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gimp/plug-ins/common/edge.c

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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.
*/
/* 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)
*
* Changes from version 1.06 to version 1.07:
* - Added entry
* - Cleaned up code a bit
*
* Differences from Peter Mattis's original `edge' plug-in:
* - Added Wrapmode. (useful for tilable images)
* - Enhanced speed in this version.
* - It works with the alpha channel.
*/
/* 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 <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.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 TILE_CACHE_SIZE 48
enum
{
SOBEL,
PREWITT,
GRADIENT,
ROBERTS,
DIFFERENTIAL,
LAPLACE,
};
typedef struct
{
gdouble amount;
gint edgemode;
gint wrapmode;
} 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 gint edge_dialog (GimpDrawable *drawable);
static gint edge_detect (guchar *data);
static gint prewitt (guchar *data);
static gint gradient (guchar *data);
static gint roberts (guchar *data);
static gint differential (guchar *data);
static gint laplace (guchar *data);
static gint sobel (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 */
};
/***** 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) }" }
};
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_edge",
"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_("<Image>/Filters/Edge-Detect/_Edge..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
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_edge", &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_edge", &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_edge", &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)
{
/*
* this function is too long, so I must split this into a few
* functions later ... -- taka
*/
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, has_alpha, 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);
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];
int 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 (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 ret;
}
/*
* Sobel Edge detector
*/
static gint
sobel (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 CLAMP(sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount), 0, 255);
}
/*
* Edge detector via template matting
* -- Prewitt
*/
static gint
prewitt (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 CLAMP(evals.amount * max, 0, 255);
}
/*
* Gradient Edge detector
*/
static gint
gradient (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 CLAMP(sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount), 0, 255);
}
/*
* Roberts Edge detector
*/
static gint
roberts (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 CLAMP(sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount), 0, 255);
}
/*
* Differential Edge detector
*/
static gint
differential (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 CLAMP(sqrt (v_grad * v_grad * evals.amount +
h_grad * h_grad * evals.amount), 0, 255);
}
/*
* Laplace Edge detector
*/
static gint
laplace (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 CLAMP(grad * evals.amount, 0, 255);
}
/*******************************************************/
/* Dialog */
/*******************************************************/
static gint
edge_dialog (GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *hbox;
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 ("edge", FALSE);
dlg = gimp_dialog_new (_("Edge Detection"), "edge",
NULL, 0,
gimp_standard_help_func, "plug-in-edge",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
/* compression */
frame = gimp_int_radio_group_new (TRUE, _("Algorithm"),
G_CALLBACK (gimp_radio_button_update),
&evals.edgemode, evals.edgemode,
_("_Sobel"), SOBEL, NULL,
_("_Prewitt"), PREWITT, NULL,
_("_Gradient"), GRADIENT, NULL,
_("_Roberts"), ROBERTS, NULL,
_("_Differential"), DIFFERENTIAL, NULL,
_("_Laplace"), LAPLACE, NULL,
NULL);
gtk_box_pack_start_defaults (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame);
gtk_widget_show (frame);
/* parameter settings */
frame = gtk_frame_new (_("Parameter Settings"));
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 4);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
/* Label, scale, entry for evals.amount */
scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("_Amount:"), 100, 0,
evals.amount, 1.0, 10.0, 0.1, 1.0, 1,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (scale_data, "value_changed",
G_CALLBACK (gimp_double_adjustment_update),
&evals.amount);
/* Radio buttons WRAP, SMEAR, BLACK */
hbox = gtk_hbox_new (FALSE, 4);
gtk_table_attach (GTK_TABLE (table), hbox, 0, 3, 1, 2,
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);
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);
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);
gtk_widget_show (table);
gtk_widget_show (frame);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
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;
}
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