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/*
* Copyright (c) 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
*/
#include "base/pixel.hh"
#include <cassert>
#include "base/bitfield.hh"
const PixelConverter PixelConverter::rgba8888_le(4, 0, 8, 16, 8, 8, 8);
const PixelConverter PixelConverter::rgba8888_be(4, 0, 8, 16, 8, 8, 8,
BigEndianByteOrder);
const PixelConverter PixelConverter::rgb565_le(2, 0, 5, 11, 5, 6, 5);
const PixelConverter PixelConverter::rgb565_be(2, 0, 5, 11, 5, 6, 5,
BigEndianByteOrder);
PixelConverter::PixelConverter(unsigned _length,
unsigned ro, unsigned go, unsigned bo,
unsigned rw, unsigned gw, unsigned bw,
ByteOrder _byte_order)
: length(_length),
depth(rw + gw + bw),
byte_order(_byte_order),
ch_r(ro, rw),
ch_g(go, gw),
ch_b(bo, bw)
{
assert(length > 1);
}
PixelConverter::Channel::Channel(unsigned _offset, unsigned width)
: offset(_offset),
mask(::mask(width)),
factor(255.0 / mask)
{
}
uint32_t
PixelConverter::readWord(const uint8_t *p) const
{
uint32_t word(0);
if (byte_order == LittleEndianByteOrder) {
for (int i = 0; i < length; ++i)
word |= p[i] << (8 * i);
} else {
for (int i = 0; i < length; ++i)
word |= p[i] << (8 * (length - i - 1));
}
return word;
}
void
PixelConverter::writeWord(uint8_t *p, uint32_t word) const
{
if (byte_order == LittleEndianByteOrder) {
for (int i = 0; i < length; ++i)
p[i] = (word >> (8 * i)) & 0xFF;
} else {
for (int i = 0; i < length; ++i)
p[i] = (word >> (8 * (length - i - 1))) & 0xFF;
}
}
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