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77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*
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* \brief Functor for converting pixel formats by applying dithering
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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 _DITHER_PAINTER_H_
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#define _DITHER_PAINTER_H_
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#include <util/dither_matrix.h>
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#include <os/surface.h>
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struct Dither_painter
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{
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/*
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* Surface and texture must have the same size
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*/
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template <typename DST_PT, typename SRC_PT>
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static inline void paint(Genode::Surface<DST_PT> &surface,
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Genode::Texture<SRC_PT> const &texture)
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{
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if (surface.size() != texture.size()) return;
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if (!texture.pixel() || !texture.alpha()) return;
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Genode::Surface_base::Rect const clipped = surface.clip();
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if (!clipped.valid()) return;
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unsigned const offset = surface.size().w()*clipped.y1() + clipped.x1();
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DST_PT *dst, *dst_line = surface.addr() + offset;
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SRC_PT const *src_pixel, *src_pixel_line = texture.pixel() + offset;
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unsigned char const *src_alpha, *src_alpha_line = texture.alpha() + offset;
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unsigned const line_len = surface.size().w();
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for (int y = clipped.y1(), h = clipped.h() ; h--; y++) {
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src_pixel = src_pixel_line;
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src_alpha = src_alpha_line;
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dst = dst_line;
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for (int x = clipped.x1(), w = clipped.w(); w--; x++) {
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int const v = Genode::Dither_matrix::value(x, y) >> 4;
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SRC_PT const pixel = *src_pixel++;
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unsigned char const alpha = *src_alpha++;
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int const r = pixel.r() - v;
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int const g = pixel.g() - v;
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int const b = pixel.b() - v;
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int const a = alpha ? (int)alpha - v : 0;
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using Genode::min;
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using Genode::max;
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*dst++ = DST_PT(max(0, r), max(0, g), max(0, b), max(0, a));
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}
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src_pixel_line += line_len;
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src_alpha_line += line_len;
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dst_line += line_len;
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}
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}
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};
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#endif /* _DITHER_PAINTER_H_ */
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