;
}
else
swapdir = 0;
dy *= 2;
err = dy - dx; /* Initial error term */
dx *= 2;
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
dest = dest_rgn.data;
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
d = dest;
for (x = dest_rgn.x; x < dest_rgn.x + dest_rgn.w; x++)
{
xx = x; yy = y; e = err;
for (c = 0; c < img_bpp; c++)
sum[c]= 0;
for (i = 0; i < n; )
{
gimp_pixel_fetcher_get_pixel (pft, xx, yy, pixel);
if (has_alpha)
{
gint32 alpha = pixel[img_bpp-1];
sum[img_bpp-1] += alpha;
for (c = 0; c < img_bpp-1; c++)
sum[c] += pixel[c] * alpha;
}
else
{
for (c = 0; c < img_bpp; c++)
sum[c] += pixel[c];
}
i++;
while (e >= 0 && dx)
{
if (swapdir)
xx += s1;
else
yy += s2;
e -= dx;
}
if (swapdir)
yy += s2;
else
xx += s1;
e += dy;
if ((xx < sel_x1) || (xx >= sel_x2) ||
(yy < sel_y1) || (yy >= sel_y2))
break;
}
if (i == 0)
{
gimp_pixel_fetcher_get_pixel (pft, xx, yy, d);
}
else
{
if (has_alpha)
{
gint32 alpha = sum[img_bpp-1];
if ((d[img_bpp-1] = alpha/i) != 0)
{
for (c = 0; c < img_bpp-1; c++)
d[c] = sum[c] / alpha;
}
}
else
{
for (c = 0; c < img_bpp; c++)
d[c] = sum[c] / i;
}
}
d += dest_rgn.bpp;
}
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / max_progress);
}
gimp_pixel_fetcher_destroy (pft);
}
static void
mblur_radial (void)
{
GimpPixelRgn dest_rgn;
GimpPixelFetcher *pft;
gpointer pr;
GimpRGB background;
guchar *dest;
guchar *d;
guchar pixel[4];
gint32 sum[4];
gint progress, max_progress, c;
gint x, y, i, n, xr, yr;
gint count, R, r, w, h, step;
gfloat angle, theta, * ct, * st, offset, xx, yy;
/* initialize */
xx = 0.0;
yy = 0.0;
gimp_pixel_rgn_init (&dest_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_palette_get_background (&background);
gimp_pixel_fetcher_set_bg_color (pft, &background);
progress = 0;
max_progress = sel_width * sel_height;
angle = ((float) mbvals.angle) / 180.0 * G_PI;
w = MAX (img_width-cen_x, cen_x);
h = MAX (img_height-cen_y, cen_y);
R = sqrt (w * w + h * h);
n = 4 * angle * sqrt (R) + 2;
theta = angle / ((float) (n - 1));
ct = g_new (float, n);
st = g_new (float, n);
offset = theta * (n - 1) / 2;
for (i = 0; i < n; ++i)
{
ct[i] = cos (theta * i - offset);
st[i] = sin (theta * i - offset);
}
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
dest = dest_rgn.data;
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
d = dest;
for (x = dest_rgn.x; x < dest_rgn.x + dest_rgn.w; x++)
{
xr = x-cen_x;
yr = y-cen_y;
r = sqrt (xr * xr + yr * yr);
if (r == 0)
step = 1;
else if ((step = R / r) == 0)
step = 1;
else if (step > n-1)
step = n-1;
for (c = 0; c < img_bpp; c++)
sum[c] = 0;
for (i = 0, count = 0; i < n; i += step)
{
xx = cen_x + xr * ct[i] - yr * st[i];
yy = cen_y + xr * st[i] + yr * ct[i];
if ((yy < sel_y1) || (yy >= sel_y2) ||
(xx < sel_x1) || (xx >= sel_x2))
continue;
++count;
gimp_pixel_fetcher_get_pixel (pft, xx, yy, pixel);
if (has_alpha)
{
gint32 alpha = pixel[img_bpp-1];
sum[img_bpp-1] += alpha;
for (c = 0; c < img_bpp-1; c++)
sum[c] += pixel[c] * alpha;
}
else
{
for (c = 0; c < img_bpp; c++)
sum[c] += pixel[c];
}
}
if (count == 0)
{
gimp_pixel_fetcher_get_pixel (pft, xx, yy, d);
}
else
{
if (has_alpha)
{
gint32 alpha = sum[img_bpp-1];
if ((d[img_bpp-1] = alpha/count) != 0)
{
for (c = 0; c < img_bpp-1; c++)
d[c] = sum[c] / alpha;
}
}
else
{
for (c = 0; c < img_bpp; c++)
d[c] = sum[c] / count;
}
}
d += dest_rgn.bpp;
}
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / max_progress);
}
gimp_pixel_fetcher_destroy (pft);
g_free (ct);
g_free (st);
}
static void
mblur_zoom (void)
{
GimpPixelRgn dest_rgn;
GimpPixelFetcher *pft;
gpointer pr;
GimpRGB background;
guchar *dest, *d;
guchar pixel[4];
gint32 sum[4];
gint progress, max_progress;
int x, y, i, xx, yy, n, c;
float f;
/* initialize */
xx = 0.0;
yy = 0.0;
gimp_pixel_rgn_init (&dest_rgn, drawable,
sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_palette_get_background (&background);
gimp_pixel_fetcher_set_bg_color (pft, &background);
progress = 0;
max_progress = sel_width * sel_height;
n = mbvals.length;
f = 0.02;
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
dest = dest_rgn.data;
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
d = dest;
for (x = dest_rgn.x; x < dest_rgn.x + dest_rgn.w; x++)
{
for (c = 0; c < img_bpp; c++)
sum[c] = 0;
for (i = 0; i < n; ++i)
{
xx = cen_x + (x-cen_x) * (1.0 + f * i);
yy = cen_y + (y-cen_y) * (1.0 + f * i);
if ((yy < sel_y1) || (yy >= sel_y2) ||
(xx < sel_x1) || (xx >= sel_x2))
break;
gimp_pixel_fetcher_get_pixel (pft, xx, yy, pixel);
if (has_alpha)
{
gint32 alpha = pixel[img_bpp-1];
sum[img_bpp-1] += alpha;
for (c = 0; c < img_bpp-1; c++)
sum[c] += pixel[c] * alpha;
}
else
{
for (c = 0; c < img_bpp; c++)
sum[c] += pixel[c];
}
}
if (i == 0)
{
gimp_pixel_fetcher_get_pixel (pft, xx, yy, d);
}
else
{
if (has_alpha)
{
gint32 alpha = sum[img_bpp-1];
if ((d[img_bpp-1] = alpha/i) != 0)
{
for (c = 0; c < img_bpp-1; c++)
d[c] = sum[c] / alpha;
}
}
else
{
for (c = 0; c < img_bpp; c++)
d[c] = sum[c] / i;
}
}
d += dest_rgn.bpp;
}
dest += dest_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / max_progress);
}
gimp_pixel_fetcher_destroy (pft);
}
static void
mblur (void)
{
gimp_progress_init (_("Motion Blurring..."));
switch (mbvals.mblur_type)
{
case MBLUR_LINEAR:
mblur_linear ();
break;
case MBLUR_RADIAL:
mblur_radial ();
break;
case MBLUR_ZOOM:
mblur_zoom ();
break;
default:
break;
}
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
sel_x1, sel_y1, sel_width, sel_height);
}
/****************************************
* UI
****************************************/
static void
mblur_set_sensitivity (void)
{
if (!length || !angle)
return; /* Not initialized yet */
switch (mbvals.mblur_type)
{
case MBLUR_LINEAR:
gimp_scale_entry_set_sensitive(length, TRUE);
gimp_scale_entry_set_sensitive(angle, TRUE);
break;
case MBLUR_RADIAL:
gimp_scale_entry_set_sensitive(length, FALSE);
gimp_scale_entry_set_sensitive(angle, TRUE);
break;
case MBLUR_ZOOM:
gimp_scale_entry_set_sensitive(length, TRUE);
gimp_scale_entry_set_sensitive(angle, FALSE);
break;
default:
break;
}
}
static void
mblur_radio_button_update (GtkWidget *widget, gpointer data)
{
gimp_radio_button_update (widget, data);
mblur_set_sensitivity ();
}
static gboolean
mblur_dialog (void)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *frame;
GtkWidget *table;
gboolean run;
gimp_ui_init ("mblur", FALSE);
dialog = gimp_dialog_new (_("Motion Blur"), "mblur",
NULL, 0,
gimp_standard_help_func, "plug-in-mblur",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 6);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
frame = gimp_int_radio_group_new (TRUE, _("Blur Type"),
G_CALLBACK (mblur_radio_button_update),
&mbvals.mblur_type, mbvals.mblur_type,
_("_Linear"), MBLUR_LINEAR, NULL,
_("_Radial"), MBLUR_RADIAL, NULL,
_("_Zoom"), MBLUR_ZOOM, NULL,
NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
frame = gtk_frame_new (_("Blur Parameters"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (2, 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);
length = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("L_ength:"), 150, 3,
mbvals.length, 0.0, 256.0, 1.0, 8.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (length, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&mbvals.length);
angle = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Angle:"), 150, 3,
mbvals.angle, 0.0, 360.0, 1.0, 15.0, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (angle, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&mbvals.angle);
mblur_set_sensitivity ();
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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