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gimp/plug-ins/common/edge-neon.c

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/* GIMP - The GNU 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 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/>.
*/
/* Neon filter for 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"
#define PLUG_IN_PROC "plug-in-neon"
#define PLUG_IN_BINARY "edge-neon"
#define PLUG_IN_ROLE "gimp-edge-neon"
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,
GimpPreview *preview);
static gboolean neon_dialog (GimpDrawable *drawable);
static void neon_preview_update (GimpPreview *preview,
GimpDrawable *drawable);
/*
* 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 *****/
const 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 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_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_PROC,
N_("Simulate the glowing boundary of a neon light"),
help_string,
"Spencer Kimball",
"Bit Specialists, Inc.",
"2002",
N_("_Neon (legacy)..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Edge-Detect");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
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);
/* set the tile cache size so that the gaussian blur works well */
gimp_tile_cache_ntiles (2 * (MAX (drawable->ntile_rows, drawable->ntile_cols)));
*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_PROC, &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_PROC, &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"));
/* 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_PROC, &evals, sizeof (NeonVals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
*nreturn_vals = 2;
values[1].type = GIMP_PDB_STRING;
values[1].data.d_string = _("Cannot operate on indexed color images.");
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/**********************************************/
/* Neon main */
/**********************************************/
static void
neon (GimpDrawable *drawable,
gdouble radius,
gdouble amount,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
gint width, height;
gint bytes, bpp;
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 x, y;
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 (preview, &x, &y);
gimp_preview_get_size (preview, &width, &height);
}
else
{
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x, &y, &width, &height))
return;
}
if (radius < 1.0)
return;
bytes = drawable->bpp;
bpp = bytes;
has_alpha = gimp_drawable_has_alpha(drawable->drawable_id);
if (has_alpha)
bpp--;
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 + x, y, height);
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 < bpp; 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];
}
}
if (has_alpha)
{
vp[bpp] = sp_p[bpp];
vm[bpp] = sp_m[bpp];
}
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 + x, y, height);
progress += height * radius;
if ((col % 20) == 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, x, row + y, width);
if (preview)
{
memcpy (src2,
preview_buffer1 + row * width * bytes,
width * bytes);
}
else
{
gimp_pixel_rgn_get_row (&dest_rgn, src2, x, row + y, width);
}
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 < bpp; 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];
}
}
if (has_alpha)
{
vp[bpp] = sp_p[bpp];
vm[bpp] = sp_m[bpp];
}
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, x, row + y, width);
progress += width * radius;
if ((row % 20) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
}
if (preview)
{
gimp_preview_draw_buffer (preview, preview_buffer2, width * bytes);
g_free (preview_buffer1);
g_free (preview_buffer2);
}
else
{
gimp_progress_update (1.0);
/* 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,
x, y, width, height);
}
/* free up buffers */
g_free (val_p);
g_free (val_m);
g_free (src);
g_free (src2);
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;
/* 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;
/*
gdouble div;
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;
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 (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Neon Detection"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_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));
main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new_from_drawable_id (drawable->drawable_id);
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),
drawable);
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 (GimpPreview *preview,
GimpDrawable *drawable)
{
neon (drawable,
evals.radius,
evals.amount,
preview);
}
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