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gimp/plug-ins/common/gauss_rle.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.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
typedef struct
{
gdouble radius;
gint horizontal;
gint vertical;
} BlurValues;
typedef struct
{
gdouble horizontal;
gdouble vertical;
} Blur2Values;
typedef struct
{
GtkWidget *size;
gint run;
} BlurInterface;
/* Declare local functions.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void gauss_rle (GimpDrawable *drawable,
gdouble horizontal,
gdouble vertical);
/*
* Gaussian blur interface
*/
static gint gauss_rle_dialog (void);
static gint gauss_rle2_dialog (gint32 image_ID,
GimpDrawable *drawable);
/*
* Gaussian blur helper functions
*/
static gint * make_curve (gdouble sigma,
gint * length);
static void run_length_encode (guchar * src,
gint * dest,
gint bytes,
gint width);
static void gauss_ok_callback (GtkWidget *widget,
gpointer data);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static BlurValues bvals =
{
5.0, /* radius */
TRUE, /* horizontal blur */
TRUE /* vertical blur */
};
static Blur2Values b2vals =
{
5.0, /* x radius */
5.0 /* y radius */
};
static BlurInterface bint =
{
FALSE /* run */
};
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 gaussian blur (in pixels > 1.0)" },
{ GIMP_PDB_INT32, "horizontal", "Blur in horizontal direction" },
{ GIMP_PDB_INT32, "vertical", "Blur in vertical direction" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
static GimpParamDef args2[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "horizontal", "Horizontal radius of gaussian blur (in pixels)" },
{ GIMP_PDB_FLOAT, "vertical", "Vertical radius of gaussian blur (in pixels)" }
};
static gint nargs2 = sizeof (args2) / sizeof (args2[0]);
gimp_install_procedure ("plug_in_gauss_rle",
"Applies a gaussian blur to the specified drawable.",
"Applies a gaussian blur to the drawable, with "
"specified radius of affect. The standard deviation "
"of the normal distribution used to modify pixel "
"values is calculated based on the supplied radius. "
"Horizontal and vertical blurring can be "
"independently invoked by specifying only one to "
"run. The RLE gaussian blurring performs most "
"efficiently on computer-generated images or images "
"with large areas of constant intensity. Values for "
"radii less than 1.0 are invalid as they would "
"generate spurious results.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
NULL,
"RGB*, GRAY*",
GIMP_PLUGIN,
nargs, 0,
args, NULL);
gimp_install_procedure ("plug_in_gauss_rle2",
"Applies a gaussian blur to the specified drawable.",
"Applies a gaussian blur to the drawable, with "
"specified radius of affect. The standard deviation "
"of the normal distribution used to modify pixel "
"values is calculated based on the supplied radius. "
"This radius can be specified indepently on for the "
"horizontal and the vertical direction. The RLE "
"gaussian blurring performs most efficiently on "
"computer-generated images or images with large "
"areas of constant intensity. Values for radii "
"less than 1.0 would generate spurious results. "
"Therefore they are interpreted as 0.0, which means "
"that the computation for this orientation is "
"skipped.",
"Spencer Kimball, Peter Mattis & Sven Neumann",
"Spencer Kimball, Peter Mattis & Sven Neumann",
"1995-2000",
N_("<Image>/Filters/Blur/Gaussian Blur (RLE)..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
nargs2, 0,
args2, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
gint32 image_ID;
GimpDrawable *drawable;
GimpRunModeType run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified image and drawable */
image_ID = param[1].data.d_image;
drawable = gimp_drawable_get (param[2].data.d_drawable);
if (strcmp (name, "plug_in_gauss_rle") == 0) /* the old-fashioned way of calling it */
{
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
INIT_I18N_UI();
/* Possibly retrieve data */
gimp_get_data ("plug_in_gauss_rle", &bvals);
/* First acquire information with a dialog */
if (! gauss_rle_dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 6)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
bvals.radius = param[3].data.d_float;
bvals.horizontal = (param[4].data.d_int32) ? TRUE : FALSE;
bvals.vertical = (param[5].data.d_int32) ? TRUE : FALSE;
}
if (status == GIMP_PDB_SUCCESS && (bvals.radius < 1.0))
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data ("plug_in_gauss_rle", &bvals);
break;
default:
break;
}
if (!(bvals.horizontal || bvals.vertical))
{
g_message ( _("gauss_rle: you must specify either horizontal or vertical (or both)"));
status = GIMP_PDB_CALLING_ERROR;
}
}
else if (strcmp (name, "plug_in_gauss_rle2") == 0)
{
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
INIT_I18N_UI();
/* Possibly retrieve data */
gimp_get_data ("plug_in_gauss_rle2", &b2vals);
/* First acquire information with a dialog */
if (! gauss_rle2_dialog (image_ID, drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
b2vals.horizontal = param[3].data.d_float;
b2vals.vertical = param[4].data.d_float;
}
if (status == GIMP_PDB_SUCCESS && (b2vals.horizontal < 1.0 && b2vals.vertical < 1.0))
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data ("plug_in_gauss_rle2", &b2vals);
break;
default:
break;
}
}
else
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->id) ||
gimp_drawable_is_gray (drawable->id))
{
gimp_progress_init ( _("RLE Gaussian Blur"));
/* 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 gaussian blur */
if (strcmp (name, "plug_in_gauss_rle") == 0)
{
gauss_rle (drawable, (bvals.horizontal ? bvals.radius : 0.0),
(bvals.vertical ? bvals.radius : 0.0));
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_gauss_rle", &bvals, sizeof (BlurValues));
}
else
{
gauss_rle (drawable, b2vals.horizontal, b2vals.vertical);
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_gauss_rle2", &b2vals, sizeof (Blur2Values));
}
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
else
{
gimp_message ( "gauss_rle: cannot operate on indexed color images");
status = GIMP_PDB_EXECUTION_ERROR;
}
gimp_drawable_detach (drawable);
}
values[0].data.d_status = status;
}
static gint
gauss_rle_dialog (void)
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *spinbutton;
GtkObject *adj;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *hbox;
gimp_ui_init ("gauss_rle", FALSE);
dlg = gimp_dialog_new (_("RLE Gaussian Blur"), "gauss_rle",
gimp_standard_help_func, "filters/gauss_rle.html",
GTK_WIN_POS_MOUSE,
TRUE, FALSE, TRUE,
_("OK"), gauss_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
/* parameter settings */
frame = gtk_frame_new (_("Parameter Settings"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
gtk_container_add (GTK_CONTAINER (frame), vbox);
toggle = gtk_check_button_new_with_label (_("Blur Horizontally"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&bvals.horizontal);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), bvals.horizontal);
gtk_widget_show (toggle);
toggle = gtk_check_button_new_with_label (_("Blur Vertically"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&bvals.vertical);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), bvals.vertical);
gtk_widget_show (toggle);
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Blur Radius:"));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
spinbutton = gimp_spin_button_new (&adj,
bvals.radius, 1.0, GIMP_MAX_IMAGE_SIZE,
1.0, 5.0, 0, 1, 2);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&bvals.radius);
gtk_widget_show (spinbutton);
gtk_widget_show (hbox);
gtk_widget_show (vbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return bint.run;
}
static gint
gauss_rle2_dialog (gint32 image_ID,
GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *size;
GimpUnit unit;
gdouble xres;
gdouble yres;
gimp_ui_init ("gauss_rle2", FALSE);
dlg = gimp_dialog_new (_("RLE Gaussian Blur"), "gauss_rle",
gimp_standard_help_func, "filters/gauss_rle.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), gauss_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
/* parameter settings */
frame = gtk_frame_new (_("Blur Radius"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
/* Get the image resolution and unit */
gimp_image_get_resolution (image_ID, &xres, &yres);
unit = gimp_image_get_unit (image_ID);
size = gimp_coordinates_new (unit, "%a", TRUE, FALSE, 75,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
b2vals.horizontal == b2vals.vertical,
FALSE,
_("Horizontal:"), b2vals.horizontal, xres,
0, 8 * MAX (drawable->width, drawable->height),
0, 0,
_("Vertical:"), b2vals.vertical, yres,
0, 8 * MAX (drawable->width, drawable->height),
0, 0);
gtk_container_set_border_width (GTK_CONTAINER (size), 4);
gtk_container_add (GTK_CONTAINER (frame), size);
gtk_widget_show (size);
gtk_widget_show (frame);
gtk_widget_show (dlg);
bint.size = size;
gtk_main ();
gdk_flush ();
return bint.run;
}
static void
gauss_ok_callback (GtkWidget *widget,
gpointer data)
{
b2vals.horizontal =
gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (bint.size), 0);
b2vals.vertical =
gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (bint.size), 1);
bint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
/* Convert from separated to premultiplied alpha, on a single scan line. */
static void
multiply_alpha (guchar *buf,
gint width,
gint bytes)
{
gint i, j;
gdouble alpha;
for (i = 0; i < width * bytes; i += bytes)
{
alpha = buf[i + bytes - 1] * (1.0 / 255.0);
for (j = 0; j < bytes - 1; j++)
buf[i + j] *= alpha;
}
}
/* Convert from premultiplied to separated alpha, on a single scan
line. */
static void
separate_alpha (guchar *buf,
gint width,
gint bytes)
{
gint i, j;
guchar alpha;
gdouble recip_alpha;
gint new_val;
for (i = 0; i < width * bytes; i += bytes)
{
alpha = buf[i + bytes - 1];
if (alpha != 0 && alpha != 255)
{
recip_alpha = 255.0 / alpha;
for (j = 0; j < bytes - 1; j++)
{
new_val = buf[i + j] * recip_alpha;
buf[i + j] = MIN (255, new_val);
}
}
}
}
static void
gauss_rle (GimpDrawable *drawable,
gdouble horz,
gdouble vert)
{
GimpPixelRgn src_rgn, dest_rgn;
gint width, height;
gint bytes;
gint has_alpha;
guchar *dest, *dp;
guchar *src, *sp;
gint *buf, *bb;
gint pixels;
gint total = 1;
gint x1, y1, x2, y2;
gint i, row, col, b;
gint start, end;
gint progress, max_progress;
gint *curve;
gint *sum = NULL;
gint val;
gint length;
gint initial_p, initial_m;
gdouble std_dev;
if (horz < 1.0 && vert < 1.0)
return;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
width = (x2 - x1);
height = (y2 - y1);
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha(drawable->id);
buf = g_new (gint, MAX (width, height) * 2);
/* allocate buffers for source and destination pixels */
src = 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);
gimp_pixel_rgn_init (&dest_rgn, drawable, 0, 0, drawable->width, drawable->height, TRUE, TRUE);
progress = 0;
max_progress = (horz < 1.0 ) ? 0 : width * height * horz;
max_progress += (vert < 1.0 ) ? 0 : width * height * vert;
/* First the vertical pass */
if (vert >= 1.0)
{
vert = fabs (vert) + 1.0;
std_dev = sqrt (-(vert * vert) / (2 * log (1.0 / 255.0)));
curve = make_curve (std_dev, &length);
sum = g_new (gint, 2 * length + 1);
sum[0] = 0;
for (i = 1; i <= length*2; i++)
sum[i] = curve[i-length-1] + sum[i-1];
sum += length;
total = sum[length] - sum[-length];
for (col = 0; col < width; col++)
{
gimp_pixel_rgn_get_col (&src_rgn, src, col + x1, y1, (y2 - y1));
if (has_alpha)
multiply_alpha (src, height, bytes);
sp = src;
dp = dest;
for (b = 0; b < bytes; b++)
{
initial_p = sp[b];
initial_m = sp[(height-1) * bytes + b];
/* Determine a run-length encoded version of the row */
run_length_encode (sp + b, buf, bytes, height);
for (row = 0; row < height; row++)
{
start = (row < length) ? -row : -length;
end = (height <= (row + length)) ? (height - row - 1) : length;
val = 0;
i = start;
bb = buf + (row + i) * 2;
if (start != -length)
val += initial_p * (sum[start] - sum[-length]);
while (i < end)
{
pixels = bb[0];
i += pixels;
if (i > end)
i = end;
val += bb[1] * (sum[i] - sum[start]);
bb += (pixels * 2);
start = i;
}
if (end != length)
val += initial_m * (sum[length] - sum[end]);
dp[row * bytes + b] = val / total;
}
}
if (has_alpha && !horz)
separate_alpha (dest, height, bytes);
gimp_pixel_rgn_set_col (&dest_rgn, dest, col + x1, y1, (y2 - y1));
progress += height * vert;
if ((col % 5) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
/* prepare for the horizontal pass */
gimp_pixel_rgn_init (&src_rgn, drawable, 0, 0, drawable->width, drawable->height, FALSE, TRUE);
}
/* Now the horizontal pass */
if (horz >= 1.0)
{
horz = fabs (horz) + 1.0;
if (horz != vert)
{
std_dev = sqrt (-(horz * horz) / (2 * log (1.0 / 255.0)));
curve = make_curve (std_dev, &length);
sum = g_new (gint, 2 * length + 1);
sum[0] = 0;
for (i = 1; i <= length*2; i++)
sum[i] = curve[i-length-1] + sum[i-1];
sum += length;
total = sum[length] - sum[-length];
}
for (row = 0; row < height; row++)
{
gimp_pixel_rgn_get_row (&src_rgn, src, x1, row + y1, (x2 - x1));
if (has_alpha && vert < 1.0)
multiply_alpha (src, height, bytes);
sp = src;
dp = dest;
for (b = 0; b < bytes; b++)
{
initial_p = sp[b];
initial_m = sp[(width-1) * bytes + b];
/* Determine a run-length encoded version of the row */
run_length_encode (sp + b, buf, bytes, width);
for (col = 0; col < width; col++)
{
start = (col < length) ? -col : -length;
end = (width <= (col + length)) ? (width - col - 1) : length;
val = 0;
i = start;
bb = buf + (col + i) * 2;
if (start != -length)
val += initial_p * (sum[start] - sum[-length]);
while (i < end)
{
pixels = bb[0];
i += pixels;
if (i > end)
i = end;
val += bb[1] * (sum[i] - sum[start]);
bb += (pixels * 2);
start = i;
}
if (end != length)
val += initial_m * (sum[length] - sum[end]);
dp[col * bytes + b] = val / total;
}
}
if (has_alpha)
separate_alpha (dest, width, bytes);
gimp_pixel_rgn_set_row (&dest_rgn, dest, x1, row + y1, (x2 - x1));
progress += width * horz;
if ((row % 5) == 0)
gimp_progress_update ((double) progress / (double) max_progress);
}
}
/* merge the shadow, update the drawable */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
/* free buffers */
g_free (buf);
g_free (src);
g_free (dest);
}
/*
* The equations: g(r) = exp (- r^2 / (2 * sigma^2))
* r = sqrt (x^2 + y ^2)
*/
static gint *
make_curve (gdouble sigma,
gint *length)
{
gint *curve;
gdouble sigma2;
gdouble l;
gint temp;
gint i, n;
sigma2 = 2 * sigma * sigma;
l = sqrt (-sigma2 * log (1.0 / 255.0));
n = ceil (l) * 2;
if ((n % 2) == 0)
n += 1;
curve = g_new (gint, n);
*length = n / 2;
curve += *length;
curve[0] = 255;
for (i = 1; i <= *length; i++)
{
temp = (gint) (exp (- (i * i) / sigma2) * 255);
curve[-i] = temp;
curve[i] = temp;
}
return curve;
}
static void
run_length_encode (guchar *src,
gint *dest,
gint bytes,
gint width)
{
gint start;
gint i;
gint j;
guchar last;
last = *src;
src += bytes;
start = 0;
for (i = 1; i < width; i++)
{
if (*src != last)
{
for (j = start; j < i; j++)
{
*dest++ = (i - j);
*dest++ = last;
}
start = i;
last = *src;
}
src += bytes;
}
for (j = start; j < i; j++)
{
*dest++ = (i - j);
*dest++ = last;
}
}
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