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PIKApp/plug-ins/common/checkerboard.c

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/*
* This is a plug-in for PIKA.
*
* 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 <libpika/pika.h>
#include <libpika/pikaui.h>
#include "libpika/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-checkerboard"
#define PLUG_IN_BINARY "checkerboard"
#define PLUG_IN_ROLE "pika-checkerboard"
typedef struct _Checkerboard Checkerboard;
typedef struct _CheckerboardClass CheckerboardClass;
struct _Checkerboard
{
PikaPlugIn parent_instance;
};
struct _CheckerboardClass
{
PikaPlugInClass 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 (PikaPlugIn *plug_in);
static PikaProcedure * checkerboard_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * checkerboard_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data);
static void do_checkerboard_pattern (GObject *config,
PikaDrawable *drawable,
PikaPreview *preview);
static void do_checkerboard_preview (GtkWidget *widget,
GObject *config);
static gint inblock (gint pos,
gint size);
static gboolean checkerboard_dialog (PikaProcedure *procedure,
GObject *config,
PikaImage *image,
PikaDrawable *drawable);
G_DEFINE_TYPE (Checkerboard, checkerboard, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (CHECKERBOARD_TYPE)
DEFINE_STD_SET_I18N
static void
checkerboard_class_init (CheckerboardClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_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 (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static PikaProcedure *
checkerboard_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
checkerboard_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure,
_("_Checkerboard (legacy)..."));
pika_procedure_add_menu_path (procedure,
"<Image>/Filters/Render/Pattern");
pika_procedure_set_documentation (procedure,
_("Create a checkerboard pattern"),
"More here later",
name);
pika_procedure_set_attribution (procedure,
"Brent Burton & the Edward Blevins",
"Brent Burton & the Edward Blevins",
"1997");
PIKA_PROC_ARG_BOOLEAN (procedure, "psychobily",
_("_Psychobilly"),
_("Render a psychobilly checkerboard"),
FALSE,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "check-size",
_("_Size"),
_("Size of the checks"),
1, PIKA_MAX_IMAGE_SIZE, 10,
G_PARAM_READWRITE);
PIKA_PROC_AUX_ARG_UNIT (procedure, "check-size-unit",
_("Check size unit of measure"),
_("Check size unit of measure"),
TRUE, TRUE, PIKA_UNIT_PIXEL,
PIKA_PARAM_READWRITE);
}
return procedure;
}
static PikaValueArray *
checkerboard_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
const PikaValueArray *args,
gpointer run_data)
{
PikaProcedureConfig *config;
PikaDrawable *drawable;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
config = pika_procedure_create_config (procedure);
pika_procedure_config_begin_run (config, NULL, run_mode, args);
switch (run_mode)
{
case PIKA_RUN_INTERACTIVE:
if (! checkerboard_dialog (procedure, G_OBJECT (config), image,
drawable))
{
pika_procedure_config_end_run (config, PIKA_PDB_CANCEL);
g_object_unref (config);
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CANCEL,
NULL);
}
break;
default:
break;
}
if (pika_drawable_is_rgb (drawable) ||
pika_drawable_is_gray (drawable))
{
do_checkerboard_pattern (G_OBJECT (config), drawable, NULL);
if (run_mode != PIKA_RUN_NONINTERACTIVE)
pika_displays_flush ();
}
else
{
pika_procedure_config_end_run (config, PIKA_PDB_EXECUTION_ERROR);
g_object_unref (config);
return pika_procedure_new_return_values (procedure,
PIKA_PDB_EXECUTION_ERROR,
NULL);
}
pika_procedure_config_end_run (config, PIKA_PDB_SUCCESS);
g_object_unref (config);
return pika_procedure_new_return_values (procedure, PIKA_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,
gint size,
gboolean mode,
gpointer data)
{
CheckerboardParam_t *param = (CheckerboardParam_t*) data;
gint val, xp, yp;
gint b;
if (mode)
{
/* Psychobilly Mode */
val = (inblock (x, size) != inblock (y, size));
}
else
{
/* Normal, regular checkerboard mode.
* Determine base factor (even or odd) of block
* this x/y position is in.
*/
xp = x / size;
yp = y / 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 (GObject *config,
PikaDrawable *drawable,
PikaPreview *preview)
{
CheckerboardParam_t param;
PikaRGB fg, bg;
const Babl *format;
gint bpp;
gboolean mode = FALSE;
gint size = 10;
if (config)
g_object_get (config,
"check-size", &size,
"psychobily", &mode,
NULL);
pika_context_get_background (&bg);
pika_context_get_foreground (&fg);
if (pika_drawable_is_gray (drawable))
{
param.bg[0] = pika_rgb_luminance_uchar (&bg);
pika_rgba_get_uchar (&bg, NULL, NULL, NULL, param.bg + 1);
param.fg[0] = pika_rgb_luminance_uchar (&fg);
pika_rgba_get_uchar (&fg, NULL, NULL, NULL, param.fg + 3);
if (pika_drawable_has_alpha (drawable))
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
else
{
pika_rgba_get_uchar (&bg,
param.bg, param.bg + 1, param.bg + 2, param.bg + 1);
pika_rgba_get_uchar (&fg,
param.fg, param.fg + 1, param.fg + 2, param.fg + 3);
if (pika_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 (size < 1)
{
/* make size 1 to prevent division by zero */
size = 1;
}
if (preview)
{
gint x1, y1;
gint width, height;
gint i;
guchar *buffer;
pika_preview_get_position (preview, &x1, &y1);
pika_preview_get_size (preview, &width, &height);
bpp = pika_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, size, mode,
&param);
}
pika_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 (! pika_drawable_mask_intersect (drawable, &x, &y, &w, &h))
return;
progress_total = w * h;
pika_progress_init (_("Checkerboard"));
buffer = pika_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, size, mode,
&param);
}
d += roi.width * bpp;
}
progress_done += roi.width * roi.height;
pika_progress_update ((gdouble) progress_done /
(gdouble) progress_total);
}
g_object_unref (buffer);
pika_progress_update (1.0);
pika_drawable_merge_shadow (drawable, TRUE);
pika_drawable_update (drawable, x, y, w, h);
}
}
static void
do_checkerboard_preview (GtkWidget *widget,
GObject *config)
{
PikaPreview *preview = PIKA_PREVIEW (widget);
PikaDrawable *drawable = g_object_get_data (config, "drawable");
do_checkerboard_pattern (config, 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 (PikaProcedure *procedure,
GObject *config,
PikaImage *image,
PikaDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *preview;
GtkWidget *toggle;
GtkWidget *size_entry;
gint size, width, height;
gdouble xres;
gdouble yres;
gboolean run;
pika_ui_init (PLUG_IN_BINARY);
dialog = pika_procedure_dialog_new (procedure,
PIKA_PROCEDURE_CONFIG (config),
_("Checkerboard"));
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
pika_window_set_transient (GTK_WINDOW (dialog));
preview = pika_drawable_preview_new_from_drawable (drawable);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
/* Get the image resolution and unit */
pika_image_get_resolution (image, &xres, &yres);
width = pika_drawable_get_width (drawable);
height = pika_drawable_get_height (drawable);
size = MIN (width, height);
size_entry =
pika_procedure_dialog_get_size_entry (PIKA_PROCEDURE_DIALOG (dialog),
"check-size", TRUE,
"check-size-unit", "%a",
PIKA_SIZE_ENTRY_UPDATE_SIZE,
xres);
gtk_widget_set_margin_bottom (size_entry, 12);
/* set the size (in pixels) that will be treated as 0% and 100% */
pika_size_entry_set_size (PIKA_SIZE_ENTRY (size_entry), 0, 0.0, size);
/* set upper and lower limits (in pixels) */
pika_size_entry_set_refval_boundaries (PIKA_SIZE_ENTRY (size_entry), 0,
1.0, size);
toggle = pika_procedure_dialog_get_widget (PIKA_PROCEDURE_DIALOG (dialog),
"psychobily",
GTK_TYPE_CHECK_BUTTON);
gtk_widget_set_margin_bottom (toggle, 12);
g_object_set_data (config, "drawable", drawable);
g_signal_connect (preview, "invalidated",
G_CALLBACK (do_checkerboard_preview),
config);
g_signal_connect_swapped (config, "notify",
G_CALLBACK (pika_preview_invalidate),
preview);
pika_procedure_dialog_fill (PIKA_PROCEDURE_DIALOG (dialog),
"check-size", "psychobily",
NULL);
gtk_widget_show (dialog);
run = pika_procedure_dialog_run (PIKA_PROCEDURE_DIALOG (dialog));
gtk_widget_destroy (dialog);
return run;
}
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