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gimp/plug-ins/common/displace.c

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/* Displace --- image filter plug-in for The Gimp image manipulation program
* Copyright (C) 1996 Stephen Robert Norris
* Much of the code taken from the pinch plug-in by 1996 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.
*
* You can contact me at srn@flibble.cs.su.oz.au.
* Please send me any patches or enhancements to this code.
* You can contact the original The Gimp authors at gimp@xcf.berkeley.edu
*
* Extensive modifications to the dialog box, parameters, and some
* legibility stuff in displace() by Federico Mena Quintero ---
* federico@nuclecu.unam.mx. If there are any bugs in these
* changes, they are my fault and not Stephen's.
*
* JTL: May 29th 1997
* Added (part of) the patch from Eiichi Takamori -- the part which removes the border artefacts
* (http://ha1.seikyou.ne.jp/home/taka/gimp/displace/displace.html)
* Added ability to use transparency as the identity transformation
* (Full transparency is treated as if it was grey 0.5)
* and the possibility to use RGB/RGBA pictures where the intensity of the pixel is taken into account
*
*/
/* Version 1.12. */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
#include "libgimp/gimpui.h"
/* Some useful macros */
#define ENTRY_WIDTH 75
#define TILE_CACHE_SIZE 48
#define WRAP 0
#define SMEAR 1
#define BLACK 2
typedef struct {
gdouble amount_x;
gdouble amount_y;
gint do_x;
gint do_y;
gint displace_map_x;
gint displace_map_y;
gint displace_type;
} DisplaceVals;
typedef struct {
GtkWidget *amount_x;
GtkWidget *amount_y;
GtkWidget *menu_x;
GtkWidget *menu_y;
gint run;
} DisplaceInterface;
/*
* Function prototypes.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals);
static void displace (GDrawable *drawable);
static gint displace_dialog (GDrawable *drawable);
static GTile * displace_pixel (GDrawable * drawable,
GTile * tile,
gint width,
gint height,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
gint * row,
gint * col,
guchar * pixel);
static guchar bilinear (gdouble x,
gdouble y,
guchar * v);
static gint displace_map_constrain (gint32 image_id,
gint32 drawable_id,
gpointer data);
static void displace_map_x_callback (gint32 id,
gpointer data);
static void displace_map_y_callback (gint32 id,
gpointer data);
static void displace_close_callback (GtkWidget *widget,
gpointer data);
static void displace_ok_callback (GtkWidget *widget,
gpointer data);
static void displace_toggle_update (GtkWidget *widget,
gpointer data);
static void displace_x_toggle_update (GtkWidget *widget,
gpointer data);
static void displace_y_toggle_update (GtkWidget *widget,
gpointer data);
static void displace_entry_callback (GtkWidget *widget,
gpointer data);
static gdouble displace_map_give_value (guchar* ptr,
gint alpha,
gint bytes);
/***** Local vars *****/
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static DisplaceVals dvals =
{
20.0, /* amount_x */
20.0, /* amount_y */
TRUE, /* do_x */
TRUE, /* do_y */
-1, /* displace_map_x */
-1, /* displace_map_y */
WRAP /* displace_type */
};
static DisplaceInterface dint =
{
NULL, /* amount_x */
NULL, /* amount_y */
NULL, /* menu_x */
NULL, /* menu_y */
FALSE /* run */
};
/***** Functions *****/
MAIN ()
static void
query ()
{
static GParamDef args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_FLOAT, "amount_x", "Displace multiplier for X direction" },
{ PARAM_FLOAT, "amount_y", "Displace multiplier for Y direction" },
{ PARAM_INT32, "do_x", "Displace in X direction?" },
{ PARAM_INT32, "do_y", "Displace in Y direction?" },
{ PARAM_DRAWABLE, "displace_map_x", "Displacement map for X direction" },
{ PARAM_DRAWABLE, "displace_map_y", "Displacement map for Y direction" },
{ PARAM_INT32, "displace_type", "Edge behavior: { WRAP (0), SMEAR (1), BLACK (2) }" }
};
static GParamDef *return_vals = NULL;
static gint nargs = sizeof (args) / sizeof (args[0]);
static gint nreturn_vals = 0;
gimp_install_procedure ("plug_in_displace",
"Displace the contents of the specified drawable",
"Displaces the contents of the specified drawable by the amounts specified by 'amount_x' and 'amount_y' multiplied by the intensity of corresponding pixels in the 'displace_map' drawables. Both 'displace_map' drawables must be of type GRAY_IMAGE for this operation to succeed.",
"Stephen Robert Norris & (ported to 1.0 by) Spencer Kimball",
"Stephen Robert Norris",
"1996",
"<Image>/Filters/Map/Displace",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
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:
/* Possibly retrieve data */
gimp_get_data ("plug_in_displace", &dvals);
/* First acquire information with a dialog */
if (! displace_dialog (drawable))
return;
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 10)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
dvals.amount_x = param[3].data.d_float;
dvals.amount_y = param[4].data.d_float;
dvals.do_x = param[5].data.d_int32;
dvals.do_y = param[6].data.d_int32;
dvals.displace_map_x = param[7].data.d_int32;
dvals.displace_map_y = param[8].data.d_int32;
dvals.displace_type = param[9].data.d_int32;
}
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_displace", &dvals);
break;
default:
break;
}
if (status == STATUS_SUCCESS && (dvals.do_x || dvals.do_y))
{
gimp_progress_init ("Displacing...");
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the displace effect */
displace (drawable);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data ("plug_in_displace", &dvals, sizeof (DisplaceVals));
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static int
displace_dialog (GDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *button;
GtkWidget *toggle;
GtkWidget *toggle_hbox;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *entry;
GtkWidget *option_menu;
GtkWidget *menu;
GSList *group = NULL;
gchar **argv;
gchar buffer[32];
gint argc;
gint use_wrap = (dvals.displace_type == WRAP);
gint use_smear = (dvals.displace_type == SMEAR);
gint use_black = (dvals.displace_type == BLACK);
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("displace");
#if 0
printf("displace: pid = %d\n", (int)getpid());
kill(getpid(), SIGSTOP);
#endif
gtk_init (&argc, &argv);
gtk_rc_parse(gimp_gtkrc());
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), "Displace");
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) displace_close_callback,
NULL);
/* Action area */
button = gtk_button_new_with_label ("OK");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) displace_ok_callback,
dlg);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_grab_default (button);
gtk_widget_show (button);
button = gtk_button_new_with_label ("Cancel");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) gtk_widget_destroy,
GTK_OBJECT (dlg));
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_show (button);
/* The main table */
frame = gtk_frame_new ("Displace Options");
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 (3, 3, FALSE);
gtk_container_border_width (GTK_CONTAINER (table), 5);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_table_set_row_spacing (GTK_TABLE (table), 0, 10);
gtk_table_set_row_spacing (GTK_TABLE (table), 1, 10);
gtk_table_set_col_spacing (GTK_TABLE (table), 0, 10);
gtk_table_set_col_spacing (GTK_TABLE (table), 1, 10);
/* on_x, on_y */
toggle = gtk_check_button_new_with_label ("X Displacement: ");
gtk_table_attach (GTK_TABLE (table), toggle, 0, 1, 0, 1, GTK_FILL, GTK_FILL, 0, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) displace_x_toggle_update,
&dvals.do_x);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), dvals.do_x);
gtk_widget_show (toggle);
toggle = gtk_check_button_new_with_label ("Y Displacement: ");
gtk_table_attach (GTK_TABLE (table), toggle, 0, 1, 1, 2, GTK_FILL, GTK_FILL, 0, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) displace_y_toggle_update,
&dvals.do_y);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), dvals.do_y);
gtk_widget_show (toggle);
/* amount_x, amount_y */
dint.amount_x = entry = gtk_entry_new ();
gtk_table_attach (GTK_TABLE (table), entry, 1, 2, 0, 1, GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_set_usize (entry, ENTRY_WIDTH, 0);
sprintf (buffer, "%f", dvals.amount_x);
gtk_entry_set_text (GTK_ENTRY (entry), buffer);
gtk_signal_connect (GTK_OBJECT (entry), "changed",
(GtkSignalFunc) displace_entry_callback,
&dvals.amount_x);
gtk_widget_set_sensitive (dint.amount_x, dvals.do_x);
gtk_widget_show (entry);
dint.amount_y = entry = gtk_entry_new ();
gtk_table_attach (GTK_TABLE (table), entry, 1, 2, 1, 2, GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_set_usize (entry, ENTRY_WIDTH, 0);
sprintf (buffer, "%f", dvals.amount_y);
gtk_entry_set_text (GTK_ENTRY (entry), buffer);
gtk_signal_connect (GTK_OBJECT (entry), "changed",
(GtkSignalFunc) displace_entry_callback,
&dvals.amount_y);
gtk_widget_set_sensitive (dint.amount_y, dvals.do_y);
gtk_widget_show (entry);
/* menu_x, menu_y */
dint.menu_x = option_menu = gtk_option_menu_new ();
gtk_table_attach (GTK_TABLE (table), option_menu, 2, 3, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
menu = gimp_drawable_menu_new (displace_map_constrain, displace_map_x_callback,
drawable, dvals.displace_map_x);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
gtk_widget_set_sensitive (dint.menu_x, dvals.do_x);
gtk_widget_show (option_menu);
dint.menu_y = option_menu = gtk_option_menu_new ();
gtk_table_attach (GTK_TABLE (table), option_menu, 2, 3, 1, 2,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
menu = gimp_drawable_menu_new (displace_map_constrain, displace_map_y_callback,
drawable, dvals.displace_map_y);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
gtk_widget_set_sensitive (dint.menu_y, dvals.do_y);
gtk_widget_show (option_menu);
/* Displacement Type */
toggle_hbox = gtk_hbox_new (FALSE, 10);
gtk_container_border_width (GTK_CONTAINER (toggle_hbox), 5);
gtk_table_attach (GTK_TABLE (table), toggle_hbox, 0, 3, 2, 3, GTK_FILL, GTK_FILL, 0, 0);
label = gtk_label_new ("On Edges: ");
gtk_box_pack_start (GTK_BOX (toggle_hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
toggle = gtk_radio_button_new_with_label (group, "Wrap");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) displace_toggle_update,
&use_wrap);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_wrap);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, "Smear");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) displace_toggle_update,
&use_smear);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_smear);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, "Black");
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (toggle_hbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) displace_toggle_update,
&use_black);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_black);
gtk_widget_show (toggle);
gtk_widget_show (toggle_hbox);
gtk_widget_show (table);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
/* determine displace type */
if (use_wrap)
dvals.displace_type = WRAP;
else if (use_smear)
dvals.displace_type = SMEAR;
else if (use_black)
dvals.displace_type = BLACK;
return dint.run;
}
/* The displacement is done here. */
static void
displace (GDrawable *drawable)
{
GDrawable *map_x;
GDrawable *map_y;
GPixelRgn dest_rgn;
GPixelRgn map_x_rgn;
GPixelRgn map_y_rgn;
GTile * tile = NULL;
gint row = -1;
gint col = -1;
gpointer pr;
gint width;
gint height;
gint bytes;
guchar *destrow, *dest;
guchar *mxrow, *mx;
guchar *myrow, *my;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gint progress, max_progress;
gdouble amnt;
gdouble needx, needy;
gint xi, yi;
guchar values[4];
guchar val;
gint k;
gdouble xm_val, ym_val;
gint xm_alpha = 0;
gint ym_alpha = 0;
gint xm_bytes = 1;
gint ym_bytes = 1;
/* initialize */
mxrow = NULL;
myrow = NULL;
/* 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);
/*
* The algorithm used here is simple - see
* http://the-tech.mit.edu/KPT/Tips/KPT7/KPT7.html for a description.
*/
/* Get the drawables */
if (dvals.displace_map_x != -1 && dvals.do_x)
{
map_x = gimp_drawable_get (dvals.displace_map_x);
gimp_pixel_rgn_init (&map_x_rgn, map_x, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
if (gimp_drawable_has_alpha(map_x->id))
xm_alpha = 1;
xm_bytes = gimp_drawable_bpp(map_x->id);
}
else
map_x = NULL;
if (dvals.displace_map_y != -1 && dvals.do_y)
{
map_y = gimp_drawable_get (dvals.displace_map_y);
gimp_pixel_rgn_init (&map_y_rgn, map_y, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
if (gimp_drawable_has_alpha(map_y->id))
ym_alpha = 1;
ym_bytes = gimp_drawable_bpp(map_y->id);
}
else
map_y = NULL;
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
/* Register the pixel regions */
if (dvals.do_x && dvals.do_y)
pr = gimp_pixel_rgns_register (3, &dest_rgn, &map_x_rgn, &map_y_rgn);
else if (dvals.do_x)
pr = gimp_pixel_rgns_register (2, &dest_rgn, &map_x_rgn);
else if (dvals.do_y)
pr = gimp_pixel_rgns_register (2, &dest_rgn, &map_y_rgn);
else
pr = NULL;
for (pr = pr; pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
destrow = dest_rgn.data;
if (dvals.do_x)
mxrow = map_x_rgn.data;
if (dvals.do_y)
myrow = map_y_rgn.data;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
dest = destrow;
mx = mxrow;
my = myrow;
/*
* We could move the displacement image address calculation out of here,
* but when we can have different sized displacement and destination
* images we'd have to move it back anyway.
*/
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
if (dvals.do_x)
{
xm_val = displace_map_give_value(mx, xm_alpha, xm_bytes);
amnt = dvals.amount_x * (xm_val - 127.5) / 127.5;
needx = x + amnt;
mx += xm_bytes;
}
else
needx = x;
if (dvals.do_y)
{
ym_val = displace_map_give_value(my, ym_alpha, ym_bytes);
amnt = dvals.amount_y * (ym_val - 127.5) / 127.5;
needy = y + amnt;
my += ym_bytes;
}
else
needy = y;
/* Calculations complete; now copy the proper pixel */
if (needx >= 0.0)
xi = (int) needx;
else
xi = -((int) -needx + 1);
if (needy >= 0.0)
yi = (int) needy;
else
yi = -((int) -needy + 1);
tile = displace_pixel (drawable, tile, width, height, x1, y1, x2, y2, xi, yi, &row, &col, pixel[0]);
tile = displace_pixel (drawable, tile, width, height, x1, y1, x2, y2, xi + 1, yi, &row, &col, pixel[1]);
tile = displace_pixel (drawable, tile, width, height, x1, y1, x2, y2, xi, yi + 1, &row, &col, pixel[2]);
tile = displace_pixel (drawable, tile, width, height, x1, y1, x2, y2, xi + 1, yi + 1, &row, &col, pixel[3]);
for (k = 0; k < bytes; k++)
{
values[0] = pixel[0][k];
values[1] = pixel[1][k];
values[2] = pixel[2][k];
values[3] = pixel[3][k];
val = bilinear(needx, needy, values);
*dest++ = val;
} /* for */
}
destrow += dest_rgn.rowstride;
if (dvals.do_x)
mxrow += map_x_rgn.rowstride;
if (dvals.do_y)
myrow += map_y_rgn.rowstride;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
} /* for */
if (tile)
gimp_tile_unref (tile, FALSE);
/* detach from the map drawables */
if (dvals.do_x)
gimp_drawable_detach (map_x);
if (dvals.do_y)
gimp_drawable_detach (map_y);
/* 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));
} /* displace */
static gdouble
displace_map_give_value(guchar *pt, gint alpha, gint bytes)
{
gdouble ret, val_alpha;
if (bytes >= 3)
ret = 0.30 * pt[0] + 0.59 * pt[1] + 0.11 * pt[2];
else
ret = (gdouble) *pt;
if (alpha)
{
val_alpha = pt[bytes - 1];
ret = ((ret - 127.5) * val_alpha / 255.0) + 127.5;
};
return (ret);
}
static GTile *
displace_pixel (GDrawable * drawable,
GTile * tile,
gint width,
gint height,
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;
/* Tile the image. */
if (dvals.displace_type == WRAP)
{
if (x < 0)
x = width - (-x % width);
else
x %= width;
if (y < 0)
y = height - (-y % height);
else
y %= height;
}
/* Smear out the edges of the image by repeating pixels. */
else if (dvals.displace_type == SMEAR)
{
if (x < 0)
x = 0;
else if (x > width - 1)
x = width - 1;
if (y < 0)
y = 0;
else if (y > height - 1)
y = height - 1;
}
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;
}
static guchar
bilinear (gdouble x, gdouble y, guchar *v)
{
gdouble m0, m1;
x = fmod(x, 1.0);
y = fmod(y, 1.0);
if (x < 0)
x += 1.0;
if (y < 0)
y += 1.0;
m0 = (gdouble) v[0] + x * ((gdouble) v[1] - v[0]);
m1 = (gdouble) v[2] + x * ((gdouble) v[3] - v[2]);
return (guchar) (m0 + y * (m1 - m0));
} /* bilinear */
/* Displace interface functions */
static gint
displace_map_constrain (gint32 image_id,
gint32 drawable_id,
gpointer data)
{
GDrawable *drawable;
drawable = (GDrawable *) data;
if (drawable_id == -1)
return TRUE;
if (gimp_drawable_width (drawable_id) == drawable->width &&
gimp_drawable_height (drawable_id) == drawable->height)
return TRUE;
else
return FALSE;
}
static void
displace_map_x_callback (gint32 id,
gpointer data)
{
dvals.displace_map_x = id;
}
static void
displace_map_y_callback (gint32 id,
gpointer data)
{
dvals.displace_map_y = id;
}
static void
displace_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
displace_ok_callback (GtkWidget *widget,
gpointer data)
{
dint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
displace_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
}
static void
displace_x_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
if (dint.amount_x)
gtk_widget_set_sensitive (dint.amount_x, *toggle_val);
if (dint.menu_x)
gtk_widget_set_sensitive (dint.menu_x, *toggle_val);
}
static void
displace_y_toggle_update (GtkWidget *widget,
gpointer data)
{
int *toggle_val;
toggle_val = (int *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
*toggle_val = TRUE;
else
*toggle_val = FALSE;
if (dint.amount_y)
gtk_widget_set_sensitive (dint.amount_y, *toggle_val);
if (dint.menu_y)
gtk_widget_set_sensitive (dint.menu_y, *toggle_val);
}
static void
displace_entry_callback (GtkWidget *widget,
gpointer data)
{
double *text_val;
text_val = (double *) data;
*text_val = atof (gtk_entry_get_text (GTK_ENTRY (widget)));
}
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