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47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
/*
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* \brief Template specializations for the ALPHA8 pixel format
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* \author Norman Feske
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* \date 2014-09-10
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__OS__PIXEL_ALPHA8_H_
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#define _INCLUDE__OS__PIXEL_ALPHA8_H_
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#include <os/pixel_rgba.h>
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namespace Genode {
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using Pixel_alpha8 = Pixel_rgba<uint8_t, Surface_base::ALPHA8,
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0, 0, 0, 0, 0, 0, 0xff, 0>;
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using Pixel_input8 = Pixel_rgba<uint8_t, Surface_base::INPUT8,
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0, 0, 0, 0, 0, 0, 0xff, 0>;
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/*
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* The second pixel parameter is ignored. It can be of any pixel type.
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*/
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template <>
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template <typename PT>
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inline Pixel_alpha8 Pixel_alpha8::mix(Pixel_alpha8 p1, PT, int alpha)
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{
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Pixel_alpha8 res;
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res.pixel = (uint8_t)(p1.pixel + (((255 - p1.pixel)*alpha) >> 8));
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return res;
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}
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template <>
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inline Pixel_alpha8 Pixel_alpha8::mix(Pixel_alpha8 p1, Pixel_alpha8 p2, int alpha)
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{
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return mix<Pixel_alpha8>(p1, p2, alpha);
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}
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}
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#endif /* _INCLUDE__OS__PIXEL_ALPHA8_H_ */
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