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gimp/plug-ins/common/diffraction.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Diffraction plug-in --- Generate diffraction patterns
* Copyright (C) 1997 Federico Mena Quintero and David Bleecker
* federico@nuclecu.unam.mx
* bleecker@math.hawaii.edu
*
* 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.
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-diffraction"
#define PLUG_IN_BINARY "diffraction"
/***** Magic numbers *****/
#define ITERATIONS 100
#define WEIRD_FACTOR 0.04
#define PREVIEW_WIDTH 64
#define PREVIEW_HEIGHT 64
#define PROGRESS_WIDTH 32
#define PROGRESS_HEIGHT 16
#define SCALE_WIDTH 150
/***** Types *****/
typedef struct
{
gdouble lam_r;
gdouble lam_g;
gdouble lam_b;
gdouble contour_r;
gdouble contour_g;
gdouble contour_b;
gdouble edges_r;
gdouble edges_g;
gdouble edges_b;
gdouble brightness;
gdouble scattering;
gdouble polarization;
} diffraction_vals_t;
typedef struct
{
GtkWidget *preview;
GtkWidget *progress;
guchar preview_buffer[PREVIEW_WIDTH * PREVIEW_HEIGHT * 3];
} diffraction_interface_t;
/***** Prototypes *****/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void diffraction (GimpDrawable *drawable);
static void diff_init_luts (void);
static void diff_diffract (gdouble x,
gdouble y,
GimpRGB *rgb);
static double diff_point (gdouble x,
gdouble y,
gdouble edges,
gdouble contours,
gdouble lam);
static double diff_intensity (gdouble x,
gdouble y,
gdouble lam);
static gboolean diffraction_dialog (void);
static void dialog_update_preview (void);
static void dialog_update_callback (GtkWidget *widget,
gpointer data);
/***** Variables *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run /* run */
};
static diffraction_vals_t dvals =
{
0.815, /* lam_r */
1.221, /* lam_g */
1.123, /* lam_b */
0.821, /* contour_r */
0.821, /* contour_g */
0.974, /* contour_b */
0.610, /* edges_r */
0.677, /* edges_g */
0.636, /* edges_b */
0.066, /* brightness */
37.126, /* scattering */
-0.473 /* polarization */
};
static diffraction_interface_t dint =
{
NULL, /* preview */
NULL, /* progress */
{ 0 } /* preview_buffer */
};
static gdouble cos_lut[ITERATIONS + 1];
static gdouble param_lut1[ITERATIONS + 1];
static gdouble param_lut2[ITERATIONS + 1];
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "lam-r", "Light frequency (red)" },
{ GIMP_PDB_FLOAT, "lam-g", "Light frequency (green)" },
{ GIMP_PDB_FLOAT, "lam-b", "Light frequency (blue)" },
{ GIMP_PDB_FLOAT, "contour-r", "Number of contours (red)" },
{ GIMP_PDB_FLOAT, "contour-g", "Number of contours (green)" },
{ GIMP_PDB_FLOAT, "contour-b", "Number of contours (blue)" },
{ GIMP_PDB_FLOAT, "edges-r", "Number of sharp edges (red)" },
{ GIMP_PDB_FLOAT, "edges-g", "Number of sharp edges (green)" },
{ GIMP_PDB_FLOAT, "edges-b", "Number of sharp edges (blue)" },
{ GIMP_PDB_FLOAT, "brightness", "Brightness and shifting/fattening of contours" },
{ GIMP_PDB_FLOAT, "scattering", "Scattering (Speed vs. quality)" },
{ GIMP_PDB_FLOAT, "polarization", "Polarization" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Generate diffraction patterns"),
"Help? What help? Real men do not need help :-)",
"Federico Mena Quintero",
"Federico Mena Quintero & David Bleecker",
"April 1997, 0.5",
N_("_Diffraction Patterns..."),
"RGB*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Render/Pattern");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *active_drawable;
GimpPDBStatusType status;
GimpRunMode run_mode;
/* Initialize */
INIT_I18N ();
diff_init_luts ();
status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
*nreturn_vals = 1;
*return_vals = values;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dvals);
/* Get information from the dialog */
if (!diffraction_dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are present */
if (nparams != 15)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
dvals.lam_r = param[3].data.d_float;
dvals.lam_g = param[4].data.d_float;
dvals.lam_b = param[5].data.d_float;
dvals.contour_r = param[6].data.d_float;
dvals.contour_g = param[7].data.d_float;
dvals.contour_b = param[8].data.d_float;
dvals.edges_r = param[9].data.d_float;
dvals.edges_g = param[10].data.d_float;
dvals.edges_b = param[11].data.d_float;
dvals.brightness = param[12].data.d_float;
dvals.scattering = param[13].data.d_float;
dvals.polarization = param[14].data.d_float;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dvals);
break;
default:
break;
}
/* Get the active drawable */
active_drawable = gimp_drawable_get (param[2].data.d_drawable);
/* Create the diffraction pattern */
if ((status == GIMP_PDB_SUCCESS) &&
gimp_drawable_is_rgb (active_drawable->drawable_id))
{
/* Set the tile cache size */
gimp_tile_cache_ntiles ((active_drawable->width + gimp_tile_width() - 1) /
gimp_tile_width());
/* Run! */
diffraction (active_drawable);
/* If run mode is interactive, flush displays */
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &dvals, sizeof (diffraction_vals_t));
}
else if (status == GIMP_PDB_SUCCESS)
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (active_drawable);
}
typedef struct {
gdouble dhoriz;
gdouble dvert;
gint x1;
gint y1;
} DiffractionParam_t;
static void
diffraction_func (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
DiffractionParam_t *param = (DiffractionParam_t*) data;
gdouble px, py;
GimpRGB rgb;
px = -5.0 + param->dhoriz * (x - param->x1);
py = 5.0 + param->dvert * (y - param->y1);
diff_diffract (px, py, &rgb);
dest[0] = 255.0 * rgb.r;
dest[1] = 255.0 * rgb.g;
dest[2] = 255.0 * rgb.b;
if (bpp == 4)
dest[3] = 255;
}
static void
diffraction (GimpDrawable *drawable)
{
GimpRgnIterator *iter;
DiffractionParam_t param;
gint x1, y1, x2, y2;
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
param.x1 = x1;
param.y1 = y1;
param.dhoriz = 10.0 / (x2 - x1 - 1);
param.dvert = -10.0 / (y2 - y1 - 1);
gimp_progress_init (_("Creating diffraction pattern"));
iter = gimp_rgn_iterator_new (drawable, 0);
gimp_rgn_iterator_dest (iter, diffraction_func, &param);
gimp_rgn_iterator_free (iter);
}
static void
diff_init_luts (void)
{
int i;
double a;
double sina;
a = -G_PI;
for (i = 0; i <= ITERATIONS; i++)
{
sina = sin (a);
cos_lut[i] = cos (a);
param_lut1[i] = 0.75 * sina;
param_lut2[i] = 0.5 * (4.0 * cos_lut[i] * cos_lut[i] + sina * sina);
a += (2.0 * G_PI / ITERATIONS);
}
}
static void
diff_diffract (double x,
double y,
GimpRGB* rgb)
{
rgb->r = diff_point (x, y, dvals.edges_r, dvals.contour_r, dvals.lam_r);
rgb->g = diff_point (x, y, dvals.edges_g, dvals.contour_g, dvals.lam_g);
rgb->b = diff_point (x, y, dvals.edges_b, dvals.contour_b, dvals.lam_b);
}
static double
diff_point (double x,
double y,
double edges,
double contours,
double lam)
{
return fabs (edges * sin (contours * atan (dvals.brightness *
diff_intensity (x, y, lam))));
}
static double
diff_intensity (double x,
double y,
double lam)
{
int i;
double cxy, sxy;
double param;
double polpi2;
double cospolpi2, sinpolpi2;
cxy = 0.0;
sxy = 0.0;
lam *= 4.0;
for (i = 0; i <= ITERATIONS; i++)
{
param = lam *
(cos_lut[i] * x +
param_lut1[i] * y -
param_lut2[i]);
cxy += cos (param);
sxy += sin (param);
}
cxy *= WEIRD_FACTOR;
sxy *= WEIRD_FACTOR;
polpi2 = dvals.polarization * (G_PI / 2.0);
cospolpi2 = cos (polpi2);
sinpolpi2 = sin (polpi2);
return dvals.scattering * ((cospolpi2 + sinpolpi2) * cxy * cxy +
(cospolpi2 - sinpolpi2) * sxy * sxy);
}
static gboolean
diffraction_dialog (void)
{
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *notebook;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *table;
GtkWidget *label;
GtkWidget *button;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Diffraction Patterns"), 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));
hbox = gtk_hbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 12);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox,
FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* Preview */
vbox = gtk_vbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
gtk_widget_show (vbox);
frame = gtk_aspect_frame_new (NULL, 0.5, 0.5, 1.0, TRUE);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
dint.preview = gimp_preview_area_new ();
gtk_widget_set_size_request (dint.preview, PREVIEW_WIDTH, PREVIEW_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), dint.preview);
gtk_widget_show (dint.preview);
dint.progress = gtk_progress_bar_new ();
gtk_widget_set_size_request (dint.progress, PROGRESS_WIDTH, PROGRESS_HEIGHT);
gtk_box_pack_start (GTK_BOX (vbox), dint.progress, FALSE, FALSE, 0);
gtk_widget_show (dint.progress);
button = gtk_button_new_with_mnemonic (_("_Preview!"));
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (dialog_update_callback),
NULL);
/* Notebook */
notebook = gtk_notebook_new ();
gtk_notebook_set_tab_pos (GTK_NOTEBOOK (notebook), GTK_POS_TOP);
gtk_box_pack_start (GTK_BOX (hbox), notebook, TRUE, TRUE, 0);
gtk_widget_show (notebook);
/* Frequencies tab */
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_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Red:"), SCALE_WIDTH, 0,
dvals.lam_r, 0.0, 20.0, 0.2, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.lam_r);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Green:"), SCALE_WIDTH, 0,
dvals.lam_g, 0.0, 20.0, 0.2, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.lam_g);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Blue:"), SCALE_WIDTH, 0,
dvals.lam_b, 0.0, 20.0, 0.2, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.lam_b);
label = gtk_label_new_with_mnemonic (_("Frequencies"));
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), table, label);
/* Contours tab */
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_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Red:"), SCALE_WIDTH, 0,
dvals.contour_r, 0.0, 10.0, 0.1, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.contour_r);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Green:"), SCALE_WIDTH, 0,
dvals.contour_g, 0.0, 10.0, 0.1, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.contour_g);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Blue:"), SCALE_WIDTH, 0,
dvals.contour_b, 0.0, 10.0, 0.1, 1.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.contour_b);
label = gtk_label_new_with_mnemonic (_("Contours"));
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), table, label);
/* Sharp edges tab */
table = gtk_table_new (3, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Red:"), SCALE_WIDTH, 0,
dvals.edges_r, 0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.edges_r);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Green:"), SCALE_WIDTH, 0,
dvals.edges_g, 0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.edges_g);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Blue:"), SCALE_WIDTH, 0,
dvals.edges_b, 0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.edges_b);
label = gtk_label_new_with_mnemonic (_("Sharp Edges"));
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), table, label);
/* Other options tab */
table = gtk_table_new (3, 2, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Brightness:"), SCALE_WIDTH, 7,
dvals.brightness, 0.0, 1.0, 0.01, 0.1, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.brightness);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Sc_attering:"), SCALE_WIDTH, 7,
dvals.scattering, 0.0, 100.0, 1.0, 10.0, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.scattering);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("Po_larization:"), SCALE_WIDTH, 7,
dvals.polarization, -1.0, 1.0, 0.02, 0.2, 3,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&dvals.polarization);
label = gtk_label_new_with_mnemonic (_("Other Options"));
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), table, label);
/* Done */
gtk_widget_show (dialog);
dialog_update_preview ();
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_show (dialog);
return run;
}
static void
dialog_update_preview (void)
{
double left, right, bottom, top;
double px, py;
double dx, dy;
GimpRGB rgb;
int x, y;
guchar *p;
left = -5.0;
right = 5.0;
bottom = -5.0;
top = 5.0;
dx = (right - left) / (PREVIEW_WIDTH - 1);
dy = (bottom - top) / (PREVIEW_HEIGHT - 1);
py = top;
p = dint.preview_buffer;
for (y = 0; y < PREVIEW_HEIGHT; y++)
{
px = left;
for (x = 0; x < PREVIEW_WIDTH; x++)
{
diff_diffract (px, py, &rgb);
*p++ = 255.0 * rgb.r;
*p++ = 255.0 * rgb.g;
*p++ = 255.0 * rgb.b;
px += dx;
}
if ((y % 10) == 0)
{
gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (dint.progress),
(gdouble) y /
(gdouble) (PREVIEW_HEIGHT - 1));
while (gtk_events_pending ())
gtk_main_iteration ();
}
py += dy;
}
gimp_preview_area_draw (GIMP_PREVIEW_AREA (dint.preview),
0, 0, PREVIEW_WIDTH, PREVIEW_HEIGHT,
GIMP_RGB_IMAGE,
dint.preview_buffer,
3 * PREVIEW_WIDTH);
gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (dint.progress), 0.0);
}
static void
dialog_update_callback (GtkWidget *widget,
gpointer data)
{
dialog_update_preview ();
}
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