/usr/include/agg2/util/agg_color_conv_rgb16.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.
//----------------------------------------------------------------------------
//
// This part of the library has been sponsored by
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
//----------------------------------------------------------------------------
//
// 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());
//----------------------------------------------------------------------------
#ifndef AGG_COLOR_CONV_RGB16_INCLUDED
#define AGG_COLOR_CONV_RGB16_INCLUDED
#include "agg_basics.h"
#include "agg_color_conv.h"
namespace agg
{
//-------------------------------------------------color_conv_gray16_to_gray8
class color_conv_gray16_to_gray8
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
int16u* s = (int16u*)src;
do
{
*dst++ = *s++ >> 8;
}
while(--width);
}
};
//-----------------------------------------------------color_conv_rgb24_rgb48
template<int I1, int I3> class color_conv_rgb24_rgb48
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
int16u* d = (int16u*)dst;
do
{
*d++ = (src[I1] << 8) | src[I1];
*d++ = (src[1] << 8) | src[1] ;
*d++ = (src[I3] << 8) | src[I3];
src += 3;
}
while(--width);
}
};
typedef color_conv_rgb24_rgb48<0,2> color_conv_rgb24_to_rgb48;
typedef color_conv_rgb24_rgb48<0,2> color_conv_bgr24_to_bgr48;
typedef color_conv_rgb24_rgb48<2,0> color_conv_rgb24_to_bgr48;
typedef color_conv_rgb24_rgb48<2,0> color_conv_bgr24_to_rgb48;
//-----------------------------------------------------color_conv_rgb24_rgb48
template<int I1, int I3> class color_conv_rgb48_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
const int16u* s = (const int16u*)src;
do
{
*dst++ = s[I1] >> 8;
*dst++ = s[1] >> 8;
*dst++ = s[I3] >> 8;
s += 3;
}
while(--width);
}
};
typedef color_conv_rgb48_rgb24<0,2> color_conv_rgb48_to_rgb24;
typedef color_conv_rgb48_rgb24<0,2> color_conv_bgr48_to_bgr24;
typedef color_conv_rgb48_rgb24<2,0> color_conv_rgb48_to_bgr24;
typedef color_conv_rgb48_rgb24<2,0> color_conv_bgr48_to_rgb24;
//----------------------------------------------color_conv_rgbAAA_rgb24
template<int R, int B> class color_conv_rgbAAA_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
int32u rgb = *(int32u*)src;
dst[R] = int8u(rgb >> 22);
dst[1] = int8u(rgb >> 12);
dst[B] = int8u(rgb >> 2);
src += 4;
dst += 3;
}
while(--width);
}
};
typedef color_conv_rgbAAA_rgb24<0,2> color_conv_rgbAAA_to_rgb24;
typedef color_conv_rgbAAA_rgb24<2,0> color_conv_rgbAAA_to_bgr24;
typedef color_conv_rgbAAA_rgb24<2,0> color_conv_bgrAAA_to_rgb24;
typedef color_conv_rgbAAA_rgb24<0,2> color_conv_bgrAAA_to_bgr24;
//----------------------------------------------color_conv_rgbBBA_rgb24
template<int R, int B> class color_conv_rgbBBA_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
int32u rgb = *(int32u*)src;
dst[R] = int8u(rgb >> 24);
dst[1] = int8u(rgb >> 13);
dst[B] = int8u(rgb >> 2);
src += 4;
dst += 3;
}
while(--width);
}
};
typedef color_conv_rgbBBA_rgb24<0,2> color_conv_rgbBBA_to_rgb24;
typedef color_conv_rgbBBA_rgb24<2,0> color_conv_rgbBBA_to_bgr24;
//----------------------------------------------color_conv_bgrABB_rgb24
template<int B, int R> class color_conv_bgrABB_rgb24
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
int32u bgr = *(int32u*)src;
dst[R] = int8u(bgr >> 3);
dst[1] = int8u(bgr >> 14);
dst[B] = int8u(bgr >> 24);
src += 4;
dst += 3;
}
while(--width);
}
};
typedef color_conv_bgrABB_rgb24<2,0> color_conv_bgrABB_to_rgb24;
typedef color_conv_bgrABB_rgb24<0,2> color_conv_bgrABB_to_bgr24;
//-------------------------------------------------color_conv_rgba64_rgba32
template<int I1, int I2, int I3, int I4> class color_conv_rgba64_rgba32
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
do
{
*dst++ = int8u(((int16u*)src)[I1] >> 8);
*dst++ = int8u(((int16u*)src)[I2] >> 8);
*dst++ = int8u(((int16u*)src)[I3] >> 8);
*dst++ = int8u(((int16u*)src)[I4] >> 8);
src += 8;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgba64_rgba32<0,1,2,3> color_conv_rgba64_to_rgba32; //----color_conv_rgba64_to_rgba32
typedef color_conv_rgba64_rgba32<0,1,2,3> color_conv_argb64_to_argb32; //----color_conv_argb64_to_argb32
typedef color_conv_rgba64_rgba32<0,1,2,3> color_conv_bgra64_to_bgra32; //----color_conv_bgra64_to_bgra32
typedef color_conv_rgba64_rgba32<0,1,2,3> color_conv_abgr64_to_abgr32; //----color_conv_abgr64_to_abgr32
typedef color_conv_rgba64_rgba32<0,3,2,1> color_conv_argb64_to_abgr32; //----color_conv_argb64_to_abgr32
typedef color_conv_rgba64_rgba32<3,2,1,0> color_conv_argb64_to_bgra32; //----color_conv_argb64_to_bgra32
typedef color_conv_rgba64_rgba32<1,2,3,0> color_conv_argb64_to_rgba32; //----color_conv_argb64_to_rgba32
typedef color_conv_rgba64_rgba32<3,0,1,2> color_conv_bgra64_to_abgr32; //----color_conv_bgra64_to_abgr32
typedef color_conv_rgba64_rgba32<3,2,1,0> color_conv_bgra64_to_argb32; //----color_conv_bgra64_to_argb32
typedef color_conv_rgba64_rgba32<2,1,0,3> color_conv_bgra64_to_rgba32; //----color_conv_bgra64_to_rgba32
typedef color_conv_rgba64_rgba32<3,2,1,0> color_conv_rgba64_to_abgr32; //----color_conv_rgba64_to_abgr32
typedef color_conv_rgba64_rgba32<3,0,1,2> color_conv_rgba64_to_argb32; //----color_conv_rgba64_to_argb32
typedef color_conv_rgba64_rgba32<2,1,0,3> color_conv_rgba64_to_bgra32; //----color_conv_rgba64_to_bgra32
typedef color_conv_rgba64_rgba32<0,3,2,1> color_conv_abgr64_to_argb32; //----color_conv_abgr64_to_argb32
typedef color_conv_rgba64_rgba32<1,2,3,0> color_conv_abgr64_to_bgra32; //----color_conv_abgr64_to_bgra32
typedef color_conv_rgba64_rgba32<3,2,1,0> color_conv_abgr64_to_rgba32; //----color_conv_abgr64_to_rgba32
//--------------------------------------------color_conv_rgb24_rgba64
template<int I1, int I2, int I3, int A> class color_conv_rgb24_rgba64
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
int16u* d = (int16u*)dst;
do
{
d[I1] = (src[0] << 8) | src[0];
d[I2] = (src[1] << 8) | src[1];
d[I3] = (src[2] << 8) | src[2];
d[A] = 65535;
d += 4;
src += 3;
}
while(--width);
}
};
//------------------------------------------------------------------------
typedef color_conv_rgb24_rgba64<1,2,3,0> color_conv_rgb24_to_argb64; //----color_conv_rgb24_to_argb64
typedef color_conv_rgb24_rgba64<3,2,1,0> color_conv_rgb24_to_abgr64; //----color_conv_rgb24_to_abgr64
typedef color_conv_rgb24_rgba64<2,1,0,3> color_conv_rgb24_to_bgra64; //----color_conv_rgb24_to_bgra64
typedef color_conv_rgb24_rgba64<0,1,2,3> color_conv_rgb24_to_rgba64; //----color_conv_rgb24_to_rgba64
typedef color_conv_rgb24_rgba64<3,2,1,0> color_conv_bgr24_to_argb64; //----color_conv_bgr24_to_argb64
typedef color_conv_rgb24_rgba64<1,2,3,0> color_conv_bgr24_to_abgr64; //----color_conv_bgr24_to_abgr64
typedef color_conv_rgb24_rgba64<0,1,2,3> color_conv_bgr24_to_bgra64; //----color_conv_bgr24_to_bgra64
typedef color_conv_rgb24_rgba64<2,1,0,3> color_conv_bgr24_to_rgba64; //----color_conv_bgr24_to_rgba64
template<int R, int B> class color_conv_rgb24_gray16
{
public:
void operator () (int8u* dst,
const int8u* src,
unsigned width) const
{
int16u* d = (int16u*)dst;
do
{
*d++ = src[R]*77 + src[1]*150 + src[B]*29;
src += 3;
}
while(--width);
}
};
typedef color_conv_rgb24_gray16<0,2> color_conv_rgb24_to_gray16;
typedef color_conv_rgb24_gray16<2,0> color_conv_bgr24_to_gray16;
}
#endif
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