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gimp/app/tools/airbrush.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 "appenv.h"
#include "gimpbrushlist.h"
#include "drawable.h"
#include "errors.h"
#include "gdisplay.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "palette.h"
#include "airbrush.h"
#include "selection.h"
#include "tools.h"
#include "gimage.h"
#include "libgimp/gimpintl.h"
typedef struct _AirbrushTimeout AirbrushTimeout;
struct _AirbrushTimeout
{
PaintCore *paint_core;
GimpDrawable *drawable;
};
/* forward function declarations */
static void airbrush_motion (PaintCore *, GimpDrawable *, double);
static gint airbrush_time_out (gpointer);
static Argument * airbrush_invoker (Argument *);
static double non_gui_pressure;
/* The maximum amount of pressure that can be exerted */
#define MAX_PRESSURE 0.075
#define OFF 0
#define ON 1
typedef struct _AirbrushOptions AirbrushOptions;
struct _AirbrushOptions
{
double rate;
double pressure;
};
/* local variables */
static gint timer; /* timer for successive paint applications */
static int timer_state = OFF; /* state of airbrush tool */
static AirbrushTimeout airbrush_timeout;
static AirbrushOptions *airbrush_options = NULL;
static void
airbrush_scale_update (GtkAdjustment *adjustment,
double *scale_val)
{
*scale_val = adjustment->value;
}
static AirbrushOptions *
create_airbrush_options (void)
{
AirbrushOptions *options;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *rate_scale;
GtkWidget *pressure_scale;
GtkObject *rate_scale_data;
GtkObject *pressure_scale_data;
/* the new options structure */
options = (AirbrushOptions *) g_malloc (sizeof (AirbrushOptions));
options->rate = 80.0;
options->pressure = 10.0;
/* the main vbox */
vbox = gtk_vbox_new (FALSE, 1);
/* the main label */
label = gtk_label_new (_("Airbrush Options"));
gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
/* the rate scale */
hbox = gtk_hbox_new (FALSE, 1);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
label = gtk_label_new (_("Rate: "));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
rate_scale_data = gtk_adjustment_new (80.0, 0.0, 150.0, 1.0, 1.0, 0.0);
rate_scale = gtk_hscale_new (GTK_ADJUSTMENT (rate_scale_data));
gtk_box_pack_start (GTK_BOX (hbox), rate_scale, TRUE, TRUE, 0);
gtk_scale_set_value_pos (GTK_SCALE (rate_scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (rate_scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (rate_scale_data), "value_changed",
(GtkSignalFunc) airbrush_scale_update, &options->rate);
gtk_widget_show (rate_scale);
/* the pressure scale */
hbox = gtk_hbox_new (FALSE, 1);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
label = gtk_label_new (_("Pressure: "));
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
pressure_scale_data = gtk_adjustment_new (10.0, 0.0, 100.0, 1.0, 1.0, 0.0);
pressure_scale = gtk_hscale_new (GTK_ADJUSTMENT (pressure_scale_data));
gtk_box_pack_start (GTK_BOX (hbox), pressure_scale, TRUE, TRUE, 0);
gtk_scale_set_value_pos (GTK_SCALE (pressure_scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (pressure_scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (pressure_scale_data), "value_changed",
(GtkSignalFunc) airbrush_scale_update, &options->pressure);
gtk_widget_show (pressure_scale);
/* Register this selection options widget with the main tools options dialog */
tools_register_options (AIRBRUSH, vbox);
return options;
}
void *
airbrush_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
GimpBrushP brush;
if (!drawable)
return NULL;
brush = get_active_brush ();
switch (state)
{
case INIT_PAINT :
/* timer_state = OFF; */
if (timer_state == ON)
{
g_warning (_("killing stray timer, please report to lewing@gimp.org"));
gtk_timeout_remove (timer);
}
timer_state = OFF;
break;
case MOTION_PAINT :
if (timer_state == ON)
gtk_timeout_remove (timer);
timer_state = OFF;
airbrush_motion (paint_core, drawable, airbrush_options->pressure);
if (airbrush_options->rate != 0.0)
{
airbrush_timeout.paint_core = paint_core;
airbrush_timeout.drawable = drawable;
timer = gtk_timeout_add ((10000 / airbrush_options->rate),
airbrush_time_out, NULL);
timer_state = ON;
}
break;
case FINISH_PAINT :
if (timer_state == ON)
gtk_timeout_remove (timer);
timer_state = OFF;
break;
default :
break;
}
return NULL;
}
Tool *
tools_new_airbrush ()
{
Tool * tool;
PaintCore * private;
if (! airbrush_options)
airbrush_options = create_airbrush_options ();
tool = paint_core_new (AIRBRUSH);
private = (PaintCore *) tool->private;
private->paint_func = airbrush_paint_func;
return tool;
}
void
tools_free_airbrush (Tool *tool)
{
if (timer_state == ON)
gtk_timeout_remove (timer);
timer_state = OFF;
paint_core_free (tool);
}
static gint
airbrush_time_out (gpointer client_data)
{
/* service the timer */
airbrush_motion (airbrush_timeout.paint_core,
airbrush_timeout.drawable,
airbrush_options->pressure);
gdisplays_flush ();
/* restart the timer */
if (airbrush_options->rate != 0.0)
return TRUE;
else
return FALSE;
}
static void
airbrush_motion (PaintCore *paint_core,
GimpDrawable *drawable,
double pressure)
{
gint opacity;
GImage *gimage;
TempBuf * area;
unsigned char col[MAX_CHANNELS];
if (!drawable)
return;
if (! (gimage = drawable_gimage (drawable)))
return;
gimage_get_foreground (gimage, drawable, col);
if (! (area = paint_core_get_paint_area (paint_core, drawable)))
return;
/* color the pixels */
col[area->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
opacity = pressure * (paint_core->curpressure / 0.5);
if (opacity > 255)
opacity = 255;
/* paste the newly painted area to the image */
paint_core_paste_canvas (paint_core, drawable,
opacity,
(int) (gimp_brush_get_opacity () * 255),
gimp_brush_get_paint_mode (),
SOFT, CONSTANT);
}
static void *
airbrush_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
airbrush_motion (paint_core, drawable, non_gui_pressure);
return NULL;
}
/* The airbrush procedure definition */
ProcArg airbrush_args[] =
{
{ PDB_DRAWABLE,
"drawable",
"the drawable"
},
{ PDB_FLOAT,
"pressure",
"The pressure of the airbrush strokes: 0 <= pressure <= 100"
},
{ PDB_INT32,
"num_strokes",
"number of stroke control points (count each coordinate as 2 points)"
},
{ PDB_FLOATARRAY,
"strokes",
"array of stroke coordinates: {s1.x, s1.y, s2.x, s2.y, ..., sn.x, sn.y}"
}
};
ProcRecord airbrush_proc =
{
"gimp_airbrush",
"Paint in the current brush with varying pressure. Paint application is time-dependent",
"This tool simulates the use of an airbrush. Paint pressure represents the relative intensity of the paint application. High pressure results in a thicker layer of paint while low pressure results in a thinner layer.",
"Spencer Kimball & Peter Mattis",
"Spencer Kimball & Peter Mattis",
"1995-1996",
PDB_INTERNAL,
/* Input arguments */
4,
airbrush_args,
/* Output arguments */
0,
NULL,
/* Exec method */
{ { airbrush_invoker } },
};
static Argument *
airbrush_invoker (Argument *args)
{
int success = TRUE;
GImage *gimage;
GimpDrawable *drawable;
int num_strokes;
double *stroke_array;
int int_value;
double fp_value;
int i;
drawable = NULL;
num_strokes = 0;
/* the drawable */
if (success)
{
int_value = args[0].value.pdb_int;
drawable = drawable_get_ID (int_value);
if (drawable == NULL)
success = FALSE;
else
gimage = drawable_gimage (drawable);
}
/* pressure */
if (success)
{
fp_value = args[1].value.pdb_float;
if (fp_value >= 0.0 && fp_value <= 100.0)
non_gui_pressure = fp_value;
else
success = FALSE;
}
/* num strokes */
if (success)
{
int_value = args[2].value.pdb_int;
if (int_value > 0)
num_strokes = int_value / 2;
else
success = FALSE;
}
/* point array */
if (success)
stroke_array = (double *) args[3].value.pdb_pointer;
if (success)
/* init the paint core */
success = paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]);
if (success)
{
/* set the paint core's paint func */
non_gui_paint_core.paint_func = airbrush_non_gui_paint_func;
non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
if (num_strokes == 1)
airbrush_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
for (i = 1; i < num_strokes; i++)
{
non_gui_paint_core.curx = stroke_array[i * 2 + 0];
non_gui_paint_core.cury = stroke_array[i * 2 + 1];
paint_core_interpolate (&non_gui_paint_core, drawable);
non_gui_paint_core.lastx = non_gui_paint_core.curx;
non_gui_paint_core.lasty = non_gui_paint_core.cury;
}
/* finish the painting */
paint_core_finish (&non_gui_paint_core, drawable, -1);
/* cleanup */
paint_core_cleanup ();
}
return procedural_db_return_args (&airbrush_proc, success);
}
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