Consolidate "bedlevel" code

Marlin/src/feature/bedlevel/abl/abl.h

@@ -0,0 +1,51 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef __ABL_H__
+#define __ABL_H__
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(AUTO_BED_LEVELING_BILINEAR)
+
+  #include "../bedlevel.h"
+
+  extern int bilinear_grid_spacing[2], bilinear_start[2];
+  extern float bilinear_grid_factor[2],
+               z_values[GRID_MAX_POINTS_X][GRID_MAX_POINTS_Y];
+  float bilinear_z_offset(const float logical[XYZ]);
+
+  void extrapolate_unprobed_bed_level();
+  void print_bilinear_leveling_grid();
+  void refresh_bed_level();
+  #if ENABLED(ABL_BILINEAR_SUBDIVISION)
+    void print_bilinear_leveling_grid_virt();
+    void bed_level_virt_interpolate();
+  #endif
+
+  #if !IS_KINEMATIC
+    void bilinear_line_to_destination(const float fr_mm_s, uint16_t x_splits=0xFFFF, uint16_t y_splits=0xFFFF);
+  #endif
+
+#endif // AUTO_BED_LEVELING_BILINEAR
+
+#endif // __ABL_H__