gimp/app/vectors/gimpvectors-compat.c

281 lines
7.4 KiB
C

/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpvectors-compat.c
* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include "vectors-types.h"
#include "core/gimpimage.h"
#include "gimpanchor.h"
#include "gimpbezierstroke.h"
#include "gimpvectors.h"
#include "gimpvectors-compat.h"
enum
{
GIMP_VECTORS_COMPAT_ANCHOR = 1,
GIMP_VECTORS_COMPAT_CONTROL = 2,
GIMP_VECTORS_COMPAT_NEW_STROKE = 3
};
static const GimpCoords default_coords = GIMP_COORDS_DEFAULT_VALUES;
GimpVectors *
gimp_vectors_compat_new (GimpImage *image,
const gchar *name,
GimpVectorsCompatPoint *points,
gint n_points,
gboolean closed)
{
GimpVectors *vectors;
GimpStroke *stroke;
GimpCoords *coords;
GimpCoords *curr_stroke;
GimpCoords *curr_coord;
gint i;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (points != NULL || n_points == 0, NULL);
g_return_val_if_fail (n_points >= 0, NULL);
vectors = gimp_vectors_new (image, name);
coords = g_new0 (GimpCoords, n_points + 1);
curr_stroke = curr_coord = coords;
/* skip the first control point, will set it later */
curr_coord++;
for (i = 0; i < n_points; i++)
{
*curr_coord = default_coords;
curr_coord->x = points[i].x;
curr_coord->y = points[i].y;
/* copy the first anchor to be the first control point */
if (curr_coord == curr_stroke + 1)
*curr_stroke = *curr_coord;
/* found new stroke start */
if (points[i].type == GIMP_VECTORS_COMPAT_NEW_STROKE)
{
/* copy the last control point to the beginning of the stroke */
*curr_stroke = *(curr_coord - 1);
stroke =
gimp_bezier_stroke_new_from_coords (curr_stroke,
curr_coord - curr_stroke - 1,
TRUE);
gimp_vectors_stroke_add (vectors, stroke);
g_object_unref (stroke);
/* start a new stroke */
curr_stroke = curr_coord - 1;
/* copy the first anchor to be the first control point */
*curr_stroke = *curr_coord;
}
curr_coord++;
}
if (closed)
{
/* copy the last control point to the beginning of the stroke */
curr_coord--;
*curr_stroke = *curr_coord;
}
stroke = gimp_bezier_stroke_new_from_coords (curr_stroke,
curr_coord - curr_stroke,
closed);
gimp_vectors_stroke_add (vectors, stroke);
g_object_unref (stroke);
g_free (coords);
return vectors;
}
gboolean
gimp_vectors_compat_is_compatible (GimpImage *image)
{
GList *list;
g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
for (list = gimp_image_get_vectors_iter (image);
list;
list = g_list_next (list))
{
GimpVectors *vectors = GIMP_VECTORS (list->data);
GList *strokes;
gint open_count = 0;
if (gimp_item_get_visible (GIMP_ITEM (vectors)))
return FALSE;
for (strokes = vectors->strokes; strokes; strokes = g_list_next (strokes))
{
GimpStroke *stroke = GIMP_STROKE (strokes->data);
if (! GIMP_IS_BEZIER_STROKE (stroke))
return FALSE;
if (!stroke->closed)
open_count++;
}
if (open_count >= 2)
return FALSE;
}
return TRUE;
}
GimpVectorsCompatPoint *
gimp_vectors_compat_get_points (GimpVectors *vectors,
gint32 *n_points,
gint32 *closed)
{
GimpVectorsCompatPoint *points;
GList *strokes;
gint i;
GList *postponed = NULL; /* for the one open stroke... */
gint open_count;
gboolean first_stroke = TRUE;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
g_return_val_if_fail (n_points != NULL, NULL);
g_return_val_if_fail (closed != NULL, NULL);
*n_points = 0;
*closed = TRUE;
open_count = 0;
for (strokes = vectors->strokes; strokes; strokes = g_list_next (strokes))
{
GimpStroke *stroke = strokes->data;
gint n_anchors;
if (! stroke->closed)
{
open_count++;
postponed = strokes;
*closed = FALSE;
if (open_count >= 2)
{
g_warning ("gimp_vectors_compat_get_points(): convert failed");
*n_points = 0;
return NULL;
}
}
n_anchors = g_list_length (stroke->anchors);
if (! stroke->closed)
n_anchors--;
*n_points += n_anchors;
}
points = g_new0 (GimpVectorsCompatPoint, *n_points);
i = 0;
for (strokes = vectors->strokes;
strokes || postponed;
strokes = g_list_next (strokes))
{
GimpStroke *stroke;
GList *anchors;
if (strokes)
{
if (postponed && strokes == postponed)
/* we need to visit the open stroke last... */
continue;
else
stroke = GIMP_STROKE (strokes->data);
}
else
{
stroke = GIMP_STROKE (postponed->data);
postponed = NULL;
}
for (anchors = stroke->anchors;
anchors;
anchors = g_list_next (anchors))
{
GimpAnchor *anchor = anchors->data;
/* skip the first anchor, will add it at the end if needed */
if (! anchors->prev)
continue;
switch (anchor->type)
{
case GIMP_ANCHOR_ANCHOR:
if (anchors->prev == stroke->anchors && ! first_stroke)
points[i].type = GIMP_VECTORS_COMPAT_NEW_STROKE;
else
points[i].type = GIMP_VECTORS_COMPAT_ANCHOR;
break;
case GIMP_ANCHOR_CONTROL:
points[i].type = GIMP_VECTORS_COMPAT_CONTROL;
break;
}
points[i].x = anchor->position.x;
points[i].y = anchor->position.y;
i++;
/* write the skipped control point */
if (! anchors->next && stroke->closed)
{
anchor = GIMP_ANCHOR (stroke->anchors->data);
points[i].type = GIMP_VECTORS_COMPAT_CONTROL;
points[i].x = anchor->position.x;
points[i].y = anchor->position.y;
i++;
}
}
first_stroke = FALSE;
}
return points;
}