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gimp/plug-ins/common/checkerboard.c

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/*
* This is a plug-in for 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-checkerboard"
#define PLUG_IN_BINARY "checkerboard"
#define SPIN_BUTTON_WIDTH 8
/* Variables set in dialog box */
typedef struct data
{
gboolean mode;
gint size;
} CheckVals;
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void do_checkerboard_pattern (GimpDrawable *drawable,
GimpPreview *preview);
static gint inblock (gint pos,
gint size);
static gboolean checkerboard_dialog (gint32 image_ID,
GimpDrawable *drawable);
static void check_size_update_callback (GtkWidget *widget);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static CheckVals cvals =
{
FALSE, /* mode */
10 /* size */
};
MAIN ()
static void
query (void)
{
static const 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 Psychobilly" },
{ GIMP_PDB_INT32, "check-size", "Size of the checks" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Create a checkerboard pattern"),
"More here later",
"Brent Burton & the Edward Blevins",
"Brent Burton & the Edward Blevins",
"1997",
N_("_Checkerboard..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Render/Pattern");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
gint32 image_ID;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
INIT_I18N ();
run_mode = param[0].data.d_int32;
image_ID = param[1].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_PROC, &cvals);
if (! checkerboard_dialog (image_ID, drawable))
{
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_PROC, &cvals);
break;
default:
break;
}
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Adding checkerboard"));
do_checkerboard_pattern (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &cvals, sizeof (CheckVals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
typedef struct
{
guchar fg[4];
guchar bg[4];
} CheckerboardParam_t;
static void
checkerboard_func (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
CheckerboardParam_t *param = (CheckerboardParam_t*) data;
gint val, xp, yp;
gint b;
if (cvals.mode)
{
/* Psychobilly Mode */
val = (inblock (x, cvals.size) != inblock (y, cvals.size));
}
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) );
}
for (b = 0; b < bpp; b++)
dest[b] = val ? param->fg[b] : param->bg[b];
}
static void
do_checkerboard_pattern (GimpDrawable *drawable,
GimpPreview *preview)
{
CheckerboardParam_t param;
GimpRgnIterator *iter;
GimpRGB color;
gimp_context_get_background (&color);
gimp_drawable_get_color_uchar (drawable->drawable_id, &color, param.bg);
gimp_context_get_foreground (&color);
gimp_drawable_get_color_uchar (drawable->drawable_id, &color, param.fg);
if (cvals.size < 1)
{
/* make size 1 to prevent division by zero */
cvals.size = 1;
}
if (preview)
{
gint x1, y1;
gint width, height;
gint i;
gint bpp;
guchar *buffer;
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
bpp = drawable->bpp;
buffer = g_new (guchar, width * height * bpp);
for (i = 0; i < width * height; i++)
{
checkerboard_func (x1 + i % width,
y1 + i / width,
buffer + i * bpp,
bpp, &param);
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
}
else
{
iter = gimp_rgn_iterator_new (drawable, 0);
gimp_rgn_iterator_dest (iter, checkerboard_func, &param);
gimp_rgn_iterator_free (iter);
}
}
static gint
inblock (gint pos,
gint size)
{
static gint *in = NULL; /* initialized first time */
static gint len = -1;
/* avoid a FP exception */
if (size == 1)
size = 2;
if (in && len != size * size)
{
g_free (in);
in = NULL;
}
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)
{
gint cell = 1; /* cell value */
gint i, j, k;
in = g_new (gint, len);
/*
* 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 gboolean
checkerboard_dialog (gint32 image_ID,
GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *preview;
GtkWidget *toggle;
GtkWidget *size_entry;
gint size, width, height;
GimpUnit unit;
gdouble xres;
gdouble yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Checkerboard"), 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));
vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), vbox);
gtk_widget_show (vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_container_add (GTK_CONTAINER (vbox), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (do_checkerboard_pattern),
drawable);
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* Get the image resolution and unit */
gimp_image_get_resolution (image_ID, &xres, &yres);
unit = gimp_image_get_unit (image_ID);
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
size = MIN (width, height);
size_entry = gimp_size_entry_new (1, unit, "%a",
TRUE, TRUE, FALSE, SPIN_BUTTON_WIDTH,
GIMP_SIZE_ENTRY_UPDATE_SIZE);
gtk_table_set_col_spacing (GTK_TABLE (size_entry), 0, 4);
gtk_table_set_col_spacing (GTK_TABLE (size_entry), 1, 4);
gtk_box_pack_start (GTK_BOX (hbox), size_entry, FALSE, FALSE, 0);
gtk_widget_show (size_entry);
/* set the unit back to pixels, since most times we will want pixels */
gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (size_entry), GIMP_UNIT_PIXEL);
/* set the resolution to the image resolution */
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (size_entry), 0, xres, TRUE);
/* set the size (in pixels) that will be treated as 0% and 100% */
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (size_entry), 0, 0.0, size);
/* set upper and lower limits (in pixels) */
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (size_entry), 0,
1.0, size);
/* initialize the values */
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (size_entry), 0, cvals.size);
/* attach labels */
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (size_entry),
_("_Size:"), 1, 0, 0.0);
g_signal_connect (size_entry, "value-changed",
G_CALLBACK (check_size_update_callback),
&cvals.size);
g_signal_connect_swapped (size_entry, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("_Psychobilly"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cvals.mode);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&cvals.mode);
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);
return run;
}
static void
check_size_update_callback (GtkWidget *widget)
{
cvals.size = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (widget), 0);
}
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