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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 3 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, see <https://www.gnu.org/licenses/>.
*
*/
#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 PLUG_IN_ROLE "gimp-checkerboard"
#define SPIN_BUTTON_WIDTH 8
/* Variables set in dialog box */
typedef struct data
{
gboolean mode;
gint size;
} CheckVals;
typedef struct _Checkerboard Checkerboard;
typedef struct _CheckerboardClass CheckerboardClass;
struct _Checkerboard
{
GimpPlugIn parent_instance;
};
struct _CheckerboardClass
{
GimpPlugInClass parent_class;
};
#define CHECKERBOARD_TYPE (checkerboard_get_type ())
#define CHECKERBOARD (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CHECKERBOARD_TYPE, Checkerboard))
GType checkerboard_get_type (void) G_GNUC_CONST;
static GList * checkerboard_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * checkerboard_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * checkerboard_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data);
static void do_checkerboard_pattern (GimpDrawable *drawable,
GimpPreview *preview);
static void do_checkerboard_preview (GimpDrawable *drawable,
GimpPreview *preview);
static gint inblock (gint pos,
gint size);
static gboolean checkerboard_dialog (GimpImage *image,
GimpDrawable *drawable);
static void check_size_update_callback (GtkWidget *widget);
G_DEFINE_TYPE (Checkerboard, checkerboard, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (CHECKERBOARD_TYPE)
DEFINE_STD_SET_I18N
static CheckVals cvals =
{
FALSE, /* mode */
10 /* size */
};
static void
checkerboard_class_init (CheckerboardClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = checkerboard_query_procedures;
plug_in_class->create_procedure = checkerboard_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
checkerboard_init (Checkerboard *checkerboard)
{
}
static GList *
checkerboard_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
checkerboard_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
checkerboard_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "RGB*, GRAY*");
gimp_procedure_set_sensitivity_mask (procedure,
GIMP_PROCEDURE_SENSITIVE_DRAWABLE);
gimp_procedure_set_menu_label (procedure,
N_("_Checkerboard (legacy)..."));
gimp_procedure_add_menu_path (procedure,
"<Image>/Filters/Render/Pattern");
gimp_procedure_set_documentation (procedure,
N_("Create a checkerboard pattern"),
"More here later",
name);
gimp_procedure_set_attribution (procedure,
"Brent Burton & the Edward Blevins",
"Brent Burton & the Edward Blevins",
"1997");
GIMP_PROC_ARG_BOOLEAN (procedure, "psychobily",
"Psychobily",
"Render a psychobiliy checkerboard",
FALSE,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "check-size",
"Check size",
"Size of the checks",
1, GIMP_MAX_IMAGE_SIZE, 10,
G_PARAM_READWRITE);
}
return procedure;
}
static GimpValueArray *
checkerboard_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data)
{
GimpDrawable *drawable;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &cvals);
if (! checkerboard_dialog (image, drawable))
{
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CANCEL,
NULL);
}
break;
case GIMP_RUN_NONINTERACTIVE:
cvals.mode = GIMP_VALUES_GET_BOOLEAN (args, 0);
cvals.size = GIMP_VALUES_GET_INT (args, 1);
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &cvals);
break;
default:
break;
}
if (gimp_drawable_is_rgb (drawable) ||
gimp_drawable_is_gray (drawable))
{
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
{
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_EXECUTION_ERROR,
NULL);
}
return gimp_procedure_new_return_values (procedure, GIMP_PDB_SUCCESS, NULL);
}
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;
GimpRGB fg, bg;
const Babl *format;
gint bpp;
gimp_context_get_background (&bg);
gimp_context_get_foreground (&fg);
if (gimp_drawable_is_gray (drawable))
{
param.bg[0] = gimp_rgb_luminance_uchar (&bg);
gimp_rgba_get_uchar (&bg, NULL, NULL, NULL, param.bg + 1);
param.fg[0] = gimp_rgb_luminance_uchar (&fg);
gimp_rgba_get_uchar (&fg, NULL, NULL, NULL, param.fg + 3);
if (gimp_drawable_has_alpha (drawable))
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
else
{
gimp_rgba_get_uchar (&bg,
param.bg, param.bg + 1, param.bg + 2, param.bg + 1);
gimp_rgba_get_uchar (&fg,
param.fg, param.fg + 1, param.fg + 2, param.fg + 3);
if (gimp_drawable_has_alpha (drawable))
format = babl_format ("Y'A u8");
else
format = babl_format ("Y' u8");
}
bpp = babl_format_get_bytes_per_pixel (format);
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;
guchar *buffer;
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
bpp = gimp_drawable_get_bpp (drawable);
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
{
GeglBuffer *buffer;
GeglBufferIterator *iter;
gint x, y, w, h;
gint progress_total;
gint progress_done = 0;
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &w, &h))
return;
progress_total = w * h;
gimp_progress_init (_("Checkerboard"));
buffer = gimp_drawable_get_shadow_buffer (drawable);
iter = gegl_buffer_iterator_new (buffer,
GEGL_RECTANGLE (x, y, w, h), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[0].roi;
guchar *dest = iter->items[0].data;
guchar *d;
gint y1, x1;
d = dest;
for (y1 = 0; y1 < roi.height; y1++)
{
for (x1 = 0; x1 < roi.width; x1++)
{
checkerboard_func (roi.x + x1,
roi.y + y1,
d + x1 * bpp,
bpp, &param);
}
d += roi.width * bpp;
}
progress_done += roi.width * roi.height;
gimp_progress_update ((gdouble) progress_done /
(gdouble) progress_total);
}
g_object_unref (buffer);
gimp_progress_update (1.0);
gimp_drawable_merge_shadow (drawable, TRUE);
gimp_drawable_update (drawable, x, y, w, h);
}
}
static void
do_checkerboard_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
do_checkerboard_pattern (drawable, preview);
}
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 (GimpImage *image,
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);
dialog = gimp_dialog_new (_("Checkerboard"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
preview = gimp_drawable_preview_new_from_drawable (drawable);
gtk_box_pack_start (GTK_BOX (vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (do_checkerboard_preview),
drawable);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 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, &xres, &yres);
unit = gimp_image_get_unit (image);
width = gimp_drawable_get_width (drawable);
height = gimp_drawable_get_height (drawable);
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_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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