genesys: Add file with class forward declarations

backend/Makefile.am

@@ -493,6 +493,7 @@ libgenesys_la_SOURCES = genesys/genesys.cpp genesys/genesys.h \
     genesys/device.h genesys/device.cpp \
     genesys/enums.h \
     genesys/error.h genesys/error.cpp \
+    genesys/fwd.h \
     genesys/gl646.cpp genesys/gl646.h genesys/gl646_registers.h \
     genesys/gl124.cpp genesys/gl124.h genesys/gl124_registers.h \
     genesys/gl841.cpp genesys/gl841.h genesys/gl841_registers.h \

backend/genesys/command_set.h

@@ -45,11 +45,11 @@
 #define BACKEND_GENESYS_COMMAND_SET_H
 
 #include "device.h"
+#include "fwd.h"
 #include <cstdint>
 
 namespace genesys {
 
-class Genesys_Device;
 
 /** Scanner command set description.
 

backend/genesys/fwd.h

@@ -0,0 +1,129 @@
+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   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., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+#ifndef BACKEND_GENESYS_FWD_H
+#define BACKEND_GENESYS_FWD_H
+
+namespace genesys {
+
+// buffer.h
+struct Genesys_Buffer;
+
+// calibration.h
+struct Genesys_Calibration_Cache;
+
+// command_set.h
+class CommandSet;
+
+// device.h
+class FixedFloat;
+struct Genesys_Gpo;
+struct MethodResolutions;
+struct Genesys_Model;
+struct Genesys_Device;
+
+// error.h
+class DebugMessageHelper;
+class SaneException;
+
+// genesys.h
+class GenesysButton;
+struct Genesys_Scanner;
+
+// image.h
+class Image;
+
+// image_buffer.h
+class ImageBuffer;
+class FakeBufferModel;
+class ImageBufferGenesysUsb;
+
+// image_pipeline.h
+class ImagePipelineNode;
+// ImagePipelineNode* skipped
+class ImagePipelineStack;
+
+// image_pixel.h
+struct Pixel;
+struct RawPixel;
+
+// low.h
+struct Genesys_USB_Device_Entry;
+struct Motor_Profile;
+
+// motor.h
+struct Genesys_Motor;
+struct Genesys_Motor_Slope;
+
+// register.h
+class Genesys_Register_Set;
+struct GenesysRegister;
+struct GenesysRegisterSetState;
+
+// row_buffer.h
+class RowBuffer;
+
+// sanei.h
+class UsbDevice;
+
+// scanner_interface.h
+class ScannerInterface;
+class ScannerInterfaceUsb;
+class TestScannerInterface;
+
+// sensor.h
+class ResolutionFilter;
+struct GenesysFrontendLayout;
+struct Genesys_Frontend;
+struct SensorExposure;
+struct SensorProfile;
+struct Genesys_Sensor;
+
+// settings.h
+struct Genesys_Settings;
+struct SetupParams;
+struct ScanSession;
+
+} // namespace genesys
+
+#endif

backend/genesys/low.h

@@ -84,6 +84,7 @@
 #include "device.h"
 #include "enums.h"
 #include "error.h"
+#include "fwd.h"
 #include "sanei.h"
 #include "sensor.h"
 #include "serialize.h"
@@ -209,10 +210,6 @@
 
 namespace genesys {
 
-/* Forward typedefs */
-struct Genesys_Scanner;
-typedef struct Genesys_Calibration_Cache  Genesys_Calibration_Cache;
-
 struct Genesys_USB_Device_Entry {
 
     Genesys_USB_Device_Entry(unsigned v, unsigned p, const Genesys_Model& m) :