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diff --git a/source/blender/io/gpencil/intern/gpencil_io_base.h b/source/blender/io/gpencil/intern/gpencil_io_base.h
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+++ b/source/blender/io/gpencil/intern/gpencil_io_base.h
@@ -0,0 +1,116 @@
+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation
+ * All rights reserved.
+ */
+#pragma once
+
+/** \file
+ * \ingroup bgpencil
+ */
+
+#include "BLI_float2.hh"
+#include "BLI_float3.hh"
+#include "BLI_float4x4.hh"
+#include "BLI_vector.hh"
+
+#include "DNA_space_types.h" /* for FILE_MAX */
+
+#include "gpencil_io.h"
+
+struct Depsgraph;
+struct Main;
+struct Object;
+struct RegionView3D;
+struct Scene;
+
+struct bGPdata;
+struct bGPDlayer;
+struct bGPDstroke;
+
+using blender::Vector;
+
+namespace blender::io::gpencil {
+
+class GpencilIO {
+ public:
+  GpencilIO(const GpencilIOParams *iparams);
+
+  void frame_number_set(const int value);
+
+ protected:
+  GpencilIOParams params_;
+
+  bool invert_axis_[2];
+  float4x4 diff_mat_;
+  char filename_[FILE_MAX];
+
+  /* Used for sorting objects. */
+  struct ObjectZ {
+    float zdepth;
+    struct Object *ob;
+  };
+
+  /** List of included objects. */
+  blender::Vector<ObjectZ> ob_list_;
+
+  /* Data for easy access. */
+  struct Depsgraph *depsgraph_;
+  struct bGPdata *gpd_;
+  struct Main *bmain_;
+  struct Scene *scene_;
+  struct RegionView3D *rv3d_;
+
+  int16_t winx_, winy_;
+  int16_t render_x_, render_y_;
+  float camera_ratio_;
+  rctf camera_rect_;
+
+  float2 offset_;
+
+  int cfra_;
+
+  float stroke_color_[4], fill_color_[4];
+
+  /* Geometry functions. */
+  bool gpencil_3D_point_to_screen_space(const float3 co, float2 &r_co);
+  float2 gpencil_3D_point_to_render_space(const float3 co);
+  float2 gpencil_3D_point_to_2D(const float3 co);
+
+  float stroke_point_radius_get(struct bGPDlayer *gpl, struct bGPDstroke *gps);
+  void create_object_list();
+
+  bool is_camera_mode();
+
+  float stroke_average_opacity_get();
+
+  void prepare_layer_export_matrix(struct Object *ob, struct bGPDlayer *gpl);
+  void prepare_stroke_export_colors(struct Object *ob, struct bGPDstroke *gps);
+
+  void selected_objects_boundbox_calc();
+  void selected_objects_boundbox_get(rctf *boundbox);
+  void filename_set(const char *filename);
+
+ private:
+  float avg_opacity_;
+  bool is_camera_;
+  rctf select_boundbox_;
+
+  /* Camera matrix. */
+  float persmat_[4][4];
+};
+
+}  // namespace blender::io::gpencil