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/* -*- tab-width:4; indent-tabs-mode:'t c-file-style:"stroustrup" -*- */
/*
* libopenraw - unpack.cpp
*
* Copyright (C) 2008 Hubert Figuiere
* Copyright (C) 2008 Novell, Inc.
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "unpack.h"
#include "debug.h"
#include "ifd.h"
namespace OpenRaw { namespace Internals {
using namespace Debug;
Unpack::Unpack(uint32_t w, uint32_t t)
: m_w(w), m_type(t)
{
}
/* Return the size of an image row. */
size_t Unpack::block_size()
{
size_t bs;
if(m_type == IFD::COMPRESS_NIKON_PACK) {
bs = (m_w / 2 * 3) + (m_w / 10);
}
else {
bs = m_w / 2 * 3;
}
return bs;
}
/** source is in BE byte order
* the output is always 16-bits values in native (host) byte order.
* the source must correspond to an image row.
*/
size_t Unpack::unpack_be12to16(uint8_t *dest, const uint8_t *src,
size_t size)
{
uint16_t *dest16 = reinterpret_cast<uint16_t *>(dest);
size_t pad = (m_type == IFD::COMPRESS_NIKON_PACK) ? 1 : 0;
size_t n = size / (15 + pad);
size_t rest = size % (15 + pad);
size_t ret = n * 20 + rest / 3 * 4;
/* The inner loop advances 10 columns, which corresponds to 15 input
bytes, 20 output bytes and, in a Nikon pack, one padding byte.*/
if (pad) {
assert (size % 16 == 0);
}
assert (rest % 3 == 0);
for (size_t i = 0; i < n + 1; i++) {
size_t m = i == n ? rest / 3 : 5;
for(size_t j = 0; j < m; j++) {
/* Read 3 bytes */
uint32_t t = *src++;
t <<= 8;
t |= *src++;
t <<= 8;
t |= *src++;
/* Write two 16 bit values. */
*dest16 = (t & (0xfff << 12)) >> 12;
dest16++;
*dest16 = t & 0xfff;
dest16++;
}
src += pad;
}
return ret;
}
} }
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