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-rw-r--r--app/paint/gimppaintcore-stroke.c388
1 files changed, 388 insertions, 0 deletions
diff --git a/app/paint/gimppaintcore-stroke.c b/app/paint/gimppaintcore-stroke.c
new file mode 100644
index 0000000..3beac93
--- /dev/null
+++ b/app/paint/gimppaintcore-stroke.c
@@ -0,0 +1,388 @@
+/* GIMP - The GNU 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 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "paint-types.h"
+
+#include "core/gimpboundary.h"
+#include "core/gimpdrawable.h"
+#include "core/gimperror.h"
+#include "core/gimpcoords.h"
+
+#include "vectors/gimpstroke.h"
+#include "vectors/gimpvectors.h"
+
+#include "gimppaintcore.h"
+#include "gimppaintcore-stroke.h"
+#include "gimppaintoptions.h"
+
+#include "gimp-intl.h"
+
+
+static void gimp_paint_core_stroke_emulate_dynamics (GimpCoords *coords,
+ gint length);
+
+
+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,
+ gboolean push_undo,
+ GError **error)
+{
+ 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);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+ if (gimp_paint_core_start (core, drawable, paint_options, &strokes[0],
+ error))
+ {
+ gint i;
+
+ 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++)
+ {
+ gimp_paint_core_interpolate (core, drawable, paint_options,
+ &strokes[i], 0);
+ }
+
+ gimp_paint_core_paint (core, drawable, paint_options,
+ GIMP_PAINT_STATE_FINISH, 0);
+
+ gimp_paint_core_finish (core, drawable, push_undo);
+
+ gimp_paint_core_cleanup (core);
+
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+gboolean
+gimp_paint_core_stroke_boundary (GimpPaintCore *core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ gboolean emulate_dynamics,
+ const GimpBoundSeg *bound_segs,
+ gint n_bound_segs,
+ gint offset_x,
+ gint offset_y,
+ gboolean push_undo,
+ GError **error)
+{
+ GimpBoundSeg *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);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+ stroke_segs = gimp_boundary_sort (bound_segs, n_bound_segs,
+ &n_stroke_segs);
+
+ if (n_stroke_segs == 0)
+ return TRUE;
+
+ gimp_item_get_offset (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 (emulate_dynamics)
+ gimp_paint_core_stroke_emulate_dynamics (coords, n_coords);
+
+ if (initialized ||
+ gimp_paint_core_start (core, drawable, paint_options, &coords[0],
+ error))
+ {
+ gint i;
+
+ initialized = TRUE;
+
+ core->cur_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++)
+ {
+ gimp_paint_core_interpolate (core, drawable, paint_options,
+ &coords[i], 0);
+ }
+
+ gimp_paint_core_paint (core, drawable, paint_options,
+ GIMP_PAINT_STATE_FINISH, 0);
+ }
+ else
+ {
+ break;
+ }
+
+ 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, push_undo);
+
+ gimp_paint_core_cleanup (core);
+ }
+
+ g_free (coords);
+ g_free (stroke_segs);
+
+ return initialized;
+}
+
+gboolean
+gimp_paint_core_stroke_vectors (GimpPaintCore *core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ gboolean emulate_dynamics,
+ GimpVectors *vectors,
+ gboolean push_undo,
+ GError **error)
+{
+ GList *stroke;
+ gboolean initialized = FALSE;
+ gboolean due_to_lack_of_points = FALSE;
+ 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);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+ gimp_item_get_offset (GIMP_ITEM (vectors), &vectors_off_x, &vectors_off_y);
+ gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
+
+ off_x -= vectors_off_x;
+ off_y -= vectors_off_y;
+
+ for (stroke = vectors->strokes->head;
+ stroke;
+ stroke = stroke->next)
+ {
+ GArray *coords;
+ gboolean closed;
+
+ 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 (emulate_dynamics)
+ gimp_paint_core_stroke_emulate_dynamics ((GimpCoords *) coords->data,
+ coords->len);
+
+ if (initialized ||
+ gimp_paint_core_start (core, drawable, paint_options,
+ &g_array_index (coords, GimpCoords, 0),
+ error))
+ {
+ initialized = TRUE;
+
+ core->cur_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++)
+ {
+ gimp_paint_core_interpolate (core, drawable, paint_options,
+ &g_array_index (coords, GimpCoords, i),
+ 0);
+ }
+
+ gimp_paint_core_paint (core, drawable, paint_options,
+ GIMP_PAINT_STATE_FINISH, 0);
+ }
+ else
+ {
+ if (coords)
+ g_array_free (coords, TRUE);
+
+ break;
+ }
+ }
+ else
+ {
+ due_to_lack_of_points = TRUE;
+ }
+
+ if (coords)
+ g_array_free (coords, TRUE);
+ }
+
+ if (initialized)
+ {
+ gimp_paint_core_finish (core, drawable, push_undo);
+
+ gimp_paint_core_cleanup (core);
+ }
+
+ if (! initialized && due_to_lack_of_points && *error == NULL)
+ {
+ g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
+ _("Not enough points to stroke"));
+ }
+
+ return initialized;
+}
+
+static void
+gimp_paint_core_stroke_emulate_dynamics (GimpCoords *coords,
+ gint length)
+{
+ const gint ramp_length = length / 3;
+
+ /* Calculate and create pressure ramp parameters */
+ if (ramp_length > 0)
+ {
+ gdouble slope = 1.0 / (gdouble) (ramp_length);
+ gint i;
+
+ /* Calculate pressure start ramp */
+ for (i = 0; i < ramp_length; i++)
+ {
+ coords[i].pressure = i * slope;
+ }
+
+ /* Calculate pressure end ramp */
+ for (i = length - ramp_length; i < length; i++)
+ {
+ coords[i].pressure = 1.0 - (i - (length - ramp_length)) * slope;
+ }
+ }
+
+ /* Calculate and create velocity ramp parameters */
+ if (length > 0)
+ {
+ gdouble slope = 1.0 / length;
+ gint i;
+
+ /* Calculate velocity end ramp */
+ for (i = 0; i < length; i++)
+ {
+ coords[i].velocity = i * slope;
+ }
+ }
+
+ if (length > 1)
+ {
+ gint i;
+ /* Fill in direction */
+ for (i = 1; i < length; i++)
+ {
+ coords[i].direction = gimp_coords_direction (&coords[i-1], &coords[i]);
+ }
+
+ coords[0].direction = coords[1].direction;
+ }
+}
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