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gimp/plug-ins/common/edge.c
Michael Natterer b10adabb5e Added parent window API to the GimpProgress interface and to the libgimp 
2005-09-09  Michael Natterer  <mitch@gimp.org>

	Added parent window API to the GimpProgress interface and to
	the libgimp progress stuff. Might look strange, but does
	the right thing in almost all cases (image window, file dialog,
	script-fu dialog etc). Fixes bug #62988.

	* app/core/gimpprogress.[ch]: added GimpProgress::get_window()
	which should return a toplevel window ID if the progress is in a
	window that wants to be the transient parent of plug-in dialogs.

	* app/widgets/gimpwidgets-utils.[ch] (gimp_window_get_native): new
	function which returns the window handle of a GtkWindow's GdkWindow.

	* app/widgets/gimpfiledialog.c: implement ::get_window().

	* app/display/gimpdisplay.[ch]: ditto. Removed window handle API.

	* app/gui/gui-vtable.c: changed accordingly.

	* libgimpbase/gimpbaseenums.[ch] (enum GimpProgressCommand):
	added GIMP_PROGRESS_COMMAND_GET_WINDOW.

	* app/plug-in/plug-in-progress.[ch] (plug_in_progress_get_window):
	new function. Also renamed some functions to match the
	GimpProgress interface, and not the legacy PDB procedure names.

	* tools/pdbgen/pdb/progress.pdb
	* app/core/gimppdbprogress.c: implement get_window() on both
	sides of the wire, keeping backward compatibility (hopefully).

	* libgimp/gimpprogress.[ch]: deprecated gimp_progress_install()
	and added gimp_progress_install_vtable() which takes a vtable with
	padding to be extensible. Added get_window() vtable entry and
	dispatch it accordingly. Also added pulse() which was implemented
	in a hackish way before. Everything is of course backward
	compatible.

	* libgimp/gimpprogressbar.c: inmplement the get_window() stuff
	so a plug-in dialog containing a progress can be the transient
	parent of another dialog in another plug-in.

	* libgimp/gimpui.[ch] (gimp_ui_get_progress_window): new function
	which returns a foreign GdkWindow of this plug-ins progress
	window.

	Renamed gimp_window_set_transient_for_default_display() to
	gimp_window_set_transient() and make it use the progress' window
	handle instead of the display's (which is the right thing to do in
	almost all cases).

	* libgimp/gimp.def
	* libgimp/gimpui.def: add the new functions.

	* tools/pdbgen/enums.pl
	* app/pdb/internal_procs.c
	* app/pdb/progress_cmds.c
	* libgimp/gimpprogress_pdb.[ch]: regenerated.

	* libgimp/gimpexport.c
	* plug-ins/*/*.c: follow API change.
2005-09-09 18:07:31 +00:00

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/* edge filter for the GIMP
* -Peter Mattis
*
* This filter performs edge detection on the input image.
* The code for this filter is based on "pgmedge", a program
* that is part of the netpbm package.
*
* 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.
*/
/* pgmedge.c - edge-detect a portable graymap
*
* Copyright (C) 1989 by Jef Poskanzer.
*/
/*
* Ported to GIMP Plug-in API 1.0
* version 1.07
* This version requires GIMP v0.99.10 or above.
*
* This plug-in performs edge detection. The code is based on edge.c
* for GIMP 0.54 by Peter Mattis.
*
* Eiichi Takamori <taka@ma1.seikyou.ne.jp>
* http://ha1.seikyou.ne.jp/home/taka/gimp/
*
* Tips: you can enter arbitrary value into entry.
* (not bounded between 1.0 and 10.0)
*/
/* 29 July 2003 Dave Neary <bolsh@gimp.org>
* Added more edge detection routines, from the thin_line
* plug-in by iccii
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#ifdef RCSID
static gchar rcsid[] = "$Id$";
#endif
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-edge"
#define PLUG_IN_BINARY "edge"
#define TILE_CACHE_SIZE 48
enum
{
SOBEL,
PREWITT,
GRADIENT,
ROBERTS,
DIFFERENTIAL,
LAPLACE
};
typedef struct
{
gdouble amount;
gint edgemode;
gint wrapmode;
gboolean update_preview;
} EdgeVals;
/*
* 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 edge (GimpDrawable *drawable);
static gboolean edge_dialog (GimpDrawable *drawable);
static void edge_preview_update (GimpPreview *preview);
static gint edge_detect (const guchar *data);
static gint prewitt (const guchar *data);
static gint gradient (const guchar *data);
static gint roberts (const guchar *data);
static gint differential (const guchar *data);
static gint laplace (const guchar *data);
static gint sobel (const guchar *data);
/***** Local vars *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static EdgeVals evals =
{
2.0, /* amount */
SOBEL, /* Edge detection algorithm */
GIMP_PIXEL_FETCHER_EDGE_SMEAR, /* wrapmode */
TRUE /* update_preview */
};
/***** 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, "amount", "Edge detection amount" },
{ GIMP_PDB_INT32, "wrapmode", "Edge detection behavior: { WRAP (0), SMEAR (1), BLACK (2) }" },
{ GIMP_PDB_INT32, "edgemode", "Edge detection algorithm: { SOBEL (0), PREWITT (1), GRADIENT (2), ROBERTS (3), DIFFERENTIAL (4), LAPLACE (5) }" }
};
const gchar *help_string =
"Perform edge detection on the contents of the specified drawable."
"AMOUNT is an arbitrary constant, WRAPMODE is like displace plug-in "
"(useful for tilable image). EDGEMODE sets the kind of matrix "
"transform applied to the pixels, SOBEL was the method used in older "
"versions.";
gimp_install_procedure (PLUG_IN_PROC,
"Perform edge detection on the contents of the specified drawable",
help_string,
"Peter Mattis & (ported to 1.0 by) Eiichi Takamori",
"Peter Mattis",
"1996",
N_("_Edge..."),
"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[1];
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpDrawable *drawable;
run_mode = param[0].data.d_int32;
INIT_I18N ();
/* 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;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &evals);
/* First acquire information with a dialog */
if (! edge_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5 && nparams != 6)
{
status = GIMP_PDB_CALLING_ERROR;
}
if (status == GIMP_PDB_SUCCESS)
{
evals.amount = param[3].data.d_float;
evals.wrapmode = param[4].data.d_int32;
evals.edgemode = nparams > 5 ? param[5].data.d_int32 : SOBEL;
}
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 (_("Edge Detection..."));
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* run the edge effect */
edge (drawable);
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 (EdgeVals));
}
else
{
/* gimp_message ("edge: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
/********************************************************/
/* Edge Detection main */
/********************************************************/
static void
edge (GimpDrawable *drawable)
{
GimpPixelRgn src_rgn, dest_rgn;
gpointer pr;
GimpPixelFetcher *pft;
guchar *srcrow, *src;
guchar *destrow, *dest;
guchar pix00[4], pix01[4], pix02[4];
guchar pix10[4], pix11[4], pix12[4];
guchar pix20[4], pix21[4], pix22[4];
glong width, height;
gint alpha;
gboolean has_alpha;
gint chan;
gint x, y;
gint x1, y1, x2, y2;
gint maxval;
gint cur_progress;
gint max_progress;
if (evals.amount < 1.0)
evals.amount = 1.0;
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_pixel_fetcher_set_edge_mode (pft, evals.wrapmode);
gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
alpha = gimp_drawable_bpp (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
if (has_alpha)
alpha--;
maxval = 255;
cur_progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, x2-x1, y2-y1, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable, x1, y1, x2-x1, y2-y1, TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
srcrow = src_rgn.data;
destrow = dest_rgn.data;
for (y = dest_rgn.y;
y < (dest_rgn.y + dest_rgn.h);
y++, srcrow += src_rgn.rowstride, destrow += dest_rgn.rowstride)
{
src = srcrow;
dest = destrow;
for (x = dest_rgn.x;
x < (dest_rgn.x + dest_rgn.w);
x++, src += src_rgn.bpp, dest += dest_rgn.bpp)
{
if (dest_rgn.x < x && x < dest_rgn.x + dest_rgn.w - 2 &&
dest_rgn.y < y && y < dest_rgn.y + dest_rgn.h - 2)
{
/*
* 3x3 kernel is inside of the tile -- do fast
* version
*/
for (chan = 0; chan < alpha; chan++)
{
/* get the 3x3 kernel into a guchar array,
* and send it to edge_detect */
guchar kernel[9];
gint i,j;
#define PIX(X,Y) src[ (Y-1)*(int)src_rgn.rowstride + (X-1)*(int)src_rgn.bpp + chan ]
/* make convolution */
for(i = 0; i < 3; i++)
for(j = 0; j < 3; j++)
kernel[3*i + j] = PIX(i,j);
#undef PIX
dest[chan] = edge_detect (kernel);
}
}
else
{
/*
* The kernel is not inside of the tile -- do slow
* version
*/
gimp_pixel_fetcher_get_pixel (pft, x-1, y-1, pix00);
gimp_pixel_fetcher_get_pixel (pft, x , y-1, pix10);
gimp_pixel_fetcher_get_pixel (pft, x+1, y-1, pix20);
gimp_pixel_fetcher_get_pixel (pft, x-1, y , pix01);
gimp_pixel_fetcher_get_pixel (pft, x , y , pix11);
gimp_pixel_fetcher_get_pixel (pft, x+1, y , pix21);
gimp_pixel_fetcher_get_pixel (pft, x-1, y+1, pix02);
gimp_pixel_fetcher_get_pixel (pft, x , y+1, pix12);
gimp_pixel_fetcher_get_pixel (pft, x+1, y+1, pix22);
for (chan = 0; chan < alpha; chan++)
{
guchar kernel[9];
kernel[0] = pix00[chan];
kernel[1] = pix01[chan];
kernel[2] = pix02[chan];
kernel[3] = pix10[chan];
kernel[4] = pix11[chan];
kernel[5] = pix12[chan];
kernel[6] = pix20[chan];
kernel[7] = pix21[chan];
kernel[8] = pix22[chan];
dest[chan] = edge_detect (kernel);
}
}
if (has_alpha)
dest[alpha] = src[alpha];
}
}
cur_progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) cur_progress / (double) max_progress);
}
gimp_pixel_fetcher_destroy (pft);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
}
/* *********************** Edge Detection ******************** */
/*
* Edge detect switcher function
*/
static gint
edge_detect (const guchar *data)
{
gint ret;
switch (evals.edgemode)
{
case SOBEL:
ret = sobel (data);
break;
case PREWITT:
ret = prewitt (data);
break;
case GRADIENT:
ret = gradient (data);
break;
case ROBERTS:
ret = roberts (data);
break;
case DIFFERENTIAL:
ret = differential (data);
break;
case LAPLACE:
ret = laplace (data);
break;
default:
ret = -1;
break;
}
return CLAMP0255 (ret);
}
/*
* Sobel Edge detector
*/
static gint
sobel (const guchar *data)
{
gint v_kernel[9] = {-1, 0, 1,
-2, 0, 2,
-1, 0, 1};
gint h_kernel[9] = {-1, -2, -1,
0, 0, 0,
1, 2, 1};
gint i;
gint v_grad, h_grad;
v_grad = 0;
h_grad = 0;
for (i = 0; i < 9; i++)
{
v_grad += v_kernel[i] * data[i];
h_grad += h_kernel[i] * data[i];
}
return sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount);
}
/*
* Edge detector via template matting
* -- Prewitt
*/
static gint
prewitt (const guchar *data)
{
gint k, max;
gint m[8];
m[0] = data [0] + data [1] + data [2]
+ data [3] - 2*data [4] + data [5]
- data [6] - data [7] - data [8];
m[1] = data [0] + data [1] + data [2]
+ data [3] - 2*data [4] - data [5]
+ data [6] - data [7] - data [8];
m[2] = data [0] + data [1] - data [2]
+ data [3] - 2*data [4] - data [5]
+ data [6] + data [7] - data [8];
m[3] = data [0] - data [1] - data [2]
+ data [3] - 2*data [4] - data [5]
+ data [6] + data [7] + data [8];
m[4] = - data [0] - data [1] - data [2]
+ data [3] - 2*data [4] + data [5]
+ data [6] + data [7] + data [8];
m[5] = - data [0] - data [1] + data [2]
- data [3] - 2*data [4] + data [5]
+ data [6] + data [7] + data [8];
m[6] = - data [0] + data [1] + data [2]
- data [3] - 2*data [4] + data [5]
- data [6] + data [7] + data [8];
m[7] = data [0] + data [1] + data [2]
- data [3] - 2*data [4] + data [5]
- data [6] - data [7] + data [8];
max = 0;
for (k = 0; k < 8; k++)
if (max < m[k])
max = m[k];
return evals.amount * max;
}
/*
* Gradient Edge detector
*/
static gint
gradient (const guchar *data)
{
gint v_kernel[9] = { 0, 0, 0,
0, 4, -4,
0, 0, 0};
gint h_kernel[9] = { 0, 0, 0,
0, -4, 0,
0, 4, 0};
gint i;
gint v_grad, h_grad;
v_grad = 0;
h_grad = 0;
for (i = 0; i < 9; i++)
{
v_grad += v_kernel[i] * data[i];
h_grad += h_kernel[i] * data[i];
}
return sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount);
}
/*
* Roberts Edge detector
*/
static gint
roberts (const guchar *data)
{
gint v_kernel[9] = {0, 0, 0,
0, 4, 0,
0, 0, -4};
gint h_kernel[9] = {0, 0, 0,
0, 0, 4,
0, -4, 0};
gint i;
gint v_grad, h_grad;
v_grad = 0;
h_grad = 0;
for (i = 0; i < 9; i++)
{
v_grad += v_kernel[i] * data[i];
h_grad += h_kernel[i] * data[i];
}
return sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount);
}
/*
* Differential Edge detector
*/
static gint
differential (const guchar *data)
{
gint v_kernel[9] = { 0, 0, 0,
0, 2, -2,
0, 2, -2};
gint h_kernel[9] = { 0, 0, 0,
0, -2, -2,
0, 2, 2};
gint i;
gint v_grad, h_grad;
v_grad = 0;
h_grad = 0;
for (i = 0; i < 9; i++)
{
v_grad += v_kernel[i] * data[i];
h_grad += h_kernel[i] * data[i];
}
return sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount);
}
/*
* Laplace Edge detector
*/
static gint
laplace (const guchar *data)
{
gint kernel[9] = { 1, 1, 1,
1, -8, 1,
1, 1, 1};
gint i;
gint grad;
grad = 0;
for (i = 0; i < 9; i++)
{
grad += kernel[i] * data[i];
}
return grad * evals.amount;
}
/*******************************************************/
/* Dialog */
/*******************************************************/
static gboolean
edge_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *combo;
GtkWidget *toggle;
GtkObject *scale_data;
GSList *group = NULL;
gboolean run;
gboolean use_wrap = (evals.wrapmode == GIMP_PIXEL_FETCHER_EDGE_WRAP);
gboolean use_smear = (evals.wrapmode == GIMP_PIXEL_FETCHER_EDGE_SMEAR);
gboolean use_black = (evals.wrapmode == GIMP_PIXEL_FETCHER_EDGE_BLACK);
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Edge Detection"), 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, &evals.update_preview);
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), preview);
gtk_widget_show (preview);
g_signal_connect (preview, "invalidated",
G_CALLBACK (edge_preview_update),
NULL);
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);
combo = gimp_int_combo_box_new (_("Sobel"), SOBEL,
_("Prewitt"), PREWITT,
_("Gradient"), GRADIENT,
_("Roberts"), ROBERTS,
_("Differential"), DIFFERENTIAL,
_("Laplace"), LAPLACE,
NULL);
gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo),
evals.edgemode,
G_CALLBACK (gimp_int_combo_box_get_active),
&evals.edgemode);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("_Algorithm:"), 0.0, 0.5,
combo, 2, FALSE);
g_signal_connect_swapped (combo, "changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* Label, scale, entry for evals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("A_mount:"), 100, 0,
evals.amount, 1.0, 10.0, 0.1, 1.0, 1,
FALSE, 1.0, G_MAXFLOAT,
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);
/* Radio buttons WRAP, SMEAR, BLACK */
hbox = gtk_hbox_new (FALSE, 4);
gtk_table_attach (GTK_TABLE (table), hbox, 0, 3, 2, 3,
GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show (hbox);
toggle = gtk_radio_button_new_with_mnemonic (group, _("_Wrap"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_wrap);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&use_wrap);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_radio_button_new_with_mnemonic (group, _("_Smear"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_smear);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&use_smear);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_radio_button_new_with_mnemonic (group, _("_Black"));
group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_black);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&use_black);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
if (use_wrap)
evals.wrapmode = GIMP_PIXEL_FETCHER_EDGE_WRAP;
else if (use_smear)
evals.wrapmode = GIMP_PIXEL_FETCHER_EDGE_SMEAR;
else if (use_black)
evals.wrapmode = GIMP_PIXEL_FETCHER_EDGE_BLACK;
return run;
}
static void
edge_preview_update (GimpPreview *preview)
{
/* drawable */
GimpDrawable *drawable;
glong bytes;
gint alpha;
gboolean has_alpha;
/* preview */
guchar *src = NULL; /* Buffer to hold source image */
guchar *render_buffer = NULL; /* Buffer to hold rendered image */
guchar *dest;
gint width; /* Width of preview widget */
gint height; /* Height of preview widget */
gint x1; /* Upper-left X of preview */
gint y1; /* Upper-left Y of preview */
GimpPixelRgn srcPR; /* Pixel regions */
/* algorithm */
gint x, y;
/* Get drawable info */
drawable =
gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));
bytes = gimp_drawable_bpp (drawable->drawable_id);
alpha = bytes;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
if (has_alpha)
alpha--;
/*
* Setup for filter...
*/
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
/* initialize pixel regions */
gimp_pixel_rgn_init (&srcPR, drawable,
x1, y1, width, height, FALSE, FALSE);
src = g_new (guchar, width * height * bytes);
render_buffer = g_new (guchar, width * height * bytes);
/* render image */
gimp_pixel_rgn_get_rect(&srcPR, src, x1, y1, width, height);
dest = render_buffer;
/* render algorithm */
for (y = 0 ; y < height ; y++)
for (x = 0 ; x < width ; x++)
{
gint chan;
for (chan = 0; chan < alpha; chan++)
{
guchar kernel[9];
#define SRC(X,Y) src[bytes * (CLAMP((X), 0, width-1) + \
width * CLAMP((Y), 0, height-1)) + chan]
kernel[0] = SRC (x - 1, y - 1);
kernel[1] = SRC (x - 1, y );
kernel[2] = SRC (x - 1, y + 1);
kernel[3] = SRC (x , y - 1);
kernel[4] = SRC (x , y );
kernel[5] = SRC (x , y + 1);
kernel[6] = SRC (x + 1, y - 1);
kernel[7] = SRC (x + 1, y );
kernel[8] = SRC (x + 1, y + 1);
#undef SRC
dest[chan] = edge_detect (kernel);
}
if (has_alpha)
dest[alpha] = src[bytes * (x + width * y) + alpha];
dest += bytes;
}
/*
* Draw the preview image on the screen...
*/
gimp_preview_draw_buffer (preview, render_buffer, width * bytes);
g_free (render_buffer);
g_free (src);
}
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