74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/*
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* \brief Functor for tinting a surface with a color
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* \author Norman Feske
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* \date 2015-11-13
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*/
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/*
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* Copyright (C) 2015 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 _TINT_PAINTER_H_
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#define _TINT_PAINTER_H_
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#include <os/surface.h>
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#include <polygon_gfx/interpolate_rgba.h>
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struct Tint_painter
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{
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typedef Genode::Surface_base::Rect Rect;
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/**
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* Tint box with specified color
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*
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* \param rect position and size of box to tint
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* \param color tinting color
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*/
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template <typename PT>
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static inline void paint(Genode::Surface<PT> surface,
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Rect rect,
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Genode::Color color)
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{
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Rect clipped = Rect::intersect(surface.clip(), rect);
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if (!clipped.valid()) return;
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/*
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* Generate lookup table (LUT) for mapping brightness values to colors.
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* The specified color is used as a fixed point within the LUT. The
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* other values are interpolated from black over the color to white.
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*/
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enum { LUT_SIZE = 256*3 };
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PT pixel_lut[LUT_SIZE];
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unsigned char alpha_lut[LUT_SIZE];
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unsigned const lut_idx = color.r + color.g + color.b;
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Polygon::interpolate_rgba(Polygon::Color(0, 0, 0), color,
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pixel_lut, alpha_lut,
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lut_idx + 1, 0, 0);
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Polygon::interpolate_rgba(color, Polygon::Color(255, 255, 255),
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pixel_lut + lut_idx, alpha_lut + lut_idx,
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LUT_SIZE - lut_idx, 0, 0);
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PT pix(color.r, color.g, color.b);
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PT *dst, *dst_line = surface.addr() + surface.size().w()*clipped.y1() + clipped.x1();
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for (int w, h = clipped.h() ; h--; dst_line += surface.size().w())
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for (dst = dst_line, w = clipped.w(); w--; dst++) {
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PT const pixel = *dst;
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*dst = pixel_lut[pixel.r() + pixel.g() + pixel.b()];
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}
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surface.flush_pixels(clipped);
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}
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};
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#endif /* _INCLUDE__NITPICKER_GFX__BOX_PAINTER_H_ */
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