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gimp/app/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 "apptypes.h"
#include "boundary.h"
#include "colormaps.h"
#include "gdisplay.h"
#include "gdisplay_ops.h"
#include "gimage_mask.h"
#include "gimpimage.h"
#include "gimprc.h"
#include "selection.h"
#include "marching_ants.h"
#define USE_XDRAWPOINTS
#undef VERBOSE
/* The possible internal drawing states... */
#define INVISIBLE 0
#define INTRO 1
#define MARCHING 2
#define INITIAL_DELAY 15 /* in milleseconds */
/* static function prototypes */
static GdkPixmap * create_cycled_ants_pixmap (GdkWindow *window,
gint depth);
static void cycle_ant_colors (Selection *);
static void selection_draw (Selection *);
static void selection_transform_segs (Selection *,
BoundSeg *,
GdkSegment *,
gint );
static void selection_generate_segs (Selection *);
static void selection_free_segs (Selection *);
static gint selection_march_ants (gpointer );
static gint selection_start_marching (gpointer );
GdkPixmap * marching_ants[9] = { NULL };
GdkPixmap * cycled_ants_pixmap = NULL;
/*********************************/
/* Local function definitions */
/*********************************/
static GdkPixmap *
create_cycled_ants_pixmap (GdkWindow *window,
gint depth)
{
GdkPixmap *pixmap;
GdkGC *gc;
GdkColor col;
gint i, j;
pixmap = gdk_pixmap_new (window, 8, 8, depth);
gc = gdk_gc_new (window);
for (i = 0; i < 8; i++)
for (j = 0; j < 8; j++)
{
col.pixel = marching_ants_pixels[((i + j) % 8)];
gdk_gc_set_foreground (gc, &col);
gdk_draw_line (pixmap, gc, i, j, i, j);
}
gdk_gc_destroy (gc);
return pixmap;
}
static void
cycle_ant_colors (Selection *select)
{
gint i;
gint index;
for (i = 0; i < 8; i++)
{
index = (i + (8 - select->index_in)) % 8;
if (index < 4)
marching_ants_pixels[i] = get_color (0, 0, 0);
else
marching_ants_pixels[i] = get_color (255, 255, 255);
}
}
#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)
{
if (select->hidden)
return;
if (select->segs_layer && select->index_layer == 0)
gdk_draw_segments (select->win, select->gc_layer,
select->segs_layer, select->num_segs_layer);
#ifdef USE_XDRAWPOINTS
#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_in == 0)
{
for (i = 0; i < 4; i++)
if (select->num_points_in[i])
gdk_draw_points (select->win, select->gc_white,
select->points_in[i], select->num_points_in[i]);
for (i = 4; i < 8; i++)
if (select->num_points_in[i])
gdk_draw_points (select->win, select->gc_black,
select->points_in[i], select->num_points_in[i]);
}
else
{
i = ((select->index_in + 3) & 7);
if (select->num_points_in[i])
gdk_draw_points (select->win, select->gc_white,
select->points_in[i], select->num_points_in[i]);
i = ((select->index_in + 7) & 7);
if (select->num_points_in[i])
gdk_draw_points (select->win, select->gc_black,
select->points_in[i], select->num_points_in[i]);
}
}
#else
if (select->segs_in)
gdk_draw_segments (select->win, select->gc_in,
select->segs_in, select->num_segs_in);
#endif
if (select->segs_out && select->index_out == 0)
gdk_draw_segments (select->win, select->gc_out,
select->segs_out, select->num_segs_out);
}
static void
selection_transform_segs (Selection *select,
BoundSeg *src_segs,
GdkSegment *dest_segs,
int num_segs)
{
GDisplay * gdisp;
int x, y;
int i;
gdisp = (GDisplay *) select->gdisp;
for (i = 0; i < num_segs; i++)
{
gdisplay_transform_coords (gdisp, src_segs[i].x1, src_segs[i].y1,
&x, &y, 0);
dest_segs[i].x1 = x;
dest_segs[i].y1 = y;
gdisplay_transform_coords (gdisp, src_segs[i].x2, src_segs[i].y2,
&x, &y, 0);
dest_segs[i].x2 = x;
dest_segs[i].y2 = y;
/* 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)
{
GDisplay * gdisp;
BoundSeg *segs_in;
BoundSeg *segs_out;
BoundSeg *segs_layer;
gdisp = (GDisplay *) select->gdisp;
/* Ask the gimage for the boundary of its selected region...
* Then transform that information into a new buffer of XSegments
*/
gimage_mask_boundary (gdisp->gimage, &segs_in, &segs_out,
&select->num_segs_in, &select->num_segs_out);
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_XDRAWPOINTS
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 (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 gint
selection_start_marching (gpointer data)
{
Selection * select;
select = (Selection *) data;
/* 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_in = 0;
select->index_out = 0;
select->index_layer = 0;
/* Make sure the state is set to marching */
select->state = MARCHING;
/* Draw the ants */
if (select->cycle)
cycle_ant_colors (select);
else
{
gdk_gc_set_stipple (select->gc_in, marching_ants[select->index_in]);
gdk_gc_set_stipple (select->gc_out, marching_ants[select->index_out]);
gdk_gc_set_stipple (select->gc_layer, marching_ants[select->index_layer]);
}
selection_draw (select);
/* Reset the timer */
select->timer = gtk_timeout_add (select->speed,
selection_march_ants,
(gpointer) select);
return FALSE;
}
static gint
selection_march_ants (gpointer data)
{
Selection * select;
select = (Selection *) data;
/* increment stipple index */
select->index_in++;
#ifndef USE_XDRAWPOINTS
if (select->index_in > 7)
select->index_in = 0;
#endif
/* outside segments do not march, so index does not cycle */
select->index_out++;
/* layer doesn't march */
select->index_layer++;
/* Draw the ants */
if (select->cycle)
cycle_ant_colors (select);
else
{
#ifndef USE_XDRAWPOINTS
gdk_gc_set_stipple (select->gc_in, marching_ants[select->index_in]);
#endif
selection_draw (select);
}
return TRUE;
}
/*********************************/
/* Public function definitions */
/*********************************/
Selection *
selection_create (GdkWindow *win,
GDisplay *gdisp,
gint size,
gint width,
gint speed)
{
GdkColor fg, bg;
Selection *new;
gint base_type;
gint i;
new = g_new (Selection, 1);
base_type = gimp_image_base_type (gdisp->gimage);
if (cycled_marching_ants)
{
new->cycle = TRUE;
if (!cycled_ants_pixmap)
cycled_ants_pixmap = create_cycled_ants_pixmap (win, gdisp->depth);
new->cycle_pix = cycled_ants_pixmap;
}
else
{
new->cycle = FALSE;
if (!marching_ants[0])
for (i = 0; i < 8; i++)
marching_ants[i] = gdk_bitmap_create_from_data (win, (char*) ant_data[i], 8, 8);
}
new->win = win;
new->gdisp = gdisp;
new->segs_in = NULL;
new->segs_out = NULL;
new->segs_layer = NULL;
new->num_segs_in = 0;
new->num_segs_out = 0;
new->num_segs_layer = 0;
new->index_in = 0;
new->index_out = 0;
new->index_layer = 0;
new->state = INVISIBLE;
new->paused = 0;
new->recalc = TRUE;
new->speed = speed;
new->hidden = FALSE;
for (i = 0; i < 8; i++)
new->points_in[i] = NULL;
/* create a new graphics context */
new->gc_in = gdk_gc_new (new->win);
if (new->cycle)
{
gdk_gc_set_fill (new->gc_in, GDK_TILED);
gdk_gc_set_tile (new->gc_in, new->cycle_pix);
gdk_gc_set_line_attributes (new->gc_in, 1, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
}
else
{
/* get black and white pixels for this gdisplay */
fg.pixel = gdisplay_black_pixel (gdisp);
bg.pixel = gdisplay_white_pixel (gdisp);
gdk_gc_set_foreground (new->gc_in, &fg);
gdk_gc_set_background (new->gc_in, &bg);
gdk_gc_set_fill (new->gc_in, GDK_OPAQUE_STIPPLED);
gdk_gc_set_line_attributes (new->gc_in, 1, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
}
#ifdef USE_XDRAWPOINTS
new->gc_white = gdk_gc_new (new->win);
gdk_gc_set_foreground (new->gc_white, &bg);
new->gc_black = gdk_gc_new (new->win);
gdk_gc_set_foreground (new->gc_black, &fg);
#endif
/* Setup 2nd & 3rd GCs */
fg.pixel = gdisplay_white_pixel (gdisp);
bg.pixel = gdisplay_gray_pixel (gdisp);
/* create a new graphics context */
new->gc_out = gdk_gc_new (new->win);
gdk_gc_set_foreground (new->gc_out, &fg);
gdk_gc_set_background (new->gc_out, &bg);
gdk_gc_set_fill (new->gc_out, GDK_OPAQUE_STIPPLED);
gdk_gc_set_line_attributes (new->gc_out, 1, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
/* get black and color pixels for this gdisplay */
fg.pixel = gdisplay_black_pixel (gdisp);
bg.pixel = gdisplay_color_pixel (gdisp);
/* create a new graphics context */
new->gc_layer = gdk_gc_new (new->win);
gdk_gc_set_foreground (new->gc_layer, &fg);
gdk_gc_set_background (new->gc_layer, &bg);
gdk_gc_set_fill (new->gc_layer, GDK_OPAQUE_STIPPLED);
gdk_gc_set_line_attributes (new->gc_layer, 1, GDK_LINE_SOLID, GDK_CAP_BUTT, GDK_JOIN_MITER);
return new;
}
void
selection_pause (Selection *select)
{
if (select->state != INVISIBLE)
gtk_timeout_remove (select->timer);
select->paused ++;
}
void
selection_resume (Selection *select)
{
if (select->paused == 1)
{
select->state = INTRO;
select->timer = gtk_timeout_add (INITIAL_DELAY, selection_start_marching,
(gpointer) select);
}
select->paused--;
}
void
selection_start (Selection *select,
int 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;
if (select->state != INVISIBLE)
gtk_timeout_remove (select->timer);
select->state = INTRO; /* The state before the first draw */
select->timer = gtk_timeout_add (INITIAL_DELAY, selection_start_marching,
(gpointer) select);
}
void
selection_invis (Selection *select)
{
GDisplay * gdisp;
int x1, y1, x2, y2;
if (select->state != INVISIBLE)
{
gtk_timeout_remove (select->timer);
select->state = INVISIBLE;
}
gdisp = (GDisplay *) select->gdisp;
/* Find the bounds of the selection */
if (gdisplay_mask_bounds (gdisp, &x1, &y1, &x2, &y2))
{
gdisplay_expose_area (gdisp, x1, y1, (x2 - x1), (y2 - y1));
}
else
{
selection_start (select, TRUE);
}
}
void
selection_layer_invis (Selection *select)
{
GDisplay * gdisp;
int x1, y1, x2, y2;
int x3, y3, x4, y4;
if (select->state != INVISIBLE)
{
gtk_timeout_remove (select->timer);
select->state = INVISIBLE;
}
gdisp = (GDisplay *) select->gdisp;
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 */
gdisplay_expose_area (gdisp, x1, y1, (x2 - x1) + 1, (y3 - y1) + 1);
gdisplay_expose_area (gdisp, x1, y3, (x3 - x1) + 1, (y4 - y3) + 1);
gdisplay_expose_area (gdisp, x1, y4, (x2 - x1) + 1, (y2 - y4) + 1);
gdisplay_expose_area (gdisp, x4, y3, (x2 - x4) + 1, (y4 - y3) + 1);
}
}
void
selection_hide (Selection *select,
GDisplay *gdisp)
{
selection_invis (select);
selection_layer_invis (select);
/* toggle the visibility */
select->hidden = select->hidden ? FALSE : TRUE;
selection_start (select, TRUE);
}
void
selection_free (Selection *select)
{
if (select->state != INVISIBLE)
gtk_timeout_remove (select->timer);
if (select->gc_in)
gdk_gc_destroy (select->gc_in);
if (select->gc_out)
gdk_gc_destroy (select->gc_out);
if (select->gc_layer)
gdk_gc_destroy (select->gc_layer);
#ifdef USE_XDRAWPOINTS
if (select->gc_white)
gdk_gc_destroy (select->gc_white);
if (select->gc_black)
gdk_gc_destroy (select->gc_black);
#endif
selection_free_segs (select);
g_free (select);
}
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