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gimp/app/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 "airbrush.h"
#include "drawable.h"
#include "errors.h"
#include "gdisplay.h"
#include "gimpbrushpipe.h"
#include "gradient.h"
#include "gimage.h"
#include "gimpui.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "paint_options.h"
#include "selection.h"
#include "tools.h"
#include "libgimp/gimpintl.h"
/* The maximum amount of pressure that can be exerted */
#define MAX_PRESSURE 0.075
/* Default pressure setting */
#define AIRBRUSH_PRESSURE_DEFAULT 10.0
#define AIRBRUSH_INCREMENTAL_DEFAULT FALSE
#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;
gdouble rate;
gdouble rate_d;
GtkObject *rate_w;
gdouble pressure;
gdouble 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 gint timer_state = OFF; /* state of airbrush tool */
static AirbrushTimeout airbrush_timeout;
static gdouble non_gui_pressure;
static gboolean non_gui_incremental;
/* forward function declarations */
static void airbrush_motion (PaintCore *, GimpDrawable *,
PaintPressureOptions *,
gdouble, PaintApplicationMode);
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 *scale;
/* the new airbrush tool options structure */
options = g_new (AirbrushOptions, 1);
paint_options_init ((PaintOptions *) options,
AIRBRUSH,
airbrush_options_reset);
options->rate = options->rate_d = 80.0;
options->pressure = options->pressure_d = AIRBRUSH_PRESSURE_DEFAULT;
/* 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);
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_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",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&options->rate);
gimp_table_attach_aligned (GTK_TABLE (table), 0,
_("Rate:"), 1.0, 1.0,
scale, FALSE);
/* the pressure scale */
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_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",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&options->pressure);
gimp_table_attach_aligned (GTK_TABLE (table), 1,
_("Pressure:"), 1.0, 1.0,
scale, FALSE);
gtk_widget_show (table);
return options;
}
Tool *
tools_new_airbrush (void)
{
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;
private->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
return tool;
}
void *
airbrush_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
GimpBrush *brush;
gdouble rate;
if (!drawable)
return NULL;
brush = gimp_context_get_brush (NULL);
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->paint_options.pressure_options,
airbrush_options->pressure,
airbrush_options->paint_options.incremental ?
INCREMENTAL : CONSTANT);
if (airbrush_options->rate != 0.0)
{
airbrush_timeout.paint_core = paint_core;
airbrush_timeout.drawable = drawable;
rate = airbrush_options->paint_options.pressure_options->rate ?
(10000 / (airbrush_options->rate * 2.0 * paint_core->curpressure)) :
(10000 / airbrush_options->rate);
timer = gtk_timeout_add (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->paint_options.pressure_options,
airbrush_options->pressure,
airbrush_options->paint_options.incremental ?
INCREMENTAL : CONSTANT);
gdisplays_flush ();
/* restart the timer */
if (airbrush_options->rate != 0.0)
{
if (airbrush_options->paint_options.pressure_options->rate)
{
/* set a new timer */
timer = gtk_timeout_add ((10000 / (airbrush_options->rate * 2.0 * airbrush_timeout.paint_core->curpressure)),
airbrush_time_out, NULL);
return FALSE;
}
else
return TRUE;
}
else
return FALSE;
}
static void
airbrush_motion (PaintCore *paint_core,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
double pressure,
PaintApplicationMode mode)
{
GImage *gimage;
TempBuf * area;
unsigned char col[MAX_CHANNELS];
gdouble scale;
if (!drawable)
return;
if (! (gimage = drawable_gimage (drawable)))
return;
if (pressure_options->size)
scale = paint_core->curpressure;
else
scale = 1.0;
if (! (area = paint_core_get_paint_area (paint_core, drawable, scale)))
return;
/* color the pixels */
if (pressure_options->color)
{
gdouble r, g, b, a;
gradient_get_color_at (gimp_context_get_gradient (NULL),
paint_core->curpressure, &r, &g, &b, &a);
col[0] = r * 255.0;
col[1] = g * 255.0;
col[2] = b * 255.0;
col[3] = a * 255.0;
mode = INCREMENTAL;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
else if (GIMP_IS_BRUSH_PIXMAP (paint_core->brush))
{
mode = INCREMENTAL;
paint_core_color_area_with_pixmap (paint_core, gimage, drawable, area,
scale, SOFT);
}
else
{
gimage_get_foreground (gimage, drawable, col);
col[area->bytes - 1] = OPAQUE_OPACITY;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
if (pressure_options->pressure)
pressure = pressure * 2.0 * paint_core->curpressure;
/* paste the newly painted area to the image */
paint_core_paste_canvas (paint_core, drawable,
MIN (pressure, 255),
(gint) (gimp_context_get_opacity (NULL) * 255),
gimp_context_get_paint_mode (NULL),
SOFT, scale, mode);
}
static void *
airbrush_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
airbrush_motion (paint_core, drawable, &non_gui_pressure_options,
non_gui_pressure, non_gui_incremental);
return NULL;
}
gboolean
airbrush_non_gui_default (GimpDrawable *drawable,
int num_strokes,
double *stroke_array)
{
AirbrushOptions *options = airbrush_options;
gdouble pressure = AIRBRUSH_PRESSURE_DEFAULT;
if(options)
pressure = options->pressure;
return airbrush_non_gui (drawable, pressure, num_strokes, stroke_array);
}
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_pressure = pressure;
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];
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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