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gimp/plug-ins/common/ripple.c

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/* Ripple --- image filter plug-in for GIMP
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* Please direct all comments, questions, bug reports etc to Brian Degenhardt
* bdegenha@ucsd.edu
*
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-ripple"
#define PLUG_IN_BINARY "ripple"
#define SCALE_WIDTH 200
#define TILE_CACHE_SIZE 16
#define SMEAR 0
#define WRAP 1
#define BLANK 2
#define SAWTOOTH 0
#define SINE 1
typedef struct
{
gint period;
gint amplitude;
GimpOrientationType orientation;
gint edges;
gint waveform;
gboolean antialias;
gboolean tile;
gint phase_shift;
} RippleValues;
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void ripple (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean ripple_dialog (GimpDrawable *drawable);
static gdouble displace_amount (gint location);
static void average_two_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static RippleValues rvals =
{
20, /* period */
5, /* amplitude */
GIMP_ORIENTATION_HORIZONTAL, /* orientation */
WRAP, /* edges */
SINE, /* waveform */
TRUE, /* antialias */
FALSE, /* tile */
0 /* phase shift */
};
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ 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 { ORIENTATION-HORIZONTAL (0), ORIENTATION-VERTICAL (1) }" },
{ GIMP_PDB_INT32, "edges", "Edges { SMEAR (0), WRAP (1), BLANK (2) }" },
{ GIMP_PDB_INT32, "waveform", "Waveform { SAWTOOTH (0), SINE (1) }" },
{ GIMP_PDB_INT32, "antialias", "Antialias { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "tile", "Tileable { TRUE, FALSE }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Displace pixels in a ripple pattern"),
"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_("_Ripple..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Distorts");
}
static void
run (const gchar *name,
gint nparams,
const 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;
INIT_I18N ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
*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:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &rvals);
/* First acquire information with a dialog */
if (! ripple_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* 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) ? GIMP_ORIENTATION_VERTICAL : GIMP_ORIENTATION_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.period < 1)
{
gimp_message ("Ripple: period must be at least 1.\n");
status = GIMP_PDB_CALLING_ERROR;
}
if (rvals.edges < SMEAR || rvals.edges > BLANK)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &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"));
/* run the ripple effect */
ripple (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &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);
}
typedef struct
{
GimpPixelFetcher *pft;
gint width;
gint height;
gboolean has_alpha;
} RippleParam_t;
static void
ripple_vertical (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
RippleParam_t *param = data;
GimpPixelFetcher *pft = param->pft;
const gint height = param->height;
guchar pixel[2][4];
gdouble needy;
gint yi, yi_a;
needy = y + displace_amount (x);
yi = floor (needy);
yi_a = yi + 1;
if (rvals.edges == WRAP)
{
/* Tile the image. */
needy = fmod (needy, height);
if (needy < 0.0)
needy += height;
yi = yi % height;
if (yi < 0)
yi += height;
yi_a = yi_a % height;
}
else if (rvals.edges == SMEAR)
{
/* Smear out the edges of the image by repeating pixels. */
needy = CLAMP (needy, 0, height - 1);
yi = CLAMP (yi, 0, height - 1);
yi_a = CLAMP (yi_a, 0, height - 1);
}
if (rvals.antialias)
{
if (yi >= 0 && yi < height)
gimp_pixel_fetcher_get_pixel (pft, x, yi , pixel[0]);
else
memset (pixel[0], 0, 4);
if (yi_a >= 0 && yi_a < height)
gimp_pixel_fetcher_get_pixel (pft, x, yi_a, pixel[1]);
else
memset (pixel[1], 0, 4);
average_two_pixels (dest, pixel, needy - yi, bpp, param->has_alpha);
}
else
{
if (yi >= 0 && yi < height)
gimp_pixel_fetcher_get_pixel (pft, x, yi, dest);
else
memset (dest, 0, bpp);
}
}
static void
ripple_horizontal (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
RippleParam_t *param = data;
GimpPixelFetcher *pft = param->pft;
const gint width = param->width;
guchar pixel[2][4];
gdouble needx;
gint xi, xi_a;
needx = x + displace_amount (y);
xi = floor (needx);
xi_a = xi + 1;
if (rvals.edges == WRAP)
{
/* Tile the image. */
needx = fmod (needx, width);
while (needx < 0.0)
needx += width;
xi = (xi % width);
while (xi < 0)
xi += width;
xi_a = (xi+1) % width;
}
else if (rvals.edges == SMEAR)
{
/* Smear out the edges of the image by repeating pixels. */
needx = CLAMP (needx, 0, width - 1);
xi = CLAMP (xi, 0, width - 1);
xi_a = CLAMP (xi_a, 0, width - 1);
}
if (rvals.antialias)
{
if (xi >= 0 && xi < width)
gimp_pixel_fetcher_get_pixel (pft, xi, y, pixel[0]);
else
memset (pixel[0], 0, 4);
if (xi_a >= 0 && xi_a < width)
gimp_pixel_fetcher_get_pixel (pft, xi_a, y, pixel[1]);
else
memset (pixel[1], 0, 4);
average_two_pixels (dest, pixel, needx - xi, bpp, param->has_alpha);
}
else
{
if (xi >= 0 && xi < width)
gimp_pixel_fetcher_get_pixel (pft, xi, y, dest);
else
memset (dest, 0, bpp);
}
}
static void
ripple (GimpDrawable *drawable,
GimpPreview *preview)
{
RippleParam_t param;
gint edges;
gint period;
param.pft = gimp_pixel_fetcher_new (drawable, FALSE);
param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
param.width = drawable->width;
param.height = drawable->height;
edges = rvals.edges;
period = rvals.period;
if (rvals.tile)
{
rvals.edges = WRAP;
rvals.period = (param.width / (param.width / rvals.period) *
(rvals.orientation == GIMP_ORIENTATION_HORIZONTAL) +
param.height / (param.height / rvals.period) *
(rvals.orientation == GIMP_ORIENTATION_VERTICAL));
}
if (preview)
{
guchar *buffer, *d;
gint bpp = gimp_drawable_bpp (drawable->drawable_id);
gint width, height;
gint x, y;
gint x1, y1;
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
d = buffer = g_new (guchar, width * height * bpp);
for (y = 0; y < height ; y++)
for (x = 0; x < width ; x++)
{
if (rvals.orientation == GIMP_ORIENTATION_VERTICAL)
ripple_vertical (x1 + x, y1 + y, d, bpp, &param);
else
ripple_horizontal (x1 + x, y1 + y, d, bpp, &param);
d += bpp;
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
}
else
{
GimpRgnIterator *iter;
iter = gimp_rgn_iterator_new (drawable, 0);
gimp_rgn_iterator_dest (iter,
rvals.orientation == GIMP_ORIENTATION_VERTICAL ?
ripple_vertical :
ripple_horizontal,
&param);
gimp_rgn_iterator_free (iter);
}
rvals.edges = edges;
rvals.period = period;
gimp_pixel_fetcher_destroy (param.pft);
}
static gboolean
ripple_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *toggle;
GtkWidget *toggle_vbox;
GtkWidget *frame;
GtkWidget *table;
GtkObject *scale_data;
GtkWidget *horizontal;
GtkWidget *vertical;
GtkWidget *wrap;
GtkWidget *smear;
GtkWidget *blank;
GtkWidget *sawtooth;
GtkWidget *sine;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Ripple"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
/* The main vbox */
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (ripple),
drawable);
/* The table to hold the four frames of options */
table = gtk_table_new (2, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 12);
gtk_table_set_row_spacings (GTK_TABLE (table), 12);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
/* Options section */
frame = gimp_frame_new ( _("Options"));
gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
gtk_widget_show (frame);
toggle_vbox = gtk_vbox_new (FALSE, 6);
gtk_container_add (GTK_CONTAINER (frame), toggle_vbox);
gtk_widget_show (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);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
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);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Orientation toggle box */
frame = gimp_int_radio_group_new (TRUE, _("Orientation"),
G_CALLBACK (gimp_radio_button_update),
&rvals.orientation, rvals.orientation,
_("_Horizontal"), GIMP_ORIENTATION_HORIZONTAL,
&horizontal,
_("_Vertical"), GIMP_ORIENTATION_VERTICAL,
&vertical,
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);
g_signal_connect_swapped (horizontal, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (vertical, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Edges toggle box */
frame = gimp_int_radio_group_new (TRUE, _("Edges"),
G_CALLBACK (gimp_radio_button_update),
&rvals.edges, rvals.edges,
_("_Wrap"), WRAP, &wrap,
_("_Smear"), SMEAR, &smear,
_("_Blank"), BLANK, &blank,
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);
g_object_set_data (G_OBJECT (toggle), "inverse_sensitive", frame);
gimp_toggle_button_sensitive_update (GTK_TOGGLE_BUTTON (toggle));
g_signal_connect_swapped (wrap, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (smear, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (blank, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Wave toggle box */
frame = gimp_int_radio_group_new (TRUE, _("Wave Type"),
G_CALLBACK (gimp_radio_button_update),
&rvals.waveform, rvals.waveform,
_("Saw_tooth"), SAWTOOTH, &sawtooth,
_("S_ine"), SINE, &sine,
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);
g_signal_connect_swapped (sawtooth, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (sine, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (table);
table = gtk_table_new (3, 3, 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);
/* Period */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Period:"), SCALE_WIDTH, 0,
rvals.period, 1, 200, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&rvals.period);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* 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);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Phase Shift */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("Phase _shift:"), SCALE_WIDTH, 0,
rvals.phase_shift, 0, 360, 1, 15, 0,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&rvals.phase_shift);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
average_two_pixels (guchar *dest,
guchar pixels[4][4],
gdouble x,
gint bpp,
gboolean has_alpha)
{
gint b;
/* x = x - floor(x); */
if (has_alpha)
{
gdouble xa0 = pixels[0][bpp-1] * (1.0 - x);
gdouble xa1 = pixels[1][bpp-1] * x;
gdouble alpha;
alpha = xa0 + xa1;
if (alpha)
for (b = 0; b < bpp-1; b++)
dest[b] = (xa0 * pixels[0][b] + xa1 * pixels[1][b]) / alpha;
dest[bpp-1] = alpha;
}
else
{
for (b = 0; b < bpp; b++)
dest[b] = (1.0 - x) * pixels[0][b] + x * pixels[1][b];
}
}
static gdouble
displace_amount (gint location)
{
const gdouble phi = rvals.phase_shift / 360.0;
gdouble lambda;
switch (rvals.waveform)
{
case SINE:
return (rvals.amplitude *
sin (2 * G_PI * (location / (gdouble) rvals.period - phi)));
case SAWTOOTH:
lambda = location % rvals.period - phi * rvals.period;
if (lambda < 0)
lambda += rvals.period;
return (rvals.amplitude * (fabs (((lambda / rvals.period) * 4) - 2) - 1));
}
return 0.0;
}
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