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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,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void shift (GimpDrawable *drawable);
-
- static gint shift_dialog (void);
- static void shift_ok_callback (GtkWidget *widget,
- gpointer data);
-
- static GimpTile * shift_pixel (GimpDrawable *drawable,
- GimpTile *tile,
- gint x1,
- gint y1,
- gint x2,
- gint y2,
- gint x,
- gint y,
- gint *row,
- gint *col,
- guchar *pixel);
-
-
- /***** Local vars *****/
-
- GimpPlugInInfo 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 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_INT32, "shift_amount", "shift amount (0 <= shift_amount_x <= 200)" },
- { GIMP_PDB_INT32, "orientation", "vertical, horizontal orientation" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- 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*",
- GIMP_PLUGIN,
- nargs, 0,
- args, NULL);
- }
-
- static void
- run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals)
- {
- static GimpParam values[1];
- GimpDrawable *drawable;
- GimpRunModeType run_mode;
- GimpPDBStatusType status = GIMP_PDB_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 = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- switch (run_mode)
- {
- case GIMP_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 GIMP_RUN_NONINTERACTIVE:
- INIT_I18N();
- /* Make sure all the arguments are there! */
- if (nparams != 5)
- {
- status = GIMP_PDB_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 = GIMP_PDB_CALLING_ERROR;
- }
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- INIT_I18N();
- /* Possibly retrieve data */
- gimp_get_data ("plug_in_shift", &shvals);
- break;
-
- default:
- break;
- }
-
- if (status == GIMP_PDB_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 != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
-
- /* Store data */
- if (run_mode == GIMP_RUN_INTERACTIVE)
- gimp_set_data ("plug_in_shift", &shvals, sizeof (ShiftValues));
- }
- else
- {
- /* gimp_message ("shift: cannot operate on indexed color images"); */
- status = GIMP_PDB_EXECUTION_ERROR;
- }
- }
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
- static void
- shift (GimpDrawable *drawable)
- {
- GimpPixelRgn dest_rgn;
- GimpTile * 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 (k = 0; k < bytes; k++)
- destline++;
- }
-
- 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];
- }
-
- destline += dest_rgn.rowstride;
- }
-
- progress += dest_rgn.w * dest_rgn.h;
- gimp_progress_update ((double) progress / (double) max_progress);
- }
- }
-
- 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));
- }
-
-
- static gint
- shift_dialog (void)
- {
- GtkWidget *dlg;
- GtkWidget *frame;
- GtkWidget *radio_vbox;
- GtkWidget *sep;
- GtkWidget *table;
- GtkObject *amount_data;
-
- gimp_ui_init ("shift", FALSE);
-
- dlg = gimp_dialog_new (_("Shift"), "shift",
- gimp_standard_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 GimpTile *
- shift_pixel (GimpDrawable *drawable,
- GimpTile *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;
- }
-