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64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/*
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* \brief Template specializations for the RGB565 pixel format
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* \date 2006-08-04
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* \author Norman Feske
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*/
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/*
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* Copyright (C) 2006-2017 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_RGB565_H_
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#define _INCLUDE__OS__PIXEL_RGB565_H_
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#include <os/pixel_rgba.h>
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namespace Genode {
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typedef Pixel_rgba<uint16_t, Surface_base::RGB565,
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0xf800, 8, 0x07e0, 3, 0x001f, -3, 0, 0>
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Pixel_rgb565;
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template <>
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inline Pixel_rgb565 Pixel_rgb565::avr(Pixel_rgb565 p1, Pixel_rgb565 p2)
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{
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Pixel_rgb565 res;
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res.pixel = (uint16_t)(((p1.pixel&0xf7df)>>1) +
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((p2.pixel&0xf7df)>>1));
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return res;
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}
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template <>
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inline Pixel_rgb565 Pixel_rgb565::blend(Pixel_rgb565 src, int alpha)
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{
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Pixel_rgb565 res;
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res.pixel = (uint16_t)(((((alpha >> 3) * (src.pixel & 0xf81f)) >> 5) & 0xf81f) |
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((( alpha * (src.pixel & 0x07c0)) >> 8) & 0x07c0));
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return res;
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}
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template <>
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inline Pixel_rgb565 Pixel_rgb565::mix(Pixel_rgb565 p1, Pixel_rgb565 p2, int alpha)
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{
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Pixel_rgb565 res;
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/*
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* We substract the alpha from 264 instead of 255 to
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* compensate the brightness loss caused by the rounding
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* error of the blend function when having only 5 bits
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* per channel.
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*/
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res.pixel = (uint16_t)(blend(p1, 264 - alpha).pixel +
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blend(p2, alpha).pixel);
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return res;
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}
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}
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#endif /* _INCLUDE__OS__PIXEL_RGB565_H_ */
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