genode/os/include/nitpicker_gfx/pixel_rgb565.h
2013-01-10 21:44:47 +01:00

57 lines
1.4 KiB
C++

/*
* \brief Template specializations for the RGB565 pixel format
* \date 2006-08-04
* \author Norman Feske
*/
/*
* Copyright (C) 2006-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__NITPICKER_GFX__PIXEL_RGB565_H_
#define _INCLUDE__NITPICKER_GFX__PIXEL_RGB565_H_
#include "pixel_rgb.h"
typedef Pixel_rgb<unsigned short, 0xf800, 8, 0x07e0, 3, 0x001f, -3> Pixel_rgb565;
template <>
inline Pixel_rgb565 Pixel_rgb565::avr(Pixel_rgb565 p1, Pixel_rgb565 p2)
{
Pixel_rgb565 res;
res.pixel = ((p1.pixel&0xf7df)>>1) + ((p2.pixel&0xf7df)>>1);
return res;
}
template <>
inline Pixel_rgb565 Pixel_rgb565::blend(Pixel_rgb565 src, int alpha)
{
Pixel_rgb565 res;
res.pixel = ((((alpha >> 3) * (src.pixel & 0xf81f)) >> 5) & 0xf81f)
| ((( alpha * (src.pixel & 0x07c0)) >> 8) & 0x07c0);
return res;
}
template <>
inline Pixel_rgb565 Pixel_rgb565::mix(Pixel_rgb565 p1, Pixel_rgb565 p2, int alpha)
{
Pixel_rgb res;
/*
* We substract the alpha from 264 instead of 255 to
* compensate the brightness loss caused by the rounding
* error of the blend function when having only 5 bits
* per channel.
*/
res.pixel = blend(p1, 264 - alpha).pixel + blend(p2, alpha).pixel;
return res;
}
#endif /* _INCLUDE__NITPICKER_GFX__PIXEL_RGB565_H_ */