1 files changed, 93 insertions, 0 deletions
diff --git a/app/vectors/gimpvectors-preview.c b/app/vectors/gimpvectors-preview.c
new file mode 100644
index 0000000..988148a
--- /dev/null
+++ b/app/vectors/gimpvectors-preview.c
@@ -0,0 +1,93 @@
+/* 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 <string.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "vectors-types.h"
+
+#include "libgimpmath/gimpmath.h"
+
+#include "core/gimpimage.h"
+#include "core/gimptempbuf.h"
+
+#include "gimpstroke.h"
+#include "gimpvectors.h"
+#include "gimpvectors-preview.h"
+
+
+/*  public functions  */
+
+GimpTempBuf *
+gimp_vectors_get_new_preview (GimpViewable *viewable,
+                              GimpContext  *context,
+                              gint          width,
+                              gint          height)
+{
+  GimpVectors *vectors;
+  GimpItem    *item;
+  GimpStroke  *cur_stroke;
+  gdouble      xscale, yscale;
+  guchar      *data;
+  GimpTempBuf *temp_buf;
+
+  vectors = GIMP_VECTORS (viewable);
+  item    = GIMP_ITEM (viewable);
+
+  xscale = ((gdouble) width)  / gimp_image_get_width  (gimp_item_get_image (item));
+  yscale = ((gdouble) height) / gimp_image_get_height (gimp_item_get_image (item));
+
+  temp_buf = gimp_temp_buf_new (width, height, babl_format ("Y' u8"));
+  data = gimp_temp_buf_get_data (temp_buf);
+  memset (data, 255, width * height);
+
+  for (cur_stroke = gimp_vectors_stroke_get_next (vectors, NULL);
+       cur_stroke;
+       cur_stroke = gimp_vectors_stroke_get_next (vectors, cur_stroke))
+    {
+      GArray   *coords;
+      gboolean  closed;
+      gint      i;
+
+      coords = gimp_stroke_interpolate (cur_stroke, 0.5, &closed);
+
+      if (coords)
+        {
+          for (i = 0; i < coords->len; i++)
+            {
+              GimpCoords point;
+              gint       x, y;
+
+              point = g_array_index (coords, GimpCoords, i);
+
+              x = ROUND (point.x * xscale);
+              y = ROUND (point.y * yscale);
+
+              if (x >= 0 && y >= 0 && x < width && y < height)
+                data[y * width + x] = 0;
+            }
+
+          g_array_free (coords, TRUE);
+        }
+    }
+
+  return temp_buf;
+}