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gimp/plug-ins/common/neon.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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.
*/
/* Neon filter for the GIMP for BIPS
* -Spencer Kimball
*
* This filter works in a manner similar to the "edge"
* plug-in, but uses the first derivative of the gaussian
* operator to achieve resolution independence. The IIR
* method of calculating the effect is utilized to keep
* the processing time constant between large and small
* standard deviations.
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
typedef struct
{
gdouble radius;
gdouble amount;
} NeonVals;
/*
* Function prototypes.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void neon (GimpDrawable *drawable,
gdouble radius,
gdouble amount,
GtkWidget *preview);
static gboolean neon_dialog (GimpDrawable *drawable);
static void neon_preview_update (GtkWidget *preview);
/*
* Gaussian operator helper functions
*/
static void find_constants (gdouble n_p[],
gdouble n_m[],
gdouble d_p[],
gdouble d_m[],
gdouble bd_p[],
gdouble bd_m[],
gdouble std_dev);
static void transfer_pixels (gdouble *src1,
gdouble *src2,
guchar *dest,
gint bytes,
gint width);
static void combine_to_gradient (guchar *dest,
guchar *src2,
gint bytes,
gint width,
gdouble amount);
/***** Local vars *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static NeonVals evals =
{
5.0, /* radius */
0.0, /* amount */
};
/***** 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, "radius", "Radius of neon effect (in pixels)" },
{ GIMP_PDB_FLOAT, "amount", "Effect enhancement variable (0.0 - 1.0)" },
};
gchar *help_string =
"This filter works in a manner similar to the edge"
"plug-in, but uses the first derivative of the gaussian"
"operator to achieve resolution independence. The IIR"
"method of calculating the effect is utilized to keep"
"the processing time constant between large and small"
"standard deviations.";
gimp_install_procedure ("plug_in_neon",
"Resolution independent edge detection",
help_string,
"Spencer Kimball",
"Bit Specialists, Inc.",
"2002",
N_("_Neon..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register ("plug_in_neon", "<Image>/Filters/Edge-Detect");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpRunMode run_mode;
GimpDrawable *drawable;
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;
INIT_I18N();
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_neon", &evals);
/* First acquire information with a dialog */
if (! neon_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
evals.radius = param[3].data.d_float;
evals.amount = param[4].data.d_float;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_neon", &evals);
break;
default:
break;
}
/* make sure the drawable exist and is not indexed */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Neon..."));
/* set the tile cache size so that the gaussian blur works well */
gimp_tile_cache_ntiles (2 * (MAX (drawable->width, drawable->height) /
gimp_tile_width () + 1));
/* run the neon effect */
neon (drawable, evals.radius, evals.amount, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_neon", &evals, sizeof (NeonVals));
}
else
{
g_message (_("Cannot operate on indexed color images."));
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/**********************************************/
/* Neon main */
/**********************************************/
static void
neon (GimpDrawable *drawable,
gdouble radius,
gdouble amount,
GtkWidget *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
gint width, height;
gint bytes;
gboolean has_alpha;
guchar *dest;
guchar *src, *src2, *sp_p, *sp_m;
gdouble n_p[5], n_m[5];
gdouble d_p[5], d_m[5];
gdouble bd_p[5], bd_m[5];
gdouble *val_p, *val_m, *vp, *vm;
gint x1, y1, x2, y2;
gint i, j;
gint row, col, b;
gint terms;
gint progress = 0, max_progress = 1;
gint initial_p[4];
gint initial_m[4];
gdouble std_dev;
guchar *preview_buffer1 = NULL;
guchar *preview_buffer2 = NULL;
if (preview)
{
gimp_preview_get_position (GIMP_PREVIEW (preview), &x1, &y1);
gimp_preview_get_size (GIMP_PREVIEW (preview), &width, &height);
x2 = x1 + width;
y2 = y1 + height;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = (x2 - x1);
height = (y2 - y1);
}
if (radius < 1.0)
return;
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha(drawable->drawable_id);
val_p = g_new (gdouble, MAX (width, height) * bytes);
val_m = g_new (gdouble, MAX (width, height) * bytes);
src = g_new (guchar, MAX (width, height) * bytes);
src2 = g_new (guchar, MAX (width, height) * bytes);
dest = g_new (guchar, MAX (width, height) * bytes);
gimp_pixel_rgn_init (&src_rgn, drawable,
0, 0, drawable->width, drawable->height, FALSE, FALSE);
if (preview)
{
preview_buffer1 = g_new (guchar, width * height * bytes);
preview_buffer2 = g_new (guchar, width * height * bytes);
}
else
{
gimp_pixel_rgn_init (&dest_rgn, drawable,
0, 0, drawable->width, drawable->height, TRUE, TRUE);
progress = 0;
max_progress = (radius < 1.0 ) ? 0 : width * height * radius * 2;
}
/* First the vertical pass */
radius = fabs (radius) + 1.0;
std_dev = sqrt (-(radius * radius) / (2 * log (1.0 / 255.0)));
/* derive the constants for calculating the gaussian from the std dev */
find_constants (n_p, n_m, d_p, d_m, bd_p, bd_m, std_dev);
for (col = 0; col < width; col++)
{
memset (val_p, 0, height * bytes * sizeof (gdouble));
memset (val_m, 0, height * bytes * sizeof (gdouble));
gimp_pixel_rgn_get_col (&src_rgn, src, col + x1, y1, (y2 - y1));
sp_p = src;
sp_m = src + (height - 1) * bytes;
vp = val_p;
vm = val_m + (height - 1) * bytes;
/* Set up the first vals */
for (i = 0; i < bytes; i++)
{
initial_p[i] = sp_p[i];
initial_m[i] = sp_m[i];
}
for (row = 0; row < height; row++)
{
gdouble *vpptr, *vmptr;
terms = (row < 4) ? row : 4;
for (b = 0; b < bytes; b++)
{
vpptr = vp + b; vmptr = vm + b;
for (i = 0; i <= terms; i++)
{
*vpptr += n_p[i] * sp_p[(-i * bytes) + b] -
d_p[i] * vp[(-i * bytes) + b];
*vmptr += n_m[i] * sp_m[(i * bytes) + b] -
d_m[i] * vm[(i * bytes) + b];
}
for (j = i; j <= 4; j++)
{
*vpptr += (n_p[j] - bd_p[j]) * initial_p[b];
*vmptr += (n_m[j] - bd_m[j]) * initial_m[b];
}
}
sp_p += bytes;
sp_m -= bytes;
vp += bytes;
vm -= bytes;
}
transfer_pixels (val_p, val_m, dest, bytes, height);
if (preview)
{
for (row = 0 ; row < height ; row++)
memcpy (preview_buffer1 + (row * width + col) * bytes,
dest + bytes * row,
bytes);
}
else
{
gimp_pixel_rgn_set_col (&dest_rgn, dest, col + x1, y1, (y2 - y1));
progress += height * radius;
if ((col % 5) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
}
/* Now the horizontal pass */
gimp_pixel_rgn_init (&src_rgn, drawable,
0, 0, drawable->width, drawable->height, FALSE, FALSE);
for (row = 0; row < height; row++)
{
memset (val_p, 0, width * bytes * sizeof (gdouble));
memset (val_m, 0, width * bytes * sizeof (gdouble));
gimp_pixel_rgn_get_row (&src_rgn, src, x1, row + y1, (x2 - x1));
if (preview)
{
memcpy (src2,
preview_buffer1 + row * width * bytes,
width * bytes);
}
else
{
gimp_pixel_rgn_get_row (&dest_rgn, src2, x1, row + y1, (x2 - x1));
}
sp_p = src;
sp_m = src + (width - 1) * bytes;
vp = val_p;
vm = val_m + (width - 1) * bytes;
/* Set up the first vals */
for (i = 0; i < bytes; i++)
{
initial_p[i] = sp_p[i];
initial_m[i] = sp_m[i];
}
for (col = 0; col < width; col++)
{
gdouble *vpptr, *vmptr;
terms = (col < 4) ? col : 4;
for (b = 0; b < bytes; b++)
{
vpptr = vp + b; vmptr = vm + b;
for (i = 0; i <= terms; i++)
{
*vpptr += n_p[i] * sp_p[(-i * bytes) + b] -
d_p[i] * vp[(-i * bytes) + b];
*vmptr += n_m[i] * sp_m[(i * bytes) + b] -
d_m[i] * vm[(i * bytes) + b];
}
for (j = i; j <= 4; j++)
{
*vpptr += (n_p[j] - bd_p[j]) * initial_p[b];
*vmptr += (n_m[j] - bd_m[j]) * initial_m[b];
}
}
sp_p += bytes;
sp_m -= bytes;
vp += bytes;
vm -= bytes;
}
transfer_pixels (val_p, val_m, dest, bytes, width);
combine_to_gradient (dest, src2, bytes, width, amount);
if (preview)
{
memcpy (preview_buffer2 + row * width * bytes,
dest,
width * bytes);
}
else
{
gimp_pixel_rgn_set_row (&dest_rgn, dest, x1, row + y1, (x2 - x1));
progress += width * radius;
if ((row % 5) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
}
if (preview)
{
gimp_drawable_preview_draw_buffer (GIMP_DRAWABLE_PREVIEW (preview),
preview_buffer2, width * bytes);
g_free (preview_buffer1);
g_free (preview_buffer2);
}
else
{
/* now, merge horizontal and vertical into a magnitude */
gimp_pixel_rgn_init (&src_rgn, drawable,
0, 0, drawable->width, drawable->height,
FALSE, TRUE);
/* merge the shadow, update the drawable */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
x1, y1, (x2 - x1), (y2 - y1));
}
/* free up buffers */
g_free (val_p);
g_free (val_m);
g_free (src);
g_free (dest);
}
static void
transfer_pixels (gdouble *src1,
gdouble *src2,
guchar *dest,
gint bytes,
gint width)
{
gint b;
gint bend = bytes * width;
gdouble sum;
for (b = 0; b < bend; b++)
{
sum = *src1++ + *src2++;
if (sum > 255)
sum = 255;
else if (sum < 0)
sum = 0;
*dest++ = (guchar) sum;
}
}
static void
combine_to_gradient (guchar *dest,
guchar *src2,
gint bytes,
gint width,
gdouble amount)
{
gint b;
gint bend = bytes * width;
gdouble h, v;
gdouble sum;
gdouble scale = (1.0 + 9.0 * amount);
for (b = 0; b < bend; b++)
{
/* scale result */
h = *src2++;
v = *dest;
sum = sqrt (h*h + v*v) * scale;
if (sum > 255)
sum = 255;
else if (sum < 0)
sum = 0;
*dest++ = (guchar) sum;
}
}
static void
find_constants (gdouble n_p[],
gdouble n_m[],
gdouble d_p[],
gdouble d_m[],
gdouble bd_p[],
gdouble bd_m[],
gdouble std_dev)
{
gdouble a0, a1, b0, b1, c0, c1, w0, w1;
gdouble w0n, w1n, cos0, cos1, sin0, sin1, b0n, b1n;
gdouble div;
/* coefficients for Gaussian 1st derivative filter */
a0 = 0.6472;
a1 = 4.531;
b0 = 1.527;
b1 = 1.516;
c0 = -0.6494;
c1 = -0.9557;
w0 = 0.6719;
w1 = 2.072;
/* coefficients for Gaussian filter */
/*
a0 = 1.68;
a1 = 3.735;
b0 = 1.783;
b1 = 1.723;
c0 = -0.6803;
c1 = -0.2598;
w0 = 0.6318;
w1 = 1.997;
*/
/* coefficients for filter */
w0n = w0 / std_dev;
w1n = w1 / std_dev;
cos0 = cos (w0n);
cos1 = cos (w1n);
sin0 = sin (w0n);
sin1 = sin (w1n);
b0n = b0 / std_dev;
b1n = b1 / std_dev;
div = sqrt (2 * G_PI) * std_dev;
/*
a0 = a0 / div;
a1 = a1 / div;
c0 = c0 / div;
c1 = c1 / div;
*/
n_p[4] = 0.0;
n_p[3] = exp (-b1n - 2 * b0n) * (c1 * sin1 - cos1 * c0) + exp (-b0n - 2 * b1n) * (a1 * sin0 - cos0 * a0);
n_p[2] = 2 * exp (-b0n - b1n) * ((a0 + c0) * cos1 * cos0 - cos1 * a1 * sin0 - cos0 * c1 * sin1) + c0 * exp (-2 * b0n) + a0 * exp (-2 * b1n);
n_p[1] = exp (-b1n) * (c1 * sin1 - (c0 + 2 * a0) * cos1) + exp (-b0n) * (a1 * sin0 - (2 * c0 + a0) * cos0);
n_p[0] = a0 + c0;
d_p[4] = exp (-2 * b0n - 2 * b1n);
d_p[3] = -2 * cos0 * exp (-b0n - 2 * b1n) - 2 * cos1 * exp (-b1n - 2 * b0n);
d_p[2] = 4 * cos1 * cos0 * exp (-b0n - b1n) + exp (-2 * b1n) + exp (-2 * b0n);
d_p[1] = -2 * exp (-b1n) * cos1 - 2 * exp (-b0n) * cos0;
d_p[0] = 0.0;
/* For first derivative */
n_m[4] = d_p[4] * n_p[0] - n_p[4];
n_m[3] = d_p[3] * n_p[0] - n_p[3];
n_m[2] = d_p[2] * n_p[0] - n_p[2];
n_m[1] = d_p[1] * n_p[0] - n_p[1];
n_m[0] = 0.0;
/* For gaussian operator */
/*
n_m[4] = n_p[4] - d_p[4] * n_p[0];
n_m[3] = n_p[3] - d_p[3] * n_p[0];
n_m[2] = n_p[2] - d_p[2] * n_p[0];
n_m[1] = n_p[1] - d_p[1] * n_p[0];
n_m[0] = 0.0;
*/
d_m[4] = d_p[4];
d_m[3] = d_p[3];
d_m[2] = d_p[2];
d_m[1] = d_p[1];
d_m[0] = d_p[0];
{
gint i;
gdouble sum_n_p, sum_n_m, sum_d;
gdouble a, b;
/*
for (i = 0; i <=4; i++)
{
fprintf (stderr, "n_p[%d] = %f\n", i, n_p[i]);
fprintf (stderr, "n_m[%d] = %f\n", i, n_m[i]);
fprintf (stderr, "d_p[%d] = %f\n", i, d_p[i]);
}
*/
sum_n_p = 0.0;
sum_n_m = 0.0;
sum_d = 0.0;
for (i = 0; i <= 4; i++)
{
sum_n_p += n_p[i];
sum_n_m += n_m[i];
sum_d += d_p[i];
}
a = sum_n_p / (1 + sum_d);
b = sum_n_m / (1 + sum_d);
for (i = 0; i <= 4; i++)
{
bd_p[i] = d_p[i] * a;
bd_m[i] = d_m[i] * b;
}
}
}
/*******************************************************/
/* Dialog */
/*******************************************************/
static gboolean
neon_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkObject *scale_data;
gboolean run;
gimp_ui_init ("neon", FALSE);
dialog = gimp_dialog_new (_("Neon Detection"), "neon",
NULL, 0,
gimp_standard_help_func, "plug-in-neon",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), 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 (preview, "invalidated",
G_CALLBACK (neon_preview_update),
NULL);
table = gtk_table_new (2, 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);
gtk_widget_show (table);
/* Label, scale, entry for evals.radius */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Radius:"), 100, 8,
evals.radius, 0.0, 64.0, 1, 10, 2,
FALSE, 0.0,
8 * MAX (drawable->width, drawable->height),
NULL, NULL);
g_signal_connect (scale_data, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&evals.radius);
g_signal_connect_swapped (scale_data, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Label, scale, entry for evals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Amount:"), 100, 8,
evals.amount, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&evals.amount);
g_signal_connect_swapped (scale_data, "value_changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
neon_preview_update (GtkWidget *preview)
{
neon (GIMP_DRAWABLE_PREVIEW (preview)->drawable,
evals.radius,
evals.amount,
preview);
}
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