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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2011 D. R. Commander. All Rights Reserved.
* Copyright 2009-2022 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// PixelFormat - structure to represent a pixel format. Also has useful
// methods for reading & writing to streams, etc. Conversion to and from
// other formats are also handled by this class. We have three different
// representations that we refer to:
//
// a) Pixels - Unsigned native integers in the format specified by this
// PixelFormat object.
// b) Buffer - Same thing as pixels, but in the appropriate byte stream
// format. This involves endian conversion and padding.
// c) RGB - A byte stream of 8 bit red, green and blue elements, in that
// order.
//
#ifndef __RFB_PIXELFORMAT_H__
#define __RFB_PIXELFORMAT_H__
#include <rfb/Pixel.h>
namespace rdr { class InStream; class OutStream; }
namespace rfb {
class PixelFormat {
public:
PixelFormat(int b, int d, bool e, bool t,
int rm, int gm, int bm, int rs, int gs, int bs);
PixelFormat();
// Checks if the formats have identical buffer representation.
// They might still have different pixel representation, endianness
// or true colour state.
bool operator==(const PixelFormat& other) const;
bool operator!=(const PixelFormat& other) const;
void read(rdr::InStream* is);
void write(rdr::OutStream* os) const;
bool is888(void) const;
bool isBigEndian(void) const;
bool isLittleEndian(void) const;
inline Pixel pixelFromBuffer(const uint8_t* buffer) const;
inline void bufferFromPixel(uint8_t* buffer, Pixel pixel) const;
inline Pixel pixelFromRGB(uint16_t red, uint16_t green, uint16_t blue) const;
inline Pixel pixelFromRGB(uint8_t red, uint8_t green, uint8_t blue) const;
void bufferFromRGB(uint8_t *dst, const uint8_t* src, int pixels) const;
void bufferFromRGB(uint8_t *dst, const uint8_t* src,
int w, int stride, int h) const;
inline void rgbFromPixel(Pixel pix, uint16_t *r, uint16_t *g, uint16_t *b) const;
inline void rgbFromPixel(Pixel pix, uint8_t *r, uint8_t *g, uint8_t *b) const;
void rgbFromBuffer(uint8_t* dst, const uint8_t* src, int pixels) const;
void rgbFromBuffer(uint8_t* dst, const uint8_t* src,
int w, int stride, int h) const;
Pixel pixelFromPixel(const PixelFormat &srcPF, Pixel src) const;
void bufferFromBuffer(uint8_t* dst, const PixelFormat &srcPF,
const uint8_t* src, int pixels) const;
void bufferFromBuffer(uint8_t* dst, const PixelFormat &srcPF,
const uint8_t* src, int w, int h,
int dstStride, int srcStride) const;
void print(char* str, int len) const;
bool parse(const char* str);
protected:
void updateState(void);
bool isSane(void);
private:
// Templated, optimised methods
template<class T>
void directBufferFromBufferFrom888(T* dst, const PixelFormat &srcPF,
const uint8_t* src, int w, int h,
int dstStride, int srcStride) const;
template<class T>
void directBufferFromBufferTo888(uint8_t* dst, const PixelFormat &srcPF,
const T* src, int w, int h,
int dstStride, int srcStride) const;
public:
int bpp;
int depth;
// This only tracks if the client thinks it is in colour map mode.
// In practice we are always in true colour mode.
bool trueColour;
protected:
bool bigEndian;
int redMax;
int greenMax;
int blueMax;
int redShift;
int greenShift;
int blueShift;
protected:
/* Pre-computed values to keep algorithms simple */
int redBits, greenBits, blueBits;
int maxBits, minBits;
bool endianMismatch;
static uint8_t upconvTable[256*8];
static uint8_t downconvTable[256*8];
class Init;
friend class Init;
static Init _init;
/* Only for testing this class */
friend void makePixel(const rfb::PixelFormat &, uint8_t *);
friend bool verifyPixel(const rfb::PixelFormat &,
const rfb::PixelFormat &,
const uint8_t *);
};
}
#include <rfb/PixelFormat.inl>
#endif
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