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gimp/app/fuzzy_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 "config.h"
#include <stdlib.h>
#include "appenv.h"
#include "boundary.h"
#include "cursorutil.h"
#include "draw_core.h"
#include "drawable.h"
#include "edit_selection.h"
#include "fuzzy_select.h"
#include "gimage_mask.h"
#include "gimprc.h"
#include "gimpui.h"
#include "gdisplay.h"
#include "rect_select.h"
#include "selection_options.h"
#include "tile.h" /* ick. */
#include "libgimp/gimpmath.h"
#include "libgimp/gimpintl.h"
/* the fuzzy selection structures */
typedef struct _FuzzySelect FuzzySelect;
struct _FuzzySelect
{
DrawCore *core; /* Core select object */
gint 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 x, y; /* Point from which to execute seed fill */
gint first_x; /* */
gint first_y; /* variables to keep track of sensitivity */
gdouble first_threshold; /* initial value of threshold slider */
};
/* the fuzzy selection tool options */
static SelectionOptions *fuzzy_options = NULL;
/* XSegments which make up the fuzzy selection boundary */
static GdkSegment *segs = NULL;
static gint num_segs = 0;
Channel * fuzzy_mask = NULL;
/* fuzzy select action functions */
static void fuzzy_select_button_press (Tool *, GdkEventButton *, gpointer);
static void fuzzy_select_button_release (Tool *, GdkEventButton *, gpointer);
static void fuzzy_select_motion (Tool *, GdkEventMotion *, gpointer);
static void fuzzy_select_control (Tool *, ToolAction, gpointer);
static void fuzzy_select_draw (Tool *);
/* fuzzy select action functions */
static GdkSegment * fuzzy_select_calculate (Tool *, void *, int *);
/*************************************/
/* Fuzzy selection apparatus */
static gint
is_pixel_sufficiently_different (guchar *col1,
guchar *col2,
gboolean antialias,
gint threshold,
gint bytes,
gboolean has_alpha)
{
gint diff;
gint max;
gint b;
gint alpha;
max = 0;
alpha = (has_alpha) ? bytes - 1 : bytes;
/* if there is an alpha channel, never select transparent regions */
if (has_alpha && col2[alpha] == 0)
return 0;
for (b = 0; b < bytes; b++)
{
diff = col1[b] - col2[b];
diff = abs (diff);
if (diff > max)
max = diff;
}
if (antialias)
{
float aa;
aa = 1.5 - ((float) max / threshold);
if (aa <= 0)
return 0;
else if (aa < 0.5)
return (unsigned char) (aa * 512);
else
return 255;
}
else
{
if (max > threshold)
return 0;
else
return 255;
}
}
static void
ref_tiles (TileManager *src,
TileManager *mask,
Tile **s_tile,
Tile **m_tile,
gint x,
gint y,
guchar **s,
guchar **m)
{
if (*s_tile != NULL)
tile_release (*s_tile, FALSE);
if (*m_tile != NULL)
tile_release (*m_tile, TRUE);
*s_tile = tile_manager_get_tile (src, x, y, TRUE, FALSE);
*m_tile = tile_manager_get_tile (mask, x, y, TRUE, TRUE);
*s = tile_data_pointer (*s_tile, x % TILE_WIDTH, y % TILE_HEIGHT);
*m = tile_data_pointer (*m_tile, x % TILE_WIDTH, y % TILE_HEIGHT);
}
static int
find_contiguous_segment (guchar *col,
PixelRegion *src,
PixelRegion *mask,
gint width,
gint bytes,
gboolean has_alpha,
gboolean antialias,
gint threshold,
gint initial,
gint *start,
gint *end)
{
guchar *s;
guchar *m;
guchar diff;
Tile *s_tile = NULL;
Tile *m_tile = NULL;
ref_tiles (src->tiles, mask->tiles, &s_tile, &m_tile, src->x, src->y, &s, &m);
/* check the starting pixel */
if (! (diff = is_pixel_sufficiently_different (col, s, antialias,
threshold, bytes, has_alpha)))
{
tile_release (s_tile, FALSE);
tile_release (m_tile, TRUE);
return FALSE;
}
*m-- = diff;
s -= bytes;
*start = initial - 1;
while (*start >= 0 && diff)
{
if (! ((*start + 1) % TILE_WIDTH))
ref_tiles (src->tiles, mask->tiles, &s_tile, &m_tile, *start, src->y, &s, &m);
diff = is_pixel_sufficiently_different (col, s, antialias,
threshold, bytes, has_alpha);
if ((*m-- = diff))
{
s -= bytes;
(*start)--;
}
}
diff = 1;
*end = initial + 1;
if (*end % TILE_WIDTH && *end < width)
ref_tiles (src->tiles, mask->tiles, &s_tile, &m_tile, *end, src->y, &s, &m);
while (*end < width && diff)
{
if (! (*end % TILE_WIDTH))
ref_tiles (src->tiles, mask->tiles, &s_tile, &m_tile, *end, src->y, &s, &m);
diff = is_pixel_sufficiently_different (col, s, antialias,
threshold, bytes, has_alpha);
if ((*m++ = diff))
{
s += bytes;
(*end)++;
}
}
tile_release (s_tile, FALSE);
tile_release (m_tile, TRUE);
return TRUE;
}
static void
find_contiguous_region_helper (PixelRegion *mask,
PixelRegion *src,
gboolean has_alpha,
gboolean antialias,
gint threshold,
gboolean indexed,
gint x,
gint y,
guchar *col)
{
gint start, end, i;
gint val;
gint bytes;
Tile *tile;
if (threshold == 0) threshold = 1;
if (x < 0 || x >= src->w) return;
if (y < 0 || y >= src->h) return;
tile = tile_manager_get_tile (mask->tiles, x, y, TRUE, FALSE);
val = *(guchar *)(tile_data_pointer (tile,
x % TILE_WIDTH, y % TILE_HEIGHT));
tile_release (tile, FALSE);
if (val != 0)
return;
src->x = x;
src->y = y;
bytes = src->bytes;
if(indexed)
{
bytes = has_alpha ? 4 : 3;
}
if (! find_contiguous_segment (col, src, mask, src->w,
src->bytes, has_alpha,
antialias, threshold, x, &start, &end))
return;
for (i = start + 1; i < end; i++)
{
find_contiguous_region_helper (mask, src, has_alpha, antialias,
threshold, indexed, i, y - 1, col);
find_contiguous_region_helper (mask, src, has_alpha, antialias,
threshold, indexed, i, y + 1, col);
}
}
Channel *
find_contiguous_region (GImage *gimage,
GimpDrawable *drawable,
gboolean antialias,
gint threshold,
gint x,
gint y,
gboolean sample_merged)
{
PixelRegion srcPR, maskPR;
Channel *mask;
guchar *start;
gboolean has_alpha;
gboolean indexed;
gint type;
gint bytes;
Tile *tile;
if (sample_merged)
{
pixel_region_init (&srcPR, gimage_composite (gimage), 0, 0,
gimage->width, gimage->height, FALSE);
type = gimage_composite_type (gimage);
has_alpha = (type == RGBA_GIMAGE ||
type == GRAYA_GIMAGE ||
type == INDEXEDA_GIMAGE);
}
else
{
pixel_region_init (&srcPR, drawable_data (drawable), 0, 0,
drawable_width (drawable), drawable_height (drawable),
FALSE);
has_alpha = drawable_has_alpha (drawable);
}
indexed = drawable_indexed (drawable);
bytes = drawable_bytes (drawable);
if (indexed)
{
bytes = has_alpha ? 4 : 3;
}
mask = channel_new_mask (gimage, srcPR.w, srcPR.h);
pixel_region_init (&maskPR, drawable_data (GIMP_DRAWABLE(mask)), 0, 0,
drawable_width (GIMP_DRAWABLE(mask)),
drawable_height (GIMP_DRAWABLE(mask)),
TRUE);
tile = tile_manager_get_tile (srcPR.tiles, x, y, TRUE, FALSE);
if (tile)
{
start = tile_data_pointer (tile, x%TILE_WIDTH, y%TILE_HEIGHT);
find_contiguous_region_helper (&maskPR, &srcPR, has_alpha, antialias,
threshold, bytes, x, y, start);
tile_release (tile, FALSE);
}
return mask;
}
void
fuzzy_select (GImage *gimage,
GimpDrawable *drawable,
gint op,
gboolean feather,
gdouble feather_radius)
{
gint off_x, off_y;
/* if applicable, replace the current selection */
if (op == REPLACE)
gimage_mask_clear (gimage);
else
gimage_mask_undo (gimage);
if (drawable) /* NULL if sample_merged is active */
drawable_offsets (drawable, &off_x, &off_y);
else
off_x = off_y = 0;
if (feather)
channel_feather (fuzzy_mask, gimage_get_mask (gimage),
feather_radius,
feather_radius,
op, off_x, off_y);
else
channel_combine_mask (gimage_get_mask (gimage),
fuzzy_mask, op, off_x, off_y);
/* free the fuzzy region struct */
channel_delete (fuzzy_mask);
fuzzy_mask = NULL;
}
/* fuzzy select action functions */
static void
fuzzy_select_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
FuzzySelect *fuzzy_sel;
gdisp = (GDisplay *) gdisp_ptr;
fuzzy_sel = (FuzzySelect *) tool->private;
fuzzy_sel->x = bevent->x;
fuzzy_sel->y = bevent->y;
fuzzy_sel->first_x = fuzzy_sel->x;
fuzzy_sel->first_y = fuzzy_sel->y;
fuzzy_sel->first_threshold = fuzzy_options->threshold;
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;
if (fuzzy_sel->op == SELECTION_MOVE_MASK)
{
init_edit_selection (tool, gdisp_ptr, bevent, MaskTranslate);
return;
}
else if (fuzzy_sel->op == SELECTION_MOVE)
{
init_edit_selection (tool, gdisp_ptr, bevent, MaskToLayerTranslate);
return;
}
/* calculate the region boundary */
segs = fuzzy_select_calculate (tool, gdisp_ptr, &num_segs);
draw_core_start (fuzzy_sel->core,
gdisp->canvas->window,
tool);
}
static void
fuzzy_select_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
FuzzySelect *fuzzy_sel;
GDisplay *gdisp;
GimpDrawable *drawable;
gdisp = (GDisplay *) gdisp_ptr;
fuzzy_sel = (FuzzySelect *) tool->private;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
draw_core_stop (fuzzy_sel->core, tool);
tool->state = INACTIVE;
/* First take care of the case where the user "cancels" the action */
if (! (bevent->state & GDK_BUTTON3_MASK))
{
drawable = (fuzzy_options->sample_merged ?
NULL : gimage_active_drawable (gdisp->gimage));
fuzzy_select (gdisp->gimage, drawable, fuzzy_sel->op,
fuzzy_options->feather,
fuzzy_options->feather_radius);
gdisplays_flush ();
}
/* If the segment array is allocated, free it */
if (segs)
g_free (segs);
segs = NULL;
}
static void
fuzzy_select_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
FuzzySelect *fuzzy_sel;
GdkSegment *new_segs;
gint num_new_segs;
gint diff_x, diff_y;
gdouble diff;
static guint last_time = 0;
fuzzy_sel = (FuzzySelect *) tool->private;
/* needed for immediate cursor update on modifier event */
fuzzy_sel->current_x = mevent->x;
fuzzy_sel->current_y = mevent->y;
if (tool->state != ACTIVE)
return;
/* don't let the events come in too fast, ignore below a delay of 100 ms */
if (ABS (mevent->time - last_time) < 100)
return;
last_time = mevent->time;
diff_x = mevent->x - fuzzy_sel->first_x;
diff_y = mevent->y - fuzzy_sel->first_y;
diff = ((ABS (diff_x) > ABS (diff_y)) ? diff_x : diff_y) / 2.0;
gtk_adjustment_set_value (GTK_ADJUSTMENT (fuzzy_options->threshold_w),
fuzzy_sel->first_threshold + diff);
/* calculate the new fuzzy boundary */
new_segs = fuzzy_select_calculate (tool, gdisp_ptr, &num_new_segs);
/* stop the current boundary */
draw_core_pause (fuzzy_sel->core, tool);
/* make sure the XSegment array is freed before we assign the new one */
if (segs)
g_free (segs);
segs = new_segs;
num_segs = num_new_segs;
/* start the new boundary */
draw_core_resume (fuzzy_sel->core, tool);
}
static GdkSegment *
fuzzy_select_calculate (Tool *tool,
void *gdisp_ptr,
gint *nsegs)
{
PixelRegion maskPR;
FuzzySelect *fuzzy_sel;
GDisplay *gdisp;
Channel *new;
GdkSegment *segs;
BoundSeg *bsegs;
GimpDrawable *drawable;
gint i;
gint x, y;
gboolean use_offsets;
fuzzy_sel = (FuzzySelect *) tool->private;
gdisp = (GDisplay *) gdisp_ptr;
drawable = gimage_active_drawable (gdisp->gimage);
gimp_add_busy_cursors ();
use_offsets = fuzzy_options->sample_merged ? FALSE : TRUE;
gdisplay_untransform_coords (gdisp, fuzzy_sel->x,
fuzzy_sel->y, &x, &y, FALSE, use_offsets);
new = find_contiguous_region (gdisp->gimage, drawable,
fuzzy_options->antialias,
fuzzy_options->threshold, x, y,
fuzzy_options->sample_merged);
if (fuzzy_mask)
channel_delete (fuzzy_mask);
fuzzy_mask = channel_ref (new);
/* calculate and allocate a new XSegment array which represents the boundary
* of the color-contiguous region
*/
pixel_region_init (&maskPR, drawable_data (GIMP_DRAWABLE (fuzzy_mask)), 0, 0,
drawable_width (GIMP_DRAWABLE (fuzzy_mask)),
drawable_height (GIMP_DRAWABLE (fuzzy_mask)),
FALSE);
bsegs = find_mask_boundary (&maskPR, nsegs, WithinBounds,
0, 0,
drawable_width (GIMP_DRAWABLE (fuzzy_mask)),
drawable_height (GIMP_DRAWABLE (fuzzy_mask)));
segs = g_new (GdkSegment, *nsegs);
for (i = 0; i < *nsegs; i++)
{
gdisplay_transform_coords (gdisp, bsegs[i].x1, bsegs[i].y1, &x, &y, use_offsets);
segs[i].x1 = x; segs[i].y1 = y;
gdisplay_transform_coords (gdisp, bsegs[i].x2, bsegs[i].y2, &x, &y, use_offsets);
segs[i].x2 = x; segs[i].y2 = y;
}
/* free boundary segments */
g_free (bsegs);
gimp_remove_busy_cursors (NULL);
return segs;
}
static void
fuzzy_select_draw (Tool *tool)
{
FuzzySelect *fuzzy_sel;
fuzzy_sel = (FuzzySelect *) tool->private;
if (segs)
gdk_draw_segments (fuzzy_sel->core->win, fuzzy_sel->core->gc, segs, num_segs);
}
static void
fuzzy_select_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
FuzzySelect *fuzzy_sel;
fuzzy_sel = (FuzzySelect *) tool->private;
switch (action)
{
case PAUSE :
draw_core_pause (fuzzy_sel->core, tool);
break;
case RESUME :
draw_core_resume (fuzzy_sel->core, tool);
break;
case HALT :
draw_core_stop (fuzzy_sel->core, tool);
break;
default:
break;
}
}
static void
fuzzy_select_options_reset (void)
{
selection_options_reset (fuzzy_options);
}
Tool *
tools_new_fuzzy_select (void)
{
Tool *tool;
FuzzySelect *private;
/* The tool options */
if (! fuzzy_options)
{
fuzzy_options = selection_options_new (FUZZY_SELECT,
fuzzy_select_options_reset);
tools_register (FUZZY_SELECT, (ToolOptions *) fuzzy_options);
}
tool = tools_new_tool (FUZZY_SELECT);
private = g_new0 (FuzzySelect, 1);
private->core = draw_core_new (fuzzy_select_draw);
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->private = (void *) private;
tool->button_press_func = fuzzy_select_button_press;
tool->button_release_func = fuzzy_select_button_release;
tool->motion_func = fuzzy_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 = fuzzy_select_control;
return tool;
}
void
tools_free_fuzzy_select (Tool *tool)
{
FuzzySelect *fuzzy_sel;
fuzzy_sel = (FuzzySelect *) tool->private;
draw_core_free (fuzzy_sel->core);
g_free (fuzzy_sel);
}
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