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gimp/app/posterize.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "drawable.h"
#include "gdisplay.h"
#include "image_map.h"
#include "interface.h"
#include "posterize.h"
#define TEXT_WIDTH 55
typedef struct _Posterize Posterize;
struct _Posterize
{
int x, y; /* coords for last mouse click */
};
typedef struct _PosterizeDialog PosterizeDialog;
struct _PosterizeDialog
{
GtkWidget *shell;
GtkWidget *levels_text;
GimpDrawable *drawable;
ImageMap image_map;
int levels;
gint preview;
};
/* posterize action functions */
static void posterize_button_press (Tool *, GdkEventButton *, gpointer);
static void posterize_button_release (Tool *, GdkEventButton *, gpointer);
static void posterize_motion (Tool *, GdkEventMotion *, gpointer);
static void posterize_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void posterize_control (Tool *, int, gpointer);
static PosterizeDialog * posterize_new_dialog (void);
static void posterize_preview (PosterizeDialog *);
static void posterize_ok_callback (GtkWidget *, gpointer);
static void posterize_cancel_callback (GtkWidget *, gpointer);
static void posterize_preview_update (GtkWidget *, gpointer);
static void posterize_levels_text_update (GtkWidget *, gpointer);
static gint posterize_delete_callback (GtkWidget *, GdkEvent *, gpointer);
static void *posterize_options = NULL;
static PosterizeDialog *posterize_dialog = NULL;
static void posterize (PixelRegion *, PixelRegion *, void *);
static Argument * posterize_invoker (Argument *);
/* posterize machinery */
static void
posterize (PixelRegion *srcPR,
PixelRegion *destPR,
void *user_data)
{
PosterizeDialog *pd;
unsigned char *src, *s;
unsigned char *dest, *d;
int has_alpha, alpha;
int w, h, b, i;
double interval, half_interval;
unsigned char transfer[256];
pd = (PosterizeDialog *) user_data;
/* Set the transfer array */
interval = 255.0 / (double) (pd->levels - 1);
half_interval = interval / 2.0;
for (i = 0; i < 256; i++)
transfer[i] = (unsigned char) ((int) (((double) i + half_interval) / interval) * interval);
h = srcPR->h;
src = srcPR->data;
dest = destPR->data;
has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
while (h--)
{
w = srcPR->w;
s = src;
d = dest;
while (w--)
{
for (b = 0; b < alpha; b++)
d[b] = transfer[s[b]];
if (has_alpha)
d[alpha] = s[alpha];
s += srcPR->bytes;
d += destPR->bytes;
}
src += srcPR->rowstride;
dest += destPR->rowstride;
}
}
/* by_color select action functions */
static void
posterize_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = gdisp_ptr;
tool->drawable = gimage_active_drawable (gdisp->gimage);
}
static void
posterize_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
}
static void
posterize_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
}
static void
posterize_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
}
static void
posterize_control (Tool *tool,
int action,
gpointer gdisp_ptr)
{
Posterize * post;
post = (Posterize *) tool->private;
switch (action)
{
case PAUSE :
break;
case RESUME :
break;
case HALT :
if (posterize_dialog)
{
active_tool->preserve = TRUE;
image_map_abort (posterize_dialog->image_map);
active_tool->preserve = FALSE;
posterize_dialog->image_map = NULL;
posterize_cancel_callback (NULL, (gpointer) posterize_dialog);
}
break;
}
}
Tool *
tools_new_posterize ()
{
Tool * tool;
Posterize * private;
/* The tool options */
if (!posterize_options)
posterize_options = tools_register_no_options (POSTERIZE, "Posterize Options");
/* The posterize dialog */
if (!posterize_dialog)
posterize_dialog = posterize_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (posterize_dialog->shell))
gtk_widget_show (posterize_dialog->shell);
tool = (Tool *) g_malloc (sizeof (Tool));
private = (Posterize *) g_malloc (sizeof (Posterize));
tool->type = POSTERIZE;
tool->state = INACTIVE;
tool->scroll_lock = 1; /* Disallow scrolling */
tool->auto_snap_to = TRUE;
tool->private = (void *) private;
tool->button_press_func = posterize_button_press;
tool->button_release_func = posterize_button_release;
tool->motion_func = posterize_motion;
tool->arrow_keys_func = standard_arrow_keys_func;
tool->cursor_update_func = posterize_cursor_update;
tool->control_func = posterize_control;
tool->preserve = FALSE;
tool->gdisp_ptr = NULL;
tool->drawable = NULL;
return tool;
}
void
tools_free_posterize (Tool *tool)
{
Posterize * post;
post = (Posterize *) tool->private;
/* Close the color select dialog */
if (posterize_dialog)
posterize_cancel_callback (NULL, (gpointer) posterize_dialog);
g_free (post);
}
void
posterize_initialize (void *gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
message_box ("Posterize does not operate on indexed drawables.", NULL, NULL);
return;
}
/* The posterize dialog */
if (!posterize_dialog)
posterize_dialog = posterize_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (posterize_dialog->shell))
gtk_widget_show (posterize_dialog->shell);
posterize_dialog->drawable = gimage_active_drawable (gdisp->gimage);
posterize_dialog->image_map = image_map_create (gdisp_ptr, posterize_dialog->drawable);
if (posterize_dialog->preview)
posterize_preview (posterize_dialog);
}
/****************************/
/* Select by Color dialog */
/****************************/
/* the action area structure */
static ActionAreaItem action_items[] =
{
{ "OK", posterize_ok_callback, NULL, NULL },
{ "Cancel", posterize_cancel_callback, NULL, NULL }
};
static PosterizeDialog *
posterize_new_dialog ()
{
PosterizeDialog *pd;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *toggle;
pd = g_malloc (sizeof (PosterizeDialog));
pd->preview = TRUE;
pd->levels = 3;
/* The shell and main vbox */
pd->shell = gtk_dialog_new ();
gtk_window_set_wmclass (GTK_WINDOW (pd->shell), "posterize", "Gimp");
gtk_window_set_title (GTK_WINDOW (pd->shell), "Posterize");
gtk_signal_connect (GTK_OBJECT (pd->shell), "delete_event",
GTK_SIGNAL_FUNC (posterize_delete_callback),
pd);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_border_width (GTK_CONTAINER (vbox), 2);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (pd->shell)->vbox), vbox, TRUE, TRUE, 0);
/* Horizontal box for levels text widget */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new ("Posterize Levels: ");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
gtk_widget_show (label);
/* levels text */
pd->levels_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (pd->levels_text), "3");
gtk_widget_set_usize (pd->levels_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), pd->levels_text, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (pd->levels_text), "changed",
(GtkSignalFunc) posterize_levels_text_update,
pd);
gtk_widget_show (pd->levels_text);
gtk_widget_show (hbox);
/* Horizontal box for preview */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
/* The preview toggle */
toggle = gtk_check_button_new_with_label ("Preview");
gtk_toggle_button_set_state (GTK_TOGGLE_BUTTON (toggle), pd->preview);
gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) posterize_preview_update,
pd);
gtk_widget_show (label);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
/* The action area */
action_items[0].user_data = pd;
action_items[1].user_data = pd;
build_action_area (GTK_DIALOG (pd->shell), action_items, 2, 0);
gtk_widget_show (vbox);
gtk_widget_show (pd->shell);
return pd;
}
static void
posterize_preview (PosterizeDialog *pd)
{
if (!pd->image_map)
g_warning ("No image map");
active_tool->preserve = TRUE;
image_map_apply (pd->image_map, posterize, (void *) pd);
active_tool->preserve = FALSE;
}
static void
posterize_ok_callback (GtkWidget *widget,
gpointer client_data)
{
PosterizeDialog *pd;
pd = (PosterizeDialog *) client_data;
if (GTK_WIDGET_VISIBLE (pd->shell))
gtk_widget_hide (pd->shell);
active_tool->preserve = TRUE;
if (!pd->preview)
image_map_apply (pd->image_map, posterize, (void *) pd);
if (pd->image_map)
image_map_commit (pd->image_map);
active_tool->preserve = FALSE;
pd->image_map = NULL;
}
static gint
posterize_delete_callback (GtkWidget *w, GdkEvent *e, gpointer data)
{
posterize_cancel_callback (w, data);
return TRUE;
}
static void
posterize_cancel_callback (GtkWidget *widget,
gpointer client_data)
{
PosterizeDialog *pd;
pd = (PosterizeDialog *) client_data;
if (GTK_WIDGET_VISIBLE (pd->shell))
gtk_widget_hide (pd->shell);
if (pd->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (pd->image_map);
active_tool->preserve = FALSE;
gdisplays_flush ();
}
pd->image_map = NULL;
}
static void
posterize_preview_update (GtkWidget *w,
gpointer data)
{
PosterizeDialog *pd;
pd = (PosterizeDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
pd->preview = TRUE;
posterize_preview (pd);
}
else
pd->preview = FALSE;
}
static void
posterize_levels_text_update (GtkWidget *w,
gpointer data)
{
PosterizeDialog *pd;
char *str;
int value;
pd = (PosterizeDialog *) data;
str = gtk_entry_get_text (GTK_ENTRY (w));
value = BOUNDS (((int) atof (str)), 2, 256);
if (value != pd->levels)
{
pd->levels = value;
if (pd->preview)
posterize_preview (pd);
}
}
/* The posterize procedure definition */
ProcArg posterize_args[] =
{
{ PDB_IMAGE,
"image",
"the image"
},
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_INT32,
"levels",
"levels of posterization: (2 <= levels <= 255)"
}
};
ProcRecord posterize_proc =
{
"gimp_posterize",
"Posterize the specified drawable",
"This procedures reduces the number of shades allows in each intensity channel to the specified 'levels' parameter.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1997",
PDB_INTERNAL,
/* Input arguments */
3,
posterize_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { posterize_invoker } },
};
static Argument *
posterize_invoker (Argument *args)
{
PixelRegion srcPR, destPR;
int success = TRUE;
PosterizeDialog pd;
GImage *gimage;
GimpDrawable *drawable;
int levels;
int int_value;
int x1, y1, x2, y2;
void *pr;
drawable = NULL;
levels = 0;
/* the gimage */
if (success)
{
int_value = args[0].value.pdb_int;
if (! (gimage = gimage_get_ID (int_value)))
success = FALSE;
}
/* the drawable */
if (success)
{
int_value = args[1].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL || gimage != drawable_gimage (drawable))
success = FALSE;
}
/* make sure the drawable is not indexed color */
if (success)
success = ! drawable_indexed (drawable);
/* levels */
if (success)
{
int_value = args[2].value.pdb_int;
if (int_value >= 2 && int_value < 256)
levels = int_value;
else
success = FALSE;
}
/* arrange to modify the levels */
if (success)
{
pd.levels = levels;
/* The application should occur only within selection bounds */
drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
pixel_region_init (&srcPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
pixel_region_init (&destPR, drawable_shadow (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
posterize (&srcPR, &destPR, (void *) &pd);
drawable_merge_shadow (drawable, TRUE);
drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
}
return procedural_db_return_args (&posterize_proc, success);
}
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