/usr/include/agg2/util/agg_color_conv_rgb8.h is in libagg-dev 2.5+dfsg1-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Anti-Grain Geometry (AGG) - Version 2.5
// A high quality rendering engine for C++
// Copyright (C) 2002-2006 Maxim Shemanarev
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://antigrain.com
//
// AGG 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.
//
// AGG 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 AGG; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301, USA.
//----------------------------------------------------------------------------
//
// A set of functors used with color_conv(). See file agg_color_conv.h
// These functors can convert images with up to 8 bits per component.
// Use convertors in the following way:
//
// agg::color_conv(dst, src, agg::color_conv_XXXX_to_YYYY());
// whare XXXX and YYYY can be any of:
// rgb24
// bgr24
// rgba32
// abgr32
// argb32
// bgra32
// rgb555
// rgb565
//----------------------------------------------------------------------------
#ifndef AGG_COLOR_CONV_RGB8_INCLUDED
#define AGG_COLOR_CONV_RGB8_INCLUDED
#include "agg_basics.h"
#include "agg_color_conv.h"
namespace agg
{
//-----------------------------------------------------color_conv_rgb24
class color_conv_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*dst++ = src[2];
*dst++ = src[1];
*dst++ = src[0];
src += 3;
}
while(--width);
}
};
typedef color_conv_rgb24 color_conv_rgb24_to_bgr24;
typedef color_conv_rgb24 color_conv_bgr24_to_rgb24;
typedef color_conv_same<3> color_conv_bgr24_to_bgr24;
typedef color_conv_same<3> color_conv_rgb24_to_rgb24;
//------------------------------------------------------color_conv_rgba32
template<int I1, int I2, int I3, int I4> class color_conv_rgba32
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*dst++ = src[I1];
*dst++ = src[I2];
*dst++ = src[I3];
*dst++ = src[I4];
src += 4;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgba32<0,3,2,1> color_conv_argb32_to_abgr32; //----color_conv_argb32_to_abgr32
typedef color_conv_rgba32<3,2,1,0> color_conv_argb32_to_bgra32; //----color_conv_argb32_to_bgra32
typedef color_conv_rgba32<1,2,3,0> color_conv_argb32_to_rgba32; //----color_conv_argb32_to_rgba32
typedef color_conv_rgba32<3,0,1,2> color_conv_bgra32_to_abgr32; //----color_conv_bgra32_to_abgr32
typedef color_conv_rgba32<3,2,1,0> color_conv_bgra32_to_argb32; //----color_conv_bgra32_to_argb32
typedef color_conv_rgba32<2,1,0,3> color_conv_bgra32_to_rgba32; //----color_conv_bgra32_to_rgba32
typedef color_conv_rgba32<3,2,1,0> color_conv_rgba32_to_abgr32; //----color_conv_rgba32_to_abgr32
typedef color_conv_rgba32<3,0,1,2> color_conv_rgba32_to_argb32; //----color_conv_rgba32_to_argb32
typedef color_conv_rgba32<2,1,0,3> color_conv_rgba32_to_bgra32; //----color_conv_rgba32_to_bgra32
typedef color_conv_rgba32<0,3,2,1> color_conv_abgr32_to_argb32; //----color_conv_abgr32_to_argb32
typedef color_conv_rgba32<1,2,3,0> color_conv_abgr32_to_bgra32; //----color_conv_abgr32_to_bgra32
typedef color_conv_rgba32<3,2,1,0> color_conv_abgr32_to_rgba32; //----color_conv_abgr32_to_rgba32
//------------------------------------------------------------------------
typedef color_conv_same<4> color_conv_rgba32_to_rgba32; //----color_conv_rgba32_to_rgba32
typedef color_conv_same<4> color_conv_argb32_to_argb32; //----color_conv_argb32_to_argb32
typedef color_conv_same<4> color_conv_bgra32_to_bgra32; //----color_conv_bgra32_to_bgra32
typedef color_conv_same<4> color_conv_abgr32_to_abgr32; //----color_conv_abgr32_to_abgr32
//--------------------------------------------color_conv_rgb24_rgba32
template<int I1, int I2, int I3, int A> class color_conv_rgb24_rgba32
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
dst[I1] = *src++;
dst[I2] = *src++;
dst[I3] = *src++;
dst[A] = 255;
dst += 4;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb24_rgba32<1,2,3,0> color_conv_rgb24_to_argb32; //----color_conv_rgb24_to_argb32
typedef color_conv_rgb24_rgba32<3,2,1,0> color_conv_rgb24_to_abgr32; //----color_conv_rgb24_to_abgr32
typedef color_conv_rgb24_rgba32<2,1,0,3> color_conv_rgb24_to_bgra32; //----color_conv_rgb24_to_bgra32
typedef color_conv_rgb24_rgba32<0,1,2,3> color_conv_rgb24_to_rgba32; //----color_conv_rgb24_to_rgba32
typedef color_conv_rgb24_rgba32<3,2,1,0> color_conv_bgr24_to_argb32; //----color_conv_bgr24_to_argb32
typedef color_conv_rgb24_rgba32<1,2,3,0> color_conv_bgr24_to_abgr32; //----color_conv_bgr24_to_abgr32
typedef color_conv_rgb24_rgba32<0,1,2,3> color_conv_bgr24_to_bgra32; //----color_conv_bgr24_to_bgra32
typedef color_conv_rgb24_rgba32<2,1,0,3> color_conv_bgr24_to_rgba32; //----color_conv_bgr24_to_rgba32
//-------------------------------------------------color_conv_rgba32_rgb24
template<int I1, int I2, int I3> class color_conv_rgba32_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*dst++ = src[I1];
*dst++ = src[I2];
*dst++ = src[I3];
src += 4;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgba32_rgb24<1,2,3> color_conv_argb32_to_rgb24; //----color_conv_argb32_to_rgb24
typedef color_conv_rgba32_rgb24<3,2,1> color_conv_abgr32_to_rgb24; //----color_conv_abgr32_to_rgb24
typedef color_conv_rgba32_rgb24<2,1,0> color_conv_bgra32_to_rgb24; //----color_conv_bgra32_to_rgb24
typedef color_conv_rgba32_rgb24<0,1,2> color_conv_rgba32_to_rgb24; //----color_conv_rgba32_to_rgb24
typedef color_conv_rgba32_rgb24<3,2,1> color_conv_argb32_to_bgr24; //----color_conv_argb32_to_bgr24
typedef color_conv_rgba32_rgb24<1,2,3> color_conv_abgr32_to_bgr24; //----color_conv_abgr32_to_bgr24
typedef color_conv_rgba32_rgb24<0,1,2> color_conv_bgra32_to_bgr24; //----color_conv_bgra32_to_bgr24
typedef color_conv_rgba32_rgb24<2,1,0> color_conv_rgba32_to_bgr24; //----color_conv_rgba32_to_bgr24
//------------------------------------------------color_conv_rgb555_rgb24
template<int R, int B> class color_conv_rgb555_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
unsigned rgb = *(int16u*)src;
dst[R] = (int8u)((rgb >> 7) & 0xF8);
dst[1] = (int8u)((rgb >> 2) & 0xF8);
dst[B] = (int8u)((rgb << 3) & 0xF8);
src += 2;
dst += 3;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb555_rgb24<2,0> color_conv_rgb555_to_bgr24; //----color_conv_rgb555_to_bgr24
typedef color_conv_rgb555_rgb24<0,2> color_conv_rgb555_to_rgb24; //----color_conv_rgb555_to_rgb24
//-------------------------------------------------color_conv_rgb24_rgb555
template<int R, int B> class color_conv_rgb24_rgb555
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*(int16u*)dst = (int16u)(((unsigned(src[R]) << 7) & 0x7C00) |
((unsigned(src[1]) << 2) & 0x3E0) |
((unsigned(src[B]) >> 3)));
src += 3;
dst += 2;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb24_rgb555<2,0> color_conv_bgr24_to_rgb555; //----color_conv_bgr24_to_rgb555
typedef color_conv_rgb24_rgb555<0,2> color_conv_rgb24_to_rgb555; //----color_conv_rgb24_to_rgb555
//-------------------------------------------------color_conv_rgb565_rgb24
template<int R, int B> class color_conv_rgb565_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
unsigned rgb = *(int16u*)src;
dst[R] = (rgb >> 8) & 0xF8;
dst[1] = (rgb >> 3) & 0xFC;
dst[B] = (rgb << 3) & 0xF8;
src += 2;
dst += 3;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb565_rgb24<2,0> color_conv_rgb565_to_bgr24; //----color_conv_rgb565_to_bgr24
typedef color_conv_rgb565_rgb24<0,2> color_conv_rgb565_to_rgb24; //----color_conv_rgb565_to_rgb24
//-------------------------------------------------color_conv_rgb24_rgb565
template<int R, int B> class color_conv_rgb24_rgb565
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*(int16u*)dst = (int16u)(((unsigned(src[R]) << 8) & 0xF800) |
((unsigned(src[1]) << 3) & 0x7E0) |
((unsigned(src[B]) >> 3)));
src += 3;
dst += 2;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb24_rgb565<2,0> color_conv_bgr24_to_rgb565; //----color_conv_bgr24_to_rgb565
typedef color_conv_rgb24_rgb565<0,2> color_conv_rgb24_to_rgb565; //----color_conv_rgb24_to_rgb565
//-------------------------------------------------color_conv_rgb555_rgba32
template<int R, int G, int B, int A> class color_conv_rgb555_rgba32
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
int rgb = *(int16*)src;
dst[R] = (int8u)((rgb >> 7) & 0xF8);
dst[G] = (int8u)((rgb >> 2) & 0xF8);
dst[B] = (int8u)((rgb << 3) & 0xF8);
dst[A] = (int8u)(rgb >> 15);
src += 2;
dst += 4;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb555_rgba32<1,2,3,0> color_conv_rgb555_to_argb32; //----color_conv_rgb555_to_argb32
typedef color_conv_rgb555_rgba32<3,2,1,0> color_conv_rgb555_to_abgr32; //----color_conv_rgb555_to_abgr32
typedef color_conv_rgb555_rgba32<2,1,0,3> color_conv_rgb555_to_bgra32; //----color_conv_rgb555_to_bgra32
typedef color_conv_rgb555_rgba32<0,1,2,3> color_conv_rgb555_to_rgba32; //----color_conv_rgb555_to_rgba32
//------------------------------------------------color_conv_rgba32_rgb555
template<int R, int G, int B, int A> class color_conv_rgba32_rgb555
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*(int16u*)dst = (int16u)(((unsigned(src[R]) << 7) & 0x7C00) |
((unsigned(src[G]) << 2) & 0x3E0) |
((unsigned(src[B]) >> 3)) |
((unsigned(src[A]) << 8) & 0x8000));
src += 4;
dst += 2;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgba32_rgb555<1,2,3,0> color_conv_argb32_to_rgb555; //----color_conv_argb32_to_rgb555
typedef color_conv_rgba32_rgb555<3,2,1,0> color_conv_abgr32_to_rgb555; //----color_conv_abgr32_to_rgb555
typedef color_conv_rgba32_rgb555<2,1,0,3> color_conv_bgra32_to_rgb555; //----color_conv_bgra32_to_rgb555
typedef color_conv_rgba32_rgb555<0,1,2,3> color_conv_rgba32_to_rgb555; //----color_conv_rgba32_to_rgb555
//------------------------------------------------color_conv_rgb565_rgba32
template<int R, int G, int B, int A> class color_conv_rgb565_rgba32
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
int rgb = *(int16*)src;
dst[R] = (rgb >> 8) & 0xF8;
dst[G] = (rgb >> 3) & 0xFC;
dst[B] = (rgb << 3) & 0xF8;
dst[A] = 255;
src += 2;
dst += 4;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb565_rgba32<1,2,3,0> color_conv_rgb565_to_argb32; //----color_conv_rgb565_to_argb32
typedef color_conv_rgb565_rgba32<3,2,1,0> color_conv_rgb565_to_abgr32; //----color_conv_rgb565_to_abgr32
typedef color_conv_rgb565_rgba32<2,1,0,3> color_conv_rgb565_to_bgra32; //----color_conv_rgb565_to_bgra32
typedef color_conv_rgb565_rgba32<0,1,2,3> color_conv_rgb565_to_rgba32; //----color_conv_rgb565_to_rgba32
//------------------------------------------------color_conv_rgba32_rgb565
template<int R, int G, int B> class color_conv_rgba32_rgb565
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*(int16u*)dst = (int16u)(((unsigned(src[R]) << 8) & 0xF800) |
((unsigned(src[G]) << 3) & 0x7E0) |
((unsigned(src[B]) >> 3)));
src += 4;
dst += 2;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgba32_rgb565<1,2,3> color_conv_argb32_to_rgb565; //----color_conv_argb32_to_rgb565
typedef color_conv_rgba32_rgb565<3,2,1> color_conv_abgr32_to_rgb565; //----color_conv_abgr32_to_rgb565
typedef color_conv_rgba32_rgb565<2,1,0> color_conv_bgra32_to_rgb565; //----color_conv_bgra32_to_rgb565
typedef color_conv_rgba32_rgb565<0,1,2> color_conv_rgba32_to_rgb565; //----color_conv_rgba32_to_rgb565
//---------------------------------------------color_conv_rgb555_to_rgb565
class color_conv_rgb555_to_rgb565
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
unsigned rgb = *(int16u*)src;
*(int16u*)dst = (int16u)(((rgb << 1) & 0xFFC0) | (rgb & 0x1F));
src += 2;
dst += 2;
}
while(--width);
}
};
//----------------------------------------------color_conv_rgb565_to_rgb555
class color_conv_rgb565_to_rgb555
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
unsigned rgb = *(int16u*)src;
*(int16u*)dst = (int16u)(((rgb >> 1) & 0x7FE0) | (rgb & 0x1F));
src += 2;
dst += 2;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_same<2> color_conv_rgb555_to_rgb555; //----color_conv_rgb555_to_rgb555
typedef color_conv_same<2> color_conv_rgb565_to_rgb565; //----color_conv_rgb565_to_rgb565
template<int R, int B> class color_conv_rgb24_gray8
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*dst++ = (src[R]*77 + src[1]*150 + src[B]*29) >> 8;
src += 3;
}
while(--width);
}
};
typedef color_conv_rgb24_gray8<0,2> color_conv_rgb24_to_gray8; //----color_conv_rgb24_to_gray8
typedef color_conv_rgb24_gray8<2,0> color_conv_bgr24_to_gray8; //----color_conv_bgr24_to_gray8
}
#endif
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