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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 "paint_options.h"
#include "palette.h"
#include "airbrush.h"
#include "selection.h"
#include "tool_options_ui.h"
#include "tools.h"
#include "gimage.h"
#include "libgimp/gimpintl.h"
/* The maximum amount of pressure that can be exerted */
#define MAX_PRESSURE 0.075
#define OFF 0
#define ON 1
/* the airbrush structures */
typedef struct _AirbrushTimeout AirbrushTimeout;
struct _AirbrushTimeout
{
PaintCore *paint_core;
GimpDrawable *drawable;
};
typedef struct _AirbrushOptions AirbrushOptions;
struct _AirbrushOptions
{
PaintOptions paint_options;
double rate;
double rate_d;
GtkObject *rate_w;
double pressure;
double pressure_d;
GtkObject *pressure_w;
};
/* the airbrush tool options */
static AirbrushOptions *airbrush_options = NULL;
/* local variables */
static gint timer; /* timer for successive paint applications */
static int timer_state = OFF; /* state of airbrush tool */
static AirbrushTimeout airbrush_timeout;
static double non_gui_pressure;
/* forward function declarations */
static void airbrush_motion (PaintCore *, GimpDrawable *, double);
static gint airbrush_time_out (gpointer);
/* functions */
static void
airbrush_options_reset (void)
{
AirbrushOptions *options = airbrush_options;
paint_options_reset ((PaintOptions *) options);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->rate_w),
options->rate_d);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->pressure_w),
options->pressure_d);
}
static AirbrushOptions *
airbrush_options_new (void)
{
AirbrushOptions *options;
GtkWidget *vbox;
GtkWidget *table;
GtkWidget *label;
GtkWidget *scale;
/* the new airbrush tool options structure */
options = (AirbrushOptions *) g_malloc (sizeof (AirbrushOptions));
paint_options_init ((PaintOptions *) options,
AIRBRUSH,
airbrush_options_reset);
options->rate = options->rate_d = 80.0;
options->pressure = options->pressure_d = 10.0;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the rate scale */
table = gtk_table_new (2, 2, FALSE);
gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 1);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
label = gtk_label_new (_("Rate:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
options->rate_w =
gtk_adjustment_new (options->rate_d, 0.0, 150.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->rate_w));
gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, 0, 1);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (options->rate_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->rate);
gtk_widget_show (scale);
/* the pressure scale */
label = gtk_label_new (_("Pressure:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
options->pressure_w =
gtk_adjustment_new (options->pressure_d, 0.0, 100.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->pressure_w));
gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, 1, 2);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (options->pressure_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->pressure);
gtk_widget_show (scale);
gtk_widget_show (table);
return options;
}
Tool *
tools_new_airbrush ()
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! airbrush_options)
{
airbrush_options = airbrush_options_new ();
tools_register (AIRBRUSH, (ToolOptions *) airbrush_options);
}
tool = paint_core_new (AIRBRUSH);
private = (PaintCore *) tool->private;
private->paint_func = airbrush_paint_func;
private->pick_colors = TRUE;
return tool;
}
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;
}
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) (PAINT_OPTIONS_GET_OPACITY (airbrush_options) * 255),
PAINT_OPTIONS_GET_PAINT_MODE (airbrush_options),
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;
}
gboolean
airbrush_non_gui (GimpDrawable *drawable,
double pressure,
int num_strokes,
double *stroke_array)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
/* 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 TRUE;
}
else
return FALSE;
}
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