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gimp/plug-ins/common/softglow.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 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.
*/
/* Softglow filter for GIMP for BIPS
* -Spencer Kimball
*
* This filter screens a desaturated, sigmoidally transferred
* and gaussian blurred version of the drawable over itself
* to create a "softglow" photographic effect.
*/
#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-softglow"
#define PLUG_IN_BINARY "softglow"
#define TILE_CACHE_SIZE 48
#define SIGMOIDAL_BASE 2
#define SIGMOIDAL_RANGE 20
#define INT_MULT(a,b,t) ((t) = (a) * (b) + 0x80, ((((t) >> 8) + (t)) >> 8))
typedef struct
{
gdouble glow_radius;
gdouble brightness;
gdouble sharpness;
} SoftglowVals;
/*
* 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 softglow (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean softglow_dialog (GimpDrawable *drawable);
/*
* Gaussian blur 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 jump,
gint width);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static SoftglowVals svals =
{
10.0, /* glow_radius */
0.75, /* brightness */
0.85, /* sharpness */
};
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const 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, "glow-radius", "Glow radius (radius in pixels)" },
{ GIMP_PDB_FLOAT, "brightness", "Glow brightness (0.0 - 1.0)" },
{ GIMP_PDB_FLOAT, "sharpness", "Glow sharpness (0.0 - 1.0)" }
};
gchar *help_string =
"Gives an image a softglow effect by intensifying the highlights in the "
"image. This is done by screening a modified version of the drawable "
"with itself. The modified version is desaturated and then a sigmoidal "
"transfer function is applied to force the distribution of intensities "
"into very small and very large only. This desaturated version is then "
"blurred to give it a fuzzy 'vaseline-on-the-lens' effect. The glow "
"radius parameter controls the sharpness of the glow effect. The "
"brightness parameter controls the degree of intensification applied "
"to image highlights. The sharpness parameter controls how defined or "
"alternatively, diffuse, the glow effect should be.";
gimp_install_procedure (PLUG_IN_PROC,
N_("Simulate glow by making highlights intense and fuzzy"),
help_string,
"Spencer Kimball",
"Bit Specialists, Inc.",
"2001",
N_("_Softglow..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Artistic");
}
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 */
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;
INIT_I18N();
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &svals);
/* First acquire information with a dialog */
if (! softglow_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
svals.glow_radius = param[3].data.d_float;
svals.brightness = param[4].data.d_float;
svals.sharpness = param[5].data.d_float;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &svals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is RGB or GRAY color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init ("Softglow");
softglow (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, &svals, sizeof (SoftglowVals));
}
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);
}
static void
softglow (GimpDrawable *drawable,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
GimpPixelRgn *pr;
gint width, height;
gint bytes;
gboolean has_alpha;
guchar *dest;
guchar *src, *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, max_progress;
gint initial_p[4];
gint initial_m[4];
gint tmp;
gdouble radius;
gdouble std_dev;
gdouble val;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (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);
}
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
val_p = g_new (gdouble, MAX (width, height));
val_m = g_new (gdouble, MAX (width, height));
dest = g_new0 (guchar, width * height);
progress = 0;
max_progress = width * height * 3;
/* Initialize the pixel regions. */
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, width, height, FALSE, FALSE);
for (pr = gimp_pixel_rgns_register (1, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
guchar *src_ptr = src_rgn.data;
guchar *dest_ptr = dest + (src_rgn.y - y1) * width + (src_rgn.x - x1);
for (row = 0; row < src_rgn.h; row++)
{
for (col = 0; col < src_rgn.w; col++)
{
/* desaturate */
if (bytes > 2)
dest_ptr[col] = (guchar) gimp_rgb_to_l_int (src_ptr[col * bytes + 0],
src_ptr[col * bytes + 1],
src_ptr[col * bytes + 2]);
else
dest_ptr[col] = (guchar) src_ptr[col * bytes];
/* compute sigmoidal transfer */
val = dest_ptr[col] / 255.0;
val = 255.0 / (1 + exp (-(SIGMOIDAL_BASE + (svals.sharpness * SIGMOIDAL_RANGE)) * (val - 0.5)));
val = val * svals.brightness;
dest_ptr[col] = (guchar) CLAMP (val, 0, 255);
}
src_ptr += src_rgn.rowstride;
dest_ptr += width;
}
if (!preview)
{
progress += src_rgn.w * src_rgn.h;
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
}
/* Calculate the standard deviations */
radius = fabs (svals.glow_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);
/* First the vertical pass */
for (col = 0; col < width; col++)
{
memset (val_p, 0, height * sizeof (gdouble));
memset (val_m, 0, height * sizeof (gdouble));
src = dest + col;
sp_p = src;
sp_m = src + width * (height - 1);
vp = val_p;
vm = val_m + (height - 1);
/* Set up the first vals */
initial_p[0] = sp_p[0];
initial_m[0] = sp_m[0];
for (row = 0; row < height; row++)
{
gdouble *vpptr, *vmptr;
terms = (row < 4) ? row : 4;
vpptr = vp; vmptr = vm;
for (i = 0; i <= terms; i++)
{
*vpptr += n_p[i] * sp_p[-i * width] - d_p[i] * vp[-i];
*vmptr += n_m[i] * sp_m[i * width] - d_m[i] * vm[i];
}
for (j = i; j <= 4; j++)
{
*vpptr += (n_p[j] - bd_p[j]) * initial_p[0];
*vmptr += (n_m[j] - bd_m[j]) * initial_m[0];
}
sp_p += width;
sp_m -= width;
vp ++;
vm --;
}
transfer_pixels (val_p, val_m, dest + col, width, height);
if (!preview)
{
progress += height;
if ((col % 5) == 0)
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
}
for (row = 0; row < height; row++)
{
memset (val_p, 0, width * sizeof (gdouble));
memset (val_m, 0, width * sizeof (gdouble));
src = dest + row * width;
sp_p = src;
sp_m = src + width - 1;
vp = val_p;
vm = val_m + width - 1;
/* Set up the first vals */
initial_p[0] = sp_p[0];
initial_m[0] = sp_m[0];
for (col = 0; col < width; col++)
{
gdouble *vpptr, *vmptr;
terms = (col < 4) ? col : 4;
vpptr = vp; vmptr = vm;
for (i = 0; i <= terms; i++)
{
*vpptr += n_p[i] * sp_p[-i] - d_p[i] * vp[-i];
*vmptr += n_m[i] * sp_m[i] - d_m[i] * vm[i];
}
for (j = i; j <= 4; j++)
{
*vpptr += (n_p[j] - bd_p[j]) * initial_p[0];
*vmptr += (n_m[j] - bd_m[j]) * initial_m[0];
}
sp_p ++;
sp_m --;
vp ++;
vm --;
}
transfer_pixels (val_p, val_m, dest + row * width, 1, width);
if (!preview)
{
progress += width;
if ((row % 5) == 0)
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
}
/* Initialize the pixel regions. */
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, (preview == NULL), TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
guchar *src_ptr = src_rgn.data;
guchar *dest_ptr = dest_rgn.data;
guchar *blur_ptr = dest + (src_rgn.y - y1) * width + (src_rgn.x - x1);
for (row = 0; row < src_rgn.h; row++)
{
for (col = 0; col < src_rgn.w; col++)
{
/* screen op */
for (b = 0; b < (has_alpha ? (bytes - 1) : bytes); b++)
dest_ptr[col * bytes + b] =
255 - INT_MULT((255 - src_ptr[col * bytes + b]),
(255 - blur_ptr[col]), tmp);
if (has_alpha)
dest_ptr[col * bytes + b] = src_ptr[col * bytes + b];
}
src_ptr += src_rgn.rowstride;
dest_ptr += dest_rgn.rowstride;
blur_ptr += width;
}
if (preview)
{
gimp_drawable_preview_draw_region (GIMP_DRAWABLE_PREVIEW (preview),
&dest_rgn);
}
else
{
progress += src_rgn.w * src_rgn.h;
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
}
if (! preview)
{
/* 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 (dest);
}
/*
* Gaussian blur helper functions
*/
static void
transfer_pixels (gdouble *src1,
gdouble *src2,
guchar *dest,
gint jump,
gint width)
{
gint i;
gdouble sum;
for (i = 0; i < width; i++)
{
sum = src1[i] + src2[i];
sum = CLAMP0255 (sum);
*dest = (guchar) sum;
dest += jump;
}
}
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)
{
gint i;
gdouble constants [8];
gdouble div;
/* The constants used in the implemenation of a casual sequence
* using a 4th order approximation of the gaussian operator
*/
div = sqrt(2 * G_PI) * std_dev;
constants [0] = -1.783 / std_dev;
constants [1] = -1.723 / std_dev;
constants [2] = 0.6318 / std_dev;
constants [3] = 1.997 / std_dev;
constants [4] = 1.6803 / div;
constants [5] = 3.735 / div;
constants [6] = -0.6803 / div;
constants [7] = -0.2598 / div;
n_p [0] = constants[4] + constants[6];
n_p [1] = exp (constants[1]) *
(constants[7] * sin (constants[3]) -
(constants[6] + 2 * constants[4]) * cos (constants[3])) +
exp (constants[0]) *
(constants[5] * sin (constants[2]) -
(2 * constants[6] + constants[4]) * cos (constants[2]));
n_p [2] = 2 * exp (constants[0] + constants[1]) *
((constants[4] + constants[6]) * cos (constants[3]) * cos (constants[2]) -
constants[5] * cos (constants[3]) * sin (constants[2]) -
constants[7] * cos (constants[2]) * sin (constants[3])) +
constants[6] * exp (2 * constants[0]) +
constants[4] * exp (2 * constants[1]);
n_p [3] = exp (constants[1] + 2 * constants[0]) *
(constants[7] * sin (constants[3]) - constants[6] * cos (constants[3])) +
exp (constants[0] + 2 * constants[1]) *
(constants[5] * sin (constants[2]) - constants[4] * cos (constants[2]));
n_p [4] = 0.0;
d_p [0] = 0.0;
d_p [1] = -2 * exp (constants[1]) * cos (constants[3]) -
2 * exp (constants[0]) * cos (constants[2]);
d_p [2] = 4 * cos (constants[3]) * cos (constants[2]) * exp (constants[0] + constants[1]) +
exp (2 * constants[1]) + exp (2 * constants[0]);
d_p [3] = -2 * cos (constants[2]) * exp (constants[0] + 2 * constants[1]) -
2 * cos (constants[3]) * exp (constants[1] + 2 * constants[0]);
d_p [4] = exp (2 * constants[0] + 2 * constants[1]);
#ifndef ORIGINAL_READABLE_CODE
memcpy(d_m, d_p, 5 * sizeof(gdouble));
#else
for (i = 0; i <= 4; i++)
d_m [i] = d_p [i];
#endif
n_m[0] = 0.0;
for (i = 1; i <= 4; i++)
n_m [i] = n_p[i] - d_p[i] * n_p[0];
{
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];
}
#ifndef ORIGINAL_READABLE_CODE
sum_d++;
a = sum_n_p / sum_d;
b = sum_n_m / sum_d;
#else
a = sum_n_p / (1 + sum_d);
b = sum_n_m / (1 + sum_d);
#endif
for (i = 0; i <= 4; i++)
{
bd_p[i] = d_p[i] * a;
bd_m[i] = d_m[i] * b;
}
}
}
/*******************************************************/
/* Dialog */
/*******************************************************/
static gboolean
softglow_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 (_("Softglow"), 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));
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_swapped (preview, "invalidated",
G_CALLBACK (softglow),
drawable);
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);
gtk_widget_show (table);
/* Label, scale, entry for svals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Glow radius:"), 100, 5,
svals.glow_radius, 1.0, 50.0, 1, 5.0, 2,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.glow_radius);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Label, scale, entry for svals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("_Brightness:"), 100, 5,
svals.brightness, 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),
&svals.brightness);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Label, scale, entry for svals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("_Sharpness:"), 100, 5,
svals.sharpness, 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),
&svals.sharpness);
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;
}
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