kopia lustrzana https://gitlab.com/sane-project/backends
86 wiersze
2.8 KiB
C++
86 wiersze
2.8 KiB
C++
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/* 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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#define DEBUG_DECLARE_ONLY
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#include "genesys_image_buffer.h"
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#include "genesys_image.h"
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ImageBuffer::ImageBuffer(std::size_t size, ProducerCallback producer) :
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producer_{producer},
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size_{size},
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buffer_offset_{size}
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{
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buffer_.resize(size_);
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}
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void ImageBuffer::get_data(std::size_t size, std::uint8_t* out_data)
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{
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const std::uint8_t* out_data_end = out_data + size;
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auto copy_buffer = [&]()
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{
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std::size_t bytes_copy = std::min<std::size_t>(out_data_end - out_data, available());
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std::memcpy(out_data, buffer_.data() + buffer_offset_, bytes_copy);
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out_data += bytes_copy;
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buffer_offset_ += bytes_copy;
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};
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// first, read remaining data from buffer
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if (available() > 0) {
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copy_buffer();
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}
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if (out_data == out_data_end) {
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return;
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}
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// now the buffer is empty and there's more data to be read
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do {
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buffer_offset_ = 0;
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producer_(size_, buffer_.data());
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copy_buffer();
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} while(out_data < out_data_end);
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}
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