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gimp/plug-ins/common/edge-dog.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/>.
*/
/*
* Gimp plug-in dog.c: (C) 2004 William Skaggs
*
* Edge detection using the "Difference of Gaussians" method.
* Finds edges by doing two Gaussian blurs with different radius, and
* subtracting the results. Blurring is done using code taken from
* gauss_rle.c (as of Gimp 2.1, incorporated into gauss.c).
*/
#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-dog"
#define PLUG_IN_BINARY "edge-dog"
#define PLUG_IN_ROLE "gimp-edge-dog"
typedef struct
{
gdouble inner;
gdouble outer;
gboolean normalize;
gboolean invert;
} DoGValues;
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint dog_dialog (gint32 image_ID,
GimpDrawable *drawable);
static void gauss_rle (GimpDrawable *drawable,
gdouble radius,
gint pass,
gboolean show_progress);
static void compute_difference (GimpDrawable *drawable,
GimpDrawable *drawable1,
GimpDrawable *drawable2,
guchar *maxval);
static void normalize_invert (GimpDrawable *drawable,
gboolean normalize,
guint maxval,
gboolean invert);
static void dog (gint32 image_ID,
GimpDrawable *drawable,
gdouble inner,
gdouble outer,
gboolean show_progress);
static void preview_update_preview (GimpPreview *preview,
GimpDrawable *drawable);
static void change_radius_callback (GtkWidget *widget,
gpointer data);
/*
* 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);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static DoGValues dogvals =
{
3.0, /* inner radius */
1.0, /* outer radius */
TRUE, /* normalize */
TRUE /* invert */
};
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" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_FLOAT, "inner", "Radius of inner gaussian blur (in pixels, > 0.0)" },
{ GIMP_PDB_FLOAT, "outer", "Radius of outer gaussian blur (in pixels, > 0.0)" },
{ GIMP_PDB_INT32, "normalize", "Normalize { TRUE, FALSE }" },
{ GIMP_PDB_INT32, "invert", "Invert { TRUE, FALSE }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Edge detection with control of edge thickness"),
"Applies two Gaussian blurs to the drawable, and "
"subtracts the results. This is robust and widely "
"used method for detecting edges.",
"Spencer Kimball, Peter Mattis, Sven Neumann, William Skaggs",
"Spencer Kimball, Peter Mattis, Sven Neumann, William Skaggs",
"1995-2004",
N_("_Difference of Gaussians (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];
gint32 image_ID;
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GError *error = NULL;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
if (! gimp_item_is_layer (param[2].data.d_drawable))
{
g_set_error (&error, 0, 0, "%s",
_("Can operate on layers only "
"(but was called on channel or mask)."));
status = GIMP_PDB_EXECUTION_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
/* Get the specified image and drawable */
image_ID = param[1].data.d_image;
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->width, drawable->height) /
gimp_tile_width () + 1));
if (strcmp (name, PLUG_IN_PROC) == 0)
{
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dogvals);
/* First acquire information with a dialog */
if (! dog_dialog (image_ID, drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 7)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
dogvals.inner = param[3].data.d_float;
dogvals.outer = param[4].data.d_float;
dogvals.normalize = param[5].data.d_int32;
dogvals.invert = param[6].data.d_int32;
if (dogvals.inner <= 0.0 || dogvals.outer <= 0.0)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &dogvals);
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->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("DoG Edge Detect"));
/* run the Difference of Gaussians */
gimp_image_undo_group_start (image_ID);
dog (image_ID, drawable, dogvals.inner, dogvals.outer, TRUE);
gimp_image_undo_group_end (image_ID);
gimp_progress_update (1.0);
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &dogvals, sizeof (DoGValues));
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
}
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.");
}
gimp_drawable_detach (drawable);
}
if (status != GIMP_PDB_SUCCESS && error)
{
*nreturn_vals = 2;
values[1].type = GIMP_PDB_STRING;
values[1].data.d_string = error->message;
}
values[0].data.d_status = status;
}
static gint
dog_dialog (gint32 image_ID,
GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *frame;
GtkWidget *button;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *coord;
GimpUnit unit;
gdouble xres;
gdouble yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("DoG Edge Detect"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_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, FALSE, FALSE, 0);
gtk_widget_show (preview);
g_signal_connect (preview, "invalidated",
G_CALLBACK (preview_update_preview),
drawable);
frame = gimp_frame_new (_("Smoothing Parameters"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
/* Get the image resolution and unit */
gimp_image_get_resolution (image_ID, &xres, &yres);
unit = gimp_image_get_unit (image_ID);
coord = gimp_coordinates_new (unit, "%a", TRUE, FALSE, -1,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
FALSE,
TRUE,
_("_Radius 1:"), dogvals.inner, xres,
0, 8 * MAX (drawable->width, drawable->height),
0, 0,
_("R_adius 2:"), dogvals.outer, yres,
0, 8 * MAX (drawable->width, drawable->height),
0, 0);
gtk_container_add (GTK_CONTAINER (frame), coord);
gtk_widget_show (coord);
gimp_size_entry_set_pixel_digits (GIMP_SIZE_ENTRY (coord), 1);
g_signal_connect (coord, "value-changed",
G_CALLBACK (change_radius_callback),
preview);
button = gtk_check_button_new_with_mnemonic (_("_Normalize"));
gtk_box_pack_start (GTK_BOX (main_vbox), button, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), dogvals.normalize);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&dogvals.normalize);
g_signal_connect_swapped (button, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (button);
button = gtk_check_button_new_with_mnemonic (_("_Invert"));
gtk_box_pack_start (GTK_BOX (main_vbox), button, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), dogvals.invert);
g_signal_connect (button, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&dogvals.invert);
g_signal_connect_swapped (button, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (button);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
if (run)
{
dogvals.inner = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (coord), 0);
dogvals.outer = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (coord), 1);
}
gtk_widget_destroy (dialog);
return run;
}
/* 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
dog (gint32 image_ID,
GimpDrawable *drawable,
gdouble inner,
gdouble outer,
gboolean show_progress)
{
GimpDrawable *drawable1;
GimpDrawable *drawable2;
gint32 drawable_id = drawable->drawable_id;
gint32 layer1;
gint32 layer2;
gint width, height;
gint x1, y1;
guchar maxval = 255;
if (! gimp_drawable_mask_intersect (drawable_id, &x1, &y1, &width, &height))
return;
gimp_drawable_flush (drawable);
layer1 = gimp_layer_copy (drawable_id);
gimp_item_set_visible (layer1, FALSE);
gimp_item_set_name (layer1, "dog_scratch_layer1");
gimp_image_insert_layer (image_ID, layer1,
gimp_item_get_parent (drawable_id), 0);
layer2 = gimp_layer_copy (drawable_id);
gimp_item_set_visible (layer2, FALSE);
gimp_item_set_name (layer2, "dog_scratch_layer2");
gimp_image_insert_layer (image_ID, layer2,
gimp_item_get_parent (drawable_id), 0);
drawable1 = gimp_drawable_get (layer1);
drawable2 = gimp_drawable_get (layer2);
gauss_rle (drawable1, inner, 0, show_progress);
gauss_rle (drawable2, outer, 1, show_progress);
compute_difference (drawable, drawable1, drawable2, &maxval);
gimp_drawable_detach (drawable1);
gimp_drawable_detach (drawable2);
gimp_image_remove_layer (image_ID, layer1);
gimp_image_remove_layer (image_ID, layer2);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable_id, TRUE);
gimp_drawable_update (drawable_id, x1, y1, width, height);
if (dogvals.normalize || dogvals.invert)
/* gimp_invert doesn't work properly with previews due to shadow handling
* so reimplement it here - see Bug 557380
*/
{
normalize_invert (drawable, dogvals.normalize, maxval, dogvals.invert);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable_id, TRUE);
gimp_drawable_update (drawable_id, x1, y1, width, height);
}
}
static void
compute_difference (GimpDrawable *drawable,
GimpDrawable *drawable1,
GimpDrawable *drawable2,
guchar *maxval)
{
GimpPixelRgn src1_rgn, src2_rgn, dest_rgn;
gint width, height;
gint bpp;
gpointer pr;
gint x, y, k;
gint x1, y1;
gboolean has_alpha;
*maxval = 0;
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
bpp = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
gimp_pixel_rgn_init (&src1_rgn,
drawable1, 0, 0, drawable1->width, drawable1->height,
FALSE, FALSE);
gimp_pixel_rgn_init (&src2_rgn,
drawable2, 0, 0, drawable1->width, drawable1->height,
FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn,
drawable, 0, 0, drawable->width, drawable->height,
TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (3, &src1_rgn, &src2_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
guchar *src1 = src1_rgn.data;
guchar *src2 = src2_rgn.data;
guchar *dest = dest_rgn.data;
gint row = src1_rgn.y - y1;
for (y = 0; y < src1_rgn.h; y++, row++)
{
guchar *s1 = src1;
guchar *s2 = src2;
guchar *d = dest;
gint col = src1_rgn.x - x1;
for (x = 0; x < src1_rgn.w; x++, col++)
{
if (has_alpha)
{
for (k = 0; k < bpp-1; k++)
{
d[k] = CLAMP0255 (s1[k] - s2[k]);
*maxval = MAX (d[k], *maxval);
}
}
else
{
for (k = 0; k < bpp; k++)
{
d[k] = CLAMP0255 (s1[k] - s2[k]);
*maxval = MAX (d[k], *maxval);
}
}
s1 += bpp;
s2 += bpp;
d += bpp;
}
src1 += src1_rgn.rowstride;
src2 += src2_rgn.rowstride;
dest += dest_rgn.rowstride;
}
}
}
static void
normalize_invert (GimpDrawable *drawable,
gboolean normalize,
guint maxval,
gboolean invert)
{
GimpPixelRgn src_rgn, dest_rgn;
gint bpp;
gpointer pr;
gint x, y, k;
gint x1, y1;
gint width, height;
gboolean has_alpha;
gdouble factor;
if (normalize && maxval != 0) {
factor = 255.0 / maxval;
}
else
factor = 1.0;
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
bpp = drawable->bpp;
has_alpha = gimp_drawable_has_alpha(drawable->drawable_id);
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);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
guchar *src = src_rgn.data;
guchar *dest = dest_rgn.data;
gint row = src_rgn.y - y1;
for (y = 0; y < src_rgn.h; y++, row++)
{
guchar *s = src;
guchar *d = dest;
gint col = src_rgn.x - x1;
for (x = 0; x < src_rgn.w; x++, col++)
{
if (has_alpha)
{
for (k = 0; k < bpp-1; k++)
{
d[k] = factor * s[k];
if (invert)
d[k] = 255 - d[k];
}
}
else
{
for (k = 0; k < bpp; k++)
{
d[k] = factor * s[k];
if (invert)
d[k] = 255 - d[k];
}
}
s += bpp;
d += bpp;
}
src += src_rgn.rowstride;
dest += dest_rgn.rowstride;
}
}
}
static void
gauss_rle (GimpDrawable *drawable,
gdouble radius,
gint pass,
gboolean show_progress)
{
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;
gint i, row, col, b;
gint start, end;
gdouble progress, max_progress;
gint *curve;
gint *sum = NULL;
gint val;
gint length;
gint initial_p, initial_m;
gdouble std_dev;
if (radius <= 0.0)
return;
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
bytes = drawable->bpp;
has_alpha = gimp_drawable_has_alpha(drawable->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 = 0.0;
max_progress = 2 * width * height;
/* First the vertical pass */
radius = fabs (radius) + 1.0;
std_dev = sqrt (-(radius * radius) / (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, height);
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)
separate_alpha (dest, height, bytes);
gimp_pixel_rgn_set_col (&dest_rgn, dest, col + x1, y1, height);
if (show_progress)
{
progress += height;
if ((col % 32) == 0)
gimp_progress_update (0.5 * (pass + (progress / 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 */
for (row = 0; row < height; row++)
{
gimp_pixel_rgn_get_row (&src_rgn, src, x1, row + y1, width);
if (has_alpha)
multiply_alpha (src, width, 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, width);
if (show_progress)
{
progress += width;
if ((row % 32) == 0)
gimp_progress_update (0.5 * (pass + (progress / max_progress)));
}
}
/* 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, width, height);
/* 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;
}
}
static void
preview_update_preview (GimpPreview *preview,
GimpDrawable *drawable)
{
gint x1, y1;
gint width, height;
gint bpp;
guchar *buffer;
GimpPixelRgn src_rgn;
GimpPixelRgn preview_rgn;
gint32 image_id, src_image_id;
gint32 preview_id;
GimpDrawable *preview_drawable;
bpp = gimp_drawable_bpp (drawable->drawable_id);
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
buffer = g_new (guchar, width * height * bpp);
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_get_rect (&src_rgn, buffer,
x1, y1, width, height);
/* set up gimp drawable for rendering preview into */
src_image_id = gimp_item_get_image (drawable->drawable_id);
image_id = gimp_image_new (width, height,
gimp_image_base_type (src_image_id));
preview_id = gimp_layer_new (image_id, "preview", width, height,
gimp_drawable_type (drawable->drawable_id),
100,
gimp_image_get_default_new_layer_mode (image_id));
preview_drawable = gimp_drawable_get (preview_id);
gimp_image_insert_layer (image_id, preview_id, -1, 0);
gimp_layer_set_offsets (preview_id, 0, 0);
gimp_pixel_rgn_init (&preview_rgn, preview_drawable,
0, 0, width, height, TRUE, TRUE);
gimp_pixel_rgn_set_rect (&preview_rgn, buffer,
0, 0, width, height);
gimp_drawable_flush (preview_drawable);
gimp_drawable_merge_shadow (preview_id, TRUE);
gimp_drawable_update (preview_id, 0, 0, width, height);
dog (image_id, preview_drawable, dogvals.inner, dogvals.outer, FALSE);
gimp_pixel_rgn_get_rect (&preview_rgn, buffer,
0, 0, width, height);
gimp_preview_draw_buffer (preview, buffer, width * bpp);
gimp_image_delete (image_id);
g_free (buffer);
}
static void
change_radius_callback (GtkWidget *coord,
gpointer data)
{
GimpPreview *preview = GIMP_PREVIEW (data);
dogvals.inner = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (coord), 0);
dogvals.outer = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (coord), 1);
gimp_preview_invalidate (preview);
}
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