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gimp/app/eraser.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 "config.h"
#include <gdk/gdkkeysyms.h>
#include "appenv.h"
#include "cursorutil.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "gimpui.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "paint_options.h"
#include "eraser.h"
#include "selection.h"
#include "tools.h"
#include "libgimp/gimpintl.h"
/* Defaults */
#define ERASER_DEFAULT_HARD FALSE
#define ERASER_DEFAULT_INCREMENTAL FALSE
#define ERASER_DEFAULT_ANTI_ERASE FALSE
/* the eraser structures */
typedef struct _EraserOptions EraserOptions;
struct _EraserOptions
{
PaintOptions paint_options;
gboolean hard;
gboolean hard_d;
GtkWidget *hard_w;
gboolean anti_erase;
gboolean anti_erase_d;
GtkWidget *anti_erase_w;
};
/* the eraser tool options */
static EraserOptions *eraser_options = NULL;
/* local variables */
static gboolean non_gui_hard;
static gboolean non_gui_incremental;
static gboolean non_gui_anti_erase;
/* forward function declarations */
static void eraser_motion (PaintCore *, GimpDrawable *,
PaintPressureOptions *,
gboolean, gboolean, gboolean);
/* functions */
static void
eraser_options_reset (void)
{
EraserOptions *options = eraser_options;
paint_options_reset ((PaintOptions *) options);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->hard_w),
options->hard_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->anti_erase_w),
options->anti_erase_d);
}
static EraserOptions *
eraser_options_new (void)
{
EraserOptions *options;
GtkWidget *vbox;
/* the new eraser tool options structure */
options = g_new (EraserOptions, 1);
paint_options_init ((PaintOptions *) options,
ERASER,
eraser_options_reset);
options->hard = options->hard_d = ERASER_DEFAULT_HARD;
options->anti_erase = options->anti_erase_d = ERASER_DEFAULT_ANTI_ERASE;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the hard toggle */
options->hard_w = gtk_check_button_new_with_label (_("Hard Edge"));
gtk_box_pack_start (GTK_BOX (vbox), options->hard_w, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (options->hard_w), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&options->hard);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->hard_w),
options->hard_d);
gtk_widget_show (options->hard_w);
/* the anti_erase toggle */
options->anti_erase_w = gtk_check_button_new_with_label (_("Anti Erase"));
gtk_box_pack_start (GTK_BOX (vbox), options->anti_erase_w, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (options->anti_erase_w), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&options->anti_erase);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->anti_erase_w),
options->anti_erase_d);
gtk_widget_show (options->anti_erase_w);
return options;
}
static void
eraser_modifier_key_func (Tool *tool,
GdkEventKey *kevent,
gpointer gdisp_ptr)
{
switch (kevent->keyval)
{
case GDK_Alt_L:
case GDK_Alt_R:
break;
case GDK_Shift_L:
case GDK_Shift_R:
if (kevent->state & GDK_CONTROL_MASK) /* reset tool toggle */
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (eraser_options->anti_erase_w),
! eraser_options->anti_erase);
break;
case GDK_Control_L:
case GDK_Control_R:
if (!(kevent->state & GDK_SHIFT_MASK)) /* shift enables line draw mode */
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (eraser_options->anti_erase_w),
! eraser_options->anti_erase);
break;
}
tool->toggled = eraser_options->anti_erase;
}
void *
eraser_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
switch (state)
{
case INIT_PAINT:
break;
case MOTION_PAINT:
eraser_motion (paint_core,
drawable,
eraser_options->paint_options.pressure_options,
eraser_options->hard,
eraser_options->paint_options.incremental,
eraser_options->anti_erase);
break;
case FINISH_PAINT:
break;
default:
break;
}
return NULL;
}
Tool *
tools_new_eraser (void)
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! eraser_options)
{
eraser_options = eraser_options_new ();
tools_register (ERASER, (ToolOptions *) eraser_options);
}
tool = paint_core_new (ERASER);
private = (PaintCore *) tool->private;
private->paint_func = eraser_paint_func;
private->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
tool->modifier_key_func = eraser_modifier_key_func;
return tool;
}
void
tools_free_eraser (Tool *tool)
{
paint_core_free (tool);
}
static void
eraser_motion (PaintCore *paint_core,
GimpDrawable *drawable,
PaintPressureOptions *pressure_options,
gboolean hard,
gboolean incremental,
gboolean anti_erase)
{
GImage *gimage;
gint opacity;
TempBuf * area;
unsigned char col[MAX_CHANNELS];
gdouble scale;
if (! (gimage = drawable_gimage (drawable)))
return;
gimage_get_background (gimage, drawable, col);
if (pressure_options->size)
scale = paint_core->curpressure;
else
scale = 1.0;
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable, scale)))
return;
/* set the alpha channel */
col[area->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
opacity = 255 * gimp_context_get_opacity (NULL);
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_core->curpressure;
/* paste the newly painted canvas to the gimage which is being worked on */
paint_core_paste_canvas (paint_core, drawable,
MIN (opacity, 255),
(int) (gimp_context_get_opacity (NULL) * 255),
anti_erase ? ANTI_ERASE_MODE : ERASE_MODE,
hard ? HARD : (pressure_options->pressure ? PRESSURE : SOFT),
scale,
incremental ? INCREMENTAL : CONSTANT);
}
static void *
eraser_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
eraser_motion (paint_core, drawable,
&non_gui_pressure_options,
non_gui_hard, non_gui_incremental, non_gui_anti_erase);
return NULL;
}
gboolean
eraser_non_gui_default (GimpDrawable *drawable,
int num_strokes,
double *stroke_array)
{
gboolean hardness = ERASER_DEFAULT_HARD;
gboolean method = ERASER_DEFAULT_INCREMENTAL;
gboolean anti_erase = ERASER_DEFAULT_ANTI_ERASE;
EraserOptions *options = eraser_options;
if (options)
{
hardness = options->hard;
method = options->paint_options.incremental;
anti_erase = options->anti_erase;
}
return eraser_non_gui (drawable, num_strokes, stroke_array,
hardness, method, anti_erase);
}
gboolean
eraser_non_gui (GimpDrawable *drawable,
int num_strokes,
double *stroke_array,
int hardness,
int method,
int anti_erase)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
non_gui_hard = hardness;
non_gui_incremental = method;
non_gui_anti_erase = anti_erase;
/* Set the paint core's paint func */
non_gui_paint_core.paint_func = eraser_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];
eraser_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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