1 files changed, 79 insertions, 0 deletions
diff --git a/app/gegl/gimp-gegl-tile-compat.c b/app/gegl/gimp-gegl-tile-compat.c
new file mode 100644
index 0000000..54d917c
--- /dev/null
+++ b/app/gegl/gimp-gegl-tile-compat.c
@@ -0,0 +1,79 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-gegl-tile-compat.h
+ * Copyright (C) 2012 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "gimp-gegl-types.h"
+
+#include "gimp-gegl-tile-compat.h"
+
+
+gint
+gimp_gegl_buffer_get_n_tile_rows (GeglBuffer *buffer,
+                                  gint        tile_height)
+{
+  return (gegl_buffer_get_height (buffer) + tile_height - 1) / tile_height;
+}
+
+gint
+gimp_gegl_buffer_get_n_tile_cols (GeglBuffer *buffer,
+                                  gint        tile_width)
+{
+  return (gegl_buffer_get_width (buffer) + tile_width - 1) / tile_width;
+}
+
+gboolean
+gimp_gegl_buffer_get_tile_rect (GeglBuffer    *buffer,
+                                gint           tile_width,
+                                gint           tile_height,
+                                gint           tile_num,
+                                GeglRectangle *rect)
+{
+  gint n_tile_rows;
+  gint n_tile_columns;
+  gint tile_row;
+  gint tile_column;
+
+  n_tile_rows    = gimp_gegl_buffer_get_n_tile_rows (buffer, tile_height);
+  n_tile_columns = gimp_gegl_buffer_get_n_tile_cols (buffer, tile_width);
+
+  if (tile_num > n_tile_rows * n_tile_columns - 1)
+    return FALSE;
+
+  tile_row    = tile_num / n_tile_columns;
+  tile_column = tile_num % n_tile_columns;
+
+  rect->x = tile_column * tile_width;
+  rect->y = tile_row    * tile_height;
+
+  if (tile_column == n_tile_columns - 1)
+    rect->width = gegl_buffer_get_width (buffer) - rect->x;
+  else
+    rect->width = tile_width;
+
+  if (tile_row == n_tile_rows - 1)
+    rect->height = gegl_buffer_get_height (buffer) - rect->y;
+  else
+    rect->height = tile_height;
+
+  return TRUE;
+}