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- /* Spread --- 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 ENTRY_WIDTH 50
-
- typedef struct
- {
- gdouble spread_amount_x;
- gdouble spread_amount_y;
- } SpreadValues;
-
- typedef struct
- {
- GtkWidget *size;
- gint run;
- } SpreadInterface;
-
-
- /* Declare local functions.
- */
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static void spread (GimpDrawable *drawable);
-
- static gint spread_dialog (gint32 image_ID,
- GimpDrawable *drawable);
- static void spread_ok_callback (GtkWidget *widget,
- gpointer data);
-
- static GimpTile * spread_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 SpreadValues spvals =
- {
- 5, /* horizontal spread amount */
- 5 /* vertical spread amount */
- };
-
- static SpreadInterface pint =
- {
- 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_FLOAT, "spread_amount_x", "Horizontal spread amount (0 <= spread_amount_x <= 200)" },
- { GIMP_PDB_FLOAT, "spread_amount_y", "Vertical spread amount (0 <= spread_amount_y <= 200)" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_spread",
- "Spread the contents of the specified drawable",
- "Spreads the pixels of the specified drawable. "
- "Pixels are randomly moved to another location whose "
- "distance varies from the original by the horizontal "
- "and vertical spread amounts ",
- "Spencer Kimball and Peter Mattis, ported by Brian "
- "Degenhardt and Federico Mena Quintero",
- "Federico Mena Quintero and Brian Degenhardt",
- "1997",
- N_("<Image>/Filters/Noise/Spread..."),
- "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];
- gint32 image_ID;
- GimpDrawable *drawable;
- GimpRunModeType run_mode;
- GimpPDBStatusType status = GIMP_PDB_SUCCESS;
-
- run_mode = param[0].data.d_int32;
-
- /* Get the specified image and drawable */
- image_ID = param[1].data.d_image;
- 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_spread", &spvals);
-
- /* First acquire information with a dialog */
- if (! spread_dialog (image_ID, drawable))
- return;
- break;
-
- case GIMP_RUN_NONINTERACTIVE:
- INIT_I18N();
- /* Make sure all the arguments are there! */
- if (nparams != 5)
- {
- status = GIMP_PDB_CALLING_ERROR;
- }
- else
- {
- spvals.spread_amount_x= param[3].data.d_float;
- spvals.spread_amount_y = param[4].data.d_float;
- }
-
- if ((status == GIMP_PDB_SUCCESS) &&
- (spvals.spread_amount_x < 0 || spvals.spread_amount_x > 200) &&
- (spvals.spread_amount_y < 0 || spvals.spread_amount_y > 200))
- status = GIMP_PDB_CALLING_ERROR;
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- INIT_I18N();
- /* Possibly retrieve data */
- gimp_get_data ("plug_in_spread", &spvals);
- 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 (_("Spreading..."));
-
- /* set the tile cache size */
- gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
-
- /* run the spread effect */
- spread (drawable);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
-
- /* Store data */
- if (run_mode == GIMP_RUN_INTERACTIVE)
- gimp_set_data ("plug_in_spread", &spvals, sizeof (SpreadValues));
- }
- else
- {
- /* gimp_message ("spread: cannot operate on indexed color images"); */
- status = GIMP_PDB_EXECUTION_ERROR;
- }
- }
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
- static void
- spread (GimpDrawable *drawable)
- {
- GimpPixelRgn dest_rgn;
- GimpTile *tile = NULL;
- gint row = -1;
- gint col = -1;
- gpointer pr;
-
- gint width, height;
- gint bytes;
- guchar *destrow;
- guchar *dest;
- guchar pixel[4][4];
- gint x1, y1, x2, y2;
- gint x, y;
- gint progress, max_progress;
-
- gdouble x_amount, y_amount;
- gdouble angle;
-
- gint xdist, ydist;
- gint xi, yi;
-
- gint k;
- gint x_mod_value, x_sub_value;
- gint y_mod_value, y_sub_value;
- gint angle_mod_value, angle_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);
-
- x_amount = spvals.spread_amount_x;
- y_amount = spvals.spread_amount_y;
-
- /* Initialize random stuff */
- srand (time (NULL));
- angle_mod_value = G_PI*2;
- angle_sub_value = angle_mod_value / 2;
- x_mod_value = x_amount + 1;
- x_sub_value = x_mod_value / 2;
- y_mod_value = y_amount + 1;
- y_sub_value = y_mod_value / 2;
-
- /* Spread the image. This is done by going through every pixel
- in the source image and swapping it with some other random
- pixel. The random pixel is located within an ellipse that is
- as high as the spread_amount_y parameter and as wide as the
- spread_amount_x parameter. This is done by randomly selecting
- an angle and then multiplying the sine of the angle to a random
- number whose range is between -spread_amount_x/2 and spread_amount_x/2.
- The y coordinate is found by multiplying the cosine of the angle
- to the random value generated from spread_amount_y. The reason
- that the spread is done this way is to make the end product more
- random looking. To see a result of this, compare spreading a
- square with gimp 0.54 to spreading a square with this filter.
- The corners are less sharp with this algorithm.
- */
-
- /* Spread the image! */
-
- 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))
- {
- destrow = dest_rgn.data;
-
- for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
- {
- dest = destrow;
-
- for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
- {
- /* get random angle, x distance, and y distance */
- xdist = (rand () % x_mod_value) - x_sub_value;
- ydist = (rand () % y_mod_value) - y_sub_value;
- angle = (rand () % angle_mod_value) - angle_sub_value;
-
- xi = x + floor(sin(angle)*xdist);
- yi = y + floor(cos(angle)*ydist);
-
- /* Only displace the pixel if it's within the bounds of the image. */
- if ((xi >= 0) && (xi < width) && (yi >= 0) && (yi < height))
- tile = spread_pixel (drawable, tile,
- x1, y1, x2, y2, xi, yi,
- &row, &col, pixel[0]);
- else
- {
- /* Else just copy it */
- tile = spread_pixel (drawable, tile,
- x1, y1, x2, y2, x, y,
- &row, &col, pixel[0]);
- }
-
- for (k = 0; k < bytes; k++)
- *dest++ = pixel[0][k];
- } /* for */
-
- destrow += 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));
- } /* spread */
-
-
- static gint
- spread_dialog (gint32 image_ID,
- GimpDrawable *drawable)
- {
- GtkWidget *dlg;
- GtkWidget *frame;
- GtkWidget *size;
- GimpUnit unit;
- gdouble xres;
- gdouble yres;
-
- gimp_ui_init ("spread", FALSE);
-
- dlg = gimp_dialog_new (_("Spread"), "spread",
- gimp_standard_help_func, "filters/spread.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
-
- _("OK"), spread_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 = gtk_frame_new (_("Spread Amount"));
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
- gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
-
- /* Get the image resolution and unit */
- gimp_image_get_resolution (image_ID, &xres, &yres);
- unit = gimp_image_get_unit (image_ID);
-
- /* sizeentries */
- size = gimp_coordinates_new (unit, "%a", TRUE, FALSE, 75,
- GIMP_SIZE_ENTRY_UPDATE_SIZE,
-
- spvals.spread_amount_x == spvals.spread_amount_y,
- FALSE,
-
- _("Horizontal:"), spvals.spread_amount_x, xres,
- 0, MAX (drawable->width, drawable->height),
- 0, 0,
-
- _("Vertical:"), spvals.spread_amount_y, yres,
- 0, MAX (drawable->width, drawable->height),
- 0, 0);
- gtk_container_set_border_width (GTK_CONTAINER (size), 4);
- gtk_container_add (GTK_CONTAINER (frame), size);
-
- pint.size = size;
-
- gtk_widget_show (size);
- gtk_widget_show (frame);
-
- gtk_widget_show (dlg);
-
- gtk_main ();
- gdk_flush ();
-
- return pint.run;
- }
-
- static void
- spread_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- spvals.spread_amount_x =
- gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (pint.size), 0);
- spvals.spread_amount_y =
- gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (pint.size), 1);
-
- pint.run = TRUE;
-
- gtk_widget_destroy (GTK_WIDGET (data));
- }
-
- static GimpTile *
- spread_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 >> 6;
- *row = y >> 6;
- 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;
- }
-