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gimp/app/tools/gimpfuzzyselecttool.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 <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "libgimpmath/gimpmath.h"
#include "tools-types.h"
#include "base/boundary.h"
#include "base/pixel-region.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "core/gimp.h"
#include "core/gimpchannel.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimpimage-mask.h"
#include "gimpeditselectiontool.h"
#include "gimpfuzzyselecttool.h"
#include "gimptool.h"
#include "selection_options.h"
#include "tool_options.h"
#include "tool_manager.h"
#include "gdisplay.h"
#include "gimprc.h"
#include "libgimp/gimpintl.h"
static void gimp_fuzzy_select_tool_class_init (GimpFuzzySelectToolClass *klass);
static void gimp_fuzzy_select_tool_init (GimpFuzzySelectTool *fuzzy_select);
static void gimp_fuzzy_select_tool_button_press (GimpTool *tool,
GdkEventButton *bevent,
GDisplay *gdisp);
static void gimp_fuzzy_select_tool_button_release (GimpTool *tool,
GdkEventButton *bevent,
GDisplay *gdisp);
static void gimp_fuzzy_select_tool_motion (GimpTool *tool,
GdkEventMotion *mevent,
GDisplay *gdisp);
static void gimp_fuzzy_select_tool_draw (GimpDrawTool *draw_tool);
static GdkSegment * fuzzy_select_calculate (GimpFuzzySelectTool *fuzzy_sel,
GDisplay *gdisp,
gint *nsegs);
static GimpSelectionToolClass *parent_class = NULL;
/* 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;
GimpChannel * fuzzy_mask = NULL;
/* public functions */
void
gimp_fuzzy_select_tool_register (Gimp *gimp)
{
tool_manager_register_tool (gimp,
GIMP_TYPE_FUZZY_SELECT_TOOL,
FALSE,
"gimp:fuzzy_select_tool",
_("Fuzzy Select"),
_("Select contiguous regions"),
_("/Tools/Selection Tools/Fuzzy Select"), "Z",
NULL, "tools/fuzzy_select.html",
GIMP_STOCK_TOOL_FUZZY_SELECT);
}
GType
gimp_fuzzy_select_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpFuzzySelectToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_fuzzy_select_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpFuzzySelectTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_fuzzy_select_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_SELECTION_TOOL,
"GimpFuzzySelectTool",
&tool_info, 0);
}
return tool_type;
}
/*******************************/
/* 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);
}
}
GimpChannel *
find_contiguous_region (GimpImage *gimage,
GimpDrawable *drawable,
gboolean antialias,
gint threshold,
gint x,
gint y,
gboolean sample_merged)
{
PixelRegion srcPR, maskPR;
GimpChannel *mask;
guchar *start;
gboolean has_alpha;
gboolean indexed;
gint type;
gint bytes;
Tile *tile;
if (sample_merged)
{
pixel_region_init (&srcPR, gimp_image_composite (gimage), 0, 0,
gimage->width, gimage->height, FALSE);
type = gimp_image_composite_type (gimage);
has_alpha = (type == RGBA_GIMAGE ||
type == GRAYA_GIMAGE ||
type == INDEXEDA_GIMAGE);
}
else
{
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
0, 0,
gimp_drawable_width (drawable),
gimp_drawable_height (drawable),
FALSE);
has_alpha = gimp_drawable_has_alpha (drawable);
}
indexed = gimp_drawable_is_indexed (drawable);
bytes = gimp_drawable_bytes (drawable);
if (indexed)
{
bytes = has_alpha ? 4 : 3;
}
mask = gimp_channel_new_mask (gimage, srcPR.w, srcPR.h);
pixel_region_init (&maskPR, gimp_drawable_data (GIMP_DRAWABLE(mask)),
0, 0,
gimp_drawable_width (GIMP_DRAWABLE(mask)),
gimp_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 (GimpImage *gimage,
GimpDrawable *drawable,
gint op,
gboolean feather,
gdouble feather_radius)
{
gint off_x, off_y;
/* if applicable, replace the current selection */
if (op == CHANNEL_OP_REPLACE)
gimage_mask_clear (gimage);
else
gimage_mask_undo (gimage);
if (drawable) /* NULL if sample_merged is active */
gimp_drawable_offsets (drawable, &off_x, &off_y);
else
off_x = off_y = 0;
if (feather)
gimp_channel_feather (fuzzy_mask, gimp_image_get_mask (gimage),
feather_radius,
feather_radius,
op, off_x, off_y);
else
gimp_channel_combine_mask (gimp_image_get_mask (gimage),
fuzzy_mask, op, off_x, off_y);
g_object_unref (G_OBJECT (fuzzy_mask));
fuzzy_mask = NULL;
}
/* fuzzy select action functions */
static void
gimp_fuzzy_select_tool_class_init (GimpFuzzySelectToolClass *klass)
{
GimpToolClass *tool_class;
GimpDrawToolClass *draw_tool_class;
tool_class = GIMP_TOOL_CLASS (klass);
draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
tool_class->button_press = gimp_fuzzy_select_tool_button_press;
tool_class->button_release = gimp_fuzzy_select_tool_button_release;
tool_class->motion = gimp_fuzzy_select_tool_motion;
draw_tool_class->draw = gimp_fuzzy_select_tool_draw;
}
static void
gimp_fuzzy_select_tool_init (GimpFuzzySelectTool *fuzzy_select)
{
GimpTool *tool;
GimpSelectionTool *select_tool;
tool = GIMP_TOOL (fuzzy_select);
select_tool = GIMP_SELECTION_TOOL (fuzzy_select);
if (! fuzzy_options)
{
fuzzy_options = selection_options_new (GIMP_TYPE_FUZZY_SELECT_TOOL,
selection_options_reset);
tool_manager_register_tool_options (GIMP_TYPE_FUZZY_SELECT_TOOL,
(GimpToolOptions *) fuzzy_options);
}
tool->tool_cursor = GIMP_FUZZY_SELECT_TOOL_CURSOR;
tool->scroll_lock = TRUE; /* Do not allow scrolling */
fuzzy_select->x = 0;
fuzzy_select->y = 0;
fuzzy_select->first_x = 0;
fuzzy_select->first_y = 0;
fuzzy_select->first_threshold = 0.0;
}
static void
gimp_fuzzy_select_tool_button_press (GimpTool *tool,
GdkEventButton *bevent,
GDisplay *gdisp)
{
GimpFuzzySelectTool *fuzzy_sel;
fuzzy_sel = GIMP_FUZZY_SELECT_TOOL (tool);
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 = gdisp;
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;
switch (GIMP_SELECTION_TOOL (tool)->op)
{
case SELECTION_MOVE_MASK:
init_edit_selection (tool, gdisp, bevent, EDIT_MASK_TRANSLATE);
return;
case SELECTION_MOVE:
init_edit_selection (tool, gdisp, bevent, EDIT_MASK_TO_LAYER_TRANSLATE);
return;
default:
break;
}
/* calculate the region boundary */
segs = fuzzy_select_calculate (fuzzy_sel, gdisp, &num_segs);
gimp_draw_tool_start (GIMP_DRAW_TOOL (tool),
gdisp->canvas->window);
}
static void
gimp_fuzzy_select_tool_button_release (GimpTool *tool,
GdkEventButton *bevent,
GDisplay *gdisp)
{
GimpFuzzySelectTool *fuzzy_sel;
GimpDrawable *drawable;
fuzzy_sel = GIMP_FUZZY_SELECT_TOOL (tool);
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
gimp_draw_tool_stop (GIMP_DRAW_TOOL (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 : gimp_image_active_drawable (gdisp->gimage));
fuzzy_select (gdisp->gimage,
drawable,
GIMP_SELECTION_TOOL (tool)->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
gimp_fuzzy_select_tool_motion (GimpTool *tool,
GdkEventMotion *mevent,
GDisplay *gdisp)
{
GimpFuzzySelectTool *fuzzy_sel;
GimpSelectionTool *sel_tool;
GdkSegment *new_segs;
gint num_new_segs;
gint diff_x, diff_y;
gdouble diff;
static guint last_time = 0;
fuzzy_sel = GIMP_FUZZY_SELECT_TOOL (tool);
sel_tool = GIMP_SELECTION_TOOL (tool);
/* needed for immediate cursor update on modifier event */
sel_tool->current_x = mevent->x;
sel_tool->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 (fuzzy_sel, gdisp, &num_new_segs);
/* stop the current boundary */
gimp_draw_tool_pause (GIMP_DRAW_TOOL (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 */
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
static GdkSegment *
fuzzy_select_calculate (GimpFuzzySelectTool *fuzzy_sel,
GDisplay *gdisp,
gint *nsegs)
{
PixelRegion maskPR;
GimpChannel *new;
GdkSegment *segs;
BoundSeg *bsegs;
GimpDrawable *drawable;
gint i;
gint x, y;
gboolean use_offsets;
drawable = gimp_image_active_drawable (gdisp->gimage);
gimp_set_busy (gdisp->gimage->gimp);
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)
g_object_unref (G_OBJECT (fuzzy_mask));
fuzzy_mask = new;
/* calculate and allocate a new XSegment array which represents the boundary
* of the color-contiguous region
*/
pixel_region_init (&maskPR, gimp_drawable_data (GIMP_DRAWABLE (fuzzy_mask)),
0, 0,
gimp_drawable_width (GIMP_DRAWABLE (fuzzy_mask)),
gimp_drawable_height (GIMP_DRAWABLE (fuzzy_mask)),
FALSE);
bsegs = find_mask_boundary (&maskPR, nsegs, WithinBounds,
0, 0,
gimp_drawable_width (GIMP_DRAWABLE (fuzzy_mask)),
gimp_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_unset_busy (gdisp->gimage->gimp);
return segs;
}
static void
gimp_fuzzy_select_tool_draw (GimpDrawTool *draw_tool)
{
GimpFuzzySelectTool *fuzzy_sel;
fuzzy_sel = GIMP_FUZZY_SELECT_TOOL (draw_tool);
if (segs)
gdk_draw_segments (draw_tool->win,
draw_tool->gc,
segs, num_segs);
}
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