mirror of https://github.com/GNOME/gimp.git
425 lines
10 KiB
C
425 lines
10 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include "appenv.h"
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#include "gimpbrushlist.h"
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#include "drawable.h"
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#include "errors.h"
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#include "gdisplay.h"
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#include "paint_funcs.h"
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#include "paint_core.h"
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#include "palette.h"
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#include "airbrush.h"
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#include "selection.h"
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#include "tools.h"
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#include "gimage.h"
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typedef struct _AirbrushTimeout AirbrushTimeout;
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struct _AirbrushTimeout
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{
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PaintCore *paint_core;
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GimpDrawable *drawable;
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};
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/* forward function declarations */
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static void airbrush_motion (PaintCore *, GimpDrawable *, double);
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static gint airbrush_time_out (gpointer);
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static Argument * airbrush_invoker (Argument *);
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static double non_gui_pressure;
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/* The maximum amount of pressure that can be exerted */
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#define MAX_PRESSURE 0.075
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#define OFF 0
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#define ON 1
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typedef struct _AirbrushOptions AirbrushOptions;
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struct _AirbrushOptions
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{
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double rate;
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double pressure;
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};
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/* local variables */
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static gint timer; /* timer for successive paint applications */
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static int timer_state = OFF; /* state of airbrush tool */
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static AirbrushTimeout airbrush_timeout;
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static AirbrushOptions *airbrush_options = NULL;
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static void
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airbrush_scale_update (GtkAdjustment *adjustment,
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double *scale_val)
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{
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*scale_val = adjustment->value;
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}
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static AirbrushOptions *
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create_airbrush_options (void)
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{
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AirbrushOptions *options;
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GtkWidget *vbox;
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GtkWidget *hbox;
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GtkWidget *label;
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GtkWidget *rate_scale;
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GtkWidget *pressure_scale;
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GtkObject *rate_scale_data;
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GtkObject *pressure_scale_data;
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/* the new options structure */
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options = (AirbrushOptions *) g_malloc (sizeof (AirbrushOptions));
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options->rate = 80.0;
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options->pressure = 10.0;
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/* the main vbox */
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vbox = gtk_vbox_new (FALSE, 1);
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/* the main label */
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label = gtk_label_new ("Airbrush Options");
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gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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/* the rate scale */
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hbox = gtk_hbox_new (FALSE, 1);
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gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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gtk_widget_show (hbox);
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label = gtk_label_new ("Rate");
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gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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rate_scale_data = gtk_adjustment_new (80.0, 0.0, 150.0, 1.0, 1.0, 0.0);
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rate_scale = gtk_hscale_new (GTK_ADJUSTMENT (rate_scale_data));
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gtk_box_pack_start (GTK_BOX (hbox), rate_scale, TRUE, TRUE, 0);
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gtk_scale_set_value_pos (GTK_SCALE (rate_scale), GTK_POS_TOP);
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gtk_range_set_update_policy (GTK_RANGE (rate_scale), GTK_UPDATE_DELAYED);
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gtk_signal_connect (GTK_OBJECT (rate_scale_data), "value_changed",
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(GtkSignalFunc) airbrush_scale_update, &options->rate);
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gtk_widget_show (rate_scale);
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/* the pressure scale */
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hbox = gtk_hbox_new (FALSE, 1);
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gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
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gtk_widget_show (hbox);
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label = gtk_label_new ("Pressure");
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gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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pressure_scale_data = gtk_adjustment_new (10.0, 0.0, 100.0, 1.0, 1.0, 0.0);
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pressure_scale = gtk_hscale_new (GTK_ADJUSTMENT (pressure_scale_data));
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gtk_box_pack_start (GTK_BOX (hbox), pressure_scale, TRUE, TRUE, 0);
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gtk_scale_set_value_pos (GTK_SCALE (pressure_scale), GTK_POS_TOP);
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gtk_range_set_update_policy (GTK_RANGE (pressure_scale), GTK_UPDATE_DELAYED);
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gtk_signal_connect (GTK_OBJECT (pressure_scale_data), "value_changed",
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(GtkSignalFunc) airbrush_scale_update, &options->pressure);
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gtk_widget_show (pressure_scale);
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/* Register this selection options widget with the main tools options dialog */
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tools_register_options (AIRBRUSH, vbox);
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return options;
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}
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void *
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airbrush_paint_func (PaintCore *paint_core,
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GimpDrawable *drawable,
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int state)
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{
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GimpBrushP brush;
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if (!drawable)
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return NULL;
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brush = get_active_brush ();
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switch (state)
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{
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case INIT_PAINT :
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timer_state = OFF;
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break;
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case MOTION_PAINT :
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if (timer_state == ON)
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gtk_timeout_remove (timer);
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timer_state = OFF;
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airbrush_motion (paint_core, drawable, airbrush_options->pressure);
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if (airbrush_options->rate != 0.0)
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{
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airbrush_timeout.paint_core = paint_core;
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airbrush_timeout.drawable = drawable;
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timer = gtk_timeout_add ((10000 / airbrush_options->rate),
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airbrush_time_out, NULL);
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timer_state = ON;
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}
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break;
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case FINISH_PAINT :
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if (timer_state == ON)
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gtk_timeout_remove (timer);
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timer_state = OFF;
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break;
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default :
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break;
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}
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return NULL;
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}
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Tool *
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tools_new_airbrush ()
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{
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Tool * tool;
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PaintCore * private;
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if (! airbrush_options)
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airbrush_options = create_airbrush_options ();
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tool = paint_core_new (AIRBRUSH);
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private = (PaintCore *) tool->private;
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private->paint_func = airbrush_paint_func;
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return tool;
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}
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void
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tools_free_airbrush (Tool *tool)
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{
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paint_core_free (tool);
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if (timer_state == ON)
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gtk_timeout_remove (timer);
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timer_state = OFF;
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}
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static gint
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airbrush_time_out (gpointer client_data)
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{
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/* service the timer */
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airbrush_motion (airbrush_timeout.paint_core,
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airbrush_timeout.drawable,
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airbrush_options->pressure);
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gdisplays_flush ();
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/* restart the timer */
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if (airbrush_options->rate != 0.0)
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return TRUE;
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else
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return FALSE;
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}
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static void
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airbrush_motion (PaintCore *paint_core,
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GimpDrawable *drawable,
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double pressure)
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{
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gint opacity;
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GImage *gimage;
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TempBuf * area;
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unsigned char col[MAX_CHANNELS];
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if (!drawable)
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return;
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if (! (gimage = drawable_gimage (drawable)))
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return;
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gimage_get_foreground (gimage, drawable, col);
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if (! (area = paint_core_get_paint_area (paint_core, drawable)))
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return;
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/* color the pixels */
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col[area->bytes - 1] = OPAQUE_OPACITY;
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/* color the pixels */
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color_pixels (temp_buf_data (area), col,
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area->width * area->height, area->bytes);
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opacity = pressure * (paint_core->curpressure / 0.5);
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if (opacity > 255)
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opacity = 255;
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/* paste the newly painted area to the image */
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paint_core_paste_canvas (paint_core, drawable,
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opacity,
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(int) (gimp_brush_get_opacity () * 255),
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gimp_brush_get_paint_mode (),
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SOFT, CONSTANT);
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}
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static void *
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airbrush_non_gui_paint_func (PaintCore *paint_core,
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GimpDrawable *drawable,
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int state)
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{
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airbrush_motion (paint_core, drawable, non_gui_pressure);
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return NULL;
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}
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/* The airbrush procedure definition */
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ProcArg airbrush_args[] =
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{
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{ PDB_IMAGE,
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"image",
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"the image"
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},
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{ PDB_DRAWABLE,
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"drawable",
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"the drawable"
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},
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{ PDB_FLOAT,
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"pressure",
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"The pressure of the airbrush strokes: 0 <= pressure <= 100"
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},
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{ PDB_INT32,
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"num_strokes",
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"number of stroke control points (count each coordinate as 2 points)"
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},
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{ PDB_FLOATARRAY,
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"strokes",
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"array of stroke coordinates: {s1.x, s1.y, s2.x, s2.y, ..., sn.x, sn.y}"
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}
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};
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ProcRecord airbrush_proc =
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{
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"gimp_airbrush",
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"Paint in the current brush with varying pressure. Paint application is time-dependent",
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"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.",
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"Spencer Kimball & Peter Mattis",
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"Spencer Kimball & Peter Mattis",
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"1995-1996",
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PDB_INTERNAL,
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/* Input arguments */
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5,
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airbrush_args,
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/* Output arguments */
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0,
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NULL,
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/* Exec method */
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{ { airbrush_invoker } },
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};
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static Argument *
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airbrush_invoker (Argument *args)
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{
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int success = TRUE;
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GImage *gimage;
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GimpDrawable *drawable;
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int num_strokes;
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double *stroke_array;
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int int_value;
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double fp_value;
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int i;
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drawable = NULL;
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num_strokes = 0;
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/* the gimage */
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if (success)
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{
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int_value = args[0].value.pdb_int;
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if (! (gimage = gimage_get_ID (int_value)))
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success = FALSE;
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}
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/* the drawable */
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if (success)
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{
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int_value = args[1].value.pdb_int;
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drawable = drawable_get_ID (int_value);
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if (drawable == NULL || gimage != drawable_gimage (drawable))
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success = FALSE;
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}
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/* pressure */
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if (success)
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{
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fp_value = args[2].value.pdb_float;
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if (fp_value >= 0.0 && fp_value <= 100.0)
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non_gui_pressure = fp_value;
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else
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success = FALSE;
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}
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/* num strokes */
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if (success)
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{
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int_value = args[3].value.pdb_int;
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if (int_value > 0)
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num_strokes = int_value / 2;
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else
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success = FALSE;
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}
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/* point array */
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if (success)
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stroke_array = (double *) args[4].value.pdb_pointer;
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if (success)
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/* init the paint core */
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success = paint_core_init (&non_gui_paint_core, drawable,
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stroke_array[0], stroke_array[1]);
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if (success)
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{
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/* set the paint core's paint func */
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non_gui_paint_core.paint_func = airbrush_non_gui_paint_func;
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non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
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non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
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if (num_strokes == 1)
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airbrush_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
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for (i = 1; i < num_strokes; i++)
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{
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non_gui_paint_core.curx = stroke_array[i * 2 + 0];
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non_gui_paint_core.cury = stroke_array[i * 2 + 1];
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paint_core_interpolate (&non_gui_paint_core, drawable);
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non_gui_paint_core.lastx = non_gui_paint_core.curx;
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non_gui_paint_core.lasty = non_gui_paint_core.cury;
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}
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/* finish the painting */
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paint_core_finish (&non_gui_paint_core, drawable, -1);
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/* cleanup */
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paint_core_cleanup ();
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}
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return procedural_db_return_args (&airbrush_proc, success);
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}
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