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gimp/plug-ins/common/ripple.c

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/* Ripple --- image filter plug-in for The Gimp image manipulation program
* Copyright (C) 1997 Brian Degenhardt
*
* 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 the original The Gimp authors at gimp@xcf.berkeley.edu
*/
#include "config.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 SMEAR 0
#define WRAP 1
#define BLACK 2
#define SAWTOOTH 0
#define SINE 1
typedef struct
{
gint period;
gint amplitude;
gint orientation;
gint edges;
gint waveform;
gint antialias;
gint tile;
} RippleValues;
typedef struct
{
gint run;
} RippleInterface;
/* Declare local functions.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void ripple (GimpDrawable *drawable);
static gint ripple_dialog (void);
static void ripple_ok_callback (GtkWidget *widget,
gpointer data);
static gdouble displace_amount (gint location);
static void average_two_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha);
static void average_four_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha);
/***** Local vars *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static RippleValues rvals =
{
20, /* period */
5, /* amplitude */
HORIZONTAL, /* orientation */
WRAP, /* edges */
SINE, /* waveform */
TRUE, /* antialias */
TRUE /* tile */
};
static RippleInterface rpint =
{
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, "period", "period; number of pixels for one wave to complete" },
{ GIMP_PDB_INT32, "amplitude", "amplitude; maximum displacement of wave" },
{ GIMP_PDB_INT32, "orientation", "orientation; 0 = Horizontal, 1 = Vertical" },
{ GIMP_PDB_INT32, "edges", "edges; 0 = smear, 1 = wrap, 2 = black" },
{ GIMP_PDB_INT32, "waveform", "0 = sawtooth, 1 = sine wave" },
{ GIMP_PDB_INT32, "antialias", "antialias; True or False" },
{ GIMP_PDB_INT32, "tile", "tile; if this is true, the image will retain it's tilability" }
};
gimp_install_procedure ("plug_in_ripple",
"Ripple the contents of the specified drawable",
"Ripples the pixels of the specified drawable. Each row or column will be displaced a certain number of pixels coinciding with the given wave form",
"Brian Degenhardt <bdegenha@ucsd.edu>",
"Brian Degenhardt",
"1997",
N_("<Image>/Filters/Distorts/Ripple..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode 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_ripple", &rvals);
/* First acquire information with a dialog */
if (! ripple_dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 10)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
rvals.period = param[3].data.d_int32;
rvals.amplitude = param[4].data.d_int32;
rvals.orientation = (param[5].data.d_int32) ? VERTICAL : HORIZONTAL;
rvals.edges = (param[6].data.d_int32);
rvals.waveform = param[7].data.d_int32;
rvals.antialias = (param[8].data.d_int32) ? TRUE : FALSE;
rvals.tile = (param[9].data.d_int32) ? TRUE : FALSE;
if (rvals.edges < SMEAR || rvals.edges > BLACK)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data ("plug_in_ripple", &rvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init ( _("Rippling..."));
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the ripple effect */
ripple (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_ripple", &rvals, sizeof (RippleValues));
}
else
{
/* gimp_message ("ripple: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
ripple (GimpDrawable *drawable)
{
GimpPixelRgn dest_rgn;
gpointer pr;
GimpPixelFetcher *pft;
gint width, height;
gint bytes;
gboolean has_alpha;
guchar *destline;
guchar *dest;
guchar *otherdest;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gint progress, max_progress;
gdouble needx, needy;
gint xi, yi;
pft = gimp_pixel_fetcher_new (drawable);
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
width = drawable->width;
height = drawable->height;
bytes = drawable->bpp;
if ( rvals.tile )
{
rvals.edges = WRAP;
rvals.period = (width / (width / rvals.period) *
(rvals.orientation == HORIZONTAL) +
height / (height / rvals.period) *
(rvals.orientation == VERTICAL));
}
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
/* Ripple the image. It's a pretty simple algorithm. If horizontal
is selected, then every row is displaced a number of pixels that
follows the pattern of the waveform selected. The effect is
just reproduced with columns if vertical is selected.
*/
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 (rvals.orientation == VERTICAL)
{
destline = dest_rgn.data;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
dest = destline;
for (y = dest_rgn.y; y < dest_rgn.y + dest_rgn.h; y++)
{
otherdest = dest;
needy = y + displace_amount(x);
yi = floor(needy);
/* Tile the image. */
if (rvals.edges == WRAP)
{
needy = fmod(needy + height, height);
yi = (yi + height) % height;
}
/* Smear out the edges of the image by repeating pixels. */
else if (rvals.edges == SMEAR)
{
yi = CLAMP(yi, 0, height - 1);
}
if (rvals.antialias)
{
if (yi == height - 1)
{
gimp_pixel_fetcher_get_pixel (pft, x, yi, otherdest);
otherdest += bytes;
}
else if (needy < 0 && needy > -1)
{
gimp_pixel_fetcher_get_pixel (pft, x, 0, otherdest);
otherdest += bytes;
}
else if (yi == height - 2 || yi == 0)
{
gimp_pixel_fetcher_get_pixel (pft, x, yi, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, x, yi + 1,
pixel[1]);
average_two_pixels (otherdest, pixel,
needy, bytes, has_alpha);
otherdest += bytes;
}
else
{
gimp_pixel_fetcher_get_pixel (pft, x, yi, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, x, yi + 1,
pixel[1]);
gimp_pixel_fetcher_get_pixel (pft, x, yi - 1,
pixel[2]);
gimp_pixel_fetcher_get_pixel (pft, x, yi + 2,
pixel[3]);
average_four_pixels(otherdest, pixel,
needy, bytes, has_alpha);
otherdest += bytes;
}
} /* antialias */
else
{
gimp_pixel_fetcher_get_pixel (pft, x, yi, otherdest);
}
dest += dest_rgn.rowstride;
} /* for */
destline += bytes;
} /* for */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
else /* HORIZONTAL */
{
destline = dest_rgn.data;
for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
{
dest = destline;
for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
{
needx = x + displace_amount(y);
xi = floor (needx);
/* Tile the image. */
if (rvals.edges == WRAP)
{
needx = fmod((needx + width), width);
xi = (xi + width) % width;
}
/* Smear out the edges of the image by repeating pixels. */
else if (rvals.edges == SMEAR)
{
xi = CLAMP(xi, 0, width - 1);
}
if ( rvals.antialias)
{
if (xi == width - 1)
{
gimp_pixel_fetcher_get_pixel (pft, xi, y, dest);
dest += bytes;
}
else if (floor(needx) == -1)
{
gimp_pixel_fetcher_get_pixel (pft, 0, y, dest);
dest += bytes;
}
else if (xi == width - 2 || xi == 0)
{
gimp_pixel_fetcher_get_pixel (pft, xi, y, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, xi + 1, y,
pixel[1]);
average_two_pixels (dest, pixel,
needx, bytes, has_alpha);
dest += bytes;
}
else
{
gimp_pixel_fetcher_get_pixel (pft, xi, y, pixel[0]);
gimp_pixel_fetcher_get_pixel (pft, xi + 1, y,
pixel[1]);
gimp_pixel_fetcher_get_pixel (pft, xi - 1, y,
pixel[2]);
gimp_pixel_fetcher_get_pixel (pft, xi + 2, y,
pixel[3]);
average_four_pixels(dest, pixel,
needx, bytes, has_alpha);
dest += bytes;
}
} /* antialias */
else
{
gimp_pixel_fetcher_get_pixel (pft, xi, y, dest);
dest += bytes;
}
} /* for */
destline += dest_rgn.rowstride;
} /* for */
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
} /* for */
gimp_pixel_fetcher_destroy (pft);
/* update the region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
}
static gint
ripple_dialog (void)
{
GtkWidget *dlg;
GtkWidget *toggle;
GtkWidget *toggle_vbox;
GtkWidget *main_vbox;
GtkWidget *frame;
GtkWidget *table;
GtkObject *scale_data;
gimp_ui_init ("ripple", TRUE);
dlg = gimp_dialog_new (_("Ripple"), "ripple",
gimp_standard_help_func, "filters/ripple.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
GTK_STOCK_CANCEL, gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
GTK_STOCK_OK, ripple_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
NULL);
g_signal_connect (dlg, "destroy",
G_CALLBACK (gtk_main_quit),
NULL);
/* The main vbox */
main_vbox = gtk_vbox_new (FALSE, 6);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), main_vbox,
FALSE, FALSE, 0);
/* The table to hold the four frames of options */
table = gtk_table_new (2, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
/* Options section */
frame = gtk_frame_new ( _("Options"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
toggle_vbox = gtk_vbox_new (FALSE, 1);
gtk_container_set_border_width (GTK_CONTAINER (toggle_vbox), 2);
gtk_container_add (GTK_CONTAINER (frame), toggle_vbox);
toggle = gtk_check_button_new_with_mnemonic (_("_Antialiasing"));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), rvals.antialias);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&rvals.antialias);
toggle = gtk_check_button_new_with_mnemonic ( _("_Retain Tilability"));
gtk_box_pack_start (GTK_BOX (toggle_vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), (rvals.tile));
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&rvals.tile);
gtk_widget_show (toggle_vbox);
gtk_widget_show (frame);
/* Orientation toggle box */
frame = gimp_radio_group_new2 (TRUE, _("Orientation"),
G_CALLBACK (gimp_radio_button_update),
&rvals.orientation,
GINT_TO_POINTER (rvals.orientation),
_("_Horizontal"),
GINT_TO_POINTER (HORIZONTAL), NULL,
_("_Vertical"),
GINT_TO_POINTER (VERTICAL), NULL,
NULL);
gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (frame);
/* Edges toggle box */
frame = gimp_radio_group_new2 (TRUE, _("Edges"),
G_CALLBACK (gimp_radio_button_update),
&rvals.edges, (gpointer) rvals.edges,
_("_Wrap"), (gpointer) WRAP, NULL,
_("_Smear"), (gpointer) SMEAR, NULL,
_("_Black"), (gpointer) BLACK, NULL,
NULL);
gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 1, 2,
GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
/* Wave toggle box */
frame = gimp_radio_group_new2 (TRUE, _("Wave Type"),
G_CALLBACK (gimp_radio_button_update),
&rvals.waveform, (gpointer) rvals.waveform,
_("Saw_tooth"), (gpointer) SAWTOOTH, NULL,
_("S_ine"), (gpointer) SINE, NULL,
NULL);
gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 1, 2,
GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);
gtk_widget_show (frame);
gtk_widget_show (table);
/* Parameter Settings */
frame = gtk_frame_new ( _("Parameter Settings"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
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);
/* Period */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Period:"), SCALE_WIDTH, 0,
rvals.period, 0, 200, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&rvals.period);
/* Amplitude */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("A_mplitude:"), SCALE_WIDTH, 0,
rvals.amplitude, 0, 200, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value_changed",
G_CALLBACK (gimp_int_adjustment_update),
&rvals.amplitude);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (main_vbox);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return rpint.run;
}
/* Ripple interface functions */
static void
ripple_ok_callback (GtkWidget *widget,
gpointer data)
{
rpint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
average_two_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha)
{
gint b;
x = fmod (x, 1.0);
if (has_alpha)
{
double xa0 = pixels[0][bpp-1] * (1.0 - x);
double xa1 = pixels[1][bpp-1] * x;
double alpha;
alpha = xa0 + xa1;
dest[bpp-1] = alpha;
if (dest[bpp-1])
for (b = 0; b < bpp-1; b++)
dest[b] = (xa0 * pixels[0][b] + xa1 * pixels[1][b])/alpha;
}
else
{
for (b = 0; b < bpp; b++)
dest[b] = (1.0 - x) * pixels[0][b] + x * pixels[1][b];
}
}
static void
average_four_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha)
{
gint b;
x = fmod (x, 1.0);
if (has_alpha)
{
double xa0 = pixels[0][bpp-1] * (1.0 - x)/2;
double xa1 = pixels[1][bpp-1] * x/2;
double xa2 = pixels[2][bpp-1] * (1.0 - x)/2;
double xa3 = pixels[3][bpp-1] * x/2;
double alpha;
alpha = xa0 + xa1 + xa2 + xa3;
dest[bpp-1] = alpha;
if (dest[bpp-1])
for (b = 0; b < bpp-1; b++)
dest[b] = (xa0 * pixels[0][b] + xa1 * pixels[1][b]
+ xa2 * pixels[2][b] + xa3 * pixels[3][b])/alpha;
}
else
{
for (b = 0; b < bpp; b++)
dest[b] = (1.0 - x) * (pixels[0][b] + pixels[2][b])
+ x * (pixels[1][b] + pixels[3][b]);
}
}
static gdouble
displace_amount (gint location)
{
switch (rvals.waveform)
{
case SINE:
return (rvals.amplitude *
sin (location * (2 * G_PI) / (gdouble) rvals.period));
case SAWTOOTH:
return floor (rvals.amplitude *
(fabs ((((location % rvals.period) /
(gdouble) rvals.period) * 4) - 2) - 1));
}
return 0.0;
}
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