kopia lustrzana https://gitlab.com/sane-project/backends
113 wiersze
3.6 KiB
C++
113 wiersze
3.6 KiB
C++
/* sane - Scanner Access Now Easy.
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Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
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This file is part of the SANE package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, the authors of SANE give permission for
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additional uses of the libraries contained in this release of SANE.
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The exception is that, if you link a SANE library with other files
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to produce an executable, this does not by itself cause the
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resulting executable to be covered by the GNU General Public
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License. Your use of that executable is in no way restricted on
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account of linking the SANE library code into it.
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This exception does not, however, invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License.
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If you submit changes to SANE to the maintainers to be included in
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a subsequent release, you agree by submitting the changes that
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those changes may be distributed with this exception intact.
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If you write modifications of your own for SANE, it is your choice
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whether to permit this exception to apply to your modifications.
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If you do not wish that, delete this exception notice.
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*/
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#ifndef BACKEND_GENESYS_IMAGE_BUFFER_H
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#define BACKEND_GENESYS_IMAGE_BUFFER_H
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#include "enums.h"
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#include "row_buffer.h"
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#include <algorithm>
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#include <functional>
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namespace genesys {
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// This class allows reading from row-based source in smaller or larger chunks of data
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class ImageBuffer
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{
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public:
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using ProducerCallback = std::function<bool(std::size_t size, std::uint8_t* out_data)>;
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ImageBuffer() {}
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ImageBuffer(std::size_t size, ProducerCallback producer);
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std::size_t size() const { return size_; }
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std::size_t available() const { return size_ - buffer_offset_; }
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bool get_data(std::size_t size, std::uint8_t* out_data);
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private:
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ProducerCallback producer_;
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std::size_t size_ = 0;
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std::size_t buffer_offset_ = 0;
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std::vector<std::uint8_t> buffer_;
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};
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// This class is similar to ImageBuffer, but preserves historical peculiarities of buffer handling
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// in the backend to preserve exact behavior
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class ImageBufferGenesysUsb
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{
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public:
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using ProducerCallback = std::function<void(std::size_t size, std::uint8_t* out_data)>;
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ImageBufferGenesysUsb() {}
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ImageBufferGenesysUsb(std::size_t total_size, std::size_t buffer_size,
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ProducerCallback producer);
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std::size_t remaining_size() const { return remaining_size_; }
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void set_remaining_size(std::size_t bytes) { remaining_size_ = bytes; }
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std::size_t available() const { return buffer_end_ - buffer_offset_; }
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bool get_data(std::size_t size, std::uint8_t* out_data);
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private:
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std::size_t get_read_size();
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std::size_t remaining_size_ = 0;
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std::size_t buffer_size_ = 0;
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std::size_t buffer_offset_ = 0;
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std::size_t buffer_end_ = 0;
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std::vector<std::uint8_t> buffer_;
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ProducerCallback producer_;
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};
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} // namespace genesys
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#endif // BACKEND_GENESYS_IMAGE_BUFFER_H
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