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gimp/app/display/gimpdisplayshell-selection.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 <gtk/gtk.h>
#include "display-types.h"
#include "config/gimpdisplayconfig.h"
#include "base/boundary.h"
#include "core/gimp.h"
#include "core/gimpchannel.h"
#include "core/gimpimage.h"
#include "gimpcanvas.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-appearance.h"
#include "gimpdisplayshell-selection.h"
#include "gimpdisplayshell-transform.h"
#define USE_DRAWPOINTS
#undef VERBOSE
/* The possible internal drawing states... */
#define INVISIBLE 0
#define INTRO 1
#define MARCHING 2
#define INITIAL_DELAY 15 /* in milleseconds */
/* local function prototypes */
static void selection_add_point (GdkPoint *points[8],
gint max_npoints[8],
gint npoints[8],
gint x,
gint y);
static void selection_render_points (Selection *select);
static void selection_draw (Selection *select);
static void selection_transform_segs (Selection *select,
const BoundSeg *src_segs,
GdkSegment *dest_segs,
gint num_segs);
static void selection_generate_segs (Selection *select);
static void selection_free_segs (Selection *select);
static gboolean selection_start_marching (gpointer data);
static gboolean selection_march_ants (gpointer data);
/* public functions */
Selection *
gimp_display_shell_selection_new (GimpDisplayShell *shell)
{
Selection *new;
gint i;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
new = g_new0 (Selection, 1);
new->shell = shell;
new->state = INVISIBLE;
new->recalc = TRUE;
new->hidden = ! gimp_display_shell_get_show_selection (shell);
new->layer_hidden = ! gimp_display_shell_get_show_layer (shell);
for (i = 0; i < 8; i++)
new->points_in[i] = NULL;
return new;
}
void
gimp_display_shell_selection_free (Selection *select)
{
if (select->timeout_id)
g_source_remove (select->timeout_id);
selection_free_segs (select);
g_free (select);
}
void
gimp_display_shell_selection_pause (Selection *select)
{
if (select->timeout_id)
{
g_source_remove (select->timeout_id);
select->timeout_id = 0;
}
select->state = INVISIBLE;
select->paused++;
}
void
gimp_display_shell_selection_resume (Selection *select)
{
if (select->paused == 1)
{
select->state = INTRO;
select->timeout_id = g_timeout_add (INITIAL_DELAY,
selection_start_marching,
select);
}
select->paused--;
}
void
gimp_display_shell_selection_start (Selection *select,
gboolean recalc)
{
/* A call to selection_start with recalc == TRUE means that
* we want to recalculate the selection boundary--usually
* after scaling or panning the display, or modifying the
* selection in some way. If recalc == FALSE, the already
* calculated boundary is simply redrawn.
*/
if (recalc)
select->recalc = TRUE;
/* If this selection is paused, do not start it */
if (select->paused > 0)
return;
select->state = INTRO; /* The state before the first draw */
if (select->timeout_id)
g_source_remove (select->timeout_id);
select->timeout_id = g_timeout_add (INITIAL_DELAY,
selection_start_marching,
select);
}
void
gimp_display_shell_selection_invis (Selection *select)
{
gint x1, y1, x2, y2;
if (select->timeout_id)
{
g_source_remove (select->timeout_id);
select->timeout_id = 0;
}
select->state = INVISIBLE;
/* Find the bounds of the selection */
if (gimp_display_shell_mask_bounds (select->shell, &x1, &y1, &x2, &y2))
{
gimp_display_shell_expose_area (select->shell,
x1, y1, (x2 - x1), (y2 - y1));
}
else
{
gimp_display_shell_selection_start (select, TRUE);
}
}
void
gimp_display_shell_selection_layer_invis (Selection *select)
{
gint x1, y1;
gint x2, y2;
gint x3, y3;
gint x4, y4;
if (select->timeout_id)
{
g_source_remove (select->timeout_id);
select->timeout_id = 0;
}
select->state = INVISIBLE;
if (select->segs_layer != NULL && select->num_segs_layer == 4)
{
x1 = select->segs_layer[0].x1 - 1;
y1 = select->segs_layer[0].y1 - 1;
x2 = select->segs_layer[3].x2 + 1;
y2 = select->segs_layer[3].y2 + 1;
x3 = select->segs_layer[0].x1 + 1;
y3 = select->segs_layer[0].y1 + 1;
x4 = select->segs_layer[3].x2 - 1;
y4 = select->segs_layer[3].y2 - 1;
/* expose the region */
gimp_display_shell_expose_area (select->shell,
x1, y1,
(x2 - x1) + 1, (y3 - y1) + 1);
gimp_display_shell_expose_area (select->shell,
x1, y3,
(x3 - x1) + 1, (y4 - y3) + 1);
gimp_display_shell_expose_area (select->shell,
x1, y4,
(x2 - x1) + 1, (y2 - y4) + 1);
gimp_display_shell_expose_area (select->shell,
x4, y3,
(x2 - x4) + 1, (y4 - y3) + 1);
}
}
void
gimp_display_shell_selection_set_hidden (Selection *select,
gboolean hidden)
{
if (hidden != select->hidden)
{
gimp_display_shell_selection_invis (select);
gimp_display_shell_selection_layer_invis (select);
select->hidden = hidden;
gimp_display_shell_selection_start (select, TRUE);
}
}
void
gimp_display_shell_selection_layer_set_hidden (Selection *select,
gboolean hidden)
{
if (hidden != select->layer_hidden)
{
gimp_display_shell_selection_invis (select);
gimp_display_shell_selection_layer_invis (select);
select->layer_hidden = hidden;
gimp_display_shell_selection_start (select, TRUE);
}
}
/* private functions */
#define MAX_POINTS_INC 2048
static void
selection_add_point (GdkPoint *points[8],
gint max_npoints[8],
gint npoints[8],
gint x,
gint y)
{
gint i, j;
j = (x - y) & 7;
i = npoints[j]++;
if (i == max_npoints[j])
{
max_npoints[j] += 2048;
points[j] = g_realloc (points[j], sizeof (GdkPoint) * max_npoints[j]);
}
points[j][i].x = x;
points[j][i].y = y;
}
/* Render the segs_in array into points_in */
static void
selection_render_points (Selection *select)
{
gint i, j;
gint max_npoints[8];
gint x, y;
gint dx, dy;
gint dxa, dya;
gint r;
if (select->segs_in == NULL)
return;
for (j = 0; j < 8; j++)
{
max_npoints[j] = MAX_POINTS_INC;
select->points_in[j] = g_new (GdkPoint, max_npoints[j]);
select->num_points_in[j] = 0;
}
for (i = 0; i < select->num_segs_in; i++)
{
#ifdef VERBOSE
g_print ("%2d: (%d, %d) - (%d, %d)\n", i,
select->segs_in[i].x1,
select->segs_in[i].y1,
select->segs_in[i].x2,
select->segs_in[i].y2);
#endif
x = select->segs_in[i].x1;
dxa = select->segs_in[i].x2 - x;
if (dxa > 0)
{
dx = 1;
}
else
{
dxa = -dxa;
dx = -1;
}
y = select->segs_in[i].y1;
dya = select->segs_in[i].y2 - y;
if (dya > 0)
{
dy = 1;
}
else
{
dya = -dya;
dy = -1;
}
if (dxa > dya)
{
r = dya;
do {
selection_add_point (select->points_in,
max_npoints,
select->num_points_in,
x, y);
x += dx;
r += dya;
if (r >= (dxa << 1))
{
y += dy;
r -= (dxa << 1);
}
} while (x != select->segs_in[i].x2);
}
else if (dxa < dya)
{
r = dxa;
do {
selection_add_point (select->points_in,
max_npoints,
select->num_points_in,
x, y);
y += dy;
r += dxa;
if (r >= (dya << 1))
{
x += dx;
r -= (dya << 1);
}
} while (y != select->segs_in[i].y2);
}
else
{
selection_add_point (select->points_in,
max_npoints,
select->num_points_in,
x, y);
}
}
}
static void
selection_draw (Selection *select)
{
GimpCanvas *canvas = GIMP_CANVAS (select->shell->canvas);
if (select->hidden)
return;
#ifdef USE_DRAWPOINTS
#ifdef VERBOSE
{
gint j, sum;
sum = 0;
for (j = 0; j < 8; j++)
sum += select->num_points_in[j];
g_print ("%d segments, %d points\n", select->num_segs_in, sum);
}
#endif
if (select->segs_in)
{
gint i;
if (select->index == 0)
{
for (i = 0; i < 4; i++)
if (select->num_points_in[i])
gimp_canvas_draw_points (canvas, GIMP_CANVAS_STYLE_WHITE,
select->points_in[i],
select->num_points_in[i]);
for (i = 4; i < 8; i++)
if (select->num_points_in[i])
gimp_canvas_draw_points (canvas, GIMP_CANVAS_STYLE_BLACK,
select->points_in[i],
select->num_points_in[i]);
}
else
{
i = ((select->index + 3) & 7);
if (select->num_points_in[i])
gimp_canvas_draw_points (canvas, GIMP_CANVAS_STYLE_WHITE,
select->points_in[i],
select->num_points_in[i]);
i = ((select->index + 7) & 7);
if (select->num_points_in[i])
gimp_canvas_draw_points (canvas, GIMP_CANVAS_STYLE_BLACK,
select->points_in[i],
select->num_points_in[i]);
}
}
#else /* ! USE_DRAWPOINTS */
gimp_canvas_set_stipple_index (canvas,
GIMP_CANVAS_STYLE_SELECTION_IN,
select->index);
if (select->segs_in)
gimp_canvas_draw_segments (canvas, GIMP_CANVAS_STYLE_SELECTION_IN,
select->segs_in, select->num_segs_in);
#endif
}
static void
selection_transform_segs (Selection *select,
const BoundSeg *src_segs,
GdkSegment *dest_segs,
gint num_segs)
{
gint x, y;
gint i;
gint xclamp, yclamp;
xclamp = select->shell->disp_width + 1;
yclamp = select->shell->disp_height + 1;
for (i = 0; i < num_segs; i++)
{
gimp_display_shell_transform_xy (select->shell,
src_segs[i].x1, src_segs[i].y1,
&x, &y,
FALSE);
dest_segs[i].x1 = CLAMP (x, -1, xclamp);
dest_segs[i].y1 = CLAMP (y, -1, yclamp);
gimp_display_shell_transform_xy (select->shell,
src_segs[i].x2, src_segs[i].y2,
&x, &y,
FALSE);
dest_segs[i].x2 = CLAMP (x, -1, xclamp);
dest_segs[i].y2 = CLAMP (y, -1, yclamp);
/* If this segment is a closing segment && the segments lie inside
* the region, OR if this is an opening segment and the segments
* lie outside the region...
* we need to transform it by one display pixel
*/
if (!src_segs[i].open)
{
/* If it is vertical */
if (dest_segs[i].x1 == dest_segs[i].x2)
{
dest_segs[i].x1 -= 1;
dest_segs[i].x2 -= 1;
}
else
{
dest_segs[i].y1 -= 1;
dest_segs[i].y2 -= 1;
}
}
}
}
static void
selection_generate_segs (Selection *select)
{
const BoundSeg *segs_in;
const BoundSeg *segs_out;
BoundSeg *segs_layer;
/* Ask the gimage for the boundary of its selected region...
* Then transform that information into a new buffer of GdkSegments
*/
gimp_channel_boundary (gimp_image_get_mask (select->shell->gdisp->gimage),
&segs_in, &segs_out,
&select->num_segs_in, &select->num_segs_out,
0, 0, 0, 0);
if (select->num_segs_in)
{
select->segs_in = g_new (GdkSegment, select->num_segs_in);
selection_transform_segs (select, segs_in, select->segs_in,
select->num_segs_in);
#ifdef USE_DRAWPOINTS
selection_render_points (select);
#endif
}
else
{
select->segs_in = NULL;
}
/* Possible secondary boundary representation */
if (select->num_segs_out)
{
select->segs_out = g_new (GdkSegment, select->num_segs_out);
selection_transform_segs (select, segs_out, select->segs_out,
select->num_segs_out);
}
else
{
select->segs_out = NULL;
}
/* The active layer's boundary */
gimp_image_layer_boundary (select->shell->gdisp->gimage,
&segs_layer,
&select->num_segs_layer);
if (select->num_segs_layer)
{
select->segs_layer = g_new (GdkSegment, select->num_segs_layer);
selection_transform_segs (select, segs_layer, select->segs_layer,
select->num_segs_layer);
}
else
{
select->segs_layer = NULL;
}
g_free (segs_layer);
}
static void
selection_free_segs (Selection *select)
{
gint j;
if (select->segs_in)
g_free (select->segs_in);
if (select->segs_out)
g_free (select->segs_out);
if (select->segs_layer)
g_free (select->segs_layer);
for (j = 0; j < 8; j++)
{
if (select->points_in[j])
g_free (select->points_in[j]);
select->points_in[j] = NULL;
select->num_points_in[j] = 0;
}
select->segs_in = NULL;
select->num_segs_in = 0;
select->segs_out = NULL;
select->num_segs_out = 0;
select->segs_layer = NULL;
select->num_segs_layer = 0;
}
static gboolean
selection_start_marching (gpointer data)
{
Selection *select = (Selection *) data;
GimpCanvas *canvas;
GimpDisplayConfig *config;
canvas = GIMP_CANVAS (select->shell->canvas);
config = GIMP_DISPLAY_CONFIG (select->shell->gdisp->gimage->gimp->config);
/* if the RECALC bit is set, reprocess the boundaries */
if (select->recalc)
{
selection_free_segs (select);
selection_generate_segs (select);
/* Toggle the RECALC flag */
select->recalc = FALSE;
}
select->index = 0;
/* Make sure the state is set to marching */
select->state = MARCHING;
if (! select->layer_hidden && select->segs_layer)
gimp_canvas_draw_segments (canvas, GIMP_CANVAS_STYLE_LAYER_BOUNDARY,
select->segs_layer, select->num_segs_layer);
/* Draw the ants */
if (! select->hidden)
{
selection_draw (select);
if (select->segs_out)
gimp_canvas_draw_segments (canvas, GIMP_CANVAS_STYLE_SELECTION_OUT,
select->segs_out, select->num_segs_out);
}
/* Reset the timer */
select->timeout_id = g_timeout_add (config->marching_ants_speed,
selection_march_ants,
select);
return FALSE;
}
static gboolean
selection_march_ants (gpointer data)
{
Selection *select = (Selection *) data;
select->index++;
selection_draw (select);
return TRUE;
}
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