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os: define ALPHA8 pixel format

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This commit is contained in:
Norman Feske 2014-09-09 09:18:48 +02:00
parent a7fa0ccd06
commit b01c74ae12
2 changed files with 40 additions and 1 deletions
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39
repos/os/include/os/pixel_alpha8.h Normal file
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@ -0,0 +1,39 @@
/*
* \brief Template specializations for the ALPHA8 pixel format
* \author Norman Feske
* \date 2014-09-10
*/
/*
* Copyright (C) 2014 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__OS__PIXEL_ALPHA8_H_
#define _INCLUDE__OS__PIXEL_ALPHA8_H_
#include <os/pixel_rgba.h>
namespace Genode {
typedef Genode::Pixel_rgba<unsigned char, Genode::Surface_base::ALPHA8,
0, 0, 0, 0, 0, 0, 0xff, 0>
Pixel_alpha8;
/*
* The second pixel parameter is ignored. It can be of any pixel type.
*/
template <>
template <typename PT>
inline Pixel_alpha8 Pixel_alpha8::mix(Pixel_alpha8 p1, PT, int alpha)
{
Pixel_alpha8 res;
res.pixel = p1.pixel + (((255 - p1.pixel)*alpha) >> 8);
return res;
}
}
#endif /* _INCLUDE__OS__PIXEL_ALPHA8_H_ */

2
repos/os/include/os/surface.h
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@ -37,7 +37,7 @@ class Genode::Surface_base
typedef Genode::Rect<> Rect;
typedef Genode::Color Color;
enum Pixel_format { UNKNOWN, RGB565, RGB888 };
enum Pixel_format { UNKNOWN, RGB565, RGB888, ALPHA8 };
struct Flusher
{