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gimp/plug-ins/common/shift.c

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/* Shift --- image filter plug-in for The Gimp image manipulation program
* Copyright (C) 1997 Brian Degenhardt and 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.
*
* Please direct all comments, questions, bug reports etc to Brian Degenhardt
* bdegenha@ucsd.edu
*
* You can contact Federico Mena Quintero at quartic@polloux.fciencias.unam.mx
* You can contact the original The Gimp authors at gimp@xcf.berkeley.edu
*/
#include "config.h"
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define SCALE_WIDTH 200
#define TILE_CACHE_SIZE 16
#define HORIZONTAL 0
#define VERTICAL 1
#define ENTRY_WIDTH 35
typedef struct
{
gint shift_amount;
gint orientation;
} ShiftValues;
typedef struct
{
gint run;
} ShiftInterface;
/* Declare local functions.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals);
static void shift (GDrawable *drawable);
static gint shift_dialog (void);
static void shift_ok_callback (GtkWidget *widget,
gpointer data);
static GTile * shift_pixel (GDrawable *drawable,
GTile *tile,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
gint *row,
gint *col,
guchar *pixel);
/***** Local vars *****/
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static ShiftValues shvals =
{
5, /* shift amount */
HORIZONTAL /* orientation */
};
static ShiftInterface shint =
{
FALSE /* run */
};
/***** Functions *****/
MAIN ()
static void
query (void)
{
static GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_INT32, "shift_amount", "shift amount (0 <= shift_amount_x <= 200)" },
{ PARAM_INT32, "orientation", "vertical, horizontal orientation" },
};
static gint nargs = sizeof (args) / sizeof (args[0]);
INIT_I18N();
gimp_install_procedure ("plug_in_shift",
"Shift the contents of the specified drawable",
"Shifts the pixels of the specified drawable. Each row will be displaced a random value of pixels.",
"Spencer Kimball and Peter Mattis, ported by Brian Degenhardt and Federico Mena Quintero",
"Brian Degenhardt",
"1997",
N_("<Image>/Filters/Distorts/Shift..."),
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case RUN_INTERACTIVE:
INIT_I18N_UI();
/* Possibly retrieve data */
gimp_get_data ("plug_in_shift", &shvals);
/* First acquire information with a dialog */
if (! shift_dialog ())
return;
break;
case RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = STATUS_CALLING_ERROR;
}
else
{
shvals.shift_amount = param[3].data.d_int32;
shvals.orientation = (param[4].data.d_int32) ? HORIZONTAL : VERTICAL;
if (shvals.shift_amount < 0 || shvals.shift_amount > 200)
status = STATUS_CALLING_ERROR;
}
break;
case RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data ("plug_in_shift", &shvals);
break;
default:
break;
}
if (status == STATUS_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->id) || gimp_drawable_is_gray (drawable->id))
{
gimp_progress_init ( _("Shifting..."));
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the shift effect */
shift (drawable);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data ("plug_in_shift", &shvals, sizeof (ShiftValues));
}
else
{
/* gimp_message ("shift: cannot operate on indexed color images"); */
status = STATUS_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
shift (GDrawable *drawable)
{
GPixelRgn dest_rgn;
GTile * tile = NULL;
gint row = -1;
gint col = -1;
gpointer pr;
gint width, height;
gint bytes;
guchar *destline;
guchar *dest;
guchar *otherdest;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gint progress, max_progress;
gint seed;
gint amount;
gint xdist, ydist;
gint xi, yi;
gint k;
gint mod_value, sub_value;
/* Get selection area */
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
amount = shvals.shift_amount;
/* Initialize random stuff */
mod_value = amount + 1;
sub_value = mod_value / 2;
seed = time(NULL);
/* Shift the image. It's a pretty simple algorithm. If horizontal
is selected, then every row is shifted a random number of pixels
in the range of -shift_amount/2 to shift_amount/2. The effect is
just reproduced with columns if vertical is selected. Vertical
has been added since 0.54 so that the user doesn't have to rotate
the image to do a vertical shift.
*/
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (1, &dest_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
if (shvals.orientation == VERTICAL)
{
destline = dest_rgn.data;
srand(seed+dest_rgn.x);
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
dest = destline;
ydist = (rand() % mod_value) - sub_value;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
otherdest = dest;
yi = (y + ydist + height)%height; /* add width before % because % isn't a true modulo */
tile = shift_pixel (drawable, tile, x1, y1, x2, y2, x, yi, &row, &col, pixel[0]);
for (k = 0; k < bytes; k++)
*otherdest++ = pixel[0][k];
dest += dest_rgn.rowstride;
} /* for */
for (k = 0; k < bytes; k++)
destline++;
} /* for */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
else
{
destline = dest_rgn.data;
srand(seed+dest_rgn.y);
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
dest = destline;
xdist = (rand() % mod_value) - sub_value;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
xi = (x + xdist + width)%width; /* add width before % because % isn't a true modulo */
tile = shift_pixel (drawable, tile, x1, y1, x2, y2, xi, y, &row, &col, pixel[0]);
for (k = 0; k < bytes; k++)
*dest++ = pixel[0][k];
} /* for */
destline += dest_rgn.rowstride;
} /* for */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
} /* for */
if (tile)
gimp_tile_unref (tile, FALSE);
/* update the region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
} /* shift */
static gint
shift_dialog (void)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *radio_vbox;
GtkWidget *sep;
GtkWidget *table;
GtkObject *amount_data;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("shift");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gimp_dialog_new (_("Shift"), "shift",
gimp_plugin_help_func, "filters/shift.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), shift_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
/* parameter settings */
frame =
gimp_radio_group_new2 (TRUE, _("Parameter Settings"),
gimp_radio_button_update,
&shvals.orientation, (gpointer) shvals.orientation,
_("Shift Horizontally"), (gpointer) HORIZONTAL, NULL,
_("Shift Vertically"), (gpointer) VERTICAL, NULL,
NULL);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
radio_vbox = GTK_BIN (frame)->child;
gtk_container_set_border_width (GTK_CONTAINER (radio_vbox), 4);
sep = gtk_hseparator_new ();
gtk_box_pack_start (GTK_BOX (radio_vbox), sep, FALSE, FALSE, 3);
gtk_widget_show (sep);
table = gtk_table_new (1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_box_pack_start (GTK_BOX (radio_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
amount_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Shift Amount:"), SCALE_WIDTH, 0,
shvals.shift_amount, 0, 200, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (amount_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_int_adjustment_update),
&shvals.shift_amount);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return shint.run;
}
static void
shift_ok_callback (GtkWidget *widget,
gpointer data)
{
shint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static GTile *
shift_pixel (GDrawable * drawable,
GTile * tile,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
gint * row,
gint * col,
guchar * pixel)
{
static guchar empty_pixel[4] = {0, 0, 0, 0};
guchar *data;
gint b;
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
if ((x >> 6 != *col) || (y >> 6 != *row))
{
*col = x / 64;
*row = y / 64;
if (tile)
gimp_tile_unref (tile, FALSE);
tile = gimp_drawable_get_tile (drawable, FALSE, *row, *col);
gimp_tile_ref (tile);
}
data = tile->data + tile->bpp * (tile->ewidth * (y % 64) + (x % 64));
}
else
data = empty_pixel;
for (b = 0; b < drawable->bpp; b++)
pixel[b] = data[b];
return tile;
}
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