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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
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/*
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* \brief Generic pixel representation
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* \author Norman Feske
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* \date 2006-08-04
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*/
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/*
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* Copyright (C) 2006-2011 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 General Public License version 2.
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*/
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#ifndef _INCLUDE__NITPICKER_GFX__PIXEL_RGB_H_
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#define _INCLUDE__NITPICKER_GFX__PIXEL_RGB_H_
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/*
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* \param ST storage type of one pixel
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*/
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template <typename ST, int R_MASK, int R_SHIFT,
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int G_MASK, int G_SHIFT,
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int B_MASK, int B_SHIFT>
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class Pixel_rgb
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{
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private:
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/**
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* Shift left with positive or negative shift value
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*/
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inline int _shift(int value, int shift) {
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return shift > 0 ? value << shift : value >> -shift; }
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public:
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static const int r_mask = R_MASK, r_shift = R_SHIFT;
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static const int g_mask = G_MASK, g_shift = G_SHIFT;
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static const int b_mask = B_MASK, b_shift = B_SHIFT;
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ST pixel;
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/**
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* Constructors
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*/
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Pixel_rgb() {}
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Pixel_rgb(int red, int green, int blue):
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pixel((_shift(red, r_shift) & r_mask)
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| (_shift(green, g_shift) & g_mask)
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| (_shift(blue, b_shift) & b_mask)) { }
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/**
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* Compute average color value of two pixels
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*/
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static inline Pixel_rgb avr(Pixel_rgb p1, Pixel_rgb p2);
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/**
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* Multiply pixel with alpha value
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*/
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static inline Pixel_rgb blend(Pixel_rgb pixel, int alpha);
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/**
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* Mix two pixels at the ratio specified as alpha
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*/
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static inline Pixel_rgb mix(Pixel_rgb p1, Pixel_rgb p2, int alpha);
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/**
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* Return alpha value of pixel
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*/
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int alpha();
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} __attribute__((packed));
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#endif /* _INCLUDE__NITPICKER_GFX__PIXEL_RGB_H_ */
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