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gimp/app/paintbrush.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 <stdio.h>
#include <math.h>
#include "appenv.h"
#include "drawable.h"
#include "errors.h"
#include "gdisplay.h"
#include "gradient.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "palette.h"
#include "paint_options.h"
#include "paintbrush.h"
#include "selection.h"
#include "tool_options_ui.h"
#include "tools.h"
#include "libgimp/gimpintl.h"
/* defines */
#define PAINT_LEFT_THRESHOLD 0.05
/* the paintbrush structures */
typedef struct _PaintbrushOptions PaintbrushOptions;
struct _PaintbrushOptions
{
PaintOptions paint_options;
double fade_out;
double fade_out_d;
GtkObject *fade_out_w;
int use_gradient;
int use_gradient_d;
GtkWidget *use_gradient_w;
double gradient_length;
double gradient_length_d;
GtkObject *gradient_length_w;
int gradient_type;
int gradient_type_d;
GtkWidget *gradient_type_w[4]; /* 4 radio buttons */
gboolean incremental;
gboolean incremental_d;
GtkWidget *incremental_w;
};
/* the paint brush tool options */
static PaintbrushOptions * paintbrush_options = NULL;
/* local variables */
static double non_gui_fade_out;
static double non_gui_gradient_length;
static int non_gui_gradient_type;
static double non_gui_incremental;
/* forward function declarations */
static void paintbrush_motion (PaintCore *, GimpDrawable *,
double, double, gboolean, int);
/* functions */
static void
paintbrush_gradient_toggle_callback (GtkWidget *widget,
gpointer data)
{
PaintbrushOptions *options = paintbrush_options;
static int incremental_save = FALSE;
tool_options_toggle_update (widget, data);
if (paintbrush_options->use_gradient)
{
incremental_save = options->incremental;
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->incremental_w),
TRUE);
}
else
{
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->incremental_w),
incremental_save);
}
}
static void
paintbrush_gradient_type_callback (GtkWidget *widget,
gpointer data)
{
if (paintbrush_options)
paintbrush_options->gradient_type = (int) data;
}
static void
paintbrush_options_reset (void)
{
PaintbrushOptions *options = paintbrush_options;
paint_options_reset ((PaintOptions *) options);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->fade_out_w),
options->fade_out_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->use_gradient_w),
options->use_gradient_d);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->gradient_length_w),
options->gradient_length_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->gradient_type_w[options->gradient_type_d]),
TRUE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->incremental_w),
options->incremental_d);
}
static PaintbrushOptions *
paintbrush_options_new (void)
{
PaintbrushOptions *options;
GtkWidget *vbox;
GtkWidget *abox;
GtkWidget *table;
GtkWidget *label;
GtkWidget *scale;
GSList *group = NULL;
GtkWidget *radio_frame;
GtkWidget *radio_box;
GtkWidget *radio_button;
int i;
char *gradient_types[4] =
{
N_("Once Forward"),
N_("Once Backward"),
N_("Loop Sawtooth"),
N_("Loop Triangle")
};
/* the new paint tool options structure */
options = (PaintbrushOptions *) g_malloc (sizeof (PaintbrushOptions));
paint_options_init ((PaintOptions *) options,
PAINTBRUSH,
paintbrush_options_reset);
options->fade_out = options->fade_out_d = 0.0;
options->incremental = options->incremental_d = FALSE;
options->use_gradient = options->use_gradient_d = FALSE;
options->gradient_length = options->gradient_length_d = 10.0;
options->gradient_type = options->gradient_type_d = LOOP_TRIANGLE;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the fade-out scale */
table = gtk_table_new (4, 2, FALSE);
gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
gtk_table_set_row_spacing (GTK_TABLE (table), 0, 2);
gtk_table_set_row_spacing (GTK_TABLE (table), 2, 3);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
label = gtk_label_new (_("Fade Out:"));
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->fade_out_w =
gtk_adjustment_new (options->fade_out_d, 0.0, 1000.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->fade_out_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->fade_out_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->fade_out);
gtk_widget_show (scale);
/* the use gradient toggle */
options->use_gradient_w =
gtk_check_button_new_with_label (_("Gradient"));
gtk_table_attach (GTK_TABLE (table), options->use_gradient_w, 0, 1, 1, 2,
GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
gtk_signal_connect (GTK_OBJECT (options->use_gradient_w), "toggled",
(GtkSignalFunc) paintbrush_gradient_toggle_callback,
&options->use_gradient);
gtk_widget_show (options->use_gradient_w);
label = gtk_label_new (_("Length:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (label);
/* the gradient length scale */
abox = gtk_alignment_new (0.5, 1.0, 1.0, 0.0);
gtk_table_attach (GTK_TABLE (table), abox, 1, 2, 1, 3,
GTK_EXPAND | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show (abox);
options->gradient_length_w =
gtk_adjustment_new (options->gradient_length_d, 1.0, 50.0, 1.1, 0.1, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->gradient_length_w));
gtk_container_add (GTK_CONTAINER (abox), scale);
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->gradient_length_w), "value_changed",
(GtkSignalFunc) tool_options_double_adjustment_update,
&options->gradient_length);
gtk_widget_show (scale);
gtk_widget_show (table);
/* the radio frame and box */
radio_frame = gtk_frame_new (_("Gradient Type"));
gtk_table_attach_defaults (GTK_TABLE (table), radio_frame, 0, 2, 3, 4);
radio_box = gtk_vbox_new (FALSE, 1);
gtk_container_set_border_width (GTK_CONTAINER (radio_box), 2);
gtk_container_add (GTK_CONTAINER (radio_frame), radio_box);
/* the radio buttons */
group = NULL;
for (i = 0; i < 4; i++)
{
radio_button = gtk_radio_button_new_with_label (group, gradient_types[i]);
group = gtk_radio_button_group (GTK_RADIO_BUTTON (radio_button));
gtk_signal_connect (GTK_OBJECT (radio_button), "toggled",
(GtkSignalFunc) paintbrush_gradient_type_callback,
(void *)((long) i));
gtk_box_pack_start (GTK_BOX (radio_box), radio_button, FALSE, FALSE, 0);
gtk_widget_show (radio_button);
options->gradient_type_w[i] = radio_button;
}
gtk_widget_show (radio_box);
gtk_widget_show (radio_frame);
/* the incremental toggle */
options->incremental_w = gtk_check_button_new_with_label (_("Incremental"));
gtk_box_pack_start (GTK_BOX (vbox), options->incremental_w, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (options->incremental_w), "toggled",
(GtkSignalFunc) tool_options_toggle_update,
&options->incremental);
gtk_widget_show (options->incremental_w);
/* automatically set the sensitive state of the gradient stuff */
gtk_widget_set_sensitive (scale, options->use_gradient_d);
gtk_widget_set_sensitive (label, options->use_gradient_d);
gtk_widget_set_sensitive (radio_frame, options->use_gradient_d);
gtk_widget_set_sensitive (options->incremental_w, ! options->use_gradient_d);
gtk_object_set_data (GTK_OBJECT (options->use_gradient_w), "set_sensitive",
scale);
gtk_object_set_data (GTK_OBJECT (scale), "set_sensitive",
label);
gtk_object_set_data (GTK_OBJECT (label), "set_sensitive",
radio_frame);
gtk_object_set_data (GTK_OBJECT (options->use_gradient_w), "inverse_sensitive",
options->incremental_w);
return options;
}
#define TIMED_BRUSH 0
void *
paintbrush_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
#if TIMED_BRUSH
static GTimer *timer = NULL;
#endif
switch (state)
{
case INIT_PAINT :
#if TIMED_BRUSH
timer = g_timer_new();
g_timer_start(timer);
#endif /* TIMED_BRUSH */
break;
case MOTION_PAINT :
paintbrush_motion (paint_core, drawable,
paintbrush_options->fade_out,
paintbrush_options->use_gradient ?
exp(paintbrush_options->gradient_length/10) : 0,
paintbrush_options->incremental,
paintbrush_options->gradient_type);
break;
case FINISH_PAINT :
#if TIMED_BRUSH
if (timer)
{
g_timer_stop(timer);
printf("painting took %f:\n", g_timer_elapsed(timer, NULL));
g_timer_destroy(timer);
timer = NULL;
}
#endif /* TIMED_BRUSH */
break;
default :
break;
}
return NULL;
}
Tool *
tools_new_paintbrush ()
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! paintbrush_options)
{
paintbrush_options = paintbrush_options_new ();
tools_register (PAINTBRUSH, (ToolOptions *) paintbrush_options);
/* press all default buttons */
paintbrush_options_reset ();
}
tool = paint_core_new (PAINTBRUSH);
private = (PaintCore *) tool->private;
private->paint_func = paintbrush_paint_func;
private->pick_colors = TRUE;
return tool;
}
void
tools_free_paintbrush (Tool *tool)
{
paint_core_free (tool);
}
static void
paintbrush_motion (PaintCore *paint_core,
GimpDrawable *drawable,
double fade_out,
double gradient_length,
gboolean incremental,
int gradient_type)
{
GImage *gimage;
TempBuf * area;
double x, paint_left;
double position;
unsigned char local_blend = OPAQUE_OPACITY;
unsigned char temp_blend = OPAQUE_OPACITY;
unsigned char col[MAX_CHANNELS];
double r,g,b,a;
int mode;
position = 0.0;
if (! (gimage = drawable_gimage (drawable)))
return;
gimage_get_foreground (gimage, drawable, col);
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable)))
return;
/* factor in the fade out value */
if (fade_out)
{
/* Model the amount of paint left as a gaussian curve */
x = ((double) paint_core->distance / fade_out);
paint_left = exp (- x * x * 0.5);
local_blend = (int) (255 * paint_left);
}
if (local_blend)
{
/* set the alpha channel */
col[area->bytes - 1] = OPAQUE_OPACITY;
temp_blend = local_blend;
/* hard core to mode LOOP_TRIANGLE */
/* need to make a gui to handle this */
mode = gradient_type;
if(gradient_length)
{
paint_core_get_color_from_gradient (paint_core, gradient_length, &r,&g,&b,&a,mode);
r = r * 255.0;
g = g * 255.0;
b = b * 255.0;
a = a * 255.0;
temp_blend = (gint)((a * local_blend)/255);
col[0] = (gint)r;
col[1] = (gint)g;
col[2] = (gint)b;
/* always use incremental mode with gradients */
/* make the gui cool later */
incremental = INCREMENTAL;
}
/* just leave this because I know as soon as i delete it i'll find a bug */
/* printf("temp_blend: %u grad_len: %f distance: %f \n",temp_blend, gradient_length, distance); */
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
/* paste the newly painted canvas to the gimage which is being worked on */
paint_core_paste_canvas (paint_core, drawable, temp_blend,
(int) (PAINT_OPTIONS_GET_OPACITY (paintbrush_options) * 255),
PAINT_OPTIONS_GET_PAINT_MODE (paintbrush_options),
PRESSURE,
incremental ? INCREMENTAL : CONSTANT);
}
}
static void *
paintbrush_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
paintbrush_motion (paint_core, drawable, non_gui_fade_out,non_gui_gradient_length, non_gui_incremental, non_gui_gradient_type);
return NULL;
}
gboolean
paintbrush_non_gui (GimpDrawable *drawable,
int num_strokes,
double *stroke_array,
double fade_out,
int method,
double gradient_length)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
non_gui_fade_out = fade_out;
non_gui_gradient_length = gradient_length;
non_gui_gradient_type = LOOP_TRIANGLE;
non_gui_incremental = method;
/* Set the paint core's paint func */
non_gui_paint_core.paint_func = paintbrush_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)
paintbrush_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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