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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
*/
#ifndef __BASE_PIXEL_HH__
#define __BASE_PIXEL_HH__
#include <cmath>
#include <cstdint>
#include <string>
#include <vector>
#include "base/compiler.hh"
#include "base/cprintf.hh"
#include "base/str.hh"
#include "base/types.hh"
/**
* Internal gem5 representation of a Pixel.
*/
struct Pixel
{
Pixel()
: red(0), green(0), blue(0), padding(0) {}
Pixel(uint8_t _red, uint8_t _green, uint8_t _blue)
: red(_red), green(_green), blue(_blue), padding(0) {}
uint8_t red;
uint8_t green;
uint8_t blue;
uint8_t padding;
};
inline bool
operator==(const Pixel &lhs, const Pixel &rhs)
{
return lhs.red == rhs.red &&
lhs.green == rhs.green &&
lhs.blue == rhs.blue &&
lhs.padding == rhs.padding;
}
/**
* Configurable RGB pixel converter.
*
* This class converts between external RGB representations and gem5's
* internal Pixel representation. The class assumes that pixels are
* stored in a word of configurable length (up to 32 bits). Individual
* pixels are assumed to be represented by contiguous bit ranges in
* the word (i.e., it is possible to shift and mask out a contiguous
* bit range for each pixel).
*/
class PixelConverter
{
public:
/**
* Color channel conversion and scaling helper class.
*/
struct Channel {
/**
* @param offset Offset in bits.
* @param width Width in bits.
*/
Channel(unsigned offset, unsigned width);
/**
* Get the value of a single color channel represented as an
* 8-bit number.
*/
uint8_t toPixel(uint32_t word) const {
return round(((word >> offset) & mask) * factor);
}
/**
* Convert an 8-bit representation of a color into an external
* format.
*/
uint32_t fromPixel(uint8_t ch) const {
return (static_cast<uint8_t>(round(ch / factor)) & mask) << offset;
}
/** Offset in bits */
unsigned offset;
/** Bit mask (after shifting) */
unsigned mask;
/**
* Scaling factor when converting to the full range of an
* 8-bit color channel
*/
float factor;
};
PixelConverter(unsigned length,
unsigned ro, unsigned go, unsigned bo,
unsigned rw, unsigned gw, unsigned bw,
ByteOrder byte_order = LittleEndianByteOrder);
/** Get the Pixel representation of a color word. */
Pixel toPixel(uint32_t word) const {
return Pixel(ch_r.toPixel(word),
ch_g.toPixel(word),
ch_b.toPixel(word));
}
/** Get a Pixel representation by reading a word from memory. */
Pixel toPixel(const uint8_t *rfb) const {
return toPixel(readWord(rfb));
}
/** Convert a Pixel into a color word */
uint32_t fromPixel(const Pixel &pixel) const {
return ch_r.fromPixel(pixel.red) |
ch_g.fromPixel(pixel.green) |
ch_b.fromPixel(pixel.blue);
}
/**
* Convert a pixel into a color word and store the resulting word
* in memory.
*/
void fromPixel(uint8_t *rfb, const Pixel &pixel) const {
writeWord(rfb, fromPixel(pixel));
}
/**
* Read a word of a given length and endianness from memory.
*
* The number of bytes read from memory is determined by the
* length of a color word. Note that some of the bytes may be
* padding.
*
* @param p Pointer to the first byte in the word.
* @return Word in host endianness.
*/
uint32_t readWord(const uint8_t *p) const;
/**
* Write a word of a given length and endianness to memory.
*
* @param p Pointer to the first byte in memory.
* @param word Word to store (host endianness).
*/
void writeWord(uint8_t *p, uint32_t word) const;
/** Bytes per pixel when stored in memory (including padding) */
unsigned length;
/**
* Number of bits used to represent one pixel value (excluding
* padding). This could be less than length * 8 if the pixel value
* is padded.
*/
unsigned depth;
/** Byte order when stored to memory. */
ByteOrder byte_order;
/** Red channel conversion helper */
Channel ch_r;
/** Green channel conversion helper */
Channel ch_g;
/** Blue channel conversion helper */
Channel ch_b;
/** Predefined 32-bit RGB (red in least significant bits, 8
* bits/channel, little endian) conversion helper */
static const PixelConverter rgba8888_le;
/** Predefined 16-bit RGB565 (red in least significant bits,
* little endian) conversion helper */
static const PixelConverter rgb565_le;
/** Predefined 32-bit RGB (red in least significant bits, 8
* bits/channel, big endian) conversion helper */
static const PixelConverter rgba8888_be;
/** Predefined 16-bit RGB565 (red in least significant bits,
* big endian) conversion helper */
static const PixelConverter rgb565_be;
};
inline bool
to_number(const std::string &value, Pixel &retval)
{
uint32_t num;
if (!to_number(value, num))
return false;
retval = PixelConverter::rgba8888_le.toPixel(num);
return true;
}
inline std::ostream &
operator<<(std::ostream &os, const Pixel &pxl)
{
os << csprintf("%#.08x", PixelConverter::rgba8888_le.fromPixel(pxl));
return os;
}
#endif // __BASE_PIXEL_HH__
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