78 lines
1.5 KiB
C++
78 lines
1.5 KiB
C++
/*
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* \brief Functor for drawing a horizonatal shadow onto a surface
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* \author Norman Feske
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* \date 2005-10-24
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*/
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/*
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* Copyright (C) 2006-2013 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__SCOUT_GFX__HORIZONTAL_SHADOW_PAINTER_H_
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#define _INCLUDE__SCOUT_GFX__HORIZONTAL_SHADOW_PAINTER_H_
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#include <os/surface.h>
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struct Horizontal_shadow_painter
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{
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typedef Genode::Surface_base::Rect Rect;
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template <typename PT>
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static inline void paint(Genode::Surface<PT> &surface, Rect rect,
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int intensity)
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{
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PT *addr = surface.addr();
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if (!addr) return;
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const int cx1 = surface.clip().x1();
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const int cy1 = surface.clip().y1();
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const int cx2 = surface.clip().x2();
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const int cy2 = surface.clip().y2();
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int x = rect.x1();
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int y = rect.y1();
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int w = rect.w();
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int h = rect.h();
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int curr_a = intensity;
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int step = rect.h() ? (curr_a/rect.h()) : 0;
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if (x < cx1) {
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w -= cx1 - x;
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x = cx1;
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}
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if (y < cy1) {
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h -= cy1 - y;
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curr_a -= (cy1 - y)*step;
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y = cy1;
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}
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if (w > cx2 - x + 1)
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w = cx2 - x + 1;
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if (h > cy2 - y + 1)
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h = cy2 - y + 1;
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addr += surface.size().w()*y + x;
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PT shadow_color(0,0,0);
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for (int j = 0; j < h; j++, addr += surface.size().w()) {
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PT *d = addr;
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for (int i = 0; i < w; i++, d++)
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*d = PT::mix(*d, shadow_color, curr_a);
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curr_a -= step;
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}
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}
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};
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#endif /* _INCLUDE__SCOUT_GFX__HORIZONTAL_SHADOW_PAINTER_H_ */
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