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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.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
/*
* 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.
*/
#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"
#ifdef RCSID
static gchar rcsid[] = "$Id$";
#endif
/* Some useful macros */
#define TILE_CACHE_SIZE 48
enum
{
WRAP,
SMEAR,
BLACK
};
typedef struct
{
gdouble amount;
gint wrapmode;
} EdgeVals;
typedef struct
{
gint run;
} EdgeInterface;
typedef struct
{
GimpTile *tile;
gint row, col; /* tile's row, col */
gint bpp;
gint tile_width, tile_height;
GimpDrawable *drawable;
gint drawable_width, drawable_height;
} TileBuf;
/*
* Function prototypes.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void edge (GimpDrawable *drawable);
static gint edge_dialog (GimpDrawable *drawable);
static long long_sqrt (long n);
static void init_tile_buf (TileBuf *buf,
GimpDrawable *drawable);
static void get_tile_pixel (TileBuf *buf,
gint x,
gint y,
guchar *pixel,
gint wrapmode);
static void end_tile_buf (TileBuf *buf);
/***** Local vars *****/
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static EdgeVals evals =
{
2.0, /* amount */
SMEAR /* wrapmode */
};
static EdgeInterface eint =
{
FALSE /* run */
};
/***** 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) }" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
gchar *help_string =
"Perform edge detection on the contents of the specified drawable. It "
"applies, I think, convolution with 3x3 kernel. AMOUNT is an arbitrary "
"constant, WRAPMODE is like displace plug-in (useful for tilable image).";
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,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunModeType run_mode;
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);
*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:
INIT_I18N_UI();
/* 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)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
evals.amount = param[3].data.d_float;
evals.wrapmode = param[4].data.d_int32;
}
INIT_I18N();
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_edge", &evals);
INIT_I18N();
break;
default:
break;
}
/* make sure the drawable exist and is not indexed */
if (gimp_drawable_is_rgb (drawable->id) ||
gimp_drawable_is_gray (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);
}
/*********************************************************************
TileBuf Util Routines: Util routines for getting arbitrary pixel
CAUTION -- the tile is read only !!
**********************************************************************/
static void
init_tile_buf (TileBuf *buf,
GimpDrawable *drawable)
{
buf->tile = NULL;
buf->col = 0;
buf->row = 0;
if (gimp_drawable_is_rgb (drawable->id))
buf->bpp = 3;
else
buf->bpp = 1;
buf->tile_width = gimp_tile_width();
buf->tile_height = gimp_tile_height();
buf->drawable = drawable;
buf->drawable_width = gimp_drawable_width(drawable->id);
buf->drawable_height = gimp_drawable_height(drawable->id);
}
static void
get_tile_pixel (TileBuf *buf,
gint x,
gint y,
guchar *pixel,
gint wrapmode)
{
gint b;
gint offx, offy;
gint row, col;
guchar *ptr;
if (x < 0 || x >= buf->drawable_width ||
y < 0 || y >= buf->drawable_height)
switch (wrapmode)
{
case WRAP:
if (x < 0 || x >= buf->drawable_width)
{
x %= buf->drawable_width;
if (x < 0)
x += buf->drawable_width;
}
if (y < 0 || y >= buf->drawable_height)
{
y %= buf->drawable_height;
if (y < 0)
y += buf->drawable_height;
}
break;
case SMEAR:
if (x < 0)
x = 0;
if (x >= buf->drawable_width)
x = buf->drawable_width - 1;
if (y < 0)
y = 0;
if (y >= buf->drawable_height)
y = buf->drawable_height - 1;
break;
case BLACK:
if (x < 0 || x >= buf->drawable_width ||
y < 0 || y >= buf->drawable_height)
{
for (b = 0; b < buf->bpp; b++)
pixel[b] = 0;
return;
}
break;
default:
return;
}
col = x / buf->tile_width;
offx = x % buf->tile_width;
row = y / buf->tile_height;
offy = y % buf->tile_height;
/* retrieve tile */
if (!buf->tile || col != buf->col || row != buf->row)
{
if(buf->tile)
gimp_tile_unref (buf->tile, FALSE);
buf->col = col;
buf->row = row;
buf->tile = gimp_drawable_get_tile (buf->drawable, FALSE, row, col);
gimp_tile_ref (buf->tile);
}
/* retrieve target pixel */
ptr = buf->tile->data + (offy * buf->tile->ewidth + offx) * buf->tile->bpp;
for(b = 0; b < buf->bpp; b++)
pixel[b] = ptr[b];
}
static void
end_tile_buf (TileBuf *buf)
{
if (buf->tile)
gimp_tile_unref (buf->tile, FALSE);
}
/**********************************************************************
TileBuf Util Routines End
**********************************************************************/
static long
long_sqrt (long n)
{
#define lsqrt_max4pow (1UL << 30)
/* lsqrt_max4pow is the (machine-specific) largest power of 4 that can
* be represented in an unsigned long.
*
* Compute the integer square root of the integer argument n
* Method is to divide n by x computing the quotient x and remainder r
* Notice that the divisor x is changing as the quotient x changes
*
* Instead of shifting the dividend/remainder left, we shift the
* quotient/divisor right. The binary point starts at the extreme
* left, and shifts two bits at a time to the extreme right.
*
* The residue contains n-x^2. (Within these comments, the ^ operator
* signifies exponentiation rather than exclusive or. Also, the /
* operator returns fractions, rather than truncating, so 1/4 means
* one fourth, not zero.)
*
* Since (x + 1/2)^2 == x^2 + x + 1/4,
* n - (x + 1/2)^2 == (n - x^2) - (x + 1/4)
* Thus, we can increase x by 1/2 if we decrease (n-x^2) by (x+1/4)
*/
gulong residue; /* n - x^2 */
gulong root; /* x + 1/4 */
gulong half; /* 1/2 */
residue = n; /* n - (x = 0)^2, with suitable alignment */
/*
* if the correct answer fits in two bits, pull it out of a magic hat
*/
if (residue <= 12)
return (0x03FFEA94 >> (residue *= 2)) & 3;
root = lsqrt_max4pow; /* x + 1/4, shifted all the way left */
/* half = root + root; 1/2, shifted likewise */
/*
* Unwind iterations corresponding to leading zero bits
*/
while (root > residue)
root >>= 2;
/*
* Unwind the iteration corresponding to the first one bit
* Operations have been rearranged and combined for efficiency
* Initialization of half is folded into this iteration
*/
residue -= root; /* Decrease (n-x^2) by (0+1/4) */
half = root >> 2; /* 1/4, with binary point shifted right 2 */
root += half; /* x=1. (root is now (x=1)+1/4.) */
half += half; /* 1/2, properly aligned */
/*
* Normal loop (there is at least one iteration remaining)
*/
do
{
if (root <= residue) /* Whenever we can, */
{
residue -= root; /* decrease (n-x^2) by (x+1/4) */
root += half; /* increase x by 1/2 */
}
half >>= 2; /* Shift binary point 2 places right */
root -= half; /* x{ +1/2 } +1/4 - 1/8 == x { +1/2 } 1/8 */
root >>= 1; /* 2x{ +1 } +1/4, shifted right 2 places */
}
while (half); /* When 1/2 == 0, bin. point is at far right */
/*
* round up if (x+1/2)^2 < n
*/
if (root < residue)
++root;
/*
* Guaranteed to be correctly rounded (or truncated)
*/
return root;
}
/********************************************************/
/* 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;
TileBuf buf;
guchar *srcrow, *src;
guchar *destrow, *dest;
guchar pix00[3], pix01[3], pix02[3];
guchar pix10[3],/*pix11[3],*/ pix12[3];
guchar pix20[3], pix21[3], pix22[3];
glong width, height;
gint alpha, has_alpha, chan;
gint x, y;
gint x1, y1, x2, y2;
glong sum1, sum2;
glong sum, scale;
gint maxval;
gint cur_progress;
gint max_progress;
gint wrapmode;
if (evals.amount < 1.0)
evals.amount = 1.0;
init_tile_buf (&buf, drawable);
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
width = gimp_drawable_width (drawable->id);
height = gimp_drawable_height (drawable->id);
alpha = gimp_drawable_bpp (drawable->id);
has_alpha = gimp_drawable_has_alpha (drawable->id);
if (has_alpha)
alpha--;
maxval = 255;
scale = (10 << 16) / evals.amount;
wrapmode = evals.wrapmode;
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 - 1 &&
dest_rgn.y < y && y < dest_rgn.y + dest_rgn.h - 1)
{
/*
** 3x3 kernel is inside of the tile -- do fast
** version
*/
for (chan = 0; chan < alpha; chan++)
{
/*
* PIX(1,1) is the current pixel, so
* e.g. PIX(0,0) means 1 above and 1 left pixel.
*
* There were casting to `long' in GIMP 0.54
* edge code, but I think `guchar' should be
* extended to `int' with minus operators, so
* there's no need to cast to `long'. Both sum1
* and sum2 will be between -4*255 to 4*255
*
* -- taka
*/
#define PIX(X,Y) src[ (Y-1)*(int)src_rgn.rowstride + (X-1)*(int)src_rgn.bpp + chan ]
/* make convolution */
sum1 = (PIX(2,0) - PIX(0,0)) +
2 * (PIX(2,1) - PIX(0,1)) +
(PIX(2,2) - PIX(2,0));
sum2 = (PIX(0,2) - PIX(0,0)) +
2 * (PIX(1,2) - PIX(1,0)) +
(PIX(2,2) - PIX(2,0));
#undef PIX
/* common job ... */
sum = long_sqrt ((long) sum1 * sum1 + (long) sum2 * sum2);
sum = (sum * scale) >> 16; /* arbitrary scaling factor */
if (sum > maxval)
sum = maxval;
dest[chan] = sum;
}
}
else
{
/*
** The kernel is not inside of the tile -- do slow
** version
*/
/*
* When the kernel intersects the boundary of the
* image, get_tile_pixel() will (should) do the
* right work with `wrapmode'.
*/
get_tile_pixel (&buf, x-1, y-1, pix00, wrapmode);
get_tile_pixel (&buf, x , y-1, pix10, wrapmode);
get_tile_pixel (&buf, x+1, y-1, pix20, wrapmode);
get_tile_pixel (&buf, x-1, y , pix01, wrapmode);
get_tile_pixel (&buf, x+1, y , pix21, wrapmode);
get_tile_pixel (&buf, x-1, y+1, pix02, wrapmode);
get_tile_pixel (&buf, x , y+1, pix12, wrapmode);
get_tile_pixel (&buf, x+1, y+1, pix22, wrapmode);
for (chan = 0; chan < alpha; chan++)
{
/* make convolution */
sum1 = (pix20[chan] - pix00[chan]) +
2 * (pix21[chan] - pix01[chan]) +
(pix22[chan] - pix20[chan]);
sum2 = (pix02[chan] - pix00[chan]) +
2 * (pix12[chan] - pix10[chan]) +
(pix22[chan] - pix20[chan]);
/* common job ... */
sum = long_sqrt ((long) sum1 * sum1 + (long) sum2 * sum2);
sum = (sum * scale) >> 16; /* arbitrary scaling factor */
if (sum > maxval) sum = maxval;
dest[chan] = sum;
}
}
if (has_alpha)
dest[alpha] = src[alpha];
}
}
cur_progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) cur_progress / (double) max_progress);
}
end_tile_buf (&buf);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
/*******************************************************/
/* Dialog */
/*******************************************************/
static void
edge_ok_callback (GtkWidget *widget,
gpointer data)
{
eint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static gint
edge_dialog (GimpDrawable *drawable)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *hbox;
GtkWidget *toggle;
GtkObject *scale_data;
GSList *group = NULL;
gint use_wrap = (evals.wrapmode == WRAP);
gint use_smear = (evals.wrapmode == SMEAR);
gint use_black = (evals.wrapmode == BLACK);
gimp_ui_init ("edge", FALSE);
dlg = gimp_dialog_new (_("Edge Detection"), "edge",
gimp_standard_help_func, "filters/edge.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), edge_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);
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);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (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);
toggle = gtk_radio_button_new_with_label (group, _("Wrap"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&use_wrap);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_wrap);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, _("Smear"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&use_smear);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_smear);
gtk_widget_show (toggle);
toggle = gtk_radio_button_new_with_label (group, _("Black"));
group = gtk_radio_button_group (GTK_RADIO_BUTTON (toggle));
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, TRUE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&use_black);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), use_black);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
gtk_widget_show (table);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
if (use_wrap)
evals.wrapmode = WRAP;
else if (use_smear)
evals.wrapmode = SMEAR;
else if (use_black)
evals.wrapmode = BLACK;
return eint.run;
}
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