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gimp/app/free_select.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 <string.h>
#include "appenv.h"
#include "draw_core.h"
#include "edit_selection.h"
#include "errors.h"
#include "floating_sel.h"
#include "free_select.h"
#include "gimage_mask.h"
#include "gdisplay.h"
#include "rect_select.h"
#include "selection_options.h"
#include "scan_convert.h"
#include "libgimp/gimpmath.h"
#define DEFAULT_MAX_INC 1024
#define SUPERSAMPLE 3
#define SUPERSAMPLE2 9
/* the free selection structures */
typedef struct _FreeSelect FreeSelect;
struct _FreeSelect
{
DrawCore *core; /* Core select object */
SelectOps op; /* selection operation (ADD, SUB, etc) */
gint current_x; /* these values are updated on every motion event */
gint current_y; /* (enables immediate cursor updating on modifier
* key events). */
gint num_pts; /* Number of points in the polygon */
};
/* the free selection tool options */
static SelectionOptions * free_options = NULL;
/* The global array of XPoints for drawing the polygon... */
static GdkPoint *global_pts = NULL;
static gint max_segs = 0;
/* functions */
static gint
add_point (gint num_pts,
gint x,
gint y)
{
if (num_pts >= max_segs)
{
max_segs += DEFAULT_MAX_INC;
global_pts = (GdkPoint *) g_realloc ((void *) global_pts, sizeof (GdkPoint) * max_segs);
if (!global_pts)
gimp_fatal_error ("add_point(): Unable to reallocate points array in free_select.");
}
global_pts[num_pts].x = x;
global_pts[num_pts].y = y;
return 1;
}
static Channel *
scan_convert (GimpImage *gimage,
gint num_pts,
ScanConvertPoint *pts,
gint width,
gint height,
gboolean antialias)
{
Channel *mask;
ScanConverter *sc;
sc = scan_converter_new (width, height, antialias ? SUPERSAMPLE : 1);
scan_converter_add_points (sc, num_pts, pts);
mask = scan_converter_to_channel (sc, gimage);
scan_converter_free (sc);
return mask;
}
/*************************************/
/* Polygonal selection apparatus */
void
free_select (GImage *gimage,
gint num_pts,
ScanConvertPoint *pts,
SelectOps op,
gboolean antialias,
gboolean feather,
gdouble feather_radius)
{
Channel *mask;
/* if applicable, replace the current selection */
/* or insure that a floating selection is anchored down... */
if (op == SELECTION_REPLACE)
gimage_mask_clear (gimage);
else
gimage_mask_undo (gimage);
mask = scan_convert (gimage, num_pts, pts,
gimage->width, gimage->height, antialias);
if (mask)
{
if (feather)
channel_feather (mask, gimage_get_mask (gimage),
feather_radius,
feather_radius,
op, 0, 0);
else
channel_combine_mask (gimage_get_mask (gimage),
mask, op, 0, 0);
channel_delete (mask);
}
}
void
free_select_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
FreeSelect *free_sel;
gdisp = (GDisplay *) gdisp_ptr;
free_sel = (FreeSelect *) tool->private;
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->state = ACTIVE;
tool->gdisp_ptr = gdisp_ptr;
switch (free_sel->op)
{
case SELECTION_MOVE_MASK:
init_edit_selection (tool, gdisp_ptr, bevent, EDIT_MASK_TRANSLATE);
return;
case SELECTION_MOVE:
init_edit_selection (tool, gdisp_ptr, bevent, EDIT_MASK_TO_LAYER_TRANSLATE);
return;
default:
break;
}
add_point (0, bevent->x, bevent->y);
free_sel->num_pts = 1;
draw_core_start (free_sel->core,
gdisp->canvas->window,
tool);
}
void
free_select_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
FreeSelect *free_sel;
ScanConvertPoint *pts;
GDisplay *gdisp;
gint i;
gdisp = (GDisplay *) gdisp_ptr;
free_sel = (FreeSelect *) tool->private;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
draw_core_stop (free_sel->core, tool);
tool->state = INACTIVE;
/* First take care of the case where the user "cancels" the action */
if (! (bevent->state & GDK_BUTTON3_MASK))
{
if (free_sel->op == SELECTION_ANCHOR)
{
/* If there is a floating selection, anchor it */
if (gimage_floating_sel (gdisp->gimage))
floating_sel_anchor (gimage_floating_sel (gdisp->gimage));
/* Otherwise, clear the selection mask */
else
gimage_mask_clear (gdisp->gimage);
gdisplays_flush ();
return;
}
pts = g_new (ScanConvertPoint, free_sel->num_pts);
for (i = 0; i < free_sel->num_pts; i++)
{
gdisplay_untransform_coords_f (gdisp, global_pts[i].x, global_pts[i].y,
&pts[i].x, &pts[i].y, FALSE);
}
free_select (gdisp->gimage, free_sel->num_pts, pts, free_sel->op,
free_options->antialias, free_options->feather,
free_options->feather_radius);
g_free (pts);
gdisplays_flush ();
}
}
void
free_select_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
FreeSelect *free_sel;
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
free_sel = (FreeSelect *) tool->private;
/* needed for immediate cursor update on modifier event */
free_sel->current_x = mevent->x;
free_sel->current_y = mevent->y;
if (tool->state != ACTIVE)
return;
if (free_sel->op == SELECTION_ANCHOR)
{
free_sel->op = SELECTION_REPLACE;
rect_select_cursor_update (tool, mevent, gdisp_ptr);
}
if (add_point (free_sel->num_pts, mevent->x, mevent->y))
{
gdk_draw_line (free_sel->core->win, free_sel->core->gc,
global_pts[free_sel->num_pts - 1].x,
global_pts[free_sel->num_pts - 1].y,
global_pts[free_sel->num_pts].x,
global_pts[free_sel->num_pts].y);
free_sel->num_pts ++;
}
}
static void
free_select_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
FreeSelect *free_sel;
free_sel = (FreeSelect *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (free_sel->core, tool);
break;
case RESUME:
draw_core_resume (free_sel->core, tool);
break;
case HALT:
draw_core_stop (free_sel->core, tool);
break;
default:
break;
}
}
void
free_select_draw (Tool *tool)
{
FreeSelect *free_sel;
gint i;
free_sel = (FreeSelect *) tool->private;
for (i = 1; i < free_sel->num_pts; i++)
gdk_draw_line (free_sel->core->win, free_sel->core->gc,
global_pts[i - 1].x, global_pts[i - 1].y,
global_pts[i].x, global_pts[i].y);
}
static void
free_select_options_reset (void)
{
selection_options_reset (free_options);
}
Tool *
tools_new_free_select (void)
{
Tool *tool;
FreeSelect *private;
/* The tool options */
if (!free_options)
{
free_options =
selection_options_new (FREE_SELECT, free_select_options_reset);
tools_register (FREE_SELECT, (ToolOptions *) free_options);
}
tool = tools_new_tool (FREE_SELECT);
private = g_new0 (FreeSelect, 1);
private->core = draw_core_new (free_select_draw);
private->num_pts = 0;
private->op = SELECTION_REPLACE;
tool->scroll_lock = TRUE; /* Do not allow scrolling */
tool->private = (void *) private;
tool->button_press_func = free_select_button_press;
tool->button_release_func = free_select_button_release;
tool->motion_func = free_select_motion;
tool->modifier_key_func = rect_select_modifier_update;
tool->cursor_update_func = rect_select_cursor_update;
tool->oper_update_func = rect_select_oper_update;
tool->control_func = free_select_control;
return tool;
}
void
tools_free_free_select (Tool *tool)
{
FreeSelect *free_sel;
free_sel = (FreeSelect *) tool->private;
draw_core_free (free_sel->core);
g_free (free_sel);
}
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