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gimp/plug-ins/common/checkerboard.c

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/*
* This is a plug-in for the GIMP.
*
* Copyright (C) 1997 Brent Burton & the Edward Blevins
*
* 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"
/* Variables set in dialog box */
typedef struct data
{
gint mode;
gint size;
} CheckVals;
typedef struct
{
gint run;
} CheckInterface;
static CheckInterface cint =
{
FALSE
};
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void check (GimpDrawable *drawable);
static gint inblock (gint pos,
gint size);
static gint check_dialog (void);
static void check_ok_callback (GtkWidget *widget,
gpointer data);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static CheckVals cvals =
{
0,
10
};
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_INT32, "check_mode", "Regular or Physcobilly" },
{ GIMP_PDB_INT32, "check_size", "Size of the checks" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
gimp_install_procedure ("plug_in_checkerboard",
"Adds a checkerboard pattern to an image",
"More here later",
"Brent Burton & the Edward Blevins",
"Brent Burton & the Edward Blevins",
"1997",
N_("<Image>/Filters/Render/Pattern/Checkerboard..."),
"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;
INIT_I18N_UI();
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;
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data ("plug_in_checkerboard", &cvals);
if (! check_dialog())
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 5)
status = GIMP_PDB_CALLING_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
cvals.mode = param[3].data.d_int32;
cvals.size = param[4].data.d_int32;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data ("plug_in_checkerboard", &cvals);
break;
default:
break;
}
if (gimp_drawable_is_rgb (drawable->id) ||
gimp_drawable_is_gray (drawable->id))
{
gimp_progress_init (_("Adding Checkerboard..."));
check (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_checkerboard", &cvals, sizeof (CheckVals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
check (GimpDrawable *drawable)
{
GimpPixelRgn dest_rgn;
guchar *dest_row;
guchar *dest;
gint row, col;
gint progress, max_progress;
gint x1, y1, x2, y2, x, y;
guchar fg[4],bg[4];
gint bp;
gpointer pr;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
progress = 0;
max_progress = (x2 - x1) * (y2 - y1);
/* Get the foreground and background colors */
switch ( gimp_drawable_type (drawable->id) )
{
case GIMP_RGBA_IMAGE:
fg[3] = 255;
bg[3] = 255;
case GIMP_RGB_IMAGE:
gimp_palette_get_foreground (&fg[0], &fg[1], &fg[2]);
gimp_palette_get_background (&bg[0], &bg[1], &bg[2]);
break;
case GIMP_GRAYA_IMAGE:
fg[1] = 255;
bg[1] = 255;
case GIMP_GRAY_IMAGE:
fg[0] = 255;
bg[0] = 0;
break;
default:
break;
}
for (pr = gimp_pixel_rgns_register (1, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
y = dest_rgn.y;
dest_row = dest_rgn.data;
for ( row = 0; row < dest_rgn.h; row++)
{
dest = dest_row;
x = dest_rgn.x;
for (col = 0; col < dest_rgn.w; col++)
{
gint val, xp, yp;
if (cvals.mode)
{
/* Psychobilly Mode */
val =
(inblock (x, cvals.size) == inblock (y, cvals.size)) ? 0 : 1;
}
else
{
/* Normal, regular checkerboard mode.
* Determine base factor (even or odd) of block
* this x/y position is in.
*/
xp = x/cvals.size;
yp = y/cvals.size;
/* if both even or odd, color sqr */
val = ( (xp&1) == (yp&1) ) ? 0 : 1;
}
for (bp = 0; bp < dest_rgn.bpp; bp++)
dest[bp] = val ? fg[bp] : bg[bp];
dest += dest_rgn.bpp;
x++;
}
dest_row += dest_rgn.rowstride;
y++;
}
progress += dest_rgn.w * dest_rgn.h;
gimp_progress_update ((double) progress / (double) max_progress);
}
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
static gint
inblock (gint pos,
gint size)
{
static gint *in = NULL; /* initialized first time */
gint i,j,k, len;
/* avoid a FP exception */
if (size == 1)
size = 2;
len = size*size;
/*
* Initialize the array; since we'll be called thousands of
* times with the same size value, precompute the array.
*/
if (in == NULL)
{
in = g_new (gint, len);
if (in == NULL)
{
return 0;
}
else
{
int cell = 1; /* cell value */
/*
* i is absolute index into in[]
* j is current number of blocks to fill in with a 1 or 0.
* k is just counter for the j cells.
*/
i=0;
for (j=1; j<=size; j++ )
{ /* first half */
for (k=0; k<j; k++ )
{
in[i++] = cell;
}
cell = !cell;
}
for ( j=size-1; j>=1; j--)
{ /* second half */
for (k=0; k<j; k++ )
{
in[i++] = cell;
}
cell = !cell;
}
}
}
/* place pos within 0..(len-1) grid and return the value. */
return in[ pos % (len-1) ];
}
static gint
check_dialog (void)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *toggle;
GtkWidget *table;
GtkObject *size_data;
gimp_ui_init ("checkerboard", FALSE);
dlg = gimp_dialog_new (_("Checkerboard"), "checkerboard",
gimp_standard_help_func, "filters/checkerboard.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), check_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, 4);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
gtk_container_add (GTK_CONTAINER (frame), vbox);
toggle = gtk_check_button_new_with_label (_("Psychobilly"));
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),
&cvals.mode);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cvals.mode);
gtk_widget_show (toggle);
table = gtk_table_new (1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
size_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Check Size:"), 200, 0,
cvals.size, 1, 400, 1, 10, 0,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (size_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_int_adjustment_update),
&cvals.size);
gtk_widget_show (vbox);
gtk_widget_show (frame);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return cint.run;
}
static void
check_ok_callback (GtkWidget *widget,
gpointer data)
{
cint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
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