gimp/app/paint/gimppaintcore-stroke.c

/* 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 <glib-object.h>

#include "paint-types.h"

#include "base/boundary.h"

#include "core/gimpdrawable.h"

#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"

#include "gimppaintcore.h"
#include "gimppaintcore-stroke.h"
#include "gimppaintoptions.h"


static const GimpCoords default_coords = GIMP_COORDS_DEFAULT_VALUES;


gboolean
gimp_paint_core_stroke (GimpPaintCore    *core,
                        GimpDrawable     *drawable,
                        GimpPaintOptions *paint_options,
                        GimpCoords       *strokes,
                        gint              n_strokes)
{
  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (strokes != NULL, FALSE);
  g_return_val_if_fail (n_strokes > 0, FALSE);

  if (gimp_paint_core_start (core, drawable, paint_options, &strokes[0]))
    {
      gint i;

      core->start_coords = strokes[0];
      core->last_coords  = strokes[0];

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_INIT, 0);

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_MOTION, 0);

      for (i = 1; i < n_strokes; i++)
        {
          core->cur_coords = strokes[i];

          gimp_paint_core_interpolate (core, drawable, paint_options, 0);
        }

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_FINISH, 0);

      gimp_paint_core_finish (core, drawable);

      gimp_paint_core_cleanup (core);

      return TRUE;
    }

  return FALSE;
}

gboolean
gimp_paint_core_stroke_boundary (GimpPaintCore    *core,
                                 GimpDrawable     *drawable,
                                 GimpPaintOptions *paint_options,
                                 const BoundSeg   *bound_segs,
                                 gint              n_bound_segs,
                                 gint              offset_x,
                                 gint              offset_y)
{
  GimpImage  *image;
  BoundSeg   *stroke_segs;
  gint        n_stroke_segs;
  gint        off_x;
  gint        off_y;
  GimpCoords *coords;
  gboolean    initialized = FALSE;
  gint        n_coords;
  gint        seg;
  gint        s;

  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (bound_segs != NULL && n_bound_segs > 0, FALSE);

  image = gimp_item_get_image (GIMP_ITEM (drawable));

  stroke_segs = boundary_sort (bound_segs, n_bound_segs, &n_stroke_segs);

  if (n_stroke_segs == 0)
    return TRUE;

  gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);

  off_x -= offset_x;
  off_y -= offset_y;

  coords = g_new0 (GimpCoords, n_bound_segs + 4);

  seg      = 0;
  n_coords = 0;

  /* we offset all coordinates by 0.5 to align the brush with the path */

  coords[n_coords]   = default_coords;
  coords[n_coords].x = (gdouble) (stroke_segs[0].x1 - off_x + 0.5);
  coords[n_coords].y = (gdouble) (stroke_segs[0].y1 - off_y + 0.5);

  n_coords++;

  for (s = 0; s < n_stroke_segs; s++)
    {
      while (stroke_segs[seg].x1 != -1 ||
             stroke_segs[seg].x2 != -1 ||
             stroke_segs[seg].y1 != -1 ||
             stroke_segs[seg].y2 != -1)
        {
          coords[n_coords]   = default_coords;
          coords[n_coords].x = (gdouble) (stroke_segs[seg].x1 - off_x + 0.5);
          coords[n_coords].y = (gdouble) (stroke_segs[seg].y1 - off_y + 0.5);

          n_coords++;
          seg++;
        }

      /* Close the stroke points up */
      coords[n_coords] = coords[0];

      n_coords++;

      if (initialized ||
          gimp_paint_core_start (core, drawable, paint_options, &coords[0]))
        {
          gint i;

          initialized = TRUE;

          core->start_coords = coords[0];
          core->last_coords  = coords[0];

          gimp_paint_core_paint (core, drawable, paint_options,
                                 GIMP_PAINT_STATE_INIT, 0);

          gimp_paint_core_paint (core, drawable, paint_options,
                                 GIMP_PAINT_STATE_MOTION, 0);

          for (i = 1; i < n_coords; i++)
            {
              core->cur_coords = coords[i];

              gimp_paint_core_interpolate (core, drawable, paint_options, 0);
            }

          gimp_paint_core_paint (core, drawable, paint_options,
                                 GIMP_PAINT_STATE_FINISH, 0);
        }

      n_coords = 0;
      seg++;

      coords[n_coords]   = default_coords;
      coords[n_coords].x = (gdouble) (stroke_segs[seg].x1 - off_x + 0.5);
      coords[n_coords].y = (gdouble) (stroke_segs[seg].y1 - off_y + 0.5);

      n_coords++;
    }

  if (initialized)
    {
      gimp_paint_core_finish (core, drawable);

      gimp_paint_core_cleanup (core);
    }

  g_free (coords);
  g_free (stroke_segs);

  return TRUE;
}

gboolean
gimp_paint_core_stroke_vectors (GimpPaintCore    *core,
                                GimpDrawable     *drawable,
                                GimpPaintOptions *paint_options,
                                GimpVectors      *vectors)
{
  GList      *stroke;
  GArray     *coords      = NULL;
  gboolean    initialized = FALSE;
  gboolean    closed;
  gint        off_x, off_y;
  gint        vectors_off_x, vectors_off_y;

  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);

  gimp_item_offsets (GIMP_ITEM (vectors),  &vectors_off_x, &vectors_off_y);
  gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);

  off_x -= vectors_off_x;
  off_y -= vectors_off_y;

  for (stroke = vectors->strokes; stroke; stroke = stroke->next)
    {
      coords = gimp_stroke_interpolate (GIMP_STROKE (stroke->data),
                                        1.0, &closed);

      if (coords && coords->len)
        {
          gint i;

          for (i = 0; i < coords->len; i++)
            {
              g_array_index (coords, GimpCoords, i).x -= off_x;
              g_array_index (coords, GimpCoords, i).y -= off_y;
            }

          if (initialized ||
              gimp_paint_core_start (core, drawable, paint_options,
                                     &g_array_index (coords, GimpCoords, 0)))
            {
              initialized = TRUE;

              core->start_coords = g_array_index (coords, GimpCoords, 0);
              core->last_coords  = g_array_index (coords, GimpCoords, 0);

              gimp_paint_core_paint (core, drawable, paint_options,
                                     GIMP_PAINT_STATE_INIT, 0);

              gimp_paint_core_paint (core, drawable, paint_options,
                                     GIMP_PAINT_STATE_MOTION, 0);

              for (i = 1; i < coords->len; i++)
                {
                  core->cur_coords = g_array_index (coords, GimpCoords, i);

                  gimp_paint_core_interpolate (core, drawable, paint_options, 0);
                }

              gimp_paint_core_paint (core, drawable, paint_options,
                                     GIMP_PAINT_STATE_FINISH, 0);
            }
        }

      if (coords)
        g_array_free (coords, TRUE);
    }

  if (initialized)
    {
      gimp_paint_core_finish (core, drawable);

      gimp_paint_core_cleanup (core);
    }

  return TRUE;
}