Laurent Pinchart
8daf20485b
Extend the ControlValue class with a reserve() function to set the value without actually copying data, and a non-const data() function that allows writing data directly to the ControlValue storage. This allows allocating memory directly in ControlValue, potentially removing a data copy. Note that this change was implemented before ByteStreamBuffer gained the zero-copy read() variant, and doesn't actually save a copy in the control serializer. It however still simplifies ControlSerializer::loadControlValue(). Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* control_serializer.h - Control (de)serializer
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*/
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#ifndef __LIBCAMERA_CONTROL_SERIALIZER_H__
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#define __LIBCAMERA_CONTROL_SERIALIZER_H__
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#include <map>
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#include <memory>
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#include <vector>
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#include <libcamera/controls.h>
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namespace libcamera {
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class ByteStreamBuffer;
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class ControlSerializer
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{
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public:
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ControlSerializer();
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void reset();
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static size_t binarySize(const ControlInfoMap &infoMap);
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static size_t binarySize(const ControlList &list);
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int serialize(const ControlInfoMap &infoMap, ByteStreamBuffer &buffer);
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int serialize(const ControlList &list, ByteStreamBuffer &buffer);
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template<typename T>
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T deserialize(ByteStreamBuffer &buffer);
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private:
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static size_t binarySize(const ControlValue &value);
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static size_t binarySize(const ControlInfo &info);
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static void store(const ControlValue &value, ByteStreamBuffer &buffer);
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static void store(const ControlInfo &info, ByteStreamBuffer &buffer);
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ControlValue loadControlValue(ControlType type, ByteStreamBuffer &buffer,
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bool isArray = false, unsigned int count = 1);
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ControlInfo loadControlInfo(ControlType type, ByteStreamBuffer &buffer);
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unsigned int serial_;
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std::vector<std::unique_ptr<ControlId>> controlIds_;
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std::map<unsigned int, ControlInfoMap> infoMaps_;
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std::map<const ControlInfoMap *, unsigned int> infoMapHandles_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_CONTROL_SERIALIZER_H__ */
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